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# tree.py
# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# 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 join_path
import git.diff as diff
from git.util import to_bin_sha
from . import util
from .base import IndexObject
from .blob import Blob
from .submodule.base import Submodule
from .fun import (
tree_entries_from_data,
tree_to_stream
)
cmp = lambda a, b: (a > b) - (a < b)
__all__ = ("TreeModifier", "Tree")
def git_cmp(t1, t2):
a, b = t1[2], t2[2]
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, cmp):
if len(a) < 2:
return
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):
self._cache = cache
def _index_by_name(self, name):
""":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):
"""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, mode, name, force=False):
"""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)
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, mode, name):
"""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"""
self._cache.append((binsha, mode, name))
def __delitem__(self, name):
"""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, 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 = "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 = {
commit_id: Submodule,
blob_id: Blob,
symlink_id: Blob
# tree id added once Tree is defined
}
def __init__(self, repo, binsha, mode=tree_id << 12, path=None):
super(Tree, self).__init__(repo, binsha, mode, path)
@classmethod
def _get_intermediate_items(cls, index_object):
if index_object.type == "tree":
return tuple(index_object._iter_convert_to_object(index_object._cache))
return ()
def _set_cache_(self, attr):
if attr == "_cache":
# Set the data when we need it
ostream = self.repo.odb.stream(self.binsha)
self._cache = tree_entries_from_data(ostream.read())
else:
super(Tree, self)._set_cache_(attr)
# END handle attribute
def _iter_convert_to_object(self, iterable):
"""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):
"""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 __div__(self, file):
"""For PY2 only"""
return self.join(file)
def __truediv__(self, file):
"""For PY3 only"""
return self.join(file)
@property
def trees(self):
""":return: list(Tree, ...) list of trees directly below this tree"""
return [i for i in self if i.type == "tree"]
@property
def blobs(self):
""":return: list(Blob, ...) list of blobs directly below this tree"""
return [i for i in self if i.type == "blob"]
@property
def cache(self):
"""
: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, predicate=lambda i, d: True,
prune=lambda i, d: False, depth=-1, branch_first=True,
visit_once=False, ignore_self=1):
"""For documentation, see util.Traversable.traverse
Trees are set to visit_once = False to gain more performance in the traversal"""
return super(Tree, self).traverse(predicate, prune, depth, branch_first, visit_once, ignore_self)
# List protocol
def __getslice__(self, i, j):
return list(self._iter_convert_to_object(self._cache[i:j]))
def __iter__(self):
return self._iter_convert_to_object(self._cache)
def __len__(self):
return len(self._cache)
def __getitem__(self, item):
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):
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
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):
return reversed(self._iter_convert_to_object(self._cache))
def _serialize(self, stream):
"""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):
self._cache = tree_entries_from_data(stream.read())
return self
# END tree
# finalize map definition
Tree._map_id_to_type[Tree.tree_id] = Tree
#
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