ide/lexer.nbbridge/test/unit/src/org/netbeans/modules/lexer/nbbridge/test/simple/SimpleCharLexer.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.lexer.nbbridge.test.simple;

import org.netbeans.api.lexer.Token;
import org.netbeans.spi.lexer.Lexer;
import org.netbeans.spi.lexer.LexerInput;
import org.netbeans.spi.lexer.LexerRestartInfo;
import org.netbeans.spi.lexer.TokenFactory;

/**
 * Simple implementation a lexer.
 *
 * @author mmetelka
 */
final class SimpleCharLexer implements Lexer<SimpleCharTokenId> {

    private LexerInput input;

    private TokenFactory<SimpleCharTokenId> tokenFactory;

    SimpleCharLexer(LexerRestartInfo<SimpleCharTokenId> info) {
        this.input = info.input();
        this.tokenFactory = info.tokenFactory();
    }
    
    public Token<SimpleCharTokenId> nextToken() {
        int ch = input.read();
        if (ch == LexerInput.EOF) {
            return null;
        } else if (Character.isDigit(ch)) {
            return tokenFactory.createToken(SimpleCharTokenId.DIGIT);
        } else {
            return tokenFactory.createToken(SimpleCharTokenId.CHARACTER);
        }
    }
    
    public Object state() {
        return null; // always in default state after token recognition
    }
    
    public void release() {
    }

}