62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
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/**
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* @typedef Options
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* Configuration.
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* @property {boolean | null | undefined} [jsx=false]
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* Support JSX identifiers (default: `false`).
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*/
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const startRe = /[$_\p{ID_Start}]/u
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const contRe = /[$_\u{200C}\u{200D}\p{ID_Continue}]/u
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const contReJsx = /[-$_\u{200C}\u{200D}\p{ID_Continue}]/u
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const nameRe = /^[$_\p{ID_Start}][$_\u{200C}\u{200D}\p{ID_Continue}]*$/u
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const nameReJsx = /^[$_\p{ID_Start}][-$_\u{200C}\u{200D}\p{ID_Continue}]*$/u
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/** @type {Options} */
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const emptyOptions = {}
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/**
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* Checks if the given code point can start an identifier.
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*
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* @param {number | undefined} code
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* Code point to check.
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* @returns {boolean}
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* Whether `code` can start an identifier.
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*/
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// Note: `undefined` is supported so you can pass the result from `''.codePointAt`.
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export function start(code) {
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return code ? startRe.test(String.fromCodePoint(code)) : false
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}
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/**
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* Checks if the given code point can continue an identifier.
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*
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* @param {number | undefined} code
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* Code point to check.
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* @param {Options | null | undefined} [options]
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* Configuration (optional).
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* @returns {boolean}
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* Whether `code` can continue an identifier.
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*/
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// Note: `undefined` is supported so you can pass the result from `''.codePointAt`.
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export function cont(code, options) {
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const settings = options || emptyOptions
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const re = settings.jsx ? contReJsx : contRe
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return code ? re.test(String.fromCodePoint(code)) : false
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}
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/**
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* Checks if the given value is a valid identifier name.
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*
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* @param {string} name
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* Identifier to check.
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* @param {Options | null | undefined} [options]
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* Configuration (optional).
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* @returns {boolean}
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* Whether `name` can be an identifier.
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*/
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export function name(name, options) {
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const settings = options || emptyOptions
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const re = settings.jsx ? nameReJsx : nameRe
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return re.test(name)
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}
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