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[workaround] write function now stops in a certain recursion depth

This commit is contained in:
Yuichi Nishiwaki 2014-02-17 23:08:17 +09:00
parent ceef33af8a
commit ad3aca95a3
1 changed files with 36 additions and 10 deletions
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46
src/write.c
View File

@ -8,7 +8,7 @@
#include "picrin/blob.h"
#include "picrin/macro.h"
static void write(pic_state *, pic_value, XFILE *file);
static void write_node(pic_state *, pic_value, XFILE *file);
static bool
is_quote(pic_state *pic, pic_value pair)
@ -38,21 +38,31 @@ is_quasiquote(pic_state *pic, pic_value pair)
&& pic_eq_p(pic_car(pic, pair), pic_symbol_value(pic->sQUASIQUOTE));
}
static int write_depth;
static const int write_max_depth = 50;
static void
write_pair(pic_state *pic, struct pic_pair *pair, XFILE *file)
{
write(pic, pair->car, file);
if (write_depth >= write_max_depth) {
xfprintf(file, "...");
return;
}
write_node(pic, pair->car, file);
if (pic_nil_p(pair->cdr)) {
return;
}
if (pic_pair_p(pair->cdr)) {
xfprintf(file, " ");
write_depth++;
write_pair(pic, pic_pair_ptr(pair->cdr), file);
write_depth--;
return;
}
xfprintf(file, " . ");
write(pic, pair->cdr, file);
write_node(pic, pair->cdr, file);
}
static void
@ -72,10 +82,17 @@ write_str(pic_state *pic, struct pic_string *str, XFILE *file)
}
static void
write(pic_state *pic, pic_value obj, XFILE *file)
write_node(pic_state *pic, pic_value obj, XFILE *file)
{
size_t i;
if (write_depth >= write_max_depth) {
xfprintf(file, "...");
return;
}
write_depth++;
switch (pic_type(obj)) {
case PIC_TT_NIL:
xfprintf(file, "()");
@ -89,22 +106,22 @@ write(pic_state *pic, pic_value obj, XFILE *file)
case PIC_TT_PAIR:
if (is_quote(pic, obj)) {
xfprintf(file, "'");
write(pic, pic_list_ref(pic, obj, 1), file);
write_node(pic, pic_list_ref(pic, obj, 1), file);
break;
}
else if (is_unquote(pic, obj)) {
xfprintf(file, ",");
write(pic, pic_list_ref(pic, obj, 1), file);
write_node(pic, pic_list_ref(pic, obj, 1), file);
break;
}
else if (is_unquote_splicing(pic, obj)) {
xfprintf(file, ",@");
write(pic, pic_list_ref(pic, obj, 1), file);
write_node(pic, pic_list_ref(pic, obj, 1), file);
break;
}
else if (is_quasiquote(pic, obj)) {
xfprintf(file, "`");
write(pic, pic_list_ref(pic, obj, 1), file);
write_node(pic, pic_list_ref(pic, obj, 1), file);
break;
}
xfprintf(file, "(");
@ -153,7 +170,7 @@ write(pic_state *pic, pic_value obj, XFILE *file)
case PIC_TT_VECTOR:
xfprintf(file, "#(");
for (i = 0; i < pic_vec_ptr(obj)->len; ++i) {
write(pic, pic_vec_ptr(obj)->data[i], file);
write_node(pic, pic_vec_ptr(obj)->data[i], file);
if (i + 1 < pic_vec_ptr(obj)->len) {
xfprintf(file, " ");
}
@ -187,7 +204,7 @@ write(pic_state *pic, pic_value obj, XFILE *file)
break;
case PIC_TT_SC:
xfprintf(file, "#<sc %p: ", pic_ptr(obj));
write(pic, pic_sc(obj)->expr, file);
write_node(pic, pic_sc(obj)->expr, file);
xfprintf(file, ">");
break;
case PIC_TT_LIB:
@ -200,6 +217,15 @@ write(pic_state *pic, pic_value obj, XFILE *file)
xfprintf(file, "#<irep %p>", pic_ptr(obj));
break;
}
write_depth--;
}
static void
write(pic_state *pic, pic_value obj, XFILE *file)
{
write_depth = 0;
write_node(pic, obj, file);
}
pic_value