303 lines
8.5 KiB
JavaScript
303 lines
8.5 KiB
JavaScript
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// .dirname, .basename, and .extname methods are extracted from Node.js v8.11.1,
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// backported and transplited with Babel, with backwards-compat fixes
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// 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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// 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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// 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') {
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throw new TypeError('Arguments to path.resolve must be strings');
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} else if (!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(filter(resolvedPath.split('/'), 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 = exports.isAbsolute(path),
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trailingSlash = substr(path, -1) === '/';
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// Normalize the path
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path = normalizeArray(filter(path.split('/'), 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.isAbsolute = function(path) {
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return path.charAt(0) === '/';
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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(filter(paths, function(p, index) {
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if (typeof p !== 'string') {
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throw new TypeError('Arguments to path.join must be strings');
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}
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return p;
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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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exports.sep = '/';
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exports.delimiter = ':';
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exports.dirname = function (path) {
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if (typeof path !== 'string') path = path + '';
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if (path.length === 0) return '.';
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var code = path.charCodeAt(0);
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var hasRoot = code === 47 /*/*/;
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var end = -1;
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var matchedSlash = true;
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for (var i = path.length - 1; i >= 1; --i) {
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code = path.charCodeAt(i);
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if (code === 47 /*/*/) {
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if (!matchedSlash) {
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end = i;
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break;
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}
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} else {
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// We saw the first non-path separator
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matchedSlash = false;
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}
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}
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if (end === -1) return hasRoot ? '/' : '.';
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if (hasRoot && end === 1) {
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// return '//';
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// Backwards-compat fix:
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return '/';
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}
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return path.slice(0, end);
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};
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function basename(path) {
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if (typeof path !== 'string') path = path + '';
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var start = 0;
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var end = -1;
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var matchedSlash = true;
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var i;
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for (i = path.length - 1; i >= 0; --i) {
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if (path.charCodeAt(i) === 47 /*/*/) {
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// If we reached a path separator that was not part of a set of path
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// separators at the end of the string, stop now
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if (!matchedSlash) {
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start = i + 1;
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break;
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}
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} else if (end === -1) {
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// We saw the first non-path separator, mark this as the end of our
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// path component
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matchedSlash = false;
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end = i + 1;
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}
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}
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if (end === -1) return '';
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return path.slice(start, end);
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}
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// Uses a mixed approach for backwards-compatibility, as ext behavior changed
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// in new Node.js versions, so only basename() above is backported here
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exports.basename = function (path, ext) {
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var f = basename(path);
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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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if (typeof path !== 'string') path = path + '';
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var startDot = -1;
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var startPart = 0;
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var end = -1;
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var matchedSlash = true;
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// Track the state of characters (if any) we see before our first dot and
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// after any path separator we find
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var preDotState = 0;
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for (var i = path.length - 1; i >= 0; --i) {
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var code = path.charCodeAt(i);
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if (code === 47 /*/*/) {
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// If we reached a path separator that was not part of a set of path
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// separators at the end of the string, stop now
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if (!matchedSlash) {
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startPart = i + 1;
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break;
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}
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continue;
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}
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if (end === -1) {
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// We saw the first non-path separator, mark this as the end of our
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// extension
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matchedSlash = false;
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end = i + 1;
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}
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if (code === 46 /*.*/) {
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// If this is our first dot, mark it as the start of our extension
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if (startDot === -1)
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startDot = i;
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else if (preDotState !== 1)
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preDotState = 1;
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} else if (startDot !== -1) {
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// We saw a non-dot and non-path separator before our dot, so we should
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// have a good chance at having a non-empty extension
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preDotState = -1;
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}
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}
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if (startDot === -1 || end === -1 ||
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// We saw a non-dot character immediately before the dot
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preDotState === 0 ||
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// The (right-most) trimmed path component is exactly '..'
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preDotState === 1 && startDot === end - 1 && startDot === startPart + 1) {
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return '';
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}
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return path.slice(startDot, end);
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};
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function filter (xs, f) {
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if (xs.filter) return xs.filter(f);
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var res = [];
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for (var i = 0; i < xs.length; i++) {
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if (f(xs[i], i, xs)) res.push(xs[i]);
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}
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return res;
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}
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// String.prototype.substr - negative index don't work in IE8
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var substr = 'ab'.substr(-1) === 'b'
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? function (str, start, len) { return str.substr(start, len) }
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: function (str, start, len) {
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if (start < 0) start = str.length + start;
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return str.substr(start, len);
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}
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;
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