typeshed/stdlib/difflib.pyi

import sys
from collections.abc import Callable, Iterable, Iterator, Sequence
from typing import Any, AnyStr, Generic, NamedTuple, TypeVar, overload

if sys.version_info >= (3, 9):
    from types import GenericAlias

__all__ = [
    "get_close_matches",
    "ndiff",
    "restore",
    "SequenceMatcher",
    "Differ",
    "IS_CHARACTER_JUNK",
    "IS_LINE_JUNK",
    "context_diff",
    "unified_diff",
    "diff_bytes",
    "HtmlDiff",
    "Match",
]

_T = TypeVar("_T")

class Match(NamedTuple):
    a: int
    b: int
    size: int

class SequenceMatcher(Generic[_T]):
    @overload
    def __init__(self, isjunk: Callable[[_T], bool] | None, a: Sequence[_T], b: Sequence[_T], autojunk: bool = ...) -> None: ...
    @overload
    def __init__(self, *, a: Sequence[_T], b: Sequence[_T], autojunk: bool = ...) -> None: ...
    @overload
    def __init__(
        self: SequenceMatcher[str],
        isjunk: Callable[[str], bool] | None = ...,
        a: Sequence[str] = ...,
        b: Sequence[str] = ...,
        autojunk: bool = ...,
    ) -> None: ...
    def set_seqs(self, a: Sequence[_T], b: Sequence[_T]) -> None: ...
    def set_seq1(self, a: Sequence[_T]) -> None: ...
    def set_seq2(self, b: Sequence[_T]) -> None: ...
    if sys.version_info >= (3, 9):
        def find_longest_match(self, alo: int = ..., ahi: int | None = ..., blo: int = ..., bhi: int | None = ...) -> Match: ...
    else:
        def find_longest_match(self, alo: int, ahi: int, blo: int, bhi: int) -> Match: ...

    def get_matching_blocks(self) -> list[Match]: ...
    def get_opcodes(self) -> list[tuple[str, int, int, int, int]]: ...
    def get_grouped_opcodes(self, n: int = ...) -> Iterable[list[tuple[str, int, int, int, int]]]: ...
    def ratio(self) -> float: ...
    def quick_ratio(self) -> float: ...
    def real_quick_ratio(self) -> float: ...
    if sys.version_info >= (3, 9):
        def __class_getitem__(cls, item: Any) -> GenericAlias: ...

# mypy thinks the signatures of the overloads overlap, but the types still work fine
@overload
def get_close_matches(word: AnyStr, possibilities: Iterable[AnyStr], n: int = ..., cutoff: float = ...) -> list[AnyStr]: ...  # type: ignore[misc]
@overload
def get_close_matches(
    word: Sequence[_T], possibilities: Iterable[Sequence[_T]], n: int = ..., cutoff: float = ...
) -> list[Sequence[_T]]: ...

class Differ:
    def __init__(self, linejunk: Callable[[str], bool] | None = ..., charjunk: Callable[[str], bool] | None = ...) -> None: ...
    def compare(self, a: Sequence[str], b: Sequence[str]) -> Iterator[str]: ...

def IS_LINE_JUNK(line: str, pat: Any = ...) -> bool: ...  # pat is undocumented
def IS_CHARACTER_JUNK(ch: str, ws: str = ...) -> bool: ...  # ws is undocumented
def unified_diff(
    a: Sequence[str],
    b: Sequence[str],
    fromfile: str = ...,
    tofile: str = ...,
    fromfiledate: str = ...,
    tofiledate: str = ...,
    n: int = ...,
    lineterm: str = ...,
) -> Iterator[str]: ...
def context_diff(
    a: Sequence[str],
    b: Sequence[str],
    fromfile: str = ...,
    tofile: str = ...,
    fromfiledate: str = ...,
    tofiledate: str = ...,
    n: int = ...,
    lineterm: str = ...,
) -> Iterator[str]: ...
def ndiff(
    a: Sequence[str], b: Sequence[str], linejunk: Callable[[str], bool] | None = ..., charjunk: Callable[[str], bool] | None = ...
) -> Iterator[str]: ...

class HtmlDiff:
    def __init__(
        self,
        tabsize: int = ...,
        wrapcolumn: int | None = ...,
        linejunk: Callable[[str], bool] | None = ...,
        charjunk: Callable[[str], bool] | None = ...,
    ) -> None: ...
    def make_file(
        self,
        fromlines: Sequence[str],
        tolines: Sequence[str],
        fromdesc: str = ...,
        todesc: str = ...,
        context: bool = ...,
        numlines: int = ...,
        *,
        charset: str = ...,
    ) -> str: ...
    def make_table(
        self,
        fromlines: Sequence[str],
        tolines: Sequence[str],
        fromdesc: str = ...,
        todesc: str = ...,
        context: bool = ...,
        numlines: int = ...,
    ) -> str: ...

def restore(delta: Iterable[str], which: int) -> Iterator[str]: ...
def diff_bytes(
    dfunc: Callable[[Sequence[str], Sequence[str], str, str, str, str, int, str], Iterator[str]],
    a: Sequence[bytes],
    b: Sequence[bytes],
    fromfile: bytes = ...,
    tofile: bytes = ...,
    fromfiledate: bytes = ...,
    tofiledate: bytes = ...,
    n: int = ...,
    lineterm: bytes = ...,
) -> Iterator[bytes]: ...