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# -*- coding: utf-8 -*-
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"""
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rhodecode.lib.diffs
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~~~~~~~~~~~~~~~~~~~
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Set of diffing helpers, previously part of vcs
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:created_on: Dec 4, 2011
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:author: marcink
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:copyright: (C) 2010-2012 Marcin Kuzminski <marcin@python-works.com>
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:original copyright: 2007-2008 by Armin Ronacher
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:license: GPLv3, see COPYING for more details.
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"""
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import re
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import difflib
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import logging
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from itertools import tee, imap
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from pylons.i18n.translation import _
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from rhodecode.lib.vcs.exceptions import VCSError
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from rhodecode.lib.vcs.nodes import FileNode, SubModuleNode
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from rhodecode.lib.vcs.backends.base import EmptyChangeset
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from rhodecode.lib.helpers import escape
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from rhodecode.lib.utils2 import safe_unicode, safe_str
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log = logging.getLogger(__name__)
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def wrap_to_table(str_):
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return '''<table class="code-difftable">
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<tr class="line no-comment">
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<td class="lineno new"></td>
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<td class="code no-comment"><pre>%s</pre></td>
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</tr>
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</table>''' % str_
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def wrapped_diff(filenode_old, filenode_new, cut_off_limit=None,
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ignore_whitespace=True, line_context=3,
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enable_comments=False):
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"""
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returns a wrapped diff into a table, checks for cut_off_limit and presents
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proper message
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"""
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if filenode_old is None:
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filenode_old = FileNode(filenode_new.path, '', EmptyChangeset())
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if filenode_old.is_binary or filenode_new.is_binary:
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diff = wrap_to_table(_('Binary file'))
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stats = (0, 0)
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size = 0
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elif cut_off_limit != -1 and (cut_off_limit is None or
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(filenode_old.size < cut_off_limit and filenode_new.size < cut_off_limit)):
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f_gitdiff = get_gitdiff(filenode_old, filenode_new,
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ignore_whitespace=ignore_whitespace,
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context=line_context)
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diff_processor = DiffProcessor(f_gitdiff, format='gitdiff')
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diff = diff_processor.as_html(enable_comments=enable_comments)
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stats = diff_processor.stat()
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size = len(diff or '')
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else:
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diff = wrap_to_table(_('Changeset was too big and was cut off, use '
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'diff menu to display this diff'))
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stats = (0, 0)
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size = 0
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if not diff:
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submodules = filter(lambda o: isinstance(o, SubModuleNode),
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[filenode_new, filenode_old])
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if submodules:
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diff = wrap_to_table(escape('Submodule %r' % submodules[0]))
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else:
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diff = wrap_to_table(_('No changes detected'))
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cs1 = filenode_old.changeset.raw_id
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cs2 = filenode_new.changeset.raw_id
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return size, cs1, cs2, diff, stats
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def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True, context=3):
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"""
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Returns git style diff between given ``filenode_old`` and ``filenode_new``.
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:param ignore_whitespace: ignore whitespaces in diff
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"""
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# make sure we pass in default context
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context = context or 3
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submodules = filter(lambda o: isinstance(o, SubModuleNode),
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[filenode_new, filenode_old])
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if submodules:
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return ''
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for filenode in (filenode_old, filenode_new):
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if not isinstance(filenode, FileNode):
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raise VCSError("Given object should be FileNode object, not %s"
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% filenode.__class__)
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repo = filenode_new.changeset.repository
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old_raw_id = getattr(filenode_old.changeset, 'raw_id', repo.EMPTY_CHANGESET)
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new_raw_id = getattr(filenode_new.changeset, 'raw_id', repo.EMPTY_CHANGESET)
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vcs_gitdiff = repo.get_diff(old_raw_id, new_raw_id, filenode_new.path,
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ignore_whitespace, context)
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return vcs_gitdiff
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NEW_FILENODE = 1
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DEL_FILENODE = 2
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MOD_FILENODE = 3
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RENAMED_FILENODE = 4
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CHMOD_FILENODE = 5
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class DiffLimitExceeded(Exception):
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pass
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class LimitedDiffContainer(object):
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def __init__(self, diff_limit, cur_diff_size, diff):
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self.diff = diff
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self.diff_limit = diff_limit
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self.cur_diff_size = cur_diff_size
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def __iter__(self):
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for l in self.diff:
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yield l
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class DiffProcessor(object):
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"""
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Give it a unified or git diff and it returns a list of the files that were
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mentioned in the diff together with a dict of meta information that
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can be used to render it in a HTML template.
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"""
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_chunk_re = re.compile(r'^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
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_newline_marker = re.compile(r'^\\ No newline at end of file')
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_git_header_re = re.compile(r"""
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#^diff[ ]--git
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[ ]a/(?P<a_path>.+?)[ ]b/(?P<b_path>.+?)\n
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(?:^similarity[ ]index[ ](?P<similarity_index>\d+)%\n
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^rename[ ]from[ ](?P<rename_from>\S+)\n
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^rename[ ]to[ ](?P<rename_to>\S+)(?:\n|$))?
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(?:^old[ ]mode[ ](?P<old_mode>\d+)\n
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^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
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(?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
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(?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
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(?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
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\.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
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(?:^---[ ](a/(?P<a_file>.+)|/dev/null)(?:\n|$))?
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(?:^\+\+\+[ ](b/(?P<b_file>.+)|/dev/null)(?:\n|$))?
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""", re.VERBOSE | re.MULTILINE)
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_hg_header_re = re.compile(r"""
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#^diff[ ]--git
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[ ]a/(?P<a_path>.+?)[ ]b/(?P<b_path>.+?)\n
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(?:^similarity[ ]index[ ](?P<similarity_index>\d+)%(?:\n|$))?
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(?:^rename[ ]from[ ](?P<rename_from>\S+)\n
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^rename[ ]to[ ](?P<rename_to>\S+)(?:\n|$))?
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(?:^old[ ]mode[ ](?P<old_mode>\d+)\n
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^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
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(?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
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(?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
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(?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
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\.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
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(?:^---[ ](a/(?P<a_file>.+)|/dev/null)(?:\n|$))?
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(?:^\+\+\+[ ](b/(?P<b_file>.+)|/dev/null)(?:\n|$))?
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""", re.VERBOSE | re.MULTILINE)
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#used for inline highlighter word split
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_token_re = re.compile(r'()(>|<|&|\W+?)')
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def __init__(self, diff, vcs='hg', format='gitdiff', diff_limit=None):
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"""
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:param diff: a text in diff format
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:param vcs: type of version controll hg or git
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:param format: format of diff passed, `udiff` or `gitdiff`
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:param diff_limit: define the size of diff that is considered "big"
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based on that parameter cut off will be triggered, set to None
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to show full diff
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"""
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if not isinstance(diff, basestring):
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raise Exception('Diff must be a basestring got %s instead' % type(diff))
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self._diff = diff
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self._format = format
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self.adds = 0
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self.removes = 0
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# calculate diff size
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self.diff_size = len(diff)
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self.diff_limit = diff_limit
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self.cur_diff_size = 0
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self.parsed = False
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self.parsed_diff = []
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self.vcs = vcs
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if format == 'gitdiff':
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self.differ = self._highlight_line_difflib
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self._parser = self._parse_gitdiff
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else:
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self.differ = self._highlight_line_udiff
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self._parser = self._parse_udiff
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def _copy_iterator(self):
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"""
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make a fresh copy of generator, we should not iterate thru
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an original as it's needed for repeating operations on
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this instance of DiffProcessor
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"""
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self.__udiff, iterator_copy = tee(self.__udiff)
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return iterator_copy
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def _escaper(self, string):
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"""
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Escaper for diff escapes special chars and checks the diff limit
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:param string:
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:type string:
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"""
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self.cur_diff_size += len(string)
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# escaper get's iterated on each .next() call and it checks if each
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# parsed line doesn't exceed the diff limit
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if self.diff_limit is not None and self.cur_diff_size > self.diff_limit:
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raise DiffLimitExceeded('Diff Limit Exceeded')
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return safe_unicode(string).replace('&', '&')\
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.replace('<', '<')\
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.replace('>', '>')
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def _line_counter(self, l):
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"""
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Checks each line and bumps total adds/removes for this diff
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:param l:
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"""
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if l.startswith('+') and not l.startswith('+++'):
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self.adds += 1
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elif l.startswith('-') and not l.startswith('---'):
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self.removes += 1
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return safe_unicode(l)
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def _highlight_line_difflib(self, line, next_):
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"""
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Highlight inline changes in both lines.
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"""
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if line['action'] == 'del':
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old, new = line, next_
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else:
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old, new = next_, line
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oldwords = self._token_re.split(old['line'])
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newwords = self._token_re.split(new['line'])
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sequence = difflib.SequenceMatcher(None, oldwords, newwords)
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oldfragments, newfragments = [], []
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for tag, i1, i2, j1, j2 in sequence.get_opcodes():
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oldfrag = ''.join(oldwords[i1:i2])
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newfrag = ''.join(newwords[j1:j2])
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if tag != 'equal':
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if oldfrag:
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oldfrag = '<del>%s</del>' % oldfrag
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if newfrag:
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newfrag = '<ins>%s</ins>' % newfrag
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oldfragments.append(oldfrag)
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newfragments.append(newfrag)
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old['line'] = "".join(oldfragments)
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new['line'] = "".join(newfragments)
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def _highlight_line_udiff(self, line, next_):
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"""
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Highlight inline changes in both lines.
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"""
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start = 0
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limit = min(len(line['line']), len(next_['line']))
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while start < limit and line['line'][start] == next_['line'][start]:
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start += 1
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end = -1
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limit -= start
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while -end <= limit and line['line'][end] == next_['line'][end]:
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end -= 1
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end += 1
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if start or end:
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def do(l):
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last = end + len(l['line'])
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if l['action'] == 'add':
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tag = 'ins'
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else:
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tag = 'del'
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l['line'] = '%s<%s>%s</%s>%s' % (
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l['line'][:start],
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tag,
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l['line'][start:last],
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tag,
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l['line'][last:]
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)
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do(line)
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do(next_)
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def _get_header(self, diff_chunk):
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"""
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parses the diff header, and returns parts, and leftover diff
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parts consists of 14 elements::
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a_path, b_path, similarity_index, rename_from, rename_to,
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old_mode, new_mode, new_file_mode, deleted_file_mode,
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a_blob_id, b_blob_id, b_mode, a_file, b_file
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:param diff_chunk:
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:type diff_chunk:
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"""
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if self.vcs == 'git':
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match = self._git_header_re.match(diff_chunk)
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diff = diff_chunk[match.end():]
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return match.groupdict(), imap(self._escaper, diff.splitlines(1))
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elif self.vcs == 'hg':
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match = self._hg_header_re.match(diff_chunk)
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diff = diff_chunk[match.end():]
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return match.groupdict(), imap(self._escaper, diff.splitlines(1))
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else:
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raise Exception('VCS type %s is not supported' % self.vcs)
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def _clean_line(self, line, command):
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if command in ['+', '-', ' ']:
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#only modify the line if it's actually a diff thing
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line = line[1:]
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return line
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def _parse_gitdiff(self, inline_diff=True):
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_files = []
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diff_container = lambda arg: arg
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##split the diff in chunks of separate --git a/file b/file chunks
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for raw_diff in ('\n' + self._diff).split('\ndiff --git')[1:]:
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binary = False
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binary_msg = 'unknown binary'
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head, diff = self._get_header(raw_diff)
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if not head['a_file'] and head['b_file']:
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op = 'A'
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elif head['a_file'] and head['b_file']:
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op = 'M'
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elif head['a_file'] and not head['b_file']:
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op = 'D'
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else:
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#probably we're dealing with a binary file 1
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binary = True
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if head['deleted_file_mode']:
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op = 'D'
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stats = ['b', DEL_FILENODE]
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binary_msg = 'deleted binary file'
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elif head['new_file_mode']:
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op = 'A'
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stats = ['b', NEW_FILENODE]
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binary_msg = 'new binary file %s' % head['new_file_mode']
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else:
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if head['new_mode'] and head['old_mode']:
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stats = ['b', CHMOD_FILENODE]
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op = 'M'
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binary_msg = ('modified binary file chmod %s => %s'
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% (head['old_mode'], head['new_mode']))
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elif (head['rename_from'] and head['rename_to']
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and head['rename_from'] != head['rename_to']):
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stats = ['b', RENAMED_FILENODE]
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op = 'M'
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binary_msg = ('file renamed from %s to %s'
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% (head['rename_from'], head['rename_to']))
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else:
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stats = ['b', MOD_FILENODE]
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op = 'M'
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binary_msg = 'modified binary file'
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if not binary:
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try:
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chunks, stats = self._parse_lines(diff)
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except DiffLimitExceeded:
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diff_container = lambda _diff: LimitedDiffContainer(
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self.diff_limit,
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self.cur_diff_size,
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_diff)
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break
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else:
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chunks = []
|
|
|
chunks.append([{
|
|
|
'old_lineno': '',
|
|
|
'new_lineno': '',
|
|
|
'action': 'binary',
|
|
|
'line': binary_msg,
|
|
|
}])
|
|
|
|
|
|
_files.append({
|
|
|
'filename': head['b_path'],
|
|
|
'old_revision': head['a_blob_id'],
|
|
|
'new_revision': head['b_blob_id'],
|
|
|
'chunks': chunks,
|
|
|
'operation': op,
|
|
|
'stats': stats,
|
|
|
})
|
|
|
|
|
|
sorter = lambda info: {'A': 0, 'M': 1, 'D': 2}.get(info['operation'])
|
|
|
|
|
|
if not inline_diff:
|
|
|
return diff_container(sorted(_files, key=sorter))
|
|
|
|
|
|
# highlight inline changes
|
|
|
for diff_data in _files:
|
|
|
for chunk in diff_data['chunks']:
|
|
|
lineiter = iter(chunk)
|
|
|
try:
|
|
|
while 1:
|
|
|
line = lineiter.next()
|
|
|
if line['action'] not in ['unmod', 'context']:
|
|
|
nextline = lineiter.next()
|
|
|
if nextline['action'] in ['unmod', 'context'] or \
|
|
|
nextline['action'] == line['action']:
|
|
|
continue
|
|
|
self.differ(line, nextline)
|
|
|
except StopIteration:
|
|
|
pass
|
|
|
|
|
|
return diff_container(sorted(_files, key=sorter))
|
|
|
|
|
|
def _parse_udiff(self, inline_diff=True):
|
|
|
raise NotImplementedError()
|
|
|
|
|
|
def _parse_lines(self, diff):
|
|
|
"""
|
|
|
Parse the diff an return data for the template.
|
|
|
"""
|
|
|
|
|
|
lineiter = iter(diff)
|
|
|
stats = [0, 0]
|
|
|
|
|
|
try:
|
|
|
chunks = []
|
|
|
line = lineiter.next()
|
|
|
|
|
|
while line:
|
|
|
lines = []
|
|
|
chunks.append(lines)
|
|
|
|
|
|
match = self._chunk_re.match(line)
|
|
|
|
|
|
if not match:
|
|
|
break
|
|
|
|
|
|
gr = match.groups()
|
|
|
(old_line, old_end,
|
|
|
new_line, new_end) = [int(x or 1) for x in gr[:-1]]
|
|
|
old_line -= 1
|
|
|
new_line -= 1
|
|
|
|
|
|
context = len(gr) == 5
|
|
|
old_end += old_line
|
|
|
new_end += new_line
|
|
|
|
|
|
if context:
|
|
|
# skip context only if it's first line
|
|
|
if int(gr[0]) > 1:
|
|
|
lines.append({
|
|
|
'old_lineno': '...',
|
|
|
'new_lineno': '...',
|
|
|
'action': 'context',
|
|
|
'line': line,
|
|
|
})
|
|
|
|
|
|
line = lineiter.next()
|
|
|
|
|
|
while old_line < old_end or new_line < new_end:
|
|
|
command = ' '
|
|
|
if line:
|
|
|
command = line[0]
|
|
|
|
|
|
affects_old = affects_new = False
|
|
|
|
|
|
# ignore those if we don't expect them
|
|
|
if command in '#@':
|
|
|
continue
|
|
|
elif command == '+':
|
|
|
affects_new = True
|
|
|
action = 'add'
|
|
|
stats[0] += 1
|
|
|
elif command == '-':
|
|
|
affects_old = True
|
|
|
action = 'del'
|
|
|
stats[1] += 1
|
|
|
else:
|
|
|
affects_old = affects_new = True
|
|
|
action = 'unmod'
|
|
|
|
|
|
if not self._newline_marker.match(line):
|
|
|
old_line += affects_old
|
|
|
new_line += affects_new
|
|
|
lines.append({
|
|
|
'old_lineno': affects_old and old_line or '',
|
|
|
'new_lineno': affects_new and new_line or '',
|
|
|
'action': action,
|
|
|
'line': self._clean_line(line, command)
|
|
|
})
|
|
|
|
|
|
line = lineiter.next()
|
|
|
|
|
|
if self._newline_marker.match(line):
|
|
|
# we need to append to lines, since this is not
|
|
|
# counted in the line specs of diff
|
|
|
lines.append({
|
|
|
'old_lineno': '...',
|
|
|
'new_lineno': '...',
|
|
|
'action': 'context',
|
|
|
'line': self._clean_line(line, command)
|
|
|
})
|
|
|
|
|
|
except StopIteration:
|
|
|
pass
|
|
|
return chunks, stats
|
|
|
|
|
|
def _safe_id(self, idstring):
|
|
|
"""Make a string safe for including in an id attribute.
|
|
|
|
|
|
The HTML spec says that id attributes 'must begin with
|
|
|
a letter ([A-Za-z]) and may be followed by any number
|
|
|
of letters, digits ([0-9]), hyphens ("-"), underscores
|
|
|
("_"), colons (":"), and periods (".")'. These regexps
|
|
|
are slightly over-zealous, in that they remove colons
|
|
|
and periods unnecessarily.
|
|
|
|
|
|
Whitespace is transformed into underscores, and then
|
|
|
anything which is not a hyphen or a character that
|
|
|
matches \w (alphanumerics and underscore) is removed.
|
|
|
|
|
|
"""
|
|
|
# Transform all whitespace to underscore
|
|
|
idstring = re.sub(r'\s', "_", '%s' % idstring)
|
|
|
# Remove everything that is not a hyphen or a member of \w
|
|
|
idstring = re.sub(r'(?!-)\W', "", idstring).lower()
|
|
|
return idstring
|
|
|
|
|
|
def prepare(self, inline_diff=True):
|
|
|
"""
|
|
|
Prepare the passed udiff for HTML rendering. It'l return a list
|
|
|
of dicts with diff information
|
|
|
"""
|
|
|
parsed = self._parser(inline_diff=inline_diff)
|
|
|
self.parsed = True
|
|
|
self.parsed_diff = parsed
|
|
|
return parsed
|
|
|
|
|
|
def as_raw(self, diff_lines=None):
|
|
|
"""
|
|
|
Returns raw string diff
|
|
|
"""
|
|
|
return self._diff
|
|
|
#return u''.join(imap(self._line_counter, self._diff.splitlines(1)))
|
|
|
|
|
|
def as_html(self, table_class='code-difftable', line_class='line',
|
|
|
old_lineno_class='lineno old', new_lineno_class='lineno new',
|
|
|
code_class='code', enable_comments=False, parsed_lines=None):
|
|
|
"""
|
|
|
Return given diff as html table with customized css classes
|
|
|
"""
|
|
|
def _link_to_if(condition, label, url):
|
|
|
"""
|
|
|
Generates a link if condition is meet or just the label if not.
|
|
|
"""
|
|
|
|
|
|
if condition:
|
|
|
return '''<a href="%(url)s">%(label)s</a>''' % {
|
|
|
'url': url,
|
|
|
'label': label
|
|
|
}
|
|
|
else:
|
|
|
return label
|
|
|
if not self.parsed:
|
|
|
self.prepare()
|
|
|
|
|
|
diff_lines = self.parsed_diff
|
|
|
if parsed_lines:
|
|
|
diff_lines = parsed_lines
|
|
|
|
|
|
_html_empty = True
|
|
|
_html = []
|
|
|
_html.append('''<table class="%(table_class)s">\n''' % {
|
|
|
'table_class': table_class
|
|
|
})
|
|
|
|
|
|
for diff in diff_lines:
|
|
|
for line in diff['chunks']:
|
|
|
_html_empty = False
|
|
|
for change in line:
|
|
|
_html.append('''<tr class="%(lc)s %(action)s">\n''' % {
|
|
|
'lc': line_class,
|
|
|
'action': change['action']
|
|
|
})
|
|
|
anchor_old_id = ''
|
|
|
anchor_new_id = ''
|
|
|
anchor_old = "%(filename)s_o%(oldline_no)s" % {
|
|
|
'filename': self._safe_id(diff['filename']),
|
|
|
'oldline_no': change['old_lineno']
|
|
|
}
|
|
|
anchor_new = "%(filename)s_n%(oldline_no)s" % {
|
|
|
'filename': self._safe_id(diff['filename']),
|
|
|
'oldline_no': change['new_lineno']
|
|
|
}
|
|
|
cond_old = (change['old_lineno'] != '...' and
|
|
|
change['old_lineno'])
|
|
|
cond_new = (change['new_lineno'] != '...' and
|
|
|
change['new_lineno'])
|
|
|
if cond_old:
|
|
|
anchor_old_id = 'id="%s"' % anchor_old
|
|
|
if cond_new:
|
|
|
anchor_new_id = 'id="%s"' % anchor_new
|
|
|
###########################################################
|
|
|
# OLD LINE NUMBER
|
|
|
###########################################################
|
|
|
_html.append('''\t<td %(a_id)s class="%(olc)s">''' % {
|
|
|
'a_id': anchor_old_id,
|
|
|
'olc': old_lineno_class
|
|
|
})
|
|
|
|
|
|
_html.append('''%(link)s''' % {
|
|
|
'link': _link_to_if(True, change['old_lineno'],
|
|
|
'#%s' % anchor_old)
|
|
|
})
|
|
|
_html.append('''</td>\n''')
|
|
|
###########################################################
|
|
|
# NEW LINE NUMBER
|
|
|
###########################################################
|
|
|
|
|
|
_html.append('''\t<td %(a_id)s class="%(nlc)s">''' % {
|
|
|
'a_id': anchor_new_id,
|
|
|
'nlc': new_lineno_class
|
|
|
})
|
|
|
|
|
|
_html.append('''%(link)s''' % {
|
|
|
'link': _link_to_if(True, change['new_lineno'],
|
|
|
'#%s' % anchor_new)
|
|
|
})
|
|
|
_html.append('''</td>\n''')
|
|
|
###########################################################
|
|
|
# CODE
|
|
|
###########################################################
|
|
|
comments = '' if enable_comments else 'no-comment'
|
|
|
_html.append('''\t<td class="%(cc)s %(inc)s">''' % {
|
|
|
'cc': code_class,
|
|
|
'inc': comments
|
|
|
})
|
|
|
_html.append('''\n\t\t<pre>%(code)s</pre>\n''' % {
|
|
|
'code': change['line']
|
|
|
})
|
|
|
|
|
|
_html.append('''\t</td>''')
|
|
|
_html.append('''\n</tr>\n''')
|
|
|
_html.append('''</table>''')
|
|
|
if _html_empty:
|
|
|
return None
|
|
|
return ''.join(_html)
|
|
|
|
|
|
def stat(self):
|
|
|
"""
|
|
|
Returns tuple of added, and removed lines for this instance
|
|
|
"""
|
|
|
return self.adds, self.removes
|
|
|
|
