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authorEvgeny Fadeev <evgeny.fadeev@gmail.com>2009-07-10 19:14:09 -0400
committerEvgeny Fadeev <evgeny.fadeev@gmail.com>2009-07-10 19:14:09 -0400
commit5b45e526c74faf55110ff0afdcba19797d7e0f4d (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /forum/diff.py
parentbb801f2bbd9f26bebca846b71e8947a1951f86a5 (diff)
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-#!/usr/bin/python2.2
-"""HTML Diff: http://www.aaronsw.com/2002/diff
-Rough code, badly documented. Send me comments and patches."""
-
-__author__ = 'Aaron Swartz <me@aaronsw.com>'
-__copyright__ = '(C) 2003 Aaron Swartz. GNU GPL 2.'
-__version__ = '0.22'
-
-import difflib, string
-
-def isTag(x): return x[0] == "<" and x[-1] == ">"
-
-def textDiff(a, b):
- """Takes in strings a and b and returns a human-readable HTML diff."""
-
- out = []
- a, b = html2list(a), html2list(b)
- s = difflib.SequenceMatcher(None, a, b)
- for e in s.get_opcodes():
- if e[0] == "replace":
- # @@ need to do something more complicated here
- # call textDiff but not for html, but for some html... ugh
- # gonna cop-out for now
- out.append('<del>'+''.join(a[e[1]:e[2]]) + '</del><ins>'+''.join(b[e[3]:e[4]])+"</ins>")
- elif e[0] == "delete":
- out.append('<del >'+ ''.join(a[e[1]:e[2]]) + "</del>")
- elif e[0] == "insert":
- out.append('<ins >'+''.join(b[e[3]:e[4]]) + "</ins>")
- elif e[0] == "equal":
- out.append(''.join(b[e[3]:e[4]]))
- else:
- raise "Um, something's broken. I didn't expect a '" + `e[0]` + "'."
- return ''.join(out)
-
-def html2list(x, b=0):
- mode = 'char'
- cur = ''
- out = []
- for c in x:
- if mode == 'tag':
- if c == '>':
- if b: cur += ']'
- else: cur += c
- out.append(cur); cur = ''; mode = 'char'
- else: cur += c
- elif mode == 'char':
- if c == '<':
- out.append(cur)
- if b: cur = '['
- else: cur = c
- mode = 'tag'
- elif c in string.whitespace: out.append(cur+c); cur = ''
- else: cur += c
- out.append(cur)
- return filter(lambda x: x is not '', out)
-
-if __name__ == '__main__':
- import sys
- try:
- a, b = sys.argv[1:3]
- except ValueError:
- print "htmldiff: highlight the differences between two html files"
- print "usage: " + sys.argv[0] + " a b"
- sys.exit(1)
- print textDiff(open(a).read(), open(b).read())
-