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 * 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
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * 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 oop = require("../lib/oop");
var CssHighlightRules = require("./css_highlight_rules").CssHighlightRules;
var JavaScriptHighlightRules = require("./javascript_highlight_rules").JavaScriptHighlightRules;
var xmlUtil = require("./xml_util");
var TextHighlightRules = require("./text_highlight_rules").TextHighlightRules;

var LiquidHighlightRules = function() {

    // 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");

    // regexp must not have capturing parentheses. Use (?:) instead.
    // regexps are ordered -> the first match is used

    this.$rules = {
        start : [{
            token : "variable",
            regex : "{%",
            next : "liquid_start"
        }, {
            token : "variable",
            regex : "{{",
            next : "liquid_start"
        }, {
            token : "meta.tag",
            merge : true,
            regex : "<\\!\\[CDATA\\[",
            next : "cdata"
        }, {
            token : "xml-pe",
            regex : "<\\?.*?\\?>"
        }, {
            token : "comment",
            merge : true,
            regex : "<\\!--",
            next : "comment"
        }, {
            token : "meta.tag",
            regex : "<(?=\\s*script\\b)",
            next : "script"
        }, {
            token : "meta.tag",
            regex : "<(?=\\s*style\\b)",
            next : "style"
        }, {
            token : "meta.tag", // opening tag
            regex : "<\\/?",
            next : "tag"
        }, {
            token : "text",
            regex : "\\s+"
        }, {
            token : "text",
            regex : "[^<]+"
        } ],

        cdata : [ {
            token : "text",
            regex : "\\]\\]>",
            next : "start"
        }, {
            token : "text",
            merge : true,
            regex : "\\s+"
        }, {
            token : "text",
            merge : true,
            regex : ".+"
        } ],

        comment : [ {
            token : "comment",
            regex : ".*?-->",
            next : "start"
        }, {
            token : "comment",
            merge : true,
            regex : ".+"
        } ] ,

        liquid_start : [{
            token: "variable",
            regex: "}}",
            next: "start"
        }, {
            token: "variable",
            regex: "%}",
            next: "start"
        }, {
            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+"
        }]
    };

    xmlUtil.tag(this.$rules, "tag", "start");
    xmlUtil.tag(this.$rules, "style", "css-start");
    xmlUtil.tag(this.$rules, "script", "js-start");

    this.embedRules(JavaScriptHighlightRules, "js-", [{
        token: "comment",
        regex: "\\/\\/.*(?=<\\/script>)",
        next: "tag"
    }, {
        token: "meta.tag",
        regex: "<\\/(?=script)",
        next: "tag"
    }]);

    this.embedRules(CssHighlightRules, "css-", [{
        token: "meta.tag",
        regex: "<\\/(?=style)",
        next: "tag"
    }]);
};
oop.inherits(LiquidHighlightRules, TextHighlightRules);

exports.LiquidHighlightRules = LiquidHighlightRules;
});
