2 #line 1 "hb-number-parser.rl"
4 * Copyright © 2019 Ebrahim Byagowi
6 * This is part of HarfBuzz, a text shaping library.
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
28 #ifndef HB_NUMBER_PARSER_HH
29 #define HB_NUMBER_PARSER_HH
34 #line 35 "hb-number-parser.hh"
35 static const unsigned char _double_parser_trans_keys[] = {
36 0u, 0u, 43u, 57u, 46u, 57u, 48u, 57u, 43u, 57u, 48u, 57u, 48u, 101u, 48u, 57u,
40 static const char _double_parser_key_spans[] = {
41 0, 15, 12, 10, 15, 10, 54, 10,
45 static const unsigned char _double_parser_index_offsets[] = {
46 0, 0, 16, 29, 40, 56, 67, 122,
50 static const char _double_parser_indicies[] = {
52 4, 4, 4, 4, 4, 4, 4, 4,
53 1, 3, 1, 4, 4, 4, 4, 4,
54 4, 4, 4, 4, 4, 1, 5, 5,
55 5, 5, 5, 5, 5, 5, 5, 5,
56 1, 6, 1, 7, 1, 1, 8, 8,
57 8, 8, 8, 8, 8, 8, 8, 8,
58 1, 8, 8, 8, 8, 8, 8, 8,
59 8, 8, 8, 1, 5, 5, 5, 5,
60 5, 5, 5, 5, 5, 5, 1, 1,
61 1, 1, 1, 1, 1, 1, 1, 1,
62 1, 9, 1, 1, 1, 1, 1, 1,
63 1, 1, 1, 1, 1, 1, 1, 1,
64 1, 1, 1, 1, 1, 1, 1, 1,
65 1, 1, 1, 1, 1, 1, 1, 1,
66 1, 9, 1, 8, 8, 8, 8, 8,
67 8, 8, 8, 8, 8, 1, 3, 1,
68 4, 4, 4, 4, 4, 4, 4, 4,
69 4, 4, 1, 1, 1, 1, 1, 1,
70 1, 1, 1, 1, 1, 9, 1, 1,
71 1, 1, 1, 1, 1, 1, 1, 1,
72 1, 1, 1, 1, 1, 1, 1, 1,
73 1, 1, 1, 1, 1, 1, 1, 1,
74 1, 1, 1, 1, 1, 9, 1, 0
77 static const char _double_parser_trans_targs[] = {
78 2, 0, 2, 3, 8, 6, 5, 5,
82 static const char _double_parser_trans_actions[] = {
83 0, 0, 1, 0, 2, 3, 0, 4,
87 static const int double_parser_start = 1;
88 static const int double_parser_first_final = 6;
89 static const int double_parser_error = 0;
91 static const int double_parser_en_main = 1;
94 #line 68 "hb-number-parser.rl"
97 /* Works only for n < 512 */
99 _pow10 (unsigned exponent)
101 static const double _powers_of_10[] =
113 unsigned mask = 1 << (ARRAY_LENGTH (_powers_of_10) - 1);
115 for (const double *power = _powers_of_10; mask; ++power, mask >>= 1)
116 if (exponent & mask) result *= *power;
120 /* a variant of strtod that also gets end of buffer in its second argument */
122 strtod_rl (const char *p, const char **end_ptr /* IN/OUT */)
126 double frac_count = 0;
128 bool neg = false, exp_neg = false, exp_overflow = false;
129 const unsigned long long MAX_FRACT = 0xFFFFFFFFFFFFFull; /* 2^52-1 */
130 const unsigned MAX_EXP = 0x7FFu; /* 2^11-1 */
132 const char *pe = *end_ptr;
133 while (p < pe && ISSPACE (*p))
138 #line 139 "hb-number-parser.hh"
140 cs = double_parser_start;
143 #line 144 "hb-number-parser.hh"
147 const unsigned char *_keys;
154 _keys = _double_parser_trans_keys + (cs<<1);
155 _inds = _double_parser_indicies + _double_parser_index_offsets[cs];
157 _slen = _double_parser_key_spans[cs];
158 _trans = _inds[ _slen > 0 && _keys[0] <=(*p) &&
160 (*p) - _keys[0] : _slen ];
162 cs = _double_parser_trans_targs[_trans];
164 if ( _double_parser_trans_actions[_trans] == 0 )
167 switch ( _double_parser_trans_actions[_trans] ) {
169 #line 37 "hb-number-parser.rl"
173 #line 38 "hb-number-parser.rl"
177 #line 40 "hb-number-parser.rl"
179 value = value * 10. + ((*p) - '0');
183 #line 43 "hb-number-parser.rl"
185 if (likely (frac <= MAX_FRACT / 10))
187 frac = frac * 10. + ((*p) - '0');
193 #line 50 "hb-number-parser.rl"
195 if (likely (exp * 10 + ((*p) - '0') <= MAX_EXP))
196 exp = exp * 10 + ((*p) - '0');
201 #line 202 "hb-number-parser.hh"
213 #line 113 "hb-number-parser.rl"
218 if (frac_count) value += frac / _pow10 (frac_count);
219 if (neg) value *= -1.;
221 if (unlikely (exp_overflow))
223 if (value == 0) return value;
224 if (exp_neg) return neg ? -DBL_MIN : DBL_MIN;
225 else return neg ? -DBL_MAX : DBL_MAX;
230 if (exp_neg) value /= _pow10 (exp);
231 else value *= _pow10 (exp);
237 #endif /* HB_NUMBER_PARSER_HH */