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 *       notice, this list of conditions and the following disclaimer.
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 *       notice, this list of conditions and the following disclaimer in the
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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
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define(function (require, exports, module) {
    "use strict";

    var oop = require("../lib/oop");
    var lang = require("../lib/lang");
    var TextHighlightRules = require("./text_highlight_rules").TextHighlightRules;

    function safeCreateRegexp(source, flag) {
        try {
            return new RegExp(source, flag);
        } catch (e) {
        }
    }

    var C9SearchHighlightRules = function () {

        // regexp must not have capturing parentheses. Use (?:) instead.
        // regexps are ordered -> the first match is used
        this.$rules = {
            "start": [
                {
                    tokenNames: ["c9searchresults.constant.numeric", "c9searchresults.text", "c9searchresults.text", "c9searchresults.keyword"],
                    regex: /(^\s+[0-9]+)(:)(\d*\s?)([^\r\n]+)/,
                    onMatch: function (val, state, stack) {
                        var values = this.splitRegex.exec(val);
                        var types = this.tokenNames;
                        var tokens = [{
                            type: types[0],
                            value: values[1]
                        }, {
                            type: types[1],
                            value: values[2]
                        }];

                        if (values[3]) {
                            if (values[3] == " ")
                                tokens[1] = {type: types[1], value: values[2] + " "};
                            else
                                tokens.push({type: types[1], value: values[3]});
                        }
                        var regex = stack[1];
                        var str = values[4];

                        var m;
                        var last = 0;
                        if (regex && regex.exec) {
                            regex.lastIndex = 0;
                            while (m = regex.exec(str)) {
                                var skipped = str.substring(last, m.index);
                                last = regex.lastIndex;
                                if (skipped)
                                    tokens.push({type: types[2], value: skipped});
                                if (m[0])
                                    tokens.push({type: types[3], value: m[0]});
                                else if (!skipped)
                                    break;
                            }
                        }
                        if (last < str.length)
                            tokens.push({type: types[2], value: str.substr(last)});
                        return tokens;
                    }
                },
                {
                    regex: "^Searching for [^\\r\\n]*$",
                    onMatch: function (val, state, stack) {
                        var parts = val.split("\x01");
                        if (parts.length < 3)
                            return "text";

                        var options, search, replace;

                        var i = 0;
                        var tokens = [{
                            value: parts[i++] + "'",
                            type: "text"
                        }, {
                            value: search = parts[i++],
                            type: "text" // "c9searchresults.keyword"
                        }, {
                            value: "'" + parts[i++],
                            type: "text"
                        }];

                        // replaced
                        if (parts[2] !== " in") {
                            replace = parts[i];
                            tokens.push({
                                value: "'" + parts[i++] + "'",
                                type: "text"
                            }, {
                                value: parts[i++],
                                type: "text"
                            });
                        }
                        // path
                        tokens.push({
                            value: " " + parts[i++] + " ",
                            type: "text"
                        });
                        // options
                        if (parts[i + 1]) {
                            options = parts[i + 1];
                            tokens.push({
                                value: "(" + parts[i + 1] + ")",
                                type: "text"
                            });
                            i += 1;
                        } else {
                            i -= 1;
                        }
                        while (i++ < parts.length) {
                            parts[i] && tokens.push({
                                value: parts[i],
                                type: "text"
                            });
                        }

                        if (replace) {
                            search = replace;
                            options = "";
                        }

                        if (search) {
                            if (!/regex/.test(options))
                                search = lang.escapeRegExp(search);
                            if (/whole/.test(options))
                                search = "\\b" + search + "\\b";
                        }

                        var regex = search && safeCreateRegexp(
                                "(" + search + ")",
                                / sensitive/.test(options) ? "g" : "ig"
                            );
                        if (regex) {
                            stack[0] = state;
                            stack[1] = regex;
                        }

                        return tokens;
                    }
                },
                {
                    regex: "^(?=Found \\d+ matches)",
                    token: "text",
                    next: "numbers"
                },
                {
                    token: "string", // single line
                    regex: "^\\S:?[^:]+",
                    next: "numbers"
                }
            ],
            numbers: [{
                regex: "\\d+",
                token: "constant.numeric"
            }, {
                regex: "$",
                token: "text",
                next: "start"
            }]
        };
        this.normalizeRules();
    };

    oop.inherits(C9SearchHighlightRules, TextHighlightRules);

    exports.C9SearchHighlightRules = C9SearchHighlightRules;

});