package jp.ac.kobe_u.cs.prolog.builtin;
import jp.ac.kobe_u.cs.prolog.lang.Arithmetic;
import jp.ac.kobe_u.cs.prolog.lang.BuiltinException;
import jp.ac.kobe_u.cs.prolog.lang.IntegerTerm;
import jp.ac.kobe_u.cs.prolog.lang.ListTerm;
import jp.ac.kobe_u.cs.prolog.lang.Predicate;
import jp.ac.kobe_u.cs.prolog.lang.Prolog;
import jp.ac.kobe_u.cs.prolog.lang.SymbolTerm;
import jp.ac.kobe_u.cs.prolog.lang.Term;
import jp.ac.kobe_u.cs.prolog.lang.VariableTerm;
/*
This file is generated by Prolog Cafe.
PLEASE DO NOT EDIT!
*/
/**
<code>'$length'/3</code> defined in builtins.pl<br>
@author Mutsunori Banbara (banbara@kobe-u.ac.jp)
@author Naoyuki Tamura (tamura@kobe-u.ac.jp)
@version 1.0
*/
class PRED_$length_3 extends Predicate {
static SymbolTerm s1 = SymbolTerm.makeSymbol("[]");
static IntegerTerm si2 = new IntegerTerm(1);
static Predicate _$length_3_top = new PRED_$length_3_top();
static Predicate _fail_0 = new PRED_fail_0();
static Predicate _$length_3_var = new PRED_$length_3_var();
static Predicate _$length_3_var_1 = new PRED_$length_3_var_1();
static Predicate _$length_3_1 = new PRED_$length_3_1();
static Predicate _$length_3_2 = new PRED_$length_3_2();
public Term arg1, arg2, arg3;
public PRED_$length_3(Term a1, Term a2, Term a3, Predicate cont) {
arg1 = a1;
arg2 = a2;
arg3 = a3;
this.cont = cont;
}
public PRED_$length_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 "$length(" + arg1 + "," + arg2 + "," + arg3 + ")";
}
public Predicate exec(Prolog engine) {
engine.aregs[1] = arg1;
engine.aregs[2] = arg2;
engine.aregs[3] = arg3;
engine.cont = cont;
return _$length_3_top;
}
}
class PRED_$length_3_top extends PRED_$length_3 {
public Predicate exec(Prolog engine) {
engine.setB0();
return engine.switch_on_term(_$length_3_var, _fail_0, _fail_0, _$length_3_1, _fail_0, _$length_3_2);
}
}
class PRED_$length_3_var extends PRED_$length_3 {
public Predicate exec(Prolog engine) {
return engine.jtry(_$length_3_1, _$length_3_var_1);
}
}
class PRED_$length_3_var_1 extends PRED_$length_3 {
public Predicate exec(Prolog engine) {
return engine.trust(_$length_3_2);
}
}
class PRED_$length_3_1 extends PRED_$length_3 {
public Predicate exec(Prolog engine) {
// '$length'([],A,A):-true
Term a1, a2, a3;
Predicate cont;
a1 = engine.aregs[1];
a2 = engine.aregs[2];
a3 = engine.aregs[3];
cont = engine.cont;
// '$length'([],A,A):-[]
a1 = a1.dereference();
if (a1.isSymbol()){
if (! a1.equals(s1))
return engine.fail();
} else if (a1.isVariable()){
((VariableTerm) a1).bind(s1, engine.trail);
} else {
return engine.fail();
}
if (! a2.unify(a3, engine.trail))
return engine.fail();
return cont;
}
}
class PRED_$length_3_2 extends PRED_$length_3 {
public Predicate exec(Prolog engine) {
// '$length'([A|B],C,D):-E is C+1,'$length'(B,E,D)
Term a1, a2, a3, a4, a5;
Predicate cont;
a1 = engine.aregs[1];
a2 = engine.aregs[2];
a3 = engine.aregs[3];
cont = engine.cont;
// '$length'([A|B],C,D):-['$plus'(C,1,E),'$length'(B,E,D)]
a1 = a1.dereference();
if (a1.isList()){
Term[] args = {((ListTerm)a1).car(), ((ListTerm)a1).cdr()};
a4 = args[1];
} else if (a1.isVariable()){
a4 = new VariableTerm(engine);
((VariableTerm) a1).bind(new ListTerm(new VariableTerm(engine), a4), engine.trail);
} else {
return engine.fail();
}
a5 = new VariableTerm(engine);
//START inline expansion of $plus(a(2),si(2),a(5))
try {
if (! a5.unify(Arithmetic.evaluate(a2).add(si2), engine.trail)) {
return engine.fail();
}
} catch (BuiltinException e) {
e.goal = this;
throw e;
}
//END inline expansion
engine.aregs[1] = a4;
engine.aregs[2] = a5;
engine.aregs[3] = a3;
engine.cont = cont;
return _$length_3_top;
}
}