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# Copyright (C) 2011-2024 RhodeCode GmbH
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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 Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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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 Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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"""
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Set of diffing helpers, previously part of vcs
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"""
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import dataclasses
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import os
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import re
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import bz2
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import gzip
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import time
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import difflib
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import logging
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import pickle
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from itertools import tee
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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 import base
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from rhodecode.lib.str_utils import safe_str
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log = logging.getLogger(__name__)
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# define max context, a file with more than this numbers of lines is unusable
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# in browser anyway
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MAX_CONTEXT = 20 * 1024
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DEFAULT_CONTEXT = 3
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def get_diff_context(request):
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return MAX_CONTEXT if request.GET.get('fullcontext', '') == '1' else DEFAULT_CONTEXT
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def get_diff_whitespace_flag(request):
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return request.GET.get('ignorews', '') == '1'
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@dataclasses.dataclass
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class OPS:
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ADD: str = 'A'
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MOD: str = 'M'
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DEL: str = 'D'
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@dataclasses.dataclass
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class DiffLineNumber:
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old: int | None
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new: int | None
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def __iter__(self):
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yield self.old
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yield self.new
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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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# protect against IntOverflow when passing HUGE context
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if context > MAX_CONTEXT:
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context = MAX_CONTEXT
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submodules = [o for o in [filenode_new, filenode_old] if isinstance(o, SubModuleNode)]
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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(f"Given object should be FileNode object, not {filenode.__class__}")
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repo = filenode_new.commit.repository
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old_commit = filenode_old.commit or repo.EMPTY_COMMIT
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new_commit = filenode_new.commit
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vcs_gitdiff = repo.get_diff(
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old_commit, new_commit, filenode_new.path,
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ignore_whitespace, context, path1=filenode_old.path)
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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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COPIED_FILENODE = 5
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CHMOD_FILENODE = 6
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BIN_FILENODE = 7
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class LimitedDiffContainer(object):
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def __init__(self, diff_limit: int, 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 __getitem__(self, key):
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return self.diff.__getitem__(key)
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def __iter__(self):
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yield from self.diff
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class Action(object):
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"""
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Contains constants for the action value of the lines in a parsed diff.
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"""
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ADD = 'add'
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DELETE = 'del'
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UNMODIFIED = 'unmod'
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CONTEXT = 'context'
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OLD_NO_NL = 'old-no-nl'
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NEW_NO_NL = 'new-no-nl'
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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 an HTML template.
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.. note:: Unicode handling
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The original diffs are a byte sequence and can contain filenames
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in mixed encodings. This class generally returns `unicode` objects
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since the result is intended for presentation to the user.
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"""
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_chunk_re = re.compile(br'^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
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_newline_marker = re.compile(br'^\\ No newline at end of file')
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# used for inline highlighter word split
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_token_re = re.compile(br'()(>|<|&|\W+?)')
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# collapse ranges of commits over given number
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_collapse_commits_over = 5
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def __init__(self, diff: base.Diff, diff_format='gitdiff', diff_limit: int = 0,
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file_limit: int = 0, show_full_diff=True):
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"""
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:param diff: A `Diff` object representing a diff from a vcs backend
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:param diff_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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self._diff = diff
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self._format = diff_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_limit = diff_limit
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self.file_limit = file_limit
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self.show_full_diff = show_full_diff
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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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log.debug('Initialized DiffProcessor with %s mode', diff_format)
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self.differ = self._highlight_line_udiff
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self._parser = self._new_parse_gitdiff
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if diff_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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raise DeprecationWarning('gitdiff usage is deprecated')
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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, diff_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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"""
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self.cur_diff_size += len(diff_string)
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if not self.show_full_diff and (self.cur_diff_size > self.diff_limit):
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raise DiffLimitExceeded('Diff Limit Exceeded')
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return diff_string \
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.replace(b'&', b'&')\
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.replace(b'<', b'<')\
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.replace(b'>', b'>')
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def _line_counter(self, diff_line):
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"""
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Checks each line and bumps total adds/removes for this diff
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:param diff_line:
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"""
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if diff_line.startswith(b'+') and not diff_line.startswith(b'+++'):
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self.adds += 1
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elif diff_line.startswith(b'-') and not diff_line.startswith(b'---'):
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self.removes += 1
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return diff_line
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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'] == Action.DELETE:
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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 = f'<del>{oldfrag}</del>'
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if newfrag:
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newfrag = f'<ins>{newfrag}</ins>'
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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'] == 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'] = f"{l['line'][:start]}<{tag}>{l['line'][start:last]}</{tag}>{l['line'][last:]}"
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do(line)
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do(next_)
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def _clean_line(self, line, command: str):
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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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def diff_container(arg):
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return arg
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for chunk in self._diff.chunks():
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head = chunk.header
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diff = map(self._escaper, self.diff_splitter(chunk.diff))
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raw_diff = chunk.raw
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limited_diff = False
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exceeds_limit = False
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op = None
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stats = {
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'added': 0,
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'deleted': 0,
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'binary': False,
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'ops': {},
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}
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if head['deleted_file_mode']:
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op = OPS.DEL
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stats['binary'] = True
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stats['ops'][DEL_FILENODE] = 'deleted file'
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elif head['new_file_mode']:
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op = OPS.ADD
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stats['binary'] = True
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stats['ops'][NEW_FILENODE] = f"new file {safe_str(head['new_file_mode'])}"
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else: # modify operation, can be: copy, rename or chmod
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# CHMOD
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if head['new_mode'] and head['old_mode']:
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op = OPS.MOD
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stats['binary'] = True
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stats['ops'][CHMOD_FILENODE] = f"modified file chmod {safe_str(head['old_mode'])} => {safe_str(head['new_mode'])}"
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# RENAME
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if head['rename_from'] != head['rename_to']:
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op = OPS.MOD
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stats['binary'] = True
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stats['ops'][RENAMED_FILENODE] = f"file renamed from {safe_str(head['rename_from'])} to {safe_str(head['rename_to'])}"
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# COPY
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if head.get('copy_from') and head.get('copy_to'):
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op = OPS.MOD
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stats['binary'] = True
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stats['ops'][COPIED_FILENODE] = f"file copied from {safe_str(head['copy_from'])} to {safe_str(head['copy_to'])}"
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# If our new parsed headers didn't match anything fallback to
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# old style detection
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if op is None:
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if not head['a_file'] and head['b_file']:
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op = OPS.ADD
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stats['binary'] = True
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stats['ops'][NEW_FILENODE] = 'new file'
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elif head['a_file'] and not head['b_file']:
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op = OPS.DEL
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stats['binary'] = True
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stats['ops'][DEL_FILENODE] = 'deleted file'
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# it's not ADD not DELETE
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if op is None:
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op = OPS.MOD
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stats['binary'] = True
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stats['ops'][MOD_FILENODE] = 'modified file'
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# a real non-binary diff
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if head['a_file'] or head['b_file']:
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try:
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raw_diff, chunks, _stats = self._parse_lines(diff)
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stats['binary'] = False
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stats['added'] = _stats[0]
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stats['deleted'] = _stats[1]
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# explicit mark that it's a modified file
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if op == OPS.MOD:
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stats['ops'][MOD_FILENODE] = 'modified file'
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exceeds_limit = len(raw_diff) > self.file_limit
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# changed from _escaper function so we validate size of
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# each file instead of the whole diff
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# diff will hide big files but still show small ones
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# from my tests, big files are fairly safe to be parsed
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# but the browser is the bottleneck
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if not self.show_full_diff and exceeds_limit:
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raise DiffLimitExceeded('File Limit Exceeded')
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except DiffLimitExceeded:
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def diff_container(_diff):
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return LimitedDiffContainer(self.diff_limit, self.cur_diff_size, _diff)
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exceeds_limit = len(raw_diff) > self.file_limit
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limited_diff = True
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chunks = []
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else: # GIT format binary patch, or possibly empty diff
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if head['bin_patch']:
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# we have operation already extracted, but we mark simply
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# it's a diff we won't show for binary files
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stats['ops'][BIN_FILENODE] = 'binary diff hidden'
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chunks = []
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if chunks and not self.show_full_diff and op == OPS.DEL:
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# if not full diff mode show deleted file contents
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# TODO: anderson: if the view is not too big, there is no way
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# to see the content of the file
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chunks = []
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frag = [{
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'old_lineno': '',
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'new_lineno': '',
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'action': Action.CONTEXT,
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'line': msg,
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} for _op, msg in list(stats['ops'].items())
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if _op not in [MOD_FILENODE]]
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chunks.insert(0, frag)
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_files.append({
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'filename': safe_str(head['b_path']),
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'old_revision': head['a_blob_id'],
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'new_revision': head['b_blob_id'],
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'chunks': chunks,
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'raw_diff': safe_str(raw_diff),
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'operation': op,
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'stats': stats,
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'exceeds_limit': exceeds_limit,
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'is_limited_diff': limited_diff,
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})
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def operation_sorter(info):
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return {OPS.ADD: 0, OPS.MOD: 1, OPS.DEL: 2}.get(info['operation'])
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if not inline_diff:
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return diff_container(sorted(_files, key=operation_sorter))
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# highlight inline changes
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for diff_data in _files:
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for chunk in diff_data['chunks']:
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lineiter = iter(chunk)
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try:
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while 1:
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line = next(lineiter)
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if line['action'] not in (
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Action.UNMODIFIED, Action.CONTEXT):
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nextline = next(lineiter)
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if nextline['action'] in ['unmod', 'context'] or \
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nextline['action'] == line['action']:
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continue
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self.differ(line, nextline)
|
|
|
except StopIteration:
|
|
|
pass
|
|
|
|
|
|
return diff_container(sorted(_files, key=operation_sorter))
|
|
|
|
|
|
def _check_large_diff(self):
|
|
|
if self.diff_limit:
|
|
|
log.debug('Checking if diff exceeds current diff_limit of %s', self.diff_limit)
|
|
|
if not self.show_full_diff and (self.cur_diff_size > self.diff_limit):
|
|
|
raise DiffLimitExceeded(f'Diff Limit `{self.diff_limit}` Exceeded')
|
|
|
|
|
|
# FIXME: NEWDIFFS: dan: this replaces _parse_gitdiff
|
|
|
def _new_parse_gitdiff(self, inline_diff=True):
|
|
|
_files = []
|
|
|
|
|
|
# this can be overridden later to a LimitedDiffContainer type
|
|
|
def diff_container(arg):
|
|
|
return arg
|
|
|
|
|
|
for chunk in self._diff.chunks():
|
|
|
bytes_head = chunk.header
|
|
|
head = chunk.header_as_str
|
|
|
|
|
|
log.debug('parsing diff chunk %r', chunk)
|
|
|
|
|
|
raw_diff = chunk.raw
|
|
|
limited_diff = False
|
|
|
exceeds_limit = False
|
|
|
|
|
|
op = None
|
|
|
stats = {
|
|
|
'added': 0,
|
|
|
'deleted': 0,
|
|
|
'binary': False,
|
|
|
'old_mode': '',
|
|
|
'new_mode': '',
|
|
|
'ops': {},
|
|
|
}
|
|
|
if head['old_mode']:
|
|
|
stats['old_mode'] = head['old_mode']
|
|
|
if head['new_mode']:
|
|
|
stats['new_mode'] = head['new_mode']
|
|
|
if head['b_mode']:
|
|
|
stats['new_mode'] = head['b_mode']
|
|
|
|
|
|
# delete file
|
|
|
if head['deleted_file_mode']:
|
|
|
op = OPS.DEL
|
|
|
stats['binary'] = True
|
|
|
stats['ops'][DEL_FILENODE] = 'deleted file'
|
|
|
|
|
|
# new file
|
|
|
elif head['new_file_mode']:
|
|
|
op = OPS.ADD
|
|
|
stats['binary'] = True
|
|
|
stats['old_mode'] = ''
|
|
|
stats['new_mode'] = head['new_file_mode']
|
|
|
stats['ops'][NEW_FILENODE] = f"new file {head['new_file_mode']}"
|
|
|
|
|
|
# modify operation, can be: copy, rename or chmod
|
|
|
else:
|
|
|
# CHMOD
|
|
|
if head['new_mode'] and head['old_mode']:
|
|
|
op = OPS.MOD
|
|
|
stats['binary'] = True
|
|
|
stats['ops'][CHMOD_FILENODE] = f"modified file chmod {head['old_mode']} => {head['new_mode']}"
|
|
|
|
|
|
# RENAME
|
|
|
if head['rename_from'] != head['rename_to']:
|
|
|
op = OPS.MOD
|
|
|
stats['binary'] = True
|
|
|
stats['renamed'] = (head['rename_from'], head['rename_to'])
|
|
|
stats['ops'][RENAMED_FILENODE] = f"file renamed from {head['rename_from']} to {head['rename_to']}"
|
|
|
# COPY
|
|
|
if head.get('copy_from') and head.get('copy_to'):
|
|
|
op = OPS.MOD
|
|
|
stats['binary'] = True
|
|
|
stats['copied'] = (head['copy_from'], head['copy_to'])
|
|
|
stats['ops'][COPIED_FILENODE] = f"file copied from {head['copy_from']} to {head['copy_to']}"
|
|
|
|
|
|
# If our new parsed headers didn't match anything fallback to
|
|
|
# old style detection
|
|
|
if op is None:
|
|
|
if not head['a_file'] and head['b_file']:
|
|
|
op = OPS.ADD
|
|
|
stats['binary'] = True
|
|
|
stats['new_file'] = True
|
|
|
stats['ops'][NEW_FILENODE] = 'new file'
|
|
|
|
|
|
elif head['a_file'] and not head['b_file']:
|
|
|
op = OPS.DEL
|
|
|
stats['binary'] = True
|
|
|
stats['ops'][DEL_FILENODE] = 'deleted file'
|
|
|
|
|
|
# it's not ADD not DELETE
|
|
|
if op is None:
|
|
|
op = OPS.MOD
|
|
|
stats['binary'] = True
|
|
|
stats['ops'][MOD_FILENODE] = 'modified file'
|
|
|
|
|
|
# a real non-binary diff
|
|
|
if head['a_file'] or head['b_file']:
|
|
|
# simulate splitlines, so we keep the line end part
|
|
|
diff = self.diff_splitter(chunk.diff)
|
|
|
|
|
|
# append each file to the diff size
|
|
|
raw_chunk_size = len(raw_diff)
|
|
|
|
|
|
exceeds_limit = raw_chunk_size > self.file_limit
|
|
|
self.cur_diff_size += raw_chunk_size
|
|
|
|
|
|
try:
|
|
|
# Check each file instead of the whole diff.
|
|
|
# Diff will hide big files but still show small ones.
|
|
|
# From the tests big files are fairly safe to be parsed
|
|
|
# but the browser is the bottleneck.
|
|
|
if not self.show_full_diff and exceeds_limit:
|
|
|
log.debug('File `%s` exceeds current file_limit of %s',
|
|
|
head['b_path'], self.file_limit)
|
|
|
raise DiffLimitExceeded(f'File Limit {self.file_limit} Exceeded')
|
|
|
|
|
|
self._check_large_diff()
|
|
|
|
|
|
raw_diff, chunks, _stats = self._new_parse_lines(diff)
|
|
|
stats['binary'] = False
|
|
|
stats['added'] = _stats[0]
|
|
|
stats['deleted'] = _stats[1]
|
|
|
# explicit mark that it's a modified file
|
|
|
if op == OPS.MOD:
|
|
|
stats['ops'][MOD_FILENODE] = 'modified file'
|
|
|
|
|
|
except DiffLimitExceeded:
|
|
|
def limited_diff_container(_diff):
|
|
|
return LimitedDiffContainer(self.diff_limit, self.cur_diff_size, _diff)
|
|
|
|
|
|
# re-definition of our container wrapper
|
|
|
diff_container = limited_diff_container
|
|
|
|
|
|
limited_diff = True
|
|
|
chunks = []
|
|
|
|
|
|
else: # GIT format binary patch, or possibly empty diff
|
|
|
if head['bin_patch']:
|
|
|
# we have operation already extracted, but we mark simply
|
|
|
# it's a diff we won't show for binary files
|
|
|
stats['ops'][BIN_FILENODE] = 'binary diff hidden'
|
|
|
chunks = []
|
|
|
|
|
|
# Hide content of deleted node by setting empty chunks
|
|
|
if chunks and not self.show_full_diff and op == OPS.DEL:
|
|
|
# if not full diff mode show deleted file contents
|
|
|
# TODO: anderson: if the view is not too big, there is no way
|
|
|
# to see the content of the file
|
|
|
chunks = []
|
|
|
|
|
|
frag = [
|
|
|
{'old_lineno': '',
|
|
|
'new_lineno': '',
|
|
|
'action': Action.CONTEXT,
|
|
|
'line': msg,
|
|
|
} for _op, msg in list(stats['ops'].items())
|
|
|
if _op not in [MOD_FILENODE]]
|
|
|
|
|
|
chunks.insert(0, frag)
|
|
|
|
|
|
original_filename = head['a_path']
|
|
|
original_filename_bytes = bytes_head['a_path']
|
|
|
|
|
|
filename = head['b_path']
|
|
|
filename_bytes = bytes_head['b_path']
|
|
|
|
|
|
_files.append({
|
|
|
'original_filename': original_filename,
|
|
|
'original_filename_bytes': original_filename_bytes,
|
|
|
'filename': filename,
|
|
|
'filename_bytes': filename_bytes,
|
|
|
'old_revision': head['a_blob_id'],
|
|
|
'new_revision': head['b_blob_id'],
|
|
|
'chunks': chunks,
|
|
|
'raw_diff': safe_str(raw_diff),
|
|
|
'operation': op,
|
|
|
'stats': stats,
|
|
|
'exceeds_limit': exceeds_limit,
|
|
|
'is_limited_diff': limited_diff,
|
|
|
})
|
|
|
|
|
|
def sorter(info):
|
|
|
return {OPS.ADD: 0, OPS.MOD: 1, OPS.DEL: 2}.get(info['operation'])
|
|
|
return diff_container(sorted(_files, key=sorter))
|
|
|
|
|
|
# FIXME: NEWDIFFS: dan: this gets replaced by _new_parse_lines
|
|
|
def _parse_lines(self, diff_iter):
|
|
|
"""
|
|
|
Parse the diff an return data for the template.
|
|
|
"""
|
|
|
|
|
|
stats = [0, 0]
|
|
|
chunks = []
|
|
|
raw_diff = []
|
|
|
|
|
|
try:
|
|
|
line = next(diff_iter)
|
|
|
|
|
|
while line:
|
|
|
raw_diff.append(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': Action.CONTEXT,
|
|
|
'line': line,
|
|
|
})
|
|
|
|
|
|
line = next(diff_iter)
|
|
|
|
|
|
while old_line < old_end or new_line < new_end:
|
|
|
command = b' '
|
|
|
if line:
|
|
|
command = line[0]
|
|
|
|
|
|
affects_old = affects_new = False
|
|
|
|
|
|
# ignore those if we don't expect them
|
|
|
if command in b'#@':
|
|
|
continue
|
|
|
elif command == b'+':
|
|
|
affects_new = True
|
|
|
action = Action.ADD
|
|
|
stats[0] += 1
|
|
|
elif command == b'-':
|
|
|
affects_old = True
|
|
|
action = Action.DELETE
|
|
|
stats[1] += 1
|
|
|
else:
|
|
|
affects_old = affects_new = True
|
|
|
action = Action.UNMODIFIED
|
|
|
|
|
|
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 b'',
|
|
|
'new_lineno': affects_new and new_line or b'',
|
|
|
'action': action,
|
|
|
'line': self._clean_line(line, command)
|
|
|
})
|
|
|
raw_diff.append(line)
|
|
|
|
|
|
line = next(diff_iter)
|
|
|
|
|
|
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': Action.CONTEXT,
|
|
|
'line': self._clean_line(line, command)
|
|
|
})
|
|
|
|
|
|
except StopIteration:
|
|
|
pass
|
|
|
return ''.join(raw_diff), chunks, stats
|
|
|
|
|
|
# FIXME: NEWDIFFS: dan: this replaces _parse_lines
|
|
|
def _new_parse_lines(self, diff_iter):
|
|
|
"""
|
|
|
Parse the diff an return data for the template.
|
|
|
"""
|
|
|
|
|
|
stats = [0, 0]
|
|
|
chunks = []
|
|
|
raw_diff = []
|
|
|
|
|
|
try:
|
|
|
line = next(diff_iter)
|
|
|
assert isinstance(line, bytes)
|
|
|
|
|
|
while line:
|
|
|
raw_diff.append(line)
|
|
|
# match header e.g @@ -0,0 +1 @@\n'
|
|
|
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]]
|
|
|
|
|
|
lines = []
|
|
|
hunk = {
|
|
|
'section_header': gr[-1],
|
|
|
'source_start': old_line,
|
|
|
'source_length': old_end,
|
|
|
'target_start': new_line,
|
|
|
'target_length': new_end,
|
|
|
'lines': lines,
|
|
|
}
|
|
|
chunks.append(hunk)
|
|
|
|
|
|
old_line -= 1
|
|
|
new_line -= 1
|
|
|
|
|
|
len(gr) == 5
|
|
|
old_end += old_line
|
|
|
new_end += new_line
|
|
|
|
|
|
line = next(diff_iter)
|
|
|
|
|
|
while old_line < old_end or new_line < new_end:
|
|
|
command = ' '
|
|
|
if line:
|
|
|
# This is bytes, so we need to convert it to a str
|
|
|
command: str = chr(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 = Action.ADD
|
|
|
stats[0] += 1
|
|
|
elif command == '-':
|
|
|
affects_old = True
|
|
|
action = Action.DELETE
|
|
|
stats[1] += 1
|
|
|
else:
|
|
|
affects_old = affects_new = True
|
|
|
action = Action.UNMODIFIED
|
|
|
|
|
|
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 None,
|
|
|
'new_lineno': affects_new and new_line or None,
|
|
|
'action': action,
|
|
|
'line': self._clean_line(line, command)
|
|
|
})
|
|
|
raw_diff.append(line)
|
|
|
|
|
|
line = next(diff_iter)
|
|
|
|
|
|
if self._newline_marker.match(line):
|
|
|
# we need to append to lines, since this is not
|
|
|
# counted in the line specs of diff
|
|
|
if affects_old:
|
|
|
action = Action.OLD_NO_NL
|
|
|
elif affects_new:
|
|
|
action = Action.NEW_NO_NL
|
|
|
else:
|
|
|
raise Exception('invalid context for no newline')
|
|
|
|
|
|
lines.append({
|
|
|
'old_lineno': None,
|
|
|
'new_lineno': None,
|
|
|
'action': action,
|
|
|
'line': self._clean_line(line, command)
|
|
|
})
|
|
|
|
|
|
except StopIteration:
|
|
|
pass
|
|
|
|
|
|
return b''.join(raw_diff), chunks, stats
|
|
|
|
|
|
def _safe_id(self, idstring):
|
|
|
r"""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', "_", f'{idstring}')
|
|
|
# Remove everything that is not a hyphen or a member of \w
|
|
|
idstring = re.sub(r'(?!-)\W', "", idstring).lower()
|
|
|
return idstring
|
|
|
|
|
|
@classmethod
|
|
|
def diff_splitter(cls, diff_string: bytes):
|
|
|
"""
|
|
|
Diff split that emulates .splitlines() but works only on \n
|
|
|
"""
|
|
|
if not diff_string:
|
|
|
return
|
|
|
elif diff_string == b'\n':
|
|
|
yield b'\n'
|
|
|
else:
|
|
|
|
|
|
has_newline = diff_string.endswith(b'\n')
|
|
|
elements = diff_string.split(b'\n')
|
|
|
if has_newline:
|
|
|
# skip last element as it's empty string from newlines
|
|
|
elements = elements[:-1]
|
|
|
|
|
|
len_elements = len(elements)
|
|
|
|
|
|
for cnt, line in enumerate(elements, start=1):
|
|
|
last_line = cnt == len_elements
|
|
|
if last_line and not has_newline:
|
|
|
yield line
|
|
|
else:
|
|
|
yield line + b'\n'
|
|
|
|
|
|
def prepare(self, inline_diff=True):
|
|
|
"""
|
|
|
Prepare the passed udiff for HTML rendering.
|
|
|
|
|
|
: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 diff as a byte string
|
|
|
"""
|
|
|
return self._diff.raw.tobytes()
|
|
|
|
|
|
def stat(self):
|
|
|
"""
|
|
|
Returns tuple of added, and removed lines for this instance
|
|
|
"""
|
|
|
return self.adds, self.removes
|
|
|
|
|
|
def get_context_of_line(
|
|
|
self, path, diff_line: DiffLineNumber = None, context_before: int = 3, context_after: int = 3):
|
|
|
"""
|
|
|
Returns the context lines for the specified diff line.
|
|
|
"""
|
|
|
assert self.parsed, "DiffProcessor is not initialized."
|
|
|
|
|
|
if None not in diff_line:
|
|
|
raise ValueError(f"Cannot specify both line numbers in diff_line: {diff_line}")
|
|
|
|
|
|
file_diff = self._get_file_diff(path)
|
|
|
chunk, idx = self._find_chunk_line_index(file_diff, diff_line)
|
|
|
|
|
|
first_line_to_include = max(idx - context_before, 0)
|
|
|
first_line_after_context = idx + context_after + 1
|
|
|
context_lines = chunk['lines'][first_line_to_include:first_line_after_context]
|
|
|
|
|
|
line_contents = [
|
|
|
_context_line(line) for line in context_lines
|
|
|
if _is_diff_content(line)
|
|
|
]
|
|
|
|
|
|
# TODO: johbo: Interim fixup, the diff chunks drop the final newline.
|
|
|
# Once they are fixed, we can drop this line here.
|
|
|
if line_contents:
|
|
|
line_contents[-1] = (
|
|
|
line_contents[-1][0], line_contents[-1][1].rstrip(b'\n') + b'\n')
|
|
|
return line_contents
|
|
|
|
|
|
def find_context(self, path, context, offset=0):
|
|
|
"""
|
|
|
Finds the given `context` inside of the diff.
|
|
|
|
|
|
Use the parameter `offset` to specify which offset the target line has
|
|
|
inside of the given `context`. This way the correct diff line will be
|
|
|
returned.
|
|
|
|
|
|
:param offset: Shall be used to specify the offset of the main line
|
|
|
within the given `context`.
|
|
|
"""
|
|
|
if offset < 0 or offset >= len(context):
|
|
|
raise ValueError(
|
|
|
"Only positive values up to the length of the context "
|
|
|
"minus one are allowed.")
|
|
|
|
|
|
matches = []
|
|
|
file_diff = self._get_file_diff(path)
|
|
|
|
|
|
for chunk in file_diff['chunks']:
|
|
|
if not isinstance(chunk, dict):
|
|
|
continue
|
|
|
context_iter = iter(context)
|
|
|
for line_idx, line in enumerate(chunk['lines']):
|
|
|
try:
|
|
|
if _context_line(line) == next(context_iter):
|
|
|
continue
|
|
|
except StopIteration:
|
|
|
matches.append((line_idx, chunk))
|
|
|
context_iter = iter(context)
|
|
|
|
|
|
# Increment position and triger StopIteration
|
|
|
# if we had a match at the end
|
|
|
line_idx += 1
|
|
|
try:
|
|
|
next(context_iter)
|
|
|
except StopIteration:
|
|
|
matches.append((line_idx, chunk))
|
|
|
|
|
|
effective_offset = len(context) - offset
|
|
|
found_at_diff_lines = [
|
|
|
_line_to_diff_line_number(chunk['lines'][idx - effective_offset])
|
|
|
for idx, chunk in matches]
|
|
|
|
|
|
return found_at_diff_lines
|
|
|
|
|
|
def _get_file_diff(self, path):
|
|
|
for file_diff in self.parsed_diff:
|
|
|
if file_diff['filename'] == path:
|
|
|
break
|
|
|
else:
|
|
|
raise FileNotInDiffException(f"File {path} not in diff")
|
|
|
return file_diff
|
|
|
|
|
|
def _find_chunk_line_index(self, file_diff, diff_line):
|
|
|
for chunk in file_diff['chunks']:
|
|
|
if not isinstance(chunk, dict):
|
|
|
continue
|
|
|
for line_idx, line in enumerate(chunk['lines']):
|
|
|
if diff_line.old and line['old_lineno'] == diff_line.old:
|
|
|
return chunk, line_idx
|
|
|
if diff_line.new and line['new_lineno'] == diff_line.new:
|
|
|
return chunk, line_idx
|
|
|
raise LineNotInDiffException(f"The line {diff_line} is not part of the diff.")
|
|
|
|
|
|
|
|
|
def _is_diff_content(line):
|
|
|
return line['action'] in (
|
|
|
Action.UNMODIFIED, Action.ADD, Action.DELETE)
|
|
|
|
|
|
|
|
|
def _context_line(line):
|
|
|
return line['action'], line['line']
|
|
|
|
|
|
|
|
|
def _line_to_diff_line_number(line):
|
|
|
new_line_no = line['new_lineno'] or None
|
|
|
old_line_no = line['old_lineno'] or None
|
|
|
return DiffLineNumber(old=old_line_no, new=new_line_no)
|
|
|
|
|
|
|
|
|
class FileNotInDiffException(Exception):
|
|
|
"""
|
|
|
Raised when the context for a missing file is requested.
|
|
|
|
|
|
If you request the context for a line in a file which is not part of the
|
|
|
given diff, then this exception is raised.
|
|
|
"""
|
|
|
|
|
|
|
|
|
class LineNotInDiffException(Exception):
|
|
|
"""
|
|
|
Raised when the context for a missing line is requested.
|
|
|
|
|
|
If you request the context for a line in a file and this line is not
|
|
|
part of the given diff, then this exception is raised.
|
|
|
"""
|
|
|
|
|
|
|
|
|
class DiffLimitExceeded(Exception):
|
|
|
pass
|
|
|
|
|
|
|
|
|
# NOTE(marcink): if diffs.mako change, probably this
|
|
|
# needs a bump to next version
|
|
|
CURRENT_DIFF_VERSION = 'v5'
|
|
|
|
|
|
|
|
|
def _cleanup_cache_file(cached_diff_file):
|
|
|
# cleanup file to not store it "damaged"
|
|
|
try:
|
|
|
os.remove(cached_diff_file)
|
|
|
except Exception:
|
|
|
log.exception('Failed to cleanup path %s', cached_diff_file)
|
|
|
|
|
|
|
|
|
def _get_compression_mode(cached_diff_file):
|
|
|
mode = 'bz2'
|
|
|
if 'mode:plain' in cached_diff_file:
|
|
|
mode = 'plain'
|
|
|
elif 'mode:gzip' in cached_diff_file:
|
|
|
mode = 'gzip'
|
|
|
return mode
|
|
|
|
|
|
|
|
|
def cache_diff(cached_diff_file, diff, commits):
|
|
|
compression_mode = _get_compression_mode(cached_diff_file)
|
|
|
|
|
|
struct = {
|
|
|
'version': CURRENT_DIFF_VERSION,
|
|
|
'diff': diff,
|
|
|
'commits': commits
|
|
|
}
|
|
|
|
|
|
start = time.time()
|
|
|
try:
|
|
|
if compression_mode == 'plain':
|
|
|
with open(cached_diff_file, 'wb') as f:
|
|
|
pickle.dump(struct, f)
|
|
|
elif compression_mode == 'gzip':
|
|
|
with gzip.GzipFile(cached_diff_file, 'wb') as f:
|
|
|
pickle.dump(struct, f)
|
|
|
else:
|
|
|
with bz2.BZ2File(cached_diff_file, 'wb') as f:
|
|
|
pickle.dump(struct, f)
|
|
|
except Exception:
|
|
|
log.warning('Failed to save cache', exc_info=True)
|
|
|
_cleanup_cache_file(cached_diff_file)
|
|
|
|
|
|
log.debug('Saved diff cache under %s in %.4fs', cached_diff_file, time.time() - start)
|
|
|
|
|
|
|
|
|
def load_cached_diff(cached_diff_file):
|
|
|
compression_mode = _get_compression_mode(cached_diff_file)
|
|
|
|
|
|
default_struct = {
|
|
|
'version': CURRENT_DIFF_VERSION,
|
|
|
'diff': None,
|
|
|
'commits': None
|
|
|
}
|
|
|
|
|
|
has_cache = os.path.isfile(cached_diff_file)
|
|
|
if not has_cache:
|
|
|
log.debug('Reading diff cache file failed %s', cached_diff_file)
|
|
|
return default_struct
|
|
|
|
|
|
data = None
|
|
|
|
|
|
start = time.time()
|
|
|
try:
|
|
|
if compression_mode == 'plain':
|
|
|
with open(cached_diff_file, 'rb') as f:
|
|
|
data = pickle.load(f)
|
|
|
elif compression_mode == 'gzip':
|
|
|
with gzip.GzipFile(cached_diff_file, 'rb') as f:
|
|
|
data = pickle.load(f)
|
|
|
else:
|
|
|
with bz2.BZ2File(cached_diff_file, 'rb') as f:
|
|
|
data = pickle.load(f)
|
|
|
except Exception:
|
|
|
log.warning('Failed to read diff cache file', exc_info=True)
|
|
|
|
|
|
if not data:
|
|
|
data = default_struct
|
|
|
|
|
|
if not isinstance(data, dict):
|
|
|
# old version of data ?
|
|
|
data = default_struct
|
|
|
|
|
|
# check version
|
|
|
if data.get('version') != CURRENT_DIFF_VERSION:
|
|
|
# purge cache
|
|
|
_cleanup_cache_file(cached_diff_file)
|
|
|
return default_struct
|
|
|
|
|
|
log.debug('Loaded diff cache from %s in %.4fs', cached_diff_file, time.time() - start)
|
|
|
|
|
|
return data
|
|
|
|
|
|
|
|
|
def generate_diff_cache_key(*args):
|
|
|
"""
|
|
|
Helper to generate a cache key using arguments
|
|
|
"""
|
|
|
def arg_mapper(input_param):
|
|
|
input_param = safe_str(input_param)
|
|
|
# we cannot allow '/' in arguments since it would allow
|
|
|
# subdirectory usage
|
|
|
input_param.replace('/', '_')
|
|
|
return input_param or None # prevent empty string arguments
|
|
|
|
|
|
return '_'.join([
|
|
|
'{}' for _i in range(len(args))]).format(*list(map(arg_mapper, args)))
|
|
|
|
|
|
|
|
|
def diff_cache_exist(cache_storage, *args):
|
|
|
"""
|
|
|
Based on all generated arguments check and return a cache path
|
|
|
"""
|
|
|
args = list(args) + ['mode:gzip']
|
|
|
cache_key = generate_diff_cache_key(*args)
|
|
|
cache_file_path = os.path.join(cache_storage, cache_key)
|
|
|
# prevent path traversal attacks using some param that have e.g '../../'
|
|
|
if not os.path.abspath(cache_file_path).startswith(cache_storage):
|
|
|
raise ValueError(f'Final path must be within {cache_storage}')
|
|
|
|
|
|
return cache_file_path
|
|
|
|
