Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/dict/context.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 *
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3 * File: context.cpp (Formerly context.c)
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4 * Description: Context checking functions
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5 * Author: Mark Seaman, OCR Technology
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6 *
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7 * (c) Copyright 1990, 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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20 #include "dict.h"
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21 #include "unicharset.h"
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23 namespace tesseract {
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25 static const int kMinAbsoluteGarbageWordLength = 10;
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26 static const float kMinAbsoluteGarbageAlphanumFrac = 0.5f;
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28 const int case_state_table[6][4] = {
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29 {/* 0. Beginning of word */
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30 /* P U L D */
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31 /* -1. Error on case */
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32 0, 1, 5, 4},
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33 {/* 1. After initial capital */
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34 0, 3, 2, 4},
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35 {/* 2. After lower case */
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36 0, -1, 2, -1},
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37 {/* 3. After upper case */
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38 0, 3, -1, 4},
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39 {/* 4. After a digit */
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40 0, -1, -1, 4},
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41 {/* 5. After initial lower case */
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42 5, -1, 2, -1},
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43 };
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44
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45 int Dict::case_ok(const WERD_CHOICE &word) const {
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46 int state = 0;
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47 const UNICHARSET *unicharset = word.unicharset();
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48 for (unsigned x = 0; x < word.length(); ++x) {
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49 UNICHAR_ID ch_id = word.unichar_id(x);
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50 if (unicharset->get_isupper(ch_id)) {
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51 state = case_state_table[state][1];
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52 } else if (unicharset->get_islower(ch_id)) {
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53 state = case_state_table[state][2];
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54 } else if (unicharset->get_isdigit(ch_id)) {
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55 state = case_state_table[state][3];
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56 } else {
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57 state = case_state_table[state][0];
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58 }
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59 if (state == -1) {
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60 return false;
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61 }
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62 }
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63 return state != 5; // single lower is bad
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64 }
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65
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66 bool Dict::absolute_garbage(const WERD_CHOICE &word, const UNICHARSET &unicharset) {
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67 if (word.length() < kMinAbsoluteGarbageWordLength) {
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68 return false;
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69 }
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70 int num_alphanum = 0;
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71 for (unsigned x = 0; x < word.length(); ++x) {
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72 num_alphanum +=
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73 (unicharset.get_isalpha(word.unichar_id(x)) || unicharset.get_isdigit(word.unichar_id(x)));
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74 }
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75 return (static_cast<float>(num_alphanum) / static_cast<float>(word.length()) <
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76 kMinAbsoluteGarbageAlphanumFrac);
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77 }
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78
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79 } // namespace tesseract