tesseract  5.0.0
validate_myanmar.h
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1 #ifndef TESSERACT_TRAINING_VALIDATE_MYANMAR_H_
2 #define TESSERACT_TRAINING_VALIDATE_MYANMAR_H_
3 
4 #include "validator.h"
5 
6 namespace tesseract {
7 
8 // Subclass of Validator that validates and segments Myanmar.
9 class ValidateMyanmar : public Validator {
10 public:
11  ValidateMyanmar(ViramaScript script, bool report_errors) : Validator(script, report_errors) {}
12  ~ValidateMyanmar() override = default;
13 
14 protected:
15  // Returns whether codes matches the pattern for a Myanmar Grapheme.
16  // Consumes the next Grapheme in codes_[codes_used_++...] and copies it to
17  // parts_ and output_. Returns true if a valid Grapheme was consumed,
18  // otherwise does not increment codes_used_.
19  bool ConsumeGraphemeIfValid() override;
20  // Returns the CharClass corresponding to the given Unicode ch.
22 
23 private:
24  // Helper consumes/copies a virama and any subscript consonant.
25  // Returns true if the end of input is reached.
26  bool ConsumeSubscriptIfPresent();
27  // Helper consumes/copies a series of optional signs.
28  // Returns true if the end of input is reached.
29  bool ConsumeOptionalSignsIfPresent();
30  // Returns true if the unicode is a Myanmar "letter" including consonants
31  // and independent vowels. Although table 16-3 distinguishes between some
32  // base consonants and vowels, the extensions make no such distinction, so we
33  // put them all into a single bucket.
34  static bool IsMyanmarLetter(char32 ch);
35  // Returns true if ch is a Myanmar digit or other symbol that does not take
36  // part in being a syllable.
37  static bool IsMyanmarOther(char32 ch);
38 
39  // Some special unicodes used only for Myanmar processing.
40  static const char32 kMyanmarAsat = 0x103a;
41  static const char32 kMyanmarMedialYa = 0x103b;
42 };
43 
44 } // namespace tesseract
45 
46 #endif // TESSERACT_TRAINING_VALIDATE_MYANMAR_H_
signed int char32
Definition: unichar.h:51
bool ConsumeGraphemeIfValid() override
Validator::CharClass UnicodeToCharClass(char32 ch) const override
ValidateMyanmar(ViramaScript script, bool report_errors)
~ValidateMyanmar() override=default