175
181
elif len(parents_lines) == 2:
176
182
left = _reannotate(parents_lines[0], new_lines, new_revision_id,
177
183
_left_matching_blocks)
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right = _reannotate(parents_lines[1], new_lines, new_revision_id)
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for idx in xrange(len(new_lines)):
181
if left[idx][0] == right[idx][0]:
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# The annotations match, just return the left one
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lines.append(left[idx])
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elif left[idx][0] == new_revision_id:
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# The left parent claims a new value, return the right one
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lines.append(right[idx])
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elif right[idx][0] == new_revision_id:
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# The right parent claims a new value, return the left one
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lines.append(left[idx])
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# Both claim different origins
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lines.append((new_revision_id, left[idx][1]))
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lines = _reannotate_annotated(parents_lines[1], new_lines,
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new_revision_id, left,
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188
reannotations = [_reannotate(parents_lines[0], new_lines,
195
189
new_revision_id, _left_matching_blocks)]
227
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lines.extend(parent_lines[i:i+n])
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def _get_matching_blocks(old, new):
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matcher = patiencediff.PatienceSequenceMatcher(None,
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return matcher.get_matching_blocks()
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def _find_matching_unannotated_lines(output_lines, plain_child_lines,
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child_lines, start_child, end_child,
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right_lines, start_right, end_right,
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heads_provider, revision_id):
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"""Find lines in plain_right_lines that match the existing lines.
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:param output_lines: Append final annotated lines to this list
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:param plain_child_lines: The unannotated new lines for the child text
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:param child_lines: Lines for the child text which have been annotated
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:param start_child: Position in plain_child_lines and child_lines to start the
244
:param end_child: Last position in plain_child_lines and child_lines to search
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:param right_lines: The annotated lines for the whole text for the right
248
:param start_right: Position in right_lines to start the match
249
:param end_right: Last position in right_lines to search for a match
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:param heads_provider: When parents disagree on the lineage of a line, we
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need to check if one side supersedes the other
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:param revision_id: The label to give if a line should be labeled 'tip'
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output_extend = output_lines.extend
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output_append = output_lines.append
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# We need to see if any of the unannotated lines match
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plain_right_subset = [l for a,l in right_lines[start_right:end_right]]
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plain_child_subset = plain_child_lines[start_child:end_child]
259
match_blocks = _get_matching_blocks(plain_right_subset, plain_child_subset)
263
for right_idx, child_idx, match_len in match_blocks:
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# All the lines that don't match are just passed along
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if child_idx > last_child_idx:
266
output_extend(child_lines[start_child + last_child_idx
267
:start_child + child_idx])
268
for offset in xrange(match_len):
269
left = child_lines[start_child+child_idx+offset]
270
right = right_lines[start_right+right_idx+offset]
271
if left[0] == right[0]:
272
# The annotations match, just return the left one
274
elif left[0] == revision_id:
275
# The left parent marked this as unmatched, so let the
276
# right parent claim it
279
# Left and Right both claim this line
280
if heads_provider is None:
281
output_append((revision_id, left[1]))
283
heads = heads_provider.heads((left[0], right[0]))
285
output_append((iter(heads).next(), left[1]))
287
# Both claim different origins
288
output_append((revision_id, left[1]))
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# We know that revision_id is the head for
290
# left and right, so cache it
291
heads_provider.cache(
292
(revision_id, left[0]),
294
heads_provider.cache(
295
(revision_id, right[0]),
297
last_child_idx = child_idx + match_len
300
def _reannotate_annotated(right_parent_lines, new_lines, new_revision_id,
301
annotated_lines, heads_provider):
302
"""Update the annotations for a node based on another parent.
304
:param right_parent_lines: A list of annotated lines for the right-hand
306
:param new_lines: The unannotated new lines.
307
:param new_revision_id: The revision_id to attribute to lines which are not
308
present in either parent.
309
:param annotated_lines: A list of annotated lines. This should be the
310
annotation of new_lines based on parents seen so far.
311
:param heads_provider: When parents disagree on the lineage of a line, we
312
need to check if one side supersedes the other.
314
assert len(new_lines) == len(annotated_lines)
315
# First compare the newly annotated lines with the right annotated lines.
316
# Lines which were not changed in left or right should match. This tends to
317
# be the bulk of the lines, and they will need no further processing.
319
lines_extend = lines.extend
320
last_right_idx = 0 # The line just after the last match from the right side
322
matching_left_and_right = _get_matching_blocks(right_parent_lines,
324
for right_idx, left_idx, match_len in matching_left_and_right:
325
# annotated lines from last_left_idx to left_idx did not match the lines from
327
# to right_idx, the raw lines should be compared to determine what annotations
329
if last_right_idx == right_idx or last_left_idx == left_idx:
330
# One of the sides is empty, so this is a pure insertion
331
lines_extend(annotated_lines[last_left_idx:left_idx])
333
# We need to see if any of the unannotated lines match
334
_find_matching_unannotated_lines(lines,
335
new_lines, annotated_lines,
336
last_left_idx, left_idx,
338
last_right_idx, right_idx,
341
last_right_idx = right_idx + match_len
342
last_left_idx = left_idx + match_len
343
# If left and right agree on a range, just push that into the output
344
assert len(lines) == left_idx
345
lines_extend(annotated_lines[left_idx:left_idx + match_len])