43 lines
1.9 KiB
JavaScript
43 lines
1.9 KiB
JavaScript
import { safeNormalize, safePush } from '../../utils/globals.js';
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import { mapToConstant } from '../mapToConstant.js';
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import { asciiAlphabetRanges, autonomousDecomposableGraphemeRanges, autonomousGraphemeRanges, fullAlphabetRanges, } from './data/GraphemeRanges.js';
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import { convertGraphemeRangeToMapToConstantEntry, intersectGraphemeRanges } from './helpers/GraphemeRangesHelpers.js';
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const registeredStringUnitInstancesMap = Object.create(null);
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function getAlphabetRanges(alphabet) {
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switch (alphabet) {
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case 'full':
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return fullAlphabetRanges;
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case 'ascii':
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return asciiAlphabetRanges;
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}
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}
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function getOrCreateStringUnitInstance(type, alphabet) {
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const key = `${type}:${alphabet}`;
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const registered = registeredStringUnitInstancesMap[key];
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if (registered !== undefined) {
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return registered;
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}
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const alphabetRanges = getAlphabetRanges(alphabet);
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const ranges = type === 'binary' ? alphabetRanges : intersectGraphemeRanges(alphabetRanges, autonomousGraphemeRanges);
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const entries = [];
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for (const range of ranges) {
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safePush(entries, convertGraphemeRangeToMapToConstantEntry(range));
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}
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if (type === 'grapheme') {
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const decomposedRanges = intersectGraphemeRanges(alphabetRanges, autonomousDecomposableGraphemeRanges);
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for (const range of decomposedRanges) {
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const rawEntry = convertGraphemeRangeToMapToConstantEntry(range);
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safePush(entries, {
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num: rawEntry.num,
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build: (idInGroup) => safeNormalize(rawEntry.build(idInGroup), 'NFD'),
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});
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}
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}
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const stringUnitInstance = mapToConstant(...entries);
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registeredStringUnitInstancesMap[key] = stringUnitInstance;
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return stringUnitInstance;
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}
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export function stringUnit(type, alphabet) {
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return getOrCreateStringUnitInstance(type, alphabet);
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}
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