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# -*- coding: utf-8 -*-
# original copyright: 2007-2008 by Armin Ronacher
# licensed under the BSD license.
import re
import difflib
import logging
from difflib import unified_diff
from itertools import tee, imap
from mercurial.match import match
from rhodecode.lib.vcs.exceptions import VCSError
from rhodecode.lib.vcs.nodes import FileNode, NodeError
from rhodecode.lib.vcs.utils import safe_unicode
def get_udiff(filenode_old, filenode_new, show_whitespace=True):
"""
Returns unified diff between given ``filenode_old`` and ``filenode_new``.
"""
try:
filenode_old_date = filenode_old.changeset.date
except NodeError:
filenode_old_date = None
try:
filenode_new_date = filenode_new.changeset.date
except NodeError:
filenode_new_date = None
for filenode in (filenode_old, filenode_new):
if not isinstance(filenode, FileNode):
raise VCSError("Given object should be FileNode object, not %s"
% filenode.__class__)
if filenode_old_date and filenode_new_date:
if not filenode_old_date < filenode_new_date:
logging.debug("Generating udiff for filenodes with not increasing "
"dates")
vcs_udiff = unified_diff(filenode_old.content.splitlines(True),
filenode_new.content.splitlines(True),
filenode_old.name,
filenode_new.name,
filenode_old_date,
filenode_old_date)
return vcs_udiff
def get_gitdiff(filenode_old, filenode_new, ignore_whitespace=True):
"""
Returns git style diff between given ``filenode_old`` and ``filenode_new``.
:param ignore_whitespace: ignore whitespaces in diff
"""
for filenode in (filenode_old, filenode_new):
if not isinstance(filenode, FileNode):
raise VCSError("Given object should be FileNode object, not %s"
% filenode.__class__)
old_raw_id = getattr(filenode_old.changeset, 'raw_id', '0' * 40)
new_raw_id = getattr(filenode_new.changeset, 'raw_id', '0' * 40)
repo = filenode_new.changeset.repository
vcs_gitdiff = repo._get_diff(old_raw_id, new_raw_id, filenode_new.path,
ignore_whitespace)
return vcs_gitdiff
class DiffProcessor(object):
"""
Give it a unified 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.
"""
_chunk_re = re.compile(r'@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)')
def __init__(self, diff, differ='diff', format='udiff'):
"""
:param diff: a text in diff format or generator
:param format: format of diff passed, `udiff` or `gitdiff`
"""
if isinstance(diff, basestring):
diff = [diff]
self.__udiff = diff
self.__format = format
self.adds = 0
self.removes = 0
if isinstance(self.__udiff, basestring):
self.lines = iter(self.__udiff.splitlines(1))
elif self.__format == 'gitdiff':
udiff_copy = self.copy_iterator()
self.lines = imap(self.escaper, self._parse_gitdiff(udiff_copy))
else:
udiff_copy = self.copy_iterator()
self.lines = imap(self.escaper, udiff_copy)
# Select a differ.
if differ == 'difflib':
self.differ = self._highlight_line_difflib
else:
self.differ = self._highlight_line_udiff
def escaper(self, string):
return string.replace('<', '<').replace('>', '>')
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 _extract_rev(self, line1, line2):
"""
Extract the filename and revision hint from a line.
"""
try:
if line1.startswith('--- ') and line2.startswith('+++ '):
l1 = line1[4:].split(None, 1)
old_filename = l1[0].lstrip('a/') if len(l1) >= 1 else None
old_rev = l1[1] if len(l1) == 2 else 'old'
l2 = line2[4:].split(None, 1)
new_filename = l2[0].lstrip('b/') if len(l1) >= 1 else None
new_rev = l2[1] if len(l2) == 2 else 'new'
filename = old_filename if (old_filename !=
'dev/null') else new_filename
return filename, new_rev, old_rev
except (ValueError, IndexError):
pass
return None, None, None
def _parse_gitdiff(self, diffiterator):
def line_decoder(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)
output = list(diffiterator)
size = len(output)
if size == 2:
l = []
l.extend([output[0]])
l.extend(output[1].splitlines(1))
return map(line_decoder, l)
elif size == 1:
return map(line_decoder, output[0].splitlines(1))
elif size == 0:
return []
raise Exception('wrong size of diff %s' % size)
def _highlight_line_difflib(self, line, next):
"""
Highlight inline changes in both lines.
"""
if line['action'] == 'del':
old, new = line, next
else:
old, new = next, line
oldwords = re.split(r'(\W)', old['line'])
newwords = re.split(r'(\W)', 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'] == '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 _parse_udiff(self):
"""
Parse the diff an return data for the template.
"""
lineiter = self.lines
files = []
try:
line = lineiter.next()
# skip first context
skipfirst = True
while 1:
# continue until we found the old file
if not line.startswith('--- '):
line = lineiter.next()
continue
chunks = []
filename, old_rev, new_rev = \
self._extract_rev(line, lineiter.next())
files.append({
'filename': filename,
'old_revision': old_rev,
'new_revision': new_rev,
'chunks': chunks
})
line = lineiter.next()
while line:
match = self._chunk_re.match(line)
if not match:
break
lines = []
chunks.append(lines)
old_line, old_end, new_line, new_end = \
[int(x or 1) for x in match.groups()[:-1]]
old_line -= 1
new_line -= 1
context = len(match.groups()) == 5
old_end += old_line
new_end += new_line
if context:
if not skipfirst:
lines.append({
'old_lineno': '...',
'new_lineno': '...',
'action': 'context',
'line': line,
})
else:
skipfirst = False
line = lineiter.next()
while old_line < old_end or new_line < new_end:
if line:
command, line = line[0], line[1:]
else:
command = ' '
affects_old = affects_new = False
# ignore those if we don't expect them
if command in '#@':
continue
elif command == '+':
affects_new = True
action = 'add'
elif command == '-':
affects_old = True
action = 'del'
else:
affects_old = affects_new = True
action = 'unmod'
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': line
})
line = lineiter.next()
except StopIteration:
pass
# highlight inline changes
for file in files:
for chunk in chunks:
lineiter = iter(chunk)
#first = True
try:
while 1:
line = lineiter.next()
if line['action'] != 'unmod':
nextline = lineiter.next()
if nextline['action'] == 'unmod' or \
nextline['action'] == line['action']:
continue
self.differ(line, nextline)
except StopIteration:
pass
return files
def prepare(self):
"""
Prepare the passed udiff for HTML rendering. It'l return a list
of dicts
"""
return self._parse_udiff()
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 raw_diff(self):
"""
Returns raw string as udiff
"""
udiff_copy = self.copy_iterator()
if self.__format == 'gitdiff':
udiff_copy = self._parse_gitdiff(udiff_copy)
return u''.join(udiff_copy)
def as_html(self, table_class='code-difftable', line_class='line',
new_lineno_class='lineno old', old_lineno_class='lineno new',
code_class='code'):
"""
Return udiff 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
diff_lines = self.prepare()
_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="%(line_class)s %(action)s">\n''' \
% {'line_class': 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="%(old_lineno_cls)s">''' \
% {'a_id': anchor_old_id,
'old_lineno_cls': old_lineno_class})
_html.append('''<pre>%(link)s</pre>''' \
% {'link':
_link_to_if(cond_old, change['old_lineno'], '#%s' \
% anchor_old)})
_html.append('''</td>\n''')
###########################################################
# NEW LINE NUMBER
###########################################################
_html.append('''\t<td %(a_id)s class="%(new_lineno_cls)s">''' \
% {'a_id': anchor_new_id,
'new_lineno_cls': new_lineno_class})
_html.append('''<pre>%(link)s</pre>''' \
% {'link':
_link_to_if(cond_new, change['new_lineno'], '#%s' \
% anchor_new)})
_html.append('''</td>\n''')
###########################################################
# CODE
###########################################################
_html.append('''\t<td class="%(code_class)s">''' \
% {'code_class': code_class})
_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 adde,and removed lines for this instance
"""
return self.adds, self.removes
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