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/* $Header$ */
/*
* Copyright © 1988-2004 Keith Packard and Bart Massey.
* All Rights Reserved. See the file COPYING in this directory
* for licensing information.
*/
#include "nickle.h"
Value
UnionRef (Value uv, Atom name)
{
ENTER ();
Union *u = &uv->unions;
StructType *st = u->type;
int i;
for (i = 0; i < st->nelements; i++)
if (StructTypeAtoms(st)[i] == name)
{
u->tag = name;
RETURN (NewRef (u->value, 0));
}
RETURN (0);
}
Value
UnionValue (Value uv, Atom name)
{
ENTER ();
Union *u = &uv->unions;
if (u->tag != name)
RETURN (0);
RETURN (BoxValue (u->value, 0));
}
static Bool
UnionPrint (Value f, Value av, char format, int base, int width, int prec, int fill)
{
Union *u = &av->unions;
if (format == 'v')
FileOutput (f, '{');
if (u->tag)
{
Type *t = StructMemType (u->type, u->tag);
FilePuts (f, AtomName (u->tag));
if (t != (Type*) 1)
{
FilePuts (f, " = ");
if (!Print (f, BoxValue (u->value, 0), format, base, width, prec, fill))
return False;
}
}
else
FilePuts (f, "<unset>");
if (format == 'v')
FileOutput (f, '}');
return True;
}
static void
UnionMark (void *object)
{
Union *u = object;
MemReference (u->type);
MemReference (u->value);
}
static Value
UnionEqual (Value av, Value bv, int expandOk)
{
Union *a = &av->unions, *b = &bv->unions;
if (!ValueIsUnion(av))
return Equal (av, BoxValue (b->value, 0));
if (!ValueIsUnion(bv))
return Equal (BoxValue (a->value, 0), bv);
if (a->tag != b->tag)
return FalseVal;
return Equal (BoxValue (a->value, 0), BoxValue (b->value, 0));
}
ValueRep UnionRep = {
{ UnionMark, 0, "UnionRep" }, /* base */
rep_union, /* tag */
{ /* binary */
0,
0,
0,
0,
0,
0,
0,
UnionEqual,
0,
0,
},
{ /* unary */
0,
0,
0,
},
0,
0,
UnionPrint,
0,
};
Value
NewUnion (StructType *type, Bool constant)
{
ENTER ();
Value ret;
ret = ALLOCATE (&UnionRep.data, sizeof (Union));
ret->unions.type = type;
ret->unions.tag = 0;
ret->unions.value = 0;
ret->unions.value = NewBox (constant, False, 1, 0);
RETURN (ret);
}
Type *
BuildUnionType (int nelements, ...)
{
ENTER ();
StructType *st;
int i;
char *name;
Type *type;
va_list ap;
st = NewStructType (nelements);
va_start (ap, nelements);
for (i = 0; i < nelements; i++)
{
type = va_arg (ap, Type *);
name = va_arg (ap, char *);
AddBoxType (&st->types, type);
StructTypeAtoms (st)[i] = AtomId (name);
}
va_end (ap);
RETURN (NewTypeUnion (st, False));
}
Type *
BuildEnumType (int nelements, ...)
{
ENTER ();
StructType *st;
int i;
char *name;
va_list ap;
st = NewStructType (nelements);
va_start (ap, nelements);
for (i = 0; i < nelements; i++)
{
name = va_arg (ap, char *);
AddBoxType (&st->types, typePrim[rep_void]);
StructTypeAtoms (st)[i] = AtomId (name);
}
va_end (ap);
RETURN (NewTypeUnion (st, True));
}
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