languages.manifest/src/org/netbeans/modules/languages/manifest/MfLexer.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.manifest;

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


/**
 *
 * @author Jan Jancura
 */
class MfLexer implements Lexer<MfTokenId> {

    private LexerRestartInfo<MfTokenId> info;
    private int                         state = 0;

    MfLexer (LexerRestartInfo<MfTokenId> info) {
        this.info = info;
        if (info.state () != null)
            state = (Integer) info.state ();
    }

    public Token<MfTokenId> nextToken () {
        LexerInput input = info.input ();
        if (state == 0) {
            int i = input.read ();
            if (i == '#') {
                do {
                    i = input.read ();
                } while (
                    i != '\n' &&
                    i != '\r' &&
                    i != LexerInput.EOF
                );
                do {
                    i = input.read ();
                } while (
                    i == '\n' ||
                    i == '\r'
                );
                input.backup (1);
                state = 0;
                return info.tokenFactory ().createToken (MfTokenId.COMMENT);
            }
            if (i == ':')
                i = input.read ();
            while (
                i != '\n' &&
                i != '\r' &&
                i != ':' &&
                i != LexerInput.EOF
            )
                i = input.read ();
            if (i == '\n' || i == '\r')
                do {
                    i = input.read ();
                } while (
                    i == '\n' ||
                    i == '\r'
                );
            if (i != LexerInput.EOF)
                input.backup (1);
            state = i == ':' ? 1 : 0;
            if (input.readLength() == 0) return null;
            return info.tokenFactory ().createToken (MfTokenId.KEYWORD);
        }
        if (state == 1) {
            input.read ();
            state = 2;
            return info.tokenFactory ().createToken (MfTokenId.OPERATOR);
        }
        int i = 0;
        do {
            i = input.read ();
            while (
                i != '\n' &&
                i != '\r' &&
                i != LexerInput.EOF
            )
                i = input.read ();
            do {
                i = input.read ();
            } while (
                i == '\n' ||
                i == '\r'
            );
        } while (i == ' ');
        if (i != LexerInput.EOF)
            input.backup (1);
        state = 0;
        if (input.readLength() == 0) return null;
        return info.tokenFactory ().createToken (MfTokenId.IDENTIFIER);
    }

    public Object state () {
        return state;
    }

    public void release () {
    }
}