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import dataclasses
from typing import (
TypeVar,
TYPE_CHECKING,
Tuple,
Dict,
Optional,
TypedDict,
NotRequired,
List,
)
from collections.abc import Sequence, Mapping, MutableMapping
if TYPE_CHECKING:
from debputy.plugin.api import VirtualPath
from debputy.filesystem_scan import FSPath
VP = TypeVar("VP", VirtualPath, FSPath)
S = TypeVar("S", str, bytes)
else:
VP = TypeVar("VP", "VirtualPath", "FSPath")
S = TypeVar("S", str, bytes)
class EnvironmentModificationSerialized(TypedDict):
replacements: NotRequired[dict[str, str]]
removals: NotRequired[list[str]]
@dataclasses.dataclass(slots=True, frozen=True)
class EnvironmentModification:
replacements: Sequence[tuple[str, str]] = tuple()
removals: Sequence[str] = tuple()
def __bool__(self) -> bool:
return bool(self.removals) or bool(self.replacements)
def combine(
self,
other: "Optional[EnvironmentModification]",
) -> "EnvironmentModification":
if not other:
return self
existing_replacements = {k: v for k, v in self.replacements}
extra_replacements = {
k: v
for k, v in other.replacements
if k not in existing_replacements or existing_replacements[k] != v
}
seen_removals = set(self.removals)
extra_removals = [r for r in other.removals if r not in seen_removals]
if not extra_replacements and isinstance(self.replacements, tuple):
new_replacements = self.replacements
else:
combined_replacements = []
for k, v in existing_replacements.items():
if k not in extra_replacements:
combined_replacements.append((k, v))
for k, v in other.replacements:
if k in extra_replacements:
combined_replacements.append((k, v))
new_replacements = tuple(combined_replacements)
if not extra_removals and isinstance(self.removals, tuple):
new_removals = self.removals
else:
combined_removals = list(self.removals)
combined_removals.extend(extra_removals)
new_removals = tuple(combined_removals)
if self.replacements is new_replacements and self.removals is new_removals:
return self
return EnvironmentModification(
new_replacements,
new_removals,
)
def update_inplace(self, env: MutableMapping[str, str]) -> None:
for k, v in self.replacements:
existing_value = env.get(k)
if v == existing_value:
continue
env[k] = v
for k in self.removals:
if k not in env:
continue
del env[k]
def compute_env(self, base_env: Mapping[str, str]) -> Mapping[str, str]:
updated_env: dict[str, str] | None = None
for k, v in self.replacements:
existing_value = base_env.get(k)
if v == existing_value:
continue
if updated_env is None:
updated_env = dict(base_env)
updated_env[k] = v
for k in self.removals:
if k not in base_env:
continue
if updated_env is None:
updated_env = dict(base_env)
del updated_env[k]
if updated_env is not None:
return updated_env
return base_env
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