/// <exception cref="InterpreterError">The DECL syntax is invalid.</exception>
public IEnumerable <KeyValuePair <ZilAtom, ZilObject> > GetAtomDeclPairs()
{
ZilListoidBase list = this;
while (!list.IsEmpty)
{
if (!list.StartsWith(out ZilList atoms, out ZilObject decl))
{
break;
}
if (!atoms.All(a => a is ZilAtom))
{
break;
}
foreach (var zo in atoms)
{
var atom = (ZilAtom)zo;
yield return(new KeyValuePair <ZilAtom, ZilObject>(atom, decl));
}
list = list.GetRest(2);
Debug.Assert(list != null);
}
if (!list.IsEmpty)
{
throw new InterpreterError(InterpreterMessages.Malformed_DECL_Object);
}
}
public void Deconstruct([NotNull] out ZilObject first, [NotNull] out ZilListoidBase rest)
{
if (IsEmpty)
{
throw new InvalidOperationException("Cannot deconstruct an empty list");
}
Debug.Assert(this.First != null && this.Rest != null);
first = this.First;
rest = this.Rest;
}
public ZilList(ZilObject first, ZilListoidBase rest)
: base(first, rest)
{
}
public bool IsCons([CanBeNull] out ZilObject first, [CanBeNull] out ZilListoidBase rest)
{
(first, rest) = (this.First, this.Rest);
Debug.Assert(first == null && rest == null || first != null && rest != null);
return(first != null);
}