/// <summary>
/// Yield an expression that is 'inexpr' with 'var' replaced by 'subst'.
/// </summary>
/// <param name="subst">The expression to substitute.</param>
/// <param name="var">The variable to substitute for.</param>
/// <param name="inexpr">The expression to substitute into.</param>
public static IExpr /*!*/ Substitute(IExpr /*!*/ subst, IVariable /*!*/ var, IExpr /*!*/ inexpr)
{
Contract.Requires(inexpr != null);
Contract.Requires(var != null);
Contract.Requires(subst != null);
Contract.Ensures(Contract.Result <IExpr>() != null);
IExpr result = null;
if (inexpr is IVariable)
{
result = inexpr.Equals(var) ? subst : inexpr;
}
else if (inexpr is IFunApp)
{
IFunApp /*!*/ funapp = (IFunApp /*!*/)cce.NonNull(inexpr);
IList newargs = null;
var x = new System.Collections.Generic.List <IExpr>();
foreach (IExpr arg in funapp.Arguments)
{
x.Add(Substitute(subst, var, arg));
}
newargs = new ArrayList(x);
//newargs = new ArrayList{ IExpr/*!*/ arg in funapp.Arguments; Substitute(subst, var, arg) };
result = funapp.CloneWithArguments(newargs);
}
else if (inexpr is IFunction)
{
IFunction /*!*/ fun = (IFunction /*!*/)cce.NonNull(inexpr);
if (fun.Param.Equals(var))
{
result = fun;
}
else
{
result = fun.CloneWithBody(Substitute(subst, var, fun.Body));
}
}
else if (inexpr is IUnknown)
{
result = inexpr;
}
else
{
{ Contract.Assert(false); throw new cce.UnreachableException(); }
}
return(result);
}
/// <summary>
/// Yield an expression that is 'inexpr' with 'var' replaced by 'subst'.
/// </summary>
/// <param name="subst">The expression to substitute.</param>
/// <param name="var">The variable to substitute for.</param>
/// <param name="inexpr">The expression to substitute into.</param>
public static IExpr/*!*/ Substitute(IExpr/*!*/ subst, IVariable/*!*/ var, IExpr/*!*/ inexpr){
Contract.Requires(inexpr != null);
Contract.Requires(var != null);
Contract.Requires(subst != null);
Contract.Ensures(Contract.Result<IExpr>() != null);
IExpr result = null;
if (inexpr is IVariable)
{
result = inexpr.Equals(var) ? subst : inexpr;
}
else if (inexpr is IFunApp)
{
IFunApp/*!*/ funapp = (IFunApp/*!*/)cce.NonNull(inexpr);
IList newargs = null;
var x = new System.Collections.Generic.List<IExpr>();
foreach (IExpr arg in funapp.Arguments){
x.Add(Substitute(subst,var, arg));
}
newargs = new ArrayList(x);
//newargs = new ArrayList{ IExpr/*!*/ arg in funapp.Arguments; Substitute(subst, var, arg) };
result = funapp.CloneWithArguments(newargs);
}
else if (inexpr is IFunction)
{
IFunction/*!*/ fun = (IFunction/*!*/)cce.NonNull(inexpr);
if (fun.Param.Equals(var))
result = fun;
else
result = fun.CloneWithBody(Substitute(subst, var, fun.Body));
}
else if (inexpr is IUnknown)
{
result = inexpr;
}
else
{
{Contract.Assert(false);throw new cce.UnreachableException();}
}
return result;
}