1 /* 2 * Number-to-string conversion. The semantics of these is very tightly 3 * bound with the ECMAScript semantics required for call sites. 4 */ 5 6 #if !defined(DUK_NUMCONV_H_INCLUDED) 7 #define DUK_NUMCONV_H_INCLUDED 8 9 /* Output a specified number of digits instead of using the shortest 10 * form. Used for toPrecision() and toFixed(). 11 */ 12 #define DUK_N2S_FLAG_FIXED_FORMAT (1U << 0) 13 14 /* Force exponential format. Used for toExponential(). */ 15 #define DUK_N2S_FLAG_FORCE_EXP (1U << 1) 16 17 /* If number would need zero padding (for whole number part), use 18 * exponential format instead. E.g. if input number is 12300, 3 19 * digits are generated ("123"), output "1.23e+4" instead of "12300". 20 * Used for toPrecision(). 21 */ 22 #define DUK_N2S_FLAG_NO_ZERO_PAD (1U << 2) 23 24 /* Digit count indicates number of fractions (i.e. an absolute 25 * digit index instead of a relative one). Used together with 26 * DUK_N2S_FLAG_FIXED_FORMAT for toFixed(). 27 */ 28 #define DUK_N2S_FLAG_FRACTION_DIGITS (1U << 3) 29 30 /* 31 * String-to-number conversion 32 */ 33 34 /* Maximum exponent value when parsing numbers. This is not strictly 35 * compliant as there should be no upper limit, but as we parse the 36 * exponent without a bigint, impose some limit. The limit should be 37 * small enough that multiplying it (or limit-1 to be precise) won't 38 * overflow signed 32-bit integer range. Exponent is only parsed with 39 * radix 10, but with maximum radix (36) a safe limit is: 40 * (10000000*36).toString(16) -> '15752a00' 41 */ 42 #define DUK_S2N_MAX_EXPONENT 10000000L 43 44 /* Trim white space (= allow leading and trailing whitespace) */ 45 #define DUK_S2N_FLAG_TRIM_WHITE (1U << 0) 46 47 /* Allow exponent */ 48 #define DUK_S2N_FLAG_ALLOW_EXP (1U << 1) 49 50 /* Allow trailing garbage (e.g. treat "123foo" as "123) */ 51 #define DUK_S2N_FLAG_ALLOW_GARBAGE (1U << 2) 52 53 /* Allow leading plus sign */ 54 #define DUK_S2N_FLAG_ALLOW_PLUS (1U << 3) 55 56 /* Allow leading minus sign */ 57 #define DUK_S2N_FLAG_ALLOW_MINUS (1U << 4) 58 59 /* Allow 'Infinity' */ 60 #define DUK_S2N_FLAG_ALLOW_INF (1U << 5) 61 62 /* Allow fraction part */ 63 #define DUK_S2N_FLAG_ALLOW_FRAC (1U << 6) 64 65 /* Allow naked fraction (e.g. ".123") */ 66 #define DUK_S2N_FLAG_ALLOW_NAKED_FRAC (1U << 7) 67 68 /* Allow empty fraction (e.g. "123.") */ 69 #define DUK_S2N_FLAG_ALLOW_EMPTY_FRAC (1U << 8) 70 71 /* Allow empty string to be interpreted as 0 */ 72 #define DUK_S2N_FLAG_ALLOW_EMPTY_AS_ZERO (1U << 9) 73 74 /* Allow leading zeroes (e.g. "0123" -> "123") */ 75 #define DUK_S2N_FLAG_ALLOW_LEADING_ZERO (1U << 10) 76 77 /* Allow automatic detection of hex base ("0x" or "0X" prefix), 78 * overrides radix argument and forces integer mode. 79 */ 80 #define DUK_S2N_FLAG_ALLOW_AUTO_HEX_INT (1U << 11) 81 82 /* Allow automatic detection of legacy octal base ("0n"), 83 * overrides radix argument and forces integer mode. 84 */ 85 #define DUK_S2N_FLAG_ALLOW_AUTO_LEGACY_OCT_INT (1U << 12) 86 87 /* Allow automatic detection of ES2015 octal base ("0o123"), 88 * overrides radix argument and forces integer mode. 89 */ 90 #define DUK_S2N_FLAG_ALLOW_AUTO_OCT_INT (1U << 13) 91 92 /* Allow automatic detection of ES2015 binary base ("0b10001"), 93 * overrides radix argument and forces integer mode. 94 */ 95 #define DUK_S2N_FLAG_ALLOW_AUTO_BIN_INT (1U << 14) 96 97 /* 98 * Prototypes 99 */ 100 101 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); 102 DUK_INTERNAL_DECL void duk_numconv_parse(duk_hthread *thr, duk_small_int_t radix, duk_small_uint_t flags); 103 104 #endif /* DUK_NUMCONV_H_INCLUDED */ 105