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Add empty (false) value testing for strings, tuples, lists, dicts.

This commit is contained in:
Paul Sokolovsky 2014-01-16 23:54:17 +02:00
parent eea2eb1bb7
commit 10744dd816
2 changed files with 45 additions and 0 deletions
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18
py/runtime.c
View File

@ -297,6 +297,24 @@ int rt_is_true(mp_obj_t arg) {
return 0;
} else if (arg == mp_const_true) {
return 1;
} else if (MP_OBJ_IS_QSTR(arg)) {
// TODO: \0
return *qstr_str(MP_OBJ_QSTR_VALUE(arg)) != 0;
} else if (MP_OBJ_IS_TYPE(arg, &str_type)) {
// TODO: \0
return *qstr_str(mp_obj_str_get(arg)) != 0;
} else if (MP_OBJ_IS_TYPE(arg, &list_type)) {
uint len;
mp_obj_t *dummy;
mp_obj_list_get(arg, &len, &dummy);
return len != 0;
} else if (MP_OBJ_IS_TYPE(arg, &tuple_type)) {
uint len;
mp_obj_t *dummy;
mp_obj_tuple_get(arg, &len, &dummy);
return len != 0;
} else if (MP_OBJ_IS_TYPE(arg, &dict_type)) {
return mp_obj_dict_len(arg) != 0;
} else {
assert(0);
return 0;

27
tests/basics/tests/true-value.py Normal file
View File

@ -0,0 +1,27 @@
# Test true-ish value handling
if not False:
print("False")
if not 0:
print("0")
if not "":
print("Empty string")
if "foo":
print("Non-empty string")
if not ():
print("Empty tuple")
if ("",):
print("Non-empty tuple")
if not []:
print("Empty list")
if [0]:
print("Non-empty list")
if not {}:
print("Empty dict")
if {0:0}:
print("Non-empty dict")