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/**
* @author Toru Nagashima
* @copyright 2016 Toru Nagashima. All rights reserved.
* See LICENSE file in root directory for full license.
*/
"use strict"
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const path = require("path")
const resolve = require("resolve")
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
/**
* Resolve the given id to file paths.
* @param {boolean} isModule The flag which indicates this id is a module.
* @param {string} id The id to resolve.
* @param {object} options The options of node-resolve module.
* It requires `options.basedir`.
* @returns {string|null} The resolved path.
*/
function getFilePath(isModule, id, options) {
try {
return resolve.sync(id, options)
}
catch (_err) {
if (isModule) {
return null
}
return path.resolve(options.basedir, id)
}
}
/**
* Gets the module name of a given path.
*
* e.g. `eslint/lib/ast-utils` -> `eslint`
*
* @param {string} nameOrPath - A path to get.
* @returns {string} The module name of the path.
*/
function getModuleName(nameOrPath) {
let end = nameOrPath.indexOf("/")
if (end !== -1 && nameOrPath[0] === "@") {
end = nameOrPath.indexOf("/", 1 + end)
}
return end === -1 ? nameOrPath : nameOrPath.slice(0, end)
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* Information of an import target.
*/
module.exports = class ImportTarget {
/**
* Initialize this instance.
* @param {ASTNode} node - The node of a `require()` or a module declaraiton.
* @param {string} name - The name of an import target.
* @param {object} options - The options of `node-resolve` module.
*/
constructor(node, name, options) {
const isModule = !/^(?:[./\\]|\w+:)/.test(name)
/**
* The node of a `require()` or a module declaraiton.
* @type {ASTNode}
*/
this.node = node
/**
* The name of this import target.
* @type {string}
*/
this.name = name
/**
* The full path of this import target.
* If the target is a module and it does not exist then this is `null`.
* @type {string|null}
*/
this.filePath = getFilePath(isModule, name, options)
/**
* The module name of this import target.
* If the target is a relative path then this is `null`.
* @type {string|null}
*/
this.moduleName = isModule ? getModuleName(name) : null
}
}
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