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 * Copyright (c) 2010, Ajax.org B.V.
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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.
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 *       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
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define(function (require, exports, module) {
    "use strict";

    var oop = require("../lib/oop");
    var TextMode = require("./text").Mode;
    var PythonHighlightRules = require("./python_highlight_rules").PythonHighlightRules;
    var PythonFoldMode = require("./folding/pythonic").FoldMode;
    var Range = require("../range").Range;

    var Mode = function () {
        this.HighlightRules = PythonHighlightRules;
        this.foldingRules = new PythonFoldMode("\\:");
        this.$behaviour = this.$defaultBehaviour;
    };
    oop.inherits(Mode, TextMode);

    (function () {

        this.lineCommentStart = "#";

        this.getNextLineIndent = function (state, line, tab) {
            var indent = this.$getIndent(line);

            var tokenizedLine = this.getTokenizer().getLineTokens(line, state);
            var tokens = tokenizedLine.tokens;

            if (tokens.length && tokens[tokens.length - 1].type == "comment") {
                return indent;
            }

            if (state == "start") {
                var match = line.match(/^.*[\{\(\[:]\s*$/);
                if (match) {
                    indent += tab;
                }
            }

            return indent;
        };

        var outdents = {
            "pass": 1,
            "return": 1,
            "raise": 1,
            "break": 1,
            "continue": 1
        };

        this.checkOutdent = function (state, line, input) {
            if (input !== "\r\n" && input !== "\r" && input !== "\n")
                return false;

            var tokens = this.getTokenizer().getLineTokens(line.trim(), state).tokens;

            if (!tokens)
                return false;

            // ignore trailing comments
            do {
                var last = tokens.pop();
            } while (last && (last.type == "comment" || (last.type == "text" && last.value.match(/^\s+$/))));

            if (!last)
                return false;

            return (last.type == "keyword" && outdents[last.value]);
        };

        this.autoOutdent = function (state, doc, row) {
            // outdenting in python is slightly different because it always applies
            // to the next line and only of a new line is inserted

            row += 1;
            var indent = this.$getIndent(doc.getLine(row));
            var tab = doc.getTabString();
            if (indent.slice(-tab.length) == tab)
                doc.remove(new Range(row, indent.length - tab.length, row, indent.length));
        };

        this.$id = "ace/mode/python";
    }).call(Mode.prototype);

    exports.Mode = Mode;
});
