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 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
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 * 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.
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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.
 * 
 * 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
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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define(function (require, exports, module) {
    "use strict";

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

    var LiquidHighlightRules = function () {
        HtmlHighlightRules.call(this);

        // see: https://developer.mozilla.org/en/Liquid/Reference/Global_Objects
        var functions = (
            // Standard Filters
            "date|capitalize|downcase|upcase|first|last|join|sort|map|size|escape|" +
            "escape_once|strip_html|strip_newlines|newline_to_br|replace|replace_first|" +
            "truncate|truncatewords|prepend|append|minus|plus|times|divided_by|split"
        );

        var keywords = (
            // Standard Tags
            "capture|endcapture|case|endcase|when|comment|endcomment|" +
            "cycle|for|endfor|in|reversed|if|endif|else|elsif|include|endinclude|unless|endunless|" +
            // Commonly used tags
            "style|text|image|widget|plugin|marker|endmarker|tablerow|endtablerow"
        );

        var builtinVariables = 'forloop|tablerowloop';
        // "forloop\\.(length|index|index0|rindex|rindex0|first|last)|limit|offset|range" +
        // "tablerowloop\\.(length|index|index0|rindex|rindex0|first|last|col|col0|"+
        // "col_first|col_last)"

        var definitions = ("assign");

        var keywordMapper = this.createKeywordMapper({
            "variable.language": builtinVariables,
            "keyword": keywords,
            "support.function": functions,
            "keyword.definition": definitions
        }, "identifier");

        // add liquid start tags to the HTML start tags
        for (var rule in this.$rules) {
            this.$rules[rule].unshift({
                token: "variable",
                regex: "{%",
                push: "liquid-start"
            }, {
                token: "variable",
                regex: "{{",
                push: "liquid-start"
            });
        }

        this.addRules({
            "liquid-start": [{
                token: "variable",
                regex: "}}",
                next: "pop"
            }, {
                token: "variable",
                regex: "%}",
                next: "pop"
            }, {
                token: "string", // single line
                regex: '["](?:(?:\\\\.)|(?:[^"\\\\]))*?["]'
            }, {
                token: "string", // single line
                regex: "['](?:(?:\\\\.)|(?:[^'\\\\]))*?[']"
            }, {
                token: "constant.numeric", // hex
                regex: "0[xX][0-9a-fA-F]+\\b"
            }, {
                token: "constant.numeric", // float
                regex: "[+-]?\\d+(?:(?:\\.\\d*)?(?:[eE][+-]?\\d+)?)?\\b"
            }, {
                token: "constant.language.boolean",
                regex: "(?:true|false)\\b"
            }, {
                token: keywordMapper,
                regex: "[a-zA-Z_$][a-zA-Z0-9_$]*\\b"
            }, {
                token: "keyword.operator",
                regex: "/|\\*|\\-|\\+|=|!=|\\?\\:"
            }, {
                token: "paren.lparen",
                regex: /[\[\({]/
            }, {
                token: "paren.rparen",
                regex: /[\])}]/
            }, {
                token: "text",
                regex: "\\s+"
            }]
        });

        this.normalizeRules();
    };
    oop.inherits(LiquidHighlightRules, TextHighlightRules);

    exports.LiquidHighlightRules = LiquidHighlightRules;
});
