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/*

* This file is part of the Micro Python project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2013, 2014 Damien P. George

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

#include <stdlib.h>

#include <assert.h>

#include "mpconfig.h"

#include "nlr.h"

#include "misc.h"

#include "qstr.h"

#include "obj.h"

#include "objmodule.h"

#include "runtime.h"

#include "builtintables.h"

STATIC mp_map_t mp_loaded_modules_map; // TODO: expose as sys.modules

STATIC void module_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {

mp_obj_module_t *self = self_in;

print(env, "<module '%s' from '-unknown-file-'>", qstr_str(self->name));

}

STATIC void module_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {

mp_obj_module_t *self = self_in;

mp_map_elem_t *elem = mp_map_lookup(&self->globals->map, MP_OBJ_NEW_QSTR(attr), MP_MAP_LOOKUP);

if (elem != NULL) {

dest[0] = elem->value;

}

}

STATIC bool module_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {

mp_obj_module_t *self = self_in;

if (value == MP_OBJ_NULL) {

// delete attribute

mp_obj_dict_delete(self->globals, MP_OBJ_NEW_QSTR(attr));

} else {

// store attribute

// TODO CPython allows STORE_ATTR to a module, but is this the correct implementation?

mp_obj_dict_store(self->globals, MP_OBJ_NEW_QSTR(attr), value);

}

return true;

}

const mp_obj_type_t mp_type_module = {

{ &mp_type_type },

.name = MP_QSTR_module,

.print = module_print,

.load_attr = module_load_attr,

.store_attr = module_store_attr,

};

mp_obj_t mp_obj_new_module(qstr module_name) {

mp_map_elem_t *el = mp_map_lookup(&mp_loaded_modules_map, MP_OBJ_NEW_QSTR(module_name), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND);

// We could error out if module already exists, but let C extensions

// add new members to existing modules.

if (el->value != MP_OBJ_NULL) {

return el->value;

}

// create new module object

mp_obj_module_t *o = m_new_obj(mp_obj_module_t);

o->base.type = &mp_type_module;

o->name = module_name;

o->globals = mp_obj_new_dict(1);

// store __name__ entry in the module

mp_obj_dict_store(o->globals, MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(module_name));

// store the new module into the slot in the global dict holding all modules

el->value = o;

// return the new module

return o;

}

mp_obj_dict_t *mp_obj_module_get_globals(mp_obj_t self_in) {

assert(MP_OBJ_IS_TYPE(self_in, &mp_type_module));

mp_obj_module_t *self = self_in;

return self->globals;

}

/******************************************************************************/

// Global module table and related functions

void mp_module_init(void) {

mp_map_init(&mp_loaded_modules_map, 3);

}

void mp_module_deinit(void) {

mp_map_deinit(&mp_loaded_modules_map);

}

// returns MP_OBJ_NULL if not found

mp_obj_t mp_module_get(qstr module_name) {

// lookup module

mp_map_elem_t *el = mp_map_lookup(&mp_loaded_modules_map, MP_OBJ_NEW_QSTR(module_name), MP_MAP_LOOKUP);

if (el == NULL) {

// module not found, look for builtin module names

el = mp_map_lookup((mp_map_t*)&mp_builtin_module_dict_obj.map, MP_OBJ_NEW_QSTR(module_name), MP_MAP_LOOKUP);

if (el == NULL) {

return MP_OBJ_NULL;

}

}

// module found, return it

return el->value;

}

void mp_module_register(qstr qstr, mp_obj_t module) {

mp_map_lookup(&mp_loaded_modules_map, MP_OBJ_NEW_QSTR(qstr), MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = module;

}