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# Copyright (C) 2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Content-filtered view of any tree.
"""
from __future__ import absolute_import
from bzrlib import (
tree,
)
from bzrlib.filters import (
ContentFilterContext,
filtered_output_bytes,
)
class ContentFilterTree(tree.Tree):
"""A virtual tree that applies content filters to an underlying tree.
Not every operation is supported yet.
"""
def __init__(self, backing_tree, filter_stack_callback):
"""Construct a new filtered tree view.
:param filter_stack_callback: A callable taking a path that returns
the filter stack that should be used for that path.
:param backing_tree: An underlying tree to wrap.
"""
self.backing_tree = backing_tree
self.filter_stack_callback = filter_stack_callback
def get_file_text(self, file_id, path=None):
chunks = self.backing_tree.get_file_lines(file_id, path)
filters = self.filter_stack_callback(path)
if path is None:
path = self.backing_tree.id2path(file_id)
context = ContentFilterContext(path, self, None)
contents = filtered_output_bytes(chunks, filters, context)
content = ''.join(contents)
return content
def has_filename(self, filename):
return self.backing_tree.has_filename
def is_executable(self, file_id, path=None):
return self.backing_tree.is_executable(file_id, path)
def iter_entries_by_dir(self, specific_file_ids=None, yield_parents=None):
# NB: This simply returns the parent tree's entries; the length may be
# wrong but it can't easily be calculated without filtering the whole
# text. Currently all callers cope with this; perhaps they should be
# updated to a narrower interface that only provides things guaranteed
# cheaply available across all trees. -- mbp 20110705
return self.backing_tree.iter_entries_by_dir(
specific_file_ids=specific_file_ids,
yield_parents=yield_parents)
def lock_read(self):
return self.backing_tree.lock_read()
def unlock(self):
return self.backing_tree.unlock()
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