Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/unicharset/validate_grapheme.cpp @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +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_grapheme.h"
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2 #include "tprintf.h"
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3 #include "unicode/uchar.h" // From libicu
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4
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5 namespace tesseract {
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6
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7 bool ValidateGrapheme::ConsumeGraphemeIfValid() {
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8 const unsigned num_codes = codes_.size();
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9 char32 prev_prev_ch = ' ';
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10 char32 prev_ch = ' ';
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11 CharClass prev_cc = CharClass::kWhitespace;
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12 int num_codes_in_grapheme = 0;
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13 while (codes_used_ < num_codes) {
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14 CharClass cc = codes_[codes_used_].first;
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15 char32 ch = codes_[codes_used_].second;
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16 const bool is_combiner = cc == CharClass::kCombiner || cc == CharClass::kVirama;
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17 // TODO: Make this code work well with RTL text.
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18 // See
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19 // https://github.com/tesseract-ocr/tesseract/pull/2266#issuecomment-467114751
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20 #if 0
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21 // Reject easily detected badly formed sequences.
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22 if (prev_cc == CharClass::kWhitespace && is_combiner) {
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23 if (report_errors_) tprintf("Word started with a combiner:0x%x\n", ch);
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24 return false;
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25 }
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26 #endif
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27 if (prev_cc == CharClass::kVirama && cc == CharClass::kVirama) {
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28 if (report_errors_) {
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29 tprintf("Two grapheme links in a row:0x%x 0x%x\n", prev_ch, ch);
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30 }
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31 return false;
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32 }
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33 if (prev_cc != CharClass::kWhitespace && cc != CharClass::kWhitespace &&
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34 IsBadlyFormed(prev_ch, ch)) {
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35 return false;
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36 }
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37 bool prev_is_fwd_combiner = prev_ch == kZeroWidthJoiner || prev_cc == CharClass::kVirama ||
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38 (prev_ch == kZeroWidthNonJoiner &&
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39 (cc == CharClass::kVirama || prev_prev_ch == kZeroWidthJoiner));
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40 if (num_codes_in_grapheme > 0 && !is_combiner && !prev_is_fwd_combiner) {
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41 break;
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42 }
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43 CodeOnlyToOutput();
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44 ++num_codes_in_grapheme;
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45 prev_prev_ch = prev_ch;
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46 prev_ch = ch;
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47 prev_cc = cc;
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48 }
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49 if (num_codes_in_grapheme > 0) {
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50 MultiCodePart(num_codes_in_grapheme);
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51 }
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52 return true;
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53 }
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54
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55 Validator::CharClass ValidateGrapheme::UnicodeToCharClass(char32 ch) const {
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56 if (IsVedicAccent(ch)) {
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57 return CharClass::kVedicMark;
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58 }
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59 // The ZeroWidth[Non]Joiner characters are mapped to kCombiner as they
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60 // always combine with the previous character.
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61 if (u_hasBinaryProperty(ch, UCHAR_GRAPHEME_LINK)) {
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62 return CharClass::kVirama;
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63 }
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64 if (u_isUWhiteSpace(ch)) {
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65 return CharClass::kWhitespace;
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66 }
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67 // Workaround for Javanese Aksara's Taling, do not label it as a combiner
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68 if (ch == 0xa9ba) {
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69 return CharClass::kConsonant;
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70 }
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71 int char_type = u_charType(ch);
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72 if (char_type == U_NON_SPACING_MARK || char_type == U_ENCLOSING_MARK ||
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73 char_type == U_COMBINING_SPACING_MARK || ch == kZeroWidthNonJoiner ||
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74 ch == kZeroWidthJoiner) {
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75 return CharClass::kCombiner;
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76 }
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77 return CharClass::kOther;
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78 }
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79
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80 // Helper returns true if the sequence prev_ch,ch is invalid.
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81 bool ValidateGrapheme::IsBadlyFormed(char32 prev_ch, char32 ch) {
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82 // Reject badly formed Indic vowels.
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83 if (IsBadlyFormedIndicVowel(prev_ch, ch)) {
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84 if (report_errors_) {
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85 tprintf("Badly formed Indic vowel sequence:0x%x 0x%x\n", prev_ch, ch);
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86 }
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87 return true;
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88 }
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89 if (IsBadlyFormedThai(prev_ch, ch)) {
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90 if (report_errors_) {
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91 tprintf("Badly formed Thai:0x%x 0x%x\n", prev_ch, ch);
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92 }
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93 return true;
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94 }
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95 return false;
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96 }
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97
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98 // Helper returns true if the sequence prev_ch,ch is an invalid Indic vowel.
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99 // Some vowels in Indic scripts may be analytically decomposed into atomic pairs
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100 // of components that are themselves valid unicode symbols. (See Table 12-1 in
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101 // http://www.unicode.org/versions/Unicode9.0.0/ch12.pdf
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102 // for examples in Devanagari). The Unicode standard discourages specifying
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103 // vowels this way, but they are sometimes encountered in text, probably because
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104 // some editors still permit it. Renderers however dislike such pairs, and so
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105 // this function may be used to detect their occurrence for removal.
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106 // TODO(rays) This function only covers a subset of Indic languages and doesn't
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107 // include all rules. Add rules as appropriate to support other languages or
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108 // find a way to generalize these existing rules that makes use of the
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109 // regularity of the mapping from ISCII to Unicode.
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110 /* static */
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111 bool ValidateGrapheme::IsBadlyFormedIndicVowel(char32 prev_ch, char32 ch) {
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112 return ((prev_ch == 0x905 && (ch == 0x946 || ch == 0x93E)) || (prev_ch == 0x909 && ch == 0x941) ||
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113 (prev_ch == 0x90F && (ch >= 0x945 && ch <= 0x947)) ||
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114 (prev_ch == 0x905 && (ch >= 0x949 && ch <= 0x94C)) ||
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115 (prev_ch == 0x906 && (ch >= 0x949 && ch <= 0x94C)) ||
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Franz Glasner <fzglas.hg@dom66.de>
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116 // Illegal combinations of two dependent Devanagari vowels.
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117 (prev_ch == 0x93E && (ch >= 0x945 && ch <= 0x948)) ||
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118 // Dependent Devanagari vowels following a virama.
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119 (prev_ch == 0x94D && (ch >= 0x93E && ch <= 0x94C)) ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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120 // Bengali vowels (Table 9-5, pg 313)
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121 (prev_ch == 0x985 && ch == 0x9BE) ||
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Franz Glasner <fzglas.hg@dom66.de>
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122 // Telugu vowels (Table 9-19, pg 331)
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Franz Glasner <fzglas.hg@dom66.de>
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123 (prev_ch == 0xC12 && (ch == 0xC55 || ch == 0xC4C)) ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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124 // Kannada vowels (Table 9-20, pg 332)
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125 (prev_ch == 0xC92 && ch == 0xCCC));
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126 }
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127
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128 // Helper returns true if ch is a Thai consonant.
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parents:
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129 static bool IsThaiConsonant(char32 ch) {
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130 return 0xe01 <= ch && ch <= 0xe2e;
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131 }
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132
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parents:
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133 // Helper returns true is ch is a before-consonant vowel.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 static bool IsThaiBeforeConsonantVowel(char32 ch) {
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Franz Glasner <fzglas.hg@dom66.de>
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135 return 0xe40 <= ch && ch <= 0xe44;
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136 }
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137
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138 // Helper returns true if ch is a Thai tone mark.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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139 static bool IsThaiToneMark(char32 ch) {
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parents:
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140 return 0xe48 <= ch && ch <= 0xe4b;
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141 }
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142
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143 // Helper returns true if ch is a Thai vowel that may be followed by a tone
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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144 // mark.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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145 static bool IsThaiTonableVowel(char32 ch) {
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parents:
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146 return (0xe34 <= ch && ch <= 0xe39) || ch == 0xe31;
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147 }
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148
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parents:
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149 // Helper returns true if the sequence prev_ch,ch is invalid Thai.
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150 // These rules come from a native Thai speaker, and are not covered by the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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151 // Thai section in the unicode book:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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152 // http://www.unicode.org/versions/Unicode9.0.0/ch16.pdf
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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153 // Comments below added by Ray interpreting the code ranges.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 /* static */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 bool ValidateGrapheme::IsBadlyFormedThai(char32 prev_ch, char32 ch) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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156 // Tone marks must follow consonants or specific vowels.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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157 if (IsThaiToneMark(ch) && !(IsThaiConsonant(prev_ch) || IsThaiTonableVowel(prev_ch))) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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158 return true;
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parents:
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159 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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160 // Tonable vowels must follow consonants.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 if ((IsThaiTonableVowel(ch) || ch == 0xe47) && !IsThaiConsonant(prev_ch)) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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162 return true;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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163 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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164 // Thanthakhat must follow consonant or specific vowels.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 if (ch == 0xe4c && !(IsThaiConsonant(prev_ch) || prev_ch == 0xe38 || prev_ch == 0xe34)) {
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parents:
diff changeset
166 return true;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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167 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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168 // Nikkhahit must follow a consonant ?or certain markers?.
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parents:
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169 // TODO(rays) confirm this, but there were so many in the ground truth of the
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parents:
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170 // validation set that it seems reasonable to assume it is valid.
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parents:
diff changeset
171 if (ch == 0xe4d && !(IsThaiConsonant(prev_ch) || prev_ch == 0xe48 || prev_ch == 0xe49)) {
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parents:
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172 return true;
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parents:
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173 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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174 // The vowels e30, e32, e33 can be used more liberally.
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parents:
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175 if ((ch == 0xe30 || ch == 0xe32 || ch == 0xe33) &&
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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176 !(IsThaiConsonant(prev_ch) || IsThaiToneMark(prev_ch)) &&
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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177 !(prev_ch == 0xe32 && ch == 0xe30) && !(prev_ch == 0xe4d && ch == 0xe32)) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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178 return true;
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179 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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180 // Some vowels come before consonants, and therefore cannot follow things
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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181 // that cannot end a syllable.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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182 if (IsThaiBeforeConsonantVowel(ch) &&
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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183 (IsThaiBeforeConsonantVowel(prev_ch) || prev_ch == 0xe31 || prev_ch == 0xe37)) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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184 return true;
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185 }
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parents:
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186 // Don't allow the standalone vowel U+0e24 to be followed by other vowels.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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187 if ((0xe30 <= ch && ch <= 0xe4D) && prev_ch == 0xe24) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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188 return true;
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parents:
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189 }
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parents:
diff changeset
190 return false;
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parents:
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191 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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192
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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193 } // namespace tesseract