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/*
* NameRule.java
*
* comments here.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1998 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package io.devnulllabs.openjava.syntax;
import io.devnulllabs.openjava.ptree.ParseTree;
import io.devnulllabs.openjava.ptree.Variable;
import io.devnulllabs.openjava.tools.parser.Token;
/**
* The interface <code>NameRule</code>
* <p>
* For example
* <pre>
* </pre>
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: NameRule.java,v 1.2 2003/02/19 02:54:31 tatsubori Exp $
* @see java.lang.Object
*/
public class NameRule extends AbstractSyntaxRule
{
/**
* Consumes a dot-separated name like <tt>java.lang.String</tt>.
*
* @param token_src token source
* @return a dummy <code>Variable</code> object.
* @see io.devnulllabs.openjava.ptree.Variable
*/
public final ParseTree consume( TokenSource token_src )
throws SyntaxException
{
return consumeQualifiedName( token_src );
}
/**
* To override for modifying rule.
*/
public Variable consumeQualifiedName( TokenSource token_src )
throws SyntaxException
{
IdentifierRule rule = new IdentifierRule();
Variable ident = rule.consumeIdentifier( token_src );
StringBuffer buf = new StringBuffer( ident.toString() );
while (lookaheadRest( token_src )) {
buf.append( token_src.getNextToken().image ); /* DOT */
buf.append( token_src.getNextToken().image ); /* IDENTIFIER */
}
return new Variable( buf.toString() );
}
/**
* A hard-coded lookahead for performance reason.
* (. <IDENTIFIER>)
*/
protected static final boolean lookaheadRest( TokenSource token_src ) {
Token t1 = token_src.getToken( 1 );
Token t2 = token_src.getToken( 2 );
return (t1.kind == DOT && t2.kind == IDENTIFIER);
}
}
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