def __add__(self, other):
"""
Adds another diff to this one. Will throw an exception if this is not
possible. (This will *not* be done in place.)
"""
if not isinstance(other, Diff):
raise TypeError('Only diffs can be added to a diff.')
if self.rename != other.rename and False not in (self.rename,
other.rename):
raise ConflictError('Diffs contain conflicting renamings.')
result = copy.deepcopy(self)
result.rename = self.rename or other.rename
result.delete = self.delete or other.delete
for line_nr in other._changes:
change = other._changes[line_nr]
if change.delete is True:
result.delete_line(line_nr)
if change.add_after is not False:
result.add_lines(line_nr, change.add_after)
if change.change is not False:
result.change_line(line_nr, change.change[0], change.change[1])
return result
def change_line(self, line_nr, original_line, replacement):
"""
Changes the given line with the given line number. The replacement will
be there instead.
"""
linediff = self._get_change(line_nr)
if linediff.change is not False and linediff.change[1] != replacement:
raise ConflictError("An already changed line cannot be changed.")
linediff.change = (original_line, replacement)
self._changes[line_nr] = linediff
def change_line(self, line_nr, original_line, replacement):
r"""
Changes the given line with the given line number. The replacement will
be there instead.
Given an empty diff object:
>>> diff = Diff(['Hey there! Gorgeous.\n',
... "It's nice that we're here.\n"])
We can change a line easily:
>>> diff.change_line(1,
... 'Hey there! Gorgeous.\n',
... 'Hey there! This is sad.\n')
>>> diff.modified
['Hey there! This is sad.\n', "It's nice that we're here.\n"]
We can even merge changes within one line:
>>> diff.change_line(1,
... 'Hey there! Gorgeous.\n',
... 'Hello. :( Gorgeous.\n')
>>> diff.modified
['Hello. :( This is sad.\n', "It's nice that we're here.\n"]
However, if we change something that has been changed before, we'll get
a conflict:
>>> diff.change_line(1, # +ELLIPSIS
... 'Hey there! Gorgeous.\n',
... 'Hello. This is not ok. Gorgeous.\n')
Traceback (most recent call last):
...
coalib.results.LineDiff.ConflictError: ...
"""
linediff = self._get_change(line_nr)
if linediff.change is not False and linediff.change[1] != replacement:
if len(replacement) == len(linediff.change[1]) == 1:
raise ConflictError('Cannot merge the given line changes.')
orig_diff = Diff.from_string_arrays(linediff.change[0],
linediff.change[1])
new_diff = Diff.from_string_arrays(linediff.change[0],
replacement)
replacement = ''.join((orig_diff + new_diff).modified)
linediff.change = (original_line, replacement)
self._changes[line_nr] = linediff
def add_lines(self, line_nr_before, lines):
"""
Adds lines after the given line number.
:param line_nr_before: Line number of the line before the additions.
Use 0 for insert lines before everything.
:param lines: A list of lines to add.
"""
if lines == []:
return # No action
linediff = self._get_change(line_nr_before, min_line=0)
if linediff.add_after is not False:
raise ConflictError('Cannot add lines after the given line since '
'there are already lines.')
linediff.add_after = lines
self._changes[line_nr_before] = linediff
