1084 lines
37 KiB
Plaintext
1084 lines
37 KiB
Plaintext
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/stdio/stdio.h"
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#include "libc/assert.h"
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/*
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** 2000-05-29
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** Driver template for the LEMON parser generator.
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**
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** The "lemon" program processes an LALR(1) input grammar file, then uses
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** this template to construct a parser. The "lemon" program inserts text
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** at each "%%" line. Also, any "P-a-r-s-e" identifer prefix (without the
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** interstitial "-" characters) contained in this template is changed into
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** the value of the %name directive from the grammar. Otherwise, the content
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** of this template is copied straight through into the generate parser
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** source file.
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**
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** The following is the concatenation of all %include directives from the
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** input grammar file:
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*/
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/************ Begin %include sections from the grammar ************************/
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%%
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/**************** End of %include directives **********************************/
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/* These constants specify the various numeric values for terminal symbols.
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***************** Begin token definitions *************************************/
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%%
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/**************** End token definitions ***************************************/
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/* The next sections is a series of control #defines.
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** various aspects of the generated parser.
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** YYCODETYPE is the data type used to store the integer codes
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** that represent terminal and non-terminal symbols.
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** "unsigned char" is used if there are fewer than
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** 256 symbols. Larger types otherwise.
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** YYNOCODE is a number of type YYCODETYPE that is not used for
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** any terminal or nonterminal symbol.
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** YYFALLBACK If defined, this indicates that one or more tokens
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** (also known as: "terminal symbols") have fall-back
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** values which should be used if the original symbol
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** would not parse. This permits keywords to sometimes
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** be used as identifiers, for example.
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** YYACTIONTYPE is the data type used for "action codes" - numbers
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** that indicate what to do in response to the next
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** token.
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** ParseTOKENTYPE is the data type used for minor type for terminal
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** symbols. Background: A "minor type" is a semantic
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** value associated with a terminal or non-terminal
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** symbols. For example, for an "ID" terminal symbol,
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** the minor type might be the name of the identifier.
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** Each non-terminal can have a different minor type.
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** Terminal symbols all have the same minor type, though.
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** This macros defines the minor type for terminal
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** symbols.
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** YYMINORTYPE is the data type used for all minor types.
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** This is typically a union of many types, one of
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** which is ParseTOKENTYPE. The entry in the union
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** for terminal symbols is called "yy0".
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** YYSTACKDEPTH is the maximum depth of the parser's stack. If
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** zero the stack is dynamically sized using realloc()
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** ParseARG_SDECL A static variable declaration for the %extra_argument
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** ParseARG_PDECL A parameter declaration for the %extra_argument
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** ParseARG_PARAM Code to pass %extra_argument as a subroutine parameter
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** ParseARG_STORE Code to store %extra_argument into yypParser
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** ParseARG_FETCH Code to extract %extra_argument from yypParser
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** ParseCTX_* As ParseARG_ except for %extra_context
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** YYERRORSYMBOL is the code number of the error symbol. If not
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** defined, then do no error processing.
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** YYNSTATE the combined number of states.
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** YYNRULE the number of rules in the grammar
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** YYNTOKEN Number of terminal symbols
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** YY_MAX_SHIFT Maximum value for shift actions
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** YY_MIN_SHIFTREDUCE Minimum value for shift-reduce actions
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** YY_MAX_SHIFTREDUCE Maximum value for shift-reduce actions
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** YY_ERROR_ACTION The yy_action[] code for syntax error
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** YY_ACCEPT_ACTION The yy_action[] code for accept
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** YY_NO_ACTION The yy_action[] code for no-op
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** YY_MIN_REDUCE Minimum value for reduce actions
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** YY_MAX_REDUCE Maximum value for reduce actions
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*/
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#ifndef INTERFACE
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# define INTERFACE 1
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#endif
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/************* Begin control #defines *****************************************/
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%%
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/************* End control #defines *******************************************/
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#define YY_NLOOKAHEAD ((int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])))
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/* Define the yytestcase() macro to be a no-op if is not already defined
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** otherwise.
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**
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** Applications can choose to define yytestcase() in the %include section
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** to a macro that can assist in verifying code coverage. For production
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** code the yytestcase() macro should be turned off. But it is useful
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** for testing.
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*/
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#ifndef yytestcase
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# define yytestcase(X)
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#endif
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/* Next are the tables used to determine what action to take based on the
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** current state and lookahead token. These tables are used to implement
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** functions that take a state number and lookahead value and return an
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** action integer.
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**
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** Suppose the action integer is N. Then the action is determined as
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** follows
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**
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** 0 <= N <= YY_MAX_SHIFT Shift N. That is, push the lookahead
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** token onto the stack and goto state N.
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**
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** N between YY_MIN_SHIFTREDUCE Shift to an arbitrary state then
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** and YY_MAX_SHIFTREDUCE reduce by rule N-YY_MIN_SHIFTREDUCE.
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**
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** N == YY_ERROR_ACTION A syntax error has occurred.
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**
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** N == YY_ACCEPT_ACTION The parser accepts its input.
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**
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** N == YY_NO_ACTION No such action. Denotes unused
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** slots in the yy_action[] table.
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**
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** N between YY_MIN_REDUCE Reduce by rule N-YY_MIN_REDUCE
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** and YY_MAX_REDUCE
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**
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** The action table is constructed as a single large table named yy_action[].
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** Given state S and lookahead X, the action is computed as either:
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**
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** (A) N = yy_action[ yy_shift_ofst[S] + X ]
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** (B) N = yy_default[S]
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**
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** The (A) formula is preferred. The B formula is used instead if
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** yy_lookahead[yy_shift_ofst[S]+X] is not equal to X.
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**
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** The formulas above are for computing the action when the lookahead is
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** a terminal symbol. If the lookahead is a non-terminal (as occurs after
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** a reduce action) then the yy_reduce_ofst[] array is used in place of
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** the yy_shift_ofst[] array.
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**
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** The following are the tables generated in this section:
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**
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** yy_action[] A single table containing all actions.
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** yy_lookahead[] A table containing the lookahead for each entry in
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** yy_action. Used to detect hash collisions.
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** yy_shift_ofst[] For each state, the offset into yy_action for
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** shifting terminals.
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** yy_reduce_ofst[] For each state, the offset into yy_action for
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** shifting non-terminals after a reduce.
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** yy_default[] Default action for each state.
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**
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*********** Begin parsing tables **********************************************/
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%%
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/********** End of lemon-generated parsing tables *****************************/
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/* The next table maps tokens (terminal symbols) into fallback tokens.
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** If a construct like the following:
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**
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** %fallback ID X Y Z.
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**
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** appears in the grammar, then ID becomes a fallback token for X, Y,
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** and Z. Whenever one of the tokens X, Y, or Z is input to the parser
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** but it does not parse, the type of the token is changed to ID and
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** the parse is retried before an error is thrown.
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**
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** This feature can be used, for example, to cause some keywords in a language
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** to revert to identifiers if they keyword does not apply in the context where
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** it appears.
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*/
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#ifdef YYFALLBACK
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static const YYCODETYPE yyFallback[] = {
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%%
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};
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#endif /* YYFALLBACK */
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/* The following structure represents a single element of the
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** parser's stack. Information stored includes:
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**
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** + The state number for the parser at this level of the stack.
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**
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** + The value of the token stored at this level of the stack.
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** (In other words, the "major" token.)
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**
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** + The semantic value stored at this level of the stack. This is
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** the information used by the action routines in the grammar.
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** It is sometimes called the "minor" token.
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**
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** After the "shift" half of a SHIFTREDUCE action, the stateno field
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** actually contains the reduce action for the second half of the
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** SHIFTREDUCE.
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*/
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struct yyStackEntry {
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YYACTIONTYPE stateno; /* The state-number, or reduce action in SHIFTREDUCE */
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YYCODETYPE major; /* The major token value. This is the code
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** number for the token at this stack level */
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YYMINORTYPE minor; /* The user-supplied minor token value. This
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** is the value of the token */
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};
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typedef struct yyStackEntry yyStackEntry;
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/* The state of the parser is completely contained in an instance of
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** the following structure */
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struct yyParser {
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yyStackEntry *yytos; /* Pointer to top element of the stack */
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#ifdef YYTRACKMAXSTACKDEPTH
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int yyhwm; /* High-water mark of the stack */
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#endif
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#ifndef YYNOERRORRECOVERY
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int yyerrcnt; /* Shifts left before out of the error */
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#endif
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ParseARG_SDECL /* A place to hold %extra_argument */
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ParseCTX_SDECL /* A place to hold %extra_context */
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#if YYSTACKDEPTH<=0
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int yystksz; /* Current side of the stack */
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yyStackEntry *yystack; /* The parser's stack */
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yyStackEntry yystk0; /* First stack entry */
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#else
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yyStackEntry yystack[YYSTACKDEPTH]; /* The parser's stack */
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yyStackEntry *yystackEnd; /* Last entry in the stack */
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#endif
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};
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typedef struct yyParser yyParser;
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#ifndef NDEBUG
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static FILE *yyTraceFILE;
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static char *yyTracePrompt;
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#endif /* NDEBUG */
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#ifndef NDEBUG
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/*
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** Turn parser tracing on by giving a stream to which to write the trace
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** and a prompt to preface each trace message. Tracing is turned off
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** by making either argument NULL
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**
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** Inputs:
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** <ul>
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** <li> A FILE* to which trace output should be written.
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** If NULL, then tracing is turned off.
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** <li> A prefix string written at the beginning of every
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** line of trace output. If NULL, then tracing is
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** turned off.
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** </ul>
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**
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** Outputs:
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** None.
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*/
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void ParseTrace(FILE *TraceFILE, char *zTracePrompt){
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yyTraceFILE = TraceFILE;
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yyTracePrompt = zTracePrompt;
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if( yyTraceFILE==0 ) yyTracePrompt = 0;
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else if( yyTracePrompt==0 ) yyTraceFILE = 0;
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}
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#endif /* NDEBUG */
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#if defined(YYCOVERAGE) || !defined(NDEBUG)
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/* For tracing shifts, the names of all terminals and nonterminals
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** are required. The following table supplies these names */
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static const char *const yyTokenName[] = {
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%%
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};
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#endif /* defined(YYCOVERAGE) || !defined(NDEBUG) */
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#ifndef NDEBUG
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/* For tracing reduce actions, the names of all rules are required.
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*/
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static const char *const yyRuleName[] = {
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%%
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};
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#endif /* NDEBUG */
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#if YYSTACKDEPTH<=0
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/*
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** Try to increase the size of the parser stack. Return the number
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** of errors. Return 0 on success.
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*/
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static int yyGrowStack(yyParser *p){
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int newSize;
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int idx;
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yyStackEntry *pNew;
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newSize = p->yystksz*2 + 100;
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idx = p->yytos ? (int)(p->yytos - p->yystack) : 0;
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if( p->yystack==&p->yystk0 ){
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pNew = malloc(newSize*sizeof(pNew[0]));
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if( pNew ) pNew[0] = p->yystk0;
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}else{
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pNew = realloc(p->yystack, newSize*sizeof(pNew[0]));
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}
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if( pNew ){
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p->yystack = pNew;
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p->yytos = &p->yystack[idx];
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#ifndef NDEBUG
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if( yyTraceFILE ){
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fprintf(yyTraceFILE,"%sStack grows from %d to %d entries.\n",
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yyTracePrompt, p->yystksz, newSize);
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}
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#endif
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p->yystksz = newSize;
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}
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return pNew==0;
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}
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#endif
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/* Datatype of the argument to the memory allocated passed as the
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** second argument to ParseAlloc() below. This can be changed by
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** putting an appropriate #define in the %include section of the input
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** grammar.
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*/
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#ifndef YYMALLOCARGTYPE
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# define YYMALLOCARGTYPE size_t
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#endif
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/* Initialize a new parser that has already been allocated.
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*/
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static void ParseInit(void *yypRawParser ParseCTX_PDECL){
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yyParser *yypParser = (yyParser*)yypRawParser;
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ParseCTX_STORE
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#ifdef YYTRACKMAXSTACKDEPTH
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yypParser->yyhwm = 0;
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#endif
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#if YYSTACKDEPTH<=0
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yypParser->yytos = NULL;
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yypParser->yystack = NULL;
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yypParser->yystksz = 0;
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if( yyGrowStack(yypParser) ){
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yypParser->yystack = &yypParser->yystk0;
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yypParser->yystksz = 1;
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}
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#endif
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#ifndef YYNOERRORRECOVERY
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yypParser->yyerrcnt = -1;
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#endif
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yypParser->yytos = yypParser->yystack;
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yypParser->yystack[0].stateno = 0;
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yypParser->yystack[0].major = 0;
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#if YYSTACKDEPTH>0
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yypParser->yystackEnd = &yypParser->yystack[YYSTACKDEPTH-1];
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#endif
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}
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#ifndef Parse_ENGINEALWAYSONSTACK
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/*
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** This function allocates a new parser.
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** The only argument is a pointer to a function which works like
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** malloc.
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**
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** Inputs:
|
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** A pointer to the function used to allocate memory.
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**
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** Outputs:
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** A pointer to a parser. This pointer is used in subsequent calls
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** to Parse and ParseFree.
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*/
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static void *ParseAlloc(void *(*mallocProc)(YYMALLOCARGTYPE) ParseCTX_PDECL){
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yyParser *yypParser;
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yypParser = (yyParser*)(*mallocProc)( (YYMALLOCARGTYPE)sizeof(yyParser) );
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if( yypParser ){
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ParseCTX_STORE
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ParseInit(yypParser ParseCTX_PARAM);
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}
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return (void*)yypParser;
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}
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#endif /* Parse_ENGINEALWAYSONSTACK */
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/* The following function deletes the "minor type" or semantic value
|
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** associated with a symbol. The symbol can be either a terminal
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** or nonterminal. "yymajor" is the symbol code, and "yypminor" is
|
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** a pointer to the value to be deleted. The code used to do the
|
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** deletions is derived from the %destructor and/or %token_destructor
|
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** directives of the input grammar.
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*/
|
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static void yy_destructor(
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yyParser *yypParser, /* The parser */
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YYCODETYPE yymajor, /* Type code for object to destroy */
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|
YYMINORTYPE *yypminor /* The object to be destroyed */
|
|
){
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ParseARG_FETCH
|
|
ParseCTX_FETCH
|
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switch( yymajor ){
|
|
/* Here is inserted the actions which take place when a
|
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** terminal or non-terminal is destroyed. This can happen
|
|
** when the symbol is popped from the stack during a
|
|
** reduce or during error processing or when a parser is
|
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** being destroyed before it is finished parsing.
|
|
**
|
|
** Note: during a reduce, the only symbols destroyed are those
|
|
** which appear on the RHS of the rule, but which are *not* used
|
|
** inside the C code.
|
|
*/
|
|
/********* Begin destructor definitions ***************************************/
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|
%%
|
|
/********* End destructor definitions *****************************************/
|
|
default: break; /* If no destructor action specified: do nothing */
|
|
}
|
|
}
|
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|
|
/*
|
|
** Pop the parser's stack once.
|
|
**
|
|
** If there is a destructor routine associated with the token which
|
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** is popped from the stack, then call it.
|
|
*/
|
|
static void yy_pop_parser_stack(yyParser *pParser){
|
|
yyStackEntry *yytos;
|
|
assert( pParser->yytos!=0 );
|
|
assert( pParser->yytos > pParser->yystack );
|
|
yytos = pParser->yytos--;
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sPopping %s\n",
|
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yyTracePrompt,
|
|
yyTokenName[yytos->major]);
|
|
}
|
|
#endif
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yy_destructor(pParser, yytos->major, &yytos->minor);
|
|
}
|
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|
|
/*
|
|
** Clear all secondary memory allocations from the parser
|
|
*/
|
|
static void ParseFinalize(void *p){
|
|
yyParser *pParser = (yyParser*)p;
|
|
while( pParser->yytos>pParser->yystack ) yy_pop_parser_stack(pParser);
|
|
#if YYSTACKDEPTH<=0
|
|
if( pParser->yystack!=&pParser->yystk0 ) free(pParser->yystack);
|
|
#endif
|
|
}
|
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|
|
#ifndef Parse_ENGINEALWAYSONSTACK
|
|
/*
|
|
** Deallocate and destroy a parser. Destructors are called for
|
|
** all stack elements before shutting the parser down.
|
|
**
|
|
** If the YYPARSEFREENEVERNULL macro exists (for example because it
|
|
** is defined in a %include section of the input grammar) then it is
|
|
** assumed that the input pointer is never NULL.
|
|
*/
|
|
static void ParseFree(
|
|
void *p, /* The parser to be deleted */
|
|
void (*freeProc)(void*) /* Function used to reclaim memory */
|
|
){
|
|
#ifndef YYPARSEFREENEVERNULL
|
|
if( p==0 ) return;
|
|
#endif
|
|
ParseFinalize(p);
|
|
(*freeProc)(p);
|
|
}
|
|
#endif /* Parse_ENGINEALWAYSONSTACK */
|
|
|
|
/*
|
|
** Return the peak depth of the stack for a parser.
|
|
*/
|
|
#ifdef YYTRACKMAXSTACKDEPTH
|
|
int ParseStackPeak(void *p){
|
|
yyParser *pParser = (yyParser*)p;
|
|
return pParser->yyhwm;
|
|
}
|
|
#endif
|
|
|
|
/* This array of booleans keeps track of the parser statement
|
|
** coverage. The element yycoverage[X][Y] is set when the parser
|
|
** is in state X and has a lookahead token Y. In a well-tested
|
|
** systems, every element of this matrix should end up being set.
|
|
*/
|
|
#if defined(YYCOVERAGE)
|
|
static unsigned char yycoverage[YYNSTATE][YYNTOKEN];
|
|
#endif
|
|
|
|
/*
|
|
** Write into out a description of every state/lookahead combination that
|
|
**
|
|
** (1) has not been used by the parser, and
|
|
** (2) is not a syntax error.
|
|
**
|
|
** Return the number of missed state/lookahead combinations.
|
|
*/
|
|
#if defined(YYCOVERAGE)
|
|
static int ParseCoverage(FILE *out){
|
|
int stateno, iLookAhead, i;
|
|
int nMissed = 0;
|
|
for(stateno=0; stateno<YYNSTATE; stateno++){
|
|
i = yy_shift_ofst[stateno];
|
|
for(iLookAhead=0; iLookAhead<YYNTOKEN; iLookAhead++){
|
|
if( yy_lookahead[i+iLookAhead]!=iLookAhead ) continue;
|
|
if( yycoverage[stateno][iLookAhead]==0 ) nMissed++;
|
|
if( out ){
|
|
fprintf(out,"State %d lookahead %s %s\n", stateno,
|
|
yyTokenName[iLookAhead],
|
|
yycoverage[stateno][iLookAhead] ? "ok" : "missed");
|
|
}
|
|
}
|
|
}
|
|
return nMissed;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
** Find the appropriate action for a parser given the terminal
|
|
** look-ahead token iLookAhead.
|
|
*/
|
|
static YYACTIONTYPE yy_find_shift_action(
|
|
YYCODETYPE iLookAhead, /* The look-ahead token */
|
|
YYACTIONTYPE stateno /* Current state number */
|
|
){
|
|
int i;
|
|
|
|
if( stateno>YY_MAX_SHIFT ) return stateno;
|
|
assert( stateno <= YY_SHIFT_COUNT );
|
|
#if defined(YYCOVERAGE)
|
|
yycoverage[stateno][iLookAhead] = 1;
|
|
#endif
|
|
do{
|
|
i = yy_shift_ofst[stateno];
|
|
assert( i>=0 );
|
|
assert( i<=YY_ACTTAB_COUNT );
|
|
assert( i+YYNTOKEN<=(int)YY_NLOOKAHEAD );
|
|
assert( iLookAhead!=YYNOCODE );
|
|
assert( iLookAhead < YYNTOKEN );
|
|
i += iLookAhead;
|
|
assert( i<(int)YY_NLOOKAHEAD );
|
|
if( yy_lookahead[i]!=iLookAhead ){
|
|
#ifdef YYFALLBACK
|
|
YYCODETYPE iFallback; /* Fallback token */
|
|
assert( iLookAhead<sizeof(yyFallback)/sizeof(yyFallback[0]) );
|
|
iFallback = yyFallback[iLookAhead];
|
|
if( iFallback!=0 ){
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE, "%sFALLBACK %s => %s\n",
|
|
yyTracePrompt, yyTokenName[iLookAhead], yyTokenName[iFallback]);
|
|
}
|
|
#endif
|
|
assert( yyFallback[iFallback]==0 ); /* Fallback loop must terminate */
|
|
iLookAhead = iFallback;
|
|
continue;
|
|
}
|
|
#endif
|
|
#ifdef YYWILDCARD
|
|
{
|
|
int j = i - iLookAhead + YYWILDCARD;
|
|
assert( j<(int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])) );
|
|
if( yy_lookahead[j]==YYWILDCARD && iLookAhead>0 ){
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE, "%sWILDCARD %s => %s\n",
|
|
yyTracePrompt, yyTokenName[iLookAhead],
|
|
yyTokenName[YYWILDCARD]);
|
|
}
|
|
#endif /* NDEBUG */
|
|
return yy_action[j];
|
|
}
|
|
}
|
|
#endif /* YYWILDCARD */
|
|
return yy_default[stateno];
|
|
}else{
|
|
assert( i>=0 && i<(int)(sizeof(yy_action)/sizeof(yy_action[0])) );
|
|
return yy_action[i];
|
|
}
|
|
}while(1);
|
|
}
|
|
|
|
/*
|
|
** Find the appropriate action for a parser given the non-terminal
|
|
** look-ahead token iLookAhead.
|
|
*/
|
|
static YYACTIONTYPE yy_find_reduce_action(
|
|
YYACTIONTYPE stateno, /* Current state number */
|
|
YYCODETYPE iLookAhead /* The look-ahead token */
|
|
){
|
|
int i;
|
|
#ifdef YYERRORSYMBOL
|
|
if( stateno>YY_REDUCE_COUNT ){
|
|
return yy_default[stateno];
|
|
}
|
|
#else
|
|
assert( stateno<=YY_REDUCE_COUNT );
|
|
#endif
|
|
i = yy_reduce_ofst[stateno];
|
|
assert( iLookAhead!=YYNOCODE );
|
|
i += iLookAhead;
|
|
#ifdef YYERRORSYMBOL
|
|
if( i<0 || i>=YY_ACTTAB_COUNT || yy_lookahead[i]!=iLookAhead ){
|
|
return yy_default[stateno];
|
|
}
|
|
#else
|
|
assert( i>=0 && i<YY_ACTTAB_COUNT );
|
|
assert( yy_lookahead[i]==iLookAhead );
|
|
#endif
|
|
return yy_action[i];
|
|
}
|
|
|
|
/*
|
|
** The following routine is called if the stack overflows.
|
|
*/
|
|
static void yyStackOverflow(yyParser *yypParser){
|
|
ParseARG_FETCH
|
|
ParseCTX_FETCH
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sStack Overflow!\n",yyTracePrompt);
|
|
}
|
|
#endif
|
|
while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
|
|
/* Here code is inserted which will execute if the parser
|
|
** stack every overflows */
|
|
/******** Begin %stack_overflow code ******************************************/
|
|
%%
|
|
/******** End %stack_overflow code ********************************************/
|
|
ParseARG_STORE /* Suppress warning about unused %extra_argument var */
|
|
ParseCTX_STORE
|
|
}
|
|
|
|
/*
|
|
** Print tracing information for a SHIFT action
|
|
*/
|
|
#ifndef NDEBUG
|
|
static void yyTraceShift(yyParser *yypParser, int yyNewState, const char *zTag){
|
|
if( yyTraceFILE ){
|
|
if( yyNewState<YYNSTATE ){
|
|
fprintf(yyTraceFILE,"%s%s '%s', go to state %d\n",
|
|
yyTracePrompt, zTag, yyTokenName[yypParser->yytos->major],
|
|
yyNewState);
|
|
}else{
|
|
fprintf(yyTraceFILE,"%s%s '%s', pending reduce %d\n",
|
|
yyTracePrompt, zTag, yyTokenName[yypParser->yytos->major],
|
|
yyNewState - YY_MIN_REDUCE);
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
# define yyTraceShift(X,Y,Z)
|
|
#endif
|
|
|
|
/*
|
|
** Perform a shift action.
|
|
*/
|
|
static void yy_shift(
|
|
yyParser *yypParser, /* The parser to be shifted */
|
|
YYACTIONTYPE yyNewState, /* The new state to shift in */
|
|
YYCODETYPE yyMajor, /* The major token to shift in */
|
|
ParseTOKENTYPE yyMinor /* The minor token to shift in */
|
|
){
|
|
yyStackEntry *yytos;
|
|
yypParser->yytos++;
|
|
#ifdef YYTRACKMAXSTACKDEPTH
|
|
if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
|
|
yypParser->yyhwm++;
|
|
assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack) );
|
|
}
|
|
#endif
|
|
#if YYSTACKDEPTH>0
|
|
if( yypParser->yytos>yypParser->yystackEnd ){
|
|
yypParser->yytos--;
|
|
yyStackOverflow(yypParser);
|
|
return;
|
|
}
|
|
#else
|
|
if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz] ){
|
|
if( yyGrowStack(yypParser) ){
|
|
yypParser->yytos--;
|
|
yyStackOverflow(yypParser);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
if( yyNewState > YY_MAX_SHIFT ){
|
|
yyNewState += YY_MIN_REDUCE - YY_MIN_SHIFTREDUCE;
|
|
}
|
|
yytos = yypParser->yytos;
|
|
yytos->stateno = yyNewState;
|
|
yytos->major = yyMajor;
|
|
yytos->minor.yy0 = yyMinor;
|
|
yyTraceShift(yypParser, yyNewState, "Shift");
|
|
}
|
|
|
|
/* For rule J, yyRuleInfoLhs[J] contains the symbol on the left-hand side
|
|
** of that rule */
|
|
static const YYCODETYPE yyRuleInfoLhs[] = {
|
|
%%
|
|
};
|
|
|
|
/* For rule J, yyRuleInfoNRhs[J] contains the negative of the number
|
|
** of symbols on the right-hand side of that rule. */
|
|
static const signed char yyRuleInfoNRhs[] = {
|
|
%%
|
|
};
|
|
|
|
static void yy_accept(yyParser*); /* Forward Declaration */
|
|
|
|
/*
|
|
** Perform a reduce action and the shift that must immediately
|
|
** follow the reduce.
|
|
**
|
|
** The yyLookahead and yyLookaheadToken parameters provide reduce actions
|
|
** access to the lookahead token (if any). The yyLookahead will be YYNOCODE
|
|
** if the lookahead token has already been consumed. As this procedure is
|
|
** only called from one place, optimizing compilers will in-line it, which
|
|
** means that the extra parameters have no performance impact.
|
|
*/
|
|
static YYACTIONTYPE yy_reduce(
|
|
yyParser *yypParser, /* The parser */
|
|
unsigned int yyruleno, /* Number of the rule by which to reduce */
|
|
int yyLookahead, /* Lookahead token, or YYNOCODE if none */
|
|
ParseTOKENTYPE yyLookaheadToken /* Value of the lookahead token */
|
|
ParseCTX_PDECL /* %extra_context */
|
|
){
|
|
int yygoto; /* The next state */
|
|
YYACTIONTYPE yyact; /* The next action */
|
|
yyStackEntry *yymsp; /* The top of the parser's stack */
|
|
int yysize; /* Amount to pop the stack */
|
|
ParseARG_FETCH
|
|
(void)yyLookahead;
|
|
(void)yyLookaheadToken;
|
|
yymsp = yypParser->yytos;
|
|
#ifndef NDEBUG
|
|
assert( yyruleno<(int)(sizeof(yyRuleName)/sizeof(yyRuleName[0])) );
|
|
if( yyTraceFILE ){
|
|
yysize = yyRuleInfoNRhs[yyruleno];
|
|
if( yysize ){
|
|
fprintf(yyTraceFILE, "%sReduce %d [%s]%s, pop back to state %d.\n",
|
|
yyTracePrompt,
|
|
yyruleno, yyRuleName[yyruleno],
|
|
yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action",
|
|
yymsp[yysize].stateno);
|
|
}else{
|
|
fprintf(yyTraceFILE, "%sReduce %d [%s]%s.\n",
|
|
yyTracePrompt, yyruleno, yyRuleName[yyruleno],
|
|
yyruleno<YYNRULE_WITH_ACTION ? "" : " without external action");
|
|
}
|
|
}
|
|
#endif /* NDEBUG */
|
|
|
|
/* Check that the stack is large enough to grow by a single entry
|
|
** if the RHS of the rule is empty. This ensures that there is room
|
|
** enough on the stack to push the LHS value */
|
|
if( yyRuleInfoNRhs[yyruleno]==0 ){
|
|
#ifdef YYTRACKMAXSTACKDEPTH
|
|
if( (int)(yypParser->yytos - yypParser->yystack)>yypParser->yyhwm ){
|
|
yypParser->yyhwm++;
|
|
assert( yypParser->yyhwm == (int)(yypParser->yytos - yypParser->yystack));
|
|
}
|
|
#endif
|
|
#if YYSTACKDEPTH>0
|
|
if( yypParser->yytos>=yypParser->yystackEnd ){
|
|
yyStackOverflow(yypParser);
|
|
/* The call to yyStackOverflow() above pops the stack until it is
|
|
** empty, causing the main parser loop to exit. So the return value
|
|
** is never used and does not matter. */
|
|
return 0;
|
|
}
|
|
#else
|
|
if( yypParser->yytos>=&yypParser->yystack[yypParser->yystksz-1] ){
|
|
if( yyGrowStack(yypParser) ){
|
|
yyStackOverflow(yypParser);
|
|
/* The call to yyStackOverflow() above pops the stack until it is
|
|
** empty, causing the main parser loop to exit. So the return value
|
|
** is never used and does not matter. */
|
|
return 0;
|
|
}
|
|
yymsp = yypParser->yytos;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
switch( yyruleno ){
|
|
/* Beginning here are the reduction cases. A typical example
|
|
** follows:
|
|
** case 0:
|
|
** #line <lineno> <grammarfile>
|
|
** { ... } // User supplied code
|
|
** #line <lineno> <thisfile>
|
|
** break;
|
|
*/
|
|
/********** Begin reduce actions **********************************************/
|
|
%%
|
|
/********** End reduce actions ************************************************/
|
|
};
|
|
assert( yyruleno<sizeof(yyRuleInfoLhs)/sizeof(yyRuleInfoLhs[0]) );
|
|
yygoto = yyRuleInfoLhs[yyruleno];
|
|
yysize = yyRuleInfoNRhs[yyruleno];
|
|
yyact = yy_find_reduce_action(yymsp[yysize].stateno,(YYCODETYPE)yygoto);
|
|
|
|
/* There are no SHIFTREDUCE actions on nonterminals because the table
|
|
** generator has simplified them to pure REDUCE actions. */
|
|
assert( !(yyact>YY_MAX_SHIFT && yyact<=YY_MAX_SHIFTREDUCE) );
|
|
|
|
/* It is not possible for a REDUCE to be followed by an error */
|
|
assert( yyact!=YY_ERROR_ACTION );
|
|
|
|
yymsp += yysize+1;
|
|
yypParser->yytos = yymsp;
|
|
yymsp->stateno = (YYACTIONTYPE)yyact;
|
|
yymsp->major = (YYCODETYPE)yygoto;
|
|
yyTraceShift(yypParser, yyact, "... then shift");
|
|
return yyact;
|
|
}
|
|
|
|
/*
|
|
** The following code executes when the parse fails
|
|
*/
|
|
#ifndef YYNOERRORRECOVERY
|
|
static void yy_parse_failed(
|
|
yyParser *yypParser /* The parser */
|
|
){
|
|
ParseARG_FETCH
|
|
ParseCTX_FETCH
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sFail!\n",yyTracePrompt);
|
|
}
|
|
#endif
|
|
while( yypParser->yytos>yypParser->yystack ) yy_pop_parser_stack(yypParser);
|
|
/* Here code is inserted which will be executed whenever the
|
|
** parser fails */
|
|
/************ Begin %parse_failure code ***************************************/
|
|
%%
|
|
/************ End %parse_failure code *****************************************/
|
|
ParseARG_STORE /* Suppress warning about unused %extra_argument variable */
|
|
ParseCTX_STORE
|
|
}
|
|
#endif /* YYNOERRORRECOVERY */
|
|
|
|
/*
|
|
** The following code executes when a syntax error first occurs.
|
|
*/
|
|
static void yy_syntax_error(
|
|
yyParser *yypParser, /* The parser */
|
|
int yymajor, /* The major type of the error token */
|
|
ParseTOKENTYPE yyminor /* The minor type of the error token */
|
|
){
|
|
ParseARG_FETCH
|
|
ParseCTX_FETCH
|
|
#define TOKEN yyminor
|
|
/************ Begin %syntax_error code ****************************************/
|
|
%%
|
|
/************ End %syntax_error code ******************************************/
|
|
ParseARG_STORE /* Suppress warning about unused %extra_argument variable */
|
|
ParseCTX_STORE
|
|
}
|
|
|
|
/*
|
|
** The following is executed when the parser accepts
|
|
*/
|
|
static void yy_accept(
|
|
yyParser *yypParser /* The parser */
|
|
){
|
|
ParseARG_FETCH
|
|
ParseCTX_FETCH
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sAccept!\n",yyTracePrompt);
|
|
}
|
|
#endif
|
|
#ifndef YYNOERRORRECOVERY
|
|
yypParser->yyerrcnt = -1;
|
|
#endif
|
|
assert( yypParser->yytos==yypParser->yystack );
|
|
/* Here code is inserted which will be executed whenever the
|
|
** parser accepts */
|
|
/*********** Begin %parse_accept code *****************************************/
|
|
%%
|
|
/*********** End %parse_accept code *******************************************/
|
|
ParseARG_STORE /* Suppress warning about unused %extra_argument variable */
|
|
ParseCTX_STORE
|
|
}
|
|
|
|
/* The main parser program.
|
|
** The first argument is a pointer to a structure obtained from
|
|
** "ParseAlloc" which describes the current state of the parser.
|
|
** The second argument is the major token number. The third is
|
|
** the minor token. The fourth optional argument is whatever the
|
|
** user wants (and specified in the grammar) and is available for
|
|
** use by the action routines.
|
|
**
|
|
** Inputs:
|
|
** <ul>
|
|
** <li> A pointer to the parser (an opaque structure.)
|
|
** <li> The major token number.
|
|
** <li> The minor token number.
|
|
** <li> An option argument of a grammar-specified type.
|
|
** </ul>
|
|
**
|
|
** Outputs:
|
|
** None.
|
|
*/
|
|
static void Parse(
|
|
void *yyp, /* The parser */
|
|
int yymajor, /* The major token code number */
|
|
ParseTOKENTYPE yyminor /* The value for the token */
|
|
ParseARG_PDECL /* Optional %extra_argument parameter */
|
|
){
|
|
YYMINORTYPE yyminorunion;
|
|
YYACTIONTYPE yyact; /* The parser action. */
|
|
#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
|
|
int yyendofinput; /* True if we are at the end of input */
|
|
#endif
|
|
#ifdef YYERRORSYMBOL
|
|
int yyerrorhit = 0; /* True if yymajor has invoked an error */
|
|
#endif
|
|
yyParser *yypParser = (yyParser*)yyp; /* The parser */
|
|
ParseCTX_FETCH
|
|
ParseARG_STORE
|
|
|
|
assert( yypParser->yytos!=0 );
|
|
#if !defined(YYERRORSYMBOL) && !defined(YYNOERRORRECOVERY)
|
|
yyendofinput = (yymajor==0);
|
|
#endif
|
|
|
|
yyact = yypParser->yytos->stateno;
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
if( yyact < YY_MIN_REDUCE ){
|
|
fprintf(yyTraceFILE,"%sInput '%s' in state %d\n",
|
|
yyTracePrompt,yyTokenName[yymajor],yyact);
|
|
}else{
|
|
fprintf(yyTraceFILE,"%sInput '%s' with pending reduce %d\n",
|
|
yyTracePrompt,yyTokenName[yymajor],yyact-YY_MIN_REDUCE);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
do{
|
|
assert( yyact==yypParser->yytos->stateno );
|
|
yyact = yy_find_shift_action((YYCODETYPE)yymajor,yyact);
|
|
if( yyact >= YY_MIN_REDUCE ){
|
|
yyact = yy_reduce(yypParser,yyact-YY_MIN_REDUCE,yymajor,
|
|
yyminor ParseCTX_PARAM);
|
|
}else if( yyact <= YY_MAX_SHIFTREDUCE ){
|
|
yy_shift(yypParser,yyact,(YYCODETYPE)yymajor,yyminor);
|
|
#ifndef YYNOERRORRECOVERY
|
|
yypParser->yyerrcnt--;
|
|
#endif
|
|
break;
|
|
}else if( yyact==YY_ACCEPT_ACTION ){
|
|
yypParser->yytos--;
|
|
yy_accept(yypParser);
|
|
return;
|
|
}else{
|
|
assert( yyact == YY_ERROR_ACTION );
|
|
yyminorunion.yy0 = yyminor;
|
|
#ifdef YYERRORSYMBOL
|
|
int yymx;
|
|
#endif
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sSyntax Error!\n",yyTracePrompt);
|
|
}
|
|
#endif
|
|
#ifdef YYERRORSYMBOL
|
|
/* A syntax error has occurred.
|
|
** The response to an error depends upon whether or not the
|
|
** grammar defines an error token "ERROR".
|
|
**
|
|
** This is what we do if the grammar does define ERROR:
|
|
**
|
|
** * Call the %syntax_error function.
|
|
**
|
|
** * Begin popping the stack until we enter a state where
|
|
** it is legal to shift the error symbol, then shift
|
|
** the error symbol.
|
|
**
|
|
** * Set the error count to three.
|
|
**
|
|
** * Begin accepting and shifting new tokens. No new error
|
|
** processing will occur until three tokens have been
|
|
** shifted successfully.
|
|
**
|
|
*/
|
|
if( yypParser->yyerrcnt<0 ){
|
|
yy_syntax_error(yypParser,yymajor,yyminor);
|
|
}
|
|
yymx = yypParser->yytos->major;
|
|
if( yymx==YYERRORSYMBOL || yyerrorhit ){
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
fprintf(yyTraceFILE,"%sDiscard input token %s\n",
|
|
yyTracePrompt,yyTokenName[yymajor]);
|
|
}
|
|
#endif
|
|
yy_destructor(yypParser, (YYCODETYPE)yymajor, &yyminorunion);
|
|
yymajor = YYNOCODE;
|
|
}else{
|
|
while( yypParser->yytos >= yypParser->yystack
|
|
&& (yyact = yy_find_reduce_action(
|
|
yypParser->yytos->stateno,
|
|
YYERRORSYMBOL)) > YY_MAX_SHIFTREDUCE
|
|
){
|
|
yy_pop_parser_stack(yypParser);
|
|
}
|
|
if( yypParser->yytos < yypParser->yystack || yymajor==0 ){
|
|
yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
|
|
yy_parse_failed(yypParser);
|
|
#ifndef YYNOERRORRECOVERY
|
|
yypParser->yyerrcnt = -1;
|
|
#endif
|
|
yymajor = YYNOCODE;
|
|
}else if( yymx!=YYERRORSYMBOL ){
|
|
yy_shift(yypParser,yyact,YYERRORSYMBOL,yyminor);
|
|
}
|
|
}
|
|
yypParser->yyerrcnt = 3;
|
|
yyerrorhit = 1;
|
|
if( yymajor==YYNOCODE ) break;
|
|
yyact = yypParser->yytos->stateno;
|
|
#elif defined(YYNOERRORRECOVERY)
|
|
/* If the YYNOERRORRECOVERY macro is defined, then do not attempt to
|
|
** do any kind of error recovery. Instead, simply invoke the syntax
|
|
** error routine and continue going as if nothing had happened.
|
|
**
|
|
** Applications can set this macro (for example inside %include) if
|
|
** they intend to abandon the parse upon the first syntax error seen.
|
|
*/
|
|
yy_syntax_error(yypParser,yymajor, yyminor);
|
|
yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
|
|
break;
|
|
#else /* YYERRORSYMBOL is not defined */
|
|
/* This is what we do if the grammar does not define ERROR:
|
|
**
|
|
** * Report an error message, and throw away the input token.
|
|
**
|
|
** * If the input token is $, then fail the parse.
|
|
**
|
|
** As before, subsequent error messages are suppressed until
|
|
** three input tokens have been successfully shifted.
|
|
*/
|
|
if( yypParser->yyerrcnt<=0 ){
|
|
yy_syntax_error(yypParser,yymajor, yyminor);
|
|
}
|
|
yypParser->yyerrcnt = 3;
|
|
yy_destructor(yypParser,(YYCODETYPE)yymajor,&yyminorunion);
|
|
if( yyendofinput ){
|
|
yy_parse_failed(yypParser);
|
|
#ifndef YYNOERRORRECOVERY
|
|
yypParser->yyerrcnt = -1;
|
|
#endif
|
|
}
|
|
break;
|
|
#endif
|
|
}
|
|
}while( yypParser->yytos>yypParser->yystack );
|
|
#ifndef NDEBUG
|
|
if( yyTraceFILE ){
|
|
yyStackEntry *i;
|
|
char cDiv = '[';
|
|
fprintf(yyTraceFILE,"%sReturn. Stack=",yyTracePrompt);
|
|
for(i=&yypParser->yystack[1]; i<=yypParser->yytos; i++){
|
|
fprintf(yyTraceFILE,"%c%s", cDiv, yyTokenName[i->major]);
|
|
cDiv = ' ';
|
|
}
|
|
fprintf(yyTraceFILE,"]\n");
|
|
}
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
/*
|
|
** Return the fallback token corresponding to canonical token iToken, or
|
|
** 0 if iToken has no fallback.
|
|
*/
|
|
static int ParseFallback(int iToken){
|
|
#ifdef YYFALLBACK
|
|
assert( iToken<(int)(sizeof(yyFallback)/sizeof(yyFallback[0])) );
|
|
return yyFallback[iToken];
|
|
#else
|
|
(void)iToken;
|
|
return 0;
|
|
#endif
|
|
}
|