kopia lustrzana https://github.com/micropython/micropython
515 wiersze
19 KiB
C
515 wiersze
19 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2014 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include "py/compile.h"
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#include "py/objmodule.h"
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#include "py/persistentcode.h"
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#include "py/runtime.h"
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#include "py/builtin.h"
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#include "py/frozenmod.h"
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#if MICROPY_DEBUG_VERBOSE // print debugging info
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#define DEBUG_PRINT (1)
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#define DEBUG_printf DEBUG_printf
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#else // don't print debugging info
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#define DEBUG_PRINT (0)
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#define DEBUG_printf(...) (void)0
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#endif
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#if MICROPY_ENABLE_EXTERNAL_IMPORT
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#define PATH_SEP_CHAR '/'
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bool mp_obj_is_package(mp_obj_t module) {
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mp_obj_t dest[2];
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mp_load_method_maybe(module, MP_QSTR___path__, dest);
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return dest[0] != MP_OBJ_NULL;
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}
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// Stat either frozen or normal module by a given path
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// (whatever is available, if at all).
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STATIC mp_import_stat_t mp_import_stat_any(const char *path) {
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#if MICROPY_MODULE_FROZEN
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mp_import_stat_t st = mp_frozen_stat(path);
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if (st != MP_IMPORT_STAT_NO_EXIST) {
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return st;
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}
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#endif
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return mp_import_stat(path);
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}
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STATIC mp_import_stat_t stat_file_py_or_mpy(vstr_t *path) {
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mp_import_stat_t stat = mp_import_stat_any(vstr_null_terminated_str(path));
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if (stat == MP_IMPORT_STAT_FILE) {
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return stat;
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}
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#if MICROPY_PERSISTENT_CODE_LOAD
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vstr_ins_byte(path, path->len - 2, 'm');
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stat = mp_import_stat_any(vstr_null_terminated_str(path));
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if (stat == MP_IMPORT_STAT_FILE) {
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return stat;
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}
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#endif
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return MP_IMPORT_STAT_NO_EXIST;
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}
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STATIC mp_import_stat_t stat_dir_or_file(vstr_t *path) {
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mp_import_stat_t stat = mp_import_stat_any(vstr_null_terminated_str(path));
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DEBUG_printf("stat %s: %d\n", vstr_str(path), stat);
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if (stat == MP_IMPORT_STAT_DIR) {
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return stat;
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}
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// not a directory, add .py and try as a file
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vstr_add_str(path, ".py");
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return stat_file_py_or_mpy(path);
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}
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STATIC mp_import_stat_t find_file(const char *file_str, uint file_len, vstr_t *dest) {
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#if MICROPY_PY_SYS
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// extract the list of paths
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size_t path_num;
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mp_obj_t *path_items;
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mp_obj_list_get(mp_sys_path, &path_num, &path_items);
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if (path_num == 0) {
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#endif
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// mp_sys_path is empty, so just use the given file name
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vstr_add_strn(dest, file_str, file_len);
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return stat_dir_or_file(dest);
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#if MICROPY_PY_SYS
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} else {
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// go through each path looking for a directory or file
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for (size_t i = 0; i < path_num; i++) {
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vstr_reset(dest);
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size_t p_len;
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const char *p = mp_obj_str_get_data(path_items[i], &p_len);
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if (p_len > 0) {
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vstr_add_strn(dest, p, p_len);
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vstr_add_char(dest, PATH_SEP_CHAR);
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}
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vstr_add_strn(dest, file_str, file_len);
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mp_import_stat_t stat = stat_dir_or_file(dest);
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if (stat != MP_IMPORT_STAT_NO_EXIST) {
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return stat;
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}
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}
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// could not find a directory or file
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return MP_IMPORT_STAT_NO_EXIST;
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}
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#endif
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}
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#if MICROPY_MODULE_FROZEN_STR || MICROPY_ENABLE_COMPILER
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STATIC void do_load_from_lexer(mp_obj_t module_obj, mp_lexer_t *lex) {
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#if MICROPY_PY___FILE__
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qstr source_name = lex->source_name;
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mp_store_attr(module_obj, MP_QSTR___file__, MP_OBJ_NEW_QSTR(source_name));
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#endif
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// parse, compile and execute the module in its context
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mp_obj_dict_t *mod_globals = mp_obj_module_get_globals(module_obj);
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mp_parse_compile_execute(lex, MP_PARSE_FILE_INPUT, mod_globals, mod_globals);
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}
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#endif
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#if MICROPY_PERSISTENT_CODE_LOAD || MICROPY_MODULE_FROZEN_MPY
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STATIC void do_execute_raw_code(mp_obj_t module_obj, mp_raw_code_t *raw_code) {
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#if MICROPY_PY___FILE__
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// TODO
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//qstr source_name = lex->source_name;
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//mp_store_attr(module_obj, MP_QSTR___file__, MP_OBJ_NEW_QSTR(source_name));
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#endif
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// execute the module in its context
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mp_obj_dict_t *mod_globals = mp_obj_module_get_globals(module_obj);
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// save context
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mp_obj_dict_t *volatile old_globals = mp_globals_get();
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mp_obj_dict_t *volatile old_locals = mp_locals_get();
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// set new context
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mp_globals_set(mod_globals);
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mp_locals_set(mod_globals);
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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mp_obj_t module_fun = mp_make_function_from_raw_code(raw_code, MP_OBJ_NULL, MP_OBJ_NULL);
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mp_call_function_0(module_fun);
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// finish nlr block, restore context
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nlr_pop();
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mp_globals_set(old_globals);
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mp_locals_set(old_locals);
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} else {
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// exception; restore context and re-raise same exception
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mp_globals_set(old_globals);
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mp_locals_set(old_locals);
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nlr_jump(nlr.ret_val);
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}
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}
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#endif
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STATIC void do_load(mp_obj_t module_obj, vstr_t *file) {
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#if MICROPY_MODULE_FROZEN || MICROPY_ENABLE_COMPILER || (MICROPY_PERSISTENT_CODE_LOAD && MICROPY_HAS_FILE_READER)
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char *file_str = vstr_null_terminated_str(file);
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#endif
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// If we support frozen modules (either as str or mpy) then try to find the
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// requested filename in the list of frozen module filenames.
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#if MICROPY_MODULE_FROZEN
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void *modref;
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int frozen_type = mp_find_frozen_module(file_str, file->len, &modref);
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#endif
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// If we support frozen str modules and the compiler is enabled, and we
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// found the filename in the list of frozen files, then load and execute it.
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#if MICROPY_MODULE_FROZEN_STR
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if (frozen_type == MP_FROZEN_STR) {
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do_load_from_lexer(module_obj, modref);
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return;
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}
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#endif
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// If we support frozen mpy modules and we found a corresponding file (and
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// its data) in the list of frozen files, execute it.
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#if MICROPY_MODULE_FROZEN_MPY
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if (frozen_type == MP_FROZEN_MPY) {
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do_execute_raw_code(module_obj, modref);
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return;
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}
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#endif
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// If we support loading .mpy files then check if the file extension is of
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// the correct format and, if so, load and execute the file.
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#if MICROPY_HAS_FILE_READER && MICROPY_PERSISTENT_CODE_LOAD
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if (file_str[file->len - 3] == 'm') {
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mp_raw_code_t *raw_code = mp_raw_code_load_file(file_str);
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do_execute_raw_code(module_obj, raw_code);
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return;
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}
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#endif
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// If we can compile scripts then load the file and compile and execute it.
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#if MICROPY_ENABLE_COMPILER
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{
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mp_lexer_t *lex = mp_lexer_new_from_file(file_str);
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do_load_from_lexer(module_obj, lex);
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return;
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}
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#else
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// If we get here then the file was not frozen and we can't compile scripts.
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mp_raise_msg(&mp_type_ImportError, "script compilation not supported");
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#endif
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}
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STATIC void chop_component(const char *start, const char **end) {
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const char *p = *end;
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while (p > start) {
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if (*--p == '.') {
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*end = p;
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return;
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}
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}
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*end = p;
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}
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mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
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#if DEBUG_PRINT
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DEBUG_printf("__import__:\n");
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for (size_t i = 0; i < n_args; i++) {
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DEBUG_printf(" ");
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mp_obj_print(args[i], PRINT_REPR);
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DEBUG_printf("\n");
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}
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#endif
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mp_obj_t module_name = args[0];
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mp_obj_t fromtuple = mp_const_none;
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mp_int_t level = 0;
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if (n_args >= 4) {
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fromtuple = args[3];
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if (n_args >= 5) {
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level = MP_OBJ_SMALL_INT_VALUE(args[4]);
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if (level < 0) {
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mp_raise_ValueError(NULL);
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}
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}
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}
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size_t mod_len;
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const char *mod_str = mp_obj_str_get_data(module_name, &mod_len);
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if (level != 0) {
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// What we want to do here is to take name of current module,
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// chop <level> trailing components, and concatenate with passed-in
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// module name, thus resolving relative import name into absolute.
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// This even appears to be correct per
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// http://legacy.python.org/dev/peps/pep-0328/#relative-imports-and-name
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// "Relative imports use a module's __name__ attribute to determine that
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// module's position in the package hierarchy."
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level--;
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mp_obj_t this_name_q = mp_obj_dict_get(MP_OBJ_FROM_PTR(mp_globals_get()), MP_OBJ_NEW_QSTR(MP_QSTR___name__));
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assert(this_name_q != MP_OBJ_NULL);
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#if MICROPY_CPYTHON_COMPAT
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if (MP_OBJ_QSTR_VALUE(this_name_q) == MP_QSTR___main__) {
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// This is a module run by -m command-line switch, get its real name from backup attribute
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this_name_q = mp_obj_dict_get(MP_OBJ_FROM_PTR(mp_globals_get()), MP_OBJ_NEW_QSTR(MP_QSTR___main__));
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}
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#endif
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mp_map_t *globals_map = &mp_globals_get()->map;
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mp_map_elem_t *elem = mp_map_lookup(globals_map, MP_OBJ_NEW_QSTR(MP_QSTR___path__), MP_MAP_LOOKUP);
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bool is_pkg = (elem != NULL);
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#if DEBUG_PRINT
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DEBUG_printf("Current module/package: ");
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mp_obj_print(this_name_q, PRINT_REPR);
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DEBUG_printf(", is_package: %d", is_pkg);
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DEBUG_printf("\n");
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#endif
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size_t this_name_l;
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const char *this_name = mp_obj_str_get_data(this_name_q, &this_name_l);
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const char *p = this_name + this_name_l;
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if (!is_pkg) {
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// We have module, but relative imports are anchored at package, so
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// go there.
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chop_component(this_name, &p);
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}
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while (level--) {
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chop_component(this_name, &p);
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}
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// We must have some component left over to import from
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if (p == this_name) {
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mp_raise_ValueError("cannot perform relative import");
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}
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uint new_mod_l = (mod_len == 0 ? (size_t)(p - this_name) : (size_t)(p - this_name) + 1 + mod_len);
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char *new_mod = mp_local_alloc(new_mod_l);
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memcpy(new_mod, this_name, p - this_name);
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if (mod_len != 0) {
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new_mod[p - this_name] = '.';
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memcpy(new_mod + (p - this_name) + 1, mod_str, mod_len);
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}
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qstr new_mod_q = qstr_from_strn(new_mod, new_mod_l);
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mp_local_free(new_mod);
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DEBUG_printf("Resolved base name for relative import: '%s'\n", qstr_str(new_mod_q));
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module_name = MP_OBJ_NEW_QSTR(new_mod_q);
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mod_str = qstr_str(new_mod_q);
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mod_len = new_mod_l;
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}
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// check if module already exists
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qstr module_name_qstr = mp_obj_str_get_qstr(module_name);
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mp_obj_t module_obj = mp_module_get(module_name_qstr);
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if (module_obj != MP_OBJ_NULL) {
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DEBUG_printf("Module already loaded\n");
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// If it's not a package, return module right away
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char *p = strchr(mod_str, '.');
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if (p == NULL) {
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return module_obj;
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}
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// If fromlist is not empty, return leaf module
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if (fromtuple != mp_const_none) {
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return module_obj;
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}
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// Otherwise, we need to return top-level package
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qstr pkg_name = qstr_from_strn(mod_str, p - mod_str);
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return mp_module_get(pkg_name);
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}
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DEBUG_printf("Module not yet loaded\n");
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uint last = 0;
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VSTR_FIXED(path, MICROPY_ALLOC_PATH_MAX)
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module_obj = MP_OBJ_NULL;
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mp_obj_t top_module_obj = MP_OBJ_NULL;
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mp_obj_t outer_module_obj = MP_OBJ_NULL;
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uint i;
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for (i = 1; i <= mod_len; i++) {
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if (i == mod_len || mod_str[i] == '.') {
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// create a qstr for the module name up to this depth
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qstr mod_name = qstr_from_strn(mod_str, i);
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DEBUG_printf("Processing module: %s\n", qstr_str(mod_name));
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DEBUG_printf("Previous path: =%.*s=\n", vstr_len(&path), vstr_str(&path));
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// find the file corresponding to the module name
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mp_import_stat_t stat;
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if (vstr_len(&path) == 0) {
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// first module in the dotted-name; search for a directory or file
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stat = find_file(mod_str, i, &path);
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} else {
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// latter module in the dotted-name; append to path
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vstr_add_char(&path, PATH_SEP_CHAR);
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vstr_add_strn(&path, mod_str + last, i - last);
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stat = stat_dir_or_file(&path);
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}
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DEBUG_printf("Current path: %.*s\n", vstr_len(&path), vstr_str(&path));
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|
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if (stat == MP_IMPORT_STAT_NO_EXIST) {
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#if MICROPY_MODULE_WEAK_LINKS
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// check if there is a weak link to this module
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if (i == mod_len) {
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mp_map_elem_t *el = mp_map_lookup((mp_map_t*)&mp_builtin_module_weak_links_map, MP_OBJ_NEW_QSTR(mod_name), MP_MAP_LOOKUP);
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if (el == NULL) {
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goto no_exist;
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}
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// found weak linked module
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module_obj = el->value;
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mp_module_call_init(mod_name, module_obj);
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} else {
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no_exist:
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#else
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{
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#endif
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// couldn't find the file, so fail
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if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
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mp_raise_msg(&mp_type_ImportError, "module not found");
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} else {
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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ImportError,
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"no module named '%q'", mod_name));
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}
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}
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} else {
|
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// found the file, so get the module
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module_obj = mp_module_get(mod_name);
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}
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|
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if (module_obj == MP_OBJ_NULL) {
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// module not already loaded, so load it!
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|
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module_obj = mp_obj_new_module(mod_name);
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|
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// if args[3] (fromtuple) has magic value False, set up
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|
// this module for command-line "-m" option (set module's
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|
// name to __main__ instead of real name). Do this only
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|
// for *modules* however - packages never have their names
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|
// replaced, instead they're -m'ed using a special __main__
|
|
// submodule in them. (This all apparently is done to not
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|
// touch package name itself, which is important for future
|
|
// imports).
|
|
if (i == mod_len && fromtuple == mp_const_false && stat != MP_IMPORT_STAT_DIR) {
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mp_obj_module_t *o = MP_OBJ_TO_PTR(module_obj);
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mp_obj_dict_store(MP_OBJ_FROM_PTR(o->globals), MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR___main__));
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#if MICROPY_CPYTHON_COMPAT
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// Store module as "__main__" in the dictionary of loaded modules (returned by sys.modules).
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mp_obj_dict_store(MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_loaded_modules_dict)), MP_OBJ_NEW_QSTR(MP_QSTR___main__), module_obj);
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// Store real name in "__main__" attribute. Chosen semi-randonly, to reuse existing qstr's.
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mp_obj_dict_store(MP_OBJ_FROM_PTR(o->globals), MP_OBJ_NEW_QSTR(MP_QSTR___main__), MP_OBJ_NEW_QSTR(mod_name));
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|
#endif
|
|
}
|
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|
|
if (stat == MP_IMPORT_STAT_DIR) {
|
|
DEBUG_printf("%.*s is dir\n", vstr_len(&path), vstr_str(&path));
|
|
// https://docs.python.org/3/reference/import.html
|
|
// "Specifically, any module that contains a __path__ attribute is considered a package."
|
|
mp_store_attr(module_obj, MP_QSTR___path__, mp_obj_new_str(vstr_str(&path), vstr_len(&path)));
|
|
size_t orig_path_len = path.len;
|
|
vstr_add_char(&path, PATH_SEP_CHAR);
|
|
vstr_add_str(&path, "__init__.py");
|
|
if (stat_file_py_or_mpy(&path) != MP_IMPORT_STAT_FILE) {
|
|
//mp_warning("%s is imported as namespace package", vstr_str(&path));
|
|
} else {
|
|
do_load(module_obj, &path);
|
|
}
|
|
path.len = orig_path_len;
|
|
} else { // MP_IMPORT_STAT_FILE
|
|
do_load(module_obj, &path);
|
|
// This should be the last component in the import path. If there are
|
|
// remaining components then it's an ImportError because the current path
|
|
// (the module that was just loaded) is not a package. This will be caught
|
|
// on the next iteration because the file will not exist.
|
|
}
|
|
}
|
|
if (outer_module_obj != MP_OBJ_NULL) {
|
|
qstr s = qstr_from_strn(mod_str + last, i - last);
|
|
mp_store_attr(outer_module_obj, s, module_obj);
|
|
}
|
|
outer_module_obj = module_obj;
|
|
if (top_module_obj == MP_OBJ_NULL) {
|
|
top_module_obj = module_obj;
|
|
}
|
|
last = i + 1;
|
|
}
|
|
}
|
|
|
|
// If fromlist is not empty, return leaf module
|
|
if (fromtuple != mp_const_none) {
|
|
return module_obj;
|
|
}
|
|
// Otherwise, we need to return top-level package
|
|
return top_module_obj;
|
|
}
|
|
|
|
#else // MICROPY_ENABLE_EXTERNAL_IMPORT
|
|
|
|
mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
|
|
// Check that it's not a relative import
|
|
if (n_args >= 5 && MP_OBJ_SMALL_INT_VALUE(args[4]) != 0) {
|
|
mp_raise_NotImplementedError("relative import");
|
|
}
|
|
|
|
// Check if module already exists, and return it if it does
|
|
qstr module_name_qstr = mp_obj_str_get_qstr(args[0]);
|
|
mp_obj_t module_obj = mp_module_get(module_name_qstr);
|
|
if (module_obj != MP_OBJ_NULL) {
|
|
return module_obj;
|
|
}
|
|
|
|
#if MICROPY_MODULE_WEAK_LINKS
|
|
// Check if there is a weak link to this module
|
|
mp_map_elem_t *el = mp_map_lookup((mp_map_t*)&mp_builtin_module_weak_links_map, MP_OBJ_NEW_QSTR(module_name_qstr), MP_MAP_LOOKUP);
|
|
if (el != NULL) {
|
|
// Found weak-linked module
|
|
mp_module_call_init(module_name_qstr, el->value);
|
|
return el->value;
|
|
}
|
|
#endif
|
|
|
|
// Couldn't find the module, so fail
|
|
if (MICROPY_ERROR_REPORTING == MICROPY_ERROR_REPORTING_TERSE) {
|
|
mp_raise_msg(&mp_type_ImportError, "module not found");
|
|
} else {
|
|
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ImportError,
|
|
"no module named '%q'", module_name_qstr));
|
|
}
|
|
}
|
|
|
|
#endif // MICROPY_ENABLE_EXTERNAL_IMPORT
|
|
|
|
MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin___import___obj, 1, 5, mp_builtin___import__);
|