bracketedexpressionnode.java

是有关解释器的.用JAVA编写.可以解释一般的JAVA程序.

class BracketedExpressionNode extends EvaluatableNode
{
	OrClauseNode vOrClauseNode;
	
	static BracketedExpressionNode parserBracketedExpression(Environment env, Scanner s) throws ParserException, ScannerException
	{
		OrClauseNode tmpOrClauseNode;
		
		matchBracket(s,'(');
		tmpOrClauseNode= OrClauseNode.parserOrClause(env,s);
		matchBracket(s,')');
		
		return new BracketedExpressionNode(tmpOrClauseNode);
	}
	static boolean mIsBracketedExpression(Scanner s) throws ScannerException
	{
		return isBracketToken(s,'(');
	}
	BracketedExpressionNode(OrClauseNode aOrClauseNode)
	{
		vOrClauseNode= aOrClauseNode;
	}
	BracketedExpressionNode()
	{
		vOrClauseNode= null;
	}
	String format(int indent)
	{
		return "("+vOrClauseNode.format(indent)+")";
	}
	Value evaluate(Environment env) throws InterpreterException
	{
		return vOrClauseNode.evaluate(env);
	}
	boolean typeCheck(Environment env) throws InterpreterException
	{	
		return vOrClauseNode.typeCheck(env);		
	}
}