public IFormula visit(ExistentialFormula f)
{
if (f.f is Or)
{
var c = f.f as Or;
var i1 = c.f1.ffreeVariables.Contains(f.var);
var i2 = c.f2.ffreeVariables.Contains(f.var);
if (i1 && i2)
{
var newVar = srs.getFreshVariable(f.var);
var ns = new Substitution(f.var, new Variable(newVar));
return(new Or(
new ExistentialFormula(f.var, c.f1, f.attributes, f.triggers).visit(this),
new ExistentialFormula(newVar, c.f2.substitute(ns), f.attributes, from ts in f.triggers select from t in ts select t.substitute(ns)).visit(
this)
));
}
else if (i1)
{
return(new Or(new ExistentialFormula(f.var, c.f1, f.attributes, f.triggers).visit(this), c.f2.visit(this)));
}
else if (i2)
{
return(new Or(c.f1.visit(this), new ExistentialFormula(f.var, c.f2, f.attributes, f.triggers).visit(this)));
}
else
{
return(c.visit(this));
}
}
else if (f.f is And)
{
var c = f.f as And;
var i1 = c.f1.ffreeVariables.Contains(f.var);
var i2 = c.f2.ffreeVariables.Contains(f.var);
if (i1 && i2)
{
return(new ExistentialFormula(f.var, f.f.visit(this), f.attributes, f.triggers));
}
else if (i1)
{
return(new And(new ExistentialFormula(f.var, c.f1, f.attributes, f.triggers).visit(this), c.f2.visit(this)));
}
else if (i2)
{
return(new And(c.f1.visit(this), new ExistentialFormula(f.var, c.f2, f.attributes, f.triggers).visit(this)));
}
else
{
return(c.visit(this));
}
}
else
{
return(new ExistentialFormula(f.var, f.f.visit(this), f.attributes, f.triggers));
}
}
public IFormula visit(ExistentialFormula f)
{
var fvs = (from fv in f.f.ffreeVariables where fv != f.var select fv).ToArray();
var fvts = TypeTuple.make(from fv in fvs select fv.type);
var newF = srs.getFreshFunction("@sk", fvts, f.var.type);
var fvTerms = (from fv in fvs select new Variable(fv)).ToArray <ITerm>();
return(f.f.substitute(new Substitution(f.var, new FunctionApplicationFormula(newF, fvTerms))).visit(this));
}
public IFormula visit(ExistentialFormula f)
{
return(new UniversalFormula(f.var, f.f.visit(n), f.attributes, f.triggers));
}
public IFormula visit(ExistentialFormula f)
{
var nf = f.f.visit(this);
return(!nf.ffreeVariables.Contains(f.var) ? nf : new ExistentialFormula(f.var, nf, f.attributes, f.triggers));
}
