this.rubyBlock = function()

in lib/ace/mode/folding/ruby.js [142:289]
138 lines of code
61 McCabe index (conditional complexity)

    this.rubyBlock = function (session, row, column, tokenRange) {
        var stream = new TokenIterator(session, row, column);

        var token = stream.getCurrentToken();
        if (!token || (token.type != "keyword" && token.type != "comment.multiline"))
            return;

        var val = token.value;
        var line = session.getLine(row);
        switch (token.value) {
            case "if":
            case "unless":
            case "while":
            case "until":
                var checkToken = new RegExp("^\\s*" + token.value);
                if (!checkToken.test(line)) {
                    return;
                }
                var dir = this.indentKeywords[val];
                break;
            case "when":
                if (/\sthen\s/.test(line)) {
                    return;
                }
            case "elsif":
            case "rescue":
            case "ensure":
                var dir = 1;
                break;
            case "else":
                var checkToken = new RegExp("^\\s*" + token.value + "\\s*$");
                if (!checkToken.test(line)) {
                    return;
                }
                var dir = 1;
                break;
            default:
                var dir = this.indentKeywords[val];
                break;
        }

        var stack = [val];
        if (!dir)
            return;

        var startColumn = dir === -1 ? session.getLine(row - 1).length : session.getLine(row).length;
        var startRow = row;
        var ranges = [];
        ranges.push(stream.getCurrentTokenRange());

        stream.step = dir === -1 ? stream.stepBackward : stream.stepForward;
        if (token.type == "comment.multiline") {
            while (token = stream.step()) {
                if (token.type !== "comment.multiline")
                    continue;
                if (dir == 1) {
                    startColumn = 6;
                    if (token.value == "=end") {
                        break;
                    }
                } else {
                    if (token.value == "=begin") {
                        break;
                    }
                }
            }
        } else {
            while (token = stream.step()) {
                var ignore = false;
                if (token.type !== "keyword")
                    continue;
                var level = dir * this.indentKeywords[token.value];
                line = session.getLine(stream.getCurrentTokenRow());
                switch (token.value) {
                    case "do":
                        for (var i = stream.$tokenIndex - 1; i >= 0; i--) {
                            var prevToken = stream.$rowTokens[i];
                            if (prevToken && (prevToken.value == "while" || prevToken.value == "until" || prevToken.value == "for")) {
                                level = 0;
                                break;
                            }
                        }
                        break;
                    case "else":
                        var checkToken = new RegExp("^\\s*" + token.value + "\\s*$");
                        if (!checkToken.test(line) || val == "case") {
                            level = 0;
                            ignore = true;
                        }
                        break;
                    case "if":
                    case "unless":
                    case "while":
                    case "until":
                        var checkToken = new RegExp("^\\s*" + token.value);
                        if (!checkToken.test(line)) {
                            level = 0;
                            ignore = true;
                        }
                        break;
                    case "when":
                        if (/\sthen\s/.test(line) || val == "case") {
                            level = 0;
                            ignore = true;
                        }
                        break;
                }

                if (level > 0) {
                    stack.unshift(token.value);
                } else if (level <= 0 && ignore === false) {
                    stack.shift();
                    if (!stack.length) {
                        if ((val == "while" || val == "until" || val == "for") && token.value != "do") {
                            break;
                        }
                        if (token.value == "do" && dir == -1 && level != 0)
                            break;
                        if (token.value != "do")
                            break;
                    }

                    if (level === 0) {
                        stack.unshift(token.value);
                    }
                }
            }
        }

        if (!token)
            return null;

        if (tokenRange) {
            ranges.push(stream.getCurrentTokenRange());
            return ranges;
        }

        var row = stream.getCurrentTokenRow();
        if (dir === -1) {
            if (token.type === "comment.multiline") {
                var endColumn = 6;
            } else {
                var endColumn = session.getLine(row).length;
            }
            return new Range(row, endColumn, startRow - 1, startColumn);
        } else
            return new Range(startRow, startColumn, row - 1, session.getLine(row - 1).length);
    };