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chameleon.zpt versus standard Zope page templates
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Mots-clés associés :
Zope,
Makina Corpus
Chameleon.zpt is a fast Zope Page Template implementation based on the Chameleon template compiler. It's largely compatible with zope.pagetemplate. Some benchmarks says Chameleon is 16x faster ! Chameleon page templates differ from standard Zope page templates in a few simple aspects which I propose to discover.
The default expression type is Python
With zope.pagetemplate
<div tal:content="python:2+2" />
With chameleon.zpt
<div tal:content="2+2" />
Tuple unpacking is allowed when defining variables
With zope.pagetemplate
<tal:vars define="a python:1; b python:2; c python:3"> ... </tal:vars>
With chameleon.zpt
<tal:vars define="(a, b, c) [1, 2, 3]">
...
</tal:vars>
Generators are allowed in tal:repeat statements
Note that the repeat variable is not available in this case.
With chameleon.zpt
<div tal:repeat="i <some generator>">
...
</some>
Attribute-access to dictionary entries is allowed in Python-expressions
With zope.pagetemplate
<span tal:define="mydict python:{'e1': 'one', 'e2': 'two'}"
tal:context="python:mydict['e1']"> using dictionary['key'] </span>
With chameleon.zpt
<span tal:define="mydict {'e1': 'one', 'e2': 'two'}"
tal:content="mydict.e1"> using dictionary.key </span>
Genshi expression interpolation syntax is supported outside tags and inside static attributes
With zope.pagetemplate
<span tal:define="world string:'css'"
class="" tal:attributes="class string:hello-$world"
tal:content="string:Hello, $world!">
Hello, css!
</span>
With chameleon.zpt
<span tal:define="world 'css'"
class="hello-${'world'}">
Hello, ${'world'}!
</span>
Chameleon templates and macros/slots for Grok Views
<html metal:define-macro="mypage">
<head></head>
<body>
The content:
<div metal:define-slot="mycontent">
Put your content here...
</div>
</body>
</html>
Use the "mypage" in a new template: mypage.cpt:
<html metal:use-macro="path:context/@@mymacros/template/macros/mypage">
<!-- slot 'mycontent' was defined in the macro above -->
<div metal:fill-slot="mycontent">
...
</div>
</html>