| package jp.ac.kobe_u.cs.prolog.builtin; |
| import jp.ac.kobe_u.cs.prolog.lang.*; |
| /** |
| * <code>'$call_closure'/1</code><br> |
| * @author Mutsunori Banbara (banbara@kobe-u.ac.jp) |
| * @author Naoyuki Tamura (tamura@kobe-u.ac.jp) |
| * @version 1.0 |
| */ |
| class PRED_$call_closure_1 extends Predicate { |
| Term arg1; |
| Predicate cont; |
| |
| public PRED_$call_closure_1(Term a1, Predicate cont) { |
| arg1 = a1; |
| this.cont = cont; |
| } |
| |
| public PRED_$call_closure_1() {} |
| |
| public void setArgument(Term args[], Predicate cont) { |
| arg1 = args[0]; |
| this.cont = cont; |
| } |
| |
| public int arity() { return 1; } |
| |
| public String toString() { |
| return "$call_closure(" + arg1 + ")"; |
| } |
| |
| public Predicate exec(Prolog engine) { |
| engine.setB0(); |
| Term a1; |
| Predicate code; |
| |
| // a1 must be closure |
| a1 = arg1.dereference(); |
| |
| if (! a1.isClosure()) |
| return engine.fail(); |
| code = ((ClosureTerm) a1).getCode(); |
| code.cont = this.cont; |
| return code; |
| } |
| } |
| |
| |