tesseract 4.1.1
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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 {
10 public:
11 ValidateMyanmar(ViramaScript script, bool report_errors)
12 : Validator(script, report_errors) {}
14
15 protected:
16 // Returns whether codes matches the pattern for a Myanmar Grapheme.
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.
23
24 private:
25 // Helper consumes/copies a virama and any subscript consonant.
26 // Returns true if the end of input is reached.
27 bool ConsumeSubscriptIfPresent();
28 // Helper consumes/copies a series of optional signs.
29 // Returns true if the end of input is reached.
30 bool ConsumeOptionalSignsIfPresent();
31 // Returns true if the unicode is a Myanmar "letter" including consonants
32 // and independent vowels. Although table 16-3 distinguishes between some
33 // base consonants and vowels, the extensions make no such distinction, so we
34 // put them all into a single bucket.
35 static bool IsMyanmarLetter(char32 ch);
36 // Returns true if ch is a Myanmar digit or other symbol that does not take
37 // part in being a syllable.
38 static bool IsMyanmarOther(char32 ch);
39
40 // Some special unicodes used only for Myanmar processing.
41 static const char32 kMyanmarAsat = 0x103a;
42 static const char32 kMyanmarMedialYa = 0x103b;
43};
44
45} // namespace tesseract
46
47#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)