Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/unicharset/validator.cpp @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 #include "validator.h"
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3 #include <algorithm>
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4 #include <iterator>
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5 #include <unordered_map>
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6 #include <vector>
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7
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8 #include "icuerrorcode.h"
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9 #include "unicode/uchar.h" // From libicu
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10 #include "unicode/uscript.h" // From libicu
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11 #include "validate_grapheme.h"
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12 #include "validate_indic.h"
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13 #include "validate_javanese.h"
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14 #include "validate_khmer.h"
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15 #include "validate_myanmar.h"
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17 namespace tesseract {
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19 // Some specific but universally useful unicodes.
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20 const char32 Validator::kZeroWidthSpace = 0x200B;
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21 const char32 Validator::kZeroWidthNonJoiner = 0x200C;
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22 const char32 Validator::kZeroWidthJoiner = 0x200D;
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23 const char32 Validator::kLeftToRightMark = 0x200E;
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24 const char32 Validator::kRightToLeftMark = 0x200F;
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25 const char32 Validator::kInvalid = 0xfffd;
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27 // Destructor.
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28 // It is defined here, so the compiler can create a single vtable
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29 // instead of weak vtables in every compilation unit.
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30 Validator::~Validator() = default;
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32 // Validates and cleans the src vector of unicodes to the *dest, according to
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33 // g_mode. In the case of kSingleString, a single vector containing the whole
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34 // result is added to *dest. With kCombined, multiple vectors are added to
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35 // *dest with one grapheme in each. With kGlyphSplit, multiple vectors are
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36 // added to *dest with a smaller unit representing a glyph in each.
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37 // In case of validation error, returns false and as much as possible of the
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38 // input, without discarding invalid text.
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39 /* static */
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40 bool Validator::ValidateCleanAndSegment(GraphemeNormMode g_mode, bool report_errors,
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41 const std::vector<char32> &src,
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42 std::vector<std::vector<char32>> *dest) {
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43 ValidateGrapheme g_validator(ViramaScript::kNonVirama, report_errors);
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44 std::vector<std::vector<char32>> graphemes;
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45 ViramaScript script = MostFrequentViramaScript(src);
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46 bool success = true;
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47 if (script == ViramaScript::kNonVirama) {
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48 // The grapheme segmenter's maximum segmentation is the grapheme unit, so
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49 // up the mode by 1 to get the desired effect.
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50 if (g_mode == GraphemeNormMode::kCombined) {
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51 g_mode = GraphemeNormMode::kGlyphSplit;
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52 } else if (g_mode == GraphemeNormMode::kGlyphSplit) {
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53 g_mode = GraphemeNormMode::kIndividualUnicodes;
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54 }
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55 // Just do grapheme segmentation.
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56 success = g_validator.ValidateCleanAndSegmentInternal(g_mode, src, dest);
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57 } else {
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58 success =
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59 g_validator.ValidateCleanAndSegmentInternal(GraphemeNormMode::kGlyphSplit, src, &graphemes);
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60 std::unique_ptr<Validator> validator(ScriptValidator(script, report_errors));
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61 for (const auto &grapheme : graphemes) {
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62 if (!validator->ValidateCleanAndSegmentInternal(g_mode, grapheme, dest)) {
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63 success = false;
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64 }
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65 }
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66 }
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67 return success;
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68 }
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69
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70 // Factory method that understands how to map script to the right subclass.
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71 std::unique_ptr<Validator> Validator::ScriptValidator(ViramaScript script, bool report_errors) {
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72 switch (script) {
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73 #define CASE(e, T) case ViramaScript::e: return std::make_unique<T>(script, report_errors)
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74 CASE(kNonVirama, ValidateGrapheme);
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75 CASE(kJavanese, ValidateJavanese);
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76 CASE(kMyanmar, ValidateMyanmar);
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77 CASE(kKhmer, ValidateKhmer);
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78 #undef CASE
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79 default:
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80 return std::make_unique<ValidateIndic>(script, report_errors);
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81 }
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82 }
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83
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84 // Internal version of the public static ValidateCleanAndSegment.
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85 // Validates and cleans the src vector of unicodes to the *dest, according to
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86 // its type and the given g_mode.
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87 // In case of validation error, returns false and returns as much as possible
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88 // of the input, without discarding invalid text.
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89 bool Validator::ValidateCleanAndSegmentInternal(GraphemeNormMode g_mode,
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90 const std::vector<char32> &src,
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91 std::vector<std::vector<char32>> *dest) {
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92 Clear();
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93 ComputeClassCodes(src);
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94 bool success = true;
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95 for (codes_used_ = 0; codes_used_ < codes_.size();) {
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96 if (!ConsumeGraphemeIfValid()) {
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diff changeset
97 success = false;
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parents:
diff changeset
98 ++codes_used_;
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99 }
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100 }
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parents:
diff changeset
101 MoveResultsToDest(g_mode, dest);
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diff changeset
102 return success;
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103 }
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104
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105 // Moves the results from parts_ or output_ to dest according to g_mode.
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diff changeset
106 void Validator::MoveResultsToDest(GraphemeNormMode g_mode, std::vector<std::vector<char32>> *dest) {
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107 if (g_mode == GraphemeNormMode::kIndividualUnicodes) {
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108 // Append each element of the combined output_ that we made as a new vector
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109 // in dest.
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110 dest->reserve(dest->size() + output_.size());
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111 for (char32 ch : output_) {
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diff changeset
112 dest->push_back({ch});
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113 }
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114 } else if (g_mode == GraphemeNormMode::kGlyphSplit) {
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115 // Append all the parts_ that we made onto dest.
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116 std::move(parts_.begin(), parts_.end(), std::back_inserter(*dest));
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117 } else if (g_mode == GraphemeNormMode::kCombined || dest->empty()) {
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118 // Append the combined output_ that we made onto dest as one new vector.
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119 dest->push_back(std::vector<char32>());
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120 output_.swap(dest->back());
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121 } else { // kNone.
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122 // Append the combined output_ that we made onto the last existing element
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123 // of dest.
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124 dest->back().insert(dest->back().end(), output_.begin(), output_.end());
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125 }
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parents:
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126 }
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127
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128 static bool CmpPairSecond(const std::pair<int, int> &p1, const std::pair<int, int> &p2) {
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129 return p1.second < p2.second;
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130 }
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131
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132 // Computes and returns the ViramaScript corresponding to the most frequent
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parents:
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133 // virama-using script in the input, or kNonVirama if none are present.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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134 /* static */
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parents:
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135 ViramaScript Validator::MostFrequentViramaScript(const std::vector<char32> &utf32) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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136 std::unordered_map<int, int> histogram;
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parents:
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137 for (char32 ch : utf32) {
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parents:
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138 // Determine the codepage base. For the Indic scripts, Khmer and Javanese,
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139 // it is sufficient to divide by kIndicCodePageSize but Myanmar is all over
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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140 // the unicode code space, so use its script id.
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parents:
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141 int base = ch / kIndicCodePageSize;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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142 IcuErrorCode err;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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143 UScriptCode script_code = uscript_getScript(ch, err);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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144 if ((kMinIndicUnicode <= ch && ch <= kMaxJavaneseUnicode && script_code != USCRIPT_COMMON) ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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145 script_code == USCRIPT_MYANMAR) {
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parents:
diff changeset
146 if (script_code == USCRIPT_MYANMAR) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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147 base = static_cast<char32>(ViramaScript::kMyanmar) / kIndicCodePageSize;
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148 }
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parents:
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149 ++histogram[base];
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150 }
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parents:
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151 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 if (!histogram.empty()) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 int base = std::max_element(histogram.begin(), histogram.end(), CmpPairSecond)->first;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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154 auto codebase = static_cast<char32>(base * kIndicCodePageSize);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 // Check for validity.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 if (codebase == static_cast<char32>(ViramaScript::kMyanmar) ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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157 codebase == static_cast<char32>(ViramaScript::kJavanese) ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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158 codebase == static_cast<char32>(ViramaScript::kKhmer) ||
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parents:
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159 (static_cast<char32>(ViramaScript::kDevanagari) <= codebase &&
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 codebase <= static_cast<char32>(ViramaScript::kSinhala))) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 return static_cast<ViramaScript>(codebase);
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162 }
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163 }
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parents:
diff changeset
164 return ViramaScript::kNonVirama;
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165 }
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166
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parents:
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167 // Returns true if the given UTF-32 unicode is a "virama" character.
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parents:
diff changeset
168 /* static */
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parents:
diff changeset
169 bool Validator::IsVirama(char32 unicode) {
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parents:
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170 return (kMinIndicUnicode <= unicode && unicode <= kMaxSinhalaUnicode &&
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diff changeset
171 (unicode & 0x7f) == 0x4d) ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 unicode == kSinhalaVirama || unicode == kJavaneseVirama || unicode == kMyanmarVirama ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 unicode == kKhmerVirama;
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174 }
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175
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parents:
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176 // Returns true if the given UTF-32 unicode is a vedic accent.
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parents:
diff changeset
177 /* static */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 bool Validator::IsVedicAccent(char32 unicode) {
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
179 return (0x1cd0 <= unicode && unicode < 0x1d00) || (0xa8e0 <= unicode && unicode <= 0xa8f7) ||
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parents:
diff changeset
180 (0x951 <= unicode && unicode <= 0x954);
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181 }
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182
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parents:
diff changeset
183 // Returns true if the script is one that uses subscripts for conjuncts.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 bool Validator::IsSubscriptScript() const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 return script_ == ViramaScript::kTelugu || script_ == ViramaScript::kKannada ||
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parents:
diff changeset
186 script_ == ViramaScript::kJavanese || script_ == ViramaScript::kMyanmar ||
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 script_ == ViramaScript::kKhmer;
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parents:
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188 }
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parents:
diff changeset
189
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 void Validator::ComputeClassCodes(const std::vector<char32> &text) {
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
191 codes_.reserve(text.size());
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 for (char32 c : text) {
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 codes_.emplace_back(UnicodeToCharClass(c), c);
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194 }
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195 }
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196
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197 // Resets to the initial state.
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198 void Validator::Clear() {
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199 codes_.clear();
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200 parts_.clear();
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201 output_.clear();
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202 codes_used_ = 0;
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203 output_used_ = 0;
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204 }
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205
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206 } // namespace tesseract