Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/unicharset/normstrngs.h @ 44:0a8b06e38e19

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Need "packaging" at wheel build time too. Parsing of version_p into a tuple now is done at build time.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:16:23 +0200
parents b50eed0cc0ef
children
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1 /**********************************************************************
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2 * File: normstrngs.h
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3 * Description: Utilities to normalize and manipulate UTF-32 and
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4 * UTF-8 strings.
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5 * Author: Ranjith Unnikrishnan
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6 * Created: Thu July 4 2013
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7 *
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8 * (C) Copyright 2013, 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_NORMSTRNGS_H_
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22 #define TESSERACT_CCUTIL_NORMSTRNGS_H_
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24 #include "export.h"
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26 #include "validator.h"
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28 #include <string>
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29 #include <vector>
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31 namespace tesseract {
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33 // The standard unicode normalizations.
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34 enum class UnicodeNormMode {
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35 kNFD,
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36 kNFC,
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37 kNFKD,
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38 kNFKC,
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39 };
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41 // To normalize away differences in punctuation that are ambiguous, like
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42 // curly quotes and different widths of dash.
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43 enum class OCRNorm {
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44 kNone,
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45 kNormalize,
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46 };
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48 // To validate and normalize away some subtle differences that can occur in
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49 // Indic scripts, eg ensuring that an explicit virama is always followed by
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50 // a zero-width non-joiner.
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51 enum class GraphemeNorm {
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52 kNone,
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53 kNormalize,
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54 };
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56 // Normalizes a UTF8 string according to the given modes. Returns true on
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57 // success. If false is returned, some failure or invalidity was present, and
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58 // the result string is produced on a "best effort" basis.
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59 TESS_UNICHARSET_TRAINING_API
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60 bool NormalizeUTF8String(UnicodeNormMode u_mode, OCRNorm ocr_normalize,
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61 GraphemeNorm grapheme_normalize, const char *str8,
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62 std::string *normalized);
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64 // Normalizes a UTF8 string according to the given modes and splits into
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65 // graphemes according to g_mode. Returns true on success. If false is returned,
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66 // some failure or invalidity was present, and the result string is produced on
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67 // a "best effort" basis.
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68 TESS_UNICHARSET_TRAINING_API
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69 bool NormalizeCleanAndSegmentUTF8(UnicodeNormMode u_mode, OCRNorm ocr_normalize,
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70 GraphemeNormMode g_mode, bool report_errors, const char *str8,
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71 std::vector<std::string> *graphemes);
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73 // Applies just the OCR-specific normalizations and return the normalized char.
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74 char32 OCRNormalize(char32 ch);
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76 // Returns true if the OCRNormalized ch1 and ch2 are the same.
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77 bool IsOCREquivalent(char32 ch1, char32 ch2);
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79 // Returns true if the value lies in the range of valid unicodes.
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80 bool IsValidCodepoint(const char32 ch);
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82 // Returns true a code point has the White_Space Unicode property.
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83 TESS_UNICHARSET_TRAINING_API
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84 bool IsWhitespace(const char32 ch);
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86 // Returns true if every char in the given (null-terminated) string has the
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87 // White_Space Unicode property.
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88 TESS_UNICHARSET_TRAINING_API
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89 bool IsUTF8Whitespace(const char *text);
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91 // Returns the length of bytes of the prefix of 'text' that have the White_Space
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92 // unicode property.
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93 TESS_UNICHARSET_TRAINING_API
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94 unsigned int SpanUTF8Whitespace(const char *text);
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96 // Returns the length of bytes of the prefix of 'text' that DO NOT have the
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97 // White_Space unicode property.
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98 TESS_UNICHARSET_TRAINING_API
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99 unsigned int SpanUTF8NotWhitespace(const char *text);
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100
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101 // Returns true if the char is interchange valid i.e. no C0 or C1 control codes
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102 // (other than CR LF HT FF) and no non-characters.
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103 TESS_UNICHARSET_TRAINING_API
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104 bool IsInterchangeValid(const char32 ch);
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105
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106 // Same as above but restricted to 7-bit ASCII.
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107 TESS_UNICHARSET_TRAINING_API
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108 bool IsInterchangeValid7BitAscii(const char32 ch);
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109
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110 // Convert a full-width UTF-8 string to half-width.
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111 TESS_UNICHARSET_TRAINING_API
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112 char32 FullwidthToHalfwidth(const char32 ch);
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113
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114 } // namespace tesseract
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115
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116 #endif // TESSERACT_CCUTIL_NORMSTRNGS_H_