Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/unicharmap.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: unicharmap.cpp
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3 // Description: Unicode character/ligature to integer id class.
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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 #include "unicharmap.h"
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21 #include <tesseract/unichar.h>
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23 #include <cassert>
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25 namespace tesseract {
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27 UNICHARMAP::UNICHARMAP() : nodes(nullptr) {}
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29 UNICHARMAP::~UNICHARMAP() {
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30 delete[] nodes;
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31 }
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32
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33 // Search the given unichar representation in the tree, using length characters
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34 // from it maximum. Each character in the string is interpreted as an index in
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35 // an array of nodes.
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36 UNICHAR_ID UNICHARMAP::unichar_to_id(const char *const unichar_repr, int length) const {
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37 UNICHARMAP_NODE *current_nodes = nodes;
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38
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39 assert(*unichar_repr != '\0');
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40 assert(length > 0 && length <= UNICHAR_LEN);
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42 int index = 0;
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43 if (length <= 0 || unichar_repr[index] == '\0') {
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44 return INVALID_UNICHAR_ID;
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45 }
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46 do {
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47 if (index + 1 >= length || unichar_repr[index + 1] == '\0') {
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48 return current_nodes[static_cast<unsigned char>(unichar_repr[index])].id;
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49 }
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50 current_nodes = current_nodes[static_cast<unsigned char>(unichar_repr[index])].children;
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51 ++index;
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52 } while (true);
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53 }
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54
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55 // Search the given unichar representation in the tree, creating the possibly
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56 // missing nodes. Once the right place has been found, insert the given id and
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57 // update the inserted flag to keep track of the insert. Each character in the
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58 // string is interpreted as an index in an array of nodes.
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59 void UNICHARMAP::insert(const char *const unichar_repr, UNICHAR_ID id) {
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60 const char *current_char = unichar_repr;
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61 if (*current_char == '\0') {
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62 return;
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63 }
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64 UNICHARMAP_NODE **current_nodes_pointer = &nodes;
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65 do {
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66 if (*current_nodes_pointer == nullptr) {
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67 *current_nodes_pointer = new UNICHARMAP_NODE[256];
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68 }
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69 if (current_char[1] == '\0') {
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70 (*current_nodes_pointer)[static_cast<unsigned char>(*current_char)].id = id;
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71 return;
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72 }
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73 current_nodes_pointer =
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74 &((*current_nodes_pointer)[static_cast<unsigned char>(*current_char)].children);
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75 ++current_char;
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76 } while (true);
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77 }
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78
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79 // Search the given unichar representation in the tree, using length characters
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80 // from it maximum. Each character in the string is interpreted as an index in
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81 // an array of nodes. Stop once the tree does not have anymore nodes or once we
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82 // found the right unichar_repr.
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83 bool UNICHARMAP::contains(const char *const unichar_repr, int length) const {
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84 if (unichar_repr == nullptr || *unichar_repr == '\0') {
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85 return false;
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86 }
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87 if (length <= 0 || length > UNICHAR_LEN) {
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88 return false;
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89 }
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90 int index = 0;
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91 if (unichar_repr[index] == '\0') {
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92 return false;
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93 }
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94 UNICHARMAP_NODE *current_nodes = nodes;
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95
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96 while (current_nodes != nullptr && index + 1 < length && unichar_repr[index + 1] != '\0') {
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97 current_nodes = current_nodes[static_cast<unsigned char>(unichar_repr[index])].children;
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98 ++index;
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99 }
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100 return current_nodes != nullptr && (index + 1 >= length || unichar_repr[index + 1] == '\0') &&
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101 current_nodes[static_cast<unsigned char>(unichar_repr[index])].id >= 0;
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102 }
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103
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104 // Return the minimum number of characters that must be used from this string
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105 // to obtain a match in the UNICHARMAP.
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106 int UNICHARMAP::minmatch(const char *const unichar_repr) const {
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107 const char *current_char = unichar_repr;
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108 if (*current_char == '\0') {
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109 return 0;
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110 }
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111 UNICHARMAP_NODE *current_nodes = nodes;
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112
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113 while (current_nodes != nullptr && *current_char != '\0') {
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114 if (current_nodes[static_cast<unsigned char>(*current_char)].id >= 0) {
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115 return current_char + 1 - unichar_repr;
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116 }
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117 current_nodes = current_nodes[static_cast<unsigned char>(*current_char)].children;
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118 ++current_char;
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119 }
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120 return 0;
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121 }
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122
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123 void UNICHARMAP::clear() {
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124 delete[] nodes;
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125 nodes = nullptr;
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126 }
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127
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128 UNICHARMAP::UNICHARMAP_NODE::UNICHARMAP_NODE() : children(nullptr), id(-1) {}
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129
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130 // Recursively delete the children
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131 UNICHARMAP::UNICHARMAP_NODE::~UNICHARMAP_NODE() {
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132 delete[] children;
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133 }
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134
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135 } // namespace tesseract