tesseract 4.1.1
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validate_indic.h
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1#ifndef TESSERACT_TRAINING_VALIDATE_INDIC_H_
2#define TESSERACT_TRAINING_VALIDATE_INDIC_H_
3
4#include "validator.h"
5
6namespace tesseract {
7
8// Subclass of Validator that validates and segments Indic scripts in the
9// unicode range 0x900-0xdff (Devanagari-Sinhala).
10class ValidateIndic : public Validator {
11 public:
12 ValidateIndic(ViramaScript script, bool report_errors)
13 : Validator(script, report_errors) {}
15
16 protected:
17 // Returns whether codes matches the pattern for an Indic Grapheme.
18 // Consumes the next Grapheme in codes_[codes_used_++...] and copies it to
19 // parts_ and output_. Returns true if a valid Grapheme was consumed,
20 // otherwise does not increment codes_used_.
21 bool ConsumeGraphemeIfValid() override;
22 // Returns the CharClass corresponding to the given Unicode ch.
24
25 private:
26 // Helper consumes/copies a virama and any associated post-virama joiners.
27 bool ConsumeViramaIfValid(IndicPair joiner, bool post_matra);
28 // Helper consumes/copies a series of consonants separated by viramas while
29 // valid, but not any vowel or other modifiers.
30 bool ConsumeConsonantHeadIfValid();
31 // Helper consumes/copies a tail part of a consonant, comprising optional
32 // matra/piece, vowel modifier, vedic mark, terminating virama.
33 bool ConsumeConsonantTailIfValid();
34 // Helper consumes/copies a vowel and optional modifiers.
35 bool ConsumeVowelIfValid();
36
37 // Some special unicodes used only for Indic processing.
38 static const char32 kYayana = 0xdba; // Sinhala Ya
39 static const char32 kRayana = 0xdbb; // Sinhala Ra
40};
41
42} // namespace tesseract
43
44#endif // TESSERACT_TRAINING_VALIDATE_INDIC_H_
signed int char32
Definition: unichar.h:51
ValidateIndic(ViramaScript script, bool report_errors)
bool ConsumeGraphemeIfValid() override
Validator::CharClass UnicodeToCharClass(char32 ch) const override
std::pair< CharClass, char32 > IndicPair
Definition: validator.h:133