Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/ambigs.h @ 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 // File: ambigs.h
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3 // Description: Constants, flags, functions for dealing with
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4 // ambiguities (training and recognition).
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5 // Author: Daria Antonova
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6 //
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7 // (C) Copyright 2008, Google Inc.
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8 // Licensed under the Apache License, Version 2.0 (the "License");
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9 // you may not use this file except in compliance with the License.
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10 // You may obtain a copy of the License at
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11 // http://www.apache.org/licenses/LICENSE-2.0
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 //
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18 ///////////////////////////////////////////////////////////////////////
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19
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20 #ifndef TESSERACT_CCUTIL_AMBIGS_H_
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21 #define TESSERACT_CCUTIL_AMBIGS_H_
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23 #ifdef HAVE_CONFIG_H
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24 # include "config_auto.h" // DISABLED_LEGACY_ENGINE
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25 #endif
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27 #if !defined(DISABLED_LEGACY_ENGINE)
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29 # include <tesseract/unichar.h>
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30 # include "elst.h"
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31 # include "tprintf.h"
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32 # include "unicharset.h"
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34 # define MAX_AMBIG_SIZE 10
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36 namespace tesseract {
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37
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38 using UnicharIdVector = std::vector<UNICHAR_ID>;
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39
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40 enum AmbigType {
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41 NOT_AMBIG, // the ngram pair is not ambiguous
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42 REPLACE_AMBIG, // ocred ngram should always be substituted with correct
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43 DEFINITE_AMBIG, // add correct ngram to the classifier results (1-1)
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44 SIMILAR_AMBIG, // use pairwise classifier for ocred/correct pair (1-1)
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45 CASE_AMBIG, // this is a case ambiguity (1-1)
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47 AMBIG_TYPE_COUNT // number of enum entries
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48 };
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49
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50 // A collection of utility functions for arrays of UNICHAR_IDs that are
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51 // terminated by INVALID_UNICHAR_ID.
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52 class UnicharIdArrayUtils {
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53 public:
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54 // Compares two arrays of unichar ids. Returns -1 if the length of array1 is
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55 // less than length of array2, if any array1[i] is less than array2[i].
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56 // Returns 0 if the arrays are equal, 1 otherwise.
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57 // The function assumes that the arrays are terminated by INVALID_UNICHAR_ID.
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58 static inline int compare(const UNICHAR_ID *ptr1, const UNICHAR_ID *ptr2) {
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59 for (;;) {
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60 const UNICHAR_ID val1 = *ptr1++;
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61 const UNICHAR_ID val2 = *ptr2++;
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62 if (val1 != val2) {
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63 if (val1 == INVALID_UNICHAR_ID) {
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64 return -1;
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65 }
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66 if (val2 == INVALID_UNICHAR_ID) {
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67 return 1;
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68 }
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69 if (val1 < val2) {
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70 return -1;
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71 }
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72 return 1;
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73 }
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74 if (val1 == INVALID_UNICHAR_ID) {
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75 return 0;
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76 }
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77 }
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78 }
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79
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80 // Copies UNICHAR_IDs from dst to src. Returns the number of ids copied.
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81 // The function assumes that the arrays are terminated by INVALID_UNICHAR_ID
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82 // and that dst has enough space for all the elements from src.
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83 static inline int copy(const UNICHAR_ID src[], UNICHAR_ID dst[]) {
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84 int i = 0;
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85 do {
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86 dst[i] = src[i];
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87 } while (dst[i++] != INVALID_UNICHAR_ID);
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88 return i - 1;
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89 }
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90
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91 // Prints unichars corresponding to the unichar_ids in the given array.
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92 // The function assumes that array is terminated by INVALID_UNICHAR_ID.
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93 static inline void print(const UNICHAR_ID array[], const UNICHARSET &unicharset) {
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94 const UNICHAR_ID *ptr = array;
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95 if (*ptr == INVALID_UNICHAR_ID) {
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96 tprintf("[Empty]");
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97 }
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98 while (*ptr != INVALID_UNICHAR_ID) {
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99 tprintf("%s ", unicharset.id_to_unichar(*ptr++));
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100 }
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101 tprintf("( ");
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102 ptr = array;
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103 while (*ptr != INVALID_UNICHAR_ID) {
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104 tprintf("%d ", *ptr++);
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105 }
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106 tprintf(")\n");
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107 }
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108 };
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109
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110 // AMBIG_SPEC_LIST stores a list of dangerous ambigs that
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111 // start with the same unichar (e.g. r->t rn->m rr1->m).
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112 class AmbigSpec : public ELIST_LINK {
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113 public:
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114 AmbigSpec();
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115 ~AmbigSpec() = default;
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116
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117 // Comparator function for sorting AmbigSpec_LISTs. The lists will
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118 // be sorted by their wrong_ngram arrays. Example of wrong_ngram vectors
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119 // in a sorted AmbigSpec_LIST: [9 1 3], [9 3 4], [9 8], [9, 8 1].
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120 static int compare_ambig_specs(const void *spec1, const void *spec2) {
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121 const AmbigSpec *s1 = *static_cast<const AmbigSpec *const *>(spec1);
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122 const AmbigSpec *s2 = *static_cast<const AmbigSpec *const *>(spec2);
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123 int result = UnicharIdArrayUtils::compare(s1->wrong_ngram, s2->wrong_ngram);
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124 if (result != 0) {
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125 return result;
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126 }
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127 return UnicharIdArrayUtils::compare(s1->correct_fragments, s2->correct_fragments);
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128 }
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129
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130 UNICHAR_ID wrong_ngram[MAX_AMBIG_SIZE + 1];
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131 UNICHAR_ID correct_fragments[MAX_AMBIG_SIZE + 1];
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132 UNICHAR_ID correct_ngram_id;
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133 AmbigType type;
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134 int wrong_ngram_size;
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135 };
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136 ELISTIZEH(AmbigSpec)
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137
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138 // AMBIG_TABLE[i] stores a set of ambiguities whose
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139 // wrong ngram starts with unichar id i.
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140 using UnicharAmbigsVector = std::vector<AmbigSpec_LIST *>;
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141
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142 class UnicharAmbigs {
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143 public:
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144 UnicharAmbigs() = default;
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145 ~UnicharAmbigs() {
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146 for (auto data : replace_ambigs_) {
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147 delete data;
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148 }
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149 for (auto data : dang_ambigs_) {
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150 delete data;
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151 }
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152 for (auto data : one_to_one_definite_ambigs_) {
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153 delete data;
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154 }
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155 }
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156
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157 const UnicharAmbigsVector &dang_ambigs() const {
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158 return dang_ambigs_;
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159 }
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160 const UnicharAmbigsVector &replace_ambigs() const {
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161 return replace_ambigs_;
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162 }
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163
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164 // Initializes the ambigs by adding a nullptr pointer to each table.
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165 void InitUnicharAmbigs(const UNICHARSET &unicharset, bool use_ambigs_for_adaption);
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166
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167 // Loads the universal ambigs that are useful for any language.
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168 void LoadUniversal(const UNICHARSET &encoder_set, UNICHARSET *unicharset);
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169
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170 // Fills in two ambiguity tables (replaceable and dangerous) with information
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171 // read from the ambigs file. An ambiguity table is an array of lists.
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172 // The array is indexed by a class id. Each entry in the table provides
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173 // a list of potential ambiguities which can start with the corresponding
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174 // character. For example the ambiguity "rn -> m", would be located in the
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175 // table at index of unicharset.unichar_to_id('r').
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176 // In 1-1 ambiguities (e.g. s -> S, 1 -> I) are recorded in
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177 // one_to_one_definite_ambigs_. This vector is also indexed by the class id
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178 // of the wrong part of the ambiguity and each entry contains a vector of
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179 // unichar ids that are ambiguous to it.
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180 // encoder_set is used to encode the ambiguity strings, undisturbed by new
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181 // unichar_ids that may be created by adding the ambigs.
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182 void LoadUnicharAmbigs(const UNICHARSET &encoder_set, TFile *ambigs_file, int debug_level,
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183 bool use_ambigs_for_adaption, UNICHARSET *unicharset);
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184
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185 // Returns definite 1-1 ambigs for the given unichar id.
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186 inline const UnicharIdVector *OneToOneDefiniteAmbigs(UNICHAR_ID unichar_id) const {
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187 if (one_to_one_definite_ambigs_.empty()) {
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188 return nullptr;
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189 }
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190 return one_to_one_definite_ambigs_[unichar_id];
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191 }
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192
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193 // Returns a pointer to the vector with all unichar ids that appear in the
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194 // 'correct' part of the ambiguity pair when the given unichar id appears
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195 // in the 'wrong' part of the ambiguity. E.g. if DangAmbigs file consist of
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196 // m->rn,rn->m,m->iii, UnicharAmbigsForAdaption() called with unichar id of
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197 // m will return a pointer to a vector with unichar ids of r,n,i.
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198 inline const UnicharIdVector *AmbigsForAdaption(UNICHAR_ID unichar_id) const {
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199 if (ambigs_for_adaption_.empty()) {
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200 return nullptr;
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201 }
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202 return ambigs_for_adaption_[unichar_id];
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203 }
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204
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205 // Similar to the above, but return the vector of unichar ids for which
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206 // the given unichar_id is an ambiguity (appears in the 'wrong' part of
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207 // some ambiguity pair).
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208 inline const UnicharIdVector *ReverseAmbigsForAdaption(UNICHAR_ID unichar_id) const {
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209 if (reverse_ambigs_for_adaption_.empty()) {
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210 return nullptr;
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211 }
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212 return reverse_ambigs_for_adaption_[unichar_id];
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213 }
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214
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215 private:
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216 bool ParseAmbiguityLine(int line_num, int version, int debug_level, const UNICHARSET &unicharset,
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217 char *buffer, int *test_ambig_part_size, UNICHAR_ID *test_unichar_ids,
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218 int *replacement_ambig_part_size, char *replacement_string, int *type);
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219 bool InsertIntoTable(UnicharAmbigsVector &table, int test_ambig_part_size,
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220 UNICHAR_ID *test_unichar_ids, int replacement_ambig_part_size,
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221 const char *replacement_string, int type, AmbigSpec *ambig_spec,
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222 UNICHARSET *unicharset);
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223
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224 UnicharAmbigsVector dang_ambigs_;
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225 UnicharAmbigsVector replace_ambigs_;
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226 std::vector<UnicharIdVector *> one_to_one_definite_ambigs_;
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227 std::vector<UnicharIdVector *> ambigs_for_adaption_;
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228 std::vector<UnicharIdVector *> reverse_ambigs_for_adaption_;
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229 };
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230
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231 } // namespace tesseract
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232
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233 #endif // !defined(DISABLED_LEGACY_ENGINE)
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234
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235 #endif // TESSERACT_CCUTIL_AMBIGS_H_