tesseract v5.3.3.20231005
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
6namespace tesseract {
7
8// Subclass of Validator that validates and segments Myanmar.
9class ValidateMyanmar : public Validator {
10public:
11 ValidateMyanmar(ViramaScript script, bool report_errors) : Validator(script, report_errors) {}
12 ~ValidateMyanmar() override = default;
13
14protected:
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
23private:
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:49
bool ConsumeGraphemeIfValid() override
Validator::CharClass UnicodeToCharClass(char32 ch) const override
ValidateMyanmar(ViramaScript script, bool report_errors)
~ValidateMyanmar() override=default