org.codehaus.mojo.natives.parser.AbstractParser Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of maven-native-api Show documentation
The newest version!
package org.codehaus.mojo.natives.parser;

/*
 *
 * Copyright 2001-2004 The Ant-Contrib project
 *
 *  Licensed 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.
 */

import java.io.IOException;
import java.io.Reader;

/**
 * An abstract base class for simple parsers
 *
 * @author Curt Arnold
 */
public abstract class AbstractParser
{

    protected AbstractParser()
    {
    }

    protected abstract void addFilename( String filename );

    public abstract AbstractParserState getNewLineState();

    protected void parse( Reader reader )
        throws IOException
    {
        char[] buf = new char[4096];
        AbstractParserState newLineState = getNewLineState();
        AbstractParserState state = newLineState;
        int charsRead = -1;

        do
        {
            charsRead = reader.read( buf, 0, buf.length );
            if ( state == null )
            {
                for ( int i = 0; i < charsRead; i++ )
                {
                    if ( buf[i] == '\n' )
                    {
                        state = newLineState;
                        break;
                    }
                }
            }

            if ( state != null )
            {
                for ( int i = 0; i < charsRead; i++ )
                {
                    state = state.consume( buf[i] );
                    //
                    // didn't match a production, skip to a new line
                    //
                    if ( state == null )
                    {
                        for ( ; i < charsRead; i++ )
                        {
                            if ( buf[i] == '\n' )
                            {
                                state = newLineState;
                                break;
                            }
                        }
                    }
                }
            }

        }
        while ( charsRead >= 0 );
    }
}