113 lines
3.5 KiB
HTML
113 lines
3.5 KiB
HTML
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<!--
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@license
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Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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Code distributed by Google as part of the polymer project is also
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subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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-->
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<link rel="import" href="boot.html">
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<script>
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(function() {
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'use strict';
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let CSS_URL_RX = /(url\()([^)]*)(\))/g;
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let ABS_URL = /(^\/)|(^#)|(^[\w-\d]*:)/;
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let workingURL;
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let resolveDoc;
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/**
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* Resolves the given URL against the provided `baseUri'.
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*
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* Note that this function performs no resolution for URLs that start
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* with `/` (absolute URLs) or `#` (hash identifiers). For general purpose
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* URL resolution, use `window.URL`.
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*
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* @memberof Polymer.ResolveUrl
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* @param {string} url Input URL to resolve
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* @param {?string=} baseURI Base URI to resolve the URL against
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* @return {string} resolved URL
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*/
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function resolveUrl(url, baseURI) {
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if (url && ABS_URL.test(url)) {
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return url;
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}
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// Lazy feature detection.
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if (workingURL === undefined) {
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workingURL = false;
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try {
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const u = new URL('b', 'http://a');
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u.pathname = 'c%20d';
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workingURL = (u.href === 'http://a/c%20d');
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} catch (e) {
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// silently fail
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}
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}
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if (!baseURI) {
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baseURI = document.baseURI || window.location.href;
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}
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if (workingURL) {
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return (new URL(url, baseURI)).href;
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}
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// Fallback to creating an anchor into a disconnected document.
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if (!resolveDoc) {
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resolveDoc = document.implementation.createHTMLDocument('temp');
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resolveDoc.base = resolveDoc.createElement('base');
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resolveDoc.head.appendChild(resolveDoc.base);
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resolveDoc.anchor = resolveDoc.createElement('a');
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resolveDoc.body.appendChild(resolveDoc.anchor);
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}
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resolveDoc.base.href = baseURI;
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resolveDoc.anchor.href = url;
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return resolveDoc.anchor.href || url;
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}
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/**
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* Resolves any relative URL's in the given CSS text against the provided
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* `ownerDocument`'s `baseURI`.
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*
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* @memberof Polymer.ResolveUrl
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* @param {string} cssText CSS text to process
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* @param {string} baseURI Base URI to resolve the URL against
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* @return {string} Processed CSS text with resolved URL's
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*/
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function resolveCss(cssText, baseURI) {
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return cssText.replace(CSS_URL_RX, function(m, pre, url, post) {
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return pre + '\'' +
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resolveUrl(url.replace(/["']/g, ''), baseURI) +
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'\'' + post;
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});
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}
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/**
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* Returns a path from a given `url`. The path includes the trailing
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* `/` from the url.
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*
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* @memberof Polymer.ResolveUrl
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* @param {string} url Input URL to transform
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* @return {string} resolved path
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*/
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function pathFromUrl(url) {
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return url.substring(0, url.lastIndexOf('/') + 1);
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}
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/**
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* Module with utilities for resolving relative URL's.
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*
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* @namespace
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* @memberof Polymer
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* @summary Module with utilities for resolving relative URL's.
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*/
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Polymer.ResolveUrl = {
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resolveCss: resolveCss,
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resolveUrl: resolveUrl,
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pathFromUrl: pathFromUrl
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};
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})();
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</script>
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