237 lines
5.3 KiB
C++
237 lines
5.3 KiB
C++
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#line 1 "hb-number-parser.rl"
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/*
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* Copyright © 2019 Ebrahim Byagowi
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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*/
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#ifndef HB_NUMBER_PARSER_HH
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#define HB_NUMBER_PARSER_HH
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#include "hb.hh"
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#line 35 "hb-number-parser.hh"
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static const unsigned char _double_parser_trans_keys[] = {
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0u, 0u, 43u, 57u, 46u, 57u, 48u, 57u, 43u, 57u, 48u, 57u, 48u, 101u, 48u, 57u,
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46u, 101u, 0
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};
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static const char _double_parser_key_spans[] = {
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0, 15, 12, 10, 15, 10, 54, 10,
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56
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};
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static const unsigned char _double_parser_index_offsets[] = {
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0, 0, 16, 29, 40, 56, 67, 122,
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133
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};
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static const char _double_parser_indicies[] = {
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0, 1, 2, 3, 1, 4, 4,
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4, 4, 4, 4, 4, 4, 4, 4,
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1, 3, 1, 4, 4, 4, 4, 4,
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4, 4, 4, 4, 4, 1, 5, 5,
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5, 5, 5, 5, 5, 5, 5, 5,
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1, 6, 1, 7, 1, 1, 8, 8,
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8, 8, 8, 8, 8, 8, 8, 8,
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1, 8, 8, 8, 8, 8, 8, 8,
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8, 8, 8, 1, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 9, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 9, 1, 8, 8, 8, 8, 8,
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8, 8, 8, 8, 8, 1, 3, 1,
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4, 4, 4, 4, 4, 4, 4, 4,
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4, 4, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 9, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 9, 1, 0
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};
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static const char _double_parser_trans_targs[] = {
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2, 0, 2, 3, 8, 6, 5, 5,
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7, 4
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};
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static const char _double_parser_trans_actions[] = {
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0, 0, 1, 0, 2, 3, 0, 4,
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5, 0
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};
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static const int double_parser_start = 1;
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static const int double_parser_first_final = 6;
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static const int double_parser_error = 0;
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static const int double_parser_en_main = 1;
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#line 68 "hb-number-parser.rl"
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/* Works only for n < 512 */
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static inline double
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_pow10 (unsigned exponent)
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{
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static const double _powers_of_10[] =
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{
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1.0e+256,
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1.0e+128,
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1.0e+64,
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1.0e+32,
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1.0e+16,
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1.0e+8,
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10000.,
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100.,
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10.
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};
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unsigned mask = 1 << (ARRAY_LENGTH (_powers_of_10) - 1);
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double result = 1;
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for (const double *power = _powers_of_10; mask; ++power, mask >>= 1)
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if (exponent & mask) result *= *power;
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return result;
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}
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/* a variant of strtod that also gets end of buffer in its second argument */
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static inline double
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strtod_rl (const char *p, const char **end_ptr /* IN/OUT */)
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{
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double value = 0;
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double frac = 0;
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double frac_count = 0;
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unsigned exp = 0;
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bool neg = false, exp_neg = false, exp_overflow = false;
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const unsigned long long MAX_FRACT = 0xFFFFFFFFFFFFFull; /* 2^52-1 */
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const unsigned MAX_EXP = 0x7FFu; /* 2^11-1 */
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const char *pe = *end_ptr;
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while (p < pe && ISSPACE (*p))
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p++;
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int cs;
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#line 139 "hb-number-parser.hh"
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{
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cs = double_parser_start;
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}
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#line 144 "hb-number-parser.hh"
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{
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int _slen;
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int _trans;
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const unsigned char *_keys;
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const char *_inds;
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if ( p == pe )
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goto _test_eof;
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if ( cs == 0 )
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goto _out;
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_resume:
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_keys = _double_parser_trans_keys + (cs<<1);
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_inds = _double_parser_indicies + _double_parser_index_offsets[cs];
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_slen = _double_parser_key_spans[cs];
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_trans = _inds[ _slen > 0 && _keys[0] <=(*p) &&
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(*p) <= _keys[1] ?
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(*p) - _keys[0] : _slen ];
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cs = _double_parser_trans_targs[_trans];
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if ( _double_parser_trans_actions[_trans] == 0 )
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goto _again;
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switch ( _double_parser_trans_actions[_trans] ) {
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case 1:
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#line 37 "hb-number-parser.rl"
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{ neg = true; }
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break;
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case 4:
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#line 38 "hb-number-parser.rl"
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{ exp_neg = true; }
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break;
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case 2:
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#line 40 "hb-number-parser.rl"
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{
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value = value * 10. + ((*p) - '0');
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}
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break;
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case 3:
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#line 43 "hb-number-parser.rl"
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{
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if (likely (frac <= MAX_FRACT / 10))
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{
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frac = frac * 10. + ((*p) - '0');
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++frac_count;
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}
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}
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break;
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case 5:
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#line 50 "hb-number-parser.rl"
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{
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if (likely (exp * 10 + ((*p) - '0') <= MAX_EXP))
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exp = exp * 10 + ((*p) - '0');
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else
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exp_overflow = true;
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}
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break;
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#line 202 "hb-number-parser.hh"
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}
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_again:
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if ( cs == 0 )
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goto _out;
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if ( ++p != pe )
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goto _resume;
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_test_eof: {}
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_out: {}
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}
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#line 113 "hb-number-parser.rl"
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*end_ptr = p;
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if (frac_count) value += frac / _pow10 (frac_count);
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if (neg) value *= -1.;
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if (unlikely (exp_overflow))
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{
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if (value == 0) return value;
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if (exp_neg) return neg ? -DBL_MIN : DBL_MIN;
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else return neg ? -DBL_MAX : DBL_MAX;
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}
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if (exp)
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{
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if (exp_neg) value /= _pow10 (exp);
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else value *= _pow10 (exp);
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}
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return value;
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}
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#endif /* HB_NUMBER_PARSER_HH */
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