public IOperand CompileConstant([NotNull] ZilObject expr, AmbiguousConstantMode mode)
{
switch (expr.Unwrap(Context))
{
case ZilFix fix:
return(Game.MakeOperand(fix.Value));
case ZilHash hash when hash.StdTypeAtom == StdAtom.BYTE && hash.GetPrimitive(Context) is ZilFix fix:
return(Game.MakeOperand(fix.Value));
case ZilWord word:
return(CompileConstant(word.Value));
case ZilString str:
return(Game.MakeOperand(TranslateString(str, Context)));
case ZilChar ch:
return(Game.MakeOperand((byte)ch.Char));
case ZilAtom atom:
if (atom.StdAtom == StdAtom.T)
{
return(Game.One);
}
if (Routines.TryGetValue(atom, out var routine))
{
return(routine);
}
if (Objects.TryGetValue(atom, out var obj))
{
return(obj);
}
if (Constants.TryGetValue(atom, out var operand))
{
return(operand);
}
if (mode == AmbiguousConstantMode.Optimistic && Globals.TryGetValue(atom, out var global))
{
Context.HandleError(new CompilerError((ISourceLine)null,
CompilerMessages.Bare_Atom_0_Interpreted_As_Global_Variable_Index, atom));
return(global);
}
return(null);
case ZilFalse _:
return(Game.Zero);
case ZilTable table:
if (Tables.TryGetValue(table, out var tb))
{
return(tb);
}
tb = Game.DefineTable(table.Name, true);
Tables.Add(table, tb);
return(tb);
case ZilConstant constant:
return(CompileConstant(constant.Value));
case ZilForm form:
return(form.IsGVAL(out var globalAtom) ? CompileConstant(globalAtom, AmbiguousConstantMode.Pessimistic) : null);
case ZilHash hash when hash.StdTypeAtom == StdAtom.VOC && hash.GetPrimitive(Context) is ZilAtom primAtom:
var wordAtom = ZilAtom.Parse("W?" + primAtom.Text, Context);
if (Constants.TryGetValue(wordAtom, out operand))
{
return(operand);
}
return(null);
default:
var primitive = expr.GetPrimitive(Context);
if (primitive != expr && primitive.GetTypeAtom(Context) != expr.GetTypeAtom(Context))
{
return(CompileConstant(primitive));
}
return(null);
}
}