[Python-checkins] python/dist/src/Lib difflib.py,1.22,1.23
loewis at users.sourceforge.net
loewis at users.sourceforge.net
Sun Aug 29 18:34:42 CEST 2004
Update of /cvsroot/python/python/dist/src/Lib
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv22983/Lib
Modified Files:
difflib.py
Log Message:
Patch #914575: difflib side by side diff support, diff.py s/b/s HTML option.
Index: difflib.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/difflib.py,v
retrieving revision 1.22
retrieving revision 1.23
diff -u -d -r1.22 -r1.23
--- difflib.py 31 Jul 2004 00:19:43 -0000 1.22
+++ difflib.py 29 Aug 2004 16:34:39 -0000 1.23
@@ -23,11 +23,14 @@
Class Differ:
For producing human-readable deltas from sequences of lines of text.
+
+Class HtmlDiff:
+ For producing HTML side by side comparison with change highlights.
"""
__all__ = ['get_close_matches', 'ndiff', 'restore', 'SequenceMatcher',
'Differ','IS_CHARACTER_JUNK', 'IS_LINE_JUNK', 'context_diff',
- 'unified_diff']
+ 'unified_diff', 'HtmlDiff']
import heapq
@@ -1101,8 +1104,6 @@
return ch in ws
-del re
-
def unified_diff(a, b, fromfile='', tofile='', fromfiledate='',
tofiledate='', n=3, lineterm='\n'):
@@ -1277,6 +1278,678 @@
"""
return Differ(linejunk, charjunk).compare(a, b)
+def _mdiff(fromlines, tolines, context=None, linejunk=None,
+ charjunk=IS_CHARACTER_JUNK):
+ """Returns generator yielding marked up from/to side by side differences.
+
+ Arguments:
+ fromlines -- list of text lines to compared to tolines
+ tolines -- list of text lines to be compared to fromlines
+ context -- number of context lines to display on each side of difference,
+ if None, all from/to text lines will be generated.
+ linejunk -- passed on to ndiff (see ndiff documentation)
+ charjunk -- passed on to ndiff (see ndiff documentation)
+
+ This function returns an interator which returns a tuple:
+ (from line tuple, to line tuple, boolean flag)
+
+ from/to line tuple -- (line num, line text)
+ line num -- integer or None (to indicate a context seperation)
+ line text -- original line text with following markers inserted:
+ '\0+' -- marks start of added text
+ '\0-' -- marks start of deleted text
+ '\0^' -- marks start of changed text
+ '\1' -- marks end of added/deleted/changed text
+
+ boolean flag -- None indicates context separation, True indicates
+ either "from" or "to" line contains a change, otherwise False.
+
+ This function/iterator was originally developed to generate side by side
+ file difference for making HTML pages (see HtmlDiff class for example
+ usage).
+
+ Note, this function utilizes the ndiff function to generate the side by
+ side difference markup. Optional ndiff arguments may be passed to this
+ function and they in turn will be passed to ndiff.
+ """
+ import re
+
+ # regular expression for finding intraline change indices
+ change_re = re.compile('(\++|\-+|\^+)')
+
+ # create the difference iterator to generate the differences
+ diff_lines_iterator = ndiff(fromlines,tolines,linejunk,charjunk)
+
+ def _make_line(lines, format_key, side, num_lines=[0,0]):
+ """Returns line of text with user's change markup and line formatting.
+
+ lines -- list of lines from the ndiff generator to produce a line of
+ text from. When producing the line of text to return, the
+ lines used are removed from this list.
+ format_key -- '+' return first line in list with "add" markup around
+ the entire line.
+ '-' return first line in list with "delete" markup around
+ the entire line.
+ '?' return first line in list with add/delete/change
+ intraline markup (indices obtained from second line)
+ None return first line in list with no markup
+ side -- indice into the num_lines list (0=from,1=to)
+ num_lines -- from/to current line number. This is NOT intended to be a
+ passed parameter. It is present as a keyword argument to
+ maintain memory of the current line numbers between calls
+ of this function.
+
+ Note, this function is purposefully not defined at the module scope so
+ that data it needs from its parent function (within whose context it
+ is defined) does not need to be of module scope.
+ """
+ num_lines[side] += 1
+ # Handle case where no user markup is to be added, just return line of
+ # text with user's line format to allow for usage of the line number.
+ if format_key is None:
+ return (num_lines[side],lines.pop(0)[2:])
+ # Handle case of intraline changes
+ if format_key == '?':
+ text, markers = lines.pop(0), lines.pop(0)
+ # find intraline changes (store change type and indices in tuples)
+ sub_info = []
+ def record_sub_info(match_object,sub_info=sub_info):
+ sub_info.append([match_object.group(1)[0],match_object.span()])
+ return match_object.group(1)
+ change_re.sub(record_sub_info,markers)
+ # process each tuple inserting our special marks that won't be
+ # noticed by an xml/html escaper.
+ for key,(begin,end) in sub_info[::-1]:
+ text = text[0:begin]+'\0'+key+text[begin:end]+'\1'+text[end:]
+ text = text[2:]
+ # Handle case of add/delete entire line
+ else:
+ text = lines.pop(0)[2:]
+ # if line of text is just a newline, insert a space so there is
+ # something for the user to highlight and see.
+ if len(text) <= 1:
+ text = ' '+text
+ # insert marks that won't be noticed by an xml/html escaper.
+ text = '\0' + format_key + text + '\1'
+ # Return line of text, first allow user's line formatter to do it's
+ # thing (such as adding the line number) then replace the special
+ # marks with what the user's change markup.
+ return (num_lines[side],text)
+
+ def _line_iterator():
+ """Yields from/to lines of text with a change indication.
+
+ This function is an iterator. It itself pulls lines from a
+ differencing iterator, processes them and yields them. When it can
+ it yields both a "from" and a "to" line, otherwise it will yield one
+ or the other. In addition to yielding the lines of from/to text, a
+ boolean flag is yielded to indicate if the text line(s) have
+ differences in them.
+
+ Note, this function is purposefully not defined at the module scope so
+ that data it needs from its parent function (within whose context it
+ is defined) does not need to be of module scope.
+ """
+ lines = []
+ num_blanks_pending, num_blanks_to_yield = 0, 0
+ while True:
+ # Load up next 4 lines so we can look ahead, create strings which
+ # are a concatenation of the first character of each of the 4 lines
+ # so we can do some very readable comparisons.
+ while len(lines) < 4:
+ try:
+ lines.append(diff_lines_iterator.next())
+ except StopIteration:
+ lines.append('X')
+ s = ''.join([line[0] for line in lines])
+ if s.startswith('X'):
+ # When no more lines, pump out any remaining blank lines so the
+ # corresponding add/delete lines get a matching blank line so
+ # all line pairs get yielded at the next level.
+ num_blanks_to_yield = num_blanks_pending
+ elif s.startswith('-?+?'):
+ # simple intraline change
+ yield _make_line(lines,'?',0), _make_line(lines,'?',1), True
+ continue
+ elif s.startswith('--++'):
+ # in delete block, add block coming: we do NOT want to get
+ # caught up on blank lines yet, just process the delete line
+ num_blanks_pending -= 1
+ yield _make_line(lines,'-',0), None, True
+ continue
+ elif s.startswith('--?+') or s.startswith('--+') or \
+ s.startswith('- '):
+ # in delete block and see a intraline change or unchanged line
+ # coming: yield the delete line and then blanks
+ from_line,to_line = _make_line(lines,'-',0), None
+ num_blanks_to_yield,num_blanks_pending = num_blanks_pending-1,0
+ elif s.startswith('-+?'):
+ # intraline change
+ yield _make_line(lines,None,0), _make_line(lines,'?',1), True
+ continue
+ elif s.startswith('-?+'):
+ # intraline change
+ yield _make_line(lines,'?',0), _make_line(lines,None,1), True
+ continue
+ elif s.startswith('-'):
+ # delete FROM line
+ num_blanks_pending -= 1
+ yield _make_line(lines,'-',0), None, True
+ continue
+ elif s.startswith('+--'):
+ # in add block, delete block coming: we do NOT want to get
+ # caught up on blank lines yet, just process the add line
+ num_blanks_pending += 1
+ yield None, _make_line(lines,'+',1), True
+ continue
+ elif s.startswith('+ ') or s.startswith('+-'):
+ # will be leaving an add block: yield blanks then add line
+ from_line, to_line = None, _make_line(lines,'+',1)
+ num_blanks_to_yield,num_blanks_pending = num_blanks_pending+1,0
+ elif s.startswith('+'):
+ # inside an add block, yield the add line
+ num_blanks_pending += 1
+ yield None, _make_line(lines,'+',1), True
+ continue
+ elif s.startswith(' '):
+ # unchanged text, yield it to both sides
+ yield _make_line(lines[:],None,0),_make_line(lines,None,1),False
+ continue
+ # Catch up on the blank lines so when we yield the next from/to
+ # pair, they are lined up.
+ while(num_blanks_to_yield < 0):
+ num_blanks_to_yield += 1
+ yield None,('','\n'),True
+ while(num_blanks_to_yield > 0):
+ num_blanks_to_yield -= 1
+ yield ('','\n'),None,True
+ if s.startswith('X'):
+ raise StopIteration
+ else:
+ yield from_line,to_line,True
+
+ def _line_pair_iterator():
+ """Yields from/to lines of text with a change indication.
+
+ This function is an iterator. It itself pulls lines from the line
+ iterator. It's difference from that iterator is that this function
+ always yields a pair of from/to text lines (with the change
+ indication). If necessary it will collect single from/to lines
+ until it has a matching pair from/to pair to yield.
+
+ Note, this function is purposefully not defined at the module scope so
+ that data it needs from its parent function (within whose context it
+ is defined) does not need to be of module scope.
+ """
+ line_iterator = _line_iterator()
+ fromlines,tolines=[],[]
+ while True:
+ # Collecting lines of text until we have a from/to pair
+ while (len(fromlines)==0 or len(tolines)==0):
+ from_line, to_line, found_diff =line_iterator.next()
+ if from_line is not None:
+ fromlines.append((from_line,found_diff))
+ if to_line is not None:
+ tolines.append((to_line,found_diff))
+ # Once we have a pair, remove them from the collection and yield it
+ from_line, fromDiff = fromlines.pop(0)
+ to_line, to_diff = tolines.pop(0)
+ yield (from_line,to_line,fromDiff or to_diff)
+
+ # Handle case where user does not want context differencing, just yield
+ # them up without doing anything else with them.
+ line_pair_iterator = _line_pair_iterator()
+ if context is None:
+ while True:
+ yield line_pair_iterator.next()
+ # Handle case where user wants context differencing. We must do some
+ # storage of lines until we know for sure that they are to be yielded.
+ else:
+ context += 1
+ lines_to_write = 0
+ while True:
+ # Store lines up until we find a difference, note use of a
+ # circular queue because we only need to keep around what
+ # we need for context.
+ index, contextLines = 0, [None]*(context)
+ found_diff = False
+ while(found_diff is False):
+ from_line, to_line, found_diff = line_pair_iterator.next()
+ i = index % context
+ contextLines[i] = (from_line, to_line, found_diff)
+ index += 1
+ # Yield lines that we have collected so far, but first yield
+ # the user's separator.
+ if index > context:
+ yield None, None, None
+ lines_to_write = context
+ else:
+ lines_to_write = index
+ index = 0
+ while(lines_to_write):
+ i = index % context
+ index += 1
+ yield contextLines[i]
+ lines_to_write -= 1
+ # Now yield the context lines after the change
+ lines_to_write = context-1
+ while(lines_to_write):
+ from_line, to_line, found_diff = line_pair_iterator.next()
+ # If another change within the context, extend the context
+ if found_diff:
+ lines_to_write = context-1
+ else:
+ lines_to_write -= 1
+ yield from_line, to_line, found_diff
+
+
+_file_template = """
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+
+<html>
+
+<head>
+ <meta http-equiv="Content-Type"
+ content="text/html; charset=ISO-8859-1" />
+ <title></title>
+ <style type="text/css">%(styles)s
+ </style>
+</head>
+
+<body>
+ %(table)s%(legend)s
+</body>
+
+</html>"""
+
+_styles = """
+ table.diff {font-family:Courier; border:medium;}
+ .diff_header {background-color:#e0e0e0}
+ td.diff_header {text-align:right}
+ .diff_next {background-color:#c0c0c0}
+ .diff_add {background-color:#aaffaa}
+ .diff_chg {background-color:#ffff77}
+ .diff_sub {background-color:#ffaaaa}"""
+
+_table_template = """
+ <table class="diff" id="difflib_chg_%(prefix)s_top"
+ cellspacing="0" cellpadding="0" rules="groups" >
+ <colgroup></colgroup> <colgroup></colgroup> <colgroup></colgroup>
+ <colgroup></colgroup> <colgroup></colgroup> <colgroup></colgroup>
+ %(header_row)s
+ <tbody>
+%(data_rows)s </tbody>
+ </table>"""
+
+_legend = """
+ <table class="diff" summary="Legends">
+ <tr> <th colspan="2"> Legends </th> </tr>
+ <tr> <td> <table border="" summary="Colors">
+ <tr><th> Colors </th> </tr>
+ <tr><td class="diff_add"> Added </td></tr>
+ <tr><td class="diff_chg">Changed</td> </tr>
+ <tr><td class="diff_sub">Deleted</td> </tr>
+ </table></td>
+ <td> <table border="" summary="Links">
+ <tr><th colspan="2"> Links </th> </tr>
+ <tr><td>(f)irst change</td> </tr>
+ <tr><td>(n)ext change</td> </tr>
+ <tr><td>(t)op</td> </tr>
+ </table></td> </tr>
+ </table>"""
+
+class HtmlDiff(object):
+ """For producing HTML side by side comparison with change highlights.
+
+ This class can be used to create an HTML table (or a complete HTML file
+ containing the table) showing a side by side, line by line comparision
+ of text with inter-line and intra-line change highlights. The table can
+ be generated in either full or contextual difference mode.
+
+ The following methods are provided for HTML generation:
+
+ make_table -- generates HTML for a single side by side table
+ make_file -- generates complete HTML file with a single side by side table
+
+ See tools/scripts/diff.py for an example usage of this class.
+ """
+
+ _file_template = _file_template
+ _styles = _styles
+ _table_template = _table_template
+ _legend = _legend
+ _default_prefix = 0
+
+ def __init__(self,tabsize=8,wrapcolumn=None,linejunk=None,
+ charjunk=IS_CHARACTER_JUNK):
+ """HtmlDiff instance initializer
+
+ Arguments:
+ tabsize -- tab stop spacing, defaults to 8.
+ wrapcolumn -- column number where lines are broken and wrapped,
+ defaults to None where lines are not wrapped.
+ linejunk,charjunk -- keyword arguments passed into ndiff() (used to by
+ HtmlDiff() to generate the side by side HTML differences). See
+ ndiff() documentation for argument default values and descriptions.
+ """
+ self._tabsize = tabsize
+ self._wrapcolumn = wrapcolumn
+ self._linejunk = linejunk
+ self._charjunk = charjunk
+
+ def make_file(self,fromlines,tolines,fromdesc='',todesc='',context=False,
+ numlines=5):
+ """Returns HTML file of side by side comparison with change highlights
+
+ Arguments:
+ fromlines -- list of "from" lines
+ tolines -- list of "to" lines
+ fromdesc -- "from" file column header string
+ todesc -- "to" file column header string
+ context -- set to True for contextual differences (defaults to False
+ which shows full differences).
+ numlines -- number of context lines. When context is set True,
+ controls number of lines displayed before and after the change.
+ When context is False, controls the number of lines to place
+ the "next" link anchors before the next change (so click of
+ "next" link jumps to just before the change).
+ """
+
+ return self._file_template % dict(
+ styles = self._styles,
+ legend = self._legend,
+ table = self.make_table(fromlines,tolines,fromdesc,todesc,
+ context=context,numlines=numlines))
+
+ def _tab_newline_replace(self,fromlines,tolines):
+ """Returns from/to line lists with tabs expanded and newlines removed.
+
+ Instead of tab characters being replaced by the number of spaces
+ needed to fill in to the next tab stop, this function will fill
+ the space with tab characters. This is done so that the difference
+ algorithms can identify changes in a file when tabs are replaced by
+ spaces and vice versa. At the end of the HTML generation, the tab
+ characters will be replaced with a nonbreakable space.
+ """
+ def expand_tabs(line):
+ # hide real spaces
+ line = line.replace(' ','\0')
+ # expand tabs into spaces
+ line = line.expandtabs(self._tabsize)
+ # relace spaces from expanded tabs back into tab characters
+ # (we'll replace them with markup after we do differencing)
+ line = line.replace(' ','\t')
+ return line.replace('\0',' ').rstrip('\n')
+ fromlines = [expand_tabs(line) for line in fromlines]
+ tolines = [expand_tabs(line) for line in tolines]
+ return fromlines,tolines
+
+ def _split_line(self,data_list,line_num,text):
+ """Builds list of text lines by splitting text lines at wrap point
+
+ This function will determine if the input text line needs to be
+ wrapped (split) into separate lines. If so, the first wrap point
+ will be determined and the first line appended to the output
+ text line list. This function is used recursively to handle
+ the second part of the split line to further split it.
+ """
+ # if blank line or context separator, just add it to the output list
+ if not line_num:
+ data_list.append((line_num,text))
+ return
+
+ # if line text doesn't need wrapping, just add it to the output list
+ size = len(text)
+ max = self._wrapcolumn
+ if (size <= max) or ((size -(text.count('\0')*3)) <= max):
+ data_list.append((line_num,text))
+ return
+
+ # scan text looking for the wrap point, keeping track if the wrap
+ # point is inside markers
+ i = 0
+ n = 0
+ mark = ''
+ while n < max and i < size:
+ if text[i] == '\0':
+ i += 1
+ mark = text[i]
+ i += 1
+ elif text[i] == '\1':
+ i += 1
+ mark = ''
+ else:
+ i += 1
+ n += 1
+
+ # wrap point is inside text, break it up into separate lines
+ line1 = text[:i]
+ line2 = text[i:]
+
+ # if wrap point is inside markers, place end marker at end of first
+ # line and start marker at beginning of second line because each
+ # line will have its own table tag markup around it.
+ if mark:
+ line1 = line1 + '\1'
+ line2 = '\0' + mark + line2
+
+ # tack on first line onto the output list
+ data_list.append((line_num,line1))
+
+ # use this routine again to wrap the remaining text
+ self._split_line(data_list,'>',line2)
+
+ def _line_wrapper(self,diffs):
+ """Returns iterator that splits (wraps) mdiff text lines"""
+
+ # pull from/to data and flags from mdiff iterator
+ for fromdata,todata,flag in diffs:
+ # check for context separators and pass them through
+ if flag is None:
+ yield fromdata,todata,flag
+ continue
+ (fromline,fromtext),(toline,totext) = fromdata,todata
+ # for each from/to line split it at the wrap column to form
+ # list of text lines.
+ fromlist,tolist = [],[]
+ self._split_line(fromlist,fromline,fromtext)
+ self._split_line(tolist,toline,totext)
+ # yield from/to line in pairs inserting blank lines as
+ # necessary when one side has more wrapped lines
+ while fromlist or tolist:
+ if fromlist:
+ fromdata = fromlist.pop(0)
+ else:
+ fromdata = ('',' ')
+ if tolist:
+ todata = tolist.pop(0)
+ else:
+ todata = ('',' ')
+ yield fromdata,todata,flag
+
+ def _collect_lines(self,diffs):
+ """Collects mdiff output into separate lists
+
+ Before storing the mdiff from/to data into a list, it is converted
+ into a single line of text with HTML markup.
+ """
+
+ fromlist,tolist,flaglist = [],[],[]
+ # pull from/to data and flags from mdiff style iterator
+ for fromdata,todata,flag in diffs:
+ try:
+ # store HTML markup of the lines into the lists
+ fromlist.append(self._format_line(0,flag,*fromdata))
+ tolist.append(self._format_line(1,flag,*todata))
+ except TypeError:
+ # exceptions occur for lines where context separators go
+ fromlist.append(None)
+ tolist.append(None)
+ flaglist.append(flag)
+ return fromlist,tolist,flaglist
+
+ def _format_line(self,side,flag,linenum,text):
+ """Returns HTML markup of "from" / "to" text lines
+
+ side -- 0 or 1 indicating "from" or "to" text
+ flag -- indicates if difference on line
+ linenum -- line number (used for line number column)
+ text -- line text to be marked up
+ """
+ try:
+ linenum = '%d' % linenum
+ id = ' id="%s%s"' % (self._prefix[side],linenum)
+ except TypeError:
+ # handle blank lines where linenum is '>' or ''
+ id = ''
+ # replace those things that would get confused with HTML symbols
+ text=text.replace("&","&").replace(">",">").replace("<","<")
+
+ # make space non-breakable so they don't get compressed or line wrapped
+ text = text.replace(' ',' ').rstrip()
+
+ return '<td class="diff_header"%s>%s</td><td nowrap="nowrap">%s</td>' \
+ % (id,linenum,text)
+
+ def _make_prefix(self):
+ """Create unique anchor prefixes"""
+
+ # Generate a unique anchor prefix so multiple tables
+ # can exist on the same HTML page without conflicts.
+ fromprefix = "from%d_" % HtmlDiff._default_prefix
+ toprefix = "to%d_" % HtmlDiff._default_prefix
+ HtmlDiff._default_prefix += 1
+ # store prefixes so line format method has access
+ self._prefix = [fromprefix,toprefix]
+
+ def _convert_flags(self,fromlist,tolist,flaglist,context,numlines):
+ """Makes list of "next" links"""
+
+ # all anchor names will be generated using the unique "to" prefix
+ toprefix = self._prefix[1]
+
+ # process change flags, generating middle column of next anchors/links
+ next_id = ['']*len(flaglist)
+ next_href = ['']*len(flaglist)
+ num_chg, in_change = 0, False
+ last = 0
+ for i,flag in enumerate(flaglist):
+ if flag:
+ if not in_change:
+ in_change = True
+ last = i
+ # at the beginning of a change, drop an anchor a few lines
+ # (the context lines) before the change for the previous
+ # link
+ i = max([0,i-numlines])
+ next_id[i] = ' id="difflib_chg_%s_%d"' % (toprefix,num_chg)
+ # at the beginning of a change, drop a link to the next
+ # change
+ num_chg += 1
+ next_href[last] = '<a href="#difflib_chg_%s_%d">n</a>' % (
+ toprefix,num_chg)
+ else:
+ in_change = False
+ # check for cases where there is no content to avoid exceptions
+ if not flaglist:
+ flaglist = [False]
+ next_id = ['']
+ next_href = ['']
+ last = 0
+ if context:
+ fromlist = ['<td></td><td> No Differences Found </td>']
+ tolist = fromlist
+ else:
+ fromlist = tolist = ['<td></td><td> Empty File </td>']
+ # if not a change on first line, drop a link
+ if not flaglist[0]:
+ next_href[0] = '<a href="#difflib_chg_%s_0">f</a>' % toprefix
+ # redo the last link to link to the top
+ next_href[last] = '<a href="#difflib_chg_%s_top">t</a>' % (toprefix)
+
+ return fromlist,tolist,flaglist,next_href,next_id
+
+ def make_table(self,fromlines,tolines,fromdesc='',todesc='',context=False,
+ numlines=5):
+ """Returns HTML table of side by side comparison with change highlights
+
+ Arguments:
+ fromlines -- list of "from" lines
+ tolines -- list of "to" lines
+ fromdesc -- "from" file column header string
+ todesc -- "to" file column header string
+ context -- set to True for contextual differences (defaults to False
+ which shows full differences).
+ numlines -- number of context lines. When context is set True,
+ controls number of lines displayed before and after the change.
+ When context is False, controls the number of lines to place
+ the "next" link anchors before the next change (so click of
+ "next" link jumps to just before the change).
+ """
+
+ # make unique anchor prefixes so that multiple tables may exist
+ # on the same page without conflict.
+ self._make_prefix()
+
+ # change tabs to spaces before it gets more difficult after we insert
+ # markkup
+ fromlines,tolines = self._tab_newline_replace(fromlines,tolines)
+
+ # create diffs iterator which generates side by side from/to data
+ if context:
+ context_lines = numlines
+ else:
+ context_lines = None
+ diffs = _mdiff(fromlines,tolines,context_lines,linejunk=self._linejunk,
+ charjunk=self._charjunk)
+
+ # set up iterator to wrap lines that exceed desired width
+ if self._wrapcolumn:
+ diffs = self._line_wrapper(diffs)
+
+ # collect up from/to lines and flags into lists (also format the lines)
+ fromlist,tolist,flaglist = self._collect_lines(diffs)
+
+ # process change flags, generating middle column of next anchors/links
+ fromlist,tolist,flaglist,next_href,next_id = self._convert_flags(
+ fromlist,tolist,flaglist,context,numlines)
+
+ import cStringIO
+ s = cStringIO.StringIO()
+ fmt = ' <tr><td class="diff_next"%s>%s</td>%s' + \
+ '<td class="diff_next">%s</td>%s</tr>\n'
+ for i in range(len(flaglist)):
+ if flaglist[i] is None:
+ # mdiff yields None on separator lines skip the bogus ones
+ # generated for the first line
+ if i > 0:
+ s.write(' </tbody> \n <tbody>\n')
+ else:
+ s.write( fmt % (next_id[i],next_href[i],fromlist[i],
+ next_href[i],tolist[i]))
+ if fromdesc or todesc:
+ header_row = '<thead><tr>%s%s%s%s</tr></thead>' % (
+ '<th class="diff_next"><br /></th>',
+ '<th colspan="2" class="diff_header">%s</th>' % fromdesc,
+ '<th class="diff_next"><br /></th>',
+ '<th colspan="2" class="diff_header">%s</th>' % todesc)
+ else:
+ header_row = ''
+
+ table = self._table_template % dict(
+ data_rows=s.getvalue(),
+ header_row=header_row,
+ prefix=self._prefix[1])
+
+ return table.replace('\0+','<span class="diff_add">'). \
+ replace('\0-','<span class="diff_sub">'). \
+ replace('\0^','<span class="diff_chg">'). \
+ replace('\1','</span>'). \
+ replace('\t',' ')
+
+del re
+
def restore(delta, which):
r"""
Generate one of the two sequences that generated a delta.
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