diff options
Diffstat (limited to 'lib/private/dict_subject.bzl')
| -rw-r--r-- | lib/private/dict_subject.bzl | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/private/dict_subject.bzl b/lib/private/dict_subject.bzl index 48d9463..f155a17 100644 --- a/lib/private/dict_subject.bzl +++ b/lib/private/dict_subject.bzl @@ -39,10 +39,13 @@ def _dict_subject_new(actual, meta, container_name = "dict", key_plural_name = " # buildifier: disable=uninitialized public = struct( + # keep sorted start contains_exactly = lambda *a, **k: _dict_subject_contains_exactly(self, *a, **k), contains_at_least = lambda *a, **k: _dict_subject_contains_at_least(self, *a, **k), contains_none_of = lambda *a, **k: _dict_subject_contains_none_of(self, *a, **k), + get = lambda *a, **k: _dict_subject_get(self, *a, **k), keys = lambda *a, **k: _dict_subject_keys(self, *a, **k), + # keep sorted end ) self = struct( actual = actual, @@ -152,6 +155,25 @@ def _dict_subject_contains_none_of(self, none_of): actual = "actual: {{\n{}\n}}".format(format_dict_as_lines(self.actual)), ) +def _dict_subject_get(self, key, *, factory): + """Gets `key` from the actual dict wrapped in a subject. + + Args: + self: implicitly added. + key: ([`object`]) the key to fetch. + factory: ([`callable`]) subject factory function, with the signature + of `def factory(value, *, meta)`, and returns the wrapped value. + + Returns: + The return value of the `factory` arg. + """ + if key not in self.actual: + fail("KeyError: '{key}' not found in {expr}".format( + key = key, + expr = self.meta.current_expr(), + )) + return factory(self.actual[key], meta = self.meta.derive("get({})".format(key))) + def _dict_subject_keys(self): """Returns a `CollectionSubject` for the dict's keys. |