Summary

As announced previously, I recently wrote an implementation of JSON Template in Typed Racket. This is a port of the original untyped Racket code to R⁶RS.

Like the Racket version, it is likely to contain a number of bugs because of lack of real-world usage.

JSON Template is a minimalistic, declarative template language.

Downloading

You can fetch the Mercurial repository using the following command:

hg clone http://matthias.benkard.de/code/json-template-r6rs/

(Mind the trailing slash. My web server is overly picky there.)

Documentation and Installation

See the manual for installation and usage instructions.

Dependencies

JSON Template for R⁶RS depends on the pregexp library.

Implementation Features

• HTML and URI escaping through the use of formatters
• Supports both association lists and hash tables as input data
• Configurable meta characters
• GPLv3 license

Missing Things

• Literals (like {.space} and {.meta-left}/{.meta-right})
• Multiple-argument formatters
• Some kind of compilation for efficiency

Examples

Example code:

(define template-string "
<h1>{title|html}</h1>
{.section people}
<ul>
{.repeated section @}
  <li>{name} ({age} years)</li>
{.end}
</ul>
{.or}
<p>No one's registered.</p>
{.end}")

(define template (make-template template-string))

(template '((title . "<Registered People>")
            (people .
                    (((name . "Nathalie") (age . 24))
                     ((name . "Heinrich") (age . 28))
                     ((name . "Hans")     (age . 25)))))))

Result:

<h1>&#60;Registered People&#62;</h1>
<ul>
  <li>Nathalie (24 years)</li>
  <li>Heinrich (28 years)</li>
  <li>Hans (25 years)</li>
</ul>