entryEquality.js
4.55 KB
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var fs = require('fs')
/**
* Compares two entries with identical name and type.
*/
module.exports = {
isEntryEqualSync: function (entry1, entry2, type, options) {
if (type === 'file') {
return isFileEqualSync(entry1, entry2, options)
}
if (type === 'directory') {
return isDirectoryEqual(entry1, entry2, options)
}
if (type === 'broken-link') {
return isBrokenLinkEqual()
}
throw new Error('Unexpected type ' + type)
},
isEntryEqualAsync: function (entry1, entry2, type, diffSet, options) {
if (type === 'file') {
return isFileEqualAsync(entry1, entry2, type, diffSet, options)
}
if (type === 'directory') {
return isDirectoryEqual(entry1, entry2, options)
}
if (type === 'broken-link') {
return isBrokenLinkEqual()
}
throw new Error('Unexpected type ' + type)
}
}
function isFileEqualSync(entry1, entry2, options) {
var p1 = entry1 ? entry1.absolutePath : undefined
var p2 = entry2 ? entry2.absolutePath : undefined
if (options.compareSymlink && !isSymlinkEqual(entry1, entry2)) {
return { same: false, reason: 'different-symlink' }
}
if (options.compareSize && entry1.stat.size !== entry2.stat.size) {
return { same: false, reason: 'different-size' }
}
if (options.compareDate && !isDateEqual(entry1.stat.mtime, entry2.stat.mtime, options.dateTolerance)) {
return { same: false, reason: 'different-date' }
}
if (options.compareContent && !options.compareFileSync(p1, entry1.stat, p2, entry2.stat, options)) {
return { same: false, reason: 'different-content' }
}
return { same: true }
}
function isFileEqualAsync(entry1, entry2, type, diffSet, options) {
var p1 = entry1 ? entry1.absolutePath : undefined
var p2 = entry2 ? entry2.absolutePath : undefined
if (options.compareSymlink && !isSymlinkEqual(entry1, entry2)) {
return { same: false, reason: 'different-symlink' }
}
if (options.compareSize && entry1.stat.size !== entry2.stat.size) {
return { same: false, samePromise: undefined, reason: 'different-size' }
}
if (options.compareDate && !isDateEqual(entry1.stat.mtime, entry2.stat.mtime, options.dateTolerance)) {
return { same: false, samePromise: undefined, reason: 'different-date' }
}
if (options.compareContent) {
var samePromise = undefined
var subDiffSet
if (!options.noDiffSet) {
subDiffSet = []
diffSet.push(subDiffSet)
}
samePromise = options.compareFileAsync(p1, entry1.stat, p2, entry2.stat, options)
.then(function (comparisonResult) {
var same, error
if (typeof (comparisonResult) === "boolean") {
same = comparisonResult
} else {
error = comparisonResult
}
return {
entry1: entry1, entry2: entry2, same: same,
error: error, type1: type, type2: type,
diffSet: subDiffSet,
reason: same ? undefined : 'different-content'
}
})
.catch(function (error) {
return {
error: error
}
})
return { same: undefined, samePromise: samePromise }
}
return { same: true, samePromise: undefined }
}
function isDirectoryEqual(entry1, entry2, options) {
if (options.compareSymlink && !isSymlinkEqual(entry1, entry2)) {
return { same: false, reason: 'different-symlink' }
}
return { same: true }
}
function isBrokenLinkEqual() {
return { same: false, reason: 'broken-link' } // broken links are never considered equal
}
/**
* Compares two dates and returns true/false depending on tolerance (milliseconds).
* Two dates are considered equal if the difference in milliseconds between them is less or equal than tolerance.
*/
function isDateEqual(date1, date2, tolerance) {
return Math.abs(date1.getTime() - date2.getTime()) <= tolerance ? true : false
}
/**
* Compares two entries for symlink equality.
*/
function isSymlinkEqual(entry1, entry2) {
if (!entry1.isSymlink && !entry2.isSymlink) {
return true
}
if (entry1.isSymlink && entry2.isSymlink && hasIdenticalLink(entry1.absolutePath, entry2.absolutePath)) {
return true
}
return false
}
function hasIdenticalLink(path1, path2) {
return fs.readlinkSync(path1) === fs.readlinkSync(path2)
}