FreshMarker

Context-Sensitive Tokenization With CongoCC

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If you want to interpret a programming language or a DSL, there’s no way around using a parser generator. At the heart of FreshMarker is a template parser generated by the CongoCC parser generator. I can’t praise this JavaCC successor from Jon Revusky highly enough. Many new features and completely revised parts make the parser generator much more usable than its seemingly dead predecessor. CongoCC also helps wonderfully with a small current problem.

Quo Vadis, Lambda?

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To implement a new built-in for sequences, lambdas were added as a new language component of the FreshMarker Expression Language. The lambda expression made it much easier to map the semantics of the new count built-in in an easily readable syntax. Now that lambda expressions are available, what else can they be used for and what still needs to be implemented?

Select Operator for FreshMarker

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An important component of the FreshMarker template engine is the built-in expression language. The expression language is used to utilize not only variables but also complex expressions in directives and interpolations. When evaluating other expression languages for customer projects, sometimes I am interested in integrating some findings into the FreshMarker expression language.

Partial Expression Reduction

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The FreshMarker template engine has the Partial Template Reduction feature. This makes it possible to create a new Template from an existing Template by adding an incomplete model. Some constructs are simplified in the new Template because the data from the incomplete model could be evaluated there. Until now, this could only be used in directives and interpolations, so why not use the mechanism in expressions as well?

In Search Of Performance (2)

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This article on performance was not actually intended to be a multi-part article. But if you take a closer look at your own code through performance glasses, you will quickly discover further bottlenecks. In this case, it’s an unclean modeling that FreshMarker has been carrying around since its early days. This article is about how this affects the performance of the template engine.