d720ab5236
In Python, importing module several times returns same underlying module object. This also fixes import statement handling for builtin modules. There're still issues: 1. CPython exposes set of loaded modules as sys.modules, we may want to do that either. 2. Builtin modules are implicitly imported, which is not really correct. We should separate registering a (builtin) module and importing a module. CPython keeps builtin module names in sys.builtin_module_names .
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <assert.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "lexer.h"
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#include "lexerunix.h"
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#include "parse.h"
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#include "obj.h"
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#include "compile.h"
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#include "runtime0.h"
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#include "runtime.h"
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#include "map.h"
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#include "builtin.h"
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mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
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/*
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printf("import:\n");
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for (int i = 0; i < n; i++) {
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printf(" ");
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mp_obj_print(args[i]);
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printf("\n");
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}
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*/
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qstr mod_name = mp_obj_get_qstr(args[0]);
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mp_obj_t loaded = mp_obj_module_get(mod_name);
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if (loaded != MP_OBJ_NULL) {
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return loaded;
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}
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// find the file to import
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mp_lexer_t *lex = mp_import_open_file(mod_name);
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if (lex == NULL) {
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// TODO handle lexer error correctly
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return mp_const_none;
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}
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// create a new module object
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mp_obj_t module_obj = mp_obj_new_module(mp_obj_get_qstr(args[0]));
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// save the old context
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mp_map_t *old_locals = rt_locals_get();
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mp_map_t *old_globals = rt_globals_get();
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// set the new context
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rt_locals_set(mp_obj_module_get_globals(module_obj));
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rt_globals_set(mp_obj_module_get_globals(module_obj));
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// parse the imported script
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qstr parse_exc_id;
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const char *parse_exc_msg;
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mp_parse_node_t pn = mp_parse(lex, MP_PARSE_FILE_INPUT, &parse_exc_id, &parse_exc_msg);
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qstr source_name = mp_lexer_source_name(lex);
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mp_lexer_free(lex);
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if (pn == MP_PARSE_NODE_NULL) {
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// parse error; clean up and raise exception
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rt_locals_set(old_locals);
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rt_globals_set(old_globals);
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nlr_jump(mp_obj_new_exception_msg(parse_exc_id, parse_exc_msg));
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}
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// compile the imported script
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mp_obj_t module_fun = mp_compile(pn, source_name, false);
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if (module_fun == mp_const_none) {
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// TODO handle compile error correctly
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rt_locals_set(old_locals);
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rt_globals_set(old_globals);
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return mp_const_none;
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}
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// complied successfully, execute it
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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rt_call_function_0(module_fun);
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nlr_pop();
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} else {
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// exception; restore context and re-raise same exception
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rt_locals_set(old_locals);
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rt_globals_set(old_globals);
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nlr_jump(nlr.ret_val);
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}
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rt_locals_set(old_locals);
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rt_globals_set(old_globals);
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return module_obj;
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}
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