64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
#include "range_based_case_converter.hpp"
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uint32_t RangeBasedCaseConverter::convert(uint32_t code_point) const {
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const CaseConversionRecord* conversionRecord = findRecord_(code_point);
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return
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conversionRecord == 0
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? code_point
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: applyRecord_(conversionRecord, code_point);
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}
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const CaseConversionRecord* RangeBasedCaseConverter::findRecord_(uint32_t code_point) const {
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for (size_t i = 0; i < tableSize_; ++i) {
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const CaseConversionRecord* currentRecord = &conversionTable_[i];
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if (code_point < currentRecord->lo_code_point)
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return 0;
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if (code_point <= currentRecord->hi_code_point)
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return currentRecord;
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}
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return 0;
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}
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uint32_t RangeBasedCaseConverter::applyRecord_(
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const CaseConversionRecord* conversionRecord, uint32_t code_point) const {
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if (shouldBeSkipped_(conversionRecord, code_point))
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return code_point;
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return applyDelta_(conversionRecord->delta, code_point);
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}
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bool RangeBasedCaseConverter::shouldBeSkipped_(
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const CaseConversionRecord* conversionRecord, uint32_t code_point) const {
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return
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isSkipRecord_(conversionRecord)
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&& code_point % 2 != conversionRecord->lo_code_point % 2;
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}
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bool RangeBasedCaseConverter::isSkipRecord_(const CaseConversionRecord* conversionRecord) const {
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return
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conversionRecord->delta == EVEN_ODD_SKIP
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|| conversionRecord->delta == ODD_EVEN_SKIP;
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}
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uint32_t RangeBasedCaseConverter::applyDelta_(int32_t delta, uint32_t code_point) const {
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switch (delta) {
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case EVEN_ODD:
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case EVEN_ODD_SKIP:
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return code_point % 2 == 0 ? code_point+1 : code_point-1;
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case ODD_EVEN:
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case ODD_EVEN_SKIP:
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return code_point % 2 == 1 ? code_point+1 : code_point-1;
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default:
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return code_point + delta;
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}
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}
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