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diffs.py
1170 lines | 42.2 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# Copyright (C) 2011-2017 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/
"""
Set of diffing helpers, previously part of vcs
"""
import collections
import re
import difflib
import logging
from itertools import tee, imap
from pylons.i18n.translation import _
from rhodecode.lib.vcs.exceptions import VCSError
from rhodecode.lib.vcs.nodes import FileNode, SubModuleNode
from rhodecode.lib.vcs.backends.base import EmptyCommit
from rhodecode.lib.helpers import escape
from rhodecode.lib.utils2 import safe_unicode
log = logging.getLogger(__name__)
# define max context, a file with more than this numbers of lines is unusable
# in browser anyway
MAX_CONTEXT = 1024 * 1014
class OPS(object):
ADD = 'A'
MOD = 'M'
DEL = 'D'
def wrap_to_table(str_):
return '''<table class="code-difftable">
<tr class="line no-comment">
<td class="add-comment-line tooltip" title="%s"><span class="add-comment-content"></span></td>
<td></td>
<td class="lineno new"></td>
<td class="code no-comment"><pre>%s</pre></td>
</tr>
</table>''' % (_('Click to comment'), str_)
def wrapped_diff(filenode_old, filenode_new, diff_limit=None, file_limit=None,
show_full_diff=False, ignore_whitespace=True, line_context=3,
enable_comments=False):
"""
returns a wrapped diff into a table, checks for cut_off_limit for file and
whole diff and presents proper message
"""
if filenode_old is None:
filenode_old = FileNode(filenode_new.path, '', EmptyCommit())
if filenode_old.is_binary or filenode_new.is_binary:
diff = wrap_to_table(_('Binary file'))
stats = None
size = 0
data = None
elif diff_limit != -1 and (diff_limit is None or
(filenode_old.size < diff_limit and filenode_new.size < diff_limit)):
f_gitdiff = get_gitdiff(filenode_old, filenode_new,
ignore_whitespace=ignore_whitespace,
context=line_context)
diff_processor = DiffProcessor(
f_gitdiff, format='gitdiff', diff_limit=diff_limit,
file_limit=file_limit, show_full_diff=show_full_diff)
_parsed = diff_processor.prepare()
diff = diff_processor.as_html(enable_comments=enable_comments)
stats = _parsed[0]['stats'] if _parsed else None
size = len(diff or '')
data = _parsed[0] if _parsed else None
else:
diff = wrap_to_table(_('Changeset was too big and was cut off, use '
'diff menu to display this diff'))
stats = None
size = 0
data = None
if not diff:
submodules = filter(lambda o: isinstance(o, SubModuleNode),
[filenode_new, filenode_old])
if submodules:
diff = wrap_to_table(escape('Submodule %r' % submodules[0]))
else:
diff = wrap_to_table(_('No changes detected'))
cs1 = filenode_old.commit.raw_id
cs2 = filenode_new.commit.raw_id
return size, cs1, cs2, diff, stats, data
def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True, context=3):
"""
Returns git style diff between given ``filenode_old`` and ``filenode_new``.
:param ignore_whitespace: ignore whitespaces in diff
"""
# make sure we pass in default context
context = context or 3
# protect against IntOverflow when passing HUGE context
if context > MAX_CONTEXT:
context = MAX_CONTEXT
submodules = filter(lambda o: isinstance(o, SubModuleNode),
[filenode_new, filenode_old])
if submodules:
return ''
for filenode in (filenode_old, filenode_new):
if not isinstance(filenode, FileNode):
raise VCSError(
"Given object should be FileNode object, not %s"
% filenode.__class__)
repo = filenode_new.commit.repository
old_commit = filenode_old.commit or repo.EMPTY_COMMIT
new_commit = filenode_new.commit
vcs_gitdiff = repo.get_diff(
old_commit, new_commit, filenode_new.path,
ignore_whitespace, context, path1=filenode_old.path)
return vcs_gitdiff
NEW_FILENODE = 1
DEL_FILENODE = 2
MOD_FILENODE = 3
RENAMED_FILENODE = 4
COPIED_FILENODE = 5
CHMOD_FILENODE = 6
BIN_FILENODE = 7
class LimitedDiffContainer(object):
def __init__(self, diff_limit, cur_diff_size, diff):
self.diff = diff
self.diff_limit = diff_limit
self.cur_diff_size = cur_diff_size
def __getitem__(self, key):
return self.diff.__getitem__(key)
def __iter__(self):
for l in self.diff:
yield l
class Action(object):
"""
Contains constants for the action value of the lines in a parsed diff.
"""
ADD = 'add'
DELETE = 'del'
UNMODIFIED = 'unmod'
CONTEXT = 'context'
OLD_NO_NL = 'old-no-nl'
NEW_NO_NL = 'new-no-nl'
class DiffProcessor(object):
"""
Give it a unified or git diff and it returns a list of the files that were
mentioned in the diff together with a dict of meta information that
can be used to render it in a HTML template.
.. note:: Unicode handling
The original diffs are a byte sequence and can contain filenames
in mixed encodings. This class generally returns `unicode` objects
since the result is intended for presentation to the user.
"""
_chunk_re = re.compile(r'^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
_newline_marker = re.compile(r'^\\ No newline at end of file')
# used for inline highlighter word split
_token_re = re.compile(r'()(&gt;|&lt;|&amp;|\W+?)')
# collapse ranges of commits over given number
_collapse_commits_over = 5
def __init__(self, diff, format='gitdiff', diff_limit=None,
file_limit=None, show_full_diff=True):
"""
:param diff: A `Diff` object representing a diff from a vcs backend
:param format: format of diff passed, `udiff` or `gitdiff`
:param diff_limit: define the size of diff that is considered "big"
based on that parameter cut off will be triggered, set to None
to show full diff
"""
self._diff = diff
self._format = format
self.adds = 0
self.removes = 0
# calculate diff size
self.diff_limit = diff_limit
self.file_limit = file_limit
self.show_full_diff = show_full_diff
self.cur_diff_size = 0
self.parsed = False
self.parsed_diff = []
log.debug('Initialized DiffProcessor with %s mode', format)
if format == 'gitdiff':
self.differ = self._highlight_line_difflib
self._parser = self._parse_gitdiff
else:
self.differ = self._highlight_line_udiff
self._parser = self._new_parse_gitdiff
def _copy_iterator(self):
"""
make a fresh copy of generator, we should not iterate thru
an original as it's needed for repeating operations on
this instance of DiffProcessor
"""
self.__udiff, iterator_copy = tee(self.__udiff)
return iterator_copy
def _escaper(self, string):
"""
Escaper for diff escapes special chars and checks the diff limit
:param string:
"""
self.cur_diff_size += len(string)
if not self.show_full_diff and (self.cur_diff_size > self.diff_limit):
raise DiffLimitExceeded('Diff Limit Exceeded')
return safe_unicode(string)\
.replace('&', '&amp;')\
.replace('<', '&lt;')\
.replace('>', '&gt;')
def _line_counter(self, l):
"""
Checks each line and bumps total adds/removes for this diff
:param l:
"""
if l.startswith('+') and not l.startswith('+++'):
self.adds += 1
elif l.startswith('-') and not l.startswith('---'):
self.removes += 1
return safe_unicode(l)
def _highlight_line_difflib(self, line, next_):
"""
Highlight inline changes in both lines.
"""
if line['action'] == Action.DELETE:
old, new = line, next_
else:
old, new = next_, line
oldwords = self._token_re.split(old['line'])
newwords = self._token_re.split(new['line'])
sequence = difflib.SequenceMatcher(None, oldwords, newwords)
oldfragments, newfragments = [], []
for tag, i1, i2, j1, j2 in sequence.get_opcodes():
oldfrag = ''.join(oldwords[i1:i2])
newfrag = ''.join(newwords[j1:j2])
if tag != 'equal':
if oldfrag:
oldfrag = '<del>%s</del>' % oldfrag
if newfrag:
newfrag = '<ins>%s</ins>' % newfrag
oldfragments.append(oldfrag)
newfragments.append(newfrag)
old['line'] = "".join(oldfragments)
new['line'] = "".join(newfragments)
def _highlight_line_udiff(self, line, next_):
"""
Highlight inline changes in both lines.
"""
start = 0
limit = min(len(line['line']), len(next_['line']))
while start < limit and line['line'][start] == next_['line'][start]:
start += 1
end = -1
limit -= start
while -end <= limit and line['line'][end] == next_['line'][end]:
end -= 1
end += 1
if start or end:
def do(l):
last = end + len(l['line'])
if l['action'] == Action.ADD:
tag = 'ins'
else:
tag = 'del'
l['line'] = '%s<%s>%s</%s>%s' % (
l['line'][:start],
tag,
l['line'][start:last],
tag,
l['line'][last:]
)
do(line)
do(next_)
def _clean_line(self, line, command):
if command in ['+', '-', ' ']:
# only modify the line if it's actually a diff thing
line = line[1:]
return line
def _parse_gitdiff(self, inline_diff=True):
_files = []
diff_container = lambda arg: arg
for chunk in self._diff.chunks():
head = chunk.header
diff = imap(self._escaper, chunk.diff.splitlines(1))
raw_diff = chunk.raw
limited_diff = False
exceeds_limit = False
op = None
stats = {
'added': 0,
'deleted': 0,
'binary': False,
'ops': {},
}
if head['deleted_file_mode']:
op = OPS.DEL
stats['binary'] = True
stats['ops'][DEL_FILENODE] = 'deleted file'
elif head['new_file_mode']:
op = OPS.ADD
stats['binary'] = True
stats['ops'][NEW_FILENODE] = 'new file %s' % head['new_file_mode']
else: # modify operation, can be copy, rename or chmod
# CHMOD
if head['new_mode'] and head['old_mode']:
op = OPS.MOD
stats['binary'] = True
stats['ops'][CHMOD_FILENODE] = (
'modified file chmod %s => %s' % (
head['old_mode'], head['new_mode']))
# RENAME
if head['rename_from'] != head['rename_to']:
op = OPS.MOD
stats['binary'] = True
stats['ops'][RENAMED_FILENODE] = (
'file renamed from %s to %s' % (
head['rename_from'], head['rename_to']))
# COPY
if head.get('copy_from') and head.get('copy_to'):
op = OPS.MOD
stats['binary'] = True
stats['ops'][COPIED_FILENODE] = (
'file copied from %s to %s' % (
head['copy_from'], 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['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']:
try:
raw_diff, chunks, _stats = self._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'
exceeds_limit = len(raw_diff) > self.file_limit
# changed from _escaper function so we validate size of
# each file instead of the whole diff
# diff will hide big files but still show small ones
# from my tests, big files are fairly safe to be parsed
# but the browser is the bottleneck
if not self.show_full_diff and exceeds_limit:
raise DiffLimitExceeded('File Limit Exceeded')
except DiffLimitExceeded:
diff_container = lambda _diff: \
LimitedDiffContainer(
self.diff_limit, self.cur_diff_size, _diff)
exceeds_limit = len(raw_diff) > self.file_limit
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 wont show for binary files
stats['ops'][BIN_FILENODE] = 'binary diff hidden'
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 = []
chunks.insert(0, [{
'old_lineno': '',
'new_lineno': '',
'action': Action.CONTEXT,
'line': msg,
} for _op, msg in stats['ops'].iteritems()
if _op not in [MOD_FILENODE]])
_files.append({
'filename': safe_unicode(head['b_path']),
'old_revision': head['a_blob_id'],
'new_revision': head['b_blob_id'],
'chunks': chunks,
'raw_diff': safe_unicode(raw_diff),
'operation': op,
'stats': stats,
'exceeds_limit': exceeds_limit,
'is_limited_diff': limited_diff,
})
sorter = lambda info: {OPS.ADD: 0, OPS.MOD: 1,
OPS.DEL: 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 (
Action.UNMODIFIED, Action.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 _check_large_diff(self):
log.debug('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('Diff Limit `%s` Exceeded', self.diff_limit)
# FIXME: NEWDIFFS: dan: this replaces _parse_gitdiff
def _new_parse_gitdiff(self, inline_diff=True):
_files = []
# this can be overriden later to a LimitedDiffContainer type
diff_container = lambda arg: arg
for chunk in self._diff.chunks():
head = chunk.header
log.debug('parsing diff %r' % head)
raw_diff = chunk.raw
limited_diff = False
exceeds_limit = False
op = None
stats = {
'added': 0,
'deleted': 0,
'binary': False,
'old_mode': None,
'new_mode': None,
'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'] = None
stats['new_mode'] = head['new_file_mode']
stats['ops'][NEW_FILENODE] = 'new file %s' % 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] = (
'modified file chmod %s => %s' % (
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] = (
'file renamed from %s to %s' % (
head['rename_from'], 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] = (
'file copied from %s to %s' % (
head['copy_from'], 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']:
diff = iter(chunk.diff.splitlines(1))
# 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',
safe_unicode(head['b_path']), self.file_limit)
raise DiffLimitExceeded(
'File Limit %s Exceeded', self.file_limit)
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:
diff_container = lambda _diff: \
LimitedDiffContainer(
self.diff_limit, self.cur_diff_size, _diff)
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 wont 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 = []
chunks.insert(
0, [{'old_lineno': '',
'new_lineno': '',
'action': Action.CONTEXT,
'line': msg,
} for _op, msg in stats['ops'].iteritems()
if _op not in [MOD_FILENODE]])
original_filename = safe_unicode(head['a_path'])
_files.append({
'original_filename': original_filename,
'filename': safe_unicode(head['b_path']),
'old_revision': head['a_blob_id'],
'new_revision': head['b_blob_id'],
'chunks': chunks,
'raw_diff': safe_unicode(raw_diff),
'operation': op,
'stats': stats,
'exceeds_limit': exceeds_limit,
'is_limited_diff': limited_diff,
})
sorter = lambda info: {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):
"""
Parse the diff an return data for the template.
"""
lineiter = iter(diff)
stats = [0, 0]
chunks = []
raw_diff = []
try:
line = lineiter.next()
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 = 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 = 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 '',
'new_lineno': affects_new and new_line or '',
'action': action,
'line': self._clean_line(line, command)
})
raw_diff.append(line)
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': 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 = []
diff_iter = imap(lambda s: safe_unicode(s), diff_iter)
try:
line = diff_iter.next()
while line:
raw_diff.append(line)
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
context = len(gr) == 5
old_end += old_line
new_end += new_line
line = diff_iter.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 = 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 '',
'new_lineno': affects_new and new_line or '',
'action': action,
'line': self._clean_line(line, command)
})
raw_diff.append(line)
line = diff_iter.next()
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 ''.join(raw_diff), 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.
: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
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" class="tooltip"
title="%(title)s">%(label)s</a>''' % {
'title': _('Click to select line'),
'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
if change['action'] != Action.CONTEXT:
anchor_link = True
else:
anchor_link = False
###########################################################
# COMMENT ICONS
###########################################################
_html.append('''\t<td class="add-comment-line"><span class="add-comment-content">''')
if enable_comments and change['action'] != Action.CONTEXT:
_html.append('''<a href="#"><span class="icon-comment-add"></span></a>''')
_html.append('''</span></td><td class="comment-toggle tooltip" title="Toggle Comment Thread"><i class="icon-comment"></i></td>\n''')
###########################################################
# 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(anchor_link, 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(anchor_link, change['new_lineno'],
'#%s' % anchor_new)
})
_html.append('''</td>\n''')
###########################################################
# CODE
###########################################################
code_classes = [code_class]
if (not enable_comments or
change['action'] == Action.CONTEXT):
code_classes.append('no-comment')
_html.append('\t<td class="%s">' % ' '.join(code_classes))
_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
def get_context_of_line(
self, path, diff_line=None, context_before=3, context_after=3):
"""
Returns the context lines for the specified diff line.
:type diff_line: :class:`DiffLineNumber`
"""
assert self.parsed, "DiffProcessor is not initialized."
if None not in diff_line:
raise ValueError(
"Cannot specify both line numbers: {}".format(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[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('\n') + '\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']:
context_iter = iter(context)
for line_idx, line in enumerate(chunk):
try:
if _context_line(line) == context_iter.next():
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:
context_iter.next()
except StopIteration:
matches.append((line_idx, chunk))
effective_offset = len(context) - offset
found_at_diff_lines = [
_line_to_diff_line_number(chunk[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("File {} not in diff".format(path))
return file_diff
def _find_chunk_line_index(self, file_diff, diff_line):
for chunk in file_diff['chunks']:
for idx, line in enumerate(chunk):
if line['old_lineno'] == diff_line.old:
return chunk, idx
if line['new_lineno'] == diff_line.new:
return chunk, idx
raise LineNotInDiffException(
"The line {} is not part of the diff.".format(diff_line))
def _is_diff_content(line):
return line['action'] in (
Action.UNMODIFIED, Action.ADD, Action.DELETE)
def _context_line(line):
return (line['action'], line['line'])
DiffLineNumber = collections.namedtuple('DiffLineNumber', ['old', 'new'])
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