var XmlBehaviour = function()

in src-noconflict/mode-xml.js [216:369]
134 lines of code
56 McCabe index (conditional complexity)

var XmlBehaviour = function () {

    this.add("string_dquotes", "insertion", function (state, action, editor, session, text) {
        if (text == '"' || text == "'") {
            var quote = text;
            var selected = session.doc.getTextRange(editor.getSelectionRange());
            if (selected !== "" && selected !== "'" && selected != '"' && editor.getWrapBehavioursEnabled()) {
                return {
                    text: quote + selected + quote,
                    selection: false
                };
            }

            var cursor = editor.getCursorPosition();
            var line = session.doc.getLine(cursor.row);
            var rightChar = line.substring(cursor.column, cursor.column + 1);
            var iterator = new TokenIterator(session, cursor.row, cursor.column);
            var token = iterator.getCurrentToken();

            if (rightChar == quote && (is(token, "attribute-value") || is(token, "string"))) {
                return {
                    text: "",
                    selection: [1, 1]
                };
            }

            if (!token)
                token = iterator.stepBackward();

            if (!token)
                return;

            while (is(token, "tag-whitespace") || is(token, "whitespace")) {
                token = iterator.stepBackward();
            }
            var rightSpace = !rightChar || rightChar.match(/\s/);
            if (is(token, "attribute-equals") && (rightSpace || rightChar == '>') || (is(token, "decl-attribute-equals") && (rightSpace || rightChar == '?'))) {
                return {
                    text: quote + quote,
                    selection: [1, 1]
                };
            }
        }
    });

    this.add("string_dquotes", "deletion", function(state, action, editor, session, range) {
        var selected = session.doc.getTextRange(range);
        if (!range.isMultiLine() && (selected == '"' || selected == "'")) {
            var line = session.doc.getLine(range.start.row);
            var rightChar = line.substring(range.start.column + 1, range.start.column + 2);
            if (rightChar == selected) {
                range.end.column++;
                return range;
            }
        }
    });

    this.add("autoclosing", "insertion", function (state, action, editor, session, text) {
        if (text == '>') {
            var position = editor.getSelectionRange().start;
            var iterator = new TokenIterator(session, position.row, position.column);
            var token = iterator.getCurrentToken() || iterator.stepBackward();
            if (!token || !(is(token, "tag-name") || is(token, "tag-whitespace") || is(token, "attribute-name") || is(token, "attribute-equals") || is(token, "attribute-value")))
                return;
            if (is(token, "reference.attribute-value"))
                return;
            if (is(token, "attribute-value")) {
                var tokenEndColumn = iterator.getCurrentTokenColumn() + token.value.length;
                if (position.column < tokenEndColumn)
                    return;
                if (position.column == tokenEndColumn) {
                    var nextToken = iterator.stepForward();
                    if (nextToken && is(nextToken, "attribute-value"))
                        return;
                    iterator.stepBackward();
                }
            }
            
            if (/^\s*>/.test(session.getLine(position.row).slice(position.column)))
                return;
            while (!is(token, "tag-name")) {
                token = iterator.stepBackward();
                if (token.value == "<") {
                    token = iterator.stepForward();
                    break;
                }
            }

            var tokenRow = iterator.getCurrentTokenRow();
            var tokenColumn = iterator.getCurrentTokenColumn();
            if (is(iterator.stepBackward(), "end-tag-open"))
                return;

            var element = token.value;
            if (tokenRow == position.row)
                element = element.substring(0, position.column - tokenColumn);

            if (this.voidElements.hasOwnProperty(element.toLowerCase()))
                 return;

            return {
               text: ">" + "</" + element + ">",
               selection: [1, 1]
            };
        }
    });

    this.add("autoindent", "insertion", function (state, action, editor, session, text) {
        if (text == "\n") {
            var cursor = editor.getCursorPosition();
            var line = session.getLine(cursor.row);
            var iterator = new TokenIterator(session, cursor.row, cursor.column);
            var token = iterator.getCurrentToken();

            if (token && token.type.indexOf("tag-close") !== -1) {
                if (token.value == "/>")
                    return;
                while (token && token.type.indexOf("tag-name") === -1) {
                    token = iterator.stepBackward();
                }

                if (!token) {
                    return;
                }

                var tag = token.value;
                var row = iterator.getCurrentTokenRow();
                token = iterator.stepBackward();
                if (!token || token.type.indexOf("end-tag") !== -1) {
                    return;
                }

                if (this.voidElements && !this.voidElements[tag]) {
                    var nextToken = session.getTokenAt(cursor.row, cursor.column+1);
                    var line = session.getLine(row);
                    var nextIndent = this.$getIndent(line);
                    var indent = nextIndent + session.getTabString();

                    if (nextToken && nextToken.value === "</") {
                        return {
                            text: "\n" + indent + "\n" + nextIndent,
                            selection: [1, indent.length, 1, indent.length]
                        };
                    } else {
                        return {
                            text: "\n" + indent
                        };
                    }
                }
            }
        }
    });

};