node/lib/path.js at master · CombatCode/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

var isWindows = process.platform === 'win32';

var util = require('util');

// resolves . and .. elements in a path array with directory names there

// must be no slashes, empty elements, or device names (c:\) in the array

// (so also no leading and trailing slashes - it does not distinguish

// relative and absolute paths)

function normalizeArray(parts, allowAboveRoot) {

// if the path tries to go above the root, `up` ends up > 0

var up = 0;

for (var i = parts.length - 1; i >= 0; i--) {

var last = parts[i];

if (last === '.') {

parts.splice(i, 1);

} else if (last === '..') {

parts.splice(i, 1);

up++;

} else if (up) {

parts.splice(i, 1);

up--;

}

// if the path is allowed to go above the root, restore leading ..s

if (allowAboveRoot) {

for (; up--; up) {

parts.unshift('..');

}

return parts;

}

if (isWindows) {

// Regex to split a windows path into three parts: [*, device, slash,

// tail] windows-only

var splitDeviceRe =

/^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/]+[^\\\/]+)?([\\\/])?([\s\S]*?)$/;

// Regex to split the tail part of the above into [*, dir, basename, ext]

var splitTailRe =

/^([\s\S]*?)((?:\.{1,2}|[^\\\/]+?|)(\.[^.\/\\]*|))(?:[\\\/]*)$/;

// Function to split a filename into [root, dir, basename, ext]

// windows version

var splitPath = function(filename) {

// Separate device+slash from tail

var result = splitDeviceRe.exec(filename),

device = (result[1] || '') + (result[2] || ''),

tail = result[3] || '';

// Split the tail into dir, basename and extension

var result2 = splitTailRe.exec(tail),

dir = result2[1],

basename = result2[2],

ext = result2[3];

return [device, dir, basename, ext];

};

var normalizeUNCRoot = function(device) {

return '\\\\' + device.replace(/^[\\\/]+/, '').replace(/[\\\/]+/g, '\\');

};

// path.resolve([from ...], to)

// windows version

exports.resolve = function() {

var resolvedDevice = '',

resolvedTail = '',

resolvedAbsolute = false;

for (var i = arguments.length - 1; i >= -1; i--) {

var path;

if (i >= 0) {

path = arguments[i];

} else if (!resolvedDevice) {

path = process.cwd();

} else {

// Windows has the concept of drive-specific current working

// directories. If we've resolved a drive letter but not yet an

// absolute path, get cwd for that drive. We're sure the device is not

// an unc path at this points, because unc paths are always absolute.

path = process.env['=' + resolvedDevice];

// Verify that a drive-local cwd was found and that it actually points

// to our drive. If not, default to the drive's root.

if (!path || path.substr(0, 3).toLowerCase() !==

resolvedDevice.toLowerCase() + '\\') {

path = resolvedDevice + '\\';

}

// Skip empty and invalid entries

if (typeof path !== 'string') {

throw new TypeError('Arguments to path.resolve must be strings');

} else if (!path) {

continue;

}

var result = splitDeviceRe.exec(path),

device = result[1] || '',

isUnc = device && device.charAt(1) !== ':',

isAbsolute = exports.isAbsolute(path),

tail = result[3];

if (device &&

resolvedDevice &&

device.toLowerCase() !== resolvedDevice.toLowerCase()) {

// This path points to another device so it is not applicable

continue;

}

if (!resolvedDevice) {

resolvedDevice = device;

}

if (!resolvedAbsolute) {

resolvedTail = tail + '\\' + resolvedTail;

resolvedAbsolute = isAbsolute;

}

if (resolvedDevice && resolvedAbsolute) {

break;

}

// Convert slashes to backslashes when `resolvedDevice` points to an UNC

// root. Also squash multiple slashes into a single one where appropriate.

if (isUnc) {

resolvedDevice = normalizeUNCRoot(resolvedDevice);

}

// At this point the path should be resolved to a full absolute path,

// but handle relative paths to be safe (might happen when process.cwd()

// fails)

// Normalize the tail path

function f(p) {

return !!p;

}

resolvedTail = normalizeArray(resolvedTail.split(/[\\\/]+/).filter(f),

!resolvedAbsolute).join('\\');

return (resolvedDevice + (resolvedAbsolute ? '\\' : '') + resolvedTail) ||

'.';

};

// windows version

exports.normalize = function(path) {

var result = splitDeviceRe.exec(path),

device = result[1] || '',

isUnc = device && device.charAt(1) !== ':',

isAbsolute = exports.isAbsolute(path),

tail = result[3],

trailingSlash = /[\\\/]$/.test(tail);

// If device is a drive letter, we'll normalize to lower case.

if (device && device.charAt(1) === ':') {

device = device[0].toLowerCase() + device.substr(1);

}

// Normalize the tail path

tail = normalizeArray(tail.split(/[\\\/]+/).filter(function(p) {

return !!p;

}), !isAbsolute).join('\\');

if (!tail && !isAbsolute) {

tail = '.';

}

if (tail && trailingSlash) {

tail += '\\';

}

// Convert slashes to backslashes when `device` points to an UNC root.

// Also squash multiple slashes into a single one where appropriate.

if (isUnc) {

device = normalizeUNCRoot(device);

}

return device + (isAbsolute ? '\\' : '') + tail;

};

// windows version

exports.isAbsolute = function(path) {

var result = splitDeviceRe.exec(path),

device = result[1] || '',

isUnc = device && device.charAt(1) !== ':';

// UNC paths are always absolute

return !!result[2] || isUnc;

};

// windows version

exports.join = function() {

function f(p) {

if (typeof p !== 'string') {

throw new TypeError('Arguments to path.join must be strings');

}

return p;

}

var paths = Array.prototype.filter.call(arguments, f);

var joined = paths.join('\\');

// Make sure that the joined path doesn't start with two slashes, because

// normalize() will mistake it for an UNC path then.

// This step is skipped when it is very clear that the user actually

// intended to point at an UNC path. This is assumed when the first

// non-empty string arguments starts with exactly two slashes followed by

// at least one more non-slash character.

// Note that for normalize() to treat a path as an UNC path it needs to

// have at least 2 components, so we don't filter for that here.

// This means that the user can use join to construct UNC paths from

// a server name and a share name; for example:

// path.join('//server', 'share') -> '\\\\server\\share\')

if (!/^[\\\/]{2}[^\\\/]/.test(paths[0])) {

joined = joined.replace(/^[\\\/]{2,}/, '\\');

}

return exports.normalize(joined);

};

// path.relative(from, to)

// it will solve the relative path from 'from' to 'to', for instance:

// from = 'C:\\orandea\\test\\aaa'

// to = 'C:\\orandea\\impl\\bbb'

// The output of the function should be: '..\\..\\impl\\bbb'

// windows version

exports.relative = function(from, to) {

from = exports.resolve(from);

to = exports.resolve(to);

// windows is not case sensitive

var lowerFrom = from.toLowerCase();

var lowerTo = to.toLowerCase();

function trim(arr) {

var start = 0;

for (; start < arr.length; start++) {

if (arr[start] !== '') break;

}

var end = arr.length - 1;

for (; end >= 0; end--) {

if (arr[end] !== '') break;

}

if (start > end) return [];

return arr.slice(start, end - start + 1);

}

var toParts = trim(to.split('\\'));

var lowerFromParts = trim(lowerFrom.split('\\'));

var lowerToParts = trim(lowerTo.split('\\'));

var length = Math.min(lowerFromParts.length, lowerToParts.length);

var samePartsLength = length;

for (var i = 0; i < length; i++) {

if (lowerFromParts[i] !== lowerToParts[i]) {

samePartsLength = i;

break;

}

if (samePartsLength == 0) {

return to;

}

var outputParts = [];

for (var i = samePartsLength; i < lowerFromParts.length; i++) {

outputParts.push('..');

}

outputParts = outputParts.concat(toParts.slice(samePartsLength));

return outputParts.join('\\');

};

exports.sep = '\\';

exports.delimiter = ';';

} else /* posix */ {

// Split a filename into [root, dir, basename, ext], unix version

// 'root' is just a slash, or nothing.

var splitPathRe =

/^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;

var splitPath = function(filename) {

return splitPathRe.exec(filename).slice(1);

};

// path.resolve([from ...], to)

// posix version

exports.resolve = function() {

var resolvedPath = '',

resolvedAbsolute = false;

for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {

var path = (i >= 0) ? arguments[i] : process.cwd();

// Skip empty and invalid entries

if (typeof path !== 'string') {

throw new TypeError('Arguments to path.resolve must be strings');

} else if (!path) {

continue;

}

resolvedPath = path + '/' + resolvedPath;

resolvedAbsolute = path.charAt(0) === '/';

}

// At this point the path should be resolved to a full absolute path, but

// handle relative paths to be safe (might happen when process.cwd() fails)

// Normalize the path

resolvedPath = normalizeArray(resolvedPath.split('/').filter(function(p) {

return !!p;

}), !resolvedAbsolute).join('/');

return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';

};

// path.normalize(path)

// posix version

exports.normalize = function(path) {

var isAbsolute = exports.isAbsolute(path),

trailingSlash = path.substr(-1) === '/';

// Normalize the path

path = normalizeArray(path.split('/').filter(function(p) {

return !!p;

}), !isAbsolute).join('/');

if (!path && !isAbsolute) {

path = '.';

}

if (path && trailingSlash) {

path += '/';

}

return (isAbsolute ? '/' : '') + path;

};

// posix version

exports.isAbsolute = function(path) {

return path.charAt(0) === '/';

};

// posix version

exports.join = function() {

var paths = Array.prototype.slice.call(arguments, 0);

return exports.normalize(paths.filter(function(p, index) {

if (typeof p !== 'string') {

throw new TypeError('Arguments to path.join must be strings');

}

return p;

}).join('/'));

};

// path.relative(from, to)

// posix version

exports.relative = function(from, to) {

from = exports.resolve(from).substr(1);

to = exports.resolve(to).substr(1);

function trim(arr) {

var start = 0;

for (; start < arr.length; start++) {

if (arr[start] !== '') break;

}

var end = arr.length - 1;

for (; end >= 0; end--) {

if (arr[end] !== '') break;

}

if (start > end) return [];

return arr.slice(start, end - start + 1);

}

var fromParts = trim(from.split('/'));

var toParts = trim(to.split('/'));

var length = Math.min(fromParts.length, toParts.length);

var samePartsLength = length;

for (var i = 0; i < length; i++) {

if (fromParts[i] !== toParts[i]) {

samePartsLength = i;

break;

}

var outputParts = [];

for (var i = samePartsLength; i < fromParts.length; i++) {

outputParts.push('..');

}

outputParts = outputParts.concat(toParts.slice(samePartsLength));

return outputParts.join('/');

};

exports.sep = '/';

exports.delimiter = ':';

}

exports.dirname = function(path) {

var result = splitPath(path),

root = result[0],

dir = result[1];

if (!root && !dir) {

// No dirname whatsoever

return '.';

}

if (dir) {

// It has a dirname, strip trailing slash

dir = dir.substr(0, dir.length - 1);

}

return root + dir;

};

exports.basename = function(path, ext) {

var f = splitPath(path)[2];

// TODO: make this comparison case-insensitive on windows?

if (ext && f.substr(-1 * ext.length) === ext) {

f = f.substr(0, f.length - ext.length);

}

return f;

};

exports.extname = function(path) {

return splitPath(path)[3];

};

exports.exists = util.deprecate(function(path, callback) {

require('fs').exists(path, callback);

}, 'path.exists is now called `fs.exists`.');

exports.existsSync = util.deprecate(function(path) {

return require('fs').existsSync(path);

}, 'path.existsSync is now called `fs.existsSync`.');

if (isWindows) {

exports._makeLong = function(path) {

// Note: this will *probably* throw somewhere.

if (typeof path !== 'string')

return path;

if (!path) {

return '';

}

var resolvedPath = exports.resolve(path);

if (/^[a-zA-Z]\:\\/.test(resolvedPath)) {

// path is local filesystem path, which needs to be converted

// to long UNC path.

return '\\\\?\\' + resolvedPath;

} else if (/^\\\\[^?.]/.test(resolvedPath)) {

// path is network UNC path, which needs to be converted

// to long UNC path.

return '\\\\?\\UNC\\' + resolvedPath.substring(2);

}

return path;

};

} else {

exports._makeLong = function(path) {

return path;

};

}

node/lib/path.js at master · CombatCode/node · GitHub

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