TableFilter/src/modules/highlightKeywords.js

define(["exports", "../dom", "../string"], function (exports, _dom, _string) {
  "use strict";

  var Dom = _dom.Dom;
  var Str = _string.Str;
  var HighlightKeyword = (function () {
    var HighlightKeyword =

    /**
     * HighlightKeyword, highlight matched keyword
     * @param {Object} tf TableFilter instance
     */
    function HighlightKeyword(tf) {
      var f = tf.fObj;
      //defines css class for highlighting
      this.highlightCssClass = f.highlight_css_class || "keyword";
      this.highlightedNodes = [];

      this.tf = tf;
    };

    HighlightKeyword.prototype.highlight = function (node, word, cssClass) {
      // Iterate into this nodes childNodes
      if (node.hasChildNodes) {
        var children = node.childNodes;
        for (var i = 0; i < children.length; i++) {
          this.highlight(children[i], word, cssClass);
        }
      }

      if (node.nodeType === 3) {
        var tempNodeVal = Str.lower(node.nodeValue);
        var tempWordVal = Str.lower(word);
        if (tempNodeVal.indexOf(tempWordVal) != -1) {
          var pn = node.parentNode;
          if (pn && pn.className != cssClass) {
            // word not highlighted yet
            var nv = node.nodeValue, ni = tempNodeVal.indexOf(tempWordVal),
            // Create a load of replacement nodes
            before = Dom.text(nv.substr(0, ni)), docWordVal = nv.substr(ni, word.length), after = Dom.text(nv.substr(ni + word.length)), hiwordtext = Dom.text(docWordVal), hiword = Dom.create("span");
            hiword.className = cssClass;
            hiword.appendChild(hiwordtext);
            pn.insertBefore(before, node);
            pn.insertBefore(hiword, node);
            pn.insertBefore(after, node);
            pn.removeChild(node);
            this.highlightedNodes.push(hiword.firstChild);
          }
        }
      }
    };

    HighlightKeyword.prototype.unhighlight = function (word, cssClass) {
      var arrRemove = [];
      var highlightedNodes = this.highlightedNodes;
      for (var i = 0; i < highlightedNodes.length; i++) {
        var n = highlightedNodes[i];
        if (!n) {
          continue;
        }
        var tempNodeVal = Str.lower(n.nodeValue), tempWordVal = Str.lower(word);
        if (tempNodeVal.indexOf(tempWordVal) !== -1) {
          var pn = n.parentNode;
          if (pn && pn.className === cssClass) {
            var prevSib = pn.previousSibling, nextSib = pn.nextSibling;
            if (!prevSib || !nextSib) {
              continue;
            }
            nextSib.nodeValue = prevSib.nodeValue + n.nodeValue + nextSib.nodeValue;
            prevSib.nodeValue = "";
            n.nodeValue = "";
            arrRemove.push(i);
          }
        }
      }
      for (var k = 0; k < arrRemove.length; k++) {
        highlightedNodes.splice(arrRemove[k], 1);
      }
    };

    HighlightKeyword.prototype.unhighlightAll = function () {
      if (!this.tf.highlightKeywords || !this.tf.searchArgs) {
        return;
      }
      for (var y = 0; y < this.tf.searchArgs.length; y++) {
        this.unhighlight(this.tf.searchArgs[y], this.highlightCssClass);
      }
      this.highlightedNodes = [];
    };

    return HighlightKeyword;
  })();

  exports.HighlightKeyword = HighlightKeyword;
});