tegwick
c5a5b26797
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31 lines
1.1 KiB
JavaScript
31 lines
1.1 KiB
JavaScript
/**
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* Parses an string that holds encoded codepoint mappings, e.g. for bracket pairs or
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* mirroring characters, as encoded by scripts/generateBidiData.js. Returns an object
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* holding the `map`, and optionally a `reverseMap` if `includeReverse:true`.
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* @param {string} encodedString
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* @param {boolean} includeReverse - true if you want reverseMap in the output
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* @return {{map: Map<number, number>, reverseMap?: Map<number, number>}}
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*/
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export function parseCharacterMap (encodedString, includeReverse) {
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const radix = 36
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let lastCode = 0
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const map = new Map()
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const reverseMap = includeReverse && new Map()
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let prevPair
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encodedString.split(',').forEach(function visit(entry) {
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if (entry.indexOf('+') !== -1) {
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for (let i = +entry; i--;) {
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visit(prevPair)
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}
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} else {
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prevPair = entry
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let [a, b] = entry.split('>')
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a = String.fromCodePoint(lastCode += parseInt(a, radix))
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b = String.fromCodePoint(lastCode += parseInt(b, radix))
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map.set(a, b)
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includeReverse && reverseMap.set(b, a)
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}
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})
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return { map, reverseMap }
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}
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