66 lines
1.6 KiB
Plaintext
66 lines
1.6 KiB
Plaintext
/**
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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 fs = require("fs")
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const path = require("path")
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const Cache = require("./cache")
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const ROOT = /^(?:[/.]|\.\.|[A-Z]:\\|\\\\)(?:[/\\]\.\.)*$/u
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const cache = new Cache()
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/**
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* Check whether the file exists or not.
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* @param {string} filePath The file path to check.
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* @returns {boolean} `true` if the file exists.
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*/
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function existsCaseSensitive(filePath) {
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let dirPath = filePath
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while (dirPath !== "" && !ROOT.test(dirPath)) {
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const fileName = path.basename(dirPath)
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dirPath = path.dirname(dirPath)
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if (fs.readdirSync(dirPath).indexOf(fileName) === -1) {
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return false
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}
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}
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return true
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}
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/**
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* Checks whether or not the file of a given path exists.
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*
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* @param {string} filePath - A file path to check.
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* @returns {boolean} `true` if the file of a given path exists.
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*/
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module.exports = function exists(filePath) {
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if (filePath == null) {
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return false
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}
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let result = cache.get(filePath)
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if (result == null) {
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try {
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const relativePath = path.relative(process.cwd(), filePath)
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result =
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fs.statSync(relativePath).isFile() &&
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existsCaseSensitive(relativePath)
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} catch (error) {
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if (
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error instanceof Error &&
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("code" in error === false || error.code !== "ENOENT")
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) {
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throw error
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}
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result = false
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}
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cache.set(filePath, result)
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}
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return result
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}
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