/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {
"use strict";

var lang = require("./lib/lang");
var oop = require("./lib/oop");
var Range = require("./range").Range;

var SearchHighlight = function(regExp, clazz, type) {
    this.setRegexp(regExp);
    this.clazz = clazz;
    this.type = type || "text";
};

(function() {
    // needed to prevent long lines from freezing the browser
    this.MAX_RANGES = 500;
    
    this.setRegexp = function(regExp) {
        if (this.regExp+"" == regExp+"")
            return;
        this.regExp = regExp;
        this.cache = [];
    };

    this.update = function(html, markerLayer, session, config) {
        if (!this.regExp)
            return;
        var start = config.firstRow, end = config.lastRow;

        for (var i = start; i <= end; i++) {
            var ranges = this.cache[i];
            if (ranges == null) {
                ranges = lang.getMatchOffsets(session.getLine(i), this.regExp);
                if (ranges.length > this.MAX_RANGES)
                    ranges = ranges.slice(0, this.MAX_RANGES);
                ranges = ranges.map(function(match) {
                    return new Range(i, match.offset, i, match.offset + match.length);
                });
                this.cache[i] = ranges.length ? ranges : "";
            }

            for (var j = ranges.length; j --; ) {
                markerLayer.drawSingleLineMarker(
                    html, ranges[j].toScreenRange(session), this.clazz, config);
            }
        }
    };

}).call(SearchHighlight.prototype);

exports.SearchHighlight = SearchHighlight;
});