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manish.sha |
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/*
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* typeahead.js
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* https://github.com/twitter/typeahead.js
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* Copyright 2013-2014 Twitter, Inc. and other contributors; Licensed MIT
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*/
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// inspired by https://github.com/jharding/bearhug
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var highlight = (function(doc) {
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'use strict';
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var defaults = {
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node: null,
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pattern: null,
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tagName: 'strong',
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className: null,
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wordsOnly: false,
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caseSensitive: false
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};
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return function hightlight(o) {
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var regex;
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o = _.mixin({}, defaults, o);
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if (!o.node || !o.pattern) {
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// fail silently
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return;
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}
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// support wrapping multiple patterns
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o.pattern = _.isArray(o.pattern) ? o.pattern : [o.pattern];
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regex = getRegex(o.pattern, o.caseSensitive, o.wordsOnly);
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traverse(o.node, hightlightTextNode);
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function hightlightTextNode(textNode) {
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var match, patternNode, wrapperNode;
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if (match = regex.exec(textNode.data)) {
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wrapperNode = doc.createElement(o.tagName);
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o.className && (wrapperNode.className = o.className);
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patternNode = textNode.splitText(match.index);
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patternNode.splitText(match[0].length);
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wrapperNode.appendChild(patternNode.cloneNode(true));
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textNode.parentNode.replaceChild(wrapperNode, patternNode);
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}
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return !!match;
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}
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function traverse(el, hightlightTextNode) {
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var childNode, TEXT_NODE_TYPE = 3;
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for (var i = 0; i < el.childNodes.length; i++) {
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childNode = el.childNodes[i];
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if (childNode.nodeType === TEXT_NODE_TYPE) {
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i += hightlightTextNode(childNode) ? 1 : 0;
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}
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else {
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traverse(childNode, hightlightTextNode);
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}
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}
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}
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};
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function getRegex(patterns, caseSensitive, wordsOnly) {
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var escapedPatterns = [], regexStr;
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for (var i = 0, len = patterns.length; i < len; i++) {
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escapedPatterns.push(_.escapeRegExChars(patterns[i]));
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}
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regexStr = wordsOnly ?
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'\\b(' + escapedPatterns.join('|') + ')\\b' :
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'(' + escapedPatterns.join('|') + ')';
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return caseSensitive ? new RegExp(regexStr) : new RegExp(regexStr, 'i');
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}
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})(window.document);
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