Refactoring of difflib.Differ

[cmalamas]

BPO	600984
Nosy	@tim-one
Files	patch: Patch of difflib from the 2.1.x branch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/tim-one'
closed_at = <Date 2003-04-12.01:30:07.000>
created_at = <Date 2002-08-27.20:54:29.000>
labels = ['library']
title = 'Refactoring of difflib.Differ '
updated_at = <Date 2003-04-12.01:30:07.000>
user = 'https://bugs.python.org/cmalamas'

bugs.python.org fields:

activity = <Date 2003-04-12.01:30:07.000>
actor = 'nnorwitz'
assignee = 'tim.peters'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2002-08-27.20:54:29.000>
creator = 'cmalamas'
dependencies = []
files = ['4542']
hgrepos = []
issue_num = 600984
keywords = ['patch']
message_count = 3.0
messages = ['41040', '41041', '41042']
nosy_count = 3.0
nosy_names = ['tim.peters', 'nnorwitz', 'cmalamas']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue600984'
versions = []

[cmalamas]

The difflib.Differ class currently only acts as a helper for
ndiff, creating human-readable diffs that mimic the Unix
diff. This patch refactors Differ into two layers:
BaseDiffer and Differ.

BaseDiffer contains the workhorse algorithms of the
current Differ without format-specific code. Instead, it
adds event handlers that are triggered as the diff is
calculated. Thus the Differ engine can now be used to
produce diff reports in other formats (like HTML or XML)
or to add programmatic behavior --for example to extract
only inserted XML from an XML feed for faster parsing.

Differ implements the BaseDiffer API to produce a
backwards-compatible diff, just like ndiff.

[cmalamas]

Logged In: YES
user_id=71233

Forgot to say that this is a 2.1 patch only as I cannot test 2.2
yet. Assigned to Tim, since it's 95% his code.

[nnorwitz]

Logged In: YES
user_id=33168

Costas, since this patch would only be applied against 2.3,
the current patch is not useful. If you are interested in
forward porting the patch to current code, we can consider
it then. Thanks.