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#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "lexer.h"
#include "lexerunix.h"
#include "parse.h"
#include "obj.h"
#include "compile.h"
#include "runtime0.h"
#include "runtime.h"
#include "map.h"
#include "builtin.h"
#define PATH_SEP_CHAR '/'
mp_obj_t sys_path;
mp_import_stat_t stat_dir_or_file(vstr_t *path) {
//printf("stat %s\n", vstr_str(path));
mp_import_stat_t stat = mp_import_stat(vstr_str(path));
if (stat == MP_IMPORT_STAT_DIR) {
return stat;
}
vstr_add_str(path, ".py");
stat = mp_import_stat(vstr_str(path));
if (stat == MP_IMPORT_STAT_FILE) {
return stat;
}
return MP_IMPORT_STAT_NO_EXIST;
}
mp_import_stat_t find_file(const char *file_str, uint file_len, vstr_t *dest) {
// extract the list of paths
uint path_num = 0;
mp_obj_t *path_items;
if (sys_path != MP_OBJ_NULL) {
mp_obj_list_get(sys_path, &path_num, &path_items);
}
if (path_num == 0) {
// sys_path is empty, so just use the given file name
vstr_add_strn(dest, file_str, file_len);
return stat_dir_or_file(dest);
} else {
// go through each path looking for a directory or file
for (int i = 0; i < path_num; i++) {
vstr_reset(dest);
uint p_len;
const char *p = mp_obj_str_get_data(path_items[i], &p_len);
if (p_len > 0) {
vstr_add_strn(dest, p, p_len);
vstr_add_char(dest, PATH_SEP_CHAR);
}
vstr_add_strn(dest, file_str, file_len);
mp_import_stat_t stat = stat_dir_or_file(dest);
if (stat != MP_IMPORT_STAT_NO_EXIST) {
return stat;
}
}
// could not find a directory or file
return MP_IMPORT_STAT_NO_EXIST;
}
}
void do_load(mp_obj_t module_obj, vstr_t *file) {
// create the lexer
mp_lexer_t *lex = mp_lexer_new_from_file(vstr_str(file));
if (lex == NULL) {
// we verified the file exists using stat, but lexer could still fail
nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_ImportError, "ImportError: No module named '%s'", vstr_str(file)));
}
qstr source_name = mp_lexer_source_name(lex);
// save the old context
mp_map_t *old_locals = rt_locals_get();
mp_map_t *old_globals = rt_globals_get();
// set the new context
rt_locals_set(mp_obj_module_get_globals(module_obj));
rt_globals_set(mp_obj_module_get_globals(module_obj));
// parse the imported script
qstr parse_exc_id;
const char *parse_exc_msg;
mp_parse_node_t pn = mp_parse(lex, MP_PARSE_FILE_INPUT, &parse_exc_id, &parse_exc_msg);
mp_lexer_free(lex);
if (pn == MP_PARSE_NODE_NULL) {
// parse error; clean up and raise exception
rt_locals_set(old_locals);
rt_globals_set(old_globals);
nlr_jump(mp_obj_new_exception_msg(parse_exc_id, parse_exc_msg));
}
// compile the imported script
mp_obj_t module_fun = mp_compile(pn, source_name, false);
mp_parse_node_free(pn);
if (module_fun == mp_const_none) {
// TODO handle compile error correctly
rt_locals_set(old_locals);
rt_globals_set(old_globals);
return;
}
// complied successfully, execute it
nlr_buf_t nlr;
if (nlr_push(&nlr) == 0) {
rt_call_function_0(module_fun);
nlr_pop();
} else {
// exception; restore context and re-raise same exception
rt_locals_set(old_locals);
rt_globals_set(old_globals);
nlr_jump(nlr.ret_val);
}
rt_locals_set(old_locals);
rt_globals_set(old_globals);
}
mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
/*
printf("import:\n");
for (int i = 0; i < n; i++) {
printf(" ");
mp_obj_print(args[i]);
printf("\n");
}
*/
// check if module already exists
mp_obj_t module_obj = mp_obj_module_get(mp_obj_str_get_qstr(args[0]));
if (module_obj != MP_OBJ_NULL) {
return module_obj;
}
uint mod_len;
const char *mod_str = (const char*)mp_obj_str_get_data(args[0], &mod_len);
uint last = 0;
VSTR_FIXED(path, MICROPY_PATH_MAX)
module_obj = MP_OBJ_NULL;
uint i;
for (i = 1; i <= mod_len; i++) {
if (i == mod_len || mod_str[i] == '.') {
// create a qstr for the module name up to this depth
qstr mod_name = qstr_from_strn(mod_str, i);
// find the file corresponding to the module name
mp_import_stat_t stat;
if (vstr_len(&path) == 0) {
// first module in the dotted-name; search for a directory or file
stat = find_file(mod_str, i, &path);
} else {
// latter module in the dotted-name; append to path
vstr_add_char(&path, PATH_SEP_CHAR);
vstr_add_strn(&path, mod_str + last, i - last);
stat = stat_dir_or_file(&path);
}
last = i + 1;
// fail if we couldn't find the file
if (stat == MP_IMPORT_STAT_NO_EXIST) {
nlr_jump(mp_obj_new_exception_msg_varg(MP_QSTR_ImportError, "ImportError: No module named '%s'", qstr_str(mod_name)));
}
module_obj = mp_obj_module_get(mod_name);
if (module_obj == MP_OBJ_NULL) {
// module not already loaded, so load it!
module_obj = mp_obj_new_module(mod_name);
if (stat == MP_IMPORT_STAT_DIR) {
vstr_add_char(&path, PATH_SEP_CHAR);
vstr_add_str(&path, "__init__.py");
if (mp_import_stat(vstr_str(&path)) == MP_IMPORT_STAT_FILE) {
do_load(module_obj, &path);
}
vstr_cut_tail(&path, 12); // cut off /__init__.py
} else { // MP_IMPORT_STAT_FILE
do_load(module_obj, &path);
break;
}
}
}
}
if (i < mod_len) {
// we loaded a package, now need to load objects from within that package
// TODO
assert(0);
}
return module_obj;
}
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin___import___obj, 1, 5, mp_builtin___import__);
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