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/* struct.c: The `structure' extension is obsolete and should not be used
* in applications any longer; it has been replaced by the more powerful
* `record' extension.
*
* $Id$
*
* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
* Copyright 2002, 2003 Sam Hocevar <sam@hocevar.net>, Paris
*
* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
* between TELES and Nixdorf Microprocessor Engineering, Berlin).
*
* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
* owners or individual owners of copyright in this software, grant to any
* person or company a worldwide, royalty free, license to
*
* i) copy this software,
* ii) prepare derivative works based on this software,
* iii) distribute copies of this software or derivative works,
* iv) perform this software, or
* v) display this software,
*
* provided that this notice is not removed and that neither Oliver Laumann
* nor Teles nor Nixdorf are deemed to have made any representations as to
* the suitability of this software for any purpose nor are held responsible
* for any defects of this software.
*
* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
*/
#include "config.h"
#include "scheme.h"
#define STRUCT(x) ((struct S_Struct *)POINTER(x))
struct S_Struct {
Object name;
Object slots;
Object values;
};
int T_Struct;
static Object P_Structurep (Object x) {
return TYPE(x) == T_Struct ? True : False;
}
static Object P_Structure_Name (Object x) {
Check_Type (x, T_Struct);
return STRUCT(x)->name;
}
static Object P_Structure_Slots (Object x) {
Check_Type (x, T_Struct);
return P_Vector_To_List (STRUCT(x)->slots);
}
static Object P_Structure_Values (Object x) {
Check_Type (x, T_Struct);
return P_Vector_To_List (STRUCT(x)->values);
}
static void Check_Structure_Type (Object x, Object t) {
Check_Type (x, T_Struct);
Check_Type (t, T_Symbol);
if (!EQ(STRUCT(x)->name, t))
Primitive_Error ("wrong structure type ~s (expected ~s)",
STRUCT(x)->name, t);
}
static Object P_Structure_Ref (Object x, Object t, Object n) {
Check_Structure_Type (x, t);
return P_Vector_Ref (STRUCT(x)->values, n);
}
static Object P_Structure_Set (Object x, Object t, Object n, Object obj) {
Check_Structure_Type (x, t);
return P_Vector_Set (STRUCT(x)->values, n, obj);
}
static Object P_Make_Structure (Object name, Object slots) {
register int n;
Object s, vec, *vp;
GC_Node3;
Check_Type (name, T_Symbol);
Check_List (slots);
s = Null;
GC_Link3 (s, name, slots);
s = Alloc_Object (sizeof (struct S_Struct), T_Struct, 0);
STRUCT(s)->name = name;
STRUCT(s)->values = STRUCT(s)->slots = Null;
n = Fast_Length (slots);
vec = Make_Vector (n, Null);
STRUCT(s)->values = vec;
vec = Make_Vector (n, Null);
STRUCT(s)->slots = vec;
GC_Unlink;
for (vp = VECTOR(vec)->data; n--; slots = Cdr (slots)) {
Check_Type (Car (slots), T_Symbol);
*vp++ = Car (slots);
}
return s;
}
static int Structure_Eqv (Object a, Object b) {
return EQ(a,b);
}
static int Structure_Equal (Object a, Object b) {
return EQ(STRUCT(a)->name,STRUCT(b)->name) &&
Equal (STRUCT(a)->slots, STRUCT(b)->slots) &&
Equal (STRUCT(a)->values, STRUCT(b)->values);
}
static int Structure_Print (Object x, Object port,
int raw, int depth, int length) {
struct S_String *s = STRING(SYMBOL(STRUCT(x)->name)->name);
Printf (port, "#[%.*s-structure %lu]", s->size, s->data, POINTER(x));
return 0;
}
static int Structure_Visit (register Object *sp, register int (*f)()) {
(*f)(&STRUCT(*sp)->name);
(*f)(&STRUCT(*sp)->slots);
(*f)(&STRUCT(*sp)->values);
return 0;
}
void elk_init_lib_struct () {
T_Struct = Define_Type (0, "structure", NOFUNC, sizeof (struct S_Struct),
Structure_Eqv, Structure_Equal, Structure_Print, Structure_Visit);
Define_Primitive (P_Structurep, "structure?", 1, 1, EVAL);
Define_Primitive (P_Structure_Name, "structure-name", 1, 1, EVAL);
Define_Primitive (P_Structure_Slots, "structure-slots", 1, 1, EVAL);
Define_Primitive (P_Structure_Values, "structure-values", 1, 1, EVAL);
Define_Primitive (P_Structure_Ref, "structure-ref", 3, 3, EVAL);
Define_Primitive (P_Structure_Set, "structure-set!", 4, 4, EVAL);
Define_Primitive (P_Make_Structure, "make-structure", 2, 2, EVAL);
P_Provide (Intern ("struct.la"));
}
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