variabletypenode.java

是有关解释器的.用JAVA编写.可以解释一般的JAVA程序.

class VariableTypeNode extends EvaluatableNode
{
	String vVariableType;
	static VariableTypeNode parserVariableType(Environment env, Scanner s) throws ParserException, ScannerException
	{
		String tmpVariableType= new String();
		if(mIsVariableType(s))
		   tmpVariableType = matchKeyword(s);
		else parserError(s.token(),"VariableType indentifier expected");
		return new VariableTypeNode(tmpVariableType);
	}
	static boolean mIsVariableType(Scanner s)throws ScannerException
	{
		return (isKeywordToken(s,"boolean"))||(isKeywordToken(s,"int"))||
			   (isKeywordToken(s,"direction"))||(isKeywordToken(s,"Robot"));		
	}
	VariableTypeNode()
	{
		vVariableType = null;
	}
	VariableTypeNode(String aVariableType)
	{
		vVariableType = aVariableType;
	}
	String format(int indent)
	{
		return vVariableType;
	}
	Value evaluate(Environment env) throws InterpreterException
	{
		return null;
	}
}