/*
	ShogiInputStream.java
	
	a stream filter for ascii shogi data files
	97-feb-26 ped created
*/


import java.io.* ;


public class ShogiInputStream implements Enum_PGNTokens
{
	private PushbackInputStream is ;
	private	String				str ;
	
	ShogiInputStream( InputStream is )
	{
		this.is = new PushbackInputStream( is ) ;
	}
	
	public int nextToken( )
	{
		str = new String( ) ;
		int	ch ;

		try {
			do {
				ch = is.read( ) ;

				switch( ch ) {

					case '[' :		//	game comment
						ch = is.read( ) ;
						while( ch != -1 && ch != ']' ) {
							str += ( char ) ch ;
							ch = is.read( ) ;
						}
						return CTT_GAME_COMMENT ;

					case '{' :		//	move comment
						ch = is.read( ) ;
						while( ch != -1 && ch != '}' ) {
							if( Character.isSpace( ( char ) ch ) ) {
								if( ch == ' ' || ! str.endsWith( " " ) )
									str += ' ' ;
							} else
								str += ( char ) ch ;
							ch = is.read( ) ;
						}
						return CTT_MOVE_COMMENT ;

					case '(' :		//	variation
						return CTT_VARIATION_OPEN ;
					
					case ')' :		//	end of variation
						return CTT_VARIATION_CLOSE ;
					
				}

			} while( ch != -1 && Character.isSpace( ( char ) ch ) ) ;

			while( ch != -1	&& ! Character.isSpace( ( char ) ch ) ) {
				str += ( char ) ch ;
				ch = is.read( ) ;

				if( ch == ')' ) {
					is.unread( ch ) ;
					break ;
				}
			}
		}
		catch( IOException e ) {
		}

		if( str.length( ) == 0 )
			return CTT_EOF ;

		if( str.equals( "1-0" ) || str.equals( "0-1" ) || str.equals( "1/2-1/2" ) || str.equals( "*" ) )
			return CTT_EOG ;

		if( Character.isDigit( str.charAt( 0 ) ) )
			return CTT_MOVE_NUMBER ;

		return CTT_MOVE ;
	}

	public String getString( )
	{
		return str ;
	}
}