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from difflib import SequenceMatcher
class MultiParent(object):
def __init__(self, hunks=None):
if hunks is not None:
self.hunks = hunks
else:
self.hunks = []
def __repr__(self):
return "MultiParent(%r)" % self.hunks
def __eq__(self, other):
if self.__class__ is not other.__class__:
return False
return (self.hunks == other.hunks)
@staticmethod
def from_lines(text, parents=()):
def compare(parent):
return SequenceMatcher(None, parent, text).get_matching_blocks()
parent_comparisons = [compare(p) for p in parents]
cur_line = 0
new_text = NewText([])
parent_text = []
block_iter = [iter(i) for i in parent_comparisons]
diff = MultiParent([])
def next_block(p):
try:
return block_iter[p].next()
except StopIteration:
return None
cur_block = [next_block(p) for p, i in enumerate(block_iter)]
while cur_line < len(text):
best_match = None
for p, block in enumerate(cur_block):
if block is None:
continue
i, j, n = block
while j + n < cur_line:
block = cur_block[p] = next_block(p)
if block is None:
break
i, j, n = block
if block is None:
continue
if j > cur_line:
continue
offset = cur_line - j
i += offset
j = cur_line
n -= offset
if n == 0:
continue
if best_match is None or n > best_match.num_lines:
best_match = ParentText(p, i, j, n)
if best_match is None:
new_text.lines.append(text[cur_line])
cur_line += 1
else:
if len(new_text.lines) > 0:
diff.hunks.append(new_text)
new_text = NewText([])
diff.hunks.append(best_match)
cur_line += best_match.num_lines
if len(new_text.lines) > 0:
diff.hunks.append(new_text)
return diff
@classmethod
def from_texts(cls, text, parents=()):
return cls.from_lines(text.splitlines(True),
[p.splitlines(True) for p in parents])
def to_patch(self):
for hunk in self.hunks:
for line in hunk.to_patch():
yield line
class NewText(object):
def __init__(self, lines):
self.lines = lines
def __eq__(self, other):
if self.__class__ is not other.__class__:
return False
return (other.lines == self.lines)
def __repr__(self):
return 'NewText(%r)' % self.lines
def to_patch(self):
yield 'i %d\n' % len(self.lines)
for line in self.lines:
yield line
yield '\n'
class ParentText(object):
def __init__(self, parent, parent_pos, child_pos, num_lines):
self.parent = parent
self.parent_pos = parent_pos
self.child_pos = child_pos
self.num_lines = num_lines
def __repr__(self):
return 'ParentText(%(parent)r, %(parent_pos)r, %(child_pos)r,'\
' %(num_lines)r)' % self.__dict__
def __eq__(self, other):
if self.__class__ != other.__class__:
return False
return (self.__dict__ == other.__dict__)
def to_patch(self):
yield 'c %(parent)d %(parent_pos)d %(child_pos)d %(num_lines)d\n'\
% self.__dict__
class MultiVersionedFile(object):
def __init__(self):
self._diffs = {}
self._lines = {}
self._parents = {}
def add_version(self, lines, version_id, parent_ids):
parent_lines = [self._lines[p] for p in parent_ids]
diff = MultiParent.from_lines(lines, parent_lines)
self.add_diff(diff, version_id, parent_ids)
self._lines[version_id] = lines
def add_diff(self, diff, version_id, parent_ids):
self._diffs[version_id] = diff
self._parents[version_id] = parent_ids
def clear_cache(self):
self._lines.clear()
pass
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