def _parse_hunk(diff, source_start, source_len, target_start, target_len):
hunk = Hunk(source_start, source_len, target_start, target_len)
modified = 0
deleting = 0
for line in diff:
valid_line = RE_HUNK_BODY_LINE.match(line)
if valid_line:
action = valid_line.group(0)
original_line = line[1:]
if action == '+':
hunk.append_added_line(original_line)
# modified lines == deleted immediately followed by added
if deleting > 0:
modified += 1
deleting -= 1
elif action == '-':
hunk.append_deleted_line(original_line)
deleting += 1
elif action == ' ':
hunk.append_context_line(original_line)
hunk.add_to_modified_counter(modified)
# reset modified auxiliar variables
deleting = 0
modified = 0
else:
raise UnidiffParseException('Hunk diff data expected')
# check hunk len(old_lines) and len(new_lines) are ok
if hunk.is_valid():
break
return hunk
