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class AbstractProvider(object): """Delegate class to provide requirement interface for the resolver. """ def identify(self, dependency): """Given a dependency, return an identifier for it. This is used in many places to identify the dependency, e.g. whether two requirements should have their specifier parts merged, whether two specifications would conflict with each other (because they the same name but different versions). """ raise NotImplementedError def get_preference(self, resolution, candidates, information): """Produce a sort key for given specification based on preference. The preference is defined as "I think this requirement should be resolved first". The lower the return value is, the more preferred this group of arguments is. :param resolution: Currently pinned candidate, or `None`. :param candidates: A list of possible candidates. :param information: A list of requirement information. Each information instance is a named tuple with two entries: * `requirement` specifies a requirement contributing to the current candidate list * `parent` specifies the candidate that provids (dependend on) the requirement, or `None` to indicate a root requirement. The preference could depend on a various of issues, including (not necessarily in this order): * Is this package pinned in the current resolution result? * How relaxed is the requirement? Stricter ones should probably be worked on first? (I don't know, actually.) * How many possibilities are there to satisfy this requirement? Those with few left should likely be worked on first, I guess? * Are there any known conflicts for this requirement? We should probably work on those with the most known conflicts. A sortable value should be returned (this will be used as the `key` parameter of the built-in sorting function). The smaller the value is, the more preferred this specification is (i.e. the sorting function is called with `reverse=False`). """ raise NotImplementedError def find_matches(self, requirement): """Find all possible candidates that satisfy a requirement. This should try to get candidates based on the requirement's type. For VCS, local, and archive requirements, the one-and-only match is returned, and for a "named" requirement, the index(es) should be consulted to find concrete candidates for this requirement. The returned candidates should be sorted by reversed preference, e.g. the most preferred should be LAST. This is done so list-popping can be as efficient as possible. """ raise NotImplementedError def is_satisfied_by(self, requirement, candidate): """Whether the given requirement can be satisfied by a candidate. A boolean should be returned to indicate whether `candidate` is a viable solution to the requirement. """ raise NotImplementedError def get_dependencies(self, candidate): """Get dependencies of a candidate. This should return a collection of requirements that `candidate` specifies as its dependencies. """ raise NotImplementedError class AbstractResolver(object): """The thing that performs the actual resolution work. """ base_exception = Exception def __init__(self, provider, reporter): self.provider = provider self.reporter = reporter def resolve(self, requirements, **kwargs): """Take a collection of constraints, spit out the resolution result. Parameters ---------- requirements : Collection A collection of constraints kwargs : optional Additional keyword arguments that subclasses may accept. Raises ------ self.base_exception Any raised exception is guaranteed to be a subclass of self.base_exception. The string representation of an exception should be human readable and provide context for why it occurred. Returns ------- retval : object A representation of the final resolution state. It can be any object with a `mapping` attribute that is a Mapping. Other attributes can be used to provide resolver-specific information. The `mapping` attribute MUST be key-value pair is an identifier of a requirement (as returned by the provider's `identify` method) mapped to the resolved candidate (chosen from the return value of the provider's `find_matches` method). """ raise NotImplementedError