/*=======================================================
* If.java
*
* "A Tcl like language implementation in Java named APWTCL
* ((Java) Arnulf's Preferred Web Tcl)"
*
* APWTCL If class
*
* Released under same BSD license as Tcl.
* (Tcl BSD license found at <http://www.tcl.tk/software/tcltk/license.html>)
*
* Copyright 2012 Arnulf P. Wiedemann
*
*/
package org.apwtcl.lang.cmd;
import java.util.ArrayList;
import org.apwtcl.lang.Interp;
import org.apwtcl.lang.ApwtclObj;
import org.apwtcl.lang.Token;
public class If extends Token {
public If() {
}
public int ifCmd(Interp interp, ArrayList<ApwtclObj> args) {
print("if called!"+args+"!");
int idx = 1;
int retcode;
int current = 1;
int falsebody = 0;
boolean err = false;
int argc = args.size();
if (args.size() >= 3) {
while (true) {
ArrayList<Integer> bool_ptr = new ArrayList<Integer>();
int bool;
/* Far not enough arguments given! */
if (current >= argc) {
err = true;
break;
}
if ((retcode = interp.eval_expression.getBoolFromExpr(args.get(current++), bool_ptr)) != OK) {
return retcode;
}
bool = bool_ptr.get(0);
/* There lacks something, isn't it? */
if (current >= argc) {
err = true;
break;
}
if (args.get(current).getString().equals("then")) {
current++;
}
/* Tsk tsk, no then-clause? */
if (current >= argc) {
err = true;
break;
}
if (bool > 0) {
return interp.eval_statement.evalObj(args.get(current));
}
/* Ok: no else-clause follows */
if (++current >= argc) {
interp.setResult(interp.string_obj_type.newEmptyStringObj("IF_1"));
return OK;
}
falsebody = current++;
if (args.get(falsebody).getString().equals("else")) {
/* IIICKS - else-clause isn't last cmd? */
if (current != argc - 1) {
err = true;
break;
}
return interp.eval_statement.evalObj(args.get(current));
} else {
if (args.get(falsebody).getString().equals("elseif")) {
/* Ok: elseif follows meaning all the stuff
* again (how boring...)
*/
continue;
} else {
/* OOPS - else-clause is not last cmd? */
if (falsebody != argc - 1) {
err = true;
break;
}
return interp.eval_statement.evalObj(args.get(falsebody));
}
}
}
if (!err) {
return OK;
}
}
interp.wrongNumArgs(1, args, "condition ?then? trueBody ?elseif ...? ?else? falseBody");
return ERROR;
}
}