124 lines
4.0 KiB
JavaScript
124 lines
4.0 KiB
JavaScript
/**
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* Copyright 2015 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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function CodeBlockCodePen() {
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'use strict';
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this.htmlCodeBlocks = document.getElementsByClassName('language-markup');
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this.init();
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}
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// Also insert the MDL Library.
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CodeBlockCodePen.prototype.MDLIBS = [
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// TODO: Remove below before launch. For testing only.
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'<!-- For testing. TODO: Remove before launch -->',
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'<link rel="stylesheet" href="http://mdl-staging.storage.googleapis.com/material.min.css">',
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'<script src="http://mdl-staging.storage.googleapis.com/material.min.js"></script>',
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'<!-- Material Design Lite -->',
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'<script src="$$hosted_libs_prefix$$/$$version$$/material.min.js"></script>',
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'<link rel="stylesheet" href="$$hosted_libs_prefix$$/$$version$$/material.indigo-pink.min.css">',
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'<!-- Material Design icon font -->',
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'<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">'
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];
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/**
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* Creates CodePen buttons in all code blocks (`pre`) that are HTML.
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*/
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CodeBlockCodePen.prototype.init = function() {
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'use strict';
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for (var i = 0, len = this.htmlCodeBlocks.length; i < len; i++) {
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var pre = this.htmlCodeBlocks[i];
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// If pre is a <code> node we check if it's enclosed in a <pre> tag and
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// process that instead.
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if (pre.tagName.toLowerCase() !== 'pre') {
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pre = pre.parentNode;
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}
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// Verify there is not already a codePen Button and that we are in a <pre>.
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if (pre.getElementsByTagName('form').length > 0 ||
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pre.tagName.toLowerCase() !== 'pre') {
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continue;
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}
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// Create the CodePen Form and add it to the <pre> block.
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var form = document.createElement('form');
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form.classList.add('codepen-button');
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form.setAttribute('action', 'https://codepen.io/pen/define');
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form.setAttribute('method', 'POST');
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form.setAttribute('target', '_blank');
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form.addEventListener('click', this.clickHandler(form, pre));
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pre.appendChild(form);
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}
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};
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/**
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* Click handler for CodePEn buttons. Simply submits the form to CodePen.
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*/
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CodeBlockCodePen.prototype.clickHandler = function(form, pre) {
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'use strict';
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return function() {
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// Modify relative URLs to make them absolute.
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var code = pre.textContent.replace('../assets/demos/',
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window.location.origin + '/assets/demos/');
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// Extract <style> blocks from the source code.
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var styleLines = [];
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while (code.indexOf('<style>') !== -1) {
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var startIndex = code.indexOf('<style>');
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var endIndex = code.indexOf('</style>');
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var styleBlock = code.substring(startIndex + 7, endIndex).trim();
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var styleBlockLines = styleBlock.split('\n').map(
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function(elem) {
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return elem.trim();
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});
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styleLines = styleLines.concat(styleBlockLines);
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code = code.substring(0, startIndex).trim() + '\n' +
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code.substr(endIndex + 8).trim();
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}
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// Remove <input> children from previous clicks.
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while (form.firstChild) {
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form.removeChild(form.firstChild);
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}
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var input = document.createElement('input');
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input.setAttribute('type', 'hidden');
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input.setAttribute('name', 'data');
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input.setAttribute('value', JSON.stringify(
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{html: '<html>\n <head>\n ' +
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this.MDLIBS.join('\n ') +
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'\n </head>\n <body>\n ' +
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code.split('\n').join('\n ').trim() +
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'\n </body>\n</html>',
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css: styleLines.join('\n').trim()}));
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form.appendChild(input);
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form.submit();
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}.bind(this);
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};
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window.addEventListener('load', function() {
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'use strict';
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new CodeBlockCodePen();
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});
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