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 *       notice, this list of conditions and the following disclaimer.
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 *       names of its contributors may be used to endorse or promote products
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define(function (require, exports, module) {
    "use strict";

    var Range = require("../../range").Range;

    var FoldMode = exports.FoldMode = function () {
    };

    (function () {

        this.foldingStartMarker = null;
        this.foldingStopMarker = null;

        // must return "" if there's no fold, to enable caching
        this.getFoldWidget = function (session, foldStyle, row) {
            var line = session.getLine(row);
            if (this.foldingStartMarker.test(line))
                return "start";
            if (foldStyle == "markbeginend"
                && this.foldingStopMarker
                && this.foldingStopMarker.test(line))
                return "end";
            return "";
        };

        this.getFoldWidgetRange = function (session, foldStyle, row) {
            return null;
        };

        this.indentationBlock = function (session, row, column) {
            var re = /\S/;
            var line = session.getLine(row);
            var startLevel = line.search(re);
            if (startLevel == -1)
                return;

            var startColumn = column || line.length;
            var maxRow = session.getLength();
            var startRow = row;
            var endRow = row;

            while (++row < maxRow) {
                var level = session.getLine(row).search(re);

                if (level == -1)
                    continue;

                if (level <= startLevel)
                    break;

                endRow = row;
            }

            if (endRow > startRow) {
                var endColumn = session.getLine(endRow).length;
                return new Range(startRow, startColumn, endRow, endColumn);
            }
        };

        this.openingBracketBlock = function (session, bracket, row, column, typeRe) {
            var start = {row: row, column: column + 1};
            var end = session.$findClosingBracket(bracket, start, typeRe);
            if (!end)
                return;

            var fw = session.foldWidgets[end.row];
            if (fw == null)
                fw = session.getFoldWidget(end.row);

            if (fw == "start" && end.row > start.row) {
                end.row--;
                end.column = session.getLine(end.row).length;
            }
            return Range.fromPoints(start, end);
        };

        this.closingBracketBlock = function (session, bracket, row, column, typeRe) {
            var end = {row: row, column: column};
            var start = session.$findOpeningBracket(bracket, end);

            if (!start)
                return;

            start.column++;
            end.column--;

            return Range.fromPoints(start, end);
        };
    }).call(FoldMode.prototype);

});
