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Initial COmmit to add Aksara Jawa - Javanese script
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /********************************************************************** | ||
| * File: validate_javanese.cpp | ||
| * Description: Text validator for Javanese Script - aksara jawa. | ||
| * Author: Shree Devi Kumar | ||
| * Created: August 03, 2018 | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| **********************************************************************/ | ||
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| #include "validate_javanese.h" | ||
| #include "errcode.h" | ||
| #include "tprintf.h" | ||
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| namespace tesseract { | ||
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| // Returns whether codes matches the pattern for a Javanese Grapheme. | ||
| // Taken from unicode standard: | ||
| // http://www.unicode.org/charts/PDF/UA980.pdf | ||
| // http://www.unicode.org/versions/Unicode11.0.0/ch17.pdf | ||
| // Also the Consonant class here includes independent vowels, as they are | ||
| // treated the same anyway. | ||
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| bool ValidateJavanese::ConsumeGraphemeIfValid() { | ||
| int num_codes = codes_.size(); | ||
| if (codes_used_ == num_codes) return false; | ||
| if (codes_[codes_used_].first == CharClass::kOther) { | ||
| UseMultiCode(1); | ||
| return true; | ||
| } | ||
| if (codes_[codes_used_].first != CharClass::kConsonant) { | ||
| if (report_errors_) { | ||
| tprintf("Invalid start of Javanese syllable:0x%x\n", | ||
| codes_[codes_used_].second); | ||
| } | ||
| return false; | ||
| } | ||
| if (UseMultiCode(1)) return true; | ||
| if ( codes_[codes_used_].first == CharClass::kNukta) { | ||
| if (UseMultiCode(1)) return true; | ||
| } | ||
| while (codes_used_ + 1 < num_codes && | ||
| codes_[codes_used_].first == CharClass::kVirama && | ||
| codes_[codes_used_ + 1].first == CharClass::kConsonant) { | ||
| ASSERT_HOST(!CodeOnlyToOutput()); | ||
| if (UseMultiCode(2)) return true; | ||
| if (codes_[codes_used_].first == CharClass::kRobat) { | ||
| if (UseMultiCode(1)) return true; | ||
| } | ||
| } | ||
| int num_matra_parts = 0; | ||
| if (codes_[codes_used_].second == kZeroWidthJoiner || | ||
| codes_[codes_used_].second == kZeroWidthNonJoiner) { | ||
| if (CodeOnlyToOutput()) { | ||
| if (report_errors_) { | ||
| tprintf("Unterminated joiner: 0x%x\n", output_.back()); | ||
| } | ||
| return false; | ||
| } | ||
| ++num_matra_parts; | ||
| } | ||
| // Not quite as shown by the BNF, the matra piece is allowed as a matra on its | ||
| // own or as an addition to other matras. | ||
| if (codes_[codes_used_].first == CharClass::kMatra) { | ||
| ++num_matra_parts; | ||
| if (UseMultiCode(num_matra_parts)) return true; | ||
| } else if (num_matra_parts) { | ||
| if (report_errors_) { | ||
| tprintf("Joiner with non-dependent vowel after it!:0x%x 0x%x\n", | ||
| output_.back(), codes_[codes_used_].second); | ||
| } | ||
| return false; | ||
| } | ||
| if (codes_[codes_used_].first == CharClass::kMatraPiece && | ||
| codes_[codes_used_ - 1].first != CharClass::kMatraPiece) { | ||
| if (UseMultiCode(1)) return true; | ||
| } | ||
| if (codes_[codes_used_].first == CharClass::kVowelModifier) { | ||
| if (UseMultiCode(1)) return true; | ||
| } | ||
| if (codes_used_ + 1 < num_codes && | ||
| codes_[codes_used_].first == CharClass::kVirama && | ||
| codes_[codes_used_ + 1].first == CharClass::kConsonant) { | ||
| ASSERT_HOST(!CodeOnlyToOutput()); | ||
| if (UseMultiCode(2)) return true; | ||
| } | ||
| return true; | ||
| } | ||
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| Validator::CharClass ValidateJavanese::UnicodeToCharClass(char32 ch) const { | ||
| if (IsVedicAccent(ch)) return CharClass::kVedicMark; | ||
| if (ch == kZeroWidthNonJoiner) return CharClass::kZeroWidthNonJoiner; | ||
| if (ch == kZeroWidthJoiner) return CharClass::kZeroWidthJoiner; | ||
| // Offset from the start of the relevant unicode code block aka code page. | ||
| int off = ch - static_cast<char32>(script_); | ||
| // Anything in another code block is other. | ||
| if (off < 0 || off >= kIndicCodePageSize) return CharClass::kOther; | ||
| if (off < 0x4) return CharClass::kVowelModifier; | ||
| if (off <= 0x32) return CharClass::kConsonant; // includes independent vowels | ||
| if (off == 0x33) return CharClass::kNukta; // A9B3 CECAK TELU | ||
| if (off == 0x34) return CharClass::kVowelModifier; // A9B4 TARUNG | ||
| if (off <= 0x3d) return CharClass::kMatra; | ||
| if (off <= 0x3f) return CharClass::kVowelModifier; // A9BE-A9BF PENGKAL-CAKRA | ||
| if (off == 0x40) return CharClass::kVirama; // A9C0 PANGKON | ||
| return CharClass::kOther; | ||
| } | ||
|
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||
| } // namespace tesseract |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /********************************************************************** | ||
| * File: validate_javanese.h | ||
| * Description: Text validator for Javanese Script - aksara jawa. | ||
| * Author: Shree Devi Kumar | ||
| * Created: August 03, 2018 | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| **********************************************************************/ | ||
|
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| #ifndef TESSERACT_TRAINING_VALIDATE_JAVANESE_H_ | ||
| #define TESSERACT_TRAINING_VALIDATE_JAVANESE_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 Javanese. | ||
| class ValidateJavanese : public Validator { | ||
| public: | ||
| ValidateJavanese(ViramaScript script, bool report_errors) | ||
| : Validator(script, report_errors) {} | ||
| ~ValidateJavanese() {} | ||
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| protected: | ||
| // Returns whether codes matches the pattern for an Javanese Grapheme. | ||
| // Consumes the next Grapheme in codes_[codes_used_++...] and copies it to | ||
| // parts_ and output_. Returns true if a valid Grapheme was consumed, | ||
| // otherwise does not increment codes_used_. | ||
| bool ConsumeGraphemeIfValid() override; | ||
| // Returns the CharClass corresponding to the given Unicode ch. | ||
| CharClass UnicodeToCharClass(char32 ch) const override; | ||
| }; | ||
|
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| } // namespace tesseract | ||
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| #endif // TESSERACT_TRAINING_VALIDATE_JAVANESE_H_ |
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