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Groovy: A powerful, dynamic language for the JVM
There is a newer version: 3.0.22
/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package groovy.ui.text;

import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;
import javax.swing.text.Segment;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;


/**
 * @author Evan "Hippy" Slatis
 */
public class GroovyFilter extends StructuredSyntaxDocumentFilter {

    // java tab policy action
    private static final Action AUTO_TAB_ACTION = new AutoTabAction();

    // Style names
    public static final String COMMENT = "comment";
    public static final String SLASH_STAR_COMMENT = "/\\*(?s:.)*?(?:\\*/|\\z)";
    public static final String SLASH_SLASH_COMMENT = "//.*";

    public static final String QUOTES =
            "(?ms:\"{3}.*?(?:\"{3}|\\z))|(?:\"{1}.*?(?:\"|\\Z))";

    public static final String SINGLE_QUOTES =
            "(?ms:'{3}(?!'{1,3}).*?(?:'{3}|\\z))|(?:'{1}.*?(?:'|\\z))";

    public static final String SLASHY_QUOTES = "(?:/[^/*].*?(? -1) {
                    for (int i = 0; i < index + 4; i++) {
                        buffer.append(' ');
                    }
                }
                try {
                    doc.insertString(offset, buffer.toString(),
                            doc.getDefaultRootElement().getAttributes());
                }
                catch (BadLocationException ble) {
                    ble.printStackTrace();
                }
            }
        }

        public int findTabLocation(int offset) {

            // find first {
            boolean cont = true;
            while (offset > -1 && cont) {
                Element el = doc.getCharacterElement(offset);
                Object color =
                        el.getAttributes().getAttribute(StyleConstants.Foreground);
                if (!COMMENT_COLOR.equals(color)) {
                    cont = segment.array[offset] != '{' &&
                            segment.array[offset] != '}';
                }
                offset -= cont ? 1 : 0;
            }

            if (offset > -1 && segment.array[offset] == '{') {
                while (offset > -1 &&
                        !Character.isWhitespace(segment.array[offset--])) {
                }
            }

            int index = offset < 0 || segment.array[offset] == '}' ? -4 : 0;
            if (offset > -1) {
                Element top = doc.getDefaultRootElement();
                offset = top.getElement(top.getElementIndex(offset)).getStartOffset();

                while (Character.isWhitespace(segment.array[offset++])) {
                    index++;
                }
            }

            return index;
        }
    }
}