mirror of
https://github.com/nodejs/node.git
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440 lines
12 KiB
JavaScript
440 lines
12 KiB
JavaScript
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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var isWindows = process.platform === 'win32';
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// resolves . and .. elements in a path array with directory names there
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// must be no slashes, empty elements, or device names (c:\) in the array
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// (so also no leading and trailing slashes - it does not distinguish
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// relative and absolute paths)
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function normalizeArray(parts, allowAboveRoot) {
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// if the path tries to go above the root, `up` ends up > 0
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var up = 0;
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for (var i = parts.length - 1; i >= 0; i--) {
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var last = parts[i];
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if (last == '.') {
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parts.splice(i, 1);
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} else if (last === '..') {
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parts.splice(i, 1);
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up++;
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} else if (up) {
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parts.splice(i, 1);
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up--;
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}
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}
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// if the path is allowed to go above the root, restore leading ..s
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if (allowAboveRoot) {
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for (; up--; up) {
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parts.unshift('..');
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}
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}
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return parts;
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}
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if (isWindows) {
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// Regex to split a windows path into three parts: [*, device, slash,
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// tail] windows-only
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var splitDeviceRe =
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/^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/][^\\\/]+)?([\\\/])?([\s\S]*?)$/;
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// Regex to split the tail part of the above into [*, dir, basename, ext]
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var splitTailRe = /^([\s\S]+[\\\/](?!$)|[\\\/])?((?:\.{1,2}$|[\s\S]+?)?(\.[^.\/\\]*)?)$/;
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// Function to split a filename into [root, dir, basename, ext]
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// windows version
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var splitPath = function(filename) {
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// Separate device+slash from tail
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var result = splitDeviceRe.exec(filename),
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device = (result[1] || '') + (result[2] || ''),
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tail = result[3] || '';
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// Split the tail into dir, basename and extension
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var result2 = splitTailRe.exec(tail),
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dir = result2[1] || '',
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basename = result2[2] || '',
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ext = result2[3] || '';
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return [device, dir, basename, ext];
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};
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// path.resolve([from ...], to)
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// windows version
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exports.resolve = function() {
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var resolvedDevice = '',
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resolvedTail = '',
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resolvedAbsolute = false;
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for (var i = arguments.length - 1; i >= -1; i--) {
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var path;
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if (i >= 0) {
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path = arguments[i];
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} else if (!resolvedDevice) {
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path = process.cwd();
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} else {
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// Windows has the concept of drive-specific current working
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// directories. If we've resolved a drive letter but not yet an
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// absolute path, get cwd for that drive. We're sure the device is not
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// an unc path at this points, because unc paths are always absolute.
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path = process._cwdForDrive(resolvedDevice[0]);
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}
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// Skip empty and invalid entries
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if (typeof path !== 'string' || !path) {
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continue;
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}
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var result = splitDeviceRe.exec(path),
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device = result[1] || '',
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isUnc = device && device.charAt(1) !== ':',
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isAbsolute = !!result[2] || isUnc, // UNC paths are always absolute
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tail = result[3];
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if (device &&
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resolvedDevice &&
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device.toLowerCase() !== resolvedDevice.toLowerCase()) {
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// This path points to another device so it is not applicable
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continue;
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}
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if (!resolvedDevice) {
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resolvedDevice = device;
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}
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if (!resolvedAbsolute) {
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resolvedTail = tail + '\\' + resolvedTail;
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resolvedAbsolute = isAbsolute;
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}
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if (resolvedDevice && resolvedAbsolute) {
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break;
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}
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}
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// Replace slashes (in UNC share name) by backslashes
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resolvedDevice = resolvedDevice.replace(/\//g, '\\');
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// At this point the path should be resolved to a full absolute path,
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// but handle relative paths to be safe (might happen when process.cwd()
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// fails)
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// Normalize the tail path
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function f(p) {
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return !!p;
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}
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resolvedTail = normalizeArray(resolvedTail.split(/[\\\/]+/).filter(f),
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!resolvedAbsolute).join('\\');
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return (resolvedDevice + (resolvedAbsolute ? '\\' : '') + resolvedTail) ||
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'.';
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};
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// windows version
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exports.normalize = function(path) {
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var result = splitDeviceRe.exec(path),
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device = result[1] || '',
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isUnc = device && device.charAt(1) !== ':',
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isAbsolute = !!result[2] || isUnc, // UNC paths are always absolute
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tail = result[3],
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trailingSlash = /[\\\/]$/.test(tail);
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// Normalize the tail path
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tail = normalizeArray(tail.split(/[\\\/]+/).filter(function(p) {
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return !!p;
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}), !isAbsolute).join('\\');
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if (!tail && !isAbsolute) {
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tail = '.';
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}
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if (tail && trailingSlash) {
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tail += '\\';
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}
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return device + (isAbsolute ? '\\' : '') + tail;
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};
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// windows version
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exports.join = function() {
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function f(p) {
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return p && typeof p === 'string';
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}
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var paths = Array.prototype.slice.call(arguments, 0).filter(f);
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var joined = paths.join('\\');
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// Make sure that the joined path doesn't start with two slashes
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// - it will be mistaken for an unc path by normalize() -
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// unless the paths[0] also starts with two slashes
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if (/^[\\\/]{2}/.test(joined) && !/^[\\\/]{2}/.test(paths[0])) {
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joined = joined.slice(1);
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}
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return exports.normalize(joined);
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};
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// path.relative(from, to)
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// it will solve the relative path from 'from' to 'to', for instance:
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// from = 'C:\\orandea\\test\\aaa'
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// to = 'C:\\orandea\\impl\\bbb'
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// The output of the function should be: '..\\..\\impl\\bbb'
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// windows version
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exports.relative = function(from, to) {
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from = exports.resolve(from);
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to = exports.resolve(to);
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// windows is not case sensitive
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var lowerFrom = from.toLowerCase();
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var lowerTo = to.toLowerCase();
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function trim(arr) {
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var start = 0;
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for (; start < arr.length; start++) {
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if (arr[start] !== '') break;
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}
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var end = arr.length - 1;
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for (; end >= 0; end--) {
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if (arr[end] !== '') break;
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}
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if (start > end) return [];
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return arr.slice(start, end - start + 1);
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}
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var toParts = trim(to.split('\\'));
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var lowerFromParts = trim(lowerFrom.split('\\'));
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var lowerToParts = trim(lowerTo.split('\\'));
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var length = Math.min(lowerFromParts.length, lowerToParts.length);
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var samePartsLength = length;
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for (var i = 0; i < length; i++) {
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if (lowerFromParts[i] !== lowerToParts[i]) {
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samePartsLength = i;
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break;
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}
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}
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if (samePartsLength == 0) {
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return to;
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}
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var outputParts = [];
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for (var i = samePartsLength; i < lowerFromParts.length; i++) {
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outputParts.push('..');
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}
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outputParts = outputParts.concat(toParts.slice(samePartsLength));
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return outputParts.join('\\');
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};
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} else /* posix */ {
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// Split a filename into [root, dir, basename, ext], unix version
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// 'root' is just a slash, or nothing.
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var splitPathRe = /^(\/?)([\s\S]+\/(?!$)|\/)?((?:\.{1,2}$|[\s\S]+?)?(\.[^.\/]*)?)$/;
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var splitPath = function(filename) {
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var result = splitPathRe.exec(filename);
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return [result[1] || '', result[2] || '', result[3] || '', result[4] || ''];
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};
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// path.resolve([from ...], to)
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// posix version
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exports.resolve = function() {
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var resolvedPath = '',
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resolvedAbsolute = false;
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for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
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var path = (i >= 0) ? arguments[i] : process.cwd();
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// Skip empty and invalid entries
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if (typeof path !== 'string' || !path) {
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continue;
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}
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resolvedPath = path + '/' + resolvedPath;
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resolvedAbsolute = path.charAt(0) === '/';
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}
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// At this point the path should be resolved to a full absolute path, but
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// handle relative paths to be safe (might happen when process.cwd() fails)
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// Normalize the path
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resolvedPath = normalizeArray(resolvedPath.split('/').filter(function(p) {
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return !!p;
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}), !resolvedAbsolute).join('/');
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return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
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};
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// path.normalize(path)
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// posix version
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exports.normalize = function(path) {
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var isAbsolute = path.charAt(0) === '/',
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trailingSlash = path.slice(-1) === '/';
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// Normalize the path
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path = normalizeArray(path.split('/').filter(function(p) {
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return !!p;
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}), !isAbsolute).join('/');
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if (!path && !isAbsolute) {
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path = '.';
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}
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if (path && trailingSlash) {
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path += '/';
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}
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return (isAbsolute ? '/' : '') + path;
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};
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// posix version
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exports.join = function() {
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var paths = Array.prototype.slice.call(arguments, 0);
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return exports.normalize(paths.filter(function(p, index) {
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return p && typeof p === 'string';
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}).join('/'));
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};
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// path.relative(from, to)
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// posix version
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exports.relative = function(from, to) {
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from = exports.resolve(from).substr(1);
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to = exports.resolve(to).substr(1);
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function trim(arr) {
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var start = 0;
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for (; start < arr.length; start++) {
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if (arr[start] !== '') break;
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}
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var end = arr.length - 1;
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for (; end >= 0; end--) {
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if (arr[end] !== '') break;
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}
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if (start > end) return [];
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return arr.slice(start, end - start + 1);
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}
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var fromParts = trim(from.split('/'));
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var toParts = trim(to.split('/'));
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var length = Math.min(fromParts.length, toParts.length);
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var samePartsLength = length;
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for (var i = 0; i < length; i++) {
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if (fromParts[i] !== toParts[i]) {
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samePartsLength = i;
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break;
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}
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}
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var outputParts = [];
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for (var i = samePartsLength; i < fromParts.length; i++) {
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outputParts.push('..');
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}
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outputParts = outputParts.concat(toParts.slice(samePartsLength));
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return outputParts.join('/');
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};
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}
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exports.dirname = function(path) {
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var result = splitPath(path),
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root = result[0],
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dir = result[1];
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if (!root && !dir) {
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// No dirname whatsoever
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return '.';
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}
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if (dir) {
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// It has a dirname, strip trailing slash
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dir = dir.substring(0, dir.length - 1);
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}
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return root + dir;
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};
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exports.basename = function(path, ext) {
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var f = splitPath(path)[2];
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// TODO: make this comparison case-insensitive on windows?
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if (ext && f.substr(-1 * ext.length) === ext) {
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f = f.substr(0, f.length - ext.length);
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}
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return f;
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};
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exports.extname = function(path) {
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return splitPath(path)[3];
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};
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exports.exists = function(path, callback) {
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process.binding('fs').stat(path, function(err, stats) {
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if (callback) callback(err ? false : true);
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});
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};
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exports.existsSync = function(path) {
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try {
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process.binding('fs').stat(path);
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return true;
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} catch (e) {
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return false;
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}
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};
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exports._makeLong = isWindows ?
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function(path) {
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var resolvedPath = exports.resolve(path);
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if (resolvedPath.match(/^[a-zA-Z]\:\\/)) {
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// path is local filesystem path, which needs to be converted
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// to long UNC path.
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return '\\\\?\\' + resolvedPath;
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} else if (resolvedPath.match(/^\\\\[^?.]/)) {
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// path is network UNC path, which needs to be converted
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// to long UNC path.
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return '\\\\?\\UNC\\' + resolvedPath.substring(2);
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}
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return path;
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} :
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function(path) {
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return path;
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};
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