Tools for converting HTMLs to dicts & calculating diff between them
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diff4html
Tools for converting HTMLs to dicts & calculating diff between them.
🔎 What for?
Well, if you need to calculate the diff between HTML pages without inplace markup (with <ins> & <del> tags), or maybe you experience issues with matching these tags later, or even find the htmldiff's behavior not entirely accurate, then diff4html may be a great fit for you.
Unlike htmldiff, the result here is a difference object. This object is a list containing information about each change. Each change, in turn, is described by the start and end indices of the modification in the original HTML page, along with the subject of the change.
Application of this is fully handled by diff4html and can be triggered via simple Python API, so you don't have to restore snapshots on your own.
🛠️ Installation
pip install diff4html
⚡️ Usage
Let's start with running IPython or Jupyter and making two HtmlDicts for our pages. The one for an example.org page and the other for slightly modified version of it:
HtmlDict here is simply a representation of HTML tree built on native Python dict & list data types.
In [1]: import requests
from diff4html import HtmlDict
page_1 = HtmlDict(requests.get("https://example.org").text)
page_2 = HtmlDict("""
<html>
<head>
<title>Example Domain</title>
<!-- NOTICE: missing meta & styles here -->
</head>
<body>
<div>
<h1>Example Domain modified</hi> <!-- NOTICE: changed text-->
<!-- NOTICE: missing rest -->
</div>
</body>
</html>
""")
page_2
Out[1]: <HtmlDict({...})>
Let's then calculate diff between them. For example: I don't want to store the whole page 2 source code and want only delta to remain.
In [2]: diff = page_2 - page_1
diff
Out[2]: <HtmlDiff([...])>
What this code does is it determines which parts of page 1 were deleted, modified, and added in page 2, and returns information about all these changes in the form of an HtmlDiff object.
HtmlDiff, in the context of page 2 - page 1, is a list of changes in the form of (
s,e,t), wheresandeare the start and end indices pointing to the differing element in page 1, andtis the content of the corresponding differing element in page 2.
If one day I want to restore the entire source code of the page 2 I can do the following. We can check their equality right away:
In [3]: page_2_restored = page_1 + diff # you can think of it as:
# page_1 + (page_2 - page_1) => page_1 + page_2 - page_1 => page_2
page_2_restored == page_2
Out[3]: True
BTW: there is a hash mechanism under the hood that protects the delta to be applied to any random html:
In [4]: diff + page_2 # diff can be applied to page_1 only
Out[4]: ValueError: wrong snapshot used for applying diff
And if I want to use lxml after all here's a pretty straight workaround for it:
In [5]: page_2_restored.to_lxml()
Out[5]: <Element div at 0x000000000>
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