105 lines
3.5 KiB
C
105 lines
3.5 KiB
C
/*
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* Number-to-string conversion. The semantics of these is very tightly
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* bound with the ECMAScript semantics required for call sites.
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*/
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#if !defined(DUK_NUMCONV_H_INCLUDED)
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#define DUK_NUMCONV_H_INCLUDED
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/* Output a specified number of digits instead of using the shortest
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* form. Used for toPrecision() and toFixed().
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*/
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#define DUK_N2S_FLAG_FIXED_FORMAT (1U << 0)
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/* Force exponential format. Used for toExponential(). */
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#define DUK_N2S_FLAG_FORCE_EXP (1U << 1)
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/* If number would need zero padding (for whole number part), use
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* exponential format instead. E.g. if input number is 12300, 3
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* digits are generated ("123"), output "1.23e+4" instead of "12300".
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* Used for toPrecision().
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*/
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#define DUK_N2S_FLAG_NO_ZERO_PAD (1U << 2)
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/* Digit count indicates number of fractions (i.e. an absolute
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* digit index instead of a relative one). Used together with
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* DUK_N2S_FLAG_FIXED_FORMAT for toFixed().
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*/
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#define DUK_N2S_FLAG_FRACTION_DIGITS (1U << 3)
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/*
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* String-to-number conversion
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*/
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/* Maximum exponent value when parsing numbers. This is not strictly
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* compliant as there should be no upper limit, but as we parse the
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* exponent without a bigint, impose some limit. The limit should be
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* small enough that multiplying it (or limit-1 to be precise) won't
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* overflow signed 32-bit integer range. Exponent is only parsed with
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* radix 10, but with maximum radix (36) a safe limit is:
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* (10000000*36).toString(16) -> '15752a00'
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*/
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#define DUK_S2N_MAX_EXPONENT 10000000L
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/* Trim white space (= allow leading and trailing whitespace) */
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#define DUK_S2N_FLAG_TRIM_WHITE (1U << 0)
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/* Allow exponent */
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#define DUK_S2N_FLAG_ALLOW_EXP (1U << 1)
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/* Allow trailing garbage (e.g. treat "123foo" as "123) */
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#define DUK_S2N_FLAG_ALLOW_GARBAGE (1U << 2)
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/* Allow leading plus sign */
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#define DUK_S2N_FLAG_ALLOW_PLUS (1U << 3)
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/* Allow leading minus sign */
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#define DUK_S2N_FLAG_ALLOW_MINUS (1U << 4)
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/* Allow 'Infinity' */
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#define DUK_S2N_FLAG_ALLOW_INF (1U << 5)
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/* Allow fraction part */
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#define DUK_S2N_FLAG_ALLOW_FRAC (1U << 6)
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/* Allow naked fraction (e.g. ".123") */
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#define DUK_S2N_FLAG_ALLOW_NAKED_FRAC (1U << 7)
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/* Allow empty fraction (e.g. "123.") */
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#define DUK_S2N_FLAG_ALLOW_EMPTY_FRAC (1U << 8)
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/* Allow empty string to be interpreted as 0 */
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#define DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO (1U << 9)
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/* Allow leading zeroes (e.g. "0123" -> "123") */
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#define DUK_S2N_FLAG_ALLOW_LEADING_ZERO (1U << 10)
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/* Allow automatic detection of hex base ("0x" or "0X" prefix),
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* overrides radix argument and forces integer mode.
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*/
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#define DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT (1U << 11)
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/* Allow automatic detection of legacy octal base ("0n"),
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* overrides radix argument and forces integer mode.
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*/
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#define DUK_S2N_FLAG_ALLOW_AUTO_LEGACY_OCT_INT (1U << 12)
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/* Allow automatic detection of ES2015 octal base ("0o123"),
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* overrides radix argument and forces integer mode.
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*/
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#define DUK_S2N_FLAG_ALLOW_AUTO_OCT_INT (1U << 13)
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/* Allow automatic detection of ES2015 binary base ("0b10001"),
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* overrides radix argument and forces integer mode.
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*/
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#define DUK_S2N_FLAG_ALLOW_AUTO_BIN_INT (1U << 14)
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/*
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* Prototypes
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*/
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DUK_INTERNAL_DECL void duk_numconv_stringify(duk_hthread *thr, duk_small_int_t radix, duk_small_int_t digits, duk_small_uint_t flags);
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DUK_INTERNAL_DECL void duk_numconv_parse(duk_hthread *thr, duk_small_int_t radix, duk_small_uint_t flags);
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#endif /* DUK_NUMCONV_H_INCLUDED */
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