GitPython/git/objects/tree.py at main · Unpublished/GitPython · GitHub

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# tree.py

# This module is part of GitPython and is released under

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

from git.util import IterableList, join_path

import git.diff as git_diff

from git.util import to_bin_sha

from . import util

from .base import IndexObject, IndexObjUnion

from .blob import Blob

from .submodule.base import Submodule

from .fun import tree_entries_from_data, tree_to_stream

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

from typing import (

Any,

Callable,

Dict,

Iterable,

Iterator,

List,

Tuple,

Type,

Union,

cast,

TYPE_CHECKING,

)

from git.types import PathLike, Literal

if TYPE_CHECKING:

from git.repo import Repo

from io import BytesIO

TreeCacheTup = Tuple[bytes, int, str]

TraversedTreeTup = Union[Tuple[Union["Tree", None], IndexObjUnion, Tuple["Submodule", "Submodule"]]]

# def is_tree_cache(inp: Tuple[bytes, int, str]) -> TypeGuard[TreeCacheTup]:

# return isinstance(inp[0], bytes) and isinstance(inp[1], int) and isinstance([inp], str)

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

cmp: Callable[[str, str], int] = lambda a, b: (a > b) - (a < b)

__all__ = ("TreeModifier", "Tree")

def git_cmp(t1: TreeCacheTup, t2: TreeCacheTup) -> int:

a, b = t1[2], t2[2]

# assert isinstance(a, str) and isinstance(b, str)

len_a, len_b = len(a), len(b)

min_len = min(len_a, len_b)

min_cmp = cmp(a[:min_len], b[:min_len])

if min_cmp:

return min_cmp

return len_a - len_b

def merge_sort(a: List[TreeCacheTup], cmp: Callable[[TreeCacheTup, TreeCacheTup], int]) -> None:

if len(a) < 2:

return None

mid = len(a) // 2

lefthalf = a[:mid]

righthalf = a[mid:]

merge_sort(lefthalf, cmp)

merge_sort(righthalf, cmp)

i = 0

j = 0

k = 0

while i < len(lefthalf) and j < len(righthalf):

if cmp(lefthalf[i], righthalf[j]) <= 0:

a[k] = lefthalf[i]

i = i + 1

else:

a[k] = righthalf[j]

j = j + 1

k = k + 1

while i < len(lefthalf):

a[k] = lefthalf[i]

i = i + 1

k = k + 1

while j < len(righthalf):

a[k] = righthalf[j]

j = j + 1

k = k + 1

class TreeModifier(object):

"""A utility class providing methods to alter the underlying cache in a list-like fashion.

Once all adjustments are complete, the _cache, which really is a reference to

the cache of a tree, will be sorted. Assuring it will be in a serializable state"""

__slots__ = "_cache"

def __init__(self, cache: List[TreeCacheTup]) -> None:

self._cache = cache

def _index_by_name(self, name: str) -> int:

""":return: index of an item with name, or -1 if not found"""

for i, t in enumerate(self._cache):

if t[2] == name:

return i

# END found item

# END for each item in cache

return -1

# { Interface

def set_done(self) -> "TreeModifier":

"""Call this method once you are done modifying the tree information.

It may be called several times, but be aware that each call will cause

a sort operation

:return self:"""

merge_sort(self._cache, git_cmp)

return self

# } END interface

# { Mutators

def add(self, sha: bytes, mode: int, name: str, force: bool = False) -> "TreeModifier":

"""Add the given item to the tree. If an item with the given name already

exists, nothing will be done, but a ValueError will be raised if the

sha and mode of the existing item do not match the one you add, unless

force is True

:param sha: The 20 or 40 byte sha of the item to add

:param mode: int representing the stat compatible mode of the item

:param force: If True, an item with your name and information will overwrite

any existing item with the same name, no matter which information it has

:return: self"""

if "/" in name:

raise ValueError("Name must not contain '/' characters")

if (mode >> 12) not in Tree._map_id_to_type:

raise ValueError("Invalid object type according to mode %o" % mode)

sha = to_bin_sha(sha)

index = self._index_by_name(name)

item = (sha, mode, name)

# assert is_tree_cache(item)

if index == -1:

self._cache.append(item)

else:

if force:

self._cache[index] = item

else:

ex_item = self._cache[index]

if ex_item[0] != sha or ex_item[1] != mode:

raise ValueError("Item %r existed with different properties" % name)

# END handle mismatch

# END handle force

# END handle name exists

return self

def add_unchecked(self, binsha: bytes, mode: int, name: str) -> None:

"""Add the given item to the tree, its correctness is assumed, which

puts the caller into responsibility to assure the input is correct.

For more information on the parameters, see ``add``

:param binsha: 20 byte binary sha"""

assert isinstance(binsha, bytes) and isinstance(mode, int) and isinstance(name, str)

tree_cache = (binsha, mode, name)

self._cache.append(tree_cache)

def __delitem__(self, name: str) -> None:

"""Deletes an item with the given name if it exists"""

index = self._index_by_name(name)

if index > -1:

del self._cache[index]

# } END mutators

class Tree(IndexObject, git_diff.Diffable, util.Traversable, util.Serializable):

"""Tree objects represent an ordered list of Blobs and other Trees.

``Tree as a list``::

Access a specific blob using the

tree['filename'] notation.

You may as well access by index

blob = tree[0]

"""

type: Literal["tree"] = "tree"

__slots__ = "_cache"

# actual integer ids for comparison

commit_id = 0o16 # equals stat.S_IFDIR | stat.S_IFLNK - a directory link

blob_id = 0o10

symlink_id = 0o12

tree_id = 0o04

_map_id_to_type: Dict[int, Type[IndexObjUnion]] = {

commit_id: Submodule,

blob_id: Blob,

symlink_id: Blob

# tree id added once Tree is defined

}

def __init__(

self,

repo: "Repo",

binsha: bytes,

mode: int = tree_id << 12,

path: Union[PathLike, None] = None,

super(Tree, self).__init__(repo, binsha, mode, path)

@classmethod

def _get_intermediate_items(

cls,

index_object: IndexObjUnion,

) -> Union[Tuple["Tree", ...], Tuple[()]]:

if index_object.type == "tree":

return tuple(index_object._iter_convert_to_object(index_object._cache))

return ()

def _set_cache_(self, attr: str) -> None:

if attr == "_cache":

# Set the data when we need it

ostream = self.repo.odb.stream(self.binsha)

self._cache: List[TreeCacheTup] = tree_entries_from_data(ostream.read())

else:

super(Tree, self)._set_cache_(attr)

# END handle attribute

def _iter_convert_to_object(self, iterable: Iterable[TreeCacheTup]) -> Iterator[IndexObjUnion]:

"""Iterable yields tuples of (binsha, mode, name), which will be converted

to the respective object representation"""

for binsha, mode, name in iterable:

path = join_path(self.path, name)

try:

yield self._map_id_to_type[mode >> 12](self.repo, binsha, mode, path)

except KeyError as e:

raise TypeError("Unknown mode %o found in tree data for path '%s'" % (mode, path)) from e

# END for each item

def join(self, file: str) -> IndexObjUnion:

"""Find the named object in this tree's contents

:return: ``git.Blob`` or ``git.Tree`` or ``git.Submodule``

:raise KeyError: if given file or tree does not exist in tree"""

msg = "Blob or Tree named %r not found"

if "/" in file:

tree = self

item = self

tokens = file.split("/")

for i, token in enumerate(tokens):

item = tree[token]

if item.type == "tree":

tree = item

else:

# safety assertion - blobs are at the end of the path

if i != len(tokens) - 1:

raise KeyError(msg % file)

return item

# END handle item type

# END for each token of split path

if item == self:

raise KeyError(msg % file)

return item

else:

for info in self._cache:

if info[2] == file: # [2] == name

return self._map_id_to_type[info[1] >> 12](

self.repo, info[0], info[1], join_path(self.path, info[2])

)

# END for each obj

raise KeyError(msg % file)

# END handle long paths

def __truediv__(self, file: str) -> IndexObjUnion:

"""For PY3 only"""

return self.join(file)

@property

def trees(self) -> List["Tree"]:

""":return: list(Tree, ...) list of trees directly below this tree"""

return [i for i in self if i.type == "tree"]

@property

def blobs(self) -> List[Blob]:

""":return: list(Blob, ...) list of blobs directly below this tree"""

return [i for i in self if i.type == "blob"]

@property

def cache(self) -> TreeModifier:

"""

:return: An object allowing to modify the internal cache. This can be used

to change the tree's contents. When done, make sure you call ``set_done``

on the tree modifier, or serialization behaviour will be incorrect.

See the ``TreeModifier`` for more information on how to alter the cache"""

return TreeModifier(self._cache)

def traverse(

self, # type: ignore[override]

predicate: Callable[[Union[IndexObjUnion, TraversedTreeTup], int], bool] = lambda i, d: True,

prune: Callable[[Union[IndexObjUnion, TraversedTreeTup], int], bool] = lambda i, d: False,

depth: int = -1,

branch_first: bool = True,

visit_once: bool = False,

ignore_self: int = 1,

as_edge: bool = False,

) -> Union[Iterator[IndexObjUnion], Iterator[TraversedTreeTup]]:

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

Trees are set to visit_once = False to gain more performance in the traversal"""

# """

# # To typecheck instead of using cast.

# import itertools

# def is_tree_traversed(inp: Tuple) -> TypeGuard[Tuple[Iterator[Union['Tree', 'Blob', 'Submodule']]]]:

# return all(isinstance(x, (Blob, Tree, Submodule)) for x in inp[1])

# ret = super(Tree, self).traverse(predicate, prune, depth, branch_first, visit_once, ignore_self)

# ret_tup = itertools.tee(ret, 2)

# assert is_tree_traversed(ret_tup), f"Type is {[type(x) for x in list(ret_tup[0])]}"

# return ret_tup[0]"""

return cast(

Union[Iterator[IndexObjUnion], Iterator[TraversedTreeTup]],

super(Tree, self)._traverse(

predicate,

prune,

depth, # type: ignore

branch_first,

visit_once,

ignore_self,

)

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

"""

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

traverse()

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

"""

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

# List protocol

def __getslice__(self, i: int, j: int) -> List[IndexObjUnion]:

return list(self._iter_convert_to_object(self._cache[i:j]))

def __iter__(self) -> Iterator[IndexObjUnion]:

return self._iter_convert_to_object(self._cache)

def __len__(self) -> int:

return len(self._cache)

def __getitem__(self, item: Union[str, int, slice]) -> IndexObjUnion:

if isinstance(item, int):

info = self._cache[item]

return self._map_id_to_type[info[1] >> 12](self.repo, info[0], info[1], join_path(self.path, info[2]))

if isinstance(item, str):

# compatibility

return self.join(item)

# END index is basestring

raise TypeError("Invalid index type: %r" % item)

def __contains__(self, item: Union[IndexObjUnion, PathLike]) -> bool:

if isinstance(item, IndexObject):

for info in self._cache:

if item.binsha == info[0]:

return True

# END compare sha

# END for each entry

# END handle item is index object

# compatibility

# treat item as repo-relative path

else:

path = self.path

for info in self._cache:

if item == join_path(path, info[2]):

return True

# END for each item

return False

def __reversed__(self) -> Iterator[IndexObjUnion]:

return reversed(self._iter_convert_to_object(self._cache)) # type: ignore

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

"""Serialize this tree into the stream. Please note that we will assume

our tree data to be in a sorted state. If this is not the case, serialization

will not generate a correct tree representation as these are assumed to be sorted

by algorithms"""

tree_to_stream(self._cache, stream.write)

return self

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

self._cache = tree_entries_from_data(stream.read())

return self

# END tree

# finalize map definition

Tree._map_id_to_type[Tree.tree_id] = Tree

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

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