91 lines
2.2 KiB
JavaScript
91 lines
2.2 KiB
JavaScript
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/**
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* @typedef CoreOptions
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* @property {Array<string>} [subset=[]]
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* Whether to only escape the given subset of characters.
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* @property {boolean} [escapeOnly=false]
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* Whether to only escape possibly dangerous characters.
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* Those characters are `"`, `&`, `'`, `<`, `>`, and `` ` ``.
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*
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* @typedef FormatOptions
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* @property {(code: number, next: number, options: CoreWithFormatOptions) => string} format
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* Format strategy.
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*
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* @typedef {CoreOptions & FormatOptions & import('./util/format-smart.js').FormatSmartOptions} CoreWithFormatOptions
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*/
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/**
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* Encode certain characters in `value`.
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*
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* @param {string} value
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* @param {CoreWithFormatOptions} options
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* @returns {string}
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*/
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export function core(value, options) {
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value = value.replace(
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options.subset ? charactersToExpression(options.subset) : /["&'<>`]/g,
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basic
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)
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if (options.subset || options.escapeOnly) {
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return value
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}
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return (
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value
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// Surrogate pairs.
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.replace(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g, surrogate)
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// BMP control characters (C0 except for LF, CR, SP; DEL; and some more
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// non-ASCII ones).
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.replace(
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// eslint-disable-next-line no-control-regex, unicorn/no-hex-escape
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/[\x01-\t\v\f\x0E-\x1F\x7F\x81\x8D\x8F\x90\x9D\xA0-\uFFFF]/g,
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basic
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)
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)
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/**
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* @param {string} pair
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* @param {number} index
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* @param {string} all
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*/
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function surrogate(pair, index, all) {
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return options.format(
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(pair.charCodeAt(0) - 0xd800) * 0x400 +
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pair.charCodeAt(1) -
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0xdc00 +
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0x10000,
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all.charCodeAt(index + 2),
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options
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)
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}
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/**
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* @param {string} character
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* @param {number} index
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* @param {string} all
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*/
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function basic(character, index, all) {
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return options.format(
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character.charCodeAt(0),
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all.charCodeAt(index + 1),
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options
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)
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}
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}
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/**
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* @param {Array<string>} subset
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* @returns {RegExp}
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*/
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function charactersToExpression(subset) {
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/** @type {Array<string>} */
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const groups = []
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let index = -1
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while (++index < subset.length) {
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groups.push(subset[index].replace(/[|\\{}()[\]^$+*?.]/g, '\\$&'))
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}
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return new RegExp('(?:' + groups.join('|') + ')', 'g')
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}
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