Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-shaper-khmer-machine.rl @ 46:7ee69f120f19 default tip

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 /*
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2 * Copyright © 2011,2012 Google, Inc.
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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 * Google Author(s): Behdad Esfahbod
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25 */
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26
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27 #ifndef HB_OT_SHAPER_KHMER_MACHINE_HH
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28 #define HB_OT_SHAPER_KHMER_MACHINE_HH
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30 #include "hb.hh"
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32 #include "hb-ot-layout.hh"
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33 #include "hb-ot-shaper-indic.hh"
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35 /* buffer var allocations */
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36 #define khmer_category() ot_shaper_var_u8_category() /* khmer_category_t */
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38 using khmer_category_t = unsigned;
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39
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40 #define K_Cat(Cat) khmer_syllable_machine_ex_##Cat
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42 enum khmer_syllable_type_t {
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43 khmer_consonant_syllable,
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44 khmer_broken_cluster,
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45 khmer_non_khmer_cluster,
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46 };
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47
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48 %%{
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49 machine khmer_syllable_machine;
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50 alphtype unsigned char;
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51 write exports;
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52 write data;
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53 }%%
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54
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55 %%{
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56
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57
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58 # We use category H for spec category Coeng
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59
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60 export C = 1;
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61 export V = 2;
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62 export H = 4;
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63 export ZWNJ = 5;
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64 export ZWJ = 6;
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65 export PLACEHOLDER = 10;
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66 export DOTTEDCIRCLE = 11;
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67 export Ra = 15;
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68
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69 export VAbv = 20;
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70 export VBlw = 21;
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71 export VPre = 22;
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72 export VPst = 23;
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73
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74 export Robatic = 25;
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75 export Xgroup = 26;
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76 export Ygroup = 27;
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77
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78
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79 c = (C | Ra | V);
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80 cn = c.((ZWJ|ZWNJ)?.Robatic)?;
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81 joiner = (ZWJ | ZWNJ);
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82 xgroup = (joiner*.Xgroup)*;
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83 ygroup = Ygroup*;
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84
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85 # This grammar was experimentally extracted from what Uniscribe allows.
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86
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87 matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
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88 syllable_tail = xgroup matra_group xgroup (H.c)? ygroup;
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89
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90
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91 broken_cluster = Robatic? (H.cn)* (H | syllable_tail);
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92 consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
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93 other = any;
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94
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95 main := |*
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96 consonant_syllable => { found_syllable (khmer_consonant_syllable); };
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97 broken_cluster => { found_syllable (khmer_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
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98 other => { found_syllable (khmer_non_khmer_cluster); };
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99 *|;
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100
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101
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102 }%%
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103
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104 #define found_syllable(syllable_type) \
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105 HB_STMT_START { \
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106 if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
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107 for (unsigned int i = ts; i < te; i++) \
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108 info[i].syllable() = (syllable_serial << 4) | syllable_type; \
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109 syllable_serial++; \
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110 if (syllable_serial == 16) syllable_serial = 1; \
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111 } HB_STMT_END
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112
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113 inline void
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114 find_syllables_khmer (hb_buffer_t *buffer)
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115 {
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116 unsigned int p, pe, eof, ts, te, act HB_UNUSED;
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117 int cs;
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118 hb_glyph_info_t *info = buffer->info;
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119 %%{
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120 write init;
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121 getkey info[p].khmer_category();
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122 }%%
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123
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124 p = 0;
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125 pe = eof = buffer->len;
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126
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127 unsigned int syllable_serial = 1;
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128 %%{
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129 write exec;
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130 }%%
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131 }
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132
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133 #undef found_syllable
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134
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135 #endif /* HB_OT_SHAPER_KHMER_MACHINE_HH */