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342 lines
11 KiB
342 lines
11 KiB
# tree.py
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# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
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#
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# This module is part of GitPython and is released under
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# the BSD License: http://www.opensource.org/licenses/bsd-license.php
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from git.util import join_path
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import git.diff as diff
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from git.util import to_bin_sha
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from . import util
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from .base import IndexObject
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from .blob import Blob
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from .submodule.base import Submodule
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from git.compat import string_types
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from .fun import (
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tree_entries_from_data,
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tree_to_stream
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)
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from git.compat import PY3
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if PY3:
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cmp = lambda a, b: (a > b) - (a < b)
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__all__ = ("TreeModifier", "Tree")
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def git_cmp(t1, t2):
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a, b = t1[2], t2[2]
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len_a, len_b = len(a), len(b)
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min_len = min(len_a, len_b)
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min_cmp = cmp(a[:min_len], b[:min_len])
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if min_cmp:
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return min_cmp
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return len_a - len_b
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def merge_sort(a, cmp):
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if len(a) < 2:
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return
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mid = len(a) // 2
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lefthalf = a[:mid]
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righthalf = a[mid:]
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merge_sort(lefthalf, cmp)
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merge_sort(righthalf, cmp)
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i = 0
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j = 0
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k = 0
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while i < len(lefthalf) and j < len(righthalf):
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if cmp(lefthalf[i], righthalf[j]) <= 0:
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a[k] = lefthalf[i]
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i = i + 1
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else:
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a[k] = righthalf[j]
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j = j + 1
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k = k + 1
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while i < len(lefthalf):
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a[k] = lefthalf[i]
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i = i + 1
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k = k + 1
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while j < len(righthalf):
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a[k] = righthalf[j]
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j = j + 1
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k = k + 1
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class TreeModifier(object):
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"""A utility class providing methods to alter the underlying cache in a list-like fashion.
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Once all adjustments are complete, the _cache, which really is a reference to
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the cache of a tree, will be sorted. Assuring it will be in a serializable state"""
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__slots__ = '_cache'
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def __init__(self, cache):
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self._cache = cache
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def _index_by_name(self, name):
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""":return: index of an item with name, or -1 if not found"""
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for i, t in enumerate(self._cache):
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if t[2] == name:
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return i
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# END found item
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# END for each item in cache
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return -1
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#{ Interface
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def set_done(self):
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"""Call this method once you are done modifying the tree information.
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It may be called several times, but be aware that each call will cause
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a sort operation
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:return self:"""
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merge_sort(self._cache, git_cmp)
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return self
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#} END interface
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#{ Mutators
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def add(self, sha, mode, name, force=False):
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"""Add the given item to the tree. If an item with the given name already
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exists, nothing will be done, but a ValueError will be raised if the
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sha and mode of the existing item do not match the one you add, unless
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force is True
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:param sha: The 20 or 40 byte sha of the item to add
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:param mode: int representing the stat compatible mode of the item
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:param force: If True, an item with your name and information will overwrite
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any existing item with the same name, no matter which information it has
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:return: self"""
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if '/' in name:
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raise ValueError("Name must not contain '/' characters")
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if (mode >> 12) not in Tree._map_id_to_type:
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raise ValueError("Invalid object type according to mode %o" % mode)
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sha = to_bin_sha(sha)
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index = self._index_by_name(name)
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item = (sha, mode, name)
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if index == -1:
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self._cache.append(item)
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else:
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if force:
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self._cache[index] = item
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else:
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ex_item = self._cache[index]
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if ex_item[0] != sha or ex_item[1] != mode:
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raise ValueError("Item %r existed with different properties" % name)
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# END handle mismatch
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# END handle force
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# END handle name exists
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return self
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def add_unchecked(self, binsha, mode, name):
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"""Add the given item to the tree, its correctness is assumed, which
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puts the caller into responsibility to assure the input is correct.
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For more information on the parameters, see ``add``
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:param binsha: 20 byte binary sha"""
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self._cache.append((binsha, mode, name))
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def __delitem__(self, name):
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"""Deletes an item with the given name if it exists"""
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index = self._index_by_name(name)
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if index > -1:
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del(self._cache[index])
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#} END mutators
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class Tree(IndexObject, diff.Diffable, util.Traversable, util.Serializable):
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"""Tree objects represent an ordered list of Blobs and other Trees.
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``Tree as a list``::
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Access a specific blob using the
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tree['filename'] notation.
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You may as well access by index
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blob = tree[0]
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"""
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type = "tree"
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__slots__ = "_cache"
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# actual integer ids for comparison
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commit_id = 0o16 # equals stat.S_IFDIR | stat.S_IFLNK - a directory link
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blob_id = 0o10
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symlink_id = 0o12
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tree_id = 0o04
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_map_id_to_type = {
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commit_id: Submodule,
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blob_id: Blob,
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symlink_id: Blob
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# tree id added once Tree is defined
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}
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def __init__(self, repo, binsha, mode=tree_id << 12, path=None):
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super(Tree, self).__init__(repo, binsha, mode, path)
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@classmethod
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def _get_intermediate_items(cls, index_object):
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if index_object.type == "tree":
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return tuple(index_object._iter_convert_to_object(index_object._cache))
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return ()
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def _set_cache_(self, attr):
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if attr == "_cache":
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# Set the data when we need it
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ostream = self.repo.odb.stream(self.binsha)
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self._cache = tree_entries_from_data(ostream.read())
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else:
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super(Tree, self)._set_cache_(attr)
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# END handle attribute
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def _iter_convert_to_object(self, iterable):
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"""Iterable yields tuples of (binsha, mode, name), which will be converted
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to the respective object representation"""
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for binsha, mode, name in iterable:
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path = join_path(self.path, name)
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try:
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yield self._map_id_to_type[mode >> 12](self.repo, binsha, mode, path)
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except KeyError:
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raise TypeError("Unknown mode %o found in tree data for path '%s'" % (mode, path))
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# END for each item
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def join(self, file):
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"""Find the named object in this tree's contents
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:return: ``git.Blob`` or ``git.Tree`` or ``git.Submodule``
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:raise KeyError: if given file or tree does not exist in tree"""
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msg = "Blob or Tree named %r not found"
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if '/' in file:
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tree = self
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item = self
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tokens = file.split('/')
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for i, token in enumerate(tokens):
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item = tree[token]
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if item.type == 'tree':
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tree = item
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else:
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# safety assertion - blobs are at the end of the path
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if i != len(tokens) - 1:
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raise KeyError(msg % file)
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return item
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# END handle item type
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# END for each token of split path
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if item == self:
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raise KeyError(msg % file)
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return item
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else:
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for info in self._cache:
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if info[2] == file: # [2] == name
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return self._map_id_to_type[info[1] >> 12](self.repo, info[0], info[1],
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join_path(self.path, info[2]))
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# END for each obj
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raise KeyError(msg % file)
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# END handle long paths
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def __div__(self, file):
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"""For PY2 only"""
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return self.join(file)
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def __truediv__(self, file):
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"""For PY3 only"""
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return self.join(file)
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@property
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def trees(self):
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""":return: list(Tree, ...) list of trees directly below this tree"""
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return [i for i in self if i.type == "tree"]
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@property
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def blobs(self):
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""":return: list(Blob, ...) list of blobs directly below this tree"""
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return [i for i in self if i.type == "blob"]
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@property
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def cache(self):
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"""
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:return: An object allowing to modify the internal cache. This can be used
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to change the tree's contents. When done, make sure you call ``set_done``
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on the tree modifier, or serialization behaviour will be incorrect.
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See the ``TreeModifier`` for more information on how to alter the cache"""
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return TreeModifier(self._cache)
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def traverse(self, predicate=lambda i, d: True,
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prune=lambda i, d: False, depth=-1, branch_first=True,
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visit_once=False, ignore_self=1):
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"""For documentation, see util.Traversable.traverse
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Trees are set to visit_once = False to gain more performance in the traversal"""
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return super(Tree, self).traverse(predicate, prune, depth, branch_first, visit_once, ignore_self)
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# List protocol
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def __getslice__(self, i, j):
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return list(self._iter_convert_to_object(self._cache[i:j]))
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def __iter__(self):
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return self._iter_convert_to_object(self._cache)
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def __len__(self):
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return len(self._cache)
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def __getitem__(self, item):
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if isinstance(item, int):
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info = self._cache[item]
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return self._map_id_to_type[info[1] >> 12](self.repo, info[0], info[1], join_path(self.path, info[2]))
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if isinstance(item, string_types):
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# compatibility
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return self.join(item)
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# END index is basestring
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raise TypeError("Invalid index type: %r" % item)
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def __contains__(self, item):
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if isinstance(item, IndexObject):
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for info in self._cache:
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if item.binsha == info[0]:
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return True
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# END compare sha
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# END for each entry
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# END handle item is index object
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# compatibility
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# treat item as repo-relative path
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path = self.path
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for info in self._cache:
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if item == join_path(path, info[2]):
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return True
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# END for each item
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return False
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def __reversed__(self):
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return reversed(self._iter_convert_to_object(self._cache))
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def _serialize(self, stream):
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"""Serialize this tree into the stream. Please note that we will assume
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our tree data to be in a sorted state. If this is not the case, serialization
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will not generate a correct tree representation as these are assumed to be sorted
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by algorithms"""
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tree_to_stream(self._cache, stream.write)
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return self
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def _deserialize(self, stream):
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self._cache = tree_entries_from_data(stream.read())
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return self
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# END tree
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# finalize map definition
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Tree._map_id_to_type[Tree.tree_id] = Tree
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#
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