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py: Implement "from pkg import mod" variant of import.

This commit is contained in:
Paul Sokolovsky 2014-04-12 00:15:19 +03:00
parent 13d52df4c5
commit af620abcb5
2 changed files with 44 additions and 6 deletions
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44
py/runtime.c
View File

@ -1043,13 +1043,45 @@ mp_obj_t mp_import_name(qstr name, mp_obj_t fromlist, mp_obj_t level) {
mp_obj_t mp_import_from(mp_obj_t module, qstr name) {
DEBUG_printf("import from %p %s\n", module, qstr_str(name));
mp_obj_t x = mp_load_attr(module, name);
/* TODO convert AttributeError to ImportError
if (fail) {
(ImportError, "cannot import name %s", qstr_str(name), NULL)
mp_obj_t dest[2];
mp_load_method_maybe(module, name, dest);
if (dest[1] != MP_OBJ_NULL) {
// Hopefully we can't import bound method from an object
import_error:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ImportError, "Cannot import name '%s'", qstr_str(name)));
}
*/
return x;
if (dest[0] != MP_OBJ_NULL) {
return dest[0];
}
// See if it's a package, then can try FS import
mp_load_method_maybe(module, MP_QSTR___path__, dest);
if (dest[0] == MP_OBJ_NULL) {
goto import_error;
}
mp_load_method_maybe(module, MP_QSTR___name__, dest);
uint pkg_name_len;
const char *pkg_name = mp_obj_str_get_data(dest[0], &pkg_name_len);
char dot_name[pkg_name_len + 1 + qstr_len(name)];
memcpy(dot_name, pkg_name, pkg_name_len);
dot_name[pkg_name_len] = '.';
memcpy(dot_name + pkg_name_len + 1, qstr_str(name), qstr_len(name));
qstr dot_name_q = qstr_from_strn(dot_name, sizeof(dot_name));
mp_obj_t args[5];
args[0] = MP_OBJ_NEW_QSTR(dot_name_q);
args[1] = mp_const_none; // TODO should be globals
args[2] = mp_const_none; // TODO should be locals
args[3] = mp_const_true; // Pass sentinel "non empty" value to force returning of leaf module
args[4] = 0;
// TODO lookup __import__ and call that instead of going straight to builtin implementation
return mp_builtin___import__(5, args);
}
void mp_import_all(mp_obj_t module) {

6
tests/basics/import-pkg3.py Normal file
View File

@ -0,0 +1,6 @@
from pkg import mod
print(mod.foo())
import pkg.mod
print(mod is pkg.mod)