109 lines
3 KiB
JavaScript
109 lines
3 KiB
JavaScript
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/**
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* @typedef {import('estree-jsx').Identifier} Identifier
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* @typedef {import('estree-jsx').JSXIdentifier} JSXIdentifier
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* @typedef {import('estree-jsx').JSXMemberExpression} JSXMemberExpression
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* @typedef {import('estree-jsx').Literal} Literal
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* @typedef {import('estree-jsx').MemberExpression} MemberExpression
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*/
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import {
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start as esStart,
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cont as esCont,
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name as isIdentifierName
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} from 'estree-util-is-identifier-name'
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export const toIdOrMemberExpression = toIdOrMemberExpressionFactory(
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'Identifier',
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'MemberExpression',
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isIdentifierName
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)
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export const toJsxIdOrMemberExpression =
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// @ts-expect-error: fine
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/** @type {(ids: Array<string | number>) => JSXIdentifier | JSXMemberExpression)} */
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(
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toIdOrMemberExpressionFactory(
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'JSXIdentifier',
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'JSXMemberExpression',
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isJsxIdentifierName
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)
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)
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/**
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* @param {string} idType
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* @param {string} memberType
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* @param {(value: string) => boolean} isIdentifier
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*/
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function toIdOrMemberExpressionFactory(idType, memberType, isIdentifier) {
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return toIdOrMemberExpression
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/**
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* @param {Array<string | number>} ids
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* @returns {Identifier | MemberExpression}
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*/
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function toIdOrMemberExpression(ids) {
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let index = -1
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/** @type {Identifier | Literal | MemberExpression | undefined} */
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let object
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while (++index < ids.length) {
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const name = ids[index]
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const valid = typeof name === 'string' && isIdentifier(name)
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// A value of `asd.123` could be turned into `asd['123']` in the JS form,
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// but JSX does not have a form for it, so throw.
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/* c8 ignore next 3 */
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if (idType === 'JSXIdentifier' && !valid) {
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throw new Error('Cannot turn `' + name + '` into a JSX identifier')
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}
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/** @type {Identifier | Literal} */
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// @ts-expect-error: JSX is fine.
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const id = valid ? {type: idType, name} : {type: 'Literal', value: name}
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// @ts-expect-error: JSX is fine.
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object = object
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? {
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type: memberType,
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object,
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property: id,
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computed: id.type === 'Literal',
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optional: false
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}
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: id
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}
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// Just for types.
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/* c8 ignore next 3 */
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if (!object) throw new Error('Expected non-empty `ids` to be passed')
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if (object.type === 'Literal')
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throw new Error('Expected identifier as left-most value')
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return object
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}
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}
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/**
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* Checks if the given string is a valid JSX identifier name.
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* @param {string} name
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*/
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function isJsxIdentifierName(name) {
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let index = -1
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while (++index < name.length) {
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// We currently receive valid input, but this catches bugs and is needed
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// when externalized.
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/* c8 ignore next */
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if (!(index ? jsxCont : esStart)(name.charCodeAt(index))) return false
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}
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// `false` if `name` is empty.
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return index > 0
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}
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/**
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* Checks if the given character code can continue a JSX identifier.
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* @param {number} code
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*/
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function jsxCont(code) {
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return code === 45 /* `-` */ || esCont(code)
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}
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