java/languages.antlr/src/org/netbeans/modules/languages/antlr/AntlrDeletedTextInterceptor.java

/*
 * 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 org.netbeans.modules.languages.antlr;

import javax.swing.text.BadLocationException;
import org.netbeans.api.editor.mimelookup.MimePath;
import org.netbeans.api.editor.mimelookup.MimeRegistration;
import org.netbeans.spi.editor.typinghooks.DeletedTextInterceptor;

/**
 *
 * @author lkishalmi
 */
public final class AntlrDeletedTextInterceptor implements DeletedTextInterceptor {

    @Override
    public boolean beforeRemove(Context context) throws BadLocationException {
        return false;
    }

    @Override
    public void remove(Context context) throws BadLocationException {
        if (context.isBackwardDelete()) {
            String txt = context.getText();
            int nextCharOffset = context.getOffset() - 1;
            String after = context.getDocument().getText(nextCharOffset, 1);
            if (("[".equals(txt) && "]".equals(after))
                    || ("{".equals(txt) && "}".equals(after))
                    || ("'".equals(txt) && "'".equals(after))) {
                context.getDocument().remove(nextCharOffset, 1);
            }
        }
    }

    @Override
    public void afterRemove(Context context) throws BadLocationException {
    }

    @Override
    public void cancelled(Context context) {
    }

    @MimeRegistration(mimeType = AntlrTokenId.MIME_TYPE, service = DeletedTextInterceptor.Factory.class)
    public static class TomlDeletedTextInterceptorFactory implements DeletedTextInterceptor.Factory {

        @Override
        public DeletedTextInterceptor createDeletedTextInterceptor(MimePath mimePath) {
            return new AntlrDeletedTextInterceptor();
        }

    }

}