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py/objmodule: Support delegating failed attr lookups.

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This commit adds generic support for mutable module attributes on built in
modules, by adding support for an optional hook function for module
attribute lookup.  If a module wants to support additional attribute load/
store/delete (beyond what is in the constant, globals dict) then it should
add at the very end of its globals dict MP_MODULE_ATTR_DELEGATION_ENTRY().
This should point to a custom function which will handle any additional
attributes.

The mp_module_generic_attr() function is provided as a helper function for
additional attributes: it requires an array of qstrs (terminated in
MP_QSTRnull) and a corresponding array of objects (with a 1-1 mapping
between qstrs and objects).  If the qstr is found in the array then the
corresponding object is loaded/stored/deleted.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2021-07-27 00:38:21 +10:00
parent d470c5a5ba
commit 3356b5ef8d
3 changed files with 47 additions and 0 deletions
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5
py/objmodule.h
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@@ -28,6 +28,9 @@
#include "py/obj.h"
// Place at the very end of a module's globals_table.
#define MP_MODULE_ATTR_DELEGATION_ENTRY(ptr) { MP_ROM_QSTR(MP_QSTRnull), MP_ROM_PTR(ptr) }
extern const mp_map_t mp_builtin_module_map;
mp_obj_t mp_module_get_loaded_or_builtin(qstr module_name);
@@ -35,4 +38,6 @@ mp_obj_t mp_module_get_loaded_or_builtin(qstr module_name);
mp_obj_t mp_module_get_builtin(qstr module_name);
#endif
void mp_module_generic_attr(qstr attr, mp_obj_t *dest, const uint16_t *keys, mp_obj_t *values);
#endif // MICROPY_INCLUDED_PY_OBJMODULE_H