Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-number-parser.rl @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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2
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1 /*
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2 * Copyright © 2019 Ebrahim Byagowi
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3 *
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4 * This is part of HarfBuzz, a text shaping library.
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5 *
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6 * Permission is hereby granted, without written agreement and without
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7 * license or royalty fees, to use, copy, modify, and distribute this
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8 * software and its documentation for any purpose, provided that the
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9 * above copyright notice and the following two paragraphs appear in
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10 * all copies of this software.
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11 *
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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16 * DAMAGE.
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17 *
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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23 *
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24 */
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25
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26 #ifndef HB_NUMBER_PARSER_HH
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27 #define HB_NUMBER_PARSER_HH
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28
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29 #include "hb.hh"
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30
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31 %%{
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32
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33 machine double_parser;
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34 alphtype unsigned char;
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35 write data;
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36
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37 action see_neg { neg = true; }
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38 action see_exp_neg { exp_neg = true; }
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39
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40 action add_int {
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41 value = value * 10. + (fc - '0');
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42 }
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43 action add_frac {
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44 if (likely (frac <= MAX_FRACT / 10))
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45 {
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46 frac = frac * 10. + (fc - '0');
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47 ++frac_count;
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48 }
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49 }
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50 action add_exp {
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51 if (likely (exp * 10 + (fc - '0') <= MAX_EXP))
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52 exp = exp * 10 + (fc - '0');
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53 else
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54 exp_overflow = true;
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55 }
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56
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57 num = [0-9]+;
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58
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59 main := (
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60 (
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61 (('+'|'-'@see_neg)? num @add_int) ('.' num @add_frac)?
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62 |
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63 (('+'|'-'@see_neg)? '.' num @add_frac)
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64 )
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65 (('e'|'E') (('+'|'-'@see_exp_neg)? num @add_exp))?
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66 );
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67
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68 }%%
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69
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70 /* Works only for n < 512 */
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71 static inline double
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72 _pow10 (unsigned exponent)
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73 {
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74 static const double _powers_of_10[] =
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75 {
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76 1.0e+256,
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77 1.0e+128,
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78 1.0e+64,
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79 1.0e+32,
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80 1.0e+16,
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81 1.0e+8,
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82 10000.,
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83 100.,
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84 10.
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85 };
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86 unsigned mask = 1 << (ARRAY_LENGTH (_powers_of_10) - 1);
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87 double result = 1;
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88 for (const double *power = _powers_of_10; mask; ++power, mask >>= 1)
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89 if (exponent & mask) result *= *power;
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90 return result;
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91 }
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92
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93 /* a variant of strtod that also gets end of buffer in its second argument */
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94 static inline double
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95 strtod_rl (const char *p, const char **end_ptr /* IN/OUT */)
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96 {
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97 double value = 0;
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98 double frac = 0;
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99 double frac_count = 0;
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100 unsigned exp = 0;
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101 bool neg = false, exp_neg = false, exp_overflow = false;
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102 const unsigned long long MAX_FRACT = 0xFFFFFFFFFFFFFull; /* 2^52-1 */
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103 const unsigned MAX_EXP = 0x7FFu; /* 2^11-1 */
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104
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105 const char *pe = *end_ptr;
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106 while (p < pe && ISSPACE (*p))
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107 p++;
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108
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109 int cs;
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110 %%{
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111 write init;
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112 write exec;
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113 }%%
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114
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115 *end_ptr = p;
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116
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117 if (frac_count) value += frac / _pow10 (frac_count);
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118 if (neg) value *= -1.;
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119
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120 if (unlikely (exp_overflow))
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121 {
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122 if (value == 0) return value;
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123 if (exp_neg) return neg ? -DBL_MIN : DBL_MIN;
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124 else return neg ? -DBL_MAX : DBL_MAX;
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125 }
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126
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127 if (exp)
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128 {
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129 if (exp_neg) value /= _pow10 (exp);
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130 else value *= _pow10 (exp);
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131 }
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132
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133 return value;
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134 }
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135
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136 #endif /* HB_NUMBER_PARSER_HH */