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dashboard-ui/bower_components/prism-element/prism-highlighter.html
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dashboard-ui/bower_components/prism-element/prism-highlighter.html
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<!--
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@license
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Copyright (c) 2015 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="../polymer/polymer.html">
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<link rel="import" href="prism-import.html">
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<!--
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Syntax highlighting via [Prism](http://prismjs.com/).
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Place a `<prism-highlighter>` in your document, preferably as a direct child of
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`<body>`. It will listen for `syntax-highlight` events on its parent element,
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and annotate the code being provided via that event.
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The `syntax-highlight` event's detail is expected to have a `code` property
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containing the source to highlight. The event detail can optionally contain a
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`lang` property, containing a string like `"html"`, `"js"`, etc.
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This flow is supported by [`<marked-element>`](https://github.com/PolymerElements/marked-element).
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-->
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<script>
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(function() {
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'use strict';
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var HIGHLIGHT_EVENT = 'syntax-highlight';
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Polymer({
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is: 'prism-highlighter',
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ready: function() {
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this._handler = this._highlight.bind(this);
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},
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attached: function() {
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(this.parentElement || this.parentNode.host).addEventListener(HIGHLIGHT_EVENT, this._handler);
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},
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detached: function() {
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(this.parentElement || this.parentNode.host).removeEventListener(HIGHLIGHT_EVENT, this._handler);
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},
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/**
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* Handle the highlighting event, if we can.
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*
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* @param {!CustomEvent} event
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*/
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_highlight: function(event) {
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if (!event.detail || !event.detail.code) {
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console.warn('Malformed', HIGHLIGHT_EVENT, 'event:', event.detail);
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return;
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}
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var detail = event.detail;
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detail.code = Prism.highlight(detail.code, this._detectLang(detail.code, detail.lang));
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},
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/**
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* Picks a Prism formatter based on the `lang` hint and `code`.
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*
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* @param {string} code The source being highlighted.
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* @param {string=} lang A language hint (e.g. ````LANG`).
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* @return {!prism.Lang}
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*/
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_detectLang: function(code, lang) {
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if (!lang) {
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// Stupid simple detection if we have no lang, courtesy of:
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// https://github.com/robdodson/mark-down/blob/ac2eaa/mark-down.html#L93-101
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return code.match(/^\s*</) ? Prism.languages.markup : Prism.languages.javascript;
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}
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if (lang === 'js' || lang.substr(0, 2) === 'es') {
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return Prism.languages.javascript;
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} else if (lang === 'css') {
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return Prism.languages.css;
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} else if (lang === 'c') {
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return Prism.languages.clike;
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} else {
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// The assumption is that you're mostly documenting HTML when in HTML.
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return Prism.languages.markup;
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}
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},
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});
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})();
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</script>
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