README

Experiment in Javascript and Postscript

I wanted to learn a new language and for some odd reason decided on Postscript.
Rather than just pick up a book and read about it I decided to implement a 
Postscript interpreter. This program is the result of going through the
Postscript Bluebook and implementing what it teaches page by page. The implementation 
isn't complete, but many primitives are working and the structure that was evolving 
should be obvious.

For the implemenation I decided to also pick up a couple of things that I
hadn't done (either never before or not for a while):

   * Javascript without a supporting lib (no prototype, jQuery, or the like)
   * HTML5 Canvas
   * Jasmine test framework
   * HTML5 Websockets
   * The Mojolicious framework

These components come together with the canvas and Javascript sans lib being
used to implement the parser, interpreter, and renderer.  The server (server.pl) 
for the Postscript viewer uses (a very small amount of) the Mojolicious framework.

The test system is written with Jasmine, Mojolicious, and Websockets. The tests run
by executing test.pl. The first thing that happens then is that a child process is
forked to run the web server. Next another child is forked to run the browser (at
the moment it only works on a Mac with Safari). The browser loads a generated HTML
page from the server. This page simply loads in all of the Javascript needed to run
the tests as well as the tests themselves.

The test infrastructure then connects to the server using a Websocket and uses Jasmine
to execute the tests. As the tests run the results are sent back to the server, which 
reports them using TAP (so you can just use prove to run the test script and get a nice 
test report). After all of the tests have finished the browser and server are shut down.