Method eval

src/bsh/BSHTryStatement.java:40–186

( CallStack callstack, Interpreter interpreter)

	}

	public Object eval( CallStack callstack, Interpreter interpreter)  
		throws EvalError
	{
		BSHBlock tryBlock = ((BSHBlock)jjtGetChild(0));

		List<BSHFormalParameter> catchParams = new ArrayList<BSHFormalParameter>();
		List<BSHBlock> catchBlocks = new ArrayList<BSHBlock>();

		int nchild = jjtGetNumChildren();
		Node node = null;
		int i=1;
		while((i < nchild) && ((node = jjtGetChild(i++)) instanceof BSHFormalParameter))
		{
			catchParams.add((BSHFormalParameter)node);
			catchBlocks.add((BSHBlock)jjtGetChild(i++));
			node = null;
		}
		// finally block
		BSHBlock finallyBlock = null;
		if(node != null)
			finallyBlock = (BSHBlock)node;

// Why both of these?

		TargetError target = null;
		Throwable thrown = null;
		Object ret = null;

		/*
			Evaluate the contents of the try { } block and catch any resulting
			TargetErrors generated by the script.
			We save the callstack depth and if an exception is thrown we pop
			back to that depth before contiuing.  The exception short circuited
			any intervening method context pops.

			Note: we the stack info... what do we do with it?  append
			to exception message?
		*/
		int callstackDepth = callstack.depth();
		try {
			ret = tryBlock.eval(callstack, interpreter);
		}
		catch( TargetError e ) {
			target = e;
			String stackInfo = "Bsh Stack: ";
			while ( callstack.depth() > callstackDepth )
				stackInfo += "\t" + callstack.pop() +"\n";
		}

		// unwrap the target error
		if ( target != null )
			thrown = target.getTarget();


		// If we have an exception, find a catch
		try {
			if (thrown != null)
			{