Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/unicharset_extractor.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 ///////////////////////////////////////////////////////////////////////
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2 // File: unicharset_extractor.cpp
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3 // Description: Unicode character/ligature set extractor.
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4 // Author: Thomas Kielbus
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5 //
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6 // (C) Copyright 2006, Google Inc.
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7 // Licensed under the Apache License, Version 2.0 (the "License");
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8 // you may not use this file except in compliance with the License.
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9 // You may obtain a copy of the License at
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10 // http://www.apache.org/licenses/LICENSE-2.0
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11 // Unless required by applicable law or agreed to in writing, software
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12 // distributed under the License is distributed on an "AS IS" BASIS,
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13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 // See the License for the specific language governing permissions and
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15 // limitations under the License.
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16 //
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17 ///////////////////////////////////////////////////////////////////////
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19 // Given a list of box files or text files on the command line, this program
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20 // normalizes the text according to command-line options and generates
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21 // a unicharset.
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22
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23 #include <cstdlib>
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24 #include <filesystem>
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25 #include "boxread.h"
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26 #include "commandlineflags.h"
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27 #include "commontraining.h" // CheckSharedLibraryVersion
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28 #include "lang_model_helpers.h"
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29 #include "normstrngs.h"
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30 #include "unicharset.h"
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31 #include "unicharset_training_utils.h"
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32
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33 using namespace tesseract;
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34
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35 static STRING_PARAM_FLAG(output_unicharset, "unicharset", "Output file path");
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36 static INT_PARAM_FLAG(norm_mode, 1,
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37 "Normalization mode: 1=Combine graphemes, "
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38 "2=Split graphemes, 3=Pure unicode");
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40 namespace tesseract {
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41
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42 // Helper normalizes and segments the given strings according to norm_mode, and
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43 // adds the segmented parts to unicharset.
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44 static void AddStringsToUnicharset(const std::vector<std::string> &strings, int norm_mode,
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45 UNICHARSET *unicharset) {
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46 for (const auto &string : strings) {
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47 std::vector<std::string> normalized;
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48 if (NormalizeCleanAndSegmentUTF8(UnicodeNormMode::kNFC, OCRNorm::kNone,
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49 static_cast<GraphemeNormMode>(norm_mode),
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50 /*report_errors*/ true, string.c_str(), &normalized)) {
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51 for (const std::string &normed : normalized) {
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52 // normed is a UTF-8 encoded string
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53 if (normed.empty() || IsUTF8Whitespace(normed.c_str())) {
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54 continue;
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55 }
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56 unicharset->unichar_insert(normed.c_str());
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57 }
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58 } else {
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59 tprintf("Normalization failed for string '%s'\n", string.c_str());
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60 }
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61 }
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62 }
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63
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64 static int Main(int argc, char **argv) {
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65 UNICHARSET unicharset;
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66 // Load input files
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67 for (int arg = 1; arg < argc; ++arg) {
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68 std::filesystem::path filePath = argv[arg];
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69 std::string file_data = tesseract::ReadFile(argv[arg]);
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70 if (file_data.empty()) {
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71 continue;
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72 }
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73 std::vector<std::string> texts;
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74 if (filePath.extension() == ".box") {
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75 tprintf("Extracting unicharset from box file %s\n", argv[arg]);
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76 bool res = ReadMemBoxes(-1, /*skip_blanks*/ true, &file_data[0],
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77 /*continue_on_failure*/ false, /*boxes*/ nullptr, &texts,
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78 /*box_texts*/ nullptr, /*pages*/ nullptr);
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79 if (!res) {
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80 tprintf("Cannot read box data from '%s'\n", argv[arg]);
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81 return EXIT_FAILURE;
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82 }
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83 } else {
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84 tprintf("Extracting unicharset from plain text file %s\n", argv[arg]);
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85 texts.clear();
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86 texts = split(file_data, '\n');
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87 }
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88 AddStringsToUnicharset(texts, FLAGS_norm_mode, &unicharset);
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89 }
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90 SetupBasicProperties(/*report_errors*/ true, /*decompose*/ false, &unicharset);
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91 // Write unicharset file.
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92 if (unicharset.save_to_file(FLAGS_output_unicharset.c_str())) {
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93 tprintf("Wrote unicharset file %s\n", FLAGS_output_unicharset.c_str());
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94 } else {
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95 tprintf("Cannot save unicharset file %s\n", FLAGS_output_unicharset.c_str());
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96 return EXIT_FAILURE;
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97 }
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98 return EXIT_SUCCESS;
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99 }
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100
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101 } // namespace tesseract
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102
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103 int main(int argc, char **argv) {
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104 tesseract::CheckSharedLibraryVersion();
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105 if (argc > 1) {
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106 tesseract::ParseCommandLineFlags(argv[0], &argc, &argv, true);
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107 }
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108 if (argc < 2) {
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109 tprintf(
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110 "Usage: %s [--output_unicharset filename] [--norm_mode mode]"
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111 " box_or_text_file [...]\n",
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112 argv[0]);
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113 tprintf("Where mode means:\n");
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114 tprintf(" 1=combine graphemes (use for Latin and other simple scripts)\n");
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115 tprintf(" 2=split graphemes (use for Indic/Khmer/Myanmar)\n");
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116 tprintf(" 3=pure unicode (use for Arabic/Hebrew/Thai/Tibetan)\n");
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117 tprintf("Reads box or plain text files to extract the unicharset.\n");
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118 return EXIT_FAILURE;
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119 }
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120 return tesseract::Main(argc, argv);
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121 }