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