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/* Module definition and import implementation */
#include "allobjects.h"
#include "node.h"
#include "token.h"
#include "graminit.h"
#include "import.h"
#include "errcode.h"
#include "sysmodule.h"
#include "pythonrun.h"
/* Define pathname separator used in file names */
#ifdef THINK_C
#define SEP ':'
#endif
#ifndef SEP
#define SEP '/'
#endif
static object *modules;
/* Initialization */
void
initimport()
{
if ((modules = newdictobject()) == NULL)
fatal("no mem for dictionary of modules");
}
object *
get_modules()
{
return modules;
}
object *
add_module(name)
char *name;
{
object *m;
if ((m = dictlookup(modules, name)) != NULL && is_moduleobject(m))
return m;
m = newmoduleobject(name);
if (m == NULL)
return NULL;
if (dictinsert(modules, name, m) != 0) {
DECREF(m);
return NULL;
}
DECREF(m); /* Yes, it still exists, in modules! */
return m;
}
static FILE *
open_module(name, suffix, namebuf)
char *name;
char *suffix;
char *namebuf; /* XXX No buffer overflow checks! */
{
object *path;
FILE *fp;
path = sysget("path");
if (path == NULL || !is_listobject(path)) {
strcpy(namebuf, name);
strcat(namebuf, suffix);
fp = fopen(namebuf, "r");
}
else {
int npath = getlistsize(path);
int i;
fp = NULL;
for (i = 0; i < npath; i++) {
object *v = getlistitem(path, i);
int len;
if (!is_stringobject(v))
continue;
strcpy(namebuf, getstringvalue(v));
len = getstringsize(v);
if (len > 0 && namebuf[len-1] != SEP)
namebuf[len++] = SEP;
strcpy(namebuf+len, name);
strcat(namebuf, suffix);
fp = fopen(namebuf, "r");
if (fp != NULL)
break;
}
}
return fp;
}
static object *
get_module(m, name, m_ret)
/*module*/object *m;
char *name;
object **m_ret;
{
object *d;
FILE *fp;
node *n;
int err;
char namebuf[256];
fp = open_module(name, ".py", namebuf);
if (fp == NULL) {
if (m == NULL)
err_setstr(NameError, name);
else
err_setstr(RuntimeError, "no module source file");
return NULL;
}
err = parse_file(fp, namebuf, file_input, &n);
fclose(fp);
if (err != E_DONE) {
err_input(err);
return NULL;
}
if (m == NULL) {
m = add_module(name);
if (m == NULL) {
freetree(n);
return NULL;
}
*m_ret = m;
}
d = getmoduledict(m);
return run_node(n, namebuf, d, d);
}
static object *
load_module(name)
char *name;
{
object *m, *v;
v = get_module((object *)NULL, name, &m);
if (v == NULL)
return NULL;
DECREF(v);
return m;
}
object *
import_module(name)
char *name;
{
object *m;
if ((m = dictlookup(modules, name)) == NULL) {
if (init_builtin(name)) {
if ((m = dictlookup(modules, name)) == NULL)
err_setstr(SystemError, "builtin module missing");
}
else {
m = load_module(name);
}
}
return m;
}
object *
reload_module(m)
object *m;
{
if (m == NULL || !is_moduleobject(m)) {
err_setstr(TypeError, "reload() argument must be module");
return NULL;
}
/* XXX Ought to check for builtin modules -- can't reload these... */
return get_module(m, getmodulename(m), (object **)NULL);
}
static void
cleardict(d)
object *d;
{
int i;
for (i = getdictsize(d); --i >= 0; ) {
char *k;
k = getdictkey(d, i);
if (k != NULL)
(void) dictremove(d, k);
}
}
void
doneimport()
{
if (modules != NULL) {
int i;
/* Explicitly erase all modules; this is the safest way
to get rid of at least *some* circular dependencies */
for (i = getdictsize(modules); --i >= 0; ) {
char *k;
k = getdictkey(modules, i);
if (k != NULL) {
object *m;
m = dictlookup(modules, k);
if (m != NULL && is_moduleobject(m)) {
object *d;
d = getmoduledict(m);
if (d != NULL && is_dictobject(d)) {
cleardict(d);
}
}
}
}
cleardict(modules);
}
DECREF(modules);
}
/* Initialize built-in modules when first imported */
extern struct {
char *name;
void (*initfunc)();
} inittab[];
static int
init_builtin(name)
char *name;
{
int i;
for (i = 0; inittab[i].name != NULL; i++) {
if (strcmp(name, inittab[i].name) == 0) {
(*inittab[i].initfunc)();
return 1;
}
}
return 0;
}
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