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File Name : _implementation.py

from __future__ import annotations

import dataclasses
import re
from collections.abc import Mapping

from pip._vendor.packaging.requirements import Requirement

def _normalize_name(name: str) -> str:
    return re.sub(r"[-_.]+", "-", name).lower()

def _normalize_group_names(
    dependency_groups: Mapping[str, str | Mapping[str, str]],
) -> Mapping[str, str | Mapping[str, str]]:
    original_names: dict[str, list[str]] = {}
    normalized_groups = {}

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

errors = []
    for normed_name, names in original_names.items():
        if len(names) > 1:
            errors.append(f"{normed_name} ({', '.join(names)})")
    if errors:
        raise ValueError(f"Duplicate dependency group names: {', '.join(errors)}")

return normalized_groups

@dataclasses.dataclass
class DependencyGroupInclude:
    include_group: str

class CyclicDependencyError(ValueError):
    """
    An error representing the detection of 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}"
        )

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, str | Mapping[str, str]],
    ) -> None:
        if not isinstance(dependency_groups, Mapping):
            raise TypeError("Dependency Groups table is not a mapping")
        self.dependency_groups = _normalize_group_names(dependency_groups)
        # 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, ...]] = {}

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

:raises ValueError: if the data does not appear to be valid dependency group
            data
        :raises TypeError: if the data is not a string
        :raises LookupError: if group name is absent
        :raises packaging.requirements.InvalidRequirement: if a specifier is not valid
        """
        if not isinstance(group, str):
            raise TypeError("Dependency group name is not a str")
        group = _normalize_name(group)
        return self._parse_group(group)

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

:raises TypeError: if the inputs appear to be the wrong types
        :raises ValueError: if the data does not appear to be valid dependency group
            data
        :raises LookupError: if group name is absent
        :raises packaging.requirements.InvalidRequirement: if a specifier is not valid
        """
        if not isinstance(group, str):
            raise TypeError("Dependency group name is not a str")
        group = _normalize_name(group)
        return self._resolve(group, group)

def _parse_group(
        self, group: str
    ) -> 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:
            raise LookupError(f"Dependency group '{group}' not found")

raw_group = self.dependency_groups[group]
        if not isinstance(raw_group, list):
            raise TypeError(f"Dependency group '{group}' is not a list")

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, dict):
                if tuple(item.keys()) != ("include-group",):
                    raise ValueError(f"Invalid dependency group item: {item}")

include_group = next(iter(item.values()))
                elements.append(DependencyGroupInclude(include_group=include_group))
            else:
                raise ValueError(f"Invalid dependency group item: {item}")

self._parsed_groups[group] = tuple(elements)
        return self._parsed_groups[group]

def _resolve(self, group: str, requested_group: str) -> tuple[Requirement, ...]:
        """
        This is a helper for cached resolution to strings.

:param group: The 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)

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 include_group in self._include_graph_ancestors.get(group, ()):
                    raise CyclicDependencyError(
                        requested_group, group, item.include_group
                    )
                self._include_graph_ancestors[include_group] = (
                    *self._include_graph_ancestors.get(group, ()),
                    group,
                )
                resolved_group.extend(self._resolve(include_group, requested_group))
            else:  # unreachable
                raise NotImplementedError(
                    f"Invalid dependency group item after parse: {item}"
                )

self._resolve_cache[group] = tuple(resolved_group)
        return self._resolve_cache[group]

def resolve(
    dependency_groups: Mapping[str, 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

:raises TypeError: if the inputs appear to be the wrong types
    :raises ValueError: if the data does not appear to be valid dependency group data
    :raises LookupError: if group name is absent
    :raises packaging.requirements.InvalidRequirement: if a specifier is not valid
    """
    resolver = DependencyGroupResolver(dependency_groups)
    return tuple(str(r) for group in groups for r in resolver.resolve(group))

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-05-23 06:37:30
..	dir	-	root/root	0755	2025-05-23 06:37:30
__pycache__	dir	-	root/root	0755	2025-05-23 06:37:30
__init__.py	text/x-script.python	250 B	root/root	0644	2025-05-23 06:37:29
__main__.py	text/x-script.python	1.67 KB	root/root	0644	2025-05-23 06:37:29
_implementation.py	text/x-script.python	7.85 KB	root/root	0644	2025-05-23 06:37:29
_lint_dependency_groups.py	text/x-script.python	1.67 KB	root/root	0644	2025-05-23 06:37:29
_pip_wrapper.py	text/x-script.python	1.82 KB	root/root	0644	2025-05-23 06:37:29
_toml_compat.py	text/x-script.python	285 B	root/root	0644	2025-05-23 06:37:29
py.typed	application/x-empty	0 B	root/root	0644	2025-05-23 06:37:29

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