Add stubs for dockerfile-parse (#9305)

Co-authored-by: AlexWaygood <alex.waygood@gmail.com>

stubs/dockerfile-parse/@tests/stubtest_allowlist.txt

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+# These are re-exports which we consider an implementation detail
+dockerfile_parse.constants.version_info
+dockerfile_parse.parser.string_types
+dockerfile_parse.parser.DOCKERFILE_FILENAME
+dockerfile_parse.parser.COMMENT_INSTRUCTION
+dockerfile_parse.util.PY2

stubs/dockerfile-parse/METADATA.toml

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+version = "1.2.*"
+requires = ["types-six"]
+
+[tool.stubtest]
+ignore_missing_stub = false

stubs/dockerfile-parse/dockerfile_parse/__init__.pyi

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+from .parser import DockerfileParser as DockerfileParser
+
+__version__: str

stubs/dockerfile-parse/dockerfile_parse/constants.pyi

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+from typing_extensions import Literal
+
+PY2: Literal[False]
+DOCKERFILE_FILENAME: str
+COMMENT_INSTRUCTION: str

stubs/dockerfile-parse/dockerfile_parse/parser.pyi

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+from collections.abc import Mapping, Sequence
+from typing import IO, ClassVar
+from typing_extensions import TypedDict
+
+from .util import Context
+
+class KeyValues(dict[str, str]):
+    parser_attr: ClassVar[str | None]
+    parser: DockerfileParser
+    def __init__(self, key_values: Mapping[str, str], parser: DockerfileParser) -> None: ...
+    def __delitem__(self, key: str) -> None: ...
+    def __setitem__(self, key: str, value: str) -> None: ...
+    def __eq__(self, other: object) -> bool: ...
+    def __hash__(self) -> int: ...  # type: ignore[override]
+
+class Labels(KeyValues): ...
+class Envs(KeyValues): ...
+class Args(KeyValues): ...
+
+class _InstructionDict(TypedDict):
+    instruction: str
+    startline: int
+    endline: int
+    content: str
+    value: str
+
+class DockerfileParser:
+    fileobj: IO[str]
+    dockerfile_path: str
+    cache_content: bool
+    cached_content: str
+    env_replace: bool
+    parent_env: dict[str, str]
+    build_args: dict[str, str]
+    def __init__(
+        self,
+        path: str | None = ...,
+        cache_content: bool = ...,
+        env_replace: bool = ...,
+        parent_env: dict[str, str] | None = ...,
+        fileobj: IO[str] | None = ...,
+        build_args: dict[str, str] | None = ...,
+    ) -> None: ...
+    lines: list[str]
+    content: str
+    @property
+    def structure(self) -> list[_InstructionDict]: ...
+    @property
+    def json(self) -> str: ...
+    parent_images: Sequence[str]
+    @property
+    def is_multistage(self) -> bool: ...
+    baseimage: str
+    cmd: str
+    labels: Mapping[str, str]
+    envs: Mapping[str, str]
+    args: Mapping[str, str]
+    def add_lines(
+        self, *lines: str, all_stages: bool | None = ..., at_start: bool | None = ..., skip_scratch: bool | None = ...
+    ) -> None: ...
+    def add_lines_at(
+        self, anchor: str | int | dict[str, int], *lines: str, replace: bool | None = ..., after: bool | None = ...
+    ) -> None: ...
+    @property
+    def context_structure(self) -> list[Context]: ...
+
+def image_from(from_value: str) -> tuple[str | None, str | None]: ...

stubs/dockerfile-parse/dockerfile_parse/util.pyi

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+from collections.abc import Generator, Mapping, MutableMapping
+from io import StringIO
+from typing import ClassVar
+from typing_extensions import Literal, TypeAlias
+
+def b2u(string: bytes | str) -> str: ...
+def u2b(string: str | bytes) -> bytes: ...
+
+_Quotes: TypeAlias = Literal["'", '"']
+_ContextType: TypeAlias = Literal["ARG", "ENV", "LABEL"]
+
+class WordSplitter:
+    SQUOTE: ClassVar[_Quotes]
+    DQUOTE: ClassVar[_Quotes]
+    stream: StringIO
+    args: Mapping[str, str] | None
+    envs: Mapping[str, str] | None
+    quotes: _Quotes | None
+    escaped: bool
+    def __init__(self, s: str, args: Mapping[str, str] | None = ..., envs: Mapping[str, str] | None = ...) -> None: ...
+    def dequote(self) -> str: ...
+    def split(self, maxsplit: int | None = ..., dequote: bool = ...) -> Generator[str | None, None, None]: ...
+
+def extract_key_values(env_replace: bool, args: Mapping[str, str], envs: Mapping[str, str], instruction_value: str): ...
+def get_key_val_dictionary(
+    instruction_value, env_replace: bool = ..., args: Mapping[str, str] | None = ..., envs: Mapping[str, str] | None = ...
+): ...
+
+class Context:
+    args: MutableMapping[str, str]
+    envs: MutableMapping[str, str]
+    labels: MutableMapping[str, str]
+    line_args: Mapping[str, str]
+    line_envs: Mapping[str, str]
+    line_labels: Mapping[str, str]
+    def __init__(
+        self,
+        args: MutableMapping[str, str] | None = ...,
+        envs: MutableMapping[str, str] | None = ...,
+        labels: MutableMapping[str, str] | None = ...,
+        line_args: Mapping[str, str] | None = ...,
+        line_envs: Mapping[str, str] | None = ...,
+        line_labels: Mapping[str, str] | None = ...,
+    ) -> None: ...
+    def set_line_value(self, context_type: _ContextType, value: Mapping[str, str]) -> None: ...
+    def get_line_value(self, context_type: _ContextType) -> Mapping[str, str]: ...
+    def get_values(self, context_type: _ContextType) -> Mapping[str, str]: ...