/*
 * CatchCmd.java
 *
 * Copyright (c) 1997 Cornell University.
 * Copyright (c) 1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and
 * redistribution of this file, and for a DISCLAIMER OF ALL
 * WARRANTIES.
 * 
 * RCS: @(#) $Id: CatchCmd.java,v 1.1.1.1 1998/10/14 21:09:18 cvsadmin Exp $
 *
 */

package tcl.lang;

/**
 * This class implements the built-in "catch" command in Tcl.
 */

class CatchCmd implements Command {
    /**
     * This procedure is invoked to process the "catch" Tcl command.
     * See the user documentation for details on what it does.
     *
     * @param interp the current interpreter.
     * @param argv command arguments.
     * @exception TclException if wrong number of arguments.
     */

    public void cmdProc(Interp interp, TclObject argv[])
	    throws TclException {
	if (argv.length != 2 && argv.length != 3) {
	    throw new TclNumArgsException(interp, 1, argv, 
		    "command ?varName?");
	}

	TclObject result;
	int code = TCL.OK;

	try {
	    interp.eval(argv[1], 0);
	} catch (TclException e) {
	    code = e.getCompletionCode();
	}

	result = interp.getResult();

	if (argv.length == 3) {
	    try {
		interp.setVar(argv[2], result, 0);
	    } catch (TclException e) {
		throw new TclException(interp,
			"couldn't save command result in variable");
	    }
	}

	interp.setResult(TclInteger.newInstance(code));
    }
}