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import re
from collections.abc import Mapping, Sequence
from .errors import _ErrorCollector
from .requirements import Requirement
__all__ = [
"CyclicDependencyGroup",
"DependencyGroupInclude",
"DependencyGroupResolver",
"DuplicateGroupNames",
"InvalidDependencyGroupObject",
"resolve_dependency_groups",
]
def __dir__() -> list[str]:
return __all__
# -----------
# Error Types
# -----------
class DuplicateGroupNames(ValueError):
"""
The same dependency groups were defined twice, with different non-normalized names.
"""
class CyclicDependencyGroup(ValueError):
"""
The dependency group includes form a cycle.
"""
def __init__(self, requested_group: str, group: str, include_group: str) -> None:
self.requested_group = requested_group
self.group = group
self.include_group = include_group
if include_group == group:
reason = f"{group} includes itself"
else:
reason = f"{include_group} -> {group}, {group} -> {include_group}"
super().__init__(
"Cyclic dependency group include while resolving "
f"{requested_group}: {reason}"
)
# in the PEP 735 spec, the tables in dependency group lists were described as
# "Dependency Object Specifiers", but the only defined type of object was a
# "Dependency Group Include" -- hence the naming of this error as "Object"
class InvalidDependencyGroupObject(ValueError):
"""
A member of a dependency group was identified as a dict, but was not in a valid
format.
"""
# ------------------------
# Object Model & Interface
# ------------------------
class DependencyGroupInclude:
__slots__ = ("include_group",)
def __init__(self, include_group: str) -> None:
"""
Initialize a DependencyGroupInclude.
:param include_group: The name of the group referred to by this include.
"""
self.include_group = include_group
def __repr__(self) -> str:
return f"{self.__class__.__name__}({self.include_group!r})"
class DependencyGroupResolver:
"""
A resolver for Dependency Group data.
This class handles caching, name normalization, cycle detection, and other
parsing requirements. There are only two public methods for exploring the data:
``lookup()`` and ``resolve()``.
:param dependency_groups: A mapping, as provided via pyproject
``[dependency-groups]``.
"""
def __init__(
self,
dependency_groups: Mapping[str, Sequence[str | Mapping[str, str]]],
) -> None:
errors = _ErrorCollector()
self.dependency_groups = _normalize_group_names(dependency_groups, errors)
# a map of group names to parsed data
self._parsed_groups: dict[
str, tuple[Requirement | DependencyGroupInclude, ...]
] = {}
# a map of group names to their ancestors, used for cycle detection
self._include_graph_ancestors: dict[str, tuple[str, ...]] = {}
# a cache of completed resolutions to Requirement lists
self._resolve_cache: dict[str, tuple[Requirement, ...]] = {}
errors.finalize("[dependency-groups] data was invalid")
def lookup(self, group: str) -> tuple[Requirement | DependencyGroupInclude, ...]:
"""
Lookup a group name, returning the parsed dependency data for that group.
This will not resolve includes.
:param group: the name of the group to lookup
"""
group = _normalize_name(group)
with _ErrorCollector().on_exit(
f"[dependency-groups] data for {group!r} was malformed"
) as errors:
return self._parse_group(group, errors)
def resolve(self, group: str) -> tuple[Requirement, ...]:
"""
Resolve a dependency group to a list of requirements.
:param group: the name of the group to resolve
"""
group = _normalize_name(group)
with _ErrorCollector().on_exit(
f"[dependency-groups] data for {group!r} was malformed"
) as errors:
return self._resolve(group, group, errors)
def _resolve(
self, group: str, requested_group: str, errors: _ErrorCollector
) -> tuple[Requirement, ...]:
"""
This is a helper for cached resolution to strings. It preserves the name of the
group which the user initially requested in order to present a clearer error in
the event that a cycle is detected.
:param group: The normalized name of the group to resolve.
:param requested_group: The group which was used in the original, user-facing
request.
"""
if group in self._resolve_cache:
return self._resolve_cache[group]
parsed = self._parse_group(group, errors)
resolved_group = []
for item in parsed:
if isinstance(item, Requirement):
resolved_group.append(item)
elif isinstance(item, DependencyGroupInclude):
include_group = _normalize_name(item.include_group)
# if a group is cyclic, record the error
# otherwise, follow the include_group reference
#
# this allows us to examine all includes in a group, even in the
# presence of errors
if include_group in self._include_graph_ancestors.get(group, ()):
errors.error(
CyclicDependencyGroup(
requested_group, group, item.include_group
)
)
else:
self._include_graph_ancestors[include_group] = (
*self._include_graph_ancestors.get(group, ()),
group,
)
resolved_group.extend(
self._resolve(include_group, requested_group, errors)
)
else: # pragma: no cover
raise NotImplementedError(
f"Invalid dependency group item after parse: {item}"
)
# in the event that errors were detected, present the group as empty and do not
# cache the result
# this ensures that repeated access to a cyclic group will raise multiple errors
if errors.errors:
return ()
self._resolve_cache[group] = tuple(resolved_group)
return self._resolve_cache[group]
def _parse_group(
self, group: str, errors: _ErrorCollector
) -> tuple[Requirement | DependencyGroupInclude, ...]:
# short circuit -- never do the work twice
if group in self._parsed_groups:
return self._parsed_groups[group]
if group not in self.dependency_groups:
errors.error(LookupError(f"Dependency group '{group}' not found"))
return ()
raw_group = self.dependency_groups[group]
if isinstance(raw_group, str):
errors.error(
TypeError(
f"Dependency group {group!r} contained a string rather than a list."
)
)
return ()
if not isinstance(raw_group, Sequence):
errors.error(
TypeError(f"Dependency group {group!r} is not a sequence type.")
)
return ()
elements: list[Requirement | DependencyGroupInclude] = []
for item in raw_group:
if isinstance(item, str):
# packaging.requirements.Requirement parsing ensures that this is a
# valid PEP 508 Dependency Specifier
# raises InvalidRequirement on failure
elements.append(Requirement(item))
elif isinstance(item, Mapping):
if tuple(item.keys()) != ("include-group",):
errors.error(
InvalidDependencyGroupObject(
f"Invalid dependency group item: {item!r}"
)
)
else:
include_group = item["include-group"]
elements.append(DependencyGroupInclude(include_group=include_group))
else:
errors.error(TypeError(f"Invalid dependency group item: {item!r}"))
self._parsed_groups[group] = tuple(elements)
return self._parsed_groups[group]
# --------------------
# Functional Interface
# --------------------
def resolve_dependency_groups(
dependency_groups: Mapping[str, Sequence[str | Mapping[str, str]]], /, *groups: str
) -> tuple[str, ...]:
"""
Resolve a dependency group to a tuple of requirements, as strings.
:param dependency_groups: the parsed contents of the ``[dependency-groups]`` table
from ``pyproject.toml``
:param groups: the name of the group(s) to resolve
"""
resolver = DependencyGroupResolver(dependency_groups)
return tuple(str(r) for group in groups for r in resolver.resolve(group))
# ----------------
# internal helpers
# ----------------
_NORMALIZE_PATTERN = re.compile(r"[-_.]+")
def _normalize_name(name: str) -> str:
return _NORMALIZE_PATTERN.sub("-", name).lower()
def _normalize_group_names(
dependency_groups: Mapping[str, Sequence[str | Mapping[str, str]]],
errors: _ErrorCollector,
) -> dict[str, Sequence[str | Mapping[str, str]]]:
original_names: dict[str, list[str]] = {}
normalized_groups: dict[str, Sequence[str | Mapping[str, str]]] = {}
for group_name, value in dependency_groups.items():
normed_group_name = _normalize_name(group_name)
original_names.setdefault(normed_group_name, []).append(group_name)
normalized_groups[normed_group_name] = value
for normed_name, names in original_names.items():
if len(names) > 1:
errors.error(
DuplicateGroupNames(
"Duplicate dependency group names: "
f"{normed_name} ({', '.join(names)})"
)
)
return normalized_groups
|