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// Copyright 2010 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Utilities for dealing with POSIX path strings. Based on
* Python's os.path and posixpath.
* @author nnaze@google.com (Nathan Naze)
*/
goog.provide('goog.string.path');
goog.require('goog.array');
goog.require('goog.string');
/**
* Returns the final component of a pathname.
* See http://docs.python.org/library/os.path.html#os.path.basename
* @param {string} path A pathname.
* @return {string} path The final component of a pathname, i.e. everything
* after the final slash.
*/
goog.string.path.baseName = function(path) {
var i = path.lastIndexOf('/') + 1;
return path.slice(i);
};
/**
* Alias to goog.string.path.baseName.
* @param {string} path A pathname.
* @return {string} path The final component of a pathname.
* @deprecated Use goog.string.path.baseName.
*/
goog.string.path.basename = goog.string.path.baseName;
/**
* Returns the directory component of a pathname.
* See http://docs.python.org/library/os.path.html#os.path.dirname
* @param {string} path A pathname.
* @return {string} The directory component of a pathname, i.e. everything
* leading up to the final slash.
*/
goog.string.path.dirname = function(path) {
var i = path.lastIndexOf('/') + 1;
var head = path.slice(0, i);
// If the path isn't all forward slashes, trim the trailing slashes.
if (!/^\/+$/.test(head)) {
head = head.replace(/\/+$/, '');
}
return head;
};
/**
* Extracts the extension part of a pathname.
* @param {string} path The path name to process.
* @return {string} The extension if any, otherwise the empty string.
*/
goog.string.path.extension = function(path) {
var separator = '.';
// Combining all adjacent periods in the basename to a single period.
var baseName = goog.string.path.baseName(path).replace(/\.+/g, separator);
var separatorIndex = baseName.lastIndexOf(separator);
return separatorIndex <= 0 ? '' : baseName.substr(separatorIndex + 1);
};
/**
* Joins one or more path components (e.g. 'foo/' and 'bar' make 'foo/bar').
* An absolute component will discard all previous component.
* See http://docs.python.org/library/os.path.html#os.path.join
* @param {...string} var_args One of more path components.
* @return {string} The path components joined.
*/
goog.string.path.join = function(var_args) {
var path = arguments[0];
for (var i = 1; i < arguments.length; i++) {
var arg = arguments[i];
if (goog.string.startsWith(arg, '/')) {
path = arg;
} else if (path == '' || goog.string.endsWith(path, '/')) {
path += arg;
} else {
path += '/' + arg;
}
}
return path;
};
/**
* Normalizes a pathname by collapsing duplicate separators, parent directory
* references ('..'), and current directory references ('.').
* See http://docs.python.org/library/os.path.html#os.path.normpath
* @param {string} path One or more path components.
* @return {string} The path after normalization.
*/
goog.string.path.normalizePath = function(path) {
if (path == '') {
return '.';
}
var initialSlashes = '';
// POSIX will keep two slashes, but three or more will be collapsed to one.
if (goog.string.startsWith(path, '/')) {
initialSlashes = '/';
if (goog.string.startsWith(path, '//') &&
!goog.string.startsWith(path, '///')) {
initialSlashes = '//';
}
}
var parts = path.split('/');
var newParts = [];
for (var i = 0; i < parts.length; i++) {
var part = parts[i];
// '' and '.' don't change the directory, ignore.
if (part == '' || part == '.') {
continue;
}
// A '..' should pop a directory unless this is not an absolute path and
// we're at the root, or we've travelled upwards relatively in the last
// iteration.
if (part != '..' || (!initialSlashes && !newParts.length) ||
goog.array.peek(newParts) == '..') {
newParts.push(part);
} else {
newParts.pop();
}
}
var returnPath = initialSlashes + newParts.join('/');
return returnPath || '.';
};
/**
* Splits a pathname into "dirname" and "baseName" components, where "baseName"
* is everything after the final slash. Either part may return an empty string.
* See http://docs.python.org/library/os.path.html#os.path.split
* @param {string} path A pathname.
* @return {!Array<string>} An array of [dirname, basename].
*/
goog.string.path.split = function(path) {
var head = goog.string.path.dirname(path);
var tail = goog.string.path.baseName(path);
return [head, tail];
};
// TODO(nnaze): Implement other useful functions from os.path
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