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/**
* Plugin that highlights matched word partials in a given element.
* TODO: Add a function for restoring the previous text.
* TODO: Accept mappings for converting shortcuts like WP: to Wikipedia:.
*/
( function ( $ ) {
$.highlightText = {
// Split our pattern string at spaces and run our highlight function on the results
splitAndHighlight: function ( node, pat ) {
var i,
patArray = pat.split( ' ' );
for ( i = 0; i < patArray.length; i++ ) {
if ( patArray[i].length === 0 ) {
continue;
}
$.highlightText.innerHighlight( node, patArray[i] );
}
return node;
},
// scans a node looking for the pattern and wraps a span around each match
innerHighlight: function ( node, pat ) {
var i, match, pos, spannode, middlebit, middleclone;
// if this is a text node
if ( node.nodeType === 3 ) {
// TODO - need to be smarter about the character matching here.
// non latin characters can make regex think a new word has begun: do not use \b
// http://stackoverflow.com/questions/3787072/regex-wordwrap-with-utf8-characters-in-js
// look for an occurrence of our pattern and store the starting position
match = node.data.match( new RegExp( '(^|\\s)' + $.escapeRE( pat ), 'i' ) );
if ( match ) {
pos = match.index + match[1].length; // include length of any matched spaces
// create the span wrapper for the matched text
spannode = document.createElement( 'span' );
spannode.className = 'highlight';
// shave off the characters preceding the matched text
middlebit = node.splitText( pos );
// shave off any unmatched text off the end
middlebit.splitText( pat.length );
// clone for appending to our span
middleclone = middlebit.cloneNode( true );
// append the matched text node to the span
spannode.appendChild( middleclone );
// replace the matched node, with our span-wrapped clone of the matched node
middlebit.parentNode.replaceChild( spannode, middlebit );
}
// if this is an element with childnodes, and not a script, style or an element we created
} else if ( node.nodeType === 1
&& node.childNodes
&& !/(script|style)/i.test( node.tagName )
&& !( node.tagName.toLowerCase() === 'span'
&& node.className.match( /\bhighlight/ )
)
) {
for ( i = 0; i < node.childNodes.length; ++i ) {
// call the highlight function for each child node
$.highlightText.innerHighlight( node.childNodes[i], pat );
}
}
}
};
$.fn.highlightText = function ( matchString ) {
return this.each( function () {
var $el = $( this );
$el.data( 'highlightText', { originalText: $el.text() } );
$.highlightText.splitAndHighlight( this, matchString );
} );
};
}( jQuery ) );
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