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hyung-hwan
2005-09-19 12:04:00 +00:00
parent 6e6d3f0fa9
commit 324676bbe1
9 changed files with 300 additions and 219 deletions
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160
ase/lsp/prim_let.c Normal file
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/*
* $Id: prim_let.c,v 1.1 2005-09-19 12:04:00 bacon Exp $
*/
#include <xp/lsp/prim.h>
static xp_lsp_obj_t* __prim_let (
xp_lsp_t* lsp, xp_lsp_obj_t* args, int sequential)
{
xp_lsp_frame_t* frame;
xp_lsp_obj_t* assoc;
xp_lsp_obj_t* body;
xp_lsp_obj_t* value;
XP_LSP_PRIM_CHECK_ARG_COUNT (lsp, args, 1, XP_LSP_PRIM_MAX_ARG_COUNT);
// create a new frame
frame = xp_lsp_frame_new ();
if (frame == XP_NULL) {
lsp->errnum = XP_LSP_ERR_MEM;
return XP_NULL;
}
//frame->link = lsp->mem->frame;
if (sequential) {
frame->link = lsp->mem->frame;
lsp->mem->frame = frame;
}
else {
frame->link = lsp->mem->brooding_frame;
lsp->mem->brooding_frame = frame;
}
assoc = XP_LSP_CAR(args);
//while (assoc != lsp->mem->nil) {
while (XP_LSP_TYPE(assoc) == XP_LSP_OBJ_CONS) {
xp_lsp_obj_t* ass = XP_LSP_CAR(assoc);
if (XP_LSP_TYPE(ass) == XP_LSP_OBJ_CONS) {
xp_lsp_obj_t* n = XP_LSP_CAR(ass);
xp_lsp_obj_t* v = XP_LSP_CDR(ass);
if (XP_LSP_TYPE(n) != XP_LSP_OBJ_SYMBOL) {
lsp->errnum = XP_LSP_ERR_BAD_ARG; // must be a symbol
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
if (v != lsp->mem->nil) {
if (XP_LSP_CDR(v) != lsp->mem->nil) {
lsp->errnum = XP_LSP_ERR_TOO_MANY_ARGS; // must be a symbol
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
if ((v = xp_lsp_eval(lsp, XP_LSP_CAR(v))) == XP_NULL) {
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
}
if (xp_lsp_frame_lookup (frame, n) != XP_NULL) {
lsp->errnum = XP_LSP_ERR_DUP_FORMAL;
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
if (xp_lsp_frame_insert (frame, n, v) == XP_NULL) {
lsp->errnum = XP_LSP_ERR_MEM;
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
}
else if (XP_LSP_TYPE(ass) == XP_LSP_OBJ_SYMBOL) {
if (xp_lsp_frame_lookup (frame, ass) != XP_NULL) {
lsp->errnum = XP_LSP_ERR_DUP_FORMAL;
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
if (xp_lsp_frame_insert (frame, ass, lsp->mem->nil) == XP_NULL) {
lsp->errnum = XP_LSP_ERR_MEM;
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
}
else {
lsp->errnum = XP_LSP_ERR_BAD_ARG;
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
assoc = XP_LSP_CDR(assoc);
}
if (assoc != lsp->mem->nil) {
lsp->errnum = XP_LSP_ERR_BAD_ARG;
if (sequential) lsp->mem->frame = frame->link;
else lsp->mem->brooding_frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
// push the frame
if (!sequential) {
lsp->mem->brooding_frame = frame->link;
frame->link = lsp->mem->frame;
lsp->mem->frame = frame;
}
// evaluate forms in the body
value = lsp->mem->nil;
body = XP_LSP_CDR(args);
while (body != lsp->mem->nil) {
value = xp_lsp_eval (lsp, XP_LSP_CAR(body));
if (value == XP_NULL) {
lsp->mem->frame = frame->link;
xp_lsp_frame_free (frame);
return XP_NULL;
}
body = XP_LSP_CDR(body);
}
// pop the frame
lsp->mem->frame = frame->link;
// destroy the frame
xp_lsp_frame_free (frame);
return value;
}
xp_lsp_obj_t* xp_lsp_prim_let (xp_lsp_t* lsp, xp_lsp_obj_t* args)
{
/*
* (defun x (x y)
* (let ((temp1 10) (temp2 20))
* (+ x y temp1 temp2)))
* (x 40 50)
* temp1
*/
return __prim_let (lsp, args, 0);
}
xp_lsp_obj_t* xp_lsp_prim_letx (xp_lsp_t* lsp, xp_lsp_obj_t* args)
{
return __prim_let (lsp, args, 1);
}