mainmethodnode.java

是有关解释器的.用JAVA编写.可以解释一般的JAVA程序.

class MainMethodNode extends ExecutableNode
{
	BlockNode vBlockNode;

	static MainMethodNode parserMainMethod(Environment env, Scanner s) throws ParserException, ScannerException
	{
		matchKeyword(s,"void");
		matchIdentifier(s,"task");
		matchBracket(s,'(');
		matchBracket(s,')');
		
		return new MainMethodNode(BlockNode.parserBlock(env,s));		
	}
	static boolean mIsMainMethod(Scanner s) throws ScannerException
	{
		Token t= s.followingToken();
		if(t.isIdentifier())
			return ((IdentifierToken)t).content().equals("task");
		else return false;
	}
	MainMethodNode(BlockNode aBlockNode)
	{
		vBlockNode= aBlockNode;
	}
	MainMethodNode()
	{
		vBlockNode= null;
	}
	String format(int indent)
	{
		return "\nvoid task()\n" + vBlockNode.format(indent);
	}
	Environment run(Environment env) throws InterpreterException
	{		
		if(vBlockNode!=null)env.addAll(vBlockNode.run(env));
		
		return env;
	}
	boolean typeCheck(Environment env) throws InterpreterException
	{		
		ProgramNode.vTopLevelEnvironment.put("returnType", "void");
		if(vBlockNode!=null)
			return vBlockNode.typeCheck(env);		
		return true;
	}
}