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More work on appy.shared.diff...

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This commit is contained in:
Gaetan Delannay 2011-11-18 01:01:50 +01:00
parent 2ec05939fe
commit cf992843ff
1 changed files with 63 additions and 29 deletions
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92
shared/diff.py
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@ -87,6 +87,16 @@ class Merger:
# Get the overlapping (new) diff. # Get the overlapping (new) diff.
newDiff, newDiffStart, isPrevious = self.getNextDiff() newDiff, newDiffStart, isPrevious = self.getNextDiff()
if not newDiff: if not newDiff:
# No more new diff. So normally, we should find what remains in
# oldText at self.lineB[self.i:]
if not self.lineB[self.i:].startswith(oldText):
# Anormal additional char. Probably a space? Indeed,
# word-level comparisons imply split(' ') which can be
# error-prone.
res += self.lineB[self.i]
self.i += 1
if not self.lineB[self.i:].startswith(oldText):
raise 'Error!!!!'
res += self.differ.getModifiedChunk(oldText, 'insert', '', res += self.differ.getModifiedChunk(oldText, 'insert', '',
msg=oldDiff.group(2)) msg=oldDiff.group(2))
self.i += len(oldText) self.i += len(oldText)
@ -118,6 +128,9 @@ class Merger:
def merge(self): def merge(self):
'''Merges self.previousDiffs into self.lineB.''' '''Merges self.previousDiffs into self.lineB.'''
res = '' res = ''
print 'MERGE'
print 'Line A', self.lineA
print 'Line B', self.lineB
diff, diffStart, isPrevious = self.getNextDiff() diff, diffStart, isPrevious = self.getNextDiff()
while diff: while diff:
# Dump the part of lineB between self.i and diffStart # Dump the part of lineB between self.i and diffStart
@ -136,6 +149,8 @@ class Merger:
overlap = self.manageOverlap(diff) overlap = self.manageOverlap(diff)
res += overlap res += overlap
elif diff.group(1) == 'delete':
res += diff.group(0)
else: else:
# Dump the diff and update self.i # Dump the diff and update self.i
res += diff.group(0) res += diff.group(0)
@ -208,7 +223,7 @@ class HtmlDiff:
# Will the surrouding tag be a div or a span? # Will the surrouding tag be a div or a span?
if sep == '\n': tag = 'div' if sep == '\n': tag = 'div'
else: tag = 'span' else: tag = 'span'
# What message wiill it show in its 'title' attribute? # What message will it show in its 'title' attribute?
if not msg: if not msg:
exec 'msg = self.%sMsg' % type exec 'msg = self.%sMsg' % type
# What CSS class (or, if none, tag-specific style) will be used ? # What CSS class (or, if none, tag-specific style) will be used ?
@ -221,10 +236,11 @@ class HtmlDiff:
# the 'name' attribute of the tag indicates the type of the update. # the 'name' attribute of the tag indicates the type of the update.
exec 'tagName = self.%sName' % type exec 'tagName = self.%sName' % type
# The idea is: if there are several lines, every line must be surrounded # The idea is: if there are several lines, every line must be surrounded
# by a tag. this way, we know that a surrounding tag can't span several # by a tag. This way, we know that a surrounding tag can't span several
# lines, which is a prerequisite for managing cumulative diffs. # lines, which is a prerequisite for managing cumulative diffs.
if sep == ' ': if sep == ' ':
seq = sep.join(seq) if not isinstance(seq, basestring):
seq = sep.join(seq)
sep = '' sep = ''
if isinstance(seq, basestring): if isinstance(seq, basestring):
return '%s<%s name="%s" %s title="%s">%s</%s>%s' % \ return '%s<%s name="%s" %s title="%s">%s</%s>%s' % \
@ -307,7 +323,7 @@ class HtmlDiff:
# Wrap content info reified tag # Wrap content info reified tag
return startTag + content + endTag return startTag + content + endTag
def getSeqDiff(self, seqA, seqB): def getSeqDiff(self, seqA, seqB, sep):
'''p_seqA and p_seqB are lists of strings. Here we will try to identify '''p_seqA and p_seqB are lists of strings. Here we will try to identify
similarities between strings from p_seqA and p_seqB, and return a similarities between strings from p_seqA and p_seqB, and return a
list of differences between p_seqA and p_seqB, where each element list of differences between p_seqA and p_seqB, where each element
@ -369,7 +385,17 @@ class HtmlDiff:
# Consider any "unconsumed" line from p_seqB as being inserted. # Consider any "unconsumed" line from p_seqB as being inserted.
if k < len(seqB): if k < len(seqB):
for line in seqB[k:]: res.append( ('insert', line) ) for line in seqB[k:]: res.append( ('insert', line) )
return res # Merge similar diffs, excepted if separator is a carriage return
if sep == '\n': return res
newRes = []
lastType = None
for type, data in res:
if lastType and (type != 'replace') and (lastType == type):
newRes[-1] = (type, newRes[-1][1] + sep + data)
else:
newRes.append( (type, data) )
lastType = type
return newRes
def split(self, s, sep): def split(self, s, sep):
'''Splits string p_s with p_sep. If p_sep is a space, the split can't '''Splits string p_s with p_sep. If p_sep is a space, the split can't
@ -395,7 +421,8 @@ class HtmlDiff:
i -= 1 i -= 1
return l return l
def getLineReplacement(self, lineA, lineB, previousDiffsA, outerTagA): nextSeps = {'\n': ' ', ' ': ''}
def getReplacement(self, sep, lineA, lineB, previousDiffsA, outerTagA):
'''p_lineA has been replaced with p_lineB. Here, we will investigate '''p_lineA has been replaced with p_lineB. Here, we will investigate
further here and explore differences at the *word* level between further here and explore differences at the *word* level between
p_lineA and p_lineB. p_lineA and p_lineB.
@ -414,8 +441,8 @@ class HtmlDiff:
contentA = matchA and matchA.group(3) or lineA contentA = matchA and matchA.group(3) or lineA
matchB = htmlTag.match(lineB) matchB = htmlTag.match(lineB)
contentB = matchB and matchB.group(3) or lineB contentB = matchB and matchB.group(3) or lineB
# Perform the diff at the level fo words # Perform the diff at the level of words
diff = self.getHtmlDiff(contentA, contentB, ' ') diff = self.getHtmlDiff(contentA, contentB, self.nextSeps[sep])
if matchB: if matchB:
res = self.computeTag(matchB, diff) res = self.computeTag(matchB, diff)
else: else:
@ -441,10 +468,14 @@ class HtmlDiff:
similar in a previous call to m_getHtmlDiff with sep=carriage similar in a previous call to m_getHtmlDiff with sep=carriage
return.''' return.'''
res = [] res = []
a = self.split(old, sep) if sep:
b = self.split(new, sep) a = self.split(old, sep)
b = self.split(new, sep)
else:
a = old
b = new
matcher = difflib.SequenceMatcher() matcher = difflib.SequenceMatcher()
matcher.set_seqs(a,b) matcher.set_seqs(a, b)
for action, i1, i2, j1, j2 in matcher.get_opcodes(): for action, i1, i2, j1, j2 in matcher.get_opcodes():
chunkA = self.removeGarbage(a[i1:i2]) chunkA = self.removeGarbage(a[i1:i2])
chunkB = self.removeGarbage(b[j1:j2]) chunkB = self.removeGarbage(b[j1:j2])
@ -467,24 +498,27 @@ class HtmlDiff:
# Was a deletion, not a replacement # Was a deletion, not a replacement
toAdd = self.getModifiedChunk(chunkA, 'delete', sep) toAdd = self.getModifiedChunk(chunkA, 'delete', sep)
else: # At least, a true replacement else: # At least, a true replacement
if sep == '\n': toAdd = []
toAdd = [] # We know that some lines/words have been replaced from a to
# We know that some lines have been replaced from a to # b. By identifying similarities between those lines/words,
# b. By identifying similarities between those lines, # consider some as having been deleted, modified or
# consider some as having been deleted, modified or # inserted.
# inserted. for sAction, line in self.getSeqDiff(chunkA, chunkB, sep):
for sAction, line in self.getSeqDiff(chunkA, chunkB): if sAction in ('insert', 'delete'):
if sAction in ('insert', 'delete'): mChunk = self.getModifiedChunk(line, sAction, sep)
mChunk = self.getModifiedChunk(line,sAction,sep) toAdd.append(mChunk)
toAdd.append(mChunk) elif sAction == 'equal':
elif sAction == 'equal': toAdd.append(line)
toAdd.append(line) elif sAction == 'replace':
elif sAction == 'replace': toAdd.append(self.getReplacement(sep, *line))
toAdd.append(self.getLineReplacement(*line)) # The following line, when sep is the space (=when workin
toAdd = sep.join(toAdd) # on diffs at the word level), leads to additional spaces
else: # being dumped into the result (ie, a space between a delete
toAdd = self.getModifiedChunk(chunkA, 'delete', sep) # and an insert, which was not in the initial text). We
toAdd += self.getModifiedChunk(chunkB, 'insert', sep) # could not find a way to avoid inserting those spaces. So
# when merging diffs (see Merger.merge), we know that a
# 'space' error can occur and we take it into account then.
toAdd = sep.join(toAdd)
if toAdd: res.append(toAdd) if toAdd: res.append(toAdd)
return sep.join(res) return sep.join(res)