If you have a limited number of Python server processes it is much faster, simpler, and more secure to just cache in the memory of each process. It has no authentication or encryption and will introduce a gaping hole in your defenses unless you are careful.
If you are caching sensitive data you should take measures to ensure that a untrusted local system users cannot connect to memcached server, b untrusted external servers cannot connect, and c untrusted users on trusted external servers cannot connect. As with Lisp macros, they take source code Cheetah source as input and return source code again Cheetah source as output.
They are executed at compile-time, just like in Lisp and C. The resultant code gets executed at run-time. The new defmacro directive allows users to create macros inside the source of their templates. The syntax for the opening tag of defmacro is the same as for def and block. It expects a macro name followed by an optional argument list in brackets. The value of the src is the block of input source code that is provided during a macro call see below :. These were found via new unit tests.
No one had actually run into them yet. The method it calls, self. It currently has one required positional argument message.
I anticipate supporting the following optional arguments:. The rather longwinded compiler setting gobbleWhitespaceAroundMultiLineComments can be used to go back to the old non-gobbling behaviour if needed.
See the docstring for details. It takes the same args as the. It simplifies the reuse of dynamically compiled templates:. A side-benefit is the possibility to use the same Cheetah source with several baseclass, as the baseclass is orthogonal to the source code, unlike the extends directive.
Templates can now use super , properties and all the other goodies that come with new-style classes. This is on by default and protects against bad performance issues that are due to programmers misguidedly compiling templates inside tight loops.
It also saves on memory usage. The old usage pattern Template src now benefits from most of the recent changes:. You can now provide defaults via class attributes. This was previously limited to fairly simple target lists:. This was previously limited to fairly simple target lists. Also documented the hooks in a docstring. Reported by JJ. The same applies to block. JJ reported that this was causing great confusion with beginners. The purpose is to avoid a positional argument clash that apparently is very confusing for beginners.
Note that any existing client code that passing the trans arg in positionally rather than as a keyword will break as a result. WebKit does this with the. It is now possible to keep the generated source code from the python classes returned by Template. Having these files around allows Python to include the actual source lines in tracebacks and makes them much easier to understand:. Note, Cheetah generated modules that are compiled on the command line have never been affected by this issue.
See the examples I posted to the email list on Dec 12th. This came from a suggestion by Mike Orr. You must either compile your classes on the command line or use the new classmethod Template. See my messages to the email list for more details. See the new classmethod Template. You can now define a subclass of Template which will compile your templates using custom compilerSettings, or even a custom compiler class, without requiring you to manually pass in your compilerSettings each time or define them in the template src itself via the compiler directive.
This makes all lookup that occur within the scope of that method use the provided searchList rather than self. This does not carry over to other methods called within the top method, unless they explicitly accept the searchList in their signature AND you pass it to them when calling them. These hooks can be used to enable Cheetah template authoring by untrusted users.
Here are the relevant compiler settings: use lower case keys here!! See the email list for more details. This is related to the arbitrary baseclass change. This allows you to do things like this:. I needed it for a wiki system in which the baseclasses for the templates are dynamically compiled at run time and are not available via simple imports. Reported by Marcin Gajda [TR]. See the discussion on the email list [TR]. See my email to the cheetahtemplate-discuss list on Sat. This simple bug fix release resolves some issues introduced by under-the-hood changes in release 0.
This removes a whole slew of issues, including a temp file security issue reported on the email list by Brian Bird. Thanks to Michael Engelhart for reporting it. Kludge in CheetahWrapper. They are now completely separate trees and the communication between them is one-way: explicit commands from the parser to the compiler.
All but the first have defaults in attributes of the Template class which can be overridden in subclasses of this class. Working with most of these is an advanced topic.
These can also be overridden in your template source code with the compiler or compiler-settings directives. Compiler a subclass of Cheetah. Mucking with this is a very advanced topic. If the provided value is None and a file arg was given, the moduleName is created from the file path.
In all cases if the moduleName provided is already in sys. If the provided value is None, the moduleName is use as the class name. The extends directive trumps this arg. If the provided value is a string you must make sure that a class reference by that name is available to your template, either by using an import directive or by providing it in the arg 'moduleGlobals'. If the provided value is a class, Cheetah will handle all the details for you.
This should be Python values, not code strings! If True and a previous compilation created a cached template class with the same source code, compiler settings and other options, the cached template class will be returned. They provide a way to use Cheetah as a code generator for Cheetah code.
In other words, you use one Cheetah template to output the source code for another Cheetah template. The major expected use cases are: a 'compile-time caching' aka 'partial template binding', wherein an intermediate Cheetah template is used to output the source for the final Cheetah template. The intermediate template is a mix of a modified Cheetah syntax the 'preprocess syntax' and standard Cheetah syntax.
The preprocessor syntax is executed at compile time and outputs Cheetah code which is then compiled in turn. This approach allows one to completely soft-code all the elements in the template which are subject to change yet have it compile to extremely efficient Python code with everything but the elements that must be variable at runtime per browser request, etc.
Examples of this usage pattern will be added to the Cheetah Users' Guide. Each preprocessor should accept the args source, file and should return a tuple source, file. The argument value should be a list, but a single non-list value is acceptable and will automatically be converted into a list.
Each item in the list will be passed through Template. The items should either match one of the following forms: - an object with a. Dec 18, Dec 14, Nov 11, Nov 1, Sep 16, Sep 11, Sep 5, Aug 29, Aug 27, Aug 15, Aug 11, Aug 7, Jul 30, Jul 9, Jun 29, Jun 21, May 29, Jun 3, Dec 17, Download the file for your platform.
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