deliverance-like implementation that only works on html output(no theme file)
Project description
Introduction
Bumblebee is a deliverance-like html transformation framwork implementation that only works on the output an html document.
It doesn’t use xslt so it isn’t as fast as what Diazo is; however, it accomplishes the very simple use-case of moving elements around on html output.
Why
Because I almost never needed the full-fledge deliverance approach for what I wanted to do. In fact, it was usually an annoyance when all I wanted to do was move an element around on a page.
How-to Use
Configurating your transformations is done with a very xml syntax.
Example:
HTML:
<html>
<head></head>
<body>
<div id="#header"></div>
<div id="content"></div>
<div id="footer"></div>
</body>
</html>
Rules XML:
<xml>
<block if-content="#content">
<after src="#header" dst="#footer" />
</block>
</xml>
Running it through:
from bumblebee import transform from repoze.xmliter.utils import getHTMLSerializer from bumblebee.xml import convertRules html = getHTMLSerializer(output) rules = convertRules(rules_xml) result = transform(html, rules)
Selectors
For xml configuration that selects elements, you can use CSS selectors(default) or XPath.
To use XPath, just append ‘-path’ onto the node name:
<after src-xpath="/html/body/div[0]" src-xpath="/html/body/div[2]" />
arbitrary html
Use this to inject html into a page:
<after src-html="" dst="#foo">
<div id="foobar">
<h1>hello, world</h1>
</div>
</after>
Rules
Before
Move an element before another element:
<before src="#foo" dst="#bar" />
Moves “#foo” before “#bar”
After
Move an element after another:
<after src="#foo" "#bar" />
Moves “#foo” after “#bar”
Drop
Remove an element from the dom:
<drop src="#foo" />
Replace
Replace an element with another:
<replace src="#foo" dst="#bar" />
Replaces “#dst” with “#src”
Class
Add or remove classes from an element:
<class src="#foo" add="three four" remove="one two" />
Remove the classes “one” and “two” from “#foo” and add the classes “three” and “four”.
Tag
Change a tag:
<tag src="#foo" tag="p" />
Group
Group rules together with a conditions:
<group if-content="#foo">
<drop src="#bar" />
</group>
Performs some rules if “#foo” is in the document.
Conditions
if-content
Performs actions if the selector is found in the document:
<after src="#foo" dst="#bar" if-content="#foo" />
not conditiion
Any condition can be negated for the opposite affect:
<drop src="#foo" if-not-content="#bar" />
Extending
Creating a Rule:
from bumblebee.rules import BaseDouble
class Append(BaseDouble):
def __call__(self, root):
src, dst, skip = self.process_nodes(root)
if skip:
return None
dst = dst[0]
for el in dst:
dst.append(el)
return src
from bumblebee.xml import addTag
addTag('append', Append)
To use the rule, you would:
<append src="#foo" dst="#bar" />
Creating a Condition:
from bumblebee.conditions import BaseIf
class IfPath(BaseIf):
def __init__(self, path, extras={}):
super(IfPath, self).__init__(extras)
self.path = path
def __call__(self, root):
req = self.extras['request']
path = req['PATH_INFO']
if self.path.startswith('/'):
return path.startswith(self.path)
else:
return self.path in path
from bumblebee.xml import addCondition
addCondition('path', IfPath)
To use this condition, you would:
<drop src="#foo" if-path="/foo/bar" />
or:
<drop src="#foo" if-not-path="/foo/bar" />
CHANGELOG
1.0a2 ~ (2011-09-22)
add support for arbitrary html
better support for adding new selectors, conditions, rules
better parsing
better handle extras parameters so that rules can be more easily cached
Release history Release notifications | RSS feed
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