GitPython/git/objects/util.py at main · Unpublished/GitPython · GitHub

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# util.py

# This module is part of GitPython and is released under

# the BSD License: http://www.opensource.org/licenses/bsd-license.php

"""Module for general utility functions"""

# flake8: noqa F401

from abc import ABC, abstractmethod

import warnings

from git.util import IterableList, IterableObj, Actor

import re

from collections import deque

from string import digits

import time

import calendar

from datetime import datetime, timedelta, tzinfo

# typing ------------------------------------------------------------

from typing import (

Any,

Callable,

Deque,

Iterator,

Generic,

NamedTuple,

overload,

Sequence, # NOQA: F401

TYPE_CHECKING,

Tuple,

Type,

TypeVar,

Union,

cast,

)

from git.types import Has_id_attribute, Literal, _T # NOQA: F401

if TYPE_CHECKING:

from io import BytesIO, StringIO

from .commit import Commit

from .blob import Blob

from .tag import TagObject

from .tree import Tree, TraversedTreeTup

from subprocess import Popen

from .submodule.base import Submodule

from git.types import Protocol, runtime_checkable

else:

# Protocol = Generic[_T] # Needed for typing bug #572?

Protocol = ABC

def runtime_checkable(f):

return f

class TraverseNT(NamedTuple):

depth: int

item: Union["Traversable", "Blob"]

src: Union["Traversable", None]

T_TIobj = TypeVar("T_TIobj", bound="TraversableIterableObj") # for TraversableIterableObj.traverse()

TraversedTup = Union[

Tuple[Union["Traversable", None], "Traversable"], # for commit, submodule

"TraversedTreeTup",

] # for tree.traverse()

# --------------------------------------------------------------------

__all__ = (

"get_object_type_by_name",

"parse_date",

"parse_actor_and_date",

"ProcessStreamAdapter",

"Traversable",

"altz_to_utctz_str",

"utctz_to_altz",

"verify_utctz",

"Actor",

"tzoffset",

"utc",

)

ZERO = timedelta(0)

# { Functions

def mode_str_to_int(modestr: Union[bytes, str]) -> int:

"""

:param modestr: string like 755 or 644 or 100644 - only the last 6 chars will be used

:return:

String identifying a mode compatible to the mode methods ids of the

stat module regarding the rwx permissions for user, group and other,

special flags and file system flags, i.e. whether it is a symlink

for example."""

mode = 0

for iteration, char in enumerate(reversed(modestr[-6:])):

char = cast(Union[str, int], char)

mode += int(char) << iteration * 3

# END for each char

return mode

def get_object_type_by_name(

object_type_name: bytes,

) -> Union[Type["Commit"], Type["TagObject"], Type["Tree"], Type["Blob"]]:

"""

:return: type suitable to handle the given object type name.

Use the type to create new instances.

:param object_type_name: Member of TYPES

:raise ValueError: In case object_type_name is unknown"""

if object_type_name == b"commit":

from . import commit

return commit.Commit

elif object_type_name == b"tag":

from . import tag

return tag.TagObject

elif object_type_name == b"blob":

from . import blob

return blob.Blob

elif object_type_name == b"tree":

from . import tree

return tree.Tree

else:

raise ValueError("Cannot handle unknown object type: %s" % object_type_name.decode())

def utctz_to_altz(utctz: str) -> int:

"""Convert a git timezone offset into a timezone offset west of

UTC in seconds (compatible with time.altzone).

:param utctz: git utc timezone string, i.e. +0200

"""

int_utctz = int(utctz)

seconds = ((abs(int_utctz) // 100) * 3600 + (abs(int_utctz) % 100) * 60)

return seconds if int_utctz < 0 else -seconds

def altz_to_utctz_str(altz: int) -> str:

"""Convert a timezone offset west of UTC in seconds into a git timezone offset string

:param altz: timezone offset in seconds west of UTC

"""

hours = abs(altz) // 3600

minutes = (abs(altz) % 3600) // 60

sign = "-" if altz >= 60 else "+"

return "{}{:02}{:02}".format(sign, hours, minutes)

def verify_utctz(offset: str) -> str:

""":raise ValueError: if offset is incorrect

:return: offset"""

fmt_exc = ValueError("Invalid timezone offset format: %s" % offset)

if len(offset) != 5:

raise fmt_exc

if offset[0] not in "+-":

raise fmt_exc

if offset[1] not in digits or offset[2] not in digits or offset[3] not in digits or offset[4] not in digits:

raise fmt_exc

# END for each char

return offset

class tzoffset(tzinfo):

def __init__(self, secs_west_of_utc: float, name: Union[None, str] = None) -> None:

self._offset = timedelta(seconds=-secs_west_of_utc)

self._name = name or "fixed"

def __reduce__(self) -> Tuple[Type["tzoffset"], Tuple[float, str]]:

return tzoffset, (-self._offset.total_seconds(), self._name)

def utcoffset(self, dt: Union[datetime, None]) -> timedelta:

return self._offset

def tzname(self, dt: Union[datetime, None]) -> str:

return self._name

def dst(self, dt: Union[datetime, None]) -> timedelta:

return ZERO

utc = tzoffset(0, "UTC")

def from_timestamp(timestamp: float, tz_offset: float) -> datetime:

"""Converts a timestamp + tz_offset into an aware datetime instance."""

utc_dt = datetime.fromtimestamp(timestamp, utc)

try:

local_dt = utc_dt.astimezone(tzoffset(tz_offset))

return local_dt

except ValueError:

return utc_dt

def parse_date(string_date: Union[str, datetime]) -> Tuple[int, int]:

"""

Parse the given date as one of the following

* aware datetime instance

* Git internal format: timestamp offset

* RFC 2822: Thu, 07 Apr 2005 22:13:13 +0200.

* ISO 8601 2005-04-07T22:13:13

The T can be a space as well

:return: Tuple(int(timestamp_UTC), int(offset)), both in seconds since epoch

:raise ValueError: If the format could not be understood

:note: Date can also be YYYY.MM.DD, MM/DD/YYYY and DD.MM.YYYY.

"""

if isinstance(string_date, datetime):

if string_date.tzinfo:

utcoffset = cast(timedelta, string_date.utcoffset()) # typeguard, if tzinfoand is not None

offset = -int(utcoffset.total_seconds())

return int(string_date.astimezone(utc).timestamp()), offset

else:

raise ValueError(f"string_date datetime object without tzinfo, {string_date}")

# git time

try:

if string_date.count(" ") == 1 and string_date.rfind(":") == -1:

timestamp, offset_str = string_date.split()

if timestamp.startswith("@"):

timestamp = timestamp[1:]

timestamp_int = int(timestamp)

return timestamp_int, utctz_to_altz(verify_utctz(offset_str))

else:

offset_str = "+0000" # local time by default

if string_date[-5] in "-+":

offset_str = verify_utctz(string_date[-5:])

string_date = string_date[:-6] # skip space as well

# END split timezone info

offset = utctz_to_altz(offset_str)

# now figure out the date and time portion - split time

date_formats = []

splitter = -1

if "," in string_date:

date_formats.append("%a, %d %b %Y")

splitter = string_date.rfind(" ")

else:

# iso plus additional

date_formats.append("%Y-%m-%d")

date_formats.append("%Y.%m.%d")

date_formats.append("%m/%d/%Y")

date_formats.append("%d.%m.%Y")

splitter = string_date.rfind("T")

if splitter == -1:

splitter = string_date.rfind(" ")

# END handle 'T' and ' '

# END handle rfc or iso

assert splitter > -1

# split date and time

time_part = string_date[splitter + 1 :] # skip space

date_part = string_date[:splitter]

# parse time

tstruct = time.strptime(time_part, "%H:%M:%S")

for fmt in date_formats:

try:

dtstruct = time.strptime(date_part, fmt)

utctime = calendar.timegm(

(

dtstruct.tm_year,

dtstruct.tm_mon,

dtstruct.tm_mday,

tstruct.tm_hour,

tstruct.tm_min,

tstruct.tm_sec,

dtstruct.tm_wday,

dtstruct.tm_yday,

tstruct.tm_isdst,

)

return int(utctime), offset

except ValueError:

continue

# END exception handling

# END for each fmt

# still here ? fail

raise ValueError("no format matched")

# END handle format

except Exception as e:

raise ValueError(f"Unsupported date format or type: {string_date}, type={type(string_date)}") from e

# END handle exceptions

# precompiled regex

_re_actor_epoch = re.compile(r"^.+? (.*) (\d+) ([+-]\d+).*$")

_re_only_actor = re.compile(r"^.+? (.*)$")

def parse_actor_and_date(line: str) -> Tuple[Actor, int, int]:

"""Parse out the actor (author or committer) info from a line like::

author Tom Preston-Werner <tom@mojombo.com> 1191999972 -0700

:return: [Actor, int_seconds_since_epoch, int_timezone_offset]"""

actor, epoch, offset = "", "0", "0"

m = _re_actor_epoch.search(line)

if m:

actor, epoch, offset = m.groups()

else:

m = _re_only_actor.search(line)

actor = m.group(1) if m else line or ""

return (Actor._from_string(actor), int(epoch), utctz_to_altz(offset))

# } END functions

# { Classes

class ProcessStreamAdapter(object):

"""Class wireing all calls to the contained Process instance.

Use this type to hide the underlying process to provide access only to a specified

stream. The process is usually wrapped into an AutoInterrupt class to kill

it if the instance goes out of scope."""

__slots__ = ("_proc", "_stream")

def __init__(self, process: "Popen", stream_name: str) -> None:

self._proc = process

self._stream: StringIO = getattr(process, stream_name) # guessed type

def __getattr__(self, attr: str) -> Any:

return getattr(self._stream, attr)

@runtime_checkable

class Traversable(Protocol):

"""Simple interface to perform depth-first or breadth-first traversals

into one direction.

Subclasses only need to implement one function.

Instances of the Subclass must be hashable

Defined subclasses = [Commit, Tree, SubModule]

"""

__slots__ = ()

@classmethod

@abstractmethod

def _get_intermediate_items(cls, item: Any) -> Sequence["Traversable"]:

"""

Returns:

Tuple of items connected to the given item.

Must be implemented in subclass

class Commit:: (cls, Commit) -> Tuple[Commit, ...]

class Submodule:: (cls, Submodule) -> Iterablelist[Submodule]

class Tree:: (cls, Tree) -> Tuple[Tree, ...]

"""

raise NotImplementedError("To be implemented in subclass")

@abstractmethod

def list_traverse(self, *args: Any, **kwargs: Any) -> Any:

""" """

warnings.warn(

"list_traverse() method should only be called from subclasses."

"Calling from Traversable abstract class will raise NotImplementedError in 3.1.20"

"Builtin sublclasses are 'Submodule', 'Tree' and 'Commit",

DeprecationWarning,

stacklevel=2,

)

return self._list_traverse(*args, **kwargs)

def _list_traverse(

self, as_edge: bool = False, *args: Any, **kwargs: Any

) -> IterableList[Union["Commit", "Submodule", "Tree", "Blob"]]:

"""

:return: IterableList with the results of the traversal as produced by

traverse()

Commit -> IterableList['Commit']

Submodule -> IterableList['Submodule']

Tree -> IterableList[Union['Submodule', 'Tree', 'Blob']]

"""

# Commit and Submodule have id.__attribute__ as IterableObj

# Tree has id.__attribute__ inherited from IndexObject

if isinstance(self, Has_id_attribute):

id = self._id_attribute_

else:

id = "" # shouldn't reach here, unless Traversable subclass created with no _id_attribute_

# could add _id_attribute_ to Traversable, or make all Traversable also Iterable?

if not as_edge:

out: IterableList[Union["Commit", "Submodule", "Tree", "Blob"]] = IterableList(id)

out.extend(self.traverse(as_edge=as_edge, *args, **kwargs))

return out

# overloads in subclasses (mypy doesn't allow typing self: subclass)

# Union[IterableList['Commit'], IterableList['Submodule'], IterableList[Union['Submodule', 'Tree', 'Blob']]]

else:

# Raise deprecationwarning, doesn't make sense to use this

out_list: IterableList = IterableList(self.traverse(*args, **kwargs))

return out_list

@abstractmethod

def traverse(self, *args: Any, **kwargs: Any) -> Any:

""" """

warnings.warn(

"traverse() method should only be called from subclasses."

"Calling from Traversable abstract class will raise NotImplementedError in 3.1.20"

"Builtin sublclasses are 'Submodule', 'Tree' and 'Commit",

DeprecationWarning,

stacklevel=2,

)

return self._traverse(*args, **kwargs)

def _traverse(

self,

predicate: Callable[[Union["Traversable", "Blob", TraversedTup], int], bool] = lambda i, d: True,

prune: Callable[[Union["Traversable", "Blob", TraversedTup], int], bool] = lambda i, d: False,

depth: int = -1,

branch_first: bool = True,

visit_once: bool = True,

ignore_self: int = 1,

as_edge: bool = False,

) -> Union[Iterator[Union["Traversable", "Blob"]], Iterator[TraversedTup]]:

""":return: iterator yielding of items found when traversing self

:param predicate: f(i,d) returns False if item i at depth d should not be included in the result

:param prune:

f(i,d) return True if the search should stop at item i at depth d.

Item i will not be returned.

:param depth:

define at which level the iteration should not go deeper

if -1, there is no limit

if 0, you would effectively only get self, the root of the iteration

i.e. if 1, you would only get the first level of predecessors/successors

:param branch_first:

if True, items will be returned branch first, otherwise depth first

:param visit_once:

if True, items will only be returned once, although they might be encountered

several times. Loops are prevented that way.

:param ignore_self:

if True, self will be ignored and automatically pruned from

the result. Otherwise it will be the first item to be returned.

If as_edge is True, the source of the first edge is None

:param as_edge:

if True, return a pair of items, first being the source, second the

destination, i.e. tuple(src, dest) with the edge spanning from

source to destination"""

"""

Commit -> Iterator[Union[Commit, Tuple[Commit, Commit]]

Submodule -> Iterator[Submodule, Tuple[Submodule, Submodule]]

Tree -> Iterator[Union[Blob, Tree, Submodule,

Tuple[Union[Submodule, Tree], Union[Blob, Tree, Submodule]]]

ignore_self=True is_edge=True -> Iterator[item]

ignore_self=True is_edge=False --> Iterator[item]

ignore_self=False is_edge=True -> Iterator[item] | Iterator[Tuple[src, item]]

ignore_self=False is_edge=False -> Iterator[Tuple[src, item]]"""

visited = set()

stack: Deque[TraverseNT] = deque()

stack.append(TraverseNT(0, self, None)) # self is always depth level 0

def addToStack(

stack: Deque[TraverseNT],

src_item: "Traversable",

branch_first: bool,

depth: int,

) -> None:

lst = self._get_intermediate_items(item)

if not lst: # empty list

return None

if branch_first:

stack.extendleft(TraverseNT(depth, i, src_item) for i in lst)

else:

reviter = (TraverseNT(depth, lst[i], src_item) for i in range(len(lst) - 1, -1, -1))

stack.extend(reviter)

# END addToStack local method

while stack:

d, item, src = stack.pop() # depth of item, item, item_source

if visit_once and item in visited:

continue

if visit_once:

visited.add(item)

rval: Union[TraversedTup, "Traversable", "Blob"]

if as_edge: # if as_edge return (src, item) unless rrc is None (e.g. for first item)

rval = (src, item)

else:

rval = item

if prune(rval, d):

continue

skipStartItem = ignore_self and (item is self)

if not skipStartItem and predicate(rval, d):

yield rval

# only continue to next level if this is appropriate !

nd = d + 1

if depth > -1 and nd > depth:

continue

addToStack(stack, item, branch_first, nd)

# END for each item on work stack

@runtime_checkable

class Serializable(Protocol):

"""Defines methods to serialize and deserialize objects from and into a data stream"""

__slots__ = ()

# @abstractmethod

def _serialize(self, stream: "BytesIO") -> "Serializable":

"""Serialize the data of this object into the given data stream

:note: a serialized object would ``_deserialize`` into the same object

:param stream: a file-like object

:return: self"""

raise NotImplementedError("To be implemented in subclass")

# @abstractmethod

def _deserialize(self, stream: "BytesIO") -> "Serializable":

"""Deserialize all information regarding this object from the stream

:param stream: a file-like object

:return: self"""

raise NotImplementedError("To be implemented in subclass")

class TraversableIterableObj(IterableObj, Traversable):

__slots__ = ()

TIobj_tuple = Tuple[Union[T_TIobj, None], T_TIobj]

def list_traverse(self: T_TIobj, *args: Any, **kwargs: Any) -> IterableList[T_TIobj]:

return super(TraversableIterableObj, self)._list_traverse(*args, **kwargs)

@overload # type: ignore

def traverse(self: T_TIobj) -> Iterator[T_TIobj]:

...

@overload

def traverse(

self: T_TIobj,

predicate: Callable[[Union[T_TIobj, Tuple[Union[T_TIobj, None], T_TIobj]], int], bool],

prune: Callable[[Union[T_TIobj, Tuple[Union[T_TIobj, None], T_TIobj]], int], bool],

depth: int,

branch_first: bool,

visit_once: bool,

ignore_self: Literal[True],

as_edge: Literal[False],

) -> Iterator[T_TIobj]:

...

@overload

def traverse(

self: T_TIobj,

predicate: Callable[[Union[T_TIobj, Tuple[Union[T_TIobj, None], T_TIobj]], int], bool],

prune: Callable[[Union[T_TIobj, Tuple[Union[T_TIobj, None], T_TIobj]], int], bool],

depth: int,

branch_first: bool,

visit_once: bool,

ignore_self: Literal[False],

as_edge: Literal[True],

) -> Iterator[Tuple[Union[T_TIobj, None], T_TIobj]]:

...

@overload

def traverse(

self: T_TIobj,

predicate: Callable[[Union[T_TIobj, TIobj_tuple], int], bool],

prune: Callable[[Union[T_TIobj, TIobj_tuple], int], bool],

depth: int,

branch_first: bool,

visit_once: bool,

ignore_self: Literal[True],

as_edge: Literal[True],

) -> Iterator[Tuple[T_TIobj, T_TIobj]]:

...

def traverse(

self: T_TIobj,

predicate: Callable[[Union[T_TIobj, TIobj_tuple], int], bool] = lambda i, d: True,

prune: Callable[[Union[T_TIobj, TIobj_tuple], int], bool] = lambda i, d: False,

depth: int = -1,

branch_first: bool = True,

visit_once: bool = True,

ignore_self: int = 1,

as_edge: bool = False,

) -> Union[Iterator[T_TIobj], Iterator[Tuple[T_TIobj, T_TIobj]], Iterator[TIobj_tuple]]:

"""For documentation, see util.Traversable._traverse()"""

"""

# To typecheck instead of using cast.

import itertools

from git.types import TypeGuard

def is_commit_traversed(inp: Tuple) -> TypeGuard[Tuple[Iterator[Tuple['Commit', 'Commit']]]]:

for x in inp[1]:

if not isinstance(x, tuple) and len(x) != 2:

if all(isinstance(inner, Commit) for inner in x):

continue

return True

ret = super(Commit, self).traverse(predicate, prune, depth, branch_first, visit_once, ignore_self, as_edge)

ret_tup = itertools.tee(ret, 2)

assert is_commit_traversed(ret_tup), f"{[type(x) for x in list(ret_tup[0])]}"

return ret_tup[0]

"""

return cast(

Union[Iterator[T_TIobj], Iterator[Tuple[Union[None, T_TIobj], T_TIobj]]],

super(TraversableIterableObj, self)._traverse(

predicate, prune, depth, branch_first, visit_once, ignore_self, as_edge # type: ignore

)

GitPython/git/objects/util.py at main · Unpublished/GitPython · GitHub

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