tesseract  5.0.0-alpha-619-ge9db
validate_grapheme.h
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1 #ifndef TESSERACT_TRAINING_VALIDATE_GRAPHEME_H_
2 #define TESSERACT_TRAINING_VALIDATE_GRAPHEME_H_
3 
4 #include "validator.h"
5 
6 namespace tesseract {
7 
8 // Subclass of Validator that validates and segments generic unicode into
9 // grapheme clusters, including Latin with diacritics.
10 class ValidateGrapheme : public Validator {
11  public:
12  ValidateGrapheme(ViramaScript script, bool report_errors)
13  : Validator(script, report_errors) {}
15 
16  protected:
17  // Consumes the next Grapheme in codes_[codes_used_++...] and copies it to
18  // parts_ and output_. Returns true if a valid Grapheme was consumed,
19  // otherwise does not increment codes_used_.
20  bool ConsumeGraphemeIfValid() override;
21  // Returns the CharClass corresponding to the given Unicode ch.
22  CharClass UnicodeToCharClass(char32 ch) const override;
23 
24  private:
25  // Helper returns true if the sequence prev_ch,ch is invalid.
26  bool IsBadlyFormed(char32 prev_ch, char32 ch);
27  // Helper returns true if the sequence prev_ch,ch is an invalid Indic vowel.
28  static bool IsBadlyFormedIndicVowel(char32 prev_ch, char32 ch);
29  // Helper returns true if the sequence prev_ch,ch is invalid Thai.
30  static bool IsBadlyFormedThai(char32 prev_ch, char32 ch);
31 };
32 
33 } // namespace tesseract
34 
35 #endif // TESSERACT_TRAINING_VALIDATE_GRAPHEME_H_
tesseract::ValidateGrapheme
Definition: validate_grapheme.h:10
tesseract::ViramaScript
ViramaScript
Definition: validator.h:67
tesseract::Validator::CharClass
CharClass
Definition: validator.h:126
validator.h
tesseract::char32
signed int char32
Definition: unichar.h:53
tesseract
Definition: baseapi.h:65
tesseract::ValidateGrapheme::ConsumeGraphemeIfValid
bool ConsumeGraphemeIfValid() override
Definition: validate_grapheme.cpp:7
tesseract::ValidateGrapheme::UnicodeToCharClass
CharClass UnicodeToCharClass(char32 ch) const override
Definition: validate_grapheme.cpp:52
tesseract::ValidateGrapheme::~ValidateGrapheme
~ValidateGrapheme()
Definition: validate_grapheme.h:14
tesseract::Validator
Definition: validator.h:86
tesseract::ValidateGrapheme::ValidateGrapheme
ValidateGrapheme(ViramaScript script, bool report_errors)
Definition: validate_grapheme.h:12