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/* $Header: /local/src/CVS/nickle/struct.c,v 1.23 2004/02/27 03:50:16 keithp Exp $ */
/*
* 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
StructMemRef (Value sv, Atom name)
{
ENTER ();
Struct *s = &sv->structs;
StructType *st = s->type;
int i;
for (i = 0; i < st->nelements; i++)
if (StructTypeAtoms(st)[i] == name)
RETURN (NewRef (s->values, i));
RETURN (0);
}
Value
StructMemValue (Value sv, Atom name)
{
ENTER ();
Struct *s = &sv->structs;
StructType *st = s->type;
int i;
for (i = 0; i < st->nelements; i++)
if (StructTypeAtoms(st)[i] == name)
RETURN (BoxValue (s->values, i));
RETURN (0);
}
Type *
StructMemType (StructType *st, Atom name)
{
int i;
for (i = 0; i < st->nelements; i++)
if (StructTypeAtoms(st)[i] == name)
return (BoxTypesElements(st->types)[i]);
return (0);
}
static Bool
StructPrint (Value f, Value av, char format, int base, int width, int prec, int fill)
{
Struct *s = &av->structs;
StructType *st = s->type;
int i;
Bool pretty = format == 'v' || format == 'g';
if (pretty)
FileOutput (f, '{');
for (i = 0; i < st->nelements; i++)
{
FilePuts (f, AtomName (StructTypeAtoms(st)[i]));
FilePuts (f, " = ");
if (!Print (f, BoxValueGet (s->values, i), format, base, width, prec, fill))
return False;
if (i < st->nelements - 1)
{
if (pretty)
FileOutput (f, ',');
FileOutput (f, ' ');
}
}
if (pretty)
FileOutput (f, '}');
return True;
}
static void
StructMark (void *object)
{
Struct *s = object;
MemReference (s->type);
MemReference (s->values);
}
static Value
StructEqual (Value a, Value b, int expandOk)
{
int i;
StructType *at = a->structs.type;
if (at->nelements != b->structs.type->nelements)
return FalseVal;
for (i = 0; i < at->nelements; i++)
{
if (False (Equal (BoxValue (a->structs.values, i),
StructMemValue (b, StructTypeAtoms(at)[i]))))
return FalseVal;
}
return TrueVal;
}
static HashValue
StructHash (Value a)
{
Struct *s = &a->structs;
StructType *at = s->type;
HashValue h = 0;
int i;
for (i = 0; i < at->nelements; i++)
h = h ^ ValueInt (ValueHash (BoxValue (a->structs.values, i)));
return h;
}
ValueRep StructRep = {
{ StructMark, 0, "StructRep" }, /* base */
rep_struct, /* tag */
{ /* binary */
0,
0,
0,
0,
0,
0,
0,
StructEqual,
0,
0,
},
{ /* unary */
0,
0,
0,
},
0,
0,
StructPrint,
0,
StructHash,
};
Value
NewStruct (StructType *type, Bool constant)
{
ENTER ();
Value ret;
ret = ALLOCATE (&StructRep.data, sizeof (Struct));
ret->structs.type = type;
ret->structs.values = 0;
ret->structs.values = NewTypedBox (False, type->types);
RETURN (ret);
}
static void
StructTypeMark (void *object)
{
StructType *st = object;
MemReference (st->types);
}
DataType StructTypeType = { StructTypeMark, 0, "StructTypeType" };
StructType *
NewStructType (int nelements)
{
ENTER ();
StructType *st;
int i;
Atom *atoms;
st = ALLOCATE (&StructTypeType, sizeof (StructType) +
nelements * sizeof (Atom));
st->nelements = nelements;
st->types = NewBoxTypes (nelements);
atoms = StructTypeAtoms(st);
for (i = 0; i < nelements; i++)
atoms[i] = 0;
RETURN (st);
}
Value Elementless;
StructType *ElementlessType;
int
StructInit (void)
{
ENTER ();
ElementlessType = NewStructType (0);
MemAddRoot (ElementlessType);
Elementless = NewStruct (ElementlessType, True);
MemAddRoot (Elementless);
EXIT ();
return 1;
}
Type *
BuildStructType (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 (NewTypeStruct (st));
}
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