Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/unicharset/validate_khmer.cpp @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 #include "validate_khmer.h"
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2 #include "errcode.h"
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3 #include "tprintf.h"
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4
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5 namespace tesseract {
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6
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7 // Returns whether codes matches the pattern for a Khmer Grapheme.
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8 // Taken from unicode standard:
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9 // http://www.unicode.org/versions/Unicode9.0.0/ch16.pdf.
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10 // where it gives: B {R | C} {S {R}}* {{Z} V} {O} {S}, using different notation
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11 // to the ISCII standard http://varamozhi.sourceforge.net/iscii91.pdf.
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12 // Translated to the codes used by the CharClass enum:
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13 // C {R | N} {HC {R}}* {{Z|z} M{P}} {D} {HC}
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14 // Where R is a new symbol (Robat) and N is repurposed as a consonant shifter.
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15 // Also the Consonant class here includes independent vowels, as they are
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16 // treated the same anyway.
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17 // In the split grapheme mode, the only characters that get grouped are the
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18 // HC and the {Z|z}M The unicode chapter on Khmer only mentions the joiners in
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19 // the BNF syntax, so who knows what they do.
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20 bool ValidateKhmer::ConsumeGraphemeIfValid() {
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21 const unsigned num_codes = codes_.size();
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22 if (codes_used_ == num_codes) {
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23 return false;
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24 }
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25 if (codes_[codes_used_].first == CharClass::kOther) {
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26 UseMultiCode(1);
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27 return true;
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28 }
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29 if (codes_[codes_used_].first != CharClass::kConsonant) {
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30 if (report_errors_) {
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31 tprintf("Invalid start of Khmer syllable:0x%x\n", codes_[codes_used_].second);
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32 }
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33 return false;
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34 }
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35 if (UseMultiCode(1)) {
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36 return true;
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37 }
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38 if (codes_[codes_used_].first == CharClass::kRobat ||
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39 codes_[codes_used_].first == CharClass::kNukta) {
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40 if (UseMultiCode(1)) {
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41 return true;
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42 }
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43 }
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44 while (codes_used_ + 1 < num_codes && codes_[codes_used_].first == CharClass::kVirama &&
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45 codes_[codes_used_ + 1].first == CharClass::kConsonant) {
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46 ASSERT_HOST(!CodeOnlyToOutput());
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47 if (UseMultiCode(2)) {
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48 return true;
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49 }
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50 if (codes_[codes_used_].first == CharClass::kRobat) {
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51 if (UseMultiCode(1)) {
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52 return true;
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53 }
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54 }
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55 }
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56 unsigned num_matra_parts = 0;
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57 if (codes_[codes_used_].second == kZeroWidthJoiner ||
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58 codes_[codes_used_].second == kZeroWidthNonJoiner) {
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59 if (CodeOnlyToOutput()) {
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60 if (report_errors_) {
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61 tprintf("Unterminated joiner: 0x%x\n", output_.back());
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62 }
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63 return false;
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64 }
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65 ++num_matra_parts;
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66 }
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67 // Not quite as shown by the BNF, the matra piece is allowed as a matra on its
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68 // own or as an addition to other matras.
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69 if (codes_[codes_used_].first == CharClass::kMatra ||
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70 codes_[codes_used_].first == CharClass::kMatraPiece) {
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71 ++num_matra_parts;
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72 if (UseMultiCode(num_matra_parts)) {
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73 return true;
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74 }
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75 } else if (num_matra_parts) {
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76 if (report_errors_) {
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77 tprintf("Joiner with non-dependent vowel after it!:0x%x 0x%x\n", output_.back(),
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78 codes_[codes_used_].second);
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79 }
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80 return false;
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81 }
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82 if (codes_[codes_used_].first == CharClass::kMatraPiece &&
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83 codes_[codes_used_ - 1].first != CharClass::kMatraPiece) {
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84 if (UseMultiCode(1)) {
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85 return true;
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86 }
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87 }
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88 if (codes_[codes_used_].first == CharClass::kVowelModifier) {
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89 if (UseMultiCode(1)) {
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90 return true;
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91 }
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92 }
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93 if (codes_used_ + 1 < num_codes && codes_[codes_used_].first == CharClass::kVirama &&
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94 codes_[codes_used_ + 1].first == CharClass::kConsonant) {
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95 ASSERT_HOST(!CodeOnlyToOutput());
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96 if (UseMultiCode(2)) {
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97 return true;
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98 }
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99 }
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100 return true;
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101 }
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102
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103 Validator::CharClass ValidateKhmer::UnicodeToCharClass(char32 ch) const {
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104 if (IsVedicAccent(ch)) {
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105 return CharClass::kVedicMark;
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106 }
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107 if (ch == kZeroWidthNonJoiner) {
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108 return CharClass::kZeroWidthNonJoiner;
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109 }
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110 if (ch == kZeroWidthJoiner) {
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111 return CharClass::kZeroWidthJoiner;
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112 }
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113 // Offset from the start of the relevant unicode code block aka code page.
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114 int off = ch - static_cast<char32>(script_);
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115 // Anything in another code block is other.
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116 if (off < 0 || off >= kIndicCodePageSize) {
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117 return CharClass::kOther;
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118 }
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119 if (off <= 0x33) {
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120 return CharClass::kConsonant;
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121 }
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122 if (off <= 0x45) {
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123 return CharClass::kMatra;
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124 }
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125 if (off == 0x46) {
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126 return CharClass::kMatraPiece;
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127 }
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128 if (off == 0x4c) {
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129 return CharClass::kRobat;
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130 }
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131 if (off == 0x49 || off == 0x4a) {
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132 return CharClass::kNukta;
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133 }
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134 if (off <= 0x51) {
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135 return CharClass::kVowelModifier;
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136 }
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137 if (off == 0x52) {
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138 return CharClass::kVirama;
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139 }
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140 return CharClass::kOther;
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141 }
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142
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143 } // namespace tesseract