Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/dict/trie.h @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> 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
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1 /******************************************************************************
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2 *
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3 * File: trie.h
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4 * Description: Functions to build a trie data structure.
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5 * Author: Mark Seaman, SW Productivity
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6 *
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7 * (c) Copyright 1987, Hewlett-Packard Company.
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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 #ifndef TRIE_H
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20 #define TRIE_H
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22 #include "dawg.h"
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24 namespace tesseract {
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26 class UNICHARSET;
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28 // Note: if we consider either NODE_REF or EDGE_INDEX to ever exceed
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29 // max int32, we will need to change vector to use int64 for size
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30 // and address indices. This does not seem to be needed immediately,
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31 // since currently the largest number of edges limit used by tesseract
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32 // (kMaxNumEdges in wordlist2dawg.cpp) is far less than max int32.
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33 // There are also int casts below to satisfy the WIN32 compiler that would
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34 // need to be changed.
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35 // It might be cleanest to change the types of most of the Trie/Dawg related
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36 // typedefs to int and restrict the casts to extracting these values from
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37 // the 64 bit EDGE_RECORD.
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38 using EDGE_INDEX = int64_t; // index of an edge in a given node
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39 using EDGE_VECTOR = std::vector<EDGE_RECORD>;
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41 struct TRIE_NODE_RECORD {
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42 EDGE_VECTOR forward_edges;
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43 EDGE_VECTOR backward_edges;
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44 };
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45 using TRIE_NODES = std::vector<TRIE_NODE_RECORD *>;
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46
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47 /**
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48 * Concrete class for Trie data structure that allows to store a list of
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49 * words (extends Dawg base class) as well as dynamically add new words.
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50 * This class stores a vector of pointers to TRIE_NODE_RECORDs, each of
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51 * which has a vector of forward and backward edges.
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52 */
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53 class TESS_API Trie : public Dawg {
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54 public:
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55 enum RTLReversePolicy {
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56 RRP_DO_NO_REVERSE,
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57 RRP_REVERSE_IF_HAS_RTL,
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58 RRP_FORCE_REVERSE,
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59 };
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60
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61 // Minimum number of concrete characters at the beginning of user patterns.
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62 static const int kSaneNumConcreteChars = 0;
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63 // Various unicode whitespace characters are used to denote unichar patterns,
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64 // (character classifier would never produce these whitespace characters as a
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65 // valid classification).
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66 static const char kAlphaPatternUnicode[];
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67 static const char kDigitPatternUnicode[];
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68 static const char kAlphanumPatternUnicode[];
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69 static const char kPuncPatternUnicode[];
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70 static const char kLowerPatternUnicode[];
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71 static const char kUpperPatternUnicode[];
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72
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73 static const char *get_reverse_policy_name(RTLReversePolicy reverse_policy);
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74
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75 // max_num_edges argument allows limiting the amount of memory this
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76 // Trie can consume (if a new word insert would cause the Trie to
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77 // contain more edges than max_num_edges, all the edges are cleared
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78 // so that new inserts can proceed).
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79 Trie(DawgType type, const std::string &lang, PermuterType perm, int unicharset_size, int debug_level)
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80 : Dawg(type, lang, perm, debug_level) {
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81 init(unicharset_size);
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82 deref_node_index_mask_ = ~letter_mask_;
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83 new_dawg_node(); // need to allocate node 0
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84 }
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85 ~Trie() override {
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86 for (auto node : nodes_) {
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87 delete node;
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88 }
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89 }
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90
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91 // Reset the Trie to empty.
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92 void clear();
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93
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94 /** Returns the edge that corresponds to the letter out of this node. */
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95 EDGE_REF edge_char_of(NODE_REF node_ref, UNICHAR_ID unichar_id, bool word_end) const override {
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96 EDGE_RECORD *edge_ptr;
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97 EDGE_INDEX edge_index;
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98 if (!edge_char_of(node_ref, NO_EDGE, FORWARD_EDGE, word_end, unichar_id, &edge_ptr,
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parents:
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99 &edge_index)) {
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100 return NO_EDGE;
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101 }
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102 return make_edge_ref(node_ref, edge_index);
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103 }
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104
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105 /**
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106 * Fills the given NodeChildVector with all the unichar ids (and the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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107 * corresponding EDGE_REFs) for which there is an edge out of this node.
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108 */
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109 void unichar_ids_of(NODE_REF node, NodeChildVector *vec, bool word_end) const override {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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110 const EDGE_VECTOR &forward_edges = nodes_[static_cast<int>(node)]->forward_edges;
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111 for (auto &edge : forward_edges) {
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112 if (!word_end || end_of_word_from_edge_rec(edge)) {
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113 vec->push_back(
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114 NodeChild(unichar_id_from_edge_rec(edge), make_edge_ref(node, &edge - &forward_edges[0])));
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115 }
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116 }
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117 }
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118
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119 /**
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120 * Returns the next node visited by following the edge
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121 * indicated by the given EDGE_REF.
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122 */
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123 NODE_REF next_node(EDGE_REF edge_ref) const override {
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124 if (edge_ref == NO_EDGE || num_edges_ == 0) {
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125 return NO_EDGE;
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126 }
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127 return next_node_from_edge_rec(*deref_edge_ref(edge_ref));
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128 }
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129
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130 /**
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131 * Returns true if the edge indicated by the given EDGE_REF
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132 * marks the end of a word.
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133 */
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134 bool end_of_word(EDGE_REF edge_ref) const override {
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135 if (edge_ref == NO_EDGE || num_edges_ == 0) {
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136 return false;
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137 }
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138 return end_of_word_from_edge_rec(*deref_edge_ref(edge_ref));
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139 }
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140
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141 /** Returns UNICHAR_ID stored in the edge indicated by the given EDGE_REF. */
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142 UNICHAR_ID edge_letter(EDGE_REF edge_ref) const override {
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143 if (edge_ref == NO_EDGE || num_edges_ == 0) {
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Franz Glasner <fzglas.hg@dom66.de>
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144 return INVALID_UNICHAR_ID;
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145 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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146 return unichar_id_from_edge_rec(*deref_edge_ref(edge_ref));
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147 }
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148 // Sets the UNICHAR_ID in the given edge_rec to unicharset_size_, marking
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149 // the edge dead.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 void KillEdge(EDGE_RECORD *edge_rec) const {
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parents:
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151 *edge_rec &= ~letter_mask_;
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parents:
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152 *edge_rec |= (unicharset_size_ << LETTER_START_BIT);
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153 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 bool DeadEdge(const EDGE_RECORD &edge_rec) const {
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155 return unichar_id_from_edge_rec(edge_rec) == unicharset_size_;
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156 }
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diff changeset
157
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parents:
diff changeset
158 // Prints the contents of the node indicated by the given NODE_REF.
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parents:
diff changeset
159 // At most max_num_edges will be printed.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 void print_node(NODE_REF node, int max_num_edges) const override;
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parents:
diff changeset
161
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parents:
diff changeset
162 // Writes edges from nodes_ to an EDGE_ARRAY and creates a SquishedDawg.
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
163 // Eliminates redundant edges and returns the pointer to the SquishedDawg.
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parents:
diff changeset
164 // Note: the caller is responsible for deallocating memory associated
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parents:
diff changeset
165 // with the returned SquishedDawg pointer.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 SquishedDawg *trie_to_dawg();
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parents:
diff changeset
167
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parents:
diff changeset
168 // Reads a list of words from the given file and adds into the Trie.
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parents:
diff changeset
169 // Calls WERD_CHOICE::reverse_unichar_ids_if_rtl() according to the reverse
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 // policy and information in the unicharset.
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parents:
diff changeset
171 // Returns false on error.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172 bool read_and_add_word_list(const char *filename, const UNICHARSET &unicharset,
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
173 Trie::RTLReversePolicy reverse);
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parents:
diff changeset
174
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parents:
diff changeset
175 // Reads a list of words from the given file.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 // Returns false on error.
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
177 bool read_word_list(const char *filename, std::vector<std::string> *words);
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
178 // Adds a list of words previously read using read_word_list to the trie
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parents:
diff changeset
179 // using the given unicharset and reverse_policy to convert to unichar-ids.
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parents:
diff changeset
180 // Returns false on error.
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
181 bool add_word_list(const std::vector<std::string> &words, const UNICHARSET &unicharset,
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
182 Trie::RTLReversePolicy reverse_policy);
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parents:
diff changeset
183
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 // Inserts the list of patterns from the given file into the Trie.
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
185 // The pattern list file should contain one pattern per line in UTF-8 format.
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
186 //
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diff changeset
187 // Each pattern can contain any non-whitespace characters, however only the
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
188 // patterns that contain characters from the unicharset of the corresponding
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 // language will be useful.
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parents:
diff changeset
190 // The only meta character is '\'. To be used in a pattern as an ordinary
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 // string it should be escaped with '\' (e.g. string "C:\Documents" should
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
192 // be written in the patterns file as "C:\\Documents").
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 // This function supports a very limited regular expression syntax. One can
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 // express a character, a certain character class and a number of times the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 // entity should be repeated in the pattern.
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196 //
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197 // To denote a character class use one of:
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198 // \c - unichar for which UNICHARSET::get_isalpha() is true (character)
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199 // \d - unichar for which UNICHARSET::get_isdigit() is true
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200 // \n - unichar for which UNICHARSET::get_isdigit() or
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201 // UNICHARSET::isalpha() are true
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202 // \p - unichar for which UNICHARSET::get_ispunct() is true
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203 // \a - unichar for which UNICHARSET::get_islower() is true
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204 // \A - unichar for which UNICHARSET::get_isupper() is true
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205 //
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206 // \* could be specified after each character or pattern to indicate that
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207 // the character/pattern can be repeated any number of times before the next
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208 // character/pattern occurs.
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209 //
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210 // Examples:
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211 // 1-8\d\d-GOOG-411 will be expanded to strings:
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212 // 1-800-GOOG-411, 1-801-GOOG-411, ... 1-899-GOOG-411.
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213 //
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214 // http://www.\n\*.com will be expanded to strings like:
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215 // http://www.a.com http://www.a123.com ... http://www.ABCDefgHIJKLMNop.com
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216 //
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217 // Note: In choosing which patterns to include please be aware of the fact
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218 // providing very generic patterns will make tesseract run slower.
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219 // For example \n\* at the beginning of the pattern will make Tesseract
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220 // consider all the combinations of proposed character choices for each
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221 // of the segmentations, which will be unacceptably slow.
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222 // Because of potential problems with speed that could be difficult to
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223 // identify, each user pattern has to have at least kSaneNumConcreteChars
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224 // concrete characters from the unicharset at the beginning.
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225 bool read_pattern_list(const char *filename, const UNICHARSET &unicharset);
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226
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227 // Initializes the values of *_pattern_ unichar ids.
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228 // This function should be called before calling read_pattern_list().
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229 void initialize_patterns(UNICHARSET *unicharset);
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230
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231 // Fills in the given unichar id vector with the unichar ids that represent
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232 // the patterns of the character classes of the given unichar_id.
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233 void unichar_id_to_patterns(UNICHAR_ID unichar_id, const UNICHARSET &unicharset,
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234 std::vector<UNICHAR_ID> *vec) const override;
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235
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236 // Returns the given EDGE_REF if the EDGE_RECORD that it points to has
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237 // a self loop and the given unichar_id matches the unichar_id stored in the
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238 // EDGE_RECORD, returns NO_EDGE otherwise.
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239 EDGE_REF pattern_loop_edge(EDGE_REF edge_ref, UNICHAR_ID unichar_id,
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240 bool word_end) const override {
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241 if (edge_ref == NO_EDGE) {
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242 return NO_EDGE;
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243 }
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244 EDGE_RECORD *edge_rec = deref_edge_ref(edge_ref);
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245 return (marker_flag_from_edge_rec(*edge_rec) &&
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246 unichar_id == unichar_id_from_edge_rec(*edge_rec) &&
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247 word_end == end_of_word_from_edge_rec(*edge_rec))
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248 ? edge_ref
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249 : NO_EDGE;
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250 }
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251
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252 // Adds a word to the Trie (creates the necessary nodes and edges).
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253 //
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254 // If repetitions vector is not nullptr, each entry in the vector indicates
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255 // whether the unichar id with the corresponding index in the word is allowed
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256 // to repeat an unlimited number of times. For each entry that is true, MARKER
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257 // flag of the corresponding edge created for this unichar id is set to true).
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258 //
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259 // Return true if add succeeded, false otherwise (e.g. when a word contained
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260 // an invalid unichar id or the trie was getting too large and was cleared).
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261 bool add_word_to_dawg(const WERD_CHOICE &word, const std::vector<bool> *repetitions);
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262 bool add_word_to_dawg(const WERD_CHOICE &word) {
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263 return add_word_to_dawg(word, nullptr);
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264 }
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265
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266 protected:
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267 // The structure of an EDGE_REF for Trie edges is as follows:
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268 // [LETTER_START_BIT, flag_start_bit_):
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269 // edge index in *_edges in a TRIE_NODE_RECORD
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270 // [flag_start_bit, 30th bit]: node index in nodes (TRIE_NODES vector)
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271 //
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272 // With this arrangement there are enough bits to represent edge indices
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273 // (each node can have at most unicharset_size_ forward edges and
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274 // the position of flag_start_bit is set to be log2(unicharset_size_)).
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275 // It is also possible to accommodate a maximum number of nodes that is at
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276 // least as large as that of the SquishedDawg representation (in SquishedDawg
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277 // each EDGE_RECORD has 32-(flag_start_bit+NUM_FLAG_BITS) bits to represent
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278 // the next node index).
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279 //
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280
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281 // Returns the pointer to EDGE_RECORD after decoding the location
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282 // of the edge from the information in the given EDGE_REF.
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283 // This function assumes that EDGE_REF holds valid node/edge indices.
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284 inline EDGE_RECORD *deref_edge_ref(EDGE_REF edge_ref) const {
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285 int edge_index = static_cast<int>((edge_ref & letter_mask_) >> LETTER_START_BIT);
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286 int node_index = static_cast<int>((edge_ref & deref_node_index_mask_) >> flag_start_bit_);
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287 TRIE_NODE_RECORD *node_rec = nodes_[node_index];
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288 return &(node_rec->forward_edges[edge_index]);
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289 }
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diff changeset
290 /** Constructs EDGE_REF from the given node_index and edge_index. */
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
291 inline EDGE_REF make_edge_ref(NODE_REF node_index, EDGE_INDEX edge_index) const {
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
292 return ((node_index << flag_start_bit_) | (edge_index << LETTER_START_BIT));
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
293 }
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
294 /** Sets up this edge record to the requested values. */
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
295 inline void link_edge(EDGE_RECORD *edge, NODE_REF nxt, bool repeats, int direction, bool word_end,
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
296 UNICHAR_ID unichar_id) {
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
297 EDGE_RECORD flags = 0;
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
298 if (repeats) {
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
299 flags |= MARKER_FLAG;
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
300 }
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
301 if (word_end) {
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
302 flags |= WERD_END_FLAG;
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
303 }
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
304 if (direction == BACKWARD_EDGE) {
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
305 flags |= DIRECTION_FLAG;
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
306 }
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
307 *edge = ((nxt << next_node_start_bit_) | (static_cast<EDGE_RECORD>(flags) << flag_start_bit_) |
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
308 (static_cast<EDGE_RECORD>(unichar_id) << LETTER_START_BIT));
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
309 }
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
310 /** Prints the given EDGE_RECORD. */
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
311 inline void print_edge_rec(const EDGE_RECORD &edge_rec) const {
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
312 tprintf("|" REFFORMAT "|%s%s%s|%d|", next_node_from_edge_rec(edge_rec),
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
313 marker_flag_from_edge_rec(edge_rec) ? "R," : "",
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
314 (direction_from_edge_rec(edge_rec) == FORWARD_EDGE) ? "F" : "B",
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
315 end_of_word_from_edge_rec(edge_rec) ? ",E" : "", unichar_id_from_edge_rec(edge_rec));
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
316 }
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
317 // Returns true if the next node in recorded the given EDGE_RECORD
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
318 // has exactly one forward edge.
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
319 inline bool can_be_eliminated(const EDGE_RECORD &edge_rec) {
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
320 NODE_REF node_ref = next_node_from_edge_rec(edge_rec);
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
321 return (node_ref != NO_EDGE && nodes_[static_cast<int>(node_ref)]->forward_edges.size() == 1);
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
322 }
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
323
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
324 // Prints the contents of the Trie.
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
325 // At most max_num_edges will be printed for each node.
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
326 void print_all(const char *msg, int max_num_edges) {
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
327 tprintf("\n__________________________\n%s\n", msg);
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
328 for (size_t i = 0; i < nodes_.size(); ++i) {
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
329 print_node(i, max_num_edges);
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
330 }
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
331 tprintf("__________________________\n");
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
332 }
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
333
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
334 // Finds the edge with the given direction, word_end and unichar_id
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
335 // in the node indicated by node_ref. Fills in the pointer to the
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
336 // EDGE_RECORD and the index of the edge with the values
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
337 // corresponding to the edge found. Returns true if an edge was found.
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
338 bool edge_char_of(NODE_REF node_ref, NODE_REF next_node, int direction, bool word_end,
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
339 UNICHAR_ID unichar_id, EDGE_RECORD **edge_ptr, EDGE_INDEX *edge_index) const;
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
340
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
341 // Adds an single edge linkage between node1 and node2 in the direction
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
342 // indicated by direction argument.
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
343 bool add_edge_linkage(NODE_REF node1, NODE_REF node2, bool repeats, int direction, bool word_end,
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
344 UNICHAR_ID unichar_id);
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
345
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
346 // Adds forward edge linkage from node1 to node2 and the corresponding
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
347 // backward edge linkage in the other direction.
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
348 bool add_new_edge(NODE_REF node1, NODE_REF node2, bool repeats, bool word_end,
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
349 UNICHAR_ID unichar_id) {
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
350 return (add_edge_linkage(node1, node2, repeats, FORWARD_EDGE, word_end, unichar_id) &&
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
351 add_edge_linkage(node2, node1, repeats, BACKWARD_EDGE, word_end, unichar_id));
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
352 }
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
353
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
354 // Sets the word ending flags in an already existing edge pair.
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
355 // Returns true on success.
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
356 void add_word_ending(EDGE_RECORD *edge, NODE_REF the_next_node, bool repeats,
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
357 UNICHAR_ID unichar_id);
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
358
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
359 // Allocates space for a new node in the Trie.
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
360 NODE_REF new_dawg_node();
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
361
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
362 // Removes a single edge linkage to between node1 and node2 in the
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
363 // direction indicated by direction argument.
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
364 void remove_edge_linkage(NODE_REF node1, NODE_REF node2, int direction, bool word_end,
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
365 UNICHAR_ID unichar_id);
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
366
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
367 // Removes forward edge linkage from node1 to node2 and the corresponding
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
368 // backward edge linkage in the other direction.
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
369 void remove_edge(NODE_REF node1, NODE_REF node2, bool word_end, UNICHAR_ID unichar_id) {
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
370 remove_edge_linkage(node1, node2, FORWARD_EDGE, word_end, unichar_id);
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
371 remove_edge_linkage(node2, node1, BACKWARD_EDGE, word_end, unichar_id);
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
372 }
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
373
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
374 // Compares edge1 and edge2 in the given node to see if they point to two
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
375 // next nodes that could be collapsed. If they do, performs the reduction
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
376 // and returns true.
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
377 bool eliminate_redundant_edges(NODE_REF node, const EDGE_RECORD &edge1, const EDGE_RECORD &edge2);
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
378
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
379 // Assuming that edge_index indicates the first edge in a group of edges
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
380 // in this node with a particular letter value, looks through these edges
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
381 // to see if any of them can be collapsed. If so does it. Returns to the
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
382 // caller when all edges with this letter have been reduced.
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
383 // Returns true if further reduction is possible with this same letter.
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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384 bool reduce_lettered_edges(EDGE_INDEX edge_index, UNICHAR_ID unichar_id, NODE_REF node,
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385 EDGE_VECTOR *backward_edges, std::vector<bool> &reduced_nodes);
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386
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387 /**
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388 * Order num_edges of consecutive EDGE_RECORDS in the given EDGE_VECTOR in
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389 * increasing order of unichar ids. This function is normally called
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390 * for all edges in a single node, and since number of edges in each node
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391 * is usually quite small, selection sort is used.
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392 */
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393 void sort_edges(EDGE_VECTOR *edges);
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394
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395 /** Eliminates any redundant edges from this node in the Trie. */
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396 void reduce_node_input(NODE_REF node, std::vector<bool> &reduced_nodes);
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397
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398 // Returns the pattern unichar id for the given character class code.
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399 UNICHAR_ID character_class_to_pattern(char ch);
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400
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401 // Member variables
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402 TRIE_NODES nodes_; // vector of nodes in the Trie
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403 // Freelist of edges in the root backwards node that were previously zeroed.
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404 std::vector<EDGE_INDEX> root_back_freelist_;
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405 uint64_t num_edges_ = 0; // sum of all edges (forward and backward)
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406 uint64_t deref_direction_mask_ = 0; // mask for EDGE_REF to extract direction
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407 uint64_t deref_node_index_mask_ = 0; // mask for EDGE_REF to extract node index
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408 // Variables for translating character class codes denoted in user patterns
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409 // file to the unichar ids used to represent them in a Trie.
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410 UNICHAR_ID alpha_pattern_ = 0;
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411 UNICHAR_ID digit_pattern_ = 0;
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412 UNICHAR_ID alphanum_pattern_ = 0;
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413 UNICHAR_ID punc_pattern_ = 0;
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414 UNICHAR_ID lower_pattern_ = 0;
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415 UNICHAR_ID upper_pattern_ = 0;
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416 bool initialized_patterns_ = false;
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417 };
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418
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419 } // namespace tesseract
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420
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421 #endif