It provides a simple, yet powerful, caching mechanism that can dramatically improve the performance of a dynamic website. It encourages clean separation of content, graphic design, and program code. This leads to highly modular, flexible, and reusable site architectures, shorter development time, and HTML and program code that is easier to understand and maintain. It is particularly well suited for team efforts. Cheetah can be used to generate static html via its command-line tool. Older versions do not support cheetah.
We are going to test our templates with this minimal controller. Just replace the contents of controllers. Note the encoding declaration at the top of the file, so that we can use UTF-8 characters in our unicode strings. Make sure to save this file with UTF-8 encoding. Replace cheetahtemplates in the template name with the package name of your project. With Cheetah your templates can subclass a pure Python class. Attributes and functions of this class are available as template variables.
This allows to define some handy utility functions you can use in your templates:. You can put anything you want into a context, BUT you have to use the. Cheetah takes a different approach. Furthermore, Cheetah allows you to specify a list namespaces that will be searched in sequence to find a varname-to-value mapping. This searchList can be extended at run-time.
The points discussed in section comparisons. However, neither of these are complete yet. The syntax and functions are like a cross between Perl and C plus some original ideas e. The author has not used Smarty. Please send corrections or ommissions to the Cheetah mailing list. Like Cheetah, Smarty:. Preprocessors, postprocessors and output filters.
You can emulate a preprocessor in Cheetah by running your template definition through a filter program or function before Cheetah sees it. To emulate a postprocessor, run a. Variable modifiers. Cheetah directives are tightly bound to the compiler. Called by WebKit to produce the web transaction content. For a template-servlet, this means filling the template. This listing is based on a CVS snapshot of Webware dated 22 September , and may not include more recent changes.
True if the servlet can be used for another transaction after the current transaction is finished. Here are some things you can do to make your templates fill faster and user fewer CPU cycles. Before you put a lot of energy into this, however, make sure you really need to. In many situations, templates appear to initialize and fill instantaneously, so no optimization is necessary. Moving variable lookups into Python code may provide a speedup in certain circumstances.
For instance, to set a local variable to an elaborate initializer. This syntax also may be used to set a local variable with a complicated initializer. To access Cheetah services, you must use Python code like you would in an inherited Python class. Aditionally, InquiryTemplate itself depends on ErrorsTemplate. Template classes may be shared freely between threads. However, template instances should not be shared unless you either:. Use a lock mutex to serialize template fills, to prevent two threads from filling the template at the same time.
Any changes to these in one thread will be visible in other threads, causing them to give inconsistent output. About the only advantage in sharing a template instance is building up the placeholder cache. If you have to change searchList values or instance variables before each fill which is usually the case , lock the mutex before doing this, and unlock it only after the fill is complete.
Contributed by Edmund Lian. Return a reference to the current error catcher. Break reference cycles before discarding a servlet.
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