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/*
 *
 * Copyright 2002-2004 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.
 */
package org.codehaus.mojo.natives.parser;

import java.io.IOException;
import java.io.Reader;
import java.util.Vector;

/**
 * A parser that extracts #include statements from a Reader.
 *
 * @author Adam Murdoch
 * @author Curt Arnold
 */
public final class CParser
    extends AbstractParser
    implements Parser
{
    private final Vector includes = new Vector<>();

    private AbstractParserState newLineState;

    public CParser()
    {
        AbstractParserState quote = new FilenameState( this, new char[] { '"' } );
        AbstractParserState bracket = new FilenameState( this, new char[] { '>' } );
        AbstractParserState postE = new PostE( this, bracket, quote );
        //
        // nclude
        //
        AbstractParserState e = new LetterState( this, 'e', postE, null );
        AbstractParserState d = new LetterState( this, 'd', e, null );
        AbstractParserState u = new LetterState( this, 'u', d, null );
        AbstractParserState l = new LetterState( this, 'l', u, null );
        AbstractParserState c = new LetterState( this, 'c', l, null );
        AbstractParserState n = new LetterState( this, 'n', c, null );
        //
        // mport is equivalent to nclude
        //
        AbstractParserState t = new LetterState( this, 't', postE, null );
        AbstractParserState r = new LetterState( this, 'r', t, null );
        AbstractParserState o = new LetterState( this, 'o', r, null );
        AbstractParserState p = new LetterState( this, 'p', o, null );
        AbstractParserState m = new LetterState( this, 'm', p, null );
        //
        // switch between
        //
        AbstractParserState n_m =
                new BranchState( this, new char[] { 'n', 'm' }, new AbstractParserState[] { n, m }, null );
        AbstractParserState i = new WhitespaceOrLetterState( this, 'i', n_m );
        newLineState = new LetterState( this, '#', i, null );
    }

    @Override
    public void addFilename( String include )
    {
        includes.addElement( include );
    }

    @Override
    public String[] getIncludes()
    {
        String[] retval = new String[includes.size()];

        includes.copyInto( retval );

        return retval;
    }

    @Override
    public AbstractParserState getNewLineState()
    {
        return newLineState;
    }

    @Override
    public void parse( Reader reader )
        throws IOException
    {
        includes.setSize( 0 );

        super.parse( reader );
    }

}