1 ////////////////////////////////////////////////////////////////////////////////
2 // MillScript: an Open Spice interpreter and batch website creation tool
3 // Copyright (C) 2001-2004 Open World Ltd
4 //
5 // This file is part of MillScript.
6 //
7 // MillScript is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU General Public License as published by the Free
9 // Software Foundation; either version 2 of the License, or (at your option)
10 // any later version.
11 //
12 // MillScript is distributed in the hope that it will be useful, but WITHOUT
13 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 // more details.
16 //
17 // You should have received a copy of the GNU General Public License along with
18 // MillScript; if not, write to the Free Software Foundation, Inc., 59 Temple
19 // Place, Suite 330, Boston, MA 02111-1307 USA
20 ////////////////////////////////////////////////////////////////////////////////
21 package org.millscript.millscript.functions;
22
23 import org.millscript.millscript.tools.FormatPrint;
24 import org.millscript.millscript.vm.Machine;
25
26 import java.io.PrintWriter;
27
28 /**
29 * This class implements the basic functionality required for MillScript's
30 * <code>show</code> functions.
31 */
32 abstract class BasicShowFunction extends Function {
33
34 /**
35 * Performs the basic show function. The basic show function consists of
36 * displaying the specified number of arguments from the specified machine
37 * in a programmer oriented fashion.
38 *
39 * @param mc the machine to obtain arguments from
40 * @param nargs the number of arguments to get
41 * @param newline indicates whether a newline should be displayed after
42 * everything is shown
43 */
44 protected void basicApply( final Machine mc, final int nargs, final boolean newline ) {
45 if ( nargs == 1 ) {
46 final PrintWriter pw = new PrintWriter( System.out, true );
47 FormatPrint.show( pw, mc.popObject() );
48 if ( newline ) {
49 pw.println( "" );
50 } else {
51 pw.flush();
52 }
53 } else {
54 checkNargs( mc, 1, nargs );
55 }
56 }
57
58 }