An experimental diff library for generating operation deltas that represent the difference between two sequences of comparable items.
Project description
Deltas
======
An open licensed (MIT) library for performing generating deltas (A.K.A sequences
of operations) representing the difference between two sequences of comparable
tokens.
* **Installation:** **TODO**
* **Repo**: `http://github.com/halfak/Deltas`_
This library is intended to be used to make experimental difference detection
strategies more easily available. There are currently two strategies available:
``deltas.sequence_matcher.diff(a, b)``:
A shameless wrapper around `difflib.SequenceMatcher` to get it to work
within the structure of *deltas*.
``deltas.sequence_matcher.diff(a, b, segmenter=None)``:
A generalized difference detector that is designed to detect block moves
and copies based on the use of a ``Segmenter``.
:Example:
>>> from deltas import segment_matcher, apply
>>>
>>> a_tokens = ["This", " ", "comes", " ", "first", ".",
... " ",
... "This", " ", "comes", " ", "second", "."]
>>>
>>> b_tokens = ["This", " ", "comes", " ", "second", ".",
... " ",
... "This", " ", "comes", " ", "first", "."]
>>>
>>> operations = segment_matcher.diff(a_tokens, b_tokens)
>>>
>>> for operation in operations:
... print(operation)
...
Equal(name='equal', a1=7, a2=13, b1=0, b2=6)
Insert(name='insert', a1=6, a2=7, b1=6, b2=7)
Equal(name='equal', a1=0, a2=6, b1=7, b2=13)
Delete(name='delete', a1=6, a2=7, b1=13, b2=13)
======
An open licensed (MIT) library for performing generating deltas (A.K.A sequences
of operations) representing the difference between two sequences of comparable
tokens.
* **Installation:** **TODO**
* **Repo**: `http://github.com/halfak/Deltas`_
This library is intended to be used to make experimental difference detection
strategies more easily available. There are currently two strategies available:
``deltas.sequence_matcher.diff(a, b)``:
A shameless wrapper around `difflib.SequenceMatcher` to get it to work
within the structure of *deltas*.
``deltas.sequence_matcher.diff(a, b, segmenter=None)``:
A generalized difference detector that is designed to detect block moves
and copies based on the use of a ``Segmenter``.
:Example:
>>> from deltas import segment_matcher, apply
>>>
>>> a_tokens = ["This", " ", "comes", " ", "first", ".",
... " ",
... "This", " ", "comes", " ", "second", "."]
>>>
>>> b_tokens = ["This", " ", "comes", " ", "second", ".",
... " ",
... "This", " ", "comes", " ", "first", "."]
>>>
>>> operations = segment_matcher.diff(a_tokens, b_tokens)
>>>
>>> for operation in operations:
... print(operation)
...
Equal(name='equal', a1=7, a2=13, b1=0, b2=6)
Insert(name='insert', a1=6, a2=7, b1=6, b2=7)
Equal(name='equal', a1=0, a2=6, b1=7, b2=13)
Delete(name='delete', a1=6, a2=7, b1=13, b2=13)
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