diff options
Diffstat (limited to 'mesonbuild/interpreterbase.py')
| -rw-r--r-- | mesonbuild/interpreterbase.py | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/mesonbuild/interpreterbase.py b/mesonbuild/interpreterbase.py index 750101e..c887115 100644 --- a/mesonbuild/interpreterbase.py +++ b/mesonbuild/interpreterbase.py @@ -419,7 +419,9 @@ class KwargInfo(T.Generic[_T]): :param listify: If true, then the argument will be listified before being checked. This is useful for cases where the Meson DSL allows a scalar or a container, but internally we only want to work with containers - :param default: A default value to use if this isn't set. defaults to None + :param default: A default value to use if this isn't set. defaults to None, + this may be safely set to a mutable type, as long as that type does not + itself contain mutable types, typed_kwargs will copy the default :param since: Meson version in which this argument has been added. defaults to None :param deprecated: Meson version in which this argument has been deprecated. defaults to None """ @@ -444,6 +446,9 @@ def typed_kwargs(name: str, *types: KwargInfo) -> T.Callable[..., T.Any]: information. For non-required values it sets the value to a default, which means the value will always be provided. + If type tyhpe is a :class:ContainerTypeInfo, then the default value will be + passed as an argument to the container initializer, making a shallow copy + :param name: the name of the function, including the object it's attached ot (if applicable) :param *types: KwargInfo entries for each keyword argument. @@ -491,7 +496,13 @@ def typed_kwargs(name: str, *types: KwargInfo) -> T.Callable[..., T.Any]: else: # set the value to the default, this ensuring all kwargs are present # This both simplifies the typing checking and the usage - kwargs[info.name] = info.default + # Create a shallow copy of the container (and do a type + # conversion if necessary). This allows mutable types to + # be used safely as default values + if isinstance(info.types, ContainerTypeInfo): + kwargs[info.name] = info.types.container(info.default) + else: + kwargs[info.name] = info.default return f(*wrapped_args, **wrapped_kwargs) return T.cast(TV_func, wrapper) |