yaxmldiff is Yet Another XML Differ
Project description
yaxmldiff – Yet Another XML Diff Library
This library checks if two XML documents seem semantically equivalent. If not, it produces something similar to a unified diff.
Example:
>>> from yaxmldiff import compare_xml
>>> print(compare_xml("<same/>", " <same /> <!--ignored-->"))
None
>>> print(compare_xml("<doc><a id='a'/></doc>", "<doc><a name='a'/></doc>"))
<doc>
<a
- id="a"
+ name="a"
/>
</doc>
compare_xml()
Compare two XML documents.
If the documents are given as strings, they are parsed first.
Alternatively, the documents can be given as an lxml.etree
object.
Returns: None if both are equal, a diff otherwise.
Signature:
def compare_xml(
left: str | Element,
right: str | Element,
) -> str | None:
Examples
Example: equal documents
>>> print(compare_xml("<a/>", "<a/>"))
None
Example: different tag
>>> print(compare_xml("<a/>", "<b x='2'/>"))
- <a/>
+ <b .../>
Example: changed text
>>> print(compare_xml("<root><a/>foo</root>", "<root><a/>bar</root>"))
<root>
<a/>
- foo
+ bar
</root>
Example: nested changed text, collapses other nodes
>>> print(compare_xml(
... "<root><uninteresting a='b'>foo</uninteresting><scope>a</scope></root>",
... "<root><uninteresting a='b'>foo</uninteresting><scope>b</scope></root>",
... ))
<root>
<uninteresting ...>...</uninteresting>
<scope>
- a
+ b
</scope>
</root>
Example: inserted node
>>> print(compare_xml("<r><a/></r>", "<r><a/><b/></r>"))
<r>
<a/>
+ <b/>
</r>
Example: changed attributes
>>> print(compare_xml(
... "<a onlya='1' both='2' changed='3'/>",
... "<a onlyb='1' both='2' changed='4'/>",
... ))
<a both="2"
- onlya="1"
- changed="3"
+ changed="4"
+ onlyb="1"
/>
Example: can hande encoding declarations
>>> print(compare_xml(
... "<?xml version='1.0' encoding='UTF-8'?><a/>",
... "<a/>",
... ))
None
Example: comparison ignores surrounding space and newlines
>>> print(compare_xml("<a>b<c/></a>", "\n <a> \n b \n <c \n/> \n </a> \n "))
None
Example: pre-parse documents
>>> import lxml.etree
>>> print(compare_xml(lxml.etree.XML('<a parsed="yes"/>'), "<a parsed='no'/>"))
<a
- parsed="yes"
+ parsed="no"
/>
Related software
There are tons of XML diffing tools for Python.
Most closely related is lxml.doctestcompare
.
The lxml variant has lots of useful tools for doctests,
such as ignoring subtrees with an <any>
tag or content with an ...
ellipsis.
In contrast, yaxmldiff will compare two documents without further transformations.
Another big difference is in the output.
Whereas lxml will add inline annotations,
yaxmldiff tries to emulate a unified diff,
and will collapse uninteresting parts of the document.
Contributing
Use uv for virtualenv management.
After installing uv, run uv sync --all-extras --dev
to install dependencies.
Common development tasks are managed via the just
tasks runner.
Install it via your package manager.
If in doubt, use pipx install rust-just
.
Once installed, run just
or just qa
for a complete QA pipeline with linters+typechecking+tests.
Run just -l
to get a list of all recipes.
License
Copyright 2021-2024 Lukas Atkinson
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Changelog
0.2.0 – 2024-09-29
- minimum Python version is 3.8
- (internal) packaging modernization
0.1.0 - 2021-06-13
- initial release
Project details
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