ce4c83ff
 wxy
初始提交
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/**
* @author Toru Nagashima
* @copyright 2015 Toru Nagashima. All rights reserved.
* See LICENSE file in root directory for full license.
*/
"use strict"
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const fs = require("fs")
const path = require("path")
const Cache = require("./cache")
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const ROOT = /^(?:[/.]|\.\.|[A-Z]:\\|\\\\)(?:[/\\]\.\.)*$/
const cache = new Cache()
/**
* Check whether the file exists or not.
* @param {string} filePath The file path to check.
* @returns {boolean} `true` if the file exists.
*/
function existsCaseSensitive(filePath) {
let dirPath = filePath
while (dirPath !== "" && !ROOT.test(dirPath)) {
const fileName = path.basename(dirPath)
dirPath = path.dirname(dirPath)
if (fs.readdirSync(dirPath).indexOf(fileName) === -1) {
return false
}
}
return true
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* Checks whether or not the file of a given path exists.
*
* @param {string} filePath - A file path to check.
* @returns {boolean} `true` if the file of a given path exists.
*/
module.exports = function exists(filePath) {
let result = cache.get(filePath)
if (result == null) {
try {
const relativePath = path.relative(process.cwd(), filePath)
result = (
fs.statSync(relativePath).isFile() &&
existsCaseSensitive(relativePath)
)
}
catch (error) {
if (error.code !== "ENOENT") {
throw error
}
result = false
}
cache.set(filePath, result)
}
return result
}
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