Utilities for building and manipulating ElementTrees
Project description
Klon is a collection of Python utilities for manipulating ElementTrees. It's a thin-ish, transparent wrapper around the lxml.etree module.
klon.build_etree
Source code: klon/build.py
A utility for building element trees using list and string literals.
>>> from klon import build_etree
>>> etree = build_etree(
... 'html',
... [
... 'head',
... ['title', 'Test Document'],
... ],
... [
... 'body',
... ['h1#title', 'This is a test'],
... ['a', {'href': '/page'}, ['img', {'src': 'image.jpg'}]],
... [
... 'p.text',
... 'This is a text',
... ['br'],
... 'This is a tail',
... ],
... ],
... )
Nested lists are translated to nested elements:
- the first element in the list must be a string, and becomes the tag name
- optionally, the second element can be a dict, specifying tag attributes
- any other elements become the tag's children
As a convenience, the id and class attributes can be set directly from the
tag name string, using CSS-like syntax: tag#id and tag.class.
klon.tostring
Source code: klon/utils.py
A thin wrapper around lxml.etree.tostring.
Defaults to HTML rules for rendering the element tree to a string. In these
examples we use method="xml" to achieve nicer pretty-printing.
>>> from klon import tostring
>>> print(tostring(etree, pretty_print=True, method="xml"))
<html>
<head>
<title>Test Document</title>
</head>
<body>
<h1 id="title">This is a test</h1>
<a href="/page">
<img src="image.jpg"/>
</a>
<p class="text">This is a text<br/>This is a tail</p>
</body>
</html>
The main difference with the underlying LXML function is that encoding=str by
default, i.e. it produces strings by default, rather than bytes.
klon.extract_text
Source code: klon/text.py
Extracts all text from the given node and its descendants.
By default, all contiguous whitespace is normalized to a single ASCII space,
and so the output will always be a single line of text. However if
multiline=True is specified, paragraph-breaking tags are preserved, in the
same way that a web browser would. Other whitespace is still normalized, but
the output now contains both ASCII spaces and ASCII newlines.
>>> from klon import extract_text
>>> body = etree.find('body') # using the same example etree defined above
>>> print(tostring(body, pretty_print=True, method="xml"))
<body>
<h1 id="title">This is a test</h1>
<a href="/page">
<img src="image.jpg"/>
</a>
<p class="text">This is a text<br/>This is a tail</p>
</body>
>>> extract_text(body)
'This is a test This is a text This is a tail'
>>> extract_text(body, multiline=True)
'This is a test\n\nThis is a text\nThis is a tail'
Note that the <p> tag translates to a double newline, while the <br> tag
translates to a single \n, mimicking how a browser renders them.
klon.detach
Source code: klon/utils.py
Takes one node as argument, and removes it from its tree. Takes care to
preserve the node's tail text by reattaching it to the correct position in
the tree.
>>> from klon import detach
>>> print(tostring(body, pretty_print=True, method="xml"))
<body>
<h1 id="title">This is a test</h1>
<a href="/page">
<img src="image.jpg"/>
</a>
<p class="text">This is a text<br/>This is a tail</p>
</body>
>>> br = detach(body.xpath('.//br')[0])
>>> print(tostring(body, pretty_print=True, method="xml"))
<body>
<h1 id="title">This is a test</h1>
<a href="/page">
<img src="image.jpg"/>
</a>
<p class="text">This is a textThis is a tail</p>
</body>
Note that This is a tail, which was the tail of the <br> node, has been
preserved, in this case by appending it to the text of its parent node.
klon.make_all_urls_absolute
Source code: klon/html.py
Takes a URL and a document etree, and modifies the etree in place to convert
all relative URLs to absolute ones, using the given URL as a base. All standard
tag attributes that specify a URL (e.g. <a href="...">, <img src="...">,
<form action="..."> etc) are converted.
>>> from klon import make_all_urls_absolute
>>> print(tostring(body.find('a')))
<a href="/page"><img src="image.jpg"></a>
>>> make_all_urls_absolute('https://site.com/path/', etree)
>>> print(tostring(body.find('a')))
<a href="https://site.com/page"><img src="https://site.com/path/image.jpg"></a>
klon.parse_form
Source code: klon/forms.py
Takes an ElementTree whose root is a <form> node, and returns a
requests.Request that corresponds to the request that would be sent by a
browser if the form was submitted.
>>> from klon import parse_form
>>> form = build_etree(
... 'form',
... {'method': 'POST', 'action': '/publish'},
... [
... 'div',
... ['input', {'name': 'title', 'value': 'Some title'}],
... ],
... [
... 'select',
... {'name': 'kind'},
... ['option', {'value': 'comment'}, 'Comment'],
... ['option', {'value': 'question', 'selected': 'yes'}, 'Question'],
... ],
... )
>>> request = parse_form(form, base_url='https://web.site/')
>>> request.url
'https://web.site/publish'
>>> request.method
'POST'
>>> request.data
{'title': 'Some title', 'kind': 'question'}
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