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

    var oop = require("../lib/oop");
    var TextMode = require("./text").Mode;
    var TextHighlightRules = require("./text_highlight_rules").TextHighlightRules;

    var SnippetHighlightRules = function () {

        var builtins = "SELECTION|CURRENT_WORD|SELECTED_TEXT|CURRENT_LINE|LINE_INDEX|" +
            "LINE_NUMBER|SOFT_TABS|TAB_SIZE|FILENAME|FILEPATH|FULLNAME";

        this.$rules = {
            "start": [
                {token: "constant.language.escape", regex: /\\[\$}`\\]/},
                {token: "keyword", regex: "\\$(?:TM_)?(?:" + builtins + ")\\b"},
                {token: "variable", regex: "\\$\\w+"},
                {
                    onMatch: function (value, state, stack) {
                        if (stack[1])
                            stack[1]++;
                        else
                            stack.unshift(state, 1);
                        return this.tokenName;
                    }, tokenName: "markup.list", regex: "\\${", next: "varDecl"
                },
                {
                    onMatch: function (value, state, stack) {
                        if (!stack[1])
                            return "text";
                        stack[1]--;
                        if (!stack[1])
                            stack.splice(0, 2);
                        return this.tokenName;
                    }, tokenName: "markup.list", regex: "}"
                },
                {token: "doc.comment", regex: /^\${2}-{5,}$/}
            ],
            "varDecl": [
                {regex: /\d+\b/, token: "constant.numeric"},
                {token: "keyword", regex: "(?:TM_)?(?:" + builtins + ")\\b"},
                {token: "variable", regex: "\\w+"},
                {regex: /:/, token: "punctuation.operator", next: "start"},
                {regex: /\//, token: "string.regex", next: "regexp"},
                {regex: "", next: "start"}
            ],
            "regexp": [
                {regex: /\\./, token: "escape"},
                {regex: /\[/, token: "regex.start", next: "charClass"},
                {regex: "/", token: "string.regex", next: "format"},
                //{"default": "string.regex"},
                {"token": "string.regex", regex: "."}
            ],
            charClass: [
                {regex: "\\.", token: "escape"},
                {regex: "\\]", token: "regex.end", next: "regexp"},
                {"token": "string.regex", regex: "."}
            ],
            "format": [
                {regex: /\\[ulULE]/, token: "keyword"},
                {regex: /\$\d+/, token: "variable"},
                {regex: "/[gim]*:?", token: "string.regex", next: "start"},
                // {"default": "string"},
                {"token": "string", regex: "."}
            ]
        };
    };
    oop.inherits(SnippetHighlightRules, TextHighlightRules);

    exports.SnippetHighlightRules = SnippetHighlightRules;

    var SnippetGroupHighlightRules = function () {
        this.$rules = {
            "start": [
                {token: "text", regex: "^\\t", next: "sn-start"},
                {token: "invalid", regex: /^ \s*/},
                {token: "comment", regex: /^#.*/},
                {token: "constant.language.escape", regex: "^regex ", next: "regex"},
                {
                    token: "constant.language.escape",
                    regex: "^(trigger|endTrigger|name|snippet|guard|endGuard|tabTrigger|key)\\b"
                }
            ],
            "regex": [
                {token: "text", regex: "\\."},
                {token: "keyword", regex: "/"},
                {token: "empty", regex: "$", next: "start"}
            ]
        };
        this.embedRules(SnippetHighlightRules, "sn-", [
            {token: "text", regex: "^\\t", next: "sn-start"},
            {
                onMatch: function (value, state, stack) {
                    stack.splice(stack.length);
                    return this.tokenName;
                }, tokenName: "text", regex: "^(?!\t)", next: "start"
            }
        ])

    };

    oop.inherits(SnippetGroupHighlightRules, TextHighlightRules);

    exports.SnippetGroupHighlightRules = SnippetGroupHighlightRules;

    var FoldMode = require("./folding/coffee").FoldMode;

    var Mode = function () {
        this.HighlightRules = SnippetGroupHighlightRules;
        this.foldingRules = new FoldMode();
        this.$behaviour = this.$defaultBehaviour;
    };
    oop.inherits(Mode, TextMode);

    (function () {
        this.$indentWithTabs = true;
        this.lineCommentStart = "#";
        this.$id = "ace/mode/snippets";
    }).call(Mode.prototype);
    exports.Mode = Mode;


});
