86 lines
2.3 KiB
JavaScript
86 lines
2.3 KiB
JavaScript
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/**
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* @author Toru Nagashima
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* See LICENSE file in root directory for full license.
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*/
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"use strict"
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const path = require("path")
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const resolve = require("resolve")
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/**
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* Resolve the given id to file paths.
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* @param {boolean} isModule The flag which indicates this id is a module.
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* @param {string} id The id to resolve.
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* @param {object} options The options of node-resolve module.
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* It requires `options.basedir`.
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* @returns {string|null} The resolved path.
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*/
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function getFilePath(isModule, id, options) {
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try {
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return resolve.sync(id, options)
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} catch (_err) {
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if (isModule) {
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return null
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}
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return path.resolve(options.basedir, id)
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}
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}
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/**
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* Gets the module name of a given path.
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*
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* e.g. `eslint/lib/ast-utils` -> `eslint`
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*
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* @param {string} nameOrPath - A path to get.
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* @returns {string} The module name of the path.
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*/
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function getModuleName(nameOrPath) {
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let end = nameOrPath.indexOf("/")
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if (end !== -1 && nameOrPath[0] === "@") {
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end = nameOrPath.indexOf("/", 1 + end)
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}
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return end === -1 ? nameOrPath : nameOrPath.slice(0, end)
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}
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/**
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* Information of an import target.
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*/
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module.exports = class ImportTarget {
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/**
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* Initialize this instance.
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* @param {ASTNode} node - The node of a `require()` or a module declaraiton.
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* @param {string} name - The name of an import target.
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* @param {object} options - The options of `node-resolve` module.
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*/
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constructor(node, name, options) {
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const isModule = !/^(?:[./\\]|\w+:)/u.test(name)
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/**
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* The node of a `require()` or a module declaraiton.
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* @type {ASTNode}
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*/
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this.node = node
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/**
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* The name of this import target.
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* @type {string}
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*/
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this.name = name
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/**
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* The full path of this import target.
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* If the target is a module and it does not exist then this is `null`.
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* @type {string|null}
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*/
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this.filePath = getFilePath(isModule, name, options)
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/**
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* The module name of this import target.
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* If the target is a relative path then this is `null`.
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* @type {string|null}
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*/
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this.moduleName = isModule ? getModuleName(name) : null
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}
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}
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