New submission from Leon Matthews <[email protected]>:
The lxml implementation of the ElementTree API puts a `sourceline` property
onto every Element object, which I recently found useful when producing
diagnostic messages. I think it would be a useful improvement to make the
standard library's ElementTree implementation.
The attached patch works by copying the current line number from the Expat
parser into the Element object after the Element object is created (so as to
minimise its intrusiveness for now).
The patch is just a proof of concept, and although all tests pass, the patch
currently smells a little hacky and fragile to me. Hopefully though, it will
start a discussion with somebody more experienced.
PS. So as not to create a hard dependency on lxml.etree, in my project I worked
around the issue as follows. While this works in my case, the standard library
seems a more logical place for this change::
class XMLParserWithLines(XMLParser):
"""
Add a `sourceline` attribute to element, like lxml.etree
"""
def _start_list(self, *args, **kwargs):
element = super(self.__class__, self)._start_list(*args, **kwargs)
element.sourceline = self._parser.CurrentLineNumber
return element
>>> tree = ElementTree()
>>> tree.parse(path, parser=XMLParserWithLines())
>>> ...
----------
components: Library (Lib)
files: elementtree-sourceline.diff
keywords: patch
messages: 153907
nosy: leonov
priority: normal
severity: normal
status: open
title: Add 'sourceline' property to xml.etree Elements
versions: Python 3.3
Added file: http://bugs.python.org/file24594/elementtree-sourceline.diff
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