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tree.py
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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
fromgit.utilimportjoin_path
importgit.diffasdiff
fromgit.utilimportto_bin_sha
from .importutil
from .baseimportIndexObject
from .blobimportBlob
from .submodule.baseimportSubmodule
fromgit.compatimportstring_types
from .funimport (
tree_entries_from_data,
tree_to_stream
)
fromgit.compatimportPY3
ifPY3:
cmp=lambdaa,b: (a>b)- (a<b)
__all__= ("TreeModifier","Tree")
defgit_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])
ifmin_cmp:
returnmin_cmp
returnlen_a-len_b
defmerge_sort(a,cmp):
iflen(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
whilei<len(lefthalf)andj<len(righthalf):
ifcmp(lefthalf[i],righthalf[j])<=0:
a[k]=lefthalf[i]
i=i+1
else:
a[k]=righthalf[j]
j=j+1
k=k+1
whilei<len(lefthalf):
a[k]=lefthalf[i]
i=i+1
k=k+1
whilej<len(righthalf):
a[k]=righthalf[j]
j=j+1
k=k+1
classTreeModifier(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"""
fori,tinenumerate(self._cache):
ift[2]==name:
returni
# END found item
# END for each item in cache
return-1
#{ Interface
defset_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)
returnself
#} END interface
#{ Mutators
defadd(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'/'inname:
raiseValueError("Name must not contain '/' characters")
if (mode>>12)notinTree._map_id_to_type:
raiseValueError("Invalid object type according to mode %o"%mode)
sha=to_bin_sha(sha)
index=self._index_by_name(name)
item= (sha,mode,name)
ifindex==-1:
self._cache.append(item)
else:
ifforce:
self._cache[index]=item
else:
ex_item=self._cache[index]
ifex_item[0]!=shaorex_item[1]!=mode:
raiseValueError("Item %r existed with different properties"%name)
# END handle mismatch
# END handle force
# END handle name exists
returnself
defadd_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)
ifindex>-1:
del(self._cache[index])
#} END mutators
classTree(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):
ifindex_object.type=="tree":
returntuple(index_object._iter_convert_to_object(index_object._cache))
returntuple()
def_set_cache_(self,attr):
ifattr=="_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"""
forbinsha,mode,nameiniterable:
path=join_path(self.path,name)
try:
yieldself._map_id_to_type[mode>>12](self.repo,binsha,mode,path)
exceptKeyError:
raiseTypeError("Unknown mode %o found in tree data for path '%s'"% (mode,path))
# END for each item
defjoin(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'/'infile:
tree=self
item=self
tokens=file.split('/')
fori,tokeninenumerate(tokens):
item=tree[token]
ifitem.type=='tree':
tree=item
else:
# safety assertion - blobs are at the end of the path
ifi!=len(tokens)-1:
raiseKeyError(msg%file)
returnitem
# END handle item type
# END for each token of split path
ifitem==self:
raiseKeyError(msg%file)
returnitem
else:
forinfoinself._cache:
ifinfo[2]==file:# [2] == name
returnself._map_id_to_type[info[1]>>12](self.repo,info[0],info[1],
join_path(self.path,info[2]))
# END for each obj
raiseKeyError(msg%file)
# END handle long paths
def__div__(self,file):
"""For PY2 only"""
returnself.join(file)
def__truediv__(self,file):
"""For PY3 only"""
returnself.join(file)
@property
deftrees(self):
""":return: list(Tree, ...) list of trees directly below this tree"""
return [iforiinselfifi.type=="tree"]
@property
defblobs(self):
""":return: list(Blob, ...) list of blobs directly below this tree"""
return [iforiinselfifi.type=="blob"]
@property
defcache(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"""
returnTreeModifier(self._cache)
deftraverse(self,predicate=lambdai,d:True,
prune=lambdai,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"""
returnsuper(Tree,self).traverse(predicate,prune,depth,branch_first,visit_once,ignore_self)
# List protocol
def__getslice__(self,i,j):
returnlist(self._iter_convert_to_object(self._cache[i:j]))
def__iter__(self):
returnself._iter_convert_to_object(self._cache)
def__len__(self):
returnlen(self._cache)
def__getitem__(self,item):
ifisinstance(item,int):
info=self._cache[item]
returnself._map_id_to_type[info[1]>>12](self.repo,info[0],info[1],join_path(self.path,info[2]))
ifisinstance(item,string_types):
# compatibility
returnself.join(item)
# END index is basestring
raiseTypeError("Invalid index type: %r"%item)
def__contains__(self,item):
ifisinstance(item,IndexObject):
forinfoinself._cache:
ifitem.binsha==info[0]:
returnTrue
# END compare sha
# END for each entry
# END handle item is index object
# compatibility
# treat item as repo-relative path
path=self.path
forinfoinself._cache:
ifitem==join_path(path,info[2]):
returnTrue
# END for each item
returnFalse
def__reversed__(self):
returnreversed(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)
returnself
def_deserialize(self,stream):
self._cache=tree_entries_from_data(stream.read())
returnself
# END tree
# finalize map definition
Tree._map_id_to_type[Tree.tree_id]=Tree
#