qse/ase/lsp/env.c

84 lines
1.6 KiB
C

/*
* $Id: env.c,v 1.4 2005-02-05 05:43:55 bacon Exp $
*/
#include <xp/lisp/env.h>
#include <xp/c/memory.h>
#include <xp/c/assert.h>
xp_lisp_assoc_t* xp_lisp_assoc_new (xp_lisp_obj_t* name, xp_lisp_obj_t* value)
{
xp_lisp_assoc_t* assoc;
assoc = (xp_lisp_assoc_t*) xp_malloc (sizeof(xp_lisp_assoc_t));
if (assoc == XP_NULL) return XP_NULL;
assoc->name = name;
assoc->value = value;
assoc->link = XP_NULL;
return assoc;
}
void xp_lisp_assoc_free (xp_lisp_assoc_t* assoc)
{
xp_free (assoc);
}
xp_lisp_frame_t* xp_lisp_frame_new (void)
{
xp_lisp_frame_t* frame;
frame = (xp_lisp_frame_t*) xp_malloc (sizeof(xp_lisp_frame_t));
if (frame == XP_NULL) return XP_NULL;
frame->assoc = XP_NULL;
frame->link = XP_NULL;
return frame;
}
void xp_lisp_frame_free (xp_lisp_frame_t* frame)
{
xp_lisp_assoc_t* assoc, * link;
// destroy the associations
assoc = frame->assoc;
while (assoc != XP_NULL) {
link = assoc->link;
xp_lisp_assoc_free (assoc);
assoc = link;
}
xp_free (frame);
}
xp_lisp_assoc_t* xp_lisp_frame_lookup (xp_lisp_frame_t* frame, xp_lisp_obj_t* name)
{
xp_lisp_assoc_t* assoc;
xp_assert (XP_LISP_TYPE(name) == XP_LISP_OBJ_SYMBOL);
assoc = frame->assoc;
while (assoc != XP_NULL) {
if (name == assoc->name) return assoc;
assoc = assoc->link;
}
return XP_NULL;
}
xp_lisp_assoc_t* xp_lisp_frame_insert (
xp_lisp_frame_t* frame, xp_lisp_obj_t* name, xp_lisp_obj_t* value)
{
xp_lisp_assoc_t* assoc;
xp_assert (XP_LISP_TYPE(name) == XP_LISP_OBJ_SYMBOL);
assoc = xp_lisp_assoc_new (name, value);
if (assoc == XP_NULL) return XP_NULL;
assoc->link = frame->assoc;
frame->assoc = assoc;
return assoc;
}