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36 lines
1.3 KiB
C++
36 lines
1.3 KiB
C++
#ifndef TESSERACT_TRAINING_VALIDATE_GRAPHEME_H_
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#define TESSERACT_TRAINING_VALIDATE_GRAPHEME_H_
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#include "validator.h"
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namespace tesseract {
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// Subclass of Validator that validates and segments generic unicode into
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// grapheme clusters, including Latin with diacritics.
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class ValidateGrapheme : public Validator {
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public:
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ValidateGrapheme(ViramaScript script, bool report_errors)
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: Validator(script, report_errors) {}
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~ValidateGrapheme() {}
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protected:
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// Consumes the next Grapheme in codes_[codes_used_++...] and copies it to
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// parts_ and output_. Returns true if a valid Grapheme was consumed,
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// otherwise does not increment codes_used_.
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bool ConsumeGraphemeIfValid() override;
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// Returns the CharClass corresponding to the given Unicode ch.
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CharClass UnicodeToCharClass(char32 ch) const override;
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private:
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// Helper returns true if the sequence prev_ch,ch is invalid.
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bool IsBadlyFormed(char32 prev_ch, char32 ch);
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// Helper returns true if the sequence prev_ch,ch is an invalid Indic vowel.
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static bool IsBadlyFormedIndicVowel(char32 prev_ch, char32 ch);
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// Helper returns true if the sequence prev_ch,ch is invalid Thai.
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static bool IsBadlyFormedThai(char32 prev_ch, char32 ch);
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};
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} // namespace tesseract
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#endif // TESSERACT_TRAINING_VALIDATE_GRAPHEME_H_
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