Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/unicharcompress.h @ 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 ///////////////////////////////////////////////////////////////////////
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2 // File: unicharcompress.h
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3 // Description: Unicode re-encoding using a sequence of smaller numbers in
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4 // place of a single large code for CJK, similarly for Indic,
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5 // and dissection of ligatures for other scripts.
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6 // Author: Ray Smith
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7 //
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8 // (C) Copyright 2015, Google Inc.
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9 // Licensed under the Apache License, Version 2.0 (the "License");
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10 // you may not use this file except in compliance with the License.
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11 // You may obtain a copy of the License at
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12 // http://www.apache.org/licenses/LICENSE-2.0
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13 // Unless required by applicable law or agreed to in writing, software
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14 // distributed under the License is distributed on an "AS IS" BASIS,
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15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 // See the License for the specific language governing permissions and
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17 // limitations under the License.
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18 //
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19 ///////////////////////////////////////////////////////////////////////
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21 #ifndef TESSERACT_CCUTIL_UNICHARCOMPRESS_H_
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22 #define TESSERACT_CCUTIL_UNICHARCOMPRESS_H_
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23
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24 #include <unordered_map>
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25 #include <vector>
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26 #include "serialis.h"
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27 #include "unicharset.h"
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29 namespace tesseract {
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30
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31 // Trivial class to hold the code for a recoded unichar-id.
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32 class RecodedCharID {
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33 public:
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34 // The maximum length of a code.
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35 static const int kMaxCodeLen = 9;
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36
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37 RecodedCharID() : self_normalized_(1), length_(0) {
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38 memset(code_, 0, sizeof(code_));
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39 }
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40 void Truncate(int length) {
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41 length_ = length;
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42 }
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43 // Sets the code value at the given index in the code.
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44 void Set(int index, int value) {
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45 code_[index] = value;
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46 if (length_ <= index) {
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47 length_ = index + 1;
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48 }
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49 }
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50 // Shorthand for setting codes of length 3, as all Hangul and Han codes are
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51 // length 3.
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52 void Set3(int code0, int code1, int code2) {
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53 length_ = 3;
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54 code_[0] = code0;
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55 code_[1] = code1;
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56 code_[2] = code2;
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57 }
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58 bool empty() const {
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59 return length_ == 0;
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60 }
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61 // Accessors
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62 int length() const {
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63 return length_;
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64 }
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65 int operator()(int index) const {
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66 return code_[index];
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67 }
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68
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69 // Writes to the given file. Returns false in case of error.
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70 bool Serialize(TFile *fp) const {
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71 return fp->Serialize(&self_normalized_) && fp->Serialize(&length_) &&
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72 fp->Serialize(&code_[0], length_);
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73 }
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74 // Reads from the given file. Returns false in case of error.
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75 bool DeSerialize(TFile *fp) {
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76 return fp->DeSerialize(&self_normalized_) && fp->DeSerialize(&length_) &&
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77 fp->DeSerialize(&code_[0], length_);
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78 }
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79 bool operator==(const RecodedCharID &other) const {
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80 if (length_ != other.length_) {
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81 return false;
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82 }
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83 for (int i = 0; i < length_; ++i) {
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84 if (code_[i] != other.code_[i]) {
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85 return false;
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86 }
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87 }
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88 return true;
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89 }
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90 // Hash functor for RecodedCharID.
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91 struct RecodedCharIDHash {
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92 uint64_t operator()(const RecodedCharID &code) const {
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93 uint64_t result = 0;
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94 for (int i = 0; i < code.length_; ++i) {
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95 result ^= static_cast<uint64_t>(code(i)) << (7 * i);
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96 }
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97 return result;
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98 }
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99 };
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100
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101 private:
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102 // True if this code is self-normalizing, ie is the master entry for indices
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103 // that map to the same code. Has boolean value, but int8_t for serialization.
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104 int8_t self_normalized_;
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parents:
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105 // The number of elements in use in code_;
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parents:
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106 int32_t length_;
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107 // The re-encoded form of the unichar-id to which this RecodedCharID relates.
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108 int32_t code_[kMaxCodeLen];
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109 };
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110
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111 // Class holds a "compression" of a unicharset to simplify the learning problem
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112 // for a neural-network-based classifier.
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113 // Objectives:
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114 // 1 (CJK): Ids of a unicharset with a large number of classes are expressed as
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115 // a sequence of 3 codes with much fewer values.
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116 // This is achieved using the Jamo coding for Hangul and the Unicode
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117 // Radical-Stroke-index for Han.
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118 // 2 (Indic): Instead of thousands of codes with one for each grapheme, re-code
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119 // as the unicode sequence (but coded in a more compact space).
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120 // 3 (the rest): Eliminate multi-path problems with ligatures and fold confusing
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121 // and not significantly distinct shapes (quotes) together, ie
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122 // represent the fi ligature as the f-i pair, and fold u+2019 and
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123 // friends all onto ascii single '
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124 // 4 The null character and mapping to target activations:
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125 // To save horizontal coding space, the compressed codes are generally mapped
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126 // to target network activations without intervening null characters, BUT
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127 // in the case of ligatures, such as ff, null characters have to be included
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128 // so existence of repeated codes is detected at codebook-building time, and
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129 // null characters are embedded directly into the codes, so the rest of the
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130 // system doesn't need to worry about the problem (much). There is still an
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131 // effect on the range of ways in which the target activations can be
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132 // generated.
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133 //
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134 // The computed code values are compact (no unused values), and, for CJK,
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135 // unique (each code position uses a disjoint set of values from each other code
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136 // position). For non-CJK, the same code value CAN be used in multiple
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137 // positions, eg the ff ligature is converted to <f> <nullchar> <f>, where <f>
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138 // is the same code as is used for the single f.
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139 class TESS_API UnicharCompress {
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140 public:
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141 UnicharCompress();
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142 UnicharCompress(const UnicharCompress &src);
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143 ~UnicharCompress();
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144 UnicharCompress &operator=(const UnicharCompress &src);
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145
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146 // The 1st Hangul unicode.
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parents:
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147 static const int kFirstHangul = 0xac00;
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148 // The number of Hangul unicodes.
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149 static const int kNumHangul = 11172;
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150 // The number of Jamos for each of the 3 parts of a Hangul character, being
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parents:
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151 // the Leading consonant, Vowel and Trailing consonant.
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152 static const int kLCount = 19;
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153 static const int kVCount = 21;
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154 static const int kTCount = 28;
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155
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156 // Computes the encoding for the given unicharset. It is a requirement that
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Franz Glasner <fzglas.hg@dom66.de>
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157 // the file training/langdata/radical-stroke.txt have been read into the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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158 // input string radical_stroke_table.
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parents:
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159 // Returns false if the encoding cannot be constructed.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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160 bool ComputeEncoding(const UNICHARSET &unicharset, int null_id, std::string *radical_stroke_table);
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161 // Sets up an encoder that doesn't change the unichars at all, so it just
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Franz Glasner <fzglas.hg@dom66.de>
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162 // passes them through unchanged.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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163 void SetupPassThrough(const UNICHARSET &unicharset);
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parents:
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164 // Sets up an encoder directly using the given encoding vector, which maps
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parents:
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165 // unichar_ids to the given codes.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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166 void SetupDirect(const std::vector<RecodedCharID> &codes);
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parents:
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167
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168 // Returns the number of different values that can be used in a code, ie
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parents:
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169 // 1 + the maximum value that will ever be used by an RecodedCharID code in
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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170 // any position in its array.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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171 int code_range() const {
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parents:
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172 return code_range_;
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173 }
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174
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175 // Encodes a single unichar_id. Returns the length of the code, (or zero if
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parents:
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176 // invalid input), and the encoding itself in code.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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177 int EncodeUnichar(unsigned unichar_id, RecodedCharID *code) const;
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178 // Decodes code, returning the original unichar-id, or
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parents:
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179 // INVALID_UNICHAR_ID if the input is invalid.
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parents:
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180 int DecodeUnichar(const RecodedCharID &code) const;
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parents:
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181 // Returns true if the given code is a valid start or single code.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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182 bool IsValidFirstCode(int code) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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183 return is_valid_start_[code];
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parents:
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184 }
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185 // Returns a list of valid non-final next codes for a given prefix code,
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parents:
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186 // which may be empty.
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parents:
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187 const std::vector<int> *GetNextCodes(const RecodedCharID &code) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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188 auto it = next_codes_.find(code);
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parents:
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189 return it == next_codes_.end() ? nullptr : it->second;
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parents:
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190 }
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parents:
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191 // Returns a list of valid final codes for a given prefix code, which may
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parents:
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192 // be empty.
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parents:
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193 const std::vector<int> *GetFinalCodes(const RecodedCharID &code) const {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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194 auto it = final_codes_.find(code);
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parents:
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195 return it == final_codes_.end() ? nullptr : it->second;
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196 }
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197
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198 // Writes to the given file. Returns false in case of error.
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199 bool Serialize(TFile *fp) const;
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200 // Reads from the given file. Returns false in case of error.
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201
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202 bool DeSerialize(TFile *fp);
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203
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204 // Returns a string containing a text file that describes the encoding thus:
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205 // <index>[,<index>]*<tab><UTF8-str><newline>
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206 // In words, a comma-separated list of one or more indices, followed by a tab
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207 // and the UTF-8 string that the code represents per line. Most simple scripts
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208 // will encode a single index to a UTF8-string, but Chinese, Japanese, Korean
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209 // and the Indic scripts will contain a many-to-many mapping.
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210 // See the class comment above for details.
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211 std::string GetEncodingAsString(const UNICHARSET &unicharset) const;
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212
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213 // Helper decomposes a Hangul unicode to 3 parts, leading, vowel, trailing.
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214 // Note that the returned values are 0-based indices, NOT unicode Jamo.
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215 // Returns false if the input is not in the Hangul unicode range.
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216 static bool DecomposeHangul(int unicode, int *leading, int *vowel, int *trailing);
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217
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218 private:
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219 // Renumbers codes to eliminate unused values.
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220 void DefragmentCodeValues(int encoded_null);
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221 // Computes the value of code_range_ from the encoder_.
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222 void ComputeCodeRange();
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223 // Initializes the decoding hash_map from the encoder_ array.
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224 void SetupDecoder();
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225 // Frees allocated memory.
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226 void Cleanup();
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227
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228 // The encoder that maps a unichar-id to a sequence of small codes.
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229 // encoder_ is the only part that is serialized. The rest is computed on load.
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230 std::vector<RecodedCharID> encoder_;
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231 // Decoder converts the output of encoder back to a unichar-id.
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232 std::unordered_map<RecodedCharID, int, RecodedCharID::RecodedCharIDHash> decoder_;
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233 // True if the index is a valid single or start code.
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234 std::vector<bool> is_valid_start_;
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235 // Maps a prefix code to a list of valid next codes.
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236 // The map owns the vectors.
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237 std::unordered_map<RecodedCharID, std::vector<int> *, RecodedCharID::RecodedCharIDHash>
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238 next_codes_;
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239 // Maps a prefix code to a list of valid final codes.
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240 // The map owns the vectors.
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241 std::unordered_map<RecodedCharID, std::vector<int> *, RecodedCharID::RecodedCharIDHash>
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242 final_codes_;
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243 // Max of any value in encoder_ + 1.
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244 int code_range_;
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245 };
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246
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247 } // namespace tesseract.
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248
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249 #endif // TESSERACT_CCUTIL_UNICHARCOMPRESS_H_