| package jp.ac.kobe_u.cs.prolog.builtin; |
| import jp.ac.kobe_u.cs.prolog.lang.*; |
| /** |
| * <code>atom_concat/3</code><br> |
| * @author Mutsunori Banbara (banbara@kobe-u.ac.jp) |
| * @author Naoyuki Tamura (tamura@kobe-u.ac.jp) |
| * @version 1.0 |
| */ |
| public class PRED_atom_concat_3 extends Predicate { |
| static SymbolTerm AC_2 = SymbolTerm.makeSymbol("ac", 2); |
| public Term arg1, arg2, arg3; |
| |
| public PRED_atom_concat_3(Term a1, Term a2, Term a3, Predicate cont) { |
| arg1 = a1; |
| arg2 = a2; |
| arg3 = a3; |
| this.cont = cont; |
| } |
| |
| public PRED_atom_concat_3(){} |
| |
| public void setArgument(Term[] args, Predicate cont) { |
| arg1 = args[0]; |
| arg2 = args[1]; |
| arg3 = args[2]; |
| this.cont = cont; |
| } |
| |
| public int arity() { return 3; } |
| |
| public String toString() { |
| return "atom_concat(" + arg1 + "," + arg2 + "," + arg3 + ")"; |
| } |
| |
| public Predicate exec(Prolog engine) { |
| engine.setB0(); |
| Term a1, a2, a3; |
| a1 = arg1; |
| a2 = arg2; |
| a3 = arg3; |
| |
| a3 = a3.dereference(); |
| if (a3.isSymbol()) { |
| String str3 = ((SymbolTerm)a3).name(); |
| int endIndex = str3.length(); |
| Term t = Prolog.Nil; |
| for (int i=0; i<=endIndex; i++) { |
| Term[] args = {SymbolTerm.makeSymbol(str3.substring(0, i)), |
| SymbolTerm.makeSymbol(str3.substring(i, endIndex))}; |
| t = new ListTerm(new StructureTerm(AC_2, args), t); |
| } |
| Term[] args12 = {a1,a2}; |
| return new PRED_$member_in_reverse_2(new StructureTerm(AC_2, args12), t, cont); |
| } else if (! a3.isVariable()) { |
| throw new IllegalTypeException(this, 3, "atom", a3); |
| } |
| // a3 is a variable |
| a1 = a1.dereference(); |
| a2 = a2.dereference(); |
| if (a1.isVariable()) |
| throw new PInstantiationException(this, 1); |
| if (a2.isVariable()) |
| throw new PInstantiationException(this, 2); |
| if (! a1.isSymbol()) |
| throw new IllegalTypeException(this, 1, "integer", a1); |
| if (! a2.isSymbol()) |
| throw new IllegalTypeException(this, 2, "integer", a2); |
| String str3 = ((SymbolTerm) a1).name().concat(((SymbolTerm) a2).name()); |
| if (! a3.unify(SymbolTerm.makeSymbol(str3), engine.trail)) |
| return engine.fail(); |
| return cont; |
| } |
| } |