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from itertools import chain |
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from typing import TypeVar, Type, Optional, Set, Tuple, Collection, Sequence |
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from .container import Container |
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from .interfaces import DefinitionsSource, SpecialDepDefinition |
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X = TypeVar("X") |
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def compose(*args: DefinitionsSource) -> Container: |
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combined_sources = _SourceList(*args) |
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_assert_unique_dependencies(args) |
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return Container(container=combined_sources) |
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class _SourceList(DefinitionsSource): |
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""" |
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Combines multiple `DefinitionsSource`s which are accessed in order |
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""" |
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sources: Collection[DefinitionsSource] |
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def __init__(self, *args: DefinitionsSource): |
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self.sources = args |
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def get_definition(self, dep_type: Type[X]) -> Optional[SpecialDepDefinition[X]]: |
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""" |
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For a supplied type returns the definition of how to build that type. |
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If unknown None is returned |
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:param dep_type: |
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""" |
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for source in self.sources: |
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definition = source.get_definition(dep_type) |
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if definition is not None: |
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return definition |
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return None |
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@property |
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def defined_types(self) -> Set[Type]: |
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""" |
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The list of types that have been explicitly defined |
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:return: |
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""" |
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return set(chain.from_iterable(s.defined_types for s in self.sources)) |
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def _assert_unique_dependencies(definition_sources: Sequence[DefinitionsSource]): |
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for first in range(0, len(definition_sources)): |
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for second in range(first + 1, len(definition_sources)): |
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for dep in definition_sources[first].defined_types: |
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if ( |
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dep.__name__ != "ContainerDebugInfo" |
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and dep in definition_sources[second].defined_types |
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): |
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raise ValueError(f"Dep {dep} defined in {first} and {second}") |
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meadsteve /
lagom
