cosmopolitan/third_party/lemon/lemon.c

#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived      │
│ all copyright and related or neighboring rights to this file,    │
│ as it is written in the following disclaimers:                   │
│   • http://unlicense.org/                                        │
│   • http://creativecommons.org/publicdomain/zero/1.0/            │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/alg/alg.h"
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/conv/conv.h"
#include "libc/fmt/fmt.h"
#include "libc/mem/mem.h"
#include "libc/runtime/gc.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/x/x.h"
#include "third_party/dtoa/dtoa.h"

/*
** This file contains all sources (including headers) to the LEMON
** LALR(1) parser generator.  The sources have been combined into a
** single file to make it easy to include LEMON in the source tree
** and Makefile of another program.
**
** The author of this program disclaims copyright.
*/

#define ISSPACE(X) isspace((unsigned char)(X))
#define ISDIGIT(X) isdigit((unsigned char)(X))
#define ISALNUM(X) isalnum((unsigned char)(X))
#define ISALPHA(X) isalpha((unsigned char)(X))
#define ISUPPER(X) isupper((unsigned char)(X))
#define ISLOWER(X) islower((unsigned char)(X))

#define PRIVATE static
/* #define PRIVATE */

#ifdef TEST
#define MAXRHS 5 /* Set low to exercise exception code */
#else
#define MAXRHS 1000
#endif

extern void memory_error();
static int showPrecedenceConflict = 0;
static char *msort(char *, char **, int (*)(const char *, const char *));

/*
** Compilers are getting increasingly pedantic about type conversions
** as C evolves ever closer to Ada....  To work around the latest problems
** we have to define the following variant of strlen().
*/
#define lemonStrlen(X) ((int)strlen(X))

/*
** Compilers are starting to complain about the use of sprintf() and strcpy(),
** saying they are unsafe.  So we define our own versions of those routines too.
**
** There are three routines here:  lemon_sprintf(), lemon_vsprintf(), and
** lemon_addtext(). The first two are replacements for sprintf() and vsprintf().
** The third is a helper routine for vsnprintf() that adds texts to the end of a
** buffer, making sure the buffer is always zero-terminated.
**
** The string formatter is a minimal subset of stdlib sprintf() supporting only
** a few simply conversions:
**
**   %d
**   %s
**   %.*s
**
*/
static void lemon_addtext(
    char *zBuf,      /* The buffer to which text is added */
    int *pnUsed,     /* Slots of the buffer used so far */
    const char *zIn, /* Text to add */
    int nIn,         /* Bytes of text to add.  -1 to use strlen() */
    int iWidth       /* Field width.  Negative to left justify */
) {
  if (nIn < 0)
    for (nIn = 0; zIn[nIn]; nIn++) {
    }
  while (iWidth > nIn) {
    zBuf[(*pnUsed)++] = ' ';
    iWidth--;
  }
  if (nIn == 0) return;
  memcpy(&zBuf[*pnUsed], zIn, nIn);
  *pnUsed += nIn;
  while ((-iWidth) > nIn) {
    zBuf[(*pnUsed)++] = ' ';
    iWidth++;
  }
  zBuf[*pnUsed] = 0;
}
static int lemon_vsprintf(char *str, const char *zFormat, va_list ap) {
  int i, j, k, c;
  int nUsed = 0;
  const char *z;
  char zTemp[50];
  str[0] = 0;
  for (i = j = 0; (c = zFormat[i]) != 0; i++) {
    if (c == '%') {
      int iWidth = 0;
      lemon_addtext(str, &nUsed, &zFormat[j], i - j, 0);
      c = zFormat[++i];
      if (ISDIGIT(c) || (c == '-' && ISDIGIT(zFormat[i + 1]))) {
        if (c == '-') i++;
        while (ISDIGIT(zFormat[i])) iWidth = iWidth * 10 + zFormat[i++] - '0';
        if (c == '-') iWidth = -iWidth;
        c = zFormat[i];
      }
      if (c == 'd') {
        int v = va_arg(ap, int);
        if (v < 0) {
          lemon_addtext(str, &nUsed, "-", 1, iWidth);
          v = -v;
        } else if (v == 0) {
          lemon_addtext(str, &nUsed, "0", 1, iWidth);
        }
        k = 0;
        while (v > 0) {
          k++;
          zTemp[sizeof(zTemp) - k] = (v % 10) + '0';
          v /= 10;
        }
        lemon_addtext(str, &nUsed, &zTemp[sizeof(zTemp) - k], k, iWidth);
      } else if (c == 's') {
        z = va_arg(ap, const char *);
        lemon_addtext(str, &nUsed, z, -1, iWidth);
      } else if (c == '.' && memcmp(&zFormat[i], ".*s", 3) == 0) {
        i += 2;
        k = va_arg(ap, int);
        z = va_arg(ap, const char *);
        lemon_addtext(str, &nUsed, z, k, iWidth);
      } else if (c == '%') {
        lemon_addtext(str, &nUsed, "%", 1, 0);
      } else {
        fprintf(stderr, "illegal format\n");
        exit(1);
      }
      j = i + 1;
    }
  }
  lemon_addtext(str, &nUsed, &zFormat[j], i - j, 0);
  return nUsed;
}
static int lemon_sprintf(char *str, const char *format, ...) {
  va_list ap;
  int rc;
  va_start(ap, format);
  rc = lemon_vsprintf(str, format, ap);
  va_end(ap);
  return rc;
}
static void lemon_strcpy(char *dest, const char *src) {
  while ((*(dest++) = *(src++)) != 0) {
  }
}
static void lemon_strcat(char *dest, const char *src) {
  while (*dest) dest++;
  lemon_strcpy(dest, src);
}

/* a few forward declarations... */
struct rule;
struct lemon;
struct action;

static struct action *Action_new(void);
static struct action *Action_sort(struct action *);

/********** From the file "build.h" ************************************/
void FindRulePrecedences(struct lemon *);
void FindFirstSets(struct lemon *);
void FindStates(struct lemon *);
void FindLinks(struct lemon *);
void FindFollowSets(struct lemon *);
void FindActions(struct lemon *);

/********* From the file "configlist.h" *********************************/
void Configlist_init(void);
struct config *Configlist_add(struct rule *, int);
struct config *Configlist_addbasis(struct rule *, int);
void Configlist_closure(struct lemon *);
void Configlist_sort(void);
void Configlist_sortbasis(void);
struct config *Configlist_return(void);
struct config *Configlist_basis(void);
void Configlist_eat(struct config *);
void Configlist_reset(void);

/********* From the file "error.h" ***************************************/
void ErrorMsg(const char *, int, const char *, ...);

/****** From the file "option.h" ******************************************/
enum option_type {
  OPT_FLAG = 1,
  OPT_INT,
  OPT_DBL,
  OPT_STR,
  OPT_FFLAG,
  OPT_FINT,
  OPT_FDBL,
  OPT_FSTR
};
struct s_options {
  enum option_type type;
  const char *label;
  char *arg;
  const char *message;
};
int OptInit(char **, struct s_options *, FILE *);
int OptNArgs(void);
char *OptArg(int);
void OptErr(int);
void OptPrint(void);

/******** From the file "parse.h" *****************************************/
void Parse(struct lemon *lemp);

/********* From the file "plink.h" ***************************************/
struct plink *Plink_new(void);
void Plink_add(struct plink **, struct config *);
void Plink_copy(struct plink **, struct plink *);
void Plink_delete(struct plink *);

/********** From the file "report.h" *************************************/
void Reprint(struct lemon *);
void ReportOutput(struct lemon *);
void ReportTable(struct lemon *, int, int);
void ReportHeader(struct lemon *);
void CompressTables(struct lemon *);
void ResortStates(struct lemon *);

/********** From the file "set.h" ****************************************/
void SetSize(int);            /* All sets will be of size N */
char *SetNew(void);           /* A new set for element 0..N */
void SetFree(char *);         /* Deallocate a set */
int SetAdd(char *, int);      /* Add element to a set */
int SetUnion(char *, char *); /* A <- A U B, thru element N */
#define SetFind(X, Y) (X[Y])  /* True if Y is in set X */

/********** From the file "struct.h" *************************************/
/*
** Principal data structures for the LEMON parser generator.
*/

typedef enum { LEMON_FALSE = 0, LEMON_TRUE } Boolean;

/* Symbols (terminals and nonterminals) of the grammar are stored
** in the following: */
enum symbol_type { TERMINAL, NONTERMINAL, MULTITERMINAL };
enum e_assoc { LEFT, RIGHT, NONE, UNK };
struct symbol {
  const char *name;        /* Name of the symbol */
  int index;               /* Index number for this symbol */
  enum symbol_type type;   /* Symbols are all either TERMINALS or NTs */
  struct rule *rule;       /* Linked list of rules of this (if an NT) */
  struct symbol *fallback; /* fallback token in case this token doesn't parse */
  int prec;                /* Precedence if defined (-1 otherwise) */
  enum e_assoc assoc;      /* Associativity if precedence is defined */
  char *firstset;          /* First-set for all rules of this symbol */
  Boolean lambda;          /* True if NT and can generate an empty string */
  int useCnt;              /* Number of times used */
  char *destructor;        /* Code which executes whenever this symbol is
                           ** popped from the stack during error processing */
  int destLineno;          /* Line number for start of destructor.  Set to
                           ** -1 for duplicate destructors. */
  char *datatype;          /* The data type of information held by this
                           ** object. Only used if type==NONTERMINAL */
  int dtnum;               /* The data type number.  In the parser, the value
                           ** stack is a union.  The .yy%d element of this
                           ** union is the correct data type for this object */
  int bContent;            /* True if this symbol ever carries content - if
                           ** it is ever more than just syntax */
  /* The following fields are used by MULTITERMINALs only */
  int nsubsym;            /* Number of constituent symbols in the MULTI */
  struct symbol **subsym; /* Array of constituent symbols */
};

/* Each production rule in the grammar is stored in the following
** structure.  */
struct rule {
  struct symbol *lhs;     /* Left-hand side of the rule */
  const char *lhsalias;   /* Alias for the LHS (NULL if none) */
  int lhsStart;           /* True if left-hand side is the start symbol */
  int ruleline;           /* Line number for the rule */
  int nrhs;               /* Number of RHS symbols */
  struct symbol **rhs;    /* The RHS symbols */
  const char **rhsalias;  /* An alias for each RHS symbol (NULL if none) */
  int line;               /* Line number at which code begins */
  const char *code;       /* The code executed when this rule is reduced */
  const char *codePrefix; /* Setup code before code[] above */
  const char *codeSuffix; /* Breakdown code after code[] above */
  struct symbol *precsym; /* Precedence symbol for this rule */
  int index;              /* An index number for this rule */
  int iRule;              /* Rule number as used in the generated tables */
  Boolean noCode;         /* True if this rule has no associated C code */
  Boolean codeEmitted;    /* True if the code has been emitted already */
  Boolean canReduce;      /* True if this rule is ever reduced */
  Boolean doesReduce;     /* Reduce actions occur after optimization */
  Boolean neverReduce;    /* Reduce is theoretically possible, but prevented
                          ** by actions or other outside implementation */
  struct rule *nextlhs;   /* Next rule with the same LHS */
  struct rule *next;      /* Next rule in the global list */
};

/* A configuration is a production rule of the grammar together with
** a mark (dot) showing how much of that rule has been processed so far.
** Configurations also contain a follow-set which is a list of terminal
** symbols which are allowed to immediately follow the end of the rule.
** Every configuration is recorded as an instance of the following: */
enum cfgstatus { COMPLETE, INCOMPLETE };
struct config {
  struct rule *rp;       /* The rule upon which the configuration is based */
  int dot;               /* The parse point */
  char *fws;             /* Follow-set for this configuration only */
  struct plink *fplp;    /* Follow-set forward propagation links */
  struct plink *bplp;    /* Follow-set backwards propagation links */
  struct state *stp;     /* Pointer to state which contains this */
  enum cfgstatus status; /* used during followset and shift computations */
  struct config *next;   /* Next configuration in the state */
  struct config *bp;     /* The next basis configuration */
};

enum e_action {
  SHIFT,
  ACCEPT,
  REDUCE,
  ERROR,
  SSCONFLICT,  /* A shift/shift conflict */
  SRCONFLICT,  /* Was a reduce, but part of a conflict */
  RRCONFLICT,  /* Was a reduce, but part of a conflict */
  SH_RESOLVED, /* Was a shift.  Precedence resolved conflict */
  RD_RESOLVED, /* Was reduce.  Precedence resolved conflict */
  NOT_USED,    /* Deleted by compression */
  SHIFTREDUCE  /* Shift first, then reduce */
};

/* Every shift or reduce operation is stored as one of the following */
struct action {
  struct symbol *sp; /* The look-ahead symbol */
  enum e_action type;
  union {
    struct state *stp; /* The new state, if a shift */
    struct rule *rp;   /* The rule, if a reduce */
  } x;
  struct symbol *spOpt;   /* SHIFTREDUCE optimization to this symbol */
  struct action *next;    /* Next action for this state */
  struct action *collide; /* Next action with the same hash */
};

/* Each state of the generated parser's finite state machine
** is encoded as an instance of the following structure. */
struct state {
  struct config *bp;     /* The basis configurations for this state */
  struct config *cfp;    /* All configurations in this set */
  int statenum;          /* Sequential number for this state */
  struct action *ap;     /* List of actions for this state */
  int nTknAct, nNtAct;   /* Number of actions on terminals and nonterminals */
  int iTknOfst, iNtOfst; /* yy_action[] offset for terminals and nonterms */
  int iDfltReduce;       /* Default action is to REDUCE by this rule */
  struct rule *pDfltReduce; /* The default REDUCE rule. */
  int autoReduce;           /* True if this is an auto-reduce state */
};
#define NO_OFFSET (-2147483647)

/* A followset propagation link indicates that the contents of one
** configuration followset should be propagated to another whenever
** the first changes. */
struct plink {
  struct config *cfp; /* The configuration to which linked */
  struct plink *next; /* The next propagate link */
};

/* The state vector for the entire parser generator is recorded as
** follows.  (LEMON uses no global variables and makes little use of
** static variables.  Fields in the following structure can be thought
** of as begin global variables in the program.) */
struct lemon {
  struct state **sorted;   /* Table of states sorted by state number */
  struct rule *rule;       /* List of all rules */
  struct rule *startRule;  /* First rule */
  int nstate;              /* Number of states */
  int nxstate;             /* nstate with tail degenerate states removed */
  int nrule;               /* Number of rules */
  int nruleWithAction;     /* Number of rules with actions */
  int nsymbol;             /* Number of terminal and nonterminal symbols */
  int nterminal;           /* Number of terminal symbols */
  int minShiftReduce;      /* Minimum shift-reduce action value */
  int errAction;           /* Error action value */
  int accAction;           /* Accept action value */
  int noAction;            /* No-op action value */
  int minReduce;           /* Minimum reduce action */
  int maxAction;           /* Maximum action value of any kind */
  struct symbol **symbols; /* Sorted array of pointers to symbols */
  int errorcnt;            /* Number of errors */
  struct symbol *errsym;   /* The error symbol */
  struct symbol *wildcard; /* Token that matches anything */
  char *name;              /* Name of the generated parser */
  char *arg;               /* Declaration of the 3th argument to parser */
  char *ctx;               /* Declaration of 2nd argument to constructor */
  char *tokentype;         /* Type of terminal symbols in the parser stack */
  char *vartype;           /* The default type of non-terminal symbols */
  char *start;             /* Name of the start symbol for the grammar */
  char *stacksize;         /* Size of the parser stack */
  char *include;           /* Code to put at the start of the C file */
  char *error;             /* Code to execute when an error is seen */
  char *overflow;          /* Code to execute on a stack overflow */
  char *failure;           /* Code to execute on parser failure */
  char *accept;            /* Code to execute when the parser excepts */
  char *extracode;         /* Code appended to the generated file */
  char *tokendest;         /* Code to execute to destroy token data */
  char *vardest;           /* Code for the default non-terminal destructor */
  char *filename;          /* Name of the input file */
  char *outname;           /* Name of the current output file */
  char *tokenprefix;       /* A prefix added to token names in the .h file */
  int nconflict;           /* Number of parsing conflicts */
  int nactiontab;          /* Number of entries in the yy_action[] table */
  int nlookaheadtab;       /* Number of entries in yy_lookahead[] */
  int tablesize;           /* Total table size of all tables in bytes */
  int basisflag;           /* Print only basis configurations */
  int printPreprocessed;   /* Show preprocessor output on stdout */
  int has_fallback;        /* True if any %fallback is seen in the grammar */
  int nolinenosflag;       /* True if #line statements should not be printed */
  char *argv0;             /* Name of the program */
};

#define MemoryCheck(X) \
  if ((X) == 0) {      \
    memory_error();    \
  }

/**************** From the file "table.h" *********************************/
/*
** All code in this file has been automatically generated
** from a specification in the file
**              "table.q"
** by the associative array code building program "aagen".
** Do not edit this file!  Instead, edit the specification
** file, then rerun aagen.
*/
/*
** Code for processing tables in the LEMON parser generator.
*/
/* Routines for handling a strings */

const char *Strsafe(const char *);

void Strsafe_init(void);
int Strsafe_insert(const char *);
const char *Strsafe_find(const char *);

/* Routines for handling symbols of the grammar */

struct symbol *Symbol_new(const char *);
int Symbolcmpp(const void *, const void *);
void Symbol_init(void);
int Symbol_insert(struct symbol *, const char *);
struct symbol *Symbol_find(const char *);
struct symbol *Symbol_Nth(int);
int Symbol_count(void);
struct symbol **Symbol_arrayof(void);

/* Routines to manage the state table */

int Configcmp(const char *, const char *);
struct state *State_new(void);
void State_init(void);
int State_insert(struct state *, struct config *);
struct state *State_find(struct config *);
struct state **State_arrayof(void);

/* Routines used for efficiency in Configlist_add */

void Configtable_init(void);
int Configtable_insert(struct config *);
struct config *Configtable_find(struct config *);
void Configtable_clear(int (*)(struct config *));

/****************** From the file "action.c" *******************************/
/*
** Routines processing parser actions in the LEMON parser generator.
*/

/* Allocate a new parser action */
static struct action *Action_new(void) {
  static struct action *actionfreelist = 0;
  struct action *newaction;

  if (actionfreelist == 0) {
    int i;
    int amt = 100;
    actionfreelist = (struct action *)calloc(amt, sizeof(struct action));
    if (actionfreelist == 0) {
      fprintf(stderr, "Unable to allocate memory for a new parser action.");
      exit(1);
    }
    for (i = 0; i < amt - 1; i++)
      actionfreelist[i].next = &actionfreelist[i + 1];
    actionfreelist[amt - 1].next = 0;
  }
  newaction = actionfreelist;
  actionfreelist = actionfreelist->next;
  return newaction;
}

/* Compare two actions for sorting purposes.  Return negative, zero, or
** positive if the first action is less than, equal to, or greater than
** the first
*/
static int actioncmp(struct action *ap1, struct action *ap2) {
  int rc;
  rc = ap1->sp->index - ap2->sp->index;
  if (rc == 0) {
    rc = (int)ap1->type - (int)ap2->type;
  }
  if (rc == 0 && (ap1->type == REDUCE || ap1->type == SHIFTREDUCE)) {
    rc = ap1->x.rp->index - ap2->x.rp->index;
  }
  if (rc == 0) {
    rc = (int)(ap2 - ap1);
  }
  return rc;
}

/* Sort parser actions */
static struct action *Action_sort(struct action *ap) {
  ap = (struct action *)msort((char *)ap, (char **)&ap->next,
                              (int (*)(const char *, const char *))actioncmp);
  return ap;
}

void Action_add(struct action **app, enum e_action type, struct symbol *sp,
                char *arg) {
  struct action *newaction;
  newaction = Action_new();
  newaction->next = *app;
  *app = newaction;
  newaction->type = type;
  newaction->sp = sp;
  newaction->spOpt = 0;
  if (type == SHIFT) {
    newaction->x.stp = (struct state *)arg;
  } else {
    newaction->x.rp = (struct rule *)arg;
  }
}
/********************** New code to implement the "acttab" module ***********/
/*
** This module implements routines use to construct the yy_action[] table.
*/

/*
** The state of the yy_action table under construction is an instance of
** the following structure.
**
** The yy_action table maps the pair (state_number, lookahead) into an
** action_number.  The table is an array of integers pairs.  The state_number
** determines an initial offset into the yy_action array.  The lookahead
** value is then added to this initial offset to get an index X into the
** yy_action array. If the aAction[X].lookahead equals the value of the
** of the lookahead input, then the value of the action_number output is
** aAction[X].action.  If the lookaheads do not match then the
** default action for the state_number is returned.
**
** All actions associated with a single state_number are first entered
** into aLookahead[] using multiple calls to acttab_action().  Then the
** actions for that single state_number are placed into the aAction[]
** array with a single call to acttab_insert().  The acttab_insert() call
** also resets the aLookahead[] array in preparation for the next
** state number.
*/
struct lookahead_action {
  int lookahead; /* Value of the lookahead token */
  int action;    /* Action to take on the given lookahead */
};
typedef struct acttab acttab;
struct acttab {
  int nAction;      /* Number of used slots in aAction[] */
  int nActionAlloc; /* Slots allocated for aAction[] */
  struct lookahead_action
      *aAction,        /* The yy_action[] table under construction */
      *aLookahead;     /* A single new transaction set */
  int mnLookahead;     /* Minimum aLookahead[].lookahead */
  int mnAction;        /* Action associated with mnLookahead */
  int mxLookahead;     /* Maximum aLookahead[].lookahead */
  int nLookahead;      /* Used slots in aLookahead[] */
  int nLookaheadAlloc; /* Slots allocated in aLookahead[] */
  int nterminal;       /* Number of terminal symbols */
  int nsymbol;         /* total number of symbols */
};

/* Return the number of entries in the yy_action table */
#define acttab_lookahead_size(X) ((X)->nAction)

/* The value for the N-th entry in yy_action */
#define acttab_yyaction(X, N) ((X)->aAction[N].action)

/* The value for the N-th entry in yy_lookahead */
#define acttab_yylookahead(X, N) ((X)->aAction[N].lookahead)

/* Free all memory associated with the given acttab */
void acttab_free(acttab *p) {
  free(p->aAction);
  free(p->aLookahead);
  free(p);
}

/* Allocate a new acttab structure */
acttab *acttab_alloc(int nsymbol, int nterminal) {
  acttab *p = (acttab *)calloc(1, sizeof(*p));
  if (p == 0) {
    fprintf(stderr, "Unable to allocate memory for a new acttab.");
    exit(1);
  }
  memset(p, 0, sizeof(*p));
  p->nsymbol = nsymbol;
  p->nterminal = nterminal;
  return p;
}

/* Add a new action to the current transaction set.
**
** This routine is called once for each lookahead for a particular
** state.
*/
void acttab_action(acttab *p, int lookahead, int action) {
  if (p->nLookahead >= p->nLookaheadAlloc) {
    p->nLookaheadAlloc += 25;
    p->aLookahead = (struct lookahead_action *)realloc(
        p->aLookahead, sizeof(p->aLookahead[0]) * p->nLookaheadAlloc);
    if (p->aLookahead == 0) {
      fprintf(stderr, "malloc failed\n");
      exit(1);
    }
  }
  if (p->nLookahead == 0) {
    p->mxLookahead = lookahead;
    p->mnLookahead = lookahead;
    p->mnAction = action;
  } else {
    if (p->mxLookahead < lookahead) p->mxLookahead = lookahead;
    if (p->mnLookahead > lookahead) {
      p->mnLookahead = lookahead;
      p->mnAction = action;
    }
  }
  p->aLookahead[p->nLookahead].lookahead = lookahead;
  p->aLookahead[p->nLookahead].action = action;
  p->nLookahead++;
}

/*
** Add the transaction set built up with prior calls to acttab_action()
** into the current action table.  Then reset the transaction set back
** to an empty set in preparation for a new round of acttab_action() calls.
**
** Return the offset into the action table of the new transaction.
**
** If the makeItSafe parameter is true, then the offset is chosen so that
** it is impossible to overread the yy_lookaside[] table regardless of
** the lookaside token.  This is done for the terminal symbols, as they
** come from external inputs and can contain syntax errors.  When makeItSafe
** is false, there is more flexibility in selecting offsets, resulting in
** a smaller table.  For non-terminal symbols, which are never syntax errors,
** makeItSafe can be false.
*/
int acttab_insert(acttab *p, int makeItSafe) {
  int i, j, k, n, end;
  assert(p->nLookahead > 0);

  /* Make sure we have enough space to hold the expanded action table
  ** in the worst case.  The worst case occurs if the transaction set
  ** must be appended to the current action table
  */
  n = p->nsymbol + 1;
  if (p->nAction + n >= p->nActionAlloc) {
    int oldAlloc = p->nActionAlloc;
    p->nActionAlloc = p->nAction + n + p->nActionAlloc + 20;
    p->aAction = (struct lookahead_action *)realloc(
        p->aAction, sizeof(p->aAction[0]) * p->nActionAlloc);
    if (p->aAction == 0) {
      fprintf(stderr, "malloc failed\n");
      exit(1);
    }
    for (i = oldAlloc; i < p->nActionAlloc; i++) {
      p->aAction[i].lookahead = -1;
      p->aAction[i].action = -1;
    }
  }

  /* Scan the existing action table looking for an offset that is a
  ** duplicate of the current transaction set.  Fall out of the loop
  ** if and when the duplicate is found.
  **
  ** i is the index in p->aAction[] where p->mnLookahead is inserted.
  */
  end = makeItSafe ? p->mnLookahead : 0;
  for (i = p->nAction - 1; i >= end; i--) {
    if (p->aAction[i].lookahead == p->mnLookahead) {
      /* All lookaheads and actions in the aLookahead[] transaction
      ** must match against the candidate aAction[i] entry. */
      if (p->aAction[i].action != p->mnAction) continue;
      for (j = 0; j < p->nLookahead; j++) {
        k = p->aLookahead[j].lookahead - p->mnLookahead + i;
        if (k < 0 || k >= p->nAction) break;
        if (p->aLookahead[j].lookahead != p->aAction[k].lookahead) break;
        if (p->aLookahead[j].action != p->aAction[k].action) break;
      }
      if (j < p->nLookahead) continue;

      /* No possible lookahead value that is not in the aLookahead[]
      ** transaction is allowed to match aAction[i] */
      n = 0;
      for (j = 0; j < p->nAction; j++) {
        if (p->aAction[j].lookahead < 0) continue;
        if (p->aAction[j].lookahead == j + p->mnLookahead - i) n++;
      }
      if (n == p->nLookahead) {
        break; /* An exact match is found at offset i */
      }
    }
  }

  /* If no existing offsets exactly match the current transaction, find an
  ** an empty offset in the aAction[] table in which we can add the
  ** aLookahead[] transaction.
  */
  if (i < end) {
    /* Look for holes in the aAction[] table that fit the current
    ** aLookahead[] transaction.  Leave i set to the offset of the hole.
    ** If no holes are found, i is left at p->nAction, which means the
    ** transaction will be appended. */
    i = makeItSafe ? p->mnLookahead : 0;
    for (; i < p->nActionAlloc - p->mxLookahead; i++) {
      if (p->aAction[i].lookahead < 0) {
        for (j = 0; j < p->nLookahead; j++) {
          k = p->aLookahead[j].lookahead - p->mnLookahead + i;
          if (k < 0) break;
          if (p->aAction[k].lookahead >= 0) break;
        }
        if (j < p->nLookahead) continue;
        for (j = 0; j < p->nAction; j++) {
          if (p->aAction[j].lookahead == j + p->mnLookahead - i) break;
        }
        if (j == p->nAction) {
          break; /* Fits in empty slots */
        }
      }
    }
  }
  /* Insert transaction set at index i. */
#if 0
  printf("Acttab:");
  for(j=0; j<p->nLookahead; j++){
    printf(" %d", p->aLookahead[j].lookahead);
  }
  printf(" inserted at %d\n", i);
#endif
  for (j = 0; j < p->nLookahead; j++) {
    k = p->aLookahead[j].lookahead - p->mnLookahead + i;
    p->aAction[k] = p->aLookahead[j];
    if (k >= p->nAction) p->nAction = k + 1;
  }
  if (makeItSafe && i + p->nterminal >= p->nAction)
    p->nAction = i + p->nterminal + 1;
  p->nLookahead = 0;

  /* Return the offset that is added to the lookahead in order to get the
  ** index into yy_action of the action */
  return i - p->mnLookahead;
}

/*
** Return the size of the action table without the trailing syntax error
** entries.
*/
int acttab_action_size(acttab *p) {
  int n = p->nAction;
  while (n > 0 && p->aAction[n - 1].lookahead < 0) {
    n--;
  }
  return n;
}

/********************** From the file "build.c" *****************************/
/*
** Routines to construction the finite state machine for the LEMON
** parser generator.
*/

/* Find a precedence symbol of every rule in the grammar.
**
** Those rules which have a precedence symbol coded in the input
** grammar using the "[symbol]" construct will already have the
** rp->precsym field filled.  Other rules take as their precedence
** symbol the first RHS symbol with a defined precedence.  If there
** are not RHS symbols with a defined precedence, the precedence
** symbol field is left blank.
*/
void FindRulePrecedences(struct lemon *xp) {
  struct rule *rp;
  for (rp = xp->rule; rp; rp = rp->next) {
    if (rp->precsym == 0) {
      int i, j;
      for (i = 0; i < rp->nrhs && rp->precsym == 0; i++) {
        struct symbol *sp = rp->rhs[i];
        if (sp->type == MULTITERMINAL) {
          for (j = 0; j < sp->nsubsym; j++) {
            if (sp->subsym[j]->prec >= 0) {
              rp->precsym = sp->subsym[j];
              break;
            }
          }
        } else if (sp->prec >= 0) {
          rp->precsym = rp->rhs[i];
        }
      }
    }
  }
  return;
}

/* Find all nonterminals which will generate the empty string.
** Then go back and compute the first sets of every nonterminal.
** The first set is the set of all terminal symbols which can begin
** a string generated by that nonterminal.
*/
void FindFirstSets(struct lemon *lemp) {
  int i, j;
  struct rule *rp;
  int progress;

  for (i = 0; i < lemp->nsymbol; i++) {
    lemp->symbols[i]->lambda = LEMON_FALSE;
  }
  for (i = lemp->nterminal; i < lemp->nsymbol; i++) {
    lemp->symbols[i]->firstset = SetNew();
  }

  /* First compute all lambdas */
  do {
    progress = 0;
    for (rp = lemp->rule; rp; rp = rp->next) {
      if (rp->lhs->lambda) continue;
      for (i = 0; i < rp->nrhs; i++) {
        struct symbol *sp = rp->rhs[i];
        assert(sp->type == NONTERMINAL || sp->lambda == LEMON_FALSE);
        if (sp->lambda == LEMON_FALSE) break;
      }
      if (i == rp->nrhs) {
        rp->lhs->lambda = LEMON_TRUE;
        progress = 1;
      }
    }
  } while (progress);

  /* Now compute all first sets */
  do {
    struct symbol *s1, *s2;
    progress = 0;
    for (rp = lemp->rule; rp; rp = rp->next) {
      s1 = rp->lhs;
      for (i = 0; i < rp->nrhs; i++) {
        s2 = rp->rhs[i];
        if (s2->type == TERMINAL) {
          progress += SetAdd(s1->firstset, s2->index);
          break;
        } else if (s2->type == MULTITERMINAL) {
          for (j = 0; j < s2->nsubsym; j++) {
            progress += SetAdd(s1->firstset, s2->subsym[j]->index);
          }
          break;
        } else if (s1 == s2) {
          if (s1->lambda == LEMON_FALSE) break;
        } else {
          progress += SetUnion(s1->firstset, s2->firstset);
          if (s2->lambda == LEMON_FALSE) break;
        }
      }
    }
  } while (progress);
  return;
}

/* Compute all LR(0) states for the grammar.  Links
** are added to between some states so that the LR(1) follow sets
** can be computed later.
*/
PRIVATE struct state *getstate(struct lemon *); /* forward reference */
void FindStates(struct lemon *lemp) {
  struct symbol *sp;
  struct rule *rp;

  Configlist_init();

  /* Find the start symbol */
  if (lemp->start) {
    sp = Symbol_find(lemp->start);
    if (sp == 0) {
      ErrorMsg(
          lemp->filename, 0,
          "The specified start symbol \"%s\" is not "
          "in a nonterminal of the grammar.  \"%s\" will be used as the start "
          "symbol instead.",
          lemp->start, lemp->startRule->lhs->name);
      lemp->errorcnt++;
      sp = lemp->startRule->lhs;
    }
  } else {
    sp = lemp->startRule->lhs;
  }

  /* Make sure the start symbol doesn't occur on the right-hand side of
  ** any rule.  Report an error if it does.  (YACC would generate a new
  ** start symbol in this case.) */
  for (rp = lemp->rule; rp; rp = rp->next) {
    int i;
    for (i = 0; i < rp->nrhs; i++) {
      if (rp->rhs[i] == sp) { /* FIX ME:  Deal with multiterminals */
        ErrorMsg(
            lemp->filename, 0,
            "The start symbol \"%s\" occurs on the "
            "right-hand side of a rule. This will result in a parser which "
            "does not work properly.",
            sp->name);
        lemp->errorcnt++;
      }
    }
  }

  /* The basis configuration set for the first state
  ** is all rules which have the start symbol as their
  ** left-hand side */
  for (rp = sp->rule; rp; rp = rp->nextlhs) {
    struct config *newcfp;
    rp->lhsStart = 1;
    newcfp = Configlist_addbasis(rp, 0);
    SetAdd(newcfp->fws, 0);
  }

  /* Compute the first state.  All other states will be
  ** computed automatically during the computation of the first one.
  ** The returned pointer to the first state is not used. */
  (void)getstate(lemp);
  return;
}

/* Return a pointer to a state which is described by the configuration
** list which has been built from calls to Configlist_add.
*/
PRIVATE void buildshifts(struct lemon *, struct state *); /* Forwd ref */
PRIVATE struct state *getstate(struct lemon *lemp) {
  struct config *cfp, *bp;
  struct state *stp;

  /* Extract the sorted basis of the new state.  The basis was constructed
  ** by prior calls to "Configlist_addbasis()". */
  Configlist_sortbasis();
  bp = Configlist_basis();

  /* Get a state with the same basis */
  stp = State_find(bp);
  if (stp) {
    /* A state with the same basis already exists!  Copy all the follow-set
    ** propagation links from the state under construction into the
    ** preexisting state, then return a pointer to the preexisting state */
    struct config *x, *y;
    for (x = bp, y = stp->bp; x && y; x = x->bp, y = y->bp) {
      Plink_copy(&y->bplp, x->bplp);
      Plink_delete(x->fplp);
      x->fplp = x->bplp = 0;
    }
    cfp = Configlist_return();
    Configlist_eat(cfp);
  } else {
    /* This really is a new state.  Construct all the details */
    Configlist_closure(lemp);  /* Compute the configuration closure */
    Configlist_sort();         /* Sort the configuration closure */
    cfp = Configlist_return(); /* Get a pointer to the config list */
    stp = State_new();         /* A new state structure */
    MemoryCheck(stp);
    stp->bp = bp;                   /* Remember the configuration basis */
    stp->cfp = cfp;                 /* Remember the configuration closure */
    stp->statenum = lemp->nstate++; /* Every state gets a sequence number */
    stp->ap = 0;                    /* No actions, yet. */
    State_insert(stp, stp->bp);     /* Add to the state table */
    buildshifts(lemp, stp);         /* Recursively compute successor states */
  }
  return stp;
}

/*
** Return true if two symbols are the same.
*/
int same_symbol(struct symbol *a, struct symbol *b) {
  int i;
  if (a == b) return 1;
  if (a->type != MULTITERMINAL) return 0;
  if (b->type != MULTITERMINAL) return 0;
  if (a->nsubsym != b->nsubsym) return 0;
  for (i = 0; i < a->nsubsym; i++) {
    if (a->subsym[i] != b->subsym[i]) return 0;
  }
  return 1;
}

/* Construct all successor states to the given state.  A "successor"
** state is any state which can be reached by a shift action.
*/
PRIVATE void buildshifts(struct lemon *lemp, struct state *stp) {
  struct config *cfp;    /* For looping thru the config closure of "stp" */
  struct config *bcfp;   /* For the inner loop on config closure of "stp" */
  struct config *newcfg; /* */
  struct symbol *sp;     /* Symbol following the dot in configuration "cfp" */
  struct symbol *bsp;    /* Symbol following the dot in configuration "bcfp" */
  struct state *newstp;  /* A pointer to a successor state */

  /* Each configuration becomes complete after it contibutes to a successor
  ** state.  Initially, all configurations are incomplete */
  for (cfp = stp->cfp; cfp; cfp = cfp->next) cfp->status = INCOMPLETE;

  /* Loop through all configurations of the state "stp" */
  for (cfp = stp->cfp; cfp; cfp = cfp->next) {
    if (cfp->status == COMPLETE) continue;   /* Already used by inner loop */
    if (cfp->dot >= cfp->rp->nrhs) continue; /* Can't shift this config */
    Configlist_reset();                      /* Reset the new config set */
    sp = cfp->rp->rhs[cfp->dot];             /* Symbol after the dot */

    /* For every configuration in the state "stp" which has the symbol "sp"
    ** following its dot, add the same configuration to the basis set under
    ** construction but with the dot shifted one symbol to the right. */
    for (bcfp = cfp; bcfp; bcfp = bcfp->next) {
      if (bcfp->status == COMPLETE) continue;    /* Already used */
      if (bcfp->dot >= bcfp->rp->nrhs) continue; /* Can't shift this one */
      bsp = bcfp->rp->rhs[bcfp->dot];            /* Get symbol after dot */
      if (!same_symbol(bsp, sp)) continue;       /* Must be same as for "cfp" */
      bcfp->status = COMPLETE;                   /* Mark this config as used */
      newcfg = Configlist_addbasis(bcfp->rp, bcfp->dot + 1);
      Plink_add(&newcfg->bplp, bcfp);
    }

    /* Get a pointer to the state described by the basis configuration set
    ** constructed in the preceding loop */
    newstp = getstate(lemp);

    /* The state "newstp" is reached from the state "stp" by a shift action
    ** on the symbol "sp" */
    if (sp->type == MULTITERMINAL) {
      int i;
      for (i = 0; i < sp->nsubsym; i++) {
        Action_add(&stp->ap, SHIFT, sp->subsym[i], (char *)newstp);
      }
    } else {
      Action_add(&stp->ap, SHIFT, sp, (char *)newstp);
    }
  }
}

/*
** Construct the propagation links
*/
void FindLinks(struct lemon *lemp) {
  int i;
  struct config *cfp, *other;
  struct state *stp;
  struct plink *plp;

  /* Housekeeping detail:
  ** Add to every propagate link a pointer back to the state to
  ** which the link is attached. */
  for (i = 0; i < lemp->nstate; i++) {
    stp = lemp->sorted[i];
    for (cfp = stp->cfp; cfp; cfp = cfp->next) {
      cfp->stp = stp;
    }
  }

  /* Convert all backlinks into forward links.  Only the forward
  ** links are used in the follow-set computation. */
  for (i = 0; i < lemp->nstate; i++) {
    stp = lemp->sorted[i];
    for (cfp = stp->cfp; cfp; cfp = cfp->next) {
      for (plp = cfp->bplp; plp; plp = plp->next) {
        other = plp->cfp;
        Plink_add(&other->fplp, cfp);
      }
    }
  }
}

/* Compute all followsets.
**
** A followset is the set of all symbols which can come immediately
** after a configuration.
*/
void FindFollowSets(struct lemon *lemp) {
  int i;
  struct config *cfp;
  struct plink *plp;
  int progress;
  int change;

  for (i = 0; i < lemp->nstate; i++) {
    for (cfp = lemp->sorted[i]->cfp; cfp; cfp = cfp->next) {
      cfp->status = INCOMPLETE;
    }
  }

  do {
    progress = 0;
    for (i = 0; i < lemp->nstate; i++) {
      for (cfp = lemp->sorted[i]->cfp; cfp; cfp = cfp->next) {
        if (cfp->status == COMPLETE) continue;
        for (plp = cfp->fplp; plp; plp = plp->next) {
          change = SetUnion(plp->cfp->fws, cfp->fws);
          if (change) {
            plp->cfp->status = INCOMPLETE;
            progress = 1;
          }
        }
        cfp->status = COMPLETE;
      }
    }
  } while (progress);
}

static int resolve_conflict(struct action *, struct action *);

/* Compute the reduce actions, and resolve conflicts.
 */
void FindActions(struct lemon *lemp) {
  int i, j;
  struct config *cfp;
  struct state *stp;
  struct symbol *sp;
  struct rule *rp;

  /* Add all of the reduce actions
  ** A reduce action is added for each element of the followset of
  ** a configuration which has its dot at the extreme right.
  */
  for (i = 0; i < lemp->nstate; i++) { /* Loop over all states */
    stp = lemp->sorted[i];
    for (cfp = stp->cfp; cfp;
         cfp = cfp->next) {            /* Loop over all configurations */
      if (cfp->rp->nrhs == cfp->dot) { /* Is dot at extreme right? */
        for (j = 0; j < lemp->nterminal; j++) {
          if (SetFind(cfp->fws, j)) {
            /* Add a reduce action to the state "stp" which will reduce by the
            ** rule "cfp->rp" if the lookahead symbol is "lemp->symbols[j]" */
            Action_add(&stp->ap, REDUCE, lemp->symbols[j], (char *)cfp->rp);
          }
        }
      }
    }
  }

  /* Add the accepting token */
  if (lemp->start) {
    sp = Symbol_find(lemp->start);
    if (sp == 0) sp = lemp->startRule->lhs;
  } else {
    sp = lemp->startRule->lhs;
  }
  /* Add to the first state (which is always the starting state of the
  ** finite state machine) an action to ACCEPT if the lookahead is the
  ** start nonterminal.  */
  Action_add(&lemp->sorted[0]->ap, ACCEPT, sp, 0);

  /* Resolve conflicts */
  for (i = 0; i < lemp->nstate; i++) {
    struct action *ap, *nap;
    stp = lemp->sorted[i];
    /* assert( stp->ap ); */
    stp->ap = Action_sort(stp->ap);
    for (ap = stp->ap; ap && ap->next; ap = ap->next) {
      for (nap = ap->next; nap && nap->sp == ap->sp; nap = nap->next) {
        /* The two actions "ap" and "nap" have the same lookahead.
        ** Figure out which one should be used */
        lemp->nconflict += resolve_conflict(ap, nap);
      }
    }
  }

  /* Report an error for each rule that can never be reduced. */
  for (rp = lemp->rule; rp; rp = rp->next) rp->canReduce = LEMON_FALSE;
  for (i = 0; i < lemp->nstate; i++) {
    struct action *ap;
    for (ap = lemp->sorted[i]->ap; ap; ap = ap->next) {
      if (ap->type == REDUCE) ap->x.rp->canReduce = LEMON_TRUE;
    }
  }
  for (rp = lemp->rule; rp; rp = rp->next) {
    if (rp->canReduce) continue;
    ErrorMsg(lemp->filename, rp->ruleline, "This rule can not be reduced.\n");
    lemp->errorcnt++;
  }
}

/* Resolve a conflict between the two given actions.  If the
** conflict can't be resolved, return non-zero.
**
** NO LONGER TRUE:
**   To resolve a conflict, first look to see if either action
**   is on an error rule.  In that case, take the action which
**   is not associated with the error rule.  If neither or both
**   actions are associated with an error rule, then try to
**   use precedence to resolve the conflict.
**
** If either action is a SHIFT, then it must be apx.  This
** function won't work if apx->type==REDUCE and apy->type==SHIFT.
*/
static int resolve_conflict(struct action *apx, struct action *apy) {
  struct symbol *spx, *spy;
  int errcnt = 0;
  assert(apx->sp == apy->sp); /* Otherwise there would be no conflict */
  if (apx->type == SHIFT && apy->type == SHIFT) {
    apy->type = SSCONFLICT;
    errcnt++;
  }
  if (apx->type == SHIFT && apy->type == REDUCE) {
    spx = apx->sp;
    spy = apy->x.rp->precsym;
    if (spy == 0 || spx->prec < 0 || spy->prec < 0) {
      /* Not enough precedence information. */
      apy->type = SRCONFLICT;
      errcnt++;
    } else if (spx->prec > spy->prec) { /* higher precedence wins */
      apy->type = RD_RESOLVED;
    } else if (spx->prec < spy->prec) {
      apx->type = SH_RESOLVED;
    } else if (spx->prec == spy->prec &&
               spx->assoc == RIGHT) { /* Use operator */
      apy->type = RD_RESOLVED;        /* associativity */
    } else if (spx->prec == spy->prec &&
               spx->assoc == LEFT) { /* to break tie */
      apx->type = SH_RESOLVED;
    } else {
      assert(spx->prec == spy->prec && spx->assoc == NONE);
      apx->type = ERROR;
    }
  } else if (apx->type == REDUCE && apy->type == REDUCE) {
    spx = apx->x.rp->precsym;
    spy = apy->x.rp->precsym;
    if (spx == 0 || spy == 0 || spx->prec < 0 || spy->prec < 0 ||
        spx->prec == spy->prec) {
      apy->type = RRCONFLICT;
      errcnt++;
    } else if (spx->prec > spy->prec) {
      apy->type = RD_RESOLVED;
    } else if (spx->prec < spy->prec) {
      apx->type = RD_RESOLVED;
    }
  } else {
    assert(apx->type == SH_RESOLVED || apx->type == RD_RESOLVED ||
           apx->type == SSCONFLICT || apx->type == SRCONFLICT ||
           apx->type == RRCONFLICT || apy->type == SH_RESOLVED ||
           apy->type == RD_RESOLVED || apy->type == SSCONFLICT ||
           apy->type == SRCONFLICT || apy->type == RRCONFLICT);
    /* The REDUCE/SHIFT case cannot happen because SHIFTs come before
    ** REDUCEs on the list.  If we reach this point it must be because
    ** the parser conflict had already been resolved. */
  }
  return errcnt;
}
/********************* From the file "configlist.c" *************************/
/*
** Routines to processing a configuration list and building a state
** in the LEMON parser generator.
*/

static struct config *freelist = 0;    /* List of free configurations */
static struct config *current = 0;     /* Top of list of configurations */
static struct config **currentend = 0; /* Last on list of configs */
static struct config *basis = 0;       /* Top of list of basis configs */
static struct config **basisend = 0;   /* End of list of basis configs */

/* Return a pointer to a new configuration */
PRIVATE struct config *newconfig(void) {
  struct config *newcfg;
  if (freelist == 0) {
    int i;
    int amt = 3;
    freelist = (struct config *)calloc(amt, sizeof(struct config));
    if (freelist == 0) {
      fprintf(stderr, "Unable to allocate memory for a new configuration.");
      exit(1);
    }
    for (i = 0; i < amt - 1; i++) freelist[i].next = &freelist[i + 1];
    freelist[amt - 1].next = 0;
  }
  newcfg = freelist;
  freelist = freelist->next;
  return newcfg;
}

/* The configuration "old" is no longer used */
PRIVATE void deleteconfig(struct config *old) {
  old->next = freelist;
  freelist = old;
}

/* Initialized the configuration list builder */
void Configlist_init(void) {
  current = 0;
  currentend = &current;
  basis = 0;
  basisend = &basis;
  Configtable_init();
  return;
}

/* Initialized the configuration list builder */
void Configlist_reset(void) {
  current = 0;
  currentend = &current;
  basis = 0;
  basisend = &basis;
  Configtable_clear(0);
  return;
}

/* Add another configuration to the configuration list */
struct config *Configlist_add(
    struct rule *rp, /* The rule */
    int dot          /* Index into the RHS of the rule where the dot goes */
) {
  struct config *cfp, model;

  assert(currentend != 0);
  model.rp = rp;
  model.dot = dot;
  cfp = Configtable_find(&model);
  if (cfp == 0) {
    cfp = newconfig();
    cfp->rp = rp;
    cfp->dot = dot;
    cfp->fws = SetNew();
    cfp->stp = 0;
    cfp->fplp = cfp->bplp = 0;
    cfp->next = 0;
    cfp->bp = 0;
    *currentend = cfp;
    currentend = &cfp->next;
    Configtable_insert(cfp);
  }
  return cfp;
}

/* Add a basis configuration to the configuration list */
struct config *Configlist_addbasis(struct rule *rp, int dot) {
  struct config *cfp, model;

  assert(basisend != 0);
  assert(currentend != 0);
  model.rp = rp;
  model.dot = dot;
  cfp = Configtable_find(&model);
  if (cfp == 0) {
    cfp = newconfig();
    cfp->rp = rp;
    cfp->dot = dot;
    cfp->fws = SetNew();
    cfp->stp = 0;
    cfp->fplp = cfp->bplp = 0;
    cfp->next = 0;
    cfp->bp = 0;
    *currentend = cfp;
    currentend = &cfp->next;
    *basisend = cfp;
    basisend = &cfp->bp;
    Configtable_insert(cfp);
  }
  return cfp;
}

/* Compute the closure of the configuration list */
void Configlist_closure(struct lemon *lemp) {
  struct config *cfp, *newcfp;
  struct rule *rp, *newrp;
  struct symbol *sp, *xsp;
  int i, dot;

  assert(currentend != 0);
  for (cfp = current; cfp; cfp = cfp->next) {
    rp = cfp->rp;
    dot = cfp->dot;
    if (dot >= rp->nrhs) continue;
    sp = rp->rhs[dot];
    if (sp->type == NONTERMINAL) {
      if (sp->rule == 0 && sp != lemp->errsym) {
        ErrorMsg(lemp->filename, rp->line, "Nonterminal \"%s\" has no rules.",
                 sp->name);
        lemp->errorcnt++;
      }
      for (newrp = sp->rule; newrp; newrp = newrp->nextlhs) {
        newcfp = Configlist_add(newrp, 0);
        for (i = dot + 1; i < rp->nrhs; i++) {
          xsp = rp->rhs[i];
          if (xsp->type == TERMINAL) {
            SetAdd(newcfp->fws, xsp->index);
            break;
          } else if (xsp->type == MULTITERMINAL) {
            int k;
            for (k = 0; k < xsp->nsubsym; k++) {
              SetAdd(newcfp->fws, xsp->subsym[k]->index);
            }
            break;
          } else {
            SetUnion(newcfp->fws, xsp->firstset);
            if (xsp->lambda == LEMON_FALSE) break;
          }
        }
        if (i == rp->nrhs) Plink_add(&cfp->fplp, newcfp);
      }
    }
  }
  return;
}

/* Sort the configuration list */
void Configlist_sort(void) {
  current = (struct config *)msort((char *)current, (char **)&(current->next),
                                   Configcmp);
  currentend = 0;
  return;
}

/* Sort the basis configuration list */
void Configlist_sortbasis(void) {
  basis = (struct config *)msort((char *)current, (char **)&(current->bp),
                                 Configcmp);
  basisend = 0;
  return;
}

/* Return a pointer to the head of the configuration list and
** reset the list */
struct config *Configlist_return(void) {
  struct config *old;
  old = current;
  current = 0;
  currentend = 0;
  return old;
}

/* Return a pointer to the head of the configuration list and
** reset the list */
struct config *Configlist_basis(void) {
  struct config *old;
  old = basis;
  basis = 0;
  basisend = 0;
  return old;
}

/* Free all elements of the given configuration list */
void Configlist_eat(struct config *cfp) {
  struct config *nextcfp;
  for (; cfp; cfp = nextcfp) {
    nextcfp = cfp->next;
    assert(cfp->fplp == 0);
    assert(cfp->bplp == 0);
    if (cfp->fws) SetFree(cfp->fws);
    deleteconfig(cfp);
  }
  return;
}
/***************** From the file "error.c" *********************************/
/*
** Code for printing error message.
*/

void ErrorMsg(const char *filename, int lineno, const char *format, ...) {
  va_list ap;
  fprintf(stderr, "%s:%d: ", filename, lineno);
  va_start(ap, format);
  vfprintf(stderr, format, ap);
  va_end(ap);
  fprintf(stderr, "\n");
}
/**************** From the file "main.c" ************************************/
/*
** Main program file for the LEMON parser generator.
*/

/* Report an out-of-memory condition and abort.  This function
** is used mostly by the "MemoryCheck" macro in struct.h
*/
void memory_error(void) {
  fprintf(stderr, "Out of memory.  Aborting...\n");
  exit(1);
}

static int nDefine = 0;     /* Number of -D options on the command line */
static char **azDefine = 0; /* Name of the -D macros */

/* This routine is called with the argument to each -D command-line option.
** Add the macro defined to the azDefine array.
*/
static void handle_D_option(char *z) {
  char **paz;
  nDefine++;
  azDefine = (char **)realloc(azDefine, sizeof(azDefine[0]) * nDefine);
  if (azDefine == 0) {
    fprintf(stderr, "out of memory\n");
    exit(1);
  }
  paz = &azDefine[nDefine - 1];
  *paz = (char *)malloc(lemonStrlen(z) + 1);
  if (*paz == 0) {
    fprintf(stderr, "out of memory\n");
    exit(1);
  }
  lemon_strcpy(*paz, z);
  for (z = *paz; *z && *z != '='; z++) {
  }
  *z = 0;
}

/* Rember the name of the output directory
 */
static char *outputDir = NULL;
static void handle_d_option(char *z) {
  outputDir = (char *)malloc(lemonStrlen(z) + 1);
  if (outputDir == 0) {
    fprintf(stderr, "out of memory\n");
    exit(1);
  }
  lemon_strcpy(outputDir, z);
}

static char *user_templatename = NULL;
static void handle_T_option(char *z) {
  user_templatename = (char *)malloc(lemonStrlen(z) + 1);
  if (user_templatename == 0) {
    memory_error();
  }
  lemon_strcpy(user_templatename, z);
}

/* Merge together to lists of rules ordered by rule.iRule */
static struct rule *Rule_merge(struct rule *pA, struct rule *pB) {
  struct rule *pFirst = 0;
  struct rule **ppPrev = &pFirst;
  while (pA && pB) {
    if (pA->iRule < pB->iRule) {
      *ppPrev = pA;
      ppPrev = &pA->next;
      pA = pA->next;
    } else {
      *ppPrev = pB;
      ppPrev = &pB->next;
      pB = pB->next;
    }
  }
  if (pA) {
    *ppPrev = pA;
  } else {
    *ppPrev = pB;
  }
  return pFirst;
}

/*
** Sort a list of rules in order of increasing iRule value
*/
static struct rule *Rule_sort(struct rule *rp) {
  unsigned int i;
  struct rule *pNext;
  struct rule *x[32];
  memset(x, 0, sizeof(x));
  while (rp) {
    pNext = rp->next;
    rp->next = 0;
    for (i = 0; i < sizeof(x) / sizeof(x[0]) - 1 && x[i]; i++) {
      rp = Rule_merge(x[i], rp);
      x[i] = 0;
    }
    x[i] = rp;
    rp = pNext;
  }
  rp = 0;
  for (i = 0; i < sizeof(x) / sizeof(x[0]); i++) {
    rp = Rule_merge(x[i], rp);
  }
  return rp;
}

/* forward reference */
static const char *minimum_size_type(int lwr, int upr, int *pnByte);

/* Print a single line of the "Parser Stats" output
 */
static void stats_line(const char *zLabel, int iValue) {
  int nLabel = lemonStrlen(zLabel);
  printf("  %s%.*s %5d\n", zLabel, 35 - nLabel,
         "................................", iValue);
}

/* The main program.  Parse the command line and do it... */
int main(int argc, char **argv) {
  static int version = 0;
  static int rpflag = 0;
  static int basisflag = 0;
  static int compress = 0;
  static int quiet = 0;
  static int statistics = 0;
  static int mhflag = 0;
  static int nolinenosflag = 0;
  static int noResort = 0;
  static int sqlFlag = 0;
  static int printPP = 0;

  static const struct s_options options[] = {
      {OPT_FLAG, "b", (char *)&basisflag, "Print only the basis in report."},
      {OPT_FLAG, "c", (char *)&compress, "Don't compress the action table."},
      {OPT_FSTR, "d", (char *)&handle_d_option,
       "Output directory.  Default '.'"},
      {OPT_FSTR, "D", (char *)handle_D_option, "Define an %ifdef macro."},
      {OPT_FLAG, "E", (char *)&printPP,
       "Print input file after preprocessing."},
      {OPT_FSTR, "f", 0, "Ignored.  (Placeholder for -f compiler options.)"},
      {OPT_FLAG, "g", (char *)&rpflag, "Print grammar without actions."},
      {OPT_FSTR, "I", 0, "Ignored.  (Placeholder for '-I' compiler options.)"},
      {OPT_FLAG, "m", (char *)&mhflag, "Output a makeheaders compatible file."},
      {OPT_FLAG, "l", (char *)&nolinenosflag, "Do not print #line statements."},
      {OPT_FSTR, "O", 0, "Ignored.  (Placeholder for '-O' compiler options.)"},
      {OPT_FLAG, "p", (char *)&showPrecedenceConflict,
       "Show conflicts resolved by precedence rules"},
      {OPT_FLAG, "q", (char *)&quiet, "(Quiet) Don't print the report file."},
      {OPT_FLAG, "r", (char *)&noResort, "Do not sort or renumber states"},
      {OPT_FLAG, "s", (char *)&statistics,
       "Print parser stats to standard output."},
      {OPT_FLAG, "S", (char *)&sqlFlag,
       "Generate the *.sql file describing the parser tables."},
      {OPT_FLAG, "x", (char *)&version, "Print the version number."},
      {OPT_FSTR, "T", (char *)handle_T_option, "Specify a template file."},
      {OPT_FSTR, "W", 0, "Ignored.  (Placeholder for '-W' compiler options.)"},
      {OPT_FLAG, 0, 0, 0}};
  int i;
  int exitcode;
  struct lemon lem;
  struct rule *rp;

  (void)argc;
  OptInit(argv, options, stderr);
  if (version) {
    printf("Lemon version 1.0\n");
    exit(0);
  }
  if (OptNArgs() != 1) {
    fprintf(stderr, "Exactly one filename argument is required.\n");
    exit(1);
  }
  memset(&lem, 0, sizeof(lem));
  lem.errorcnt = 0;

  /* Initialize the machine */
  Strsafe_init();
  Symbol_init();
  State_init();
  lem.argv0 = argv[0];
  lem.filename = OptArg(0);
  lem.basisflag = basisflag;
  lem.nolinenosflag = nolinenosflag;
  lem.printPreprocessed = printPP;
  Symbol_new("$");

  /* Parse the input file */
  Parse(&lem);
  if (lem.printPreprocessed || lem.errorcnt) exit(lem.errorcnt);
  if (lem.nrule == 0) {
    fprintf(stderr, "Empty grammar.\n");
    exit(1);
  }
  lem.errsym = Symbol_find("error");

  /* Count and index the symbols of the grammar */
  Symbol_new("{default}");
  lem.nsymbol = Symbol_count();
  lem.symbols = Symbol_arrayof();
  for (i = 0; i < lem.nsymbol; i++) lem.symbols[i]->index = i;
  qsort(lem.symbols, lem.nsymbol, sizeof(struct symbol *), Symbolcmpp);
  for (i = 0; i < lem.nsymbol; i++) lem.symbols[i]->index = i;
  while (lem.symbols[i - 1]->type == MULTITERMINAL) {
    i--;
  }
  assert(strcmp(lem.symbols[i - 1]->name, "{default}") == 0);
  lem.nsymbol = i - 1;
  for (i = 1; ISUPPER(lem.symbols[i]->name[0]); i++)
    ;
  lem.nterminal = i;

  /* Assign sequential rule numbers.  Start with 0.  Put rules that have no
  ** reduce action C-code associated with them last, so that the switch()
  ** statement that selects reduction actions will have a smaller jump table.
  */
  for (i = 0, rp = lem.rule; rp; rp = rp->next) {
    rp->iRule = rp->code ? i++ : -1;
  }
  lem.nruleWithAction = i;
  for (rp = lem.rule; rp; rp = rp->next) {
    if (rp->iRule < 0) rp->iRule = i++;
  }
  lem.startRule = lem.rule;
  lem.rule = Rule_sort(lem.rule);

  /* Generate a reprint of the grammar, if requested on the command line */
  if (rpflag) {
    Reprint(&lem);
  } else {
    /* Initialize the size for all follow and first sets */
    SetSize(lem.nterminal + 1);

    /* Find the precedence for every production rule (that has one) */
    FindRulePrecedences(&lem);

    /* Compute the lambda-nonterminals and the first-sets for every
    ** nonterminal */
    FindFirstSets(&lem);

    /* Compute all LR(0) states.  Also record follow-set propagation
    ** links so that the follow-set can be computed later */
    lem.nstate = 0;
    FindStates(&lem);
    lem.sorted = State_arrayof();

    /* Tie up loose ends on the propagation links */
    FindLinks(&lem);

    /* Compute the follow set of every reducible configuration */
    FindFollowSets(&lem);

    /* Compute the action tables */
    FindActions(&lem);

    /* Compress the action tables */
    if (compress == 0) CompressTables(&lem);

    /* Reorder and renumber the states so that states with fewer choices
    ** occur at the end.  This is an optimization that helps make the
    ** generated parser tables smaller. */
    if (noResort == 0) ResortStates(&lem);

    /* Generate a report of the parser generated.  (the "y.output" file) */
    if (!quiet) ReportOutput(&lem);

    /* Generate the source code for the parser */
    ReportTable(&lem, mhflag, sqlFlag);

    /* Produce a header file for use by the scanner.  (This step is
    ** omitted if the "-m" option is used because makeheaders will
    ** generate the file for us.) */
    if (!mhflag) ReportHeader(&lem);
  }
  if (statistics) {
    printf("Parser statistics:\n");
    stats_line("terminal symbols", lem.nterminal);
    stats_line("non-terminal symbols", lem.nsymbol - lem.nterminal);
    stats_line("total symbols", lem.nsymbol);
    stats_line("rules", lem.nrule);
    stats_line("states", lem.nxstate);
    stats_line("conflicts", lem.nconflict);
    stats_line("action table entries", lem.nactiontab);
    stats_line("lookahead table entries", lem.nlookaheadtab);
    stats_line("total table size (bytes)", lem.tablesize);
  }
  if (lem.nconflict > 0) {
    fprintf(stderr, "%d parsing conflicts.\n", lem.nconflict);
  }

  /* return 0 on success, 1 on failure. */
  exitcode = ((lem.errorcnt > 0) || (lem.nconflict > 0)) ? 1 : 0;
  exit(exitcode);
  return (exitcode);
}

/******************** From the file "msort.c" *******************************/
/*
** A generic merge-sort program.
**
** USAGE:
** Let "ptr" be a pointer to some structure which is at the head of
** a null-terminated list.  Then to sort the list call:
**
**     ptr = msort(ptr,&(ptr->next),cmpfnc);
**
** In the above, "cmpfnc" is a pointer to a function which compares
** two instances of the structure and returns an integer, as in
** strcmp.  The second argument is a pointer to the pointer to the
** second element of the linked list.  This address is used to compute
** the offset to the "next" field within the structure.  The offset to
** the "next" field must be constant for all structures in the list.
**
** The function returns a new pointer which is the head of the list
** after sorting.
**
** ALGORITHM:
** Merge-sort.
*/

/*
** Return a pointer to the next structure in the linked list.
*/
#define NEXT(A) (*(char **)(((char *)A) + offset))

/*
** Inputs:
**   a:       A sorted, null-terminated linked list.  (May be null).
**   b:       A sorted, null-terminated linked list.  (May be null).
**   cmp:     A pointer to the comparison function.
**   offset:  Offset in the structure to the "next" field.
**
** Return Value:
**   A pointer to the head of a sorted list containing the elements
**   of both a and b.
**
** Side effects:
**   The "next" pointers for elements in the lists a and b are
**   changed.
*/
static char *merge(char *a, char *b, int (*cmp)(const char *, const char *),
                   int offset) {
  char *ptr, *head;
  if (a == 0) {
    head = b;
  } else if (b == 0) {
    head = a;
  } else {
    if ((*cmp)(a, b) <= 0) {
      ptr = a;
      a = NEXT(a);
    } else {
      ptr = b;
      b = NEXT(b);
    }
    head = ptr;
    while (a && b) {
      if ((*cmp)(a, b) <= 0) {
        NEXT(ptr) = a;
        ptr = a;
        a = NEXT(a);
      } else {
        NEXT(ptr) = b;
        ptr = b;
        b = NEXT(b);
      }
    }
    if (a)
      NEXT(ptr) = a;
    else
      NEXT(ptr) = b;
  }
  return head;
}

/*
** Inputs:
**   list:      Pointer to a singly-linked list of structures.
**   next:      Pointer to pointer to the second element of the list.
**   cmp:       A comparison function.
**
** Return Value:
**   A pointer to the head of a sorted list containing the elements
**   orginally in list.
**
** Side effects:
**   The "next" pointers for elements in list are changed.
*/
#define LISTSIZE 30
static char *msort(char *list, char **next,
                   int (*cmp)(const char *, const char *)) {
  unsigned long offset;
  char *ep;
  char *set[LISTSIZE];
  int i;
  offset = (unsigned long)((char *)next - (char *)list);
  for (i = 0; i < LISTSIZE; i++) set[i] = 0;
  while (list) {
    ep = list;
    list = NEXT(list);
    NEXT(ep) = 0;
    for (i = 0; i < LISTSIZE - 1 && set[i] != 0; i++) {
      ep = merge(ep, set[i], cmp, offset);
      set[i] = 0;
    }
    set[i] = ep;
  }
  ep = 0;
  for (i = 0; i < LISTSIZE; i++)
    if (set[i]) ep = merge(set[i], ep, cmp, offset);
  return ep;
}

/************************ From the file "option.c" **************************/
static char **lemon_argv;
static struct s_options *op;
static FILE *errstream;

#define ISOPT(X) ((X)[0] == '-' || (X)[0] == '+' || strchr((X), '=') != 0)

/*
** Print the command line with a carrot pointing to the k-th character
** of the n-th field.
*/
static void errline(int n, int k, FILE *err) {
  int spcnt, i;
  if (lemon_argv[0]) fprintf(err, "%s", lemon_argv[0]);
  spcnt = lemonStrlen(lemon_argv[0]) + 1;
  for (i = 1; i < n && lemon_argv[i]; i++) {
    fprintf(err, " %s", lemon_argv[i]);
    spcnt += lemonStrlen(lemon_argv[i]) + 1;
  }
  spcnt += k;
  for (; lemon_argv[i]; i++) fprintf(err, " %s", lemon_argv[i]);
  if (spcnt < 20) {
    fprintf(err, "\n%*s^-- here\n", spcnt, "");
  } else {
    fprintf(err, "\n%*shere --^\n", spcnt - 7, "");
  }
}

/*
** Return the index of the N-th non-switch argument.  Return -1
** if N is out of range.
*/
static int argindex(int n) {
  int i;
  int dashdash = 0;
  if (lemon_argv != 0 && *lemon_argv != 0) {
    for (i = 1; lemon_argv[i]; i++) {
      if (dashdash || !ISOPT(lemon_argv[i])) {
        if (n == 0) return i;
        n--;
      }
      if (strcmp(lemon_argv[i], "--") == 0) dashdash = 1;
    }
  }
  return -1;
}

static const char emsg[] = "Command line syntax error: ";

/*
** Process a flag command line argument.
*/
static int handleflags(int i, FILE *err) {
  int v;
  int errcnt = 0;
  int j;
  for (j = 0; op[j].label; j++) {
    if (strncmp(&lemon_argv[i][1], op[j].label, lemonStrlen(op[j].label)) == 0)
      break;
  }
  v = lemon_argv[i][0] == '-' ? 1 : 0;
  if (op[j].label == 0) {
    if (err) {
      fprintf(err, "%sundefined option.\n", emsg);
      errline(i, 1, err);
    }
    errcnt++;
  } else if (op[j].arg == 0) {
    /* Ignore this option */
  } else if (op[j].type == OPT_FLAG) {
    *((int *)op[j].arg) = v;
  } else if (op[j].type == OPT_FFLAG) {
    (*(void (*)(int))(op[j].arg))(v);
  } else if (op[j].type == OPT_FSTR) {
    (*(void (*)(char *))(op[j].arg))(&lemon_argv[i][2]);
  } else {
    if (err) {
      fprintf(err, "%smissing argument on switch.\n", emsg);
      errline(i, 1, err);
    }
    errcnt++;
  }
  return errcnt;
}

/*
** Process a command line switch which has an argument.
*/
static int handleswitch(int i, FILE *err) {
  int lv = 0;
  double dv = 0.0;
  char *sv = 0, *end;
  char *cp;
  int j;
  int errcnt = 0;
  cp = strchr(lemon_argv[i], '=');
  assert(cp != 0);
  *cp = 0;
  for (j = 0; op[j].label; j++) {
    if (strcmp(lemon_argv[i], op[j].label) == 0) break;
  }
  *cp = '=';
  if (op[j].label == 0) {
    if (err) {
      fprintf(err, "%sundefined option.\n", emsg);
      errline(i, 0, err);
    }
    errcnt++;
  } else {
    cp++;
    switch (op[j].type) {
      case OPT_FLAG:
      case OPT_FFLAG:
        if (err) {
          fprintf(err, "%soption requires an argument.\n", emsg);
          errline(i, 0, err);
        }
        errcnt++;
        break;
      case OPT_DBL:
      case OPT_FDBL:
        dv = strtod(cp, &end);
        if (*end) {
          if (err) {
            fprintf(err, "%sillegal character in floating-point argument.\n",
                    emsg);
            errline(i, (int)((char *)end - (char *)lemon_argv[i]), err);
          }
          errcnt++;
        }
        break;
      case OPT_INT:
      case OPT_FINT:
        lv = strtol(cp, &end, 0);
        if (*end) {
          if (err) {
            fprintf(err, "%sillegal character in integer argument.\n", emsg);
            errline(i, (int)((char *)end - (char *)lemon_argv[i]), err);
          }
          errcnt++;
        }
        break;
      case OPT_STR:
      case OPT_FSTR:
        sv = cp;
        break;
    }
    switch (op[j].type) {
      case OPT_FLAG:
      case OPT_FFLAG:
        break;
      case OPT_DBL:
        *(double *)(op[j].arg) = dv;
        break;
      case OPT_FDBL:
        (*(void (*)(double))(op[j].arg))(dv);
        break;
      case OPT_INT:
        *(int *)(op[j].arg) = lv;
        break;
      case OPT_FINT:
        (*(void (*)(int))(op[j].arg))((int)lv);
        break;
      case OPT_STR:
        *(char **)(op[j].arg) = sv;
        break;
      case OPT_FSTR:
        (*(void (*)(char *))(op[j].arg))(sv);
        break;
    }
  }
  return errcnt;
}

int OptInit(char **a, struct s_options *o, FILE *err) {
  int errcnt = 0;
  lemon_argv = a;
  op = o;
  errstream = err;
  if (lemon_argv && *lemon_argv && op) {
    int i;
    for (i = 1; lemon_argv[i]; i++) {
      if (lemon_argv[i][0] == '+' || lemon_argv[i][0] == '-') {
        errcnt += handleflags(i, err);
      } else if (strchr(lemon_argv[i], '=')) {
        errcnt += handleswitch(i, err);
      }
    }
  }
  if (errcnt > 0) {
    fprintf(err, "Valid command line options for \"%s\" are:\n", *a);
    OptPrint();
    exit(1);
  }
  return 0;
}

int OptNArgs(void) {
  int cnt = 0;
  int dashdash = 0;
  int i;
  if (lemon_argv != 0 && lemon_argv[0] != 0) {
    for (i = 1; lemon_argv[i]; i++) {
      if (dashdash || !ISOPT(lemon_argv[i])) cnt++;
      if (strcmp(lemon_argv[i], "--") == 0) dashdash = 1;
    }
  }
  return cnt;
}

char *OptArg(int n) {
  int i;
  i = argindex(n);
  return i >= 0 ? lemon_argv[i] : 0;
}

void OptErr(int n) {
  int i;
  i = argindex(n);
  if (i >= 0) errline(i, 0, errstream);
}

void OptPrint(void) {
  int i;
  int max, len;
  max = 0;
  for (i = 0; op[i].label; i++) {
    len = lemonStrlen(op[i].label) + 1;
    switch (op[i].type) {
      case OPT_FLAG:
      case OPT_FFLAG:
        break;
      case OPT_INT:
      case OPT_FINT:
        len += 9; /* length of "<integer>" */
        break;
      case OPT_DBL:
      case OPT_FDBL:
        len += 6; /* length of "<real>" */
        break;
      case OPT_STR:
      case OPT_FSTR:
        len += 8; /* length of "<string>" */
        break;
    }
    if (len > max) max = len;
  }
  for (i = 0; op[i].label; i++) {
    switch (op[i].type) {
      case OPT_FLAG:
      case OPT_FFLAG:
        fprintf(errstream, "  -%-*s  %s\n", max, op[i].label, op[i].message);
        break;
      case OPT_INT:
      case OPT_FINT:
        fprintf(errstream, "  -%s<integer>%*s  %s\n", op[i].label,
                (int)(max - lemonStrlen(op[i].label) - 9), "", op[i].message);
        break;
      case OPT_DBL:
      case OPT_FDBL:
        fprintf(errstream, "  -%s<real>%*s  %s\n", op[i].label,
                (int)(max - lemonStrlen(op[i].label) - 6), "", op[i].message);
        break;
      case OPT_STR:
      case OPT_FSTR:
        fprintf(errstream, "  -%s<string>%*s  %s\n", op[i].label,
                (int)(max - lemonStrlen(op[i].label) - 8), "", op[i].message);
        break;
    }
  }
}

/*********************** From the file "parse.c" ****************************/
/*
** Input file parser for the LEMON parser generator.
*/

/* The state of the parser */
enum e_state {
  INITIALIZE,
  WAITING_FOR_DECL_OR_RULE,
  WAITING_FOR_DECL_KEYWORD,
  WAITING_FOR_DECL_ARG,
  WAITING_FOR_PRECEDENCE_SYMBOL,
  WAITING_FOR_ARROW,
  IN_RHS,
  LHS_ALIAS_1,
  LHS_ALIAS_2,
  LHS_ALIAS_3,
  RHS_ALIAS_1,
  RHS_ALIAS_2,
  PRECEDENCE_MARK_1,
  PRECEDENCE_MARK_2,
  RESYNC_AFTER_RULE_ERROR,
  RESYNC_AFTER_DECL_ERROR,
  WAITING_FOR_DESTRUCTOR_SYMBOL,
  WAITING_FOR_DATATYPE_SYMBOL,
  WAITING_FOR_FALLBACK_ID,
  WAITING_FOR_WILDCARD_ID,
  WAITING_FOR_CLASS_ID,
  WAITING_FOR_CLASS_TOKEN,
  WAITING_FOR_TOKEN_NAME
};

struct pstate {
  char *filename;             /* Name of the input file */
  int tokenlineno;            /* Linenumber at which current token starts */
  int errorcnt;               /* Number of errors so far */
  char *tokenstart;           /* Text of current token */
  struct lemon *gp;           /* Global state vector */
  enum e_state state;         /* The state of the parser */
  struct symbol *fallback;    /* The fallback token */
  struct symbol *tkclass;     /* Token class symbol */
  struct symbol *lhs;         /* Left-hand side of current rule */
  const char *lhsalias;       /* Alias for the LHS */
  int nrhs;                   /* Number of right-hand side symbols seen */
  struct symbol *rhs[MAXRHS]; /* RHS symbols */
  const char *alias[MAXRHS];  /* Aliases for each RHS symbol (or NULL) */
  struct rule *prevrule;      /* Previous rule parsed */
  const char *declkeyword;    /* Keyword of a declaration */
  char **declargslot;         /* Where the declaration argument should be put */
  int insertLineMacro;        /* Add #line before declaration insert */
  int *decllinenoslot;        /* Where to write declaration line number */
  enum e_assoc declassoc;     /* Assign this association to decl arguments */
  int preccounter;            /* Assign this precedence to decl arguments */
  struct rule *firstrule;     /* Pointer to first rule in the grammar */
  struct rule *lastrule;      /* Pointer to the most recently parsed rule */
};

/* Parse a single token */
static void parseonetoken(struct pstate *psp) {
  const char *x;
  x = Strsafe(psp->tokenstart); /* Save the token permanently */
#if 0
  printf("%s:%d: Token=[%s] state=%d\n",psp->filename,psp->tokenlineno,
    x,psp->state);
#endif
  switch (psp->state) {
    case INITIALIZE:
      psp->prevrule = 0;
      psp->preccounter = 0;
      psp->firstrule = psp->lastrule = 0;
      psp->gp->nrule = 0;
      /* fall through */
    case WAITING_FOR_DECL_OR_RULE:
      if (x[0] == '%') {
        psp->state = WAITING_FOR_DECL_KEYWORD;
      } else if (ISLOWER(x[0])) {
        psp->lhs = Symbol_new(x);
        psp->nrhs = 0;
        psp->lhsalias = 0;
        psp->state = WAITING_FOR_ARROW;
      } else if (x[0] == '{') {
        if (psp->prevrule == 0) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "There is no prior rule upon which to attach the code "
                   "fragment which begins on this line.");
          psp->errorcnt++;
        } else if (psp->prevrule->code != 0) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Code fragment beginning on this line is not the first "
                   "to follow the previous rule.");
          psp->errorcnt++;
        } else if (strcmp(x, "{NEVER-REDUCE") == 0) {
          psp->prevrule->neverReduce = 1;
        } else {
          psp->prevrule->line = psp->tokenlineno;
          psp->prevrule->code = &x[1];
          psp->prevrule->noCode = 0;
        }
      } else if (x[0] == '[') {
        psp->state = PRECEDENCE_MARK_1;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Token \"%s\" should be either \"%%\" or a nonterminal name.",
                 x);
        psp->errorcnt++;
      }
      break;
    case PRECEDENCE_MARK_1:
      if (!ISUPPER(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "The precedence symbol must be a terminal.");
        psp->errorcnt++;
      } else if (psp->prevrule == 0) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "There is no prior rule to assign precedence \"[%s]\".", x);
        psp->errorcnt++;
      } else if (psp->prevrule->precsym != 0) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Precedence mark on this line is not the first "
                 "to follow the previous rule.");
        psp->errorcnt++;
      } else {
        psp->prevrule->precsym = Symbol_new(x);
      }
      psp->state = PRECEDENCE_MARK_2;
      break;
    case PRECEDENCE_MARK_2:
      if (x[0] != ']') {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Missing \"]\" on precedence mark.");
        psp->errorcnt++;
      }
      psp->state = WAITING_FOR_DECL_OR_RULE;
      break;
    case WAITING_FOR_ARROW:
      if (x[0] == ':' && x[1] == ':' && x[2] == '=') {
        psp->state = IN_RHS;
      } else if (x[0] == '(') {
        psp->state = LHS_ALIAS_1;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Expected to see a \":\" following the LHS symbol \"%s\".",
                 psp->lhs->name);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case LHS_ALIAS_1:
      if (ISALPHA(x[0])) {
        psp->lhsalias = x;
        psp->state = LHS_ALIAS_2;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "\"%s\" is not a valid alias for the LHS \"%s\"\n", x,
                 psp->lhs->name);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case LHS_ALIAS_2:
      if (x[0] == ')') {
        psp->state = LHS_ALIAS_3;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Missing \")\" following LHS alias name \"%s\".",
                 psp->lhsalias);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case LHS_ALIAS_3:
      if (x[0] == ':' && x[1] == ':' && x[2] == '=') {
        psp->state = IN_RHS;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Missing \"->\" following: \"%s(%s)\".", psp->lhs->name,
                 psp->lhsalias);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case IN_RHS:
      if (x[0] == '.') {
        struct rule *rp;
        rp = (struct rule *)calloc(sizeof(struct rule) +
                                       sizeof(struct symbol *) * psp->nrhs +
                                       sizeof(char *) * psp->nrhs,
                                   1);
        if (rp == 0) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Can't allocate enough memory for this rule.");
          psp->errorcnt++;
          psp->prevrule = 0;
        } else {
          int i;
          rp->ruleline = psp->tokenlineno;
          rp->rhs = (struct symbol **)&rp[1];
          rp->rhsalias = (const char **)&(rp->rhs[psp->nrhs]);
          for (i = 0; i < psp->nrhs; i++) {
            rp->rhs[i] = psp->rhs[i];
            rp->rhsalias[i] = psp->alias[i];
            if (rp->rhsalias[i] != 0) {
              rp->rhs[i]->bContent = 1;
            }
          }
          rp->lhs = psp->lhs;
          rp->lhsalias = psp->lhsalias;
          rp->nrhs = psp->nrhs;
          rp->code = 0;
          rp->noCode = 1;
          rp->precsym = 0;
          rp->index = psp->gp->nrule++;
          rp->nextlhs = rp->lhs->rule;
          rp->lhs->rule = rp;
          rp->next = 0;
          if (psp->firstrule == 0) {
            psp->firstrule = psp->lastrule = rp;
          } else {
            psp->lastrule->next = rp;
            psp->lastrule = rp;
          }
          psp->prevrule = rp;
        }
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else if (ISALPHA(x[0])) {
        if (psp->nrhs >= MAXRHS) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Too many symbols on RHS of rule beginning at \"%s\".", x);
          psp->errorcnt++;
          psp->state = RESYNC_AFTER_RULE_ERROR;
        } else {
          psp->rhs[psp->nrhs] = Symbol_new(x);
          psp->alias[psp->nrhs] = 0;
          psp->nrhs++;
        }
      } else if ((x[0] == '|' || x[0] == '/') && psp->nrhs > 0 &&
                 ISUPPER(x[1])) {
        struct symbol *msp = psp->rhs[psp->nrhs - 1];
        if (msp->type != MULTITERMINAL) {
          struct symbol *origsp = msp;
          msp = (struct symbol *)calloc(1, sizeof(*msp));
          memset(msp, 0, sizeof(*msp));
          msp->type = MULTITERMINAL;
          msp->nsubsym = 1;
          msp->subsym = (struct symbol **)calloc(1, sizeof(struct symbol *));
          msp->subsym[0] = origsp;
          msp->name = origsp->name;
          psp->rhs[psp->nrhs - 1] = msp;
        }
        msp->nsubsym++;
        msp->subsym = (struct symbol **)realloc(
            msp->subsym, sizeof(struct symbol *) * msp->nsubsym);
        msp->subsym[msp->nsubsym - 1] = Symbol_new(&x[1]);
        if (ISLOWER(x[1]) || ISLOWER(msp->subsym[0]->name[0])) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Cannot form a compound containing a non-terminal");
          psp->errorcnt++;
        }
      } else if (x[0] == '(' && psp->nrhs > 0) {
        psp->state = RHS_ALIAS_1;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Illegal character on RHS of rule: \"%s\".", x);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case RHS_ALIAS_1:
      if (ISALPHA(x[0])) {
        psp->alias[psp->nrhs - 1] = x;
        psp->state = RHS_ALIAS_2;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "\"%s\" is not a valid alias for the RHS symbol \"%s\"\n", x,
                 psp->rhs[psp->nrhs - 1]->name);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case RHS_ALIAS_2:
      if (x[0] == ')') {
        psp->state = IN_RHS;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Missing \")\" following LHS alias name \"%s\".",
                 psp->lhsalias);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_RULE_ERROR;
      }
      break;
    case WAITING_FOR_DECL_KEYWORD:
      if (ISALPHA(x[0])) {
        psp->declkeyword = x;
        psp->declargslot = 0;
        psp->decllinenoslot = 0;
        psp->insertLineMacro = 1;
        psp->state = WAITING_FOR_DECL_ARG;
        if (strcmp(x, "name") == 0) {
          psp->declargslot = &(psp->gp->name);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "include") == 0) {
          psp->declargslot = &(psp->gp->include);
        } else if (strcmp(x, "code") == 0) {
          psp->declargslot = &(psp->gp->extracode);
        } else if (strcmp(x, "token_destructor") == 0) {
          psp->declargslot = &psp->gp->tokendest;
        } else if (strcmp(x, "default_destructor") == 0) {
          psp->declargslot = &psp->gp->vardest;
        } else if (strcmp(x, "token_prefix") == 0) {
          psp->declargslot = &psp->gp->tokenprefix;
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "syntax_error") == 0) {
          psp->declargslot = &(psp->gp->error);
        } else if (strcmp(x, "parse_accept") == 0) {
          psp->declargslot = &(psp->gp->accept);
        } else if (strcmp(x, "parse_failure") == 0) {
          psp->declargslot = &(psp->gp->failure);
        } else if (strcmp(x, "stack_overflow") == 0) {
          psp->declargslot = &(psp->gp->overflow);
        } else if (strcmp(x, "extra_argument") == 0) {
          psp->declargslot = &(psp->gp->arg);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "extra_context") == 0) {
          psp->declargslot = &(psp->gp->ctx);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "token_type") == 0) {
          psp->declargslot = &(psp->gp->tokentype);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "default_type") == 0) {
          psp->declargslot = &(psp->gp->vartype);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "stack_size") == 0) {
          psp->declargslot = &(psp->gp->stacksize);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "start_symbol") == 0) {
          psp->declargslot = &(psp->gp->start);
          psp->insertLineMacro = 0;
        } else if (strcmp(x, "left") == 0) {
          psp->preccounter++;
          psp->declassoc = LEFT;
          psp->state = WAITING_FOR_PRECEDENCE_SYMBOL;
        } else if (strcmp(x, "right") == 0) {
          psp->preccounter++;
          psp->declassoc = RIGHT;
          psp->state = WAITING_FOR_PRECEDENCE_SYMBOL;
        } else if (strcmp(x, "nonassoc") == 0) {
          psp->preccounter++;
          psp->declassoc = NONE;
          psp->state = WAITING_FOR_PRECEDENCE_SYMBOL;
        } else if (strcmp(x, "destructor") == 0) {
          psp->state = WAITING_FOR_DESTRUCTOR_SYMBOL;
        } else if (strcmp(x, "type") == 0) {
          psp->state = WAITING_FOR_DATATYPE_SYMBOL;
        } else if (strcmp(x, "fallback") == 0) {
          psp->fallback = 0;
          psp->state = WAITING_FOR_FALLBACK_ID;
        } else if (strcmp(x, "token") == 0) {
          psp->state = WAITING_FOR_TOKEN_NAME;
        } else if (strcmp(x, "wildcard") == 0) {
          psp->state = WAITING_FOR_WILDCARD_ID;
        } else if (strcmp(x, "token_class") == 0) {
          psp->state = WAITING_FOR_CLASS_ID;
        } else {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Unknown declaration keyword: \"%%%s\".", x);
          psp->errorcnt++;
          psp->state = RESYNC_AFTER_DECL_ERROR;
        }
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Illegal declaration keyword: \"%s\".", x);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      }
      break;
    case WAITING_FOR_DESTRUCTOR_SYMBOL:
      if (!ISALPHA(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Symbol name missing after %%destructor keyword");
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      } else {
        struct symbol *sp = Symbol_new(x);
        psp->declargslot = &sp->destructor;
        psp->decllinenoslot = &sp->destLineno;
        psp->insertLineMacro = 1;
        psp->state = WAITING_FOR_DECL_ARG;
      }
      break;
    case WAITING_FOR_DATATYPE_SYMBOL:
      if (!ISALPHA(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Symbol name missing after %%type keyword");
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      } else {
        struct symbol *sp = Symbol_find(x);
        if ((sp) && (sp->datatype)) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Symbol %%type \"%s\" already defined", x);
          psp->errorcnt++;
          psp->state = RESYNC_AFTER_DECL_ERROR;
        } else {
          if (!sp) {
            sp = Symbol_new(x);
          }
          psp->declargslot = &sp->datatype;
          psp->insertLineMacro = 0;
          psp->state = WAITING_FOR_DECL_ARG;
        }
      }
      break;
    case WAITING_FOR_PRECEDENCE_SYMBOL:
      if (x[0] == '.') {
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else if (ISUPPER(x[0])) {
        struct symbol *sp;
        sp = Symbol_new(x);
        if (sp->prec >= 0) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Symbol \"%s\" has already be given a precedence.", x);
          psp->errorcnt++;
        } else {
          sp->prec = psp->preccounter;
          sp->assoc = psp->declassoc;
        }
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Can't assign a precedence to \"%s\".", x);
        psp->errorcnt++;
      }
      break;
    case WAITING_FOR_DECL_ARG:
      if (x[0] == '{' || x[0] == '\"' || ISALNUM(x[0])) {
        const char *zOld, *zNew;
        char *zBuf, *z;
        int nOld, n, nLine = 0, nNew, nBack;
        int addLineMacro;
        char zLine[50];
        zNew = x;
        if (zNew[0] == '"' || zNew[0] == '{') zNew++;
        nNew = lemonStrlen(zNew);
        if (*psp->declargslot) {
          zOld = *psp->declargslot;
        } else {
          zOld = "";
        }
        nOld = lemonStrlen(zOld);
        n = nOld + nNew + 20;
        addLineMacro =
            !psp->gp->nolinenosflag && psp->insertLineMacro &&
            psp->tokenlineno > 1 &&
            (psp->decllinenoslot == 0 || psp->decllinenoslot[0] != 0);
        if (addLineMacro) {
          for (z = psp->filename, nBack = 0; *z; z++) {
            if (*z == '\\') nBack++;
          }
          lemon_sprintf(zLine, "#line %d ", psp->tokenlineno);
          nLine = lemonStrlen(zLine);
          n += nLine + lemonStrlen(psp->filename) + nBack;
        }
        *psp->declargslot = (char *)realloc(*psp->declargslot, n);
        zBuf = *psp->declargslot + nOld;
        if (addLineMacro) {
          if (nOld && zBuf[-1] != '\n') {
            *(zBuf++) = '\n';
          }
          memcpy(zBuf, zLine, nLine);
          zBuf += nLine;
          *(zBuf++) = '"';
          for (z = psp->filename; *z; z++) {
            if (*z == '\\') {
              *(zBuf++) = '\\';
            }
            *(zBuf++) = *z;
          }
          *(zBuf++) = '"';
          *(zBuf++) = '\n';
        }
        if (psp->decllinenoslot && psp->decllinenoslot[0] == 0) {
          psp->decllinenoslot[0] = psp->tokenlineno;
        }
        memcpy(zBuf, zNew, nNew);
        zBuf += nNew;
        *zBuf = 0;
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "Illegal argument to %%%s: %s", psp->declkeyword, x);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      }
      break;
    case WAITING_FOR_FALLBACK_ID:
      if (x[0] == '.') {
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else if (!ISUPPER(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "%%fallback argument \"%s\" should be a token", x);
        psp->errorcnt++;
      } else {
        struct symbol *sp = Symbol_new(x);
        if (psp->fallback == 0) {
          psp->fallback = sp;
        } else if (sp->fallback) {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "More than one fallback assigned to token %s", x);
          psp->errorcnt++;
        } else {
          sp->fallback = psp->fallback;
          psp->gp->has_fallback = 1;
        }
      }
      break;
    case WAITING_FOR_TOKEN_NAME:
      /* Tokens do not have to be declared before use.  But they can be
      ** in order to control their assigned integer number.  The number for
      ** each token is assigned when it is first seen.  So by including
      **
      **     %token ONE TWO THREE
      **
      ** early in the grammar file, that assigns small consecutive values
      ** to each of the tokens ONE TWO and THREE.
      */
      if (x[0] == '.') {
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else if (!ISUPPER(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "%%token argument \"%s\" should be a token", x);
        psp->errorcnt++;
      } else {
        (void)Symbol_new(x);
      }
      break;
    case WAITING_FOR_WILDCARD_ID:
      if (x[0] == '.') {
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else if (!ISUPPER(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "%%wildcard argument \"%s\" should be a token", x);
        psp->errorcnt++;
      } else {
        struct symbol *sp = Symbol_new(x);
        if (psp->gp->wildcard == 0) {
          psp->gp->wildcard = sp;
        } else {
          ErrorMsg(psp->filename, psp->tokenlineno,
                   "Extra wildcard to token: %s", x);
          psp->errorcnt++;
        }
      }
      break;
    case WAITING_FOR_CLASS_ID:
      if (!ISLOWER(x[0])) {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "%%token_class must be followed by an identifier: %s", x);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      } else if (Symbol_find(x)) {
        ErrorMsg(psp->filename, psp->tokenlineno, "Symbol \"%s\" already used",
                 x);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      } else {
        psp->tkclass = Symbol_new(x);
        psp->tkclass->type = MULTITERMINAL;
        psp->state = WAITING_FOR_CLASS_TOKEN;
      }
      break;
    case WAITING_FOR_CLASS_TOKEN:
      if (x[0] == '.') {
        psp->state = WAITING_FOR_DECL_OR_RULE;
      } else if (ISUPPER(x[0]) ||
                 ((x[0] == '|' || x[0] == '/') && ISUPPER(x[1]))) {
        struct symbol *msp = psp->tkclass;
        msp->nsubsym++;
        msp->subsym = (struct symbol **)realloc(
            msp->subsym, sizeof(struct symbol *) * msp->nsubsym);
        if (!ISUPPER(x[0])) x++;
        msp->subsym[msp->nsubsym - 1] = Symbol_new(x);
      } else {
        ErrorMsg(psp->filename, psp->tokenlineno,
                 "%%token_class argument \"%s\" should be a token", x);
        psp->errorcnt++;
        psp->state = RESYNC_AFTER_DECL_ERROR;
      }
      break;
    case RESYNC_AFTER_RULE_ERROR:
      /*      if( x[0]=='.' ) psp->state = WAITING_FOR_DECL_OR_RULE;
      **      break; */
    case RESYNC_AFTER_DECL_ERROR:
      if (x[0] == '.') psp->state = WAITING_FOR_DECL_OR_RULE;
      if (x[0] == '%') psp->state = WAITING_FOR_DECL_KEYWORD;
      break;
  }
}

/* The text in the input is part of the argument to an %ifdef or %ifndef.
** Evaluate the text as a boolean expression.  Return true or false.
*/
static int eval_preprocessor_boolean(char *z, int lineno) {
  int neg = 0;
  int res = 0;
  int okTerm = 1;
  int i;
  for (i = 0; z[i] != 0; i++) {
    if (ISSPACE(z[i])) continue;
    if (z[i] == '!') {
      if (!okTerm) goto pp_syntax_error;
      neg = !neg;
      continue;
    }
    if (z[i] == '|' && z[i + 1] == '|') {
      if (okTerm) goto pp_syntax_error;
      if (res) return 1;
      i++;
      okTerm = 1;
      continue;
    }
    if (z[i] == '&' && z[i + 1] == '&') {
      if (okTerm) goto pp_syntax_error;
      if (!res) return 0;
      i++;
      okTerm = 1;
      continue;
    }
    if (z[i] == '(') {
      int k;
      int n = 1;
      if (!okTerm) goto pp_syntax_error;
      for (k = i + 1; z[k]; k++) {
        if (z[k] == ')') {
          n--;
          if (n == 0) {
            z[k] = 0;
            res = eval_preprocessor_boolean(&z[i + 1], -1);
            z[k] = ')';
            if (res < 0) {
              i = i - res;
              goto pp_syntax_error;
            }
            i = k;
            break;
          }
        } else if (z[k] == '(') {
          n++;
        } else if (z[k] == 0) {
          i = k;
          goto pp_syntax_error;
        }
      }
      if (neg) {
        res = !res;
        neg = 0;
      }
      okTerm = 0;
      continue;
    }
    if (ISALPHA(z[i])) {
      int j, k, n;
      if (!okTerm) goto pp_syntax_error;
      for (k = i + 1; ISALNUM(z[k]) || z[k] == '_'; k++) {
      }
      n = k - i;
      res = 0;
      for (j = 0; j < nDefine; j++) {
        if (strncmp(azDefine[j], &z[i], n) == 0 && azDefine[j][n] == 0) {
          res = 1;
          break;
        }
      }
      i = k - 1;
      if (neg) {
        res = !res;
        neg = 0;
      }
      okTerm = 0;
      continue;
    }
    goto pp_syntax_error;
  }
  return res;

pp_syntax_error:
  if (lineno > 0) {
    fprintf(stderr, "%%if syntax error on line %d.\n", lineno);
    fprintf(stderr, "  %.*s <-- syntax error here\n", i + 1, z);
    exit(1);
  } else {
    return -(i + 1);
  }
}

/* Run the preprocessor over the input file text.  The global variables
** azDefine[0] through azDefine[nDefine-1] contains the names of all defined
** macros.  This routine looks for "%ifdef" and "%ifndef" and "%endif" and
** comments them out.  Text in between is also commented out as appropriate.
*/
static void preprocess_input(char *z) {
  int i, j, k;
  int exclude = 0;
  int start = 0;
  int lineno = 1;
  int start_lineno = 1;
  for (i = 0; z[i]; i++) {
    if (z[i] == '\n') lineno++;
    if (z[i] != '%' || (i > 0 && z[i - 1] != '\n')) continue;
    if (strncmp(&z[i], "%endif", 6) == 0 && ISSPACE(z[i + 6])) {
      if (exclude) {
        exclude--;
        if (exclude == 0) {
          for (j = start; j < i; j++)
            if (z[j] != '\n') z[j] = ' ';
        }
      }
      for (j = i; z[j] && z[j] != '\n'; j++) z[j] = ' ';
    } else if (strncmp(&z[i], "%else", 5) == 0 && ISSPACE(z[i + 5])) {
      if (exclude == 1) {
        exclude = 0;
        for (j = start; j < i; j++)
          if (z[j] != '\n') z[j] = ' ';
      } else if (exclude == 0) {
        exclude = 1;
        start = i;
        start_lineno = lineno;
      }
      for (j = i; z[j] && z[j] != '\n'; j++) z[j] = ' ';
    } else if (strncmp(&z[i], "%ifdef ", 7) == 0 ||
               strncmp(&z[i], "%if ", 4) == 0 ||
               strncmp(&z[i], "%ifndef ", 8) == 0) {
      if (exclude) {
        exclude++;
      } else {
        int isNot;
        int iBool;
        for (j = i; z[j] && !ISSPACE(z[j]); j++) {
        }
        iBool = j;
        isNot = (j == i + 7);
        while (z[j] && z[j] != '\n') {
          j++;
        }
        k = z[j];
        z[j] = 0;
        exclude = eval_preprocessor_boolean(&z[iBool], lineno);
        z[j] = k;
        if (!isNot) exclude = !exclude;
        if (exclude) {
          start = i;
          start_lineno = lineno;
        }
      }
      for (j = i; z[j] && z[j] != '\n'; j++) z[j] = ' ';
    }
  }
  if (exclude) {
    fprintf(stderr, "unterminated %%ifdef starting on line %d\n", start_lineno);
    exit(1);
  }
}

/* In spite of its name, this function is really a scanner.  It read
** in the entire input file (all at once) then tokenizes it.  Each
** token is passed to the function "parseonetoken" which builds all
** the appropriate data structures in the global state vector "gp".
*/
void Parse(struct lemon *gp) {
  struct pstate *ps;
  FILE *fp;
  char *filebuf;
  unsigned int filesize;
  int lineno;
  int c;
  char *cp, *nextcp;
  int startline = 0;

  ps = gc(xcalloc(1, sizeof(struct pstate)));
  ps->gp = gp;
  ps->filename = gp->filename;
  ps->errorcnt = 0;
  ps->state = INITIALIZE;

  /* Begin by reading the input file */
  fp = fopen(ps->filename, "rb");
  if (fp == 0) {
    ErrorMsg(ps->filename, 0, "Can't open this file for reading.");
    gp->errorcnt++;
    return;
  }
  fseek(fp, 0, 2);
  filesize = ftell(fp);
  rewind(fp);
  filebuf = (char *)malloc(filesize + 1);
  if (filesize > 100000000 || filebuf == 0) {
    ErrorMsg(ps->filename, 0, "Input file too large.");
    free(filebuf);
    gp->errorcnt++;
    fclose(fp);
    return;
  }
  if (fread(filebuf, 1, filesize, fp) != filesize) {
    ErrorMsg(ps->filename, 0, "Can't read in all %d bytes of this file.",
             filesize);
    free(filebuf);
    gp->errorcnt++;
    fclose(fp);
    return;
  }
  fclose(fp);
  filebuf[filesize] = 0;

  /* Make an initial pass through the file to handle %ifdef and %ifndef */
  preprocess_input(filebuf);
  if (gp->printPreprocessed) {
    printf("%s\n", filebuf);
    return;
  }

  /* Now scan the text of the input file */
  lineno = 1;
  for (cp = filebuf; (c = *cp) != 0;) {
    if (c == '\n') lineno++; /* Keep track of the line number */
    if (ISSPACE(c)) {
      cp++;
      continue;
    }                               /* Skip all white space */
    if (c == '/' && cp[1] == '/') { /* Skip C++ style comments */
      cp += 2;
      while ((c = *cp) != 0 && c != '\n') cp++;
      continue;
    }
    if (c == '/' && cp[1] == '*') { /* Skip C style comments */
      cp += 2;
      while ((c = *cp) != 0 && (c != '/' || cp[-1] != '*')) {
        if (c == '\n') lineno++;
        cp++;
      }
      if (c) cp++;
      continue;
    }
    ps->tokenstart = cp;      /* Mark the beginning of the token */
    ps->tokenlineno = lineno; /* Linenumber on which token begins */
    if (c == '\"') {          /* String literals */
      cp++;
      while ((c = *cp) != 0 && c != '\"') {
        if (c == '\n') lineno++;
        cp++;
      }
      if (c == 0) {
        ErrorMsg(ps->filename, startline,
                 "String starting on this line is not terminated before "
                 "the end of the file.");
        ps->errorcnt++;
        nextcp = cp;
      } else {
        nextcp = cp + 1;
      }
    } else if (c == '{') { /* A block of C code */
      int level;
      cp++;
      for (level = 1; (c = *cp) != 0 && (level > 1 || c != '}'); cp++) {
        if (c == '\n')
          lineno++;
        else if (c == '{')
          level++;
        else if (c == '}')
          level--;
        else if (c == '/' && cp[1] == '*') { /* Skip comments */
          int prevc;
          cp = &cp[2];
          prevc = 0;
          while ((c = *cp) != 0 && (c != '/' || prevc != '*')) {
            if (c == '\n') lineno++;
            prevc = c;
            cp++;
          }
        } else if (c == '/' && cp[1] == '/') { /* Skip C++ style comments too */
          cp = &cp[2];
          while ((c = *cp) != 0 && c != '\n') cp++;
          if (c) lineno++;
        } else if (c == '\'' || c == '\"') { /* String a character literals */
          int startchar, prevc;
          startchar = c;
          prevc = 0;
          for (cp++; (c = *cp) != 0 && (c != startchar || prevc == '\\');
               cp++) {
            if (c == '\n') lineno++;
            if (prevc == '\\')
              prevc = 0;
            else
              prevc = c;
          }
        }
      }
      if (c == 0) {
        ErrorMsg(ps->filename, ps->tokenlineno,
                 "C code starting on this line is not terminated before "
                 "the end of the file.");
        ps->errorcnt++;
        nextcp = cp;
      } else {
        nextcp = cp + 1;
      }
    } else if (ISALNUM(c)) { /* Identifiers */
      while ((c = *cp) != 0 && (ISALNUM(c) || c == '_')) cp++;
      nextcp = cp;
    } else if (c == ':' && cp[1] == ':' &&
               cp[2] == '=') { /* The operator "::=" */
      cp += 3;
      nextcp = cp;
    } else if ((c == '/' || c == '|') && ISALPHA(cp[1])) {
      cp += 2;
      while ((c = *cp) != 0 && (ISALNUM(c) || c == '_')) cp++;
      nextcp = cp;
    } else { /* All other (one character) operators */
      cp++;
      nextcp = cp;
    }
    c = *cp;
    *cp = 0;           /* Null terminate the token */
    parseonetoken(ps); /* Parse the token */
    *cp = (char)c;     /* Restore the buffer */
    cp = nextcp;
  }
  free(filebuf); /* Release the buffer after parsing */
  gp->rule = ps->firstrule;
  gp->errorcnt = ps->errorcnt;
}

/*************************** From the file "plink.c" *********************/
/*
** Routines processing configuration follow-set propagation links
** in the LEMON parser generator.
*/
static struct plink *plink_freelist = 0;

/* Allocate a new plink */
struct plink *Plink_new(void) {
  struct plink *newlink;

  if (plink_freelist == 0) {
    int i;
    int amt = 100;
    plink_freelist = (struct plink *)calloc(amt, sizeof(struct plink));
    if (plink_freelist == 0) {
      fprintf(
          stderr,
          "Unable to allocate memory for a new follow-set propagation link.\n");
      exit(1);
    }
    for (i = 0; i < amt - 1; i++)
      plink_freelist[i].next = &plink_freelist[i + 1];
    plink_freelist[amt - 1].next = 0;
  }
  newlink = plink_freelist;
  plink_freelist = plink_freelist->next;
  return newlink;
}

/* Add a plink to a plink list */
void Plink_add(struct plink **plpp, struct config *cfp) {
  struct plink *newlink;
  newlink = Plink_new();
  newlink->next = *plpp;
  *plpp = newlink;
  newlink->cfp = cfp;
}

/* Transfer every plink on the list "from" to the list "to" */
void Plink_copy(struct plink **to, struct plink *from) {
  struct plink *nextpl;
  while (from) {
    nextpl = from->next;
    from->next = *to;
    *to = from;
    from = nextpl;
  }
}

/* Delete every plink on the list */
void Plink_delete(struct plink *plp) {
  struct plink *nextpl;

  while (plp) {
    nextpl = plp->next;
    plp->next = plink_freelist;
    plink_freelist = plp;
    plp = nextpl;
  }
}

/*********************** From the file "report.c" **************************/
/*
** Procedures for generating reports and tables in the LEMON parser generator.
*/

/* Generate a filename with the given suffix.  Space to hold the
** name comes from malloc() and must be freed by the calling
** function.
*/
PRIVATE char *file_makename(struct lemon *lemp, const char *suffix) {
  char *name;
  char *cp;
  char *filename = lemp->filename;
  int sz;

  if (outputDir) {
    cp = strrchr(filename, '/');
    if (cp) filename = cp + 1;
  }
  sz = lemonStrlen(filename);
  sz += lemonStrlen(suffix);
  if (outputDir) sz += lemonStrlen(outputDir) + 1;
  sz += 5;
  name = (char *)malloc(sz);
  if (name == 0) {
    fprintf(stderr, "Can't allocate space for a filename.\n");
    exit(1);
  }
  name[0] = 0;
  if (outputDir) {
    lemon_strcpy(name, outputDir);
    lemon_strcat(name, "/");
  }
  lemon_strcat(name, filename);
  cp = strrchr(name, '.');
  if (cp) *cp = 0;
  lemon_strcat(name, suffix);
  return name;
}

/* Open a file with a name based on the name of the input file,
** but with a different (specified) suffix, and return a pointer
** to the stream */
PRIVATE FILE *file_open(struct lemon *lemp, const char *suffix,
                        const char *mode) {
  FILE *fp;

  if (lemp->outname) free(lemp->outname);
  lemp->outname = file_makename(lemp, suffix);
  fp = fopen(lemp->outname, mode);
  if (fp == 0 && *mode == 'w') {
    fprintf(stderr, "Can't open file \"%s\".\n", lemp->outname);
    lemp->errorcnt++;
    return 0;
  }
  return fp;
}

/* Print the text of a rule
 */
void rule_print(FILE *out, struct rule *rp) {
  int i, j;
  fprintf(out, "%s", rp->lhs->name);
  /*    if( rp->lhsalias ) fprintf(out,"(%s)",rp->lhsalias); */
  fprintf(out, " ::=");
  for (i = 0; i < rp->nrhs; i++) {
    struct symbol *sp = rp->rhs[i];
    if (sp->type == MULTITERMINAL) {
      fprintf(out, " %s", sp->subsym[0]->name);
      for (j = 1; j < sp->nsubsym; j++) {
        fprintf(out, "|%s", sp->subsym[j]->name);
      }
    } else {
      fprintf(out, " %s", sp->name);
    }
    /* if( rp->rhsalias[i] ) fprintf(out,"(%s)",rp->rhsalias[i]); */
  }
}

/* Duplicate the input file without comments and without actions
** on rules */
void Reprint(struct lemon *lemp) {
  struct rule *rp;
  struct symbol *sp;
  int i, j, maxlen, len, ncolumns, skip;
  printf("// Reprint of input file \"%s\".\n// Symbols:\n", lemp->filename);
  maxlen = 10;
  for (i = 0; i < lemp->nsymbol; i++) {
    sp = lemp->symbols[i];
    len = lemonStrlen(sp->name);
    if (len > maxlen) maxlen = len;
  }
  ncolumns = 76 / (maxlen + 5);
  if (ncolumns < 1) ncolumns = 1;
  skip = (lemp->nsymbol + ncolumns - 1) / ncolumns;
  for (i = 0; i < skip; i++) {
    printf("//");
    for (j = i; j < lemp->nsymbol; j += skip) {
      sp = lemp->symbols[j];
      assert(sp->index == j);
      printf(" %3d %-*.*s", j, maxlen, maxlen, sp->name);
    }
    printf("\n");
  }
  for (rp = lemp->rule; rp; rp = rp->next) {
    rule_print(stdout, rp);
    printf(".");
    if (rp->precsym) printf(" [%s]", rp->precsym->name);
    /* if( rp->code ) printf("\n    %s",rp->code); */
    printf("\n");
  }
}

/* Print a single rule.
 */
void RulePrint(FILE *fp, struct rule *rp, int iCursor) {
  struct symbol *sp;
  int i, j;
  fprintf(fp, "%s ::=", rp->lhs->name);
  for (i = 0; i <= rp->nrhs; i++) {
    if (i == iCursor) fprintf(fp, " *");
    if (i == rp->nrhs) break;
    sp = rp->rhs[i];
    if (sp->type == MULTITERMINAL) {
      fprintf(fp, " %s", sp->subsym[0]->name);
      for (j = 1; j < sp->nsubsym; j++) {
        fprintf(fp, "|%s", sp->subsym[j]->name);
      }
    } else {
      fprintf(fp, " %s", sp->name);
    }
  }
}

/* Print the rule for a configuration.
 */
void ConfigPrint(FILE *fp, struct config *cfp) {
  RulePrint(fp, cfp->rp, cfp->dot);
}

/* #define TEST */
#if 0
/* Print a set */
PRIVATE void SetPrint(out,set,lemp)
FILE *out;
char *set;
struct lemon *lemp;
{
  int i;
  char *spacer;
  spacer = "";
  fprintf(out,"%12s[","");
  for(i=0; i<lemp->nterminal; i++){
    if( SetFind(set,i) ){
      fprintf(out,"%s%s",spacer,lemp->symbols[i]->name);
      spacer = " ";
    }
  }
  fprintf(out,"]\n");
}

/* Print a plink chain */
PRIVATE void PlinkPrint(out,plp,tag)
FILE *out;
struct plink *plp;
char *tag;
{
  while( plp ){
    fprintf(out,"%12s%s (state %2d) ","",tag,plp->cfp->stp->statenum);
    ConfigPrint(out,plp->cfp);
    fprintf(out,"\n");
    plp = plp->next;
  }
}
#endif

/* Print an action to the given file descriptor.  Return FALSE if
** nothing was actually printed.
*/
int PrintAction(struct action *ap, /* The action to print */
                FILE *fp,          /* Print the action here */
                int indent         /* Indent by this amount */
) {
  int result = 1;
  switch (ap->type) {
    case SHIFT: {
      struct state *stp = ap->x.stp;
      fprintf(fp, "%*s shift        %-7d", indent, ap->sp->name, stp->statenum);
      break;
    }
    case REDUCE: {
      struct rule *rp = ap->x.rp;
      fprintf(fp, "%*s reduce       %-7d", indent, ap->sp->name, rp->iRule);
      RulePrint(fp, rp, -1);
      break;
    }
    case SHIFTREDUCE: {
      struct rule *rp = ap->x.rp;
      fprintf(fp, "%*s shift-reduce %-7d", indent, ap->sp->name, rp->iRule);
      RulePrint(fp, rp, -1);
      break;
    }
    case ACCEPT:
      fprintf(fp, "%*s accept", indent, ap->sp->name);
      break;
    case ERROR:
      fprintf(fp, "%*s error", indent, ap->sp->name);
      break;
    case SRCONFLICT:
    case RRCONFLICT:
      fprintf(fp, "%*s reduce       %-7d ** Parsing conflict **", indent,
              ap->sp->name, ap->x.rp->iRule);
      break;
    case SSCONFLICT:
      fprintf(fp, "%*s shift        %-7d ** Parsing conflict **", indent,
              ap->sp->name, ap->x.stp->statenum);
      break;
    case SH_RESOLVED:
      if (showPrecedenceConflict) {
        fprintf(fp, "%*s shift        %-7d -- dropped by precedence", indent,
                ap->sp->name, ap->x.stp->statenum);
      } else {
        result = 0;
      }
      break;
    case RD_RESOLVED:
      if (showPrecedenceConflict) {
        fprintf(fp, "%*s reduce %-7d -- dropped by precedence", indent,
                ap->sp->name, ap->x.rp->iRule);
      } else {
        result = 0;
      }
      break;
    case NOT_USED:
      result = 0;
      break;
  }
  if (result && ap->spOpt) {
    fprintf(fp, "  /* because %s==%s */", ap->sp->name, ap->spOpt->name);
  }
  return result;
}

/* Generate the "*.out" log file */
void ReportOutput(struct lemon *lemp) {
  int i, n;
  struct state *stp;
  struct config *cfp;
  struct action *ap;
  struct rule *rp;
  FILE *fp;

  fp = file_open(lemp, ".out", "wb");
  if (fp == 0) return;
  for (i = 0; i < lemp->nxstate; i++) {
    stp = lemp->sorted[i];
    fprintf(fp, "State %d:\n", stp->statenum);
    if (lemp->basisflag)
      cfp = stp->bp;
    else
      cfp = stp->cfp;
    while (cfp) {
      char buf[20];
      if (cfp->dot == cfp->rp->nrhs) {
        lemon_sprintf(buf, "(%d)", cfp->rp->iRule);
        fprintf(fp, "    %5s ", buf);
      } else {
        fprintf(fp, "          ");
      }
      ConfigPrint(fp, cfp);
      fprintf(fp, "\n");
#if 0
      SetPrint(fp,cfp->fws,lemp);
      PlinkPrint(fp,cfp->fplp,"To  ");
      PlinkPrint(fp,cfp->bplp,"From");
#endif
      if (lemp->basisflag)
        cfp = cfp->bp;
      else
        cfp = cfp->next;
    }
    fprintf(fp, "\n");
    for (ap = stp->ap; ap; ap = ap->next) {
      if (PrintAction(ap, fp, 30)) fprintf(fp, "\n");
    }
    fprintf(fp, "\n");
  }
  fprintf(fp, "----------------------------------------------------\n");
  fprintf(fp, "Symbols:\n");
  fprintf(fp, "The first-set of non-terminals is shown after the name.\n\n");
  for (i = 0; i < lemp->nsymbol; i++) {
    int j;
    struct symbol *sp;

    sp = lemp->symbols[i];
    fprintf(fp, "  %3d: %s", i, sp->name);
    if (sp->type == NONTERMINAL) {
      fprintf(fp, ":");
      if (sp->lambda) {
        fprintf(fp, " <lambda>");
      }
      for (j = 0; j < lemp->nterminal; j++) {
        if (sp->firstset && SetFind(sp->firstset, j)) {
          fprintf(fp, " %s", lemp->symbols[j]->name);
        }
      }
    }
    if (sp->prec >= 0) fprintf(fp, " (precedence=%d)", sp->prec);
    fprintf(fp, "\n");
  }
  fprintf(fp, "----------------------------------------------------\n");
  fprintf(fp, "Syntax-only Symbols:\n");
  fprintf(fp, "The following symbols never carry semantic content.\n\n");
  for (i = n = 0; i < lemp->nsymbol; i++) {
    int w;
    struct symbol *sp = lemp->symbols[i];
    if (sp->bContent) continue;
    w = (int)strlen(sp->name);
    if (n > 0 && n + w > 75) {
      fprintf(fp, "\n");
      n = 0;
    }
    if (n > 0) {
      fprintf(fp, " ");
      n++;
    }
    fprintf(fp, "%s", sp->name);
    n += w;
  }
  if (n > 0) fprintf(fp, "\n");
  fprintf(fp, "----------------------------------------------------\n");
  fprintf(fp, "Rules:\n");
  for (rp = lemp->rule; rp; rp = rp->next) {
    fprintf(fp, "%4d: ", rp->iRule);
    rule_print(fp, rp);
    fprintf(fp, ".");
    if (rp->precsym) {
      fprintf(fp, " [%s precedence=%d]", rp->precsym->name, rp->precsym->prec);
    }
    fprintf(fp, "\n");
  }
  fclose(fp);
  return;
}

/* Search for the file "name" which is in the same directory as
** the exacutable */
PRIVATE char *pathsearch(char *argv0, char *name, int modemask) {
  const char *pathlist;
  char *pathbufptr = 0;
  char *pathbuf = 0;
  char *path, *cp;
  char c;

#ifdef __WIN32__
  cp = strrchr(argv0, '\\');
#else
  cp = strrchr(argv0, '/');
#endif
  if (cp) {
    c = *cp;
    *cp = 0;
    path = (char *)malloc(lemonStrlen(argv0) + lemonStrlen(name) + 2);
    if (path) lemon_sprintf(path, "%s/%s", argv0, name);
    *cp = c;
  } else {
    pathlist = getenv("PATH");
    if (pathlist == 0) pathlist = ".:/bin:/usr/bin";
    pathbuf = (char *)malloc(lemonStrlen(pathlist) + 1);
    path = (char *)malloc(lemonStrlen(pathlist) + lemonStrlen(name) + 2);
    if ((pathbuf != 0) && (path != 0)) {
      pathbufptr = pathbuf;
      lemon_strcpy(pathbuf, pathlist);
      while (*pathbuf) {
        cp = strchr(pathbuf, ':');
        if (cp == 0) cp = &pathbuf[lemonStrlen(pathbuf)];
        c = *cp;
        *cp = 0;
        lemon_sprintf(path, "%s/%s", pathbuf, name);
        *cp = c;
        if (c == 0)
          pathbuf[0] = 0;
        else
          pathbuf = &cp[1];
        if (access(path, modemask) == 0) break;
      }
    }
    free(pathbufptr);
  }
  return path;
}

/* Given an action, compute the integer value for that action
** which is to be put in the action table of the generated machine.
** Return negative if no action should be generated.
*/
PRIVATE int compute_action(struct lemon *lemp, struct action *ap) {
  int act;
  switch (ap->type) {
    case SHIFT:
      act = ap->x.stp->statenum;
      break;
    case SHIFTREDUCE: {
      /* Since a SHIFT is inherient after a prior REDUCE, convert any
      ** SHIFTREDUCE action with a nonterminal on the LHS into a simple
      ** REDUCE action: */
      if (ap->sp->index >= lemp->nterminal) {
        act = lemp->minReduce + ap->x.rp->iRule;
      } else {
        act = lemp->minShiftReduce + ap->x.rp->iRule;
      }
      break;
    }
    case REDUCE:
      act = lemp->minReduce + ap->x.rp->iRule;
      break;
    case ERROR:
      act = lemp->errAction;
      break;
    case ACCEPT:
      act = lemp->accAction;
      break;
    default:
      act = -1;
      break;
  }
  return act;
}

#define LINESIZE 1000
/* The next cluster of routines are for reading the template file
** and writing the results to the generated parser */
/* The first function transfers data from "in" to "out" until
** a line is seen which begins with "%%".  The line number is
** tracked.
**
** if name!=0, then any word that begin with "Parse" is changed to
** begin with *name instead.
*/
PRIVATE void tplt_xfer(char *name, FILE *in, FILE *out, int *lineno) {
  int i, iStart;
  char *line = gc(xmalloc(LINESIZE));
  while (fgets(line, LINESIZE, in) && (line[0] != '%' || line[1] != '%')) {
    (*lineno)++;
    iStart = 0;
    if (name) {
      for (i = 0; line[i]; i++) {
        if (line[i] == 'P' && strncmp(&line[i], "Parse", 5) == 0 &&
            (i == 0 || !ISALPHA(line[i - 1]))) {
          if (i > iStart) fprintf(out, "%.*s", i - iStart, &line[iStart]);
          fprintf(out, "%s", name);
          i += 4;
          iStart = i + 1;
        }
      }
    }
    fprintf(out, "%s", &line[iStart]);
  }
}

/* Skip forward past the header of the template file to the first "%%"
 */
PRIVATE void tplt_skip_header(FILE *in, int *lineno) {
  char *line = gc(xmalloc(LINESIZE));
  while (fgets(line, LINESIZE, in) && (line[0] != '%' || line[1] != '%')) {
    (*lineno)++;
  }
}

/* The next function finds the template file and opens it, returning
** a pointer to the opened file. */
PRIVATE FILE *tplt_open(struct lemon *lemp) {
  static const char templatename[] = "third_party/lemon/lempar.c.txt";
  char *buf;
  FILE *in;
  char *tpltname;
  char *toFree = 0;
  char *cp;

  buf = gc(xmalloc(1000));

  /* first, see if user specified a template filename on the command line. */
  if (user_templatename != 0) {
    if (access(user_templatename, 004) == -1) {
      fprintf(stderr, "Can't find the parser driver template file \"%s\".\n",
              user_templatename);
      lemp->errorcnt++;
      return 0;
    }
    in = fopen(user_templatename, "rb");
    if (in == 0) {
      fprintf(stderr, "Can't open the template file \"%s\".\n",
              user_templatename);
      lemp->errorcnt++;
      return 0;
    }
    return in;
  }

  cp = strrchr(lemp->filename, '.');
  if (cp) {
    lemon_sprintf(buf, "%.*s.lt", (int)(cp - lemp->filename), lemp->filename);
  } else {
    lemon_sprintf(buf, "%s.lt", lemp->filename);
  }
  if (access(buf, 004) == 0) {
    tpltname = buf;
  } else if (access(templatename, 004) == 0) {
    tpltname = templatename;
  } else {
    toFree = tpltname = pathsearch(lemp->argv0, templatename, 0);
  }
  if (tpltname == 0) {
    fprintf(stderr, "Can't find the parser driver template file \"%s\".\n",
            templatename);
    lemp->errorcnt++;
    return 0;
  }
  in = fopen(tpltname, "rb");
  if (in == 0) {
    fprintf(stderr, "Can't open the template file \"%s\".\n", tpltname);
    lemp->errorcnt++;
  }
  free(toFree);
  return in;
}

/* Print a #line directive line to the output file. */
PRIVATE void tplt_linedir(FILE *out, int lineno, char *filename) {
  fprintf(out, "#line %d \"", lineno);
  while (*filename) {
    if (*filename == '\\') putc('\\', out);
    putc(*filename, out);
    filename++;
  }
  fprintf(out, "\"\n");
}

/* Print a string to the file and keep the linenumber up to date */
PRIVATE void tplt_print(FILE *out, struct lemon *lemp, char *str, int *lineno) {
  if (str == 0) return;
  while (*str) {
    putc(*str, out);
    if (*str == '\n') (*lineno)++;
    str++;
  }
  if (str[-1] != '\n') {
    putc('\n', out);
    (*lineno)++;
  }
  if (!lemp->nolinenosflag) {
    (*lineno)++;
    tplt_linedir(out, *lineno, lemp->outname);
  }
  return;
}

/*
** The following routine emits code for the destructor for the
** symbol sp
*/
void emit_destructor_code(FILE *out, struct symbol *sp, struct lemon *lemp,
                          int *lineno) {
  char *cp = 0;

  if (sp->type == TERMINAL) {
    cp = lemp->tokendest;
    if (cp == 0) return;
    fprintf(out, "{\n");
    (*lineno)++;
  } else if (sp->destructor) {
    cp = sp->destructor;
    fprintf(out, "{\n");
    (*lineno)++;
    if (!lemp->nolinenosflag) {
      (*lineno)++;
      tplt_linedir(out, sp->destLineno, lemp->filename);
    }
  } else if (lemp->vardest) {
    cp = lemp->vardest;
    if (cp == 0) return;
    fprintf(out, "{\n");
    (*lineno)++;
  } else {
    assert(0); /* Cannot happen */
  }
  for (; *cp; cp++) {
    if (*cp == '$' && cp[1] == '$') {
      fprintf(out, "(yypminor->yy%d)", sp->dtnum);
      cp++;
      continue;
    }
    if (*cp == '\n') (*lineno)++;
    fputc(*cp, out);
  }
  fprintf(out, "\n");
  (*lineno)++;
  if (!lemp->nolinenosflag) {
    (*lineno)++;
    tplt_linedir(out, *lineno, lemp->outname);
  }
  fprintf(out, "}\n");
  (*lineno)++;
  return;
}

/*
** Return TRUE (non-zero) if the given symbol has a destructor.
*/
int has_destructor(struct symbol *sp, struct lemon *lemp) {
  int ret;
  if (sp->type == TERMINAL) {
    ret = lemp->tokendest != 0;
  } else {
    ret = lemp->vardest != 0 || sp->destructor != 0;
  }
  return ret;
}

/*
** Append text to a dynamically allocated string.  If zText is 0 then
** reset the string to be empty again.  Always return the complete text
** of the string (which is overwritten with each call).
**
** n bytes of zText are stored.  If n==0 then all of zText up to the first
** \000 terminator is stored.  zText can contain up to two instances of
** %d.  The values of p1 and p2 are written into the first and second
** %d.
**
** If n==-1, then the previous character is overwritten.
*/
PRIVATE char *append_str(const char *zText, int n, int p1, int p2) {
  static char empty[1] = {0};
  static char *z = 0;
  static int alloced = 0;
  static int used = 0;
  int c;
  char zInt[40];
  if (zText == 0) {
    if (used == 0 && z != 0) z[0] = 0;
    used = 0;
    return z;
  }
  if (n <= 0) {
    if (n < 0) {
      used += n;
      assert(used >= 0);
    }
    n = lemonStrlen(zText);
  }
  if ((int)(n + sizeof(zInt) * 2 + used) >= alloced) {
    alloced = n + sizeof(zInt) * 2 + used + 200;
    z = (char *)realloc(z, alloced);
  }
  if (z == 0) return empty;
  while (n-- > 0) {
    c = *(zText++);
    if (c == '%' && n > 0 && zText[0] == 'd') {
      lemon_sprintf(zInt, "%d", p1);
      p1 = p2;
      lemon_strcpy(&z[used], zInt);
      used += lemonStrlen(&z[used]);
      zText++;
      n--;
    } else {
      z[used++] = (char)c;
    }
  }
  z[used] = 0;
  return z;
}

/*
** Write and transform the rp->code string so that symbols are expanded.
** Populate the rp->codePrefix and rp->codeSuffix strings, as appropriate.
**
** Return 1 if the expanded code requires that "yylhsminor" local variable
** to be defined.
*/
PRIVATE int translate_code(struct lemon *lemp, struct rule *rp) {
  char *cp, *xp;
  int i;
  int rc = 0;            /* True if yylhsminor is used */
  int dontUseRhs0 = 0;   /* If true, use of left-most RHS label is illegal */
  const char *zSkip = 0; /* The zOvwrt comment within rp->code, or NULL */
  char lhsused = 0;      /* True if the LHS element has been used */
  char lhsdirect;        /* True if LHS writes directly into stack */
  char used[MAXRHS];     /* True for each RHS element which is used */
  char zLhs[50];         /* Convert the LHS symbol into this string */
  char zOvwrt[900];      /* Comment that to allow LHS to overwrite RHS */

  for (i = 0; i < rp->nrhs; i++) used[i] = 0;
  lhsused = 0;

  if (rp->code == 0) {
    static const char newlinestr[2] = {'\n', '\0'};
    rp->code = newlinestr;
    rp->line = rp->ruleline;
    rp->noCode = 1;
  } else {
    rp->noCode = 0;
  }

  if (rp->nrhs == 0) {
    /* If there are no RHS symbols, then writing directly to the LHS is ok */
    lhsdirect = 1;
  } else if (rp->rhsalias[0] == 0) {
    /* The left-most RHS symbol has no value.  LHS direct is ok.  But
    ** we have to call the distructor on the RHS symbol first. */
    lhsdirect = 1;
    if (has_destructor(rp->rhs[0], lemp)) {
      append_str(0, 0, 0, 0);
      append_str("  yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
                 rp->rhs[0]->index, 1 - rp->nrhs);
      rp->codePrefix = Strsafe(append_str(0, 0, 0, 0));
      rp->noCode = 0;
    }
  } else if (rp->lhsalias == 0) {
    /* There is no LHS value symbol. */
    lhsdirect = 1;
  } else if (strcmp(rp->lhsalias, rp->rhsalias[0]) == 0) {
    /* The LHS symbol and the left-most RHS symbol are the same, so
    ** direct writing is allowed */
    lhsdirect = 1;
    lhsused = 1;
    used[0] = 1;
    if (rp->lhs->dtnum != rp->rhs[0]->dtnum) {
      ErrorMsg(lemp->filename, rp->ruleline,
               "%s(%s) and %s(%s) share the same label but have "
               "different datatypes.",
               rp->lhs->name, rp->lhsalias, rp->rhs[0]->name, rp->rhsalias[0]);
      lemp->errorcnt++;
    }
  } else {
    lemon_sprintf(zOvwrt, "/*%s-overwrites-%s*/", rp->lhsalias,
                  rp->rhsalias[0]);
    zSkip = strstr(rp->code, zOvwrt);
    if (zSkip != 0) {
      /* The code contains a special comment that indicates that it is safe
      ** for the LHS label to overwrite left-most RHS label. */
      lhsdirect = 1;
    } else {
      lhsdirect = 0;
    }
  }
  if (lhsdirect) {
    sprintf(zLhs, "yymsp[%d].minor.yy%d", 1 - rp->nrhs, rp->lhs->dtnum);
  } else {
    rc = 1;
    sprintf(zLhs, "yylhsminor.yy%d", rp->lhs->dtnum);
  }

  append_str(0, 0, 0, 0);

  /* This const cast is wrong but harmless, if we're careful. */
  for (cp = (char *)rp->code; *cp; cp++) {
    if (cp == zSkip) {
      append_str(zOvwrt, 0, 0, 0);
      cp += lemonStrlen(zOvwrt) - 1;
      dontUseRhs0 = 1;
      continue;
    }
    if (ISALPHA(*cp) &&
        (cp == rp->code || (!ISALNUM(cp[-1]) && cp[-1] != '_'))) {
      char saved;
      for (xp = &cp[1]; ISALNUM(*xp) || *xp == '_'; xp++)
        ;
      saved = *xp;
      *xp = 0;
      if (rp->lhsalias && strcmp(cp, rp->lhsalias) == 0) {
        append_str(zLhs, 0, 0, 0);
        cp = xp;
        lhsused = 1;
      } else {
        for (i = 0; i < rp->nrhs; i++) {
          if (rp->rhsalias[i] && strcmp(cp, rp->rhsalias[i]) == 0) {
            if (i == 0 && dontUseRhs0) {
              ErrorMsg(lemp->filename, rp->ruleline,
                       "Label %s used after '%s'.", rp->rhsalias[0], zOvwrt);
              lemp->errorcnt++;
            } else if (cp != rp->code && cp[-1] == '@') {
              /* If the argument is of the form @X then substituted
              ** the token number of X, not the value of X */
              append_str("yymsp[%d].major", -1, i - rp->nrhs + 1, 0);
            } else {
              struct symbol *sp = rp->rhs[i];
              int dtnum;
              if (sp->type == MULTITERMINAL) {
                dtnum = sp->subsym[0]->dtnum;
              } else {
                dtnum = sp->dtnum;
              }
              append_str("yymsp[%d].minor.yy%d", 0, i - rp->nrhs + 1, dtnum);
            }
            cp = xp;
            used[i] = 1;
            break;
          }
        }
      }
      *xp = saved;
    }
    append_str(cp, 1, 0, 0);
  } /* End loop */

  /* Main code generation completed */
  cp = append_str(0, 0, 0, 0);
  if (cp && cp[0]) rp->code = Strsafe(cp);
  append_str(0, 0, 0, 0);

  /* Check to make sure the LHS has been used */
  if (rp->lhsalias && !lhsused) {
    ErrorMsg(lemp->filename, rp->ruleline,
             "Label \"%s\" for \"%s(%s)\" is never used.", rp->lhsalias,
             rp->lhs->name, rp->lhsalias);
    lemp->errorcnt++;
  }

  /* Generate destructor code for RHS minor values which are not referenced.
  ** Generate error messages for unused labels and duplicate labels.
  */
  for (i = 0; i < rp->nrhs; i++) {
    if (rp->rhsalias[i]) {
      if (i > 0) {
        int j;
        if (rp->lhsalias && strcmp(rp->lhsalias, rp->rhsalias[i]) == 0) {
          ErrorMsg(
              lemp->filename, rp->ruleline,
              "%s(%s) has the same label as the LHS but is not the left-most "
              "symbol on the RHS.",
              rp->rhs[i]->name, rp->rhsalias[i]);
          lemp->errorcnt++;
        }
        for (j = 0; j < i; j++) {
          if (rp->rhsalias[j] &&
              strcmp(rp->rhsalias[j], rp->rhsalias[i]) == 0) {
            ErrorMsg(lemp->filename, rp->ruleline,
                     "Label %s used for multiple symbols on the RHS of a rule.",
                     rp->rhsalias[i]);
            lemp->errorcnt++;
            break;
          }
        }
      }
      if (!used[i]) {
        ErrorMsg(lemp->filename, rp->ruleline,
                 "Label %s for \"%s(%s)\" is never used.", rp->rhsalias[i],
                 rp->rhs[i]->name, rp->rhsalias[i]);
        lemp->errorcnt++;
      }
    } else if (i > 0 && has_destructor(rp->rhs[i], lemp)) {
      append_str("  yy_destructor(yypParser,%d,&yymsp[%d].minor);\n", 0,
                 rp->rhs[i]->index, i - rp->nrhs + 1);
    }
  }

  /* If unable to write LHS values directly into the stack, write the
  ** saved LHS value now. */
  if (lhsdirect == 0) {
    append_str("  yymsp[%d].minor.yy%d = ", 0, 1 - rp->nrhs, rp->lhs->dtnum);
    append_str(zLhs, 0, 0, 0);
    append_str(";\n", 0, 0, 0);
  }

  /* Suffix code generation complete */
  cp = append_str(0, 0, 0, 0);
  if (cp && cp[0]) {
    rp->codeSuffix = Strsafe(cp);
    rp->noCode = 0;
  }

  return rc;
}

/*
** Generate code which executes when the rule "rp" is reduced.  Write
** the code to "out".  Make sure lineno stays up-to-date.
*/
PRIVATE void emit_code(FILE *out, struct rule *rp, struct lemon *lemp,
                       int *lineno) {
  const char *cp;

  /* Setup code prior to the #line directive */
  if (rp->codePrefix && rp->codePrefix[0]) {
    fprintf(out, "{%s", rp->codePrefix);
    for (cp = rp->codePrefix; *cp; cp++) {
      if (*cp == '\n') (*lineno)++;
    }
  }

  /* Generate code to do the reduce action */
  if (rp->code) {
    if (!lemp->nolinenosflag) {
      (*lineno)++;
      tplt_linedir(out, rp->line, lemp->filename);
    }
    fprintf(out, "{%s", rp->code);
    for (cp = rp->code; *cp; cp++) {
      if (*cp == '\n') (*lineno)++;
    }
    fprintf(out, "}\n");
    (*lineno)++;
    if (!lemp->nolinenosflag) {
      (*lineno)++;
      tplt_linedir(out, *lineno, lemp->outname);
    }
  }

  /* Generate breakdown code that occurs after the #line directive */
  if (rp->codeSuffix && rp->codeSuffix[0]) {
    fprintf(out, "%s", rp->codeSuffix);
    for (cp = rp->codeSuffix; *cp; cp++) {
      if (*cp == '\n') (*lineno)++;
    }
  }

  if (rp->codePrefix) {
    fprintf(out, "}\n");
    (*lineno)++;
  }

  return;
}

/*
** Print the definition of the union used for the parser's data stack.
** This union contains fields for every possible data type for tokens
** and nonterminals.  In the process of computing and printing this
** union, also set the ".dtnum" field of every terminal and nonterminal
** symbol.
*/
void print_stack_union(
    FILE *out,          /* The output stream */
    struct lemon *lemp, /* The main info structure for this parser */
    int *plineno,       /* Pointer to the line number */
    int mhflag          /* True if generating makeheaders output */
) {
  int lineno = *plineno; /* The line number of the output */
  char **types;          /* A hash table of datatypes */
  int arraysize;         /* Size of the "types" array */
  int maxdtlength;       /* Maximum length of any ".datatype" field. */
  char *stddt;           /* Standardized name for a datatype */
  int i, j;              /* Loop counters */
  unsigned hash;         /* For hashing the name of a type */
  const char *name;      /* Name of the parser */

  /* Allocate and initialize types[] and allocate stddt[] */
  arraysize = lemp->nsymbol * 2;
  types = (char **)calloc(arraysize, sizeof(char *));
  if (types == 0) {
    fprintf(stderr, "Out of memory.\n");
    exit(1);
  }
  for (i = 0; i < arraysize; i++) types[i] = 0;
  maxdtlength = 0;
  if (lemp->vartype) {
    maxdtlength = lemonStrlen(lemp->vartype);
  }
  for (i = 0; i < lemp->nsymbol; i++) {
    int len;
    struct symbol *sp = lemp->symbols[i];
    if (sp->datatype == 0) continue;
    len = lemonStrlen(sp->datatype);
    if (len > maxdtlength) maxdtlength = len;
  }
  stddt = (char *)malloc(maxdtlength * 2 + 1);
  if (stddt == 0) {
    fprintf(stderr, "Out of memory.\n");
    exit(1);
  }

  /* Build a hash table of datatypes. The ".dtnum" field of each symbol
  ** is filled in with the hash index plus 1.  A ".dtnum" value of 0 is
  ** used for terminal symbols.  If there is no %default_type defined then
  ** 0 is also used as the .dtnum value for nonterminals which do not specify
  ** a datatype using the %type directive.
  */
  for (i = 0; i < lemp->nsymbol; i++) {
    struct symbol *sp = lemp->symbols[i];
    char *cp;
    if (sp == lemp->errsym) {
      sp->dtnum = arraysize + 1;
      continue;
    }
    if (sp->type != NONTERMINAL || (sp->datatype == 0 && lemp->vartype == 0)) {
      sp->dtnum = 0;
      continue;
    }
    cp = sp->datatype;
    if (cp == 0) cp = lemp->vartype;
    j = 0;
    while (ISSPACE(*cp)) cp++;
    while (*cp) stddt[j++] = *cp++;
    while (j > 0 && ISSPACE(stddt[j - 1])) j--;
    stddt[j] = 0;
    if (lemp->tokentype && strcmp(stddt, lemp->tokentype) == 0) {
      sp->dtnum = 0;
      continue;
    }
    hash = 0;
    for (j = 0; stddt[j]; j++) {
      hash = hash * 53 + stddt[j];
    }
    hash = (hash & 0x7fffffff) % arraysize;
    while (types[hash]) {
      if (strcmp(types[hash], stddt) == 0) {
        sp->dtnum = hash + 1;
        break;
      }
      hash++;
      if (hash >= (unsigned)arraysize) hash = 0;
    }
    if (types[hash] == 0) {
      sp->dtnum = hash + 1;
      types[hash] = (char *)malloc(lemonStrlen(stddt) + 1);
      if (types[hash] == 0) {
        fprintf(stderr, "Out of memory.\n");
        exit(1);
      }
      lemon_strcpy(types[hash], stddt);
    }
  }

  /* Print out the definition of YYTOKENTYPE and YYMINORTYPE */
  name = lemp->name ? lemp->name : "Parse";
  lineno = *plineno;
  if (mhflag) {
    fprintf(out, "#if INTERFACE\n");
    lineno++;
  }
  fprintf(out, "#define %sTOKENTYPE %s\n", name,
          lemp->tokentype ? lemp->tokentype : "void*");
  lineno++;
  if (mhflag) {
    fprintf(out, "#endif\n");
    lineno++;
  }
  fprintf(out, "typedef union {\n");
  lineno++;
  fprintf(out, "  int yyinit;\n");
  lineno++;
  fprintf(out, "  %sTOKENTYPE yy0;\n", name);
  lineno++;
  for (i = 0; i < arraysize; i++) {
    if (types[i] == 0) continue;
    fprintf(out, "  %s yy%d;\n", types[i], i + 1);
    lineno++;
    free(types[i]);
  }
  if (lemp->errsym && lemp->errsym->useCnt) {
    fprintf(out, "  int yy%d;\n", lemp->errsym->dtnum);
    lineno++;
  }
  free(stddt);
  free(types);
  fprintf(out, "} YYMINORTYPE;\n");
  lineno++;
  *plineno = lineno;
}

/*
** Return the name of a C datatype able to represent values between
** lwr and upr, inclusive.  If pnByte!=NULL then also write the sizeof
** for that type (1, 2, or 4) into *pnByte.
*/
static const char *minimum_size_type(int lwr, int upr, int *pnByte) {
  const char *zType = "int";
  int nByte = 4;
  if (lwr >= 0) {
    if (upr <= 255) {
      zType = "unsigned char";
      nByte = 1;
    } else if (upr < 65535) {
      zType = "unsigned short int";
      nByte = 2;
    } else {
      zType = "unsigned int";
      nByte = 4;
    }
  } else if (lwr >= -127 && upr <= 127) {
    zType = "signed char";
    nByte = 1;
  } else if (lwr >= -32767 && upr < 32767) {
    zType = "short";
    nByte = 2;
  }
  if (pnByte) *pnByte = nByte;
  return zType;
}

/*
** Each state contains a set of token transaction and a set of
** nonterminal transactions.  Each of these sets makes an instance
** of the following structure.  An array of these structures is used
** to order the creation of entries in the yy_action[] table.
*/
struct axset {
  struct state *stp; /* A pointer to a state */
  int isTkn;         /* True to use tokens.  False for non-terminals */
  int nAction;       /* Number of actions */
  int iOrder;        /* Original order of action sets */
};

/*
** Compare to axset structures for sorting purposes
*/
static int axset_compare(const void *a, const void *b) {
  struct axset *p1 = (struct axset *)a;
  struct axset *p2 = (struct axset *)b;
  int c;
  c = p2->nAction - p1->nAction;
  if (c == 0) {
    c = p1->iOrder - p2->iOrder;
  }
  assert(c != 0 || p1 == p2);
  return c;
}

/*
** Write text on "out" that describes the rule "rp".
*/
static void writeRuleText(FILE *out, struct rule *rp) {
  int j;
  fprintf(out, "%s ::=", rp->lhs->name);
  for (j = 0; j < rp->nrhs; j++) {
    struct symbol *sp = rp->rhs[j];
    if (sp->type != MULTITERMINAL) {
      fprintf(out, " %s", sp->name);
    } else {
      int k;
      fprintf(out, " %s", sp->subsym[0]->name);
      for (k = 1; k < sp->nsubsym; k++) {
        fprintf(out, "|%s", sp->subsym[k]->name);
      }
    }
  }
}

/* Generate C source code for the parser */
void ReportTable(struct lemon *lemp,
                 int mhflag, /* Output in makeheaders format if true */
                 int sqlFlag /* Generate the *.sql file too */
) {
  FILE *out, *in, *sql;
  char *line = gc(xmalloc(LINESIZE));
  int lineno;
  struct state *stp;
  struct action *ap;
  struct rule *rp;
  struct acttab *pActtab;
  int i, j, n, sz;
  int nLookAhead;
  int szActionType; /* sizeof(YYACTIONTYPE) */
  int szCodeType;   /* sizeof(YYCODETYPE)   */
  const char *name;
  int mnTknOfst, mxTknOfst;
  int mnNtOfst, mxNtOfst;
  struct axset *ax;
  char *prefix;

  lemp->minShiftReduce = lemp->nstate;
  lemp->errAction = lemp->minShiftReduce + lemp->nrule;
  lemp->accAction = lemp->errAction + 1;
  lemp->noAction = lemp->accAction + 1;
  lemp->minReduce = lemp->noAction + 1;
  lemp->maxAction = lemp->minReduce + lemp->nrule;

  in = tplt_open(lemp);
  if (in == 0) return;
  out = file_open(lemp, ".c.inc", "wb");
  if (out == 0) {
    fclose(in);
    return;
  }
  if (sqlFlag == 0) {
    sql = 0;
  } else {
    sql = file_open(lemp, ".sql", "wb");
    if (sql == 0) {
      fclose(in);
      fclose(out);
      return;
    }
    fprintf(sql, "BEGIN;\n"
                 "CREATE TABLE symbol(\n"
                 "  id INTEGER PRIMARY KEY,\n"
                 "  name TEXT NOT NULL,\n"
                 "  isTerminal BOOLEAN NOT NULL,\n"
                 "  fallback INTEGER REFERENCES symbol"
                 " DEFERRABLE INITIALLY DEFERRED\n"
                 ");\n");
    for (i = 0; i < lemp->nsymbol; i++) {
      fprintf(sql,
              "INSERT INTO symbol(id,name,isTerminal,fallback)"
              "VALUES(%d,'%s',%s",
              i, lemp->symbols[i]->name,
              i < lemp->nterminal ? "TRUE" : "FALSE");
      if (lemp->symbols[i]->fallback) {
        fprintf(sql, ",%d);\n", lemp->symbols[i]->fallback->index);
      } else {
        fprintf(sql, ",NULL);\n");
      }
    }
    fprintf(sql, "CREATE TABLE rule(\n"
                 "  ruleid INTEGER PRIMARY KEY,\n"
                 "  lhs INTEGER REFERENCES symbol(id),\n"
                 "  txt TEXT\n"
                 ");\n"
                 "CREATE TABLE rulerhs(\n"
                 "  ruleid INTEGER REFERENCES rule(ruleid),\n"
                 "  pos INTEGER,\n"
                 "  sym INTEGER REFERENCES symbol(id)\n"
                 ");\n");
    for (i = 0, rp = lemp->rule; rp; rp = rp->next, i++) {
      assert(i == rp->iRule);
      fprintf(sql, "INSERT INTO rule(ruleid,lhs,txt)VALUES(%d,%d,'", rp->iRule,
              rp->lhs->index);
      writeRuleText(sql, rp);
      fprintf(sql, "');\n");
      for (j = 0; j < rp->nrhs; j++) {
        struct symbol *sp = rp->rhs[j];
        if (sp->type != MULTITERMINAL) {
          fprintf(sql, "INSERT INTO rulerhs(ruleid,pos,sym)VALUES(%d,%d,%d);\n",
                  i, j, sp->index);
        } else {
          int k;
          for (k = 0; k < sp->nsubsym; k++) {
            fprintf(sql,
                    "INSERT INTO rulerhs(ruleid,pos,sym)VALUES(%d,%d,%d);\n", i,
                    j, sp->subsym[k]->index);
          }
        }
      }
    }
    fprintf(sql, "COMMIT;\n");
  }
  lineno = 1;

  fprintf(
      out,
      "/* This file is automatically generated by Lemon from input grammar\n"
      "** source file \"%s\". */\n",
      lemp->filename);
  lineno += 2;

  /* The first %include directive begins with a C-language comment,
  ** then skip over the header comment of the template file
  */
  if (lemp->include == 0) lemp->include = "";
  for (i = 0; ISSPACE(lemp->include[i]); i++) {
    if (lemp->include[i] == '\n') {
      lemp->include += i + 1;
      i = -1;
    }
  }
  if (lemp->include[0] == '/') {
    tplt_skip_header(in, &lineno);
  } else {
    tplt_xfer(lemp->name, in, out, &lineno);
  }

  /* Generate the include code, if any */
  tplt_print(out, lemp, lemp->include, &lineno);
  if (mhflag) {
    char *incName = file_makename(lemp, ".h.inc");
    fprintf(out, "#include \"%s\"\n", incName);
    lineno++;
    free(incName);
  }
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate #defines for all tokens */
  if (lemp->tokenprefix)
    prefix = lemp->tokenprefix;
  else
    prefix = "";
  if (mhflag) {
    fprintf(out, "#if INTERFACE\n");
    lineno++;
  } else {
    fprintf(out, "#ifndef %s%s\n", prefix, lemp->symbols[1]->name);
  }
  for (i = 1; i < lemp->nterminal; i++) {
    fprintf(out, "#define %s%-30s %2d\n", prefix, lemp->symbols[i]->name, i);
    lineno++;
  }
  fprintf(out, "#endif\n");
  lineno++;
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate the defines */
  fprintf(out, "#define YYCODETYPE %s\n",
          minimum_size_type(0, lemp->nsymbol, &szCodeType));
  lineno++;
  fprintf(out, "#define YYNOCODE %d\n", lemp->nsymbol);
  lineno++;
  fprintf(out, "#define YYACTIONTYPE %s\n",
          minimum_size_type(0, lemp->maxAction, &szActionType));
  lineno++;
  if (lemp->wildcard) {
    fprintf(out, "#define YYWILDCARD %d\n", lemp->wildcard->index);
    lineno++;
  }
  print_stack_union(out, lemp, &lineno, mhflag);
  fprintf(out, "#ifndef YYSTACKDEPTH\n");
  lineno++;
  if (lemp->stacksize) {
    fprintf(out, "#define YYSTACKDEPTH %s\n", lemp->stacksize);
    lineno++;
  } else {
    fprintf(out, "#define YYSTACKDEPTH 100\n");
    lineno++;
  }
  fprintf(out, "#endif\n");
  lineno++;
  if (mhflag) {
    fprintf(out, "#if INTERFACE\n");
    lineno++;
  }
  name = lemp->name ? lemp->name : "Parse";
  if (lemp->arg && lemp->arg[0]) {
    i = lemonStrlen(lemp->arg);
    while (i >= 1 && ISSPACE(lemp->arg[i - 1])) i--;
    while (i >= 1 && (ISALNUM(lemp->arg[i - 1]) || lemp->arg[i - 1] == '_'))
      i--;
    fprintf(out, "#define %sARG_SDECL %s;\n", name, lemp->arg);
    lineno++;
    fprintf(out, "#define %sARG_PDECL ,%s\n", name, lemp->arg);
    lineno++;
    fprintf(out, "#define %sARG_PARAM ,%s\n", name, &lemp->arg[i]);
    lineno++;
    fprintf(out, "#define %sARG_FETCH %s=yypParser->%s;\n", name, lemp->arg,
            &lemp->arg[i]);
    lineno++;
    fprintf(out, "#define %sARG_STORE yypParser->%s=%s;\n", name, &lemp->arg[i],
            &lemp->arg[i]);
    lineno++;
  } else {
    fprintf(out, "#define %sARG_SDECL\n", name);
    lineno++;
    fprintf(out, "#define %sARG_PDECL\n", name);
    lineno++;
    fprintf(out, "#define %sARG_PARAM\n", name);
    lineno++;
    fprintf(out, "#define %sARG_FETCH\n", name);
    lineno++;
    fprintf(out, "#define %sARG_STORE\n", name);
    lineno++;
  }
  if (lemp->ctx && lemp->ctx[0]) {
    i = lemonStrlen(lemp->ctx);
    while (i >= 1 && ISSPACE(lemp->ctx[i - 1])) i--;
    while (i >= 1 && (ISALNUM(lemp->ctx[i - 1]) || lemp->ctx[i - 1] == '_'))
      i--;
    fprintf(out, "#define %sCTX_SDECL %s;\n", name, lemp->ctx);
    lineno++;
    fprintf(out, "#define %sCTX_PDECL ,%s\n", name, lemp->ctx);
    lineno++;
    fprintf(out, "#define %sCTX_PARAM ,%s\n", name, &lemp->ctx[i]);
    lineno++;
    fprintf(out, "#define %sCTX_FETCH %s=yypParser->%s;\n", name, lemp->ctx,
            &lemp->ctx[i]);
    lineno++;
    fprintf(out, "#define %sCTX_STORE yypParser->%s=%s;\n", name, &lemp->ctx[i],
            &lemp->ctx[i]);
    lineno++;
  } else {
    fprintf(out, "#define %sCTX_SDECL\n", name);
    lineno++;
    fprintf(out, "#define %sCTX_PDECL\n", name);
    lineno++;
    fprintf(out, "#define %sCTX_PARAM\n", name);
    lineno++;
    fprintf(out, "#define %sCTX_FETCH\n", name);
    lineno++;
    fprintf(out, "#define %sCTX_STORE\n", name);
    lineno++;
  }
  if (mhflag) {
    fprintf(out, "#endif\n");
    lineno++;
  }
  if (lemp->errsym && lemp->errsym->useCnt) {
    fprintf(out, "#define YYERRORSYMBOL %d\n", lemp->errsym->index);
    lineno++;
    fprintf(out, "#define YYERRSYMDT yy%d\n", lemp->errsym->dtnum);
    lineno++;
  }
  if (lemp->has_fallback) {
    fprintf(out, "#define YYFALLBACK 1\n");
    lineno++;
  }

  /* Compute the action table, but do not output it yet.  The action
  ** table must be computed before generating the YYNSTATE macro because
  ** we need to know how many states can be eliminated.
  */
  ax = (struct axset *)calloc(lemp->nxstate * 2, sizeof(ax[0]));
  if (ax == 0) {
    fprintf(stderr, "malloc failed\n");
    exit(1);
  }
  for (i = 0; i < lemp->nxstate; i++) {
    stp = lemp->sorted[i];
    ax[i * 2].stp = stp;
    ax[i * 2].isTkn = 1;
    ax[i * 2].nAction = stp->nTknAct;
    ax[i * 2 + 1].stp = stp;
    ax[i * 2 + 1].isTkn = 0;
    ax[i * 2 + 1].nAction = stp->nNtAct;
  }
  mxTknOfst = mnTknOfst = 0;
  mxNtOfst = mnNtOfst = 0;
  /* In an effort to minimize the action table size, use the heuristic
  ** of placing the largest action sets first */
  for (i = 0; i < lemp->nxstate * 2; i++) ax[i].iOrder = i;
  qsort(ax, lemp->nxstate * 2, sizeof(ax[0]), axset_compare);
  pActtab = acttab_alloc(lemp->nsymbol, lemp->nterminal);
  for (i = 0; i < lemp->nxstate * 2 && ax[i].nAction > 0; i++) {
    stp = ax[i].stp;
    if (ax[i].isTkn) {
      for (ap = stp->ap; ap; ap = ap->next) {
        int action;
        if (ap->sp->index >= lemp->nterminal) continue;
        action = compute_action(lemp, ap);
        if (action < 0) continue;
        acttab_action(pActtab, ap->sp->index, action);
      }
      stp->iTknOfst = acttab_insert(pActtab, 1);
      if (stp->iTknOfst < mnTknOfst) mnTknOfst = stp->iTknOfst;
      if (stp->iTknOfst > mxTknOfst) mxTknOfst = stp->iTknOfst;
    } else {
      for (ap = stp->ap; ap; ap = ap->next) {
        int action;
        if (ap->sp->index < lemp->nterminal) continue;
        if (ap->sp->index == lemp->nsymbol) continue;
        action = compute_action(lemp, ap);
        if (action < 0) continue;
        acttab_action(pActtab, ap->sp->index, action);
      }
      stp->iNtOfst = acttab_insert(pActtab, 0);
      if (stp->iNtOfst < mnNtOfst) mnNtOfst = stp->iNtOfst;
      if (stp->iNtOfst > mxNtOfst) mxNtOfst = stp->iNtOfst;
    }
#if 0 /* Uncomment for a trace of how the yy_action[] table fills out */
    { int jj, nn;
      for(jj=nn=0; jj<pActtab->nAction; jj++){
        if( pActtab->aAction[jj].action<0 ) nn++;
      }
      printf("%4d: State %3d %s n: %2d size: %5d freespace: %d\n",
             i, stp->statenum, ax[i].isTkn ? "Token" : "Var  ",
             ax[i].nAction, pActtab->nAction, nn);
    }
#endif
  }
  free(ax);

  /* Mark rules that are actually used for reduce actions after all
  ** optimizations have been applied
  */
  for (rp = lemp->rule; rp; rp = rp->next) rp->doesReduce = LEMON_FALSE;
  for (i = 0; i < lemp->nxstate; i++) {
    for (ap = lemp->sorted[i]->ap; ap; ap = ap->next) {
      if (ap->type == REDUCE || ap->type == SHIFTREDUCE) {
        ap->x.rp->doesReduce = 1;
      }
    }
  }

  /* Finish rendering the constants now that the action table has
  ** been computed */
  fprintf(out, "#define YYNSTATE             %d\n", lemp->nxstate);
  lineno++;
  fprintf(out, "#define YYNRULE              %d\n", lemp->nrule);
  lineno++;
  fprintf(out, "#define YYNRULE_WITH_ACTION  %d\n", lemp->nruleWithAction);
  lineno++;
  fprintf(out, "#define YYNTOKEN             %d\n", lemp->nterminal);
  lineno++;
  fprintf(out, "#define YY_MAX_SHIFT         %d\n", lemp->nxstate - 1);
  lineno++;
  i = lemp->minShiftReduce;
  fprintf(out, "#define YY_MIN_SHIFTREDUCE   %d\n", i);
  lineno++;
  i += lemp->nrule;
  fprintf(out, "#define YY_MAX_SHIFTREDUCE   %d\n", i - 1);
  lineno++;
  fprintf(out, "#define YY_ERROR_ACTION      %d\n", lemp->errAction);
  lineno++;
  fprintf(out, "#define YY_ACCEPT_ACTION     %d\n", lemp->accAction);
  lineno++;
  fprintf(out, "#define YY_NO_ACTION         %d\n", lemp->noAction);
  lineno++;
  fprintf(out, "#define YY_MIN_REDUCE        %d\n", lemp->minReduce);
  lineno++;
  i = lemp->minReduce + lemp->nrule;
  fprintf(out, "#define YY_MAX_REDUCE        %d\n", i - 1);
  lineno++;
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Now output the action table and its associates:
  **
  **  yy_action[]        A single table containing all actions.
  **  yy_lookahead[]     A table containing the lookahead for each entry in
  **                     yy_action.  Used to detect hash collisions.
  **  yy_shift_ofst[]    For each state, the offset into yy_action for
  **                     shifting terminals.
  **  yy_reduce_ofst[]   For each state, the offset into yy_action for
  **                     shifting non-terminals after a reduce.
  **  yy_default[]       Default action for each state.
  */

  /* Output the yy_action table */
  lemp->nactiontab = n = acttab_action_size(pActtab);
  lemp->tablesize += n * szActionType;
  fprintf(out, "#define YY_ACTTAB_COUNT (%d)\n", n);
  lineno++;
  fprintf(out, "static const YYACTIONTYPE yy_action[] = {\n");
  lineno++;
  for (i = j = 0; i < n; i++) {
    int action = acttab_yyaction(pActtab, i);
    if (action < 0) action = lemp->noAction;
    if (j == 0) fprintf(out, " /* %5d */ ", i);
    fprintf(out, " %4d,", action);
    if (j == 9 || i == n - 1) {
      fprintf(out, "\n");
      lineno++;
      j = 0;
    } else {
      j++;
    }
  }
  fprintf(out, "};\n");
  lineno++;

  /* Output the yy_lookahead table */
  lemp->nlookaheadtab = n = acttab_lookahead_size(pActtab);
  lemp->tablesize += n * szCodeType;
  fprintf(out, "static const YYCODETYPE yy_lookahead[] = {\n");
  lineno++;
  for (i = j = 0; i < n; i++) {
    int la = acttab_yylookahead(pActtab, i);
    if (la < 0) la = lemp->nsymbol;
    if (j == 0) fprintf(out, " /* %5d */ ", i);
    fprintf(out, " %4d,", la);
    if (j == 9) {
      fprintf(out, "\n");
      lineno++;
      j = 0;
    } else {
      j++;
    }
  }
  /* Add extra entries to the end of the yy_lookahead[] table so that
  ** yy_shift_ofst[]+iToken will always be a valid index into the array,
  ** even for the largest possible value of yy_shift_ofst[] and iToken. */
  nLookAhead = lemp->nterminal + lemp->nactiontab;
  while (i < nLookAhead) {
    if (j == 0) fprintf(out, " /* %5d */ ", i);
    fprintf(out, " %4d,", lemp->nterminal);
    if (j == 9) {
      fprintf(out, "\n");
      lineno++;
      j = 0;
    } else {
      j++;
    }
    i++;
  }
  if (j > 0) {
    fprintf(out, "\n");
    lineno++;
  }
  fprintf(out, "};\n");
  lineno++;

  /* Output the yy_shift_ofst[] table */
  n = lemp->nxstate;
  while (n > 0 && lemp->sorted[n - 1]->iTknOfst == NO_OFFSET) n--;
  fprintf(out, "#define YY_SHIFT_COUNT    (%d)\n", n - 1);
  lineno++;
  fprintf(out, "#define YY_SHIFT_MIN      (%d)\n", mnTknOfst);
  lineno++;
  fprintf(out, "#define YY_SHIFT_MAX      (%d)\n", mxTknOfst);
  lineno++;
  fprintf(
      out, "static const %s yy_shift_ofst[] = {\n",
      minimum_size_type(mnTknOfst, lemp->nterminal + lemp->nactiontab, &sz));
  lineno++;
  lemp->tablesize += n * sz;
  for (i = j = 0; i < n; i++) {
    int ofst;
    stp = lemp->sorted[i];
    ofst = stp->iTknOfst;
    if (ofst == NO_OFFSET) ofst = lemp->nactiontab;
    if (j == 0) fprintf(out, " /* %5d */ ", i);
    fprintf(out, " %4d,", ofst);
    if (j == 9 || i == n - 1) {
      fprintf(out, "\n");
      lineno++;
      j = 0;
    } else {
      j++;
    }
  }
  fprintf(out, "};\n");
  lineno++;

  /* Output the yy_reduce_ofst[] table */
  n = lemp->nxstate;
  while (n > 0 && lemp->sorted[n - 1]->iNtOfst == NO_OFFSET) n--;
  fprintf(out, "#define YY_REDUCE_COUNT (%d)\n", n - 1);
  lineno++;
  fprintf(out, "#define YY_REDUCE_MIN   (%d)\n", mnNtOfst);
  lineno++;
  fprintf(out, "#define YY_REDUCE_MAX   (%d)\n", mxNtOfst);
  lineno++;
  fprintf(out, "static const %s yy_reduce_ofst[] = {\n",
          minimum_size_type(mnNtOfst - 1, mxNtOfst, &sz));
  lineno++;
  lemp->tablesize += n * sz;
  for (i = j = 0; i < n; i++) {
    int ofst;
    stp = lemp->sorted[i];
    ofst = stp->iNtOfst;
    if (ofst == NO_OFFSET) ofst = mnNtOfst - 1;
    if (j == 0) fprintf(out, " /* %5d */ ", i);
    fprintf(out, " %4d,", ofst);
    if (j == 9 || i == n - 1) {
      fprintf(out, "\n");
      lineno++;
      j = 0;
    } else {
      j++;
    }
  }
  fprintf(out, "};\n");
  lineno++;

  /* Output the default action table */
  fprintf(out, "static const YYACTIONTYPE yy_default[] = {\n");
  lineno++;
  n = lemp->nxstate;
  lemp->tablesize += n * szActionType;
  for (i = j = 0; i < n; i++) {
    stp = lemp->sorted[i];
    if (j == 0) fprintf(out, " /* %5d */ ", i);
    if (stp->iDfltReduce < 0) {
      fprintf(out, " %4d,", lemp->errAction);
    } else {
      fprintf(out, " %4d,", stp->iDfltReduce + lemp->minReduce);
    }
    if (j == 9 || i == n - 1) {
      fprintf(out, "\n");
      lineno++;
      j = 0;
    } else {
      j++;
    }
  }
  fprintf(out, "};\n");
  lineno++;
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate the table of fallback tokens.
   */
  if (lemp->has_fallback) {
    int mx = lemp->nterminal - 1;
    /* 2019-08-28:  Generate fallback entries for every token to avoid
    ** having to do a range check on the index */
    /* while( mx>0 && lemp->symbols[mx]->fallback==0 ){ mx--; } */
    lemp->tablesize += (mx + 1) * szCodeType;
    for (i = 0; i <= mx; i++) {
      struct symbol *p = lemp->symbols[i];
      if (p->fallback == 0) {
        fprintf(out, "    0,  /* %10s => nothing */\n", p->name);
      } else {
        fprintf(out, "  %3d,  /* %10s => %s */\n", p->fallback->index, p->name,
                p->fallback->name);
      }
      lineno++;
    }
  }
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate a table containing the symbolic name of every symbol
   */
  for (i = 0; i < lemp->nsymbol; i++) {
    lemon_sprintf(line, "\"%s\",", lemp->symbols[i]->name);
    fprintf(out, "  /* %4d */ \"%s\",\n", i, lemp->symbols[i]->name);
    lineno++;
  }
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate a table containing a text string that describes every
  ** rule in the rule set of the grammar.  This information is used
  ** when tracing REDUCE actions.
  */
  for (i = 0, rp = lemp->rule; rp; rp = rp->next, i++) {
    assert(rp->iRule == i);
    fprintf(out, " /* %3d */ \"", i);
    writeRuleText(out, rp);
    fprintf(out, "\",\n");
    lineno++;
  }
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate code which executes every time a symbol is popped from
  ** the stack while processing errors or while destroying the parser.
  ** (In other words, generate the %destructor actions)
  */
  if (lemp->tokendest) {
    int once = 1;
    for (i = 0; i < lemp->nsymbol; i++) {
      struct symbol *sp = lemp->symbols[i];
      if (sp == 0 || sp->type != TERMINAL) continue;
      if (once) {
        fprintf(out, "      /* TERMINAL Destructor */\n");
        lineno++;
        once = 0;
      }
      fprintf(out, "    case %d: /* %s */\n", sp->index, sp->name);
      lineno++;
    }
    for (i = 0; i < lemp->nsymbol && lemp->symbols[i]->type != TERMINAL; i++)
      ;
    if (i < lemp->nsymbol) {
      emit_destructor_code(out, lemp->symbols[i], lemp, &lineno);
      fprintf(out, "      break;\n");
      lineno++;
    }
  }
  if (lemp->vardest) {
    struct symbol *dflt_sp = 0;
    int once = 1;
    for (i = 0; i < lemp->nsymbol; i++) {
      struct symbol *sp = lemp->symbols[i];
      if (sp == 0 || sp->type == TERMINAL || sp->index <= 0 ||
          sp->destructor != 0)
        continue;
      if (once) {
        fprintf(out, "      /* Default NON-TERMINAL Destructor */\n");
        lineno++;
        once = 0;
      }
      fprintf(out, "    case %d: /* %s */\n", sp->index, sp->name);
      lineno++;
      dflt_sp = sp;
    }
    if (dflt_sp != 0) {
      emit_destructor_code(out, dflt_sp, lemp, &lineno);
    }
    fprintf(out, "      break;\n");
    lineno++;
  }
  for (i = 0; i < lemp->nsymbol; i++) {
    struct symbol *sp = lemp->symbols[i];
    if (sp == 0 || sp->type == TERMINAL || sp->destructor == 0) continue;
    if (sp->destLineno < 0) continue; /* Already emitted */
    fprintf(out, "    case %d: /* %s */\n", sp->index, sp->name);
    lineno++;

    /* Combine duplicate destructors into a single case */
    for (j = i + 1; j < lemp->nsymbol; j++) {
      struct symbol *sp2 = lemp->symbols[j];
      if (sp2 && sp2->type != TERMINAL && sp2->destructor &&
          sp2->dtnum == sp->dtnum &&
          strcmp(sp->destructor, sp2->destructor) == 0) {
        fprintf(out, "    case %d: /* %s */\n", sp2->index, sp2->name);
        lineno++;
        sp2->destLineno = -1; /* Avoid emitting this destructor again */
      }
    }

    emit_destructor_code(out, lemp->symbols[i], lemp, &lineno);
    fprintf(out, "      break;\n");
    lineno++;
  }
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate code which executes whenever the parser stack overflows */
  tplt_print(out, lemp, lemp->overflow, &lineno);
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate the tables of rule information.  yyRuleInfoLhs[] and
  ** yyRuleInfoNRhs[].
  **
  ** Note: This code depends on the fact that rules are number
  ** sequentually beginning with 0.
  */
  for (i = 0, rp = lemp->rule; rp; rp = rp->next, i++) {
    fprintf(out, "  %4d,  /* (%d) ", rp->lhs->index, i);
    rule_print(out, rp);
    fprintf(out, " */\n");
    lineno++;
  }
  tplt_xfer(lemp->name, in, out, &lineno);
  for (i = 0, rp = lemp->rule; rp; rp = rp->next, i++) {
    fprintf(out, "  %3d,  /* (%d) ", -rp->nrhs, i);
    rule_print(out, rp);
    fprintf(out, " */\n");
    lineno++;
  }
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate code which execution during each REDUCE action */
  i = 0;
  for (rp = lemp->rule; rp; rp = rp->next) {
    i += translate_code(lemp, rp);
  }
  if (i) {
    fprintf(out, "        YYMINORTYPE yylhsminor;\n");
    lineno++;
  }
  /* First output rules other than the default: rule */
  for (rp = lemp->rule; rp; rp = rp->next) {
    struct rule *rp2; /* Other rules with the same action */
    if (rp->codeEmitted) continue;
    if (rp->noCode) {
      /* No C code actions, so this will be part of the "default:" rule */
      continue;
    }
    fprintf(out, "      case %d: /* ", rp->iRule);
    writeRuleText(out, rp);
    fprintf(out, " */\n");
    lineno++;
    for (rp2 = rp->next; rp2; rp2 = rp2->next) {
      if (rp2->code == rp->code && rp2->codePrefix == rp->codePrefix &&
          rp2->codeSuffix == rp->codeSuffix) {
        fprintf(out, "      case %d: /* ", rp2->iRule);
        writeRuleText(out, rp2);
        fprintf(out, " */ yytestcase(yyruleno==%d);\n", rp2->iRule);
        lineno++;
        rp2->codeEmitted = 1;
      }
    }
    emit_code(out, rp, lemp, &lineno);
    fprintf(out, "        break;\n");
    lineno++;
    rp->codeEmitted = 1;
  }
  /* Finally, output the default: rule.  We choose as the default: all
  ** empty actions. */
  fprintf(out, "      default:\n");
  lineno++;
  for (rp = lemp->rule; rp; rp = rp->next) {
    if (rp->codeEmitted) continue;
    assert(rp->noCode);
    fprintf(out, "      /* (%d) ", rp->iRule);
    writeRuleText(out, rp);
    if (rp->neverReduce) {
      fprintf(out, " (NEVER REDUCES) */ assert(yyruleno!=%d);\n", rp->iRule);
      lineno++;
    } else if (rp->doesReduce) {
      fprintf(out, " */ yytestcase(yyruleno==%d);\n", rp->iRule);
      lineno++;
    } else {
      fprintf(out, " (OPTIMIZED OUT) */ assert(yyruleno!=%d);\n", rp->iRule);
      lineno++;
    }
  }
  fprintf(out, "        break;\n");
  lineno++;
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate code which executes if a parse fails */
  tplt_print(out, lemp, lemp->failure, &lineno);
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate code which executes when a syntax error occurs */
  tplt_print(out, lemp, lemp->error, &lineno);
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Generate code which executes when the parser accepts its input */
  tplt_print(out, lemp, lemp->accept, &lineno);
  tplt_xfer(lemp->name, in, out, &lineno);

  /* Append any addition code the user desires */
  tplt_print(out, lemp, lemp->extracode, &lineno);

  acttab_free(pActtab);
  fclose(in);
  fclose(out);
  if (sql) fclose(sql);
  return;
}

/* Generate a header file for the parser */
void ReportHeader(struct lemon *lemp) {
  FILE *out, *in;
  const char *prefix;
  char *line = gc(xmalloc(LINESIZE));
  char *pattern = gc(xmalloc(LINESIZE));
  int i;

  if (lemp->tokenprefix)
    prefix = lemp->tokenprefix;
  else
    prefix = "";
  in = file_open(lemp, ".h.inc", "rb");
  if (in) {
    int nextChar;
    for (i = 1; i < lemp->nterminal && fgets(line, LINESIZE, in); i++) {
      lemon_sprintf(pattern, "#define %s%-30s %3d\n", prefix,
                    lemp->symbols[i]->name, i);
      if (strcmp(line, pattern)) break;
    }
    nextChar = fgetc(in);
    fclose(in);
    if (i == lemp->nterminal && nextChar == EOF) {
      /* No change in the file.  Don't rewrite it. */
      return;
    }
  }
  out = file_open(lemp, ".h.inc", "wb");
  if (out) {
    for (i = 1; i < lemp->nterminal; i++) {
      fprintf(out, "#define %s%-30s %3d\n", prefix, lemp->symbols[i]->name, i);
    }
    fclose(out);
  }
  return;
}

/* Reduce the size of the action tables, if possible, by making use
** of defaults.
**
** In this version, we take the most frequent REDUCE action and make
** it the default.  Except, there is no default if the wildcard token
** is a possible look-ahead.
*/
void CompressTables(struct lemon *lemp) {
  struct state *stp;
  struct action *ap, *ap2, *nextap;
  struct rule *rp, *rp2, *rbest;
  int nbest, n;
  int i;
  int usesWildcard;

  for (i = 0; i < lemp->nstate; i++) {
    stp = lemp->sorted[i];
    nbest = 0;
    rbest = 0;
    usesWildcard = 0;

    for (ap = stp->ap; ap; ap = ap->next) {
      if (ap->type == SHIFT && ap->sp == lemp->wildcard) {
        usesWildcard = 1;
      }
      if (ap->type != REDUCE) continue;
      rp = ap->x.rp;
      if (rp->lhsStart) continue;
      if (rp == rbest) continue;
      n = 1;
      for (ap2 = ap->next; ap2; ap2 = ap2->next) {
        if (ap2->type != REDUCE) continue;
        rp2 = ap2->x.rp;
        if (rp2 == rbest) continue;
        if (rp2 == rp) n++;
      }
      if (n > nbest) {
        nbest = n;
        rbest = rp;
      }
    }

    /* Do not make a default if the number of rules to default
    ** is not at least 1 or if the wildcard token is a possible
    ** lookahead.
    */
    if (nbest < 1 || usesWildcard) continue;

    /* Combine matching REDUCE actions into a single default */
    for (ap = stp->ap; ap; ap = ap->next) {
      if (ap->type == REDUCE && ap->x.rp == rbest) break;
    }
    assert(ap);
    ap->sp = Symbol_new("{default}");
    for (ap = ap->next; ap; ap = ap->next) {
      if (ap->type == REDUCE && ap->x.rp == rbest) ap->type = NOT_USED;
    }
    stp->ap = Action_sort(stp->ap);

    for (ap = stp->ap; ap; ap = ap->next) {
      if (ap->type == SHIFT) break;
      if (ap->type == REDUCE && ap->x.rp != rbest) break;
    }
    if (ap == 0) {
      stp->autoReduce = 1;
      stp->pDfltReduce = rbest;
    }
  }

  /* Make a second pass over all states and actions.  Convert
  ** every action that is a SHIFT to an autoReduce state into
  ** a SHIFTREDUCE action.
  */
  for (i = 0; i < lemp->nstate; i++) {
    stp = lemp->sorted[i];
    for (ap = stp->ap; ap; ap = ap->next) {
      struct state *pNextState;
      if (ap->type != SHIFT) continue;
      pNextState = ap->x.stp;
      if (pNextState->autoReduce && pNextState->pDfltReduce != 0) {
        ap->type = SHIFTREDUCE;
        ap->x.rp = pNextState->pDfltReduce;
      }
    }
  }

  /* If a SHIFTREDUCE action specifies a rule that has a single RHS term
  ** (meaning that the SHIFTREDUCE will land back in the state where it
  ** started) and if there is no C-code associated with the reduce action,
  ** then we can go ahead and convert the action to be the same as the
  ** action for the RHS of the rule.
  */
  for (i = 0; i < lemp->nstate; i++) {
    stp = lemp->sorted[i];
    for (ap = stp->ap; ap; ap = nextap) {
      nextap = ap->next;
      if (ap->type != SHIFTREDUCE) continue;
      rp = ap->x.rp;
      if (rp->noCode == 0) continue;
      if (rp->nrhs != 1) continue;
#if 1
      /* Only apply this optimization to non-terminals.  It would be OK to
      ** apply it to terminal symbols too, but that makes the parser tables
      ** larger. */
      if (ap->sp->index < lemp->nterminal) continue;
#endif
      /* If we reach this point, it means the optimization can be applied */
      nextap = ap;
      for (ap2 = stp->ap; ap2 && (ap2 == ap || ap2->sp != rp->lhs);
           ap2 = ap2->next) {
      }
      assert(ap2 != 0);
      ap->spOpt = ap2->sp;
      ap->type = ap2->type;
      ap->x = ap2->x;
    }
  }
}

/*
** Compare two states for sorting purposes.  The smaller state is the
** one with the most non-terminal actions.  If they have the same number
** of non-terminal actions, then the smaller is the one with the most
** token actions.
*/
static int stateResortCompare(const void *a, const void *b) {
  const struct state *pA = *(const struct state **)a;
  const struct state *pB = *(const struct state **)b;
  int n;

  n = pB->nNtAct - pA->nNtAct;
  if (n == 0) {
    n = pB->nTknAct - pA->nTknAct;
    if (n == 0) {
      n = pB->statenum - pA->statenum;
    }
  }
  assert(n != 0);
  return n;
}

/*
** Renumber and resort states so that states with fewer choices
** occur at the end.  Except, keep state 0 as the first state.
*/
void ResortStates(struct lemon *lemp) {
  int i;
  struct state *stp;
  struct action *ap;

  for (i = 0; i < lemp->nstate; i++) {
    stp = lemp->sorted[i];
    stp->nTknAct = stp->nNtAct = 0;
    stp->iDfltReduce = -1; /* Init dflt action to "syntax error" */
    stp->iTknOfst = NO_OFFSET;
    stp->iNtOfst = NO_OFFSET;
    for (ap = stp->ap; ap; ap = ap->next) {
      int iAction = compute_action(lemp, ap);
      if (iAction >= 0) {
        if (ap->sp->index < lemp->nterminal) {
          stp->nTknAct++;
        } else if (ap->sp->index < lemp->nsymbol) {
          stp->nNtAct++;
        } else {
          assert(stp->autoReduce == 0 || stp->pDfltReduce == ap->x.rp);
          stp->iDfltReduce = iAction;
        }
      }
    }
  }
  qsort(&lemp->sorted[1], lemp->nstate - 1, sizeof(lemp->sorted[0]),
        stateResortCompare);
  for (i = 0; i < lemp->nstate; i++) {
    lemp->sorted[i]->statenum = i;
  }
  lemp->nxstate = lemp->nstate;
  while (lemp->nxstate > 1 && lemp->sorted[lemp->nxstate - 1]->autoReduce) {
    lemp->nxstate--;
  }
}

/***************** From the file "set.c" ************************************/
/*
** Set manipulation routines for the LEMON parser generator.
*/

static int size = 0;

/* Set the set size */
void SetSize(int n) {
  size = n + 1;
}

/* Allocate a new set */
char *SetNew(void) {
  char *s;
  s = (char *)calloc(size, 1);
  if (s == 0) {
    memory_error();
  }
  return s;
}

/* Deallocate a set */
void SetFree(char *s) {
  free(s);
}

/* Add a new element to the set.  Return TRUE if the element was added
** and FALSE if it was already there. */
int SetAdd(char *s, int e) {
  int rv;
  assert(e >= 0 && e < size);
  rv = s[e];
  s[e] = 1;
  return !rv;
}

/* Add every element of s2 to s1.  Return TRUE if s1 changes. */
int SetUnion(char *s1, char *s2) {
  int i, progress;
  progress = 0;
  for (i = 0; i < size; i++) {
    if (s2[i] == 0) continue;
    if (s1[i] == 0) {
      progress = 1;
      s1[i] = 1;
    }
  }
  return progress;
}

/********************** From the file "table.c" ****************************/
/*
** All code in this file has been automatically generated
** from a specification in the file
**              "table.q"
** by the associative array code building program "aagen".
** Do not edit this file!  Instead, edit the specification
** file, then rerun aagen.
*/
/*
** Code for processing tables in the LEMON parser generator.
*/

PRIVATE unsigned strhash(const char *x) {
  unsigned h = 0;
  while (*x) h = h * 13 + *(x++);
  return h;
}

/* Works like strdup, sort of.  Save a string in malloced memory, but
** keep strings in a table so that the same string is not in more
** than one place.
*/
const char *Strsafe(const char *y) {
  const char *z;
  char *cpy;

  if (y == 0) return 0;
  z = Strsafe_find(y);
  if (z == 0 && (cpy = (char *)malloc(lemonStrlen(y) + 1)) != 0) {
    lemon_strcpy(cpy, y);
    z = cpy;
    Strsafe_insert(z);
  }
  MemoryCheck(z);
  return z;
}

/* There is one instance of the following structure for each
** associative array of type "x1".
*/
struct s_x1 {
  int size;             /* The number of available slots. */
                        /*   Must be a power of 2 greater than or */
                        /*   equal to 1 */
  int count;            /* Number of currently slots filled */
  struct s_x1node *tbl; /* The data stored here */
  struct s_x1node **ht; /* Hash table for lookups */
};

/* There is one instance of this structure for every data element
** in an associative array of type "x1".
*/
typedef struct s_x1node {
  const char *data;       /* The data */
  struct s_x1node *next;  /* Next entry with the same hash */
  struct s_x1node **from; /* Previous link */
} x1node;

/* There is only one instance of the array, which is the following */
static struct s_x1 *x1a;

/* Allocate a new associative array */
void Strsafe_init(void) {
  if (x1a) return;
  x1a = (struct s_x1 *)malloc(sizeof(struct s_x1));
  if (x1a) {
    x1a->size = 1024;
    x1a->count = 0;
    x1a->tbl = (x1node *)calloc(1024, sizeof(x1node) + sizeof(x1node *));
    if (x1a->tbl == 0) {
      free(x1a);
      x1a = 0;
    } else {
      int i;
      x1a->ht = (x1node **)&(x1a->tbl[1024]);
      for (i = 0; i < 1024; i++) x1a->ht[i] = 0;
    }
  }
}
/* Insert a new record into the array.  Return TRUE if successful.
** Prior data with the same key is NOT overwritten */
int Strsafe_insert(const char *data) {
  x1node *np;
  unsigned h;
  unsigned ph;

  if (x1a == 0) return 0;
  ph = strhash(data);
  h = ph & (x1a->size - 1);
  np = x1a->ht[h];
  while (np) {
    if (strcmp(np->data, data) == 0) {
      /* An existing entry with the same key is found. */
      /* Fail because overwrite is not allows. */
      return 0;
    }
    np = np->next;
  }
  if (x1a->count >= x1a->size) {
    /* Need to make the hash table bigger */
    int i, arrSize;
    struct s_x1 array;
    array.size = arrSize = x1a->size * 2;
    array.count = x1a->count;
    array.tbl = (x1node *)calloc(arrSize, sizeof(x1node) + sizeof(x1node *));
    if (array.tbl == 0) return 0; /* Fail due to malloc failure */
    array.ht = (x1node **)&(array.tbl[arrSize]);
    for (i = 0; i < arrSize; i++) array.ht[i] = 0;
    for (i = 0; i < x1a->count; i++) {
      x1node *oldnp, *newnp;
      oldnp = &(x1a->tbl[i]);
      h = strhash(oldnp->data) & (arrSize - 1);
      newnp = &(array.tbl[i]);
      if (array.ht[h]) array.ht[h]->from = &(newnp->next);
      newnp->next = array.ht[h];
      newnp->data = oldnp->data;
      newnp->from = &(array.ht[h]);
      array.ht[h] = newnp;
    }
    free(x1a->tbl);
    *x1a = array;
  }
  /* Insert the new data */
  h = ph & (x1a->size - 1);
  np = &(x1a->tbl[x1a->count++]);
  np->data = data;
  if (x1a->ht[h]) x1a->ht[h]->from = &(np->next);
  np->next = x1a->ht[h];
  x1a->ht[h] = np;
  np->from = &(x1a->ht[h]);
  return 1;
}

/* Return a pointer to data assigned to the given key.  Return NULL
** if no such key. */
const char *Strsafe_find(const char *key) {
  unsigned h;
  x1node *np;

  if (x1a == 0) return 0;
  h = strhash(key) & (x1a->size - 1);
  np = x1a->ht[h];
  while (np) {
    if (strcmp(np->data, key) == 0) break;
    np = np->next;
  }
  return np ? np->data : 0;
}

/* Return a pointer to the (terminal or nonterminal) symbol "x".
** Create a new symbol if this is the first time "x" has been seen.
*/
struct symbol *Symbol_new(const char *x) {
  struct symbol *sp;

  sp = Symbol_find(x);
  if (sp == 0) {
    sp = (struct symbol *)calloc(1, sizeof(struct symbol));
    MemoryCheck(sp);
    sp->name = Strsafe(x);
    sp->type = ISUPPER(*x) ? TERMINAL : NONTERMINAL;
    sp->rule = 0;
    sp->fallback = 0;
    sp->prec = -1;
    sp->assoc = UNK;
    sp->firstset = 0;
    sp->lambda = LEMON_FALSE;
    sp->destructor = 0;
    sp->destLineno = 0;
    sp->datatype = 0;
    sp->useCnt = 0;
    Symbol_insert(sp, sp->name);
  }
  sp->useCnt++;
  return sp;
}

/* Compare two symbols for sorting purposes.  Return negative,
** zero, or positive if a is less then, equal to, or greater
** than b.
**
** Symbols that begin with upper case letters (terminals or tokens)
** must sort before symbols that begin with lower case letters
** (non-terminals).  And MULTITERMINAL symbols (created using the
** %token_class directive) must sort at the very end. Other than
** that, the order does not matter.
**
** We find experimentally that leaving the symbols in their original
** order (the order they appeared in the grammar file) gives the
** smallest parser tables in SQLite.
*/
int Symbolcmpp(const void *_a, const void *_b) {
  const struct symbol *a = *(const struct symbol **)_a;
  const struct symbol *b = *(const struct symbol **)_b;
  int i1 = a->type == MULTITERMINAL ? 3 : a->name[0] > 'Z' ? 2 : 1;
  int i2 = b->type == MULTITERMINAL ? 3 : b->name[0] > 'Z' ? 2 : 1;
  return i1 == i2 ? a->index - b->index : i1 - i2;
}

/* There is one instance of the following structure for each
** associative array of type "x2".
*/
struct s_x2 {
  int size;             /* The number of available slots. */
                        /*   Must be a power of 2 greater than or */
                        /*   equal to 1 */
  int count;            /* Number of currently slots filled */
  struct s_x2node *tbl; /* The data stored here */
  struct s_x2node **ht; /* Hash table for lookups */
};

/* There is one instance of this structure for every data element
** in an associative array of type "x2".
*/
typedef struct s_x2node {
  struct symbol *data;    /* The data */
  const char *key;        /* The key */
  struct s_x2node *next;  /* Next entry with the same hash */
  struct s_x2node **from; /* Previous link */
} x2node;

/* There is only one instance of the array, which is the following */
static struct s_x2 *x2a;

/* Allocate a new associative array */
void Symbol_init(void) {
  if (x2a) return;
  x2a = (struct s_x2 *)malloc(sizeof(struct s_x2));
  if (x2a) {
    x2a->size = 128;
    x2a->count = 0;
    x2a->tbl = (x2node *)calloc(128, sizeof(x2node) + sizeof(x2node *));
    if (x2a->tbl == 0) {
      free(x2a);
      x2a = 0;
    } else {
      int i;
      x2a->ht = (x2node **)&(x2a->tbl[128]);
      for (i = 0; i < 128; i++) x2a->ht[i] = 0;
    }
  }
}
/* Insert a new record into the array.  Return TRUE if successful.
** Prior data with the same key is NOT overwritten */
int Symbol_insert(struct symbol *data, const char *key) {
  x2node *np;
  unsigned h;
  unsigned ph;

  if (x2a == 0) return 0;
  ph = strhash(key);
  h = ph & (x2a->size - 1);
  np = x2a->ht[h];
  while (np) {
    if (strcmp(np->key, key) == 0) {
      /* An existing entry with the same key is found. */
      /* Fail because overwrite is not allows. */
      return 0;
    }
    np = np->next;
  }
  if (x2a->count >= x2a->size) {
    /* Need to make the hash table bigger */
    int i, arrSize;
    struct s_x2 array;
    array.size = arrSize = x2a->size * 2;
    array.count = x2a->count;
    array.tbl = (x2node *)calloc(arrSize, sizeof(x2node) + sizeof(x2node *));
    if (array.tbl == 0) return 0; /* Fail due to malloc failure */
    array.ht = (x2node **)&(array.tbl[arrSize]);
    for (i = 0; i < arrSize; i++) array.ht[i] = 0;
    for (i = 0; i < x2a->count; i++) {
      x2node *oldnp, *newnp;
      oldnp = &(x2a->tbl[i]);
      h = strhash(oldnp->key) & (arrSize - 1);
      newnp = &(array.tbl[i]);
      if (array.ht[h]) array.ht[h]->from = &(newnp->next);
      newnp->next = array.ht[h];
      newnp->key = oldnp->key;
      newnp->data = oldnp->data;
      newnp->from = &(array.ht[h]);
      array.ht[h] = newnp;
    }
    free(x2a->tbl);
    *x2a = array;
  }
  /* Insert the new data */
  h = ph & (x2a->size - 1);
  np = &(x2a->tbl[x2a->count++]);
  np->key = key;
  np->data = data;
  if (x2a->ht[h]) x2a->ht[h]->from = &(np->next);
  np->next = x2a->ht[h];
  x2a->ht[h] = np;
  np->from = &(x2a->ht[h]);
  return 1;
}

/* Return a pointer to data assigned to the given key.  Return NULL
** if no such key. */
struct symbol *Symbol_find(const char *key) {
  unsigned h;
  x2node *np;

  if (x2a == 0) return 0;
  h = strhash(key) & (x2a->size - 1);
  np = x2a->ht[h];
  while (np) {
    if (strcmp(np->key, key) == 0) break;
    np = np->next;
  }
  return np ? np->data : 0;
}

/* Return the n-th data.  Return NULL if n is out of range. */
struct symbol *Symbol_Nth(int n) {
  struct symbol *data;
  if (x2a && n > 0 && n <= x2a->count) {
    data = x2a->tbl[n - 1].data;
  } else {
    data = 0;
  }
  return data;
}

/* Return the size of the array */
int Symbol_count() {
  return x2a ? x2a->count : 0;
}

/* Return an array of pointers to all data in the table.
** The array is obtained from malloc.  Return NULL if memory allocation
** problems, or if the array is empty. */
struct symbol **Symbol_arrayof() {
  struct symbol **array;
  int i, arrSize;
  if (x2a == 0) return 0;
  arrSize = x2a->count;
  array = (struct symbol **)calloc(arrSize, sizeof(struct symbol *));
  if (array) {
    for (i = 0; i < arrSize; i++) array[i] = x2a->tbl[i].data;
  }
  return array;
}

/* Compare two configurations */
int Configcmp(const char *_a, const char *_b) {
  const struct config *a = (struct config *)_a;
  const struct config *b = (struct config *)_b;
  int x;
  x = a->rp->index - b->rp->index;
  if (x == 0) x = a->dot - b->dot;
  return x;
}

/* Compare two states */
PRIVATE int statecmp(struct config *a, struct config *b) {
  int rc;
  for (rc = 0; rc == 0 && a && b; a = a->bp, b = b->bp) {
    rc = a->rp->index - b->rp->index;
    if (rc == 0) rc = a->dot - b->dot;
  }
  if (rc == 0) {
    if (a) rc = 1;
    if (b) rc = -1;
  }
  return rc;
}

/* Hash a state */
PRIVATE unsigned statehash(struct config *a) {
  unsigned h = 0;
  while (a) {
    h = h * 571 + a->rp->index * 37 + a->dot;
    a = a->bp;
  }
  return h;
}

/* Allocate a new state structure */
struct state *State_new() {
  struct state *newstate;
  newstate = (struct state *)calloc(1, sizeof(struct state));
  MemoryCheck(newstate);
  return newstate;
}

/* There is one instance of the following structure for each
** associative array of type "x3".
*/
struct s_x3 {
  int size;             /* The number of available slots. */
                        /*   Must be a power of 2 greater than or */
                        /*   equal to 1 */
  int count;            /* Number of currently slots filled */
  struct s_x3node *tbl; /* The data stored here */
  struct s_x3node **ht; /* Hash table for lookups */
};

/* There is one instance of this structure for every data element
** in an associative array of type "x3".
*/
typedef struct s_x3node {
  struct state *data;     /* The data */
  struct config *key;     /* The key */
  struct s_x3node *next;  /* Next entry with the same hash */
  struct s_x3node **from; /* Previous link */
} x3node;

/* There is only one instance of the array, which is the following */
static struct s_x3 *x3a;

/* Allocate a new associative array */
void State_init(void) {
  if (x3a) return;
  x3a = (struct s_x3 *)malloc(sizeof(struct s_x3));
  if (x3a) {
    x3a->size = 128;
    x3a->count = 0;
    x3a->tbl = (x3node *)calloc(128, sizeof(x3node) + sizeof(x3node *));
    if (x3a->tbl == 0) {
      free(x3a);
      x3a = 0;
    } else {
      int i;
      x3a->ht = (x3node **)&(x3a->tbl[128]);
      for (i = 0; i < 128; i++) x3a->ht[i] = 0;
    }
  }
}
/* Insert a new record into the array.  Return TRUE if successful.
** Prior data with the same key is NOT overwritten */
int State_insert(struct state *data, struct config *key) {
  x3node *np;
  unsigned h;
  unsigned ph;

  if (x3a == 0) return 0;
  ph = statehash(key);
  h = ph & (x3a->size - 1);
  np = x3a->ht[h];
  while (np) {
    if (statecmp(np->key, key) == 0) {
      /* An existing entry with the same key is found. */
      /* Fail because overwrite is not allows. */
      return 0;
    }
    np = np->next;
  }
  if (x3a->count >= x3a->size) {
    /* Need to make the hash table bigger */
    int i, arrSize;
    struct s_x3 array;
    array.size = arrSize = x3a->size * 2;
    array.count = x3a->count;
    array.tbl = (x3node *)calloc(arrSize, sizeof(x3node) + sizeof(x3node *));
    if (array.tbl == 0) return 0; /* Fail due to malloc failure */
    array.ht = (x3node **)&(array.tbl[arrSize]);
    for (i = 0; i < arrSize; i++) array.ht[i] = 0;
    for (i = 0; i < x3a->count; i++) {
      x3node *oldnp, *newnp;
      oldnp = &(x3a->tbl[i]);
      h = statehash(oldnp->key) & (arrSize - 1);
      newnp = &(array.tbl[i]);
      if (array.ht[h]) array.ht[h]->from = &(newnp->next);
      newnp->next = array.ht[h];
      newnp->key = oldnp->key;
      newnp->data = oldnp->data;
      newnp->from = &(array.ht[h]);
      array.ht[h] = newnp;
    }
    free(x3a->tbl);
    *x3a = array;
  }
  /* Insert the new data */
  h = ph & (x3a->size - 1);
  np = &(x3a->tbl[x3a->count++]);
  np->key = key;
  np->data = data;
  if (x3a->ht[h]) x3a->ht[h]->from = &(np->next);
  np->next = x3a->ht[h];
  x3a->ht[h] = np;
  np->from = &(x3a->ht[h]);
  return 1;
}

/* Return a pointer to data assigned to the given key.  Return NULL
** if no such key. */
struct state *State_find(struct config *key) {
  unsigned h;
  x3node *np;

  if (x3a == 0) return 0;
  h = statehash(key) & (x3a->size - 1);
  np = x3a->ht[h];
  while (np) {
    if (statecmp(np->key, key) == 0) break;
    np = np->next;
  }
  return np ? np->data : 0;
}

/* Return an array of pointers to all data in the table.
** The array is obtained from malloc.  Return NULL if memory allocation
** problems, or if the array is empty. */
struct state **State_arrayof(void) {
  struct state **array;
  int i, arrSize;
  if (x3a == 0) return 0;
  arrSize = x3a->count;
  array = (struct state **)calloc(arrSize, sizeof(struct state *));
  if (array) {
    for (i = 0; i < arrSize; i++) array[i] = x3a->tbl[i].data;
  }
  return array;
}

/* Hash a configuration */
PRIVATE unsigned confighash(struct config *a) {
  unsigned h = 0;
  h = h * 571 + a->rp->index * 37 + a->dot;
  return h;
}

/* There is one instance of the following structure for each
** associative array of type "x4".
*/
struct s_x4 {
  int size;             /* The number of available slots. */
                        /*   Must be a power of 2 greater than or */
                        /*   equal to 1 */
  int count;            /* Number of currently slots filled */
  struct s_x4node *tbl; /* The data stored here */
  struct s_x4node **ht; /* Hash table for lookups */
};

/* There is one instance of this structure for every data element
** in an associative array of type "x4".
*/
typedef struct s_x4node {
  struct config *data;    /* The data */
  struct s_x4node *next;  /* Next entry with the same hash */
  struct s_x4node **from; /* Previous link */
} x4node;

/* There is only one instance of the array, which is the following */
static struct s_x4 *x4a;

/* Allocate a new associative array */
void Configtable_init(void) {
  if (x4a) return;
  x4a = (struct s_x4 *)malloc(sizeof(struct s_x4));
  if (x4a) {
    x4a->size = 64;
    x4a->count = 0;
    x4a->tbl = (x4node *)calloc(64, sizeof(x4node) + sizeof(x4node *));
    if (x4a->tbl == 0) {
      free(x4a);
      x4a = 0;
    } else {
      int i;
      x4a->ht = (x4node **)&(x4a->tbl[64]);
      for (i = 0; i < 64; i++) x4a->ht[i] = 0;
    }
  }
}
/* Insert a new record into the array.  Return TRUE if successful.
** Prior data with the same key is NOT overwritten */
int Configtable_insert(struct config *data) {
  x4node *np;
  unsigned h;
  unsigned ph;

  if (x4a == 0) return 0;
  ph = confighash(data);
  h = ph & (x4a->size - 1);
  np = x4a->ht[h];
  while (np) {
    if (Configcmp((const char *)np->data, (const char *)data) == 0) {
      /* An existing entry with the same key is found. */
      /* Fail because overwrite is not allows. */
      return 0;
    }
    np = np->next;
  }
  if (x4a->count >= x4a->size) {
    /* Need to make the hash table bigger */
    int i, arrSize;
    struct s_x4 array;
    array.size = arrSize = x4a->size * 2;
    array.count = x4a->count;
    array.tbl = (x4node *)calloc(arrSize, sizeof(x4node) + sizeof(x4node *));
    if (array.tbl == 0) return 0; /* Fail due to malloc failure */
    array.ht = (x4node **)&(array.tbl[arrSize]);
    for (i = 0; i < arrSize; i++) array.ht[i] = 0;
    for (i = 0; i < x4a->count; i++) {
      x4node *oldnp, *newnp;
      oldnp = &(x4a->tbl[i]);
      h = confighash(oldnp->data) & (arrSize - 1);
      newnp = &(array.tbl[i]);
      if (array.ht[h]) array.ht[h]->from = &(newnp->next);
      newnp->next = array.ht[h];
      newnp->data = oldnp->data;
      newnp->from = &(array.ht[h]);
      array.ht[h] = newnp;
    }
    free(x4a->tbl);
    *x4a = array;
  }
  /* Insert the new data */
  h = ph & (x4a->size - 1);
  np = &(x4a->tbl[x4a->count++]);
  np->data = data;
  if (x4a->ht[h]) x4a->ht[h]->from = &(np->next);
  np->next = x4a->ht[h];
  x4a->ht[h] = np;
  np->from = &(x4a->ht[h]);
  return 1;
}

/* Return a pointer to data assigned to the given key.  Return NULL
** if no such key. */
struct config *Configtable_find(struct config *key) {
  int h;
  x4node *np;

  if (x4a == 0) return 0;
  h = confighash(key) & (x4a->size - 1);
  np = x4a->ht[h];
  while (np) {
    if (Configcmp((const char *)np->data, (const char *)key) == 0) break;
    np = np->next;
  }
  return np ? np->data : 0;
}

/* Remove all data from the table.  Pass each data to the function "f"
** as it is removed.  ("f" may be null to avoid this step.) */
void Configtable_clear(int (*f)(struct config *)) {
  int i;
  if (x4a == 0 || x4a->count == 0) return;
  if (f)
    for (i = 0; i < x4a->count; i++) (*f)(x4a->tbl[i].data);
  for (i = 0; i < x4a->size; i++) x4a->ht[i] = 0;
  x4a->count = 0;
  return;
}