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-/**
- * Search Engine Keyword Highlight (http://fucoder.com/code/se-hilite/)
- *
- * This module can be imported by any HTML page, and it would analyse the
- * referrer for search engine keywords, and then highlight those keywords on
- * the page, by wrapping them around <span class="hilite">...</span> tags.
- * Document can then define styles else where to provide visual feedbacks.
- *
- * Usage:
- *
- * In HTML. Add the following line towards the end of the document.
- *
- * <script type="text/javascript" src="se_hilite.js"></script>
- *
- * In CSS, define the following style:
- *
- * .hilite { background-color: #ff0; }
- *
- * If Hilite.style_name_suffix is true, then define the follow styles:
- *
- * .hilite1 { background-color: #ff0; }
- * .hilite2 { background-color: #f0f; }
- * .hilite3 { background-color: #0ff; }
- * .hilite4 ...
- *
- * @author Scott Yang <http://scott.yang.id.au/>
- * @version 1.5
- */
-
-// Configuration:
-Hilite = {
- /**
- * Element ID to be highlighted. If set, then only content inside this DOM
- * element will be highlighted, otherwise everything inside document.body
- * will be searched.
- */
- elementid: 'content',
-
- /**
- * Whether we are matching an exact word. For example, searching for
- * "highlight" will only match "highlight" but not "highlighting" if exact
- * is set to true.
- */
- exact: true,
-
- /**
- * Maximum number of DOM nodes to test, before handing the control back to
- * the GUI thread. This prevents locking up the UI when parsing and
- * replacing inside a large document.
- */
- max_nodes: 1000,
-
- /**
- * Whether to automatically hilite a section of the HTML document, by
- * binding the "Hilite.hilite()" to window.onload() event. If this
- * attribute is set to false, you can still manually trigger the hilite by
- * calling Hilite.hilite() in Javascript after document has been fully
- * loaded.
- */
- onload: true,
-
- /**
- * Name of the style to be used. Default to 'hilite'.
- */
- style_name: 'hilite',
-
- /**
- * Whether to use different style names for different search keywords by
- * appending a number starting from 1, i.e. hilite1, hilite2, etc.
- */
- style_name_suffix: true,
-
- /**
- * Set it to override the document.referrer string. Used for debugging
- * only.
- */
- debug_referrer: ''
-};
-
-Hilite.search_engines = [
- ['google\\.', 'q'], // Google
- ['search\\.yahoo\\.', 'p'], // Yahoo
- ['search\\.msn\\.', 'q'], // MSN
- ['search\\.live\\.', 'query'], // MSN Live
- ['search\\.aol\\.', 'userQuery'], // AOL
- ['ask\\.com', 'q'], // Ask.com
- ['altavista\\.', 'q'], // AltaVista
- ['feedster\\.', 'q'], // Feedster
- ['search\\.lycos\\.', 'q'], // Lycos
- ['alltheweb\\.', 'q'], // AllTheWeb
- ['technorati\\.com/search/([^\\?/]+)', 1], // Technorati
- ['dogpile\\.com/info\\.dogpl/search/web/([^\\?/]+)', 1, true] // DogPile
-];
-
-/**
- * Decode the referrer string and return a list of search keywords.
- */
-Hilite.decodeReferrer = function(referrer) {
- var query = null;
- var regex = new RegExp('');
-
- for (var i = 0; i < Hilite.search_engines.length; i ++) {
- var se = Hilite.search_engines[i];
- regex.compile('^http://(www\\.)?' + se[0], 'i');
- var match = referrer.match(regex);
- if (match) {
- var result;
- if (isNaN(se[1])) {
- result = Hilite.decodeReferrerQS(referrer, se[1]);
- } else {
- result = match[se[1] + 1];
- }
- if (result) {
- result = decodeURIComponent(result);
- // XXX: DogPile's URI requires decoding twice.
- if (se.length > 2 && se[2])
- result = decodeURIComponent(result);
- result = result.replace(/\'|"/g, '');
- result = result.split(/[\s,\+\.]+/);
- return result;
- }
- break;
- }
- }
- return null;
-};
-
-Hilite.decodeReferrerQS = function(referrer, match) {
- var idx = referrer.indexOf('?');
- var idx2;
- if (idx >= 0) {
- var qs = new String(referrer.substring(idx + 1));
- idx = 0;
- idx2 = 0;
- while ((idx >= 0) && ((idx2 = qs.indexOf('=', idx)) >= 0)) {
- var key, val;
- key = qs.substring(idx, idx2);
- idx = qs.indexOf('&', idx2) + 1;
- if (key == match) {
- if (idx <= 0) {
- return qs.substring(idx2+1);
- } else {
- return qs.substring(idx2+1, idx - 1);
- }
- }
- else if (idx <=0) {
- return null;
- }
- }
- }
- return null;
-};
-
-/**
- * Highlight a DOM element with a list of keywords.
- */
-Hilite.hiliteElement = function(elm, query) {
- if (!query || elm.childNodes.length == 0)
- return;
-
- var qre = new Array();
- for (var i = 0; i < query.length; i ++) {
- query[i] = query[i].toLowerCase();
- if (Hilite.exact)
- qre.push('\\b'+query[i]+'\\b');
- else
- qre.push(query[i]);
- }
-
- qre = new RegExp(qre.join("|"), "i");
-
- var stylemapper = {};
- for (var i = 0; i < query.length; i ++) {
- if (Hilite.style_name_suffix)
- stylemapper[query[i]] = Hilite.style_name+(i+1);
- else
- stylemapper[query[i]] = Hilite.style_name;
- }
-
- var textproc = function(node) {
- var match = qre.exec(node.data);
- if (match) {
- var val = match[0];
- var k = '';
- var node2 = node.splitText(match.index);
- var node3 = node2.splitText(val.length);
- var span = node.ownerDocument.createElement('SPAN');
- node.parentNode.replaceChild(span, node2);
- span.className = stylemapper[val.toLowerCase()];
- span.appendChild(node2);
- return span;
- } else {
- return node;
- }
- };
- Hilite.walkElements(elm.childNodes[0], 1, textproc);
-};
-
-/**
- * Highlight a HTML document using keywords extracted from document.referrer.
- * This is the main function to be called to perform search engine highlight
- * on a document.
- *
- * Currently it would check for DOM element 'content', element 'container' and
- * then document.body in that order, so it only highlights appropriate section
- * on WordPress and Movable Type pages.
- */
-Hilite.hilite = function() {
- // If 'debug_referrer' then we will use that as our referrer string
- // instead.
- var q = Hilite.debug_referrer ? Hilite.debug_referrer : document.referrer;
- var e = null;
- q = Hilite.decodeReferrer(q);
- if (q && ((Hilite.elementid &&
- (e = document.getElementById(Hilite.elementid))) ||
- (e = document.body)))
- {
- Hilite.hiliteElement(e, q);
- }
-};
-
-Hilite.walkElements = function(node, depth, textproc) {
- var skipre = /^(script|style|textarea)/i;
- var count = 0;
- while (node && depth > 0) {
- count ++;
- if (count >= Hilite.max_nodes) {
- var handler = function() {
- Hilite.walkElements(node, depth, textproc);
- };
- setTimeout(handler, 50);
- return;
- }
-
- if (node.nodeType == 1) { // ELEMENT_NODE
- if (!skipre.test(node.tagName) && node.childNodes.length > 0) {
- node = node.childNodes[0];
- depth ++;
- continue;
- }
- } else if (node.nodeType == 3) { // TEXT_NODE
- node = textproc(node);
- }
-
- if (node.nextSibling) {
- node = node.nextSibling;
- } else {
- while (depth > 0) {
- node = node.parentNode;
- depth --;
- if (node.nextSibling) {
- node = node.nextSibling;
- break;
- }
- }
- }
- }
-};
-
-// Trigger the highlight using the onload handler.
-if (Hilite.onload) {
- if (window.attachEvent) {
- window.attachEvent('onload', Hilite.hilite);
- } else if (window.addEventListener) {
- window.addEventListener('load', Hilite.hilite, false);
- } else {
- var __onload = window.onload;
- window.onload = function() {
- Hilite.hilite();
- __onload();
- };
- }
-}
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