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/* Module definition and import implementation */
#include <stdio.h>
#include "string.h"
#include "PROTO.h"
#include "object.h"
#include "stringobject.h"
#include "listobject.h"
#include "dictobject.h"
#include "moduleobject.h"
#include "node.h"
#include "context.h"
#include "token.h"
#include "graminit.h"
#include "run.h"
#include "support.h"
#include "import.h"
#include "errcode.h"
#include "sysmodule.h"
/* Define pathname separator and delimiter in $PYTHONPATH */
#ifdef THINK_C
#define SEP ':'
#define DELIM ' '
#endif
#ifndef SEP
#define SEP '/'
#endif
#ifndef DELIM
#define DELIM ':'
#endif
void
initimport()
{
object *v;
if ((v = newdictobject()) == NULL)
fatal("no mem for module table");
if (sysset("modules", v) != 0)
fatal("can't assign sys.modules");
}
object *
new_module(name)
char *name;
{
object *m;
object *mtab;
mtab = sysget("modules");
if (mtab == NULL || !is_dictobject(mtab)) {
errno = EBADF;
return NULL;
}
m = newmoduleobject(name);
if (m == NULL)
return NULL;
if (dictinsert(mtab, name, m) != 0) {
DECREF(m);
return NULL;
}
return m;
}
void
define_module(ctx, name)
context *ctx;
char *name;
{
object *m, *d;
m = new_module(name);
if (m == NULL) {
puterrno(ctx);
return;
}
d = getmoduledict(m);
INCREF(d);
DECREF(ctx->ctx_locals);
ctx->ctx_locals = d;
INCREF(d);
DECREF(ctx->ctx_globals);
ctx->ctx_globals = d;
DECREF(m);
}
object *
parsepath(path, delim)
char *path;
int delim;
{
int i, n;
char *p;
object *v, *w;
n = 1;
p = path;
while ((p = strchr(p, delim)) != NULL) {
n++;
p++;
}
v = newlistobject(n);
if (v == NULL)
return NULL;
for (i = 0; ; i++) {
p = strchr(path, delim);
if (p == NULL)
p = strchr(path, '\0'); /* End of string */
w = newsizedstringobject(path, (int) (p - path));
if (w == NULL) {
DECREF(v);
return NULL;
}
setlistitem(v, i, w);
if (*p == '\0')
break;
path = p+1;
}
return v;
}
void
setpythonpath(path)
char *path;
{
object *v;
if ((v = parsepath(path, DELIM)) != NULL) {
if (sysset("path", v) != 0)
fatal("can't assign sys.path");
DECREF(v);
}
}
static FILE *
open_module(name, suffix)
char *name;
char *suffix;
{
object *path;
char namebuf[256];
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); /* XXX check for overflow */
strcat(namebuf, suffix); /* XXX ditto */
fp = fopen(namebuf, "r");
if (fp != NULL)
break;
}
}
return fp;
}
static object *
load_module(ctx, name)
context *ctx;
char *name;
{
object *m;
char **p;
FILE *fp;
node *n, *mh;
int err;
object *mtab;
object *save_locals, *save_globals;
mtab = sysget("modules");
if (mtab == NULL || !is_dictobject(mtab)) {
errno = EBADF;
return NULL;
}
fp = open_module(name, ".py");
if (fp == NULL) {
/* XXX Compatibility hack */
fprintf(stderr,
"Can't find '%s.py' in sys.path, trying '%s'\n",
name, name);
fp = open_module(name, "");
}
if (fp == NULL) {
name_error(ctx, name);
return NULL;
}
#ifdef DEBUG
fprintf(stderr, "Reading module %s from file '%s'\n", name, namebuf);
#endif
err = parseinput(fp, file_input, &n);
fclose(fp);
if (err != E_DONE) {
input_error(ctx, err);
return NULL;
}
save_locals = ctx->ctx_locals;
INCREF(save_locals);
save_globals = ctx->ctx_globals;
INCREF(save_globals);
define_module(ctx, name);
exec_node(ctx, n);
DECREF(ctx->ctx_locals);
ctx->ctx_locals = save_locals;
DECREF(ctx->ctx_globals);
ctx->ctx_globals = save_globals;
/* XXX need to free the tree n here; except referenced defs */
if (ctx->ctx_exception) {
dictremove(mtab, name); /* Undefine the module */
return NULL;
}
m = dictlookup(mtab, name);
if (m == NULL) {
error(ctx, "module not defined after loading");
return NULL;
}
return m;
}
object *
import_module(ctx, name)
context *ctx;
char *name;
{
object *m;
object *mtab;
mtab = sysget("modules");
if (mtab == NULL || !is_dictobject(mtab)) {
error(ctx, "bad sys.modules");
return NULL;
}
if ((m = dictlookup(mtab, name)) == NULL) {
m = load_module(ctx, name);
}
return m;
}
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