Python templating engine - the one ton solution
Project description
Tonnikala
Tonnikala is the latest reincarnation among the Python templating languages that feed on Kid-inspired XML syntax. It rejects the Kid and Genshi notions of tagstreams and trees, and follows in footsteps of Chameleon and Kajiki in making the template to compile into Python bytecode directly. The syntax is very close to that of Kajiki, but the internals are very different: Tonnikala writes code as Abstract Syntax Trees and optimizes the resulting trees extensively. In addition, there is an optional speed-up module (currently Python 3 only), that provides a specialized class used for output buffering.
Examples
from tonnikala.loader import Loader
template_source = u"""
<table>
<tr py:for="row in table">
<py:for each="key, value in row.items()"
><td>${key}</td><td>${literal(value)}</td></py:for>
</tr>
</table>
"""
template = Loader().load_string(template_source)
ctx = {
'table': [dict(a=1,b=2,c=3,d=4,e=5,f=6,g=7,h=8,i=9,j=10)
for x in range(1000)]
}
print(template.render(ctx))Template inheritance
base.tk
<html>
<title><py:block name="title_block">I am ${title}</py:block></title>
<py:def function="foo()">I can be overridden too!</py:def>
<h1>${title_block()}</h1>
${foo()}
</html>child.tk
<py:extends href="base.tk">
<py:block name="title_block">But I am ${title} instead</py:block>
<py:def function="foo()">I have overridden the function in parent template</py:def>
</py:extends>Template imports
importable.tk
<html>
<py:def function="foo()">I am an importable function</py:def>
</html>importer.tk
<html>
<py:import href="importable.tk" alias="imp" />
${imp.foo()}
</html>FileLoader
To load templates from files, use the tonnikala.FileLoader class:
loader = FileLoader(paths=['/path/to/templates'])
template = loader.load('child.tk')A FileLoader currently implicitly caches all loaded templates in memory.
Template
To render the template:
result = template.render(ctx)You can specify a block, or no-argument def to render explicitly:
result = template.render(ctx, funcname='title_block')Pyramid integration
Include ‘tonnikala.pyramid’ into your config to enable Tonnikala. When included, tonnikala adds the following configuration directives:
- add_tonnikala_extensions(*extensions)
Registers tonnikala renderer for these template extensions. By default Tonnikala is not registered as a renderer for any extension. For example: config.add_tonnikala_extensions(‘.html’, ‘.tk’) would enable Tonnikala renderer for templates with either of these extensions.
- add_tonnikala_search_paths(*paths)
Adds the given paths to the end of Tonnikala search paths that are searched for templates. These can be absolute paths, or package.module:directory/subdirectory-style asset specs. By default no paths are searched explicitly (but you can always use an asset spec for template.
- set_tonnikala_reload(reload)
If True, makes tonnikala not cache templates. Default is False.
These 3 can also be controlled by tonnikala.extensions, tonnikala.search_paths and tonnikala.reload in .ini settings.
Status
Alpha, working features are
Structural elements py:if, py:unless, py:def, py:for, py:replace, py:content
Basic template inheritance: py:extends and py:block; the child template also inherits top level function declarations from the parent template, and the child can override global functions that the parent defines and uses.
Expression interpolation using $simple_identifier and ${complex + python + "expression"}
Boolean attributes: <tag attr="${False}">, <tag attr="$True">
Implicit escaping
Disabling implicit escaping (literal())
C speedups for both Python 2 and Python 3
Importing def blocks from another template: py:import
Basic I18N using gettext.
Pyramid integration
Upcoming features:
Structural elements: py:vars, py:switch, py:case; py:else for for, if and switch.
Overriding attributes, setting attrs from dictionary: py:attrs
Custom tags mapping to py:def
I18N with optional in-parse-tree localization (partially done)
Javascript as the target language
Pluggable frontend syntax engines (partially done)
METAL-like macros
Pluggable expression languages akin to Chameleon
Even better template inheritance
Better documentation
Contributors
Antti Haapala
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