http://www.omnigia.com/news Scheme, web applications, tech Thu, 12 Jun 2008 10:49:47 +0000 http://backend.userland.com/rss092 en Calling Javascript from Scheme just got easier in CPSCM: (define v 10) (define (f x) (+ x v)) (%cpscm:native "alert (" v ")") ;; Can pass Scheme variables and computations (%cpscm:native "alert (" (f 5) ")") All string arguments to %cpscm:native are copied verbatim to the output. Inner computations are still compiled as any normal Scheme ... http://www.omnigia.com/news/2007/09/10/cpscm-native-calls/ I've been considering an elisp back-end for CPSCM (so that we can program Emacs in R5RS Scheme). I thought the lack of lexical scoping would prove a major stumbling block, but in the end it turns out that Elisp will be somewhat easier to support than Common Lisp. Here are ... http://www.omnigia.com/news/2007/08/07/emacs-lisp-scoping-globals/ After several fixes and tweaks, the CPSCM Javascript backend passes the R5RS Pitfalls test with a full score. The Lisp backend almost does, but since I decided to stick with Lisp's convention of representing both false booleans and empty lists with NIL, it fails cases 5.1 - 5.3. Additionally, I have ... http://www.omnigia.com/news/2006/12/23/cpscm-r5rs-pitfalls/ I have added a Javascript backend for CPSCM. The compiled code runs either inside a browser or in Rhino. The Bubble sort example demonstrates compiled Scheme code running "in a web page" and interfacing with native Javascript code (the latter provides DHTML functionality). You can call ... http://www.omnigia.com/news/2006/12/14/cpscm-scheme-to-javascript/ Alessandro Colomba (of SISCweb fame) played with CPSCM and noted that he had trouble compiling the SRFI-1 reference implementation (you need a self-contained SRFI-1 to check). After investigating the problem, I found out that the culprit was the η-reduction code in simplify-sexp, which wasn't designed ... http://www.omnigia.com/news/2006/12/03/cpscm-improvements/ I am releasing CPSCM, a new Scheme compiler based on classic CPS conversion and trampolines. It will eventually support multiple backends (Javascript and Java are in the works), but currently it supports Scheme to Common Lisp translation. You can see it work right from your browser on the online demo ... http://www.omnigia.com/news/2006/11/25/cpscm-scheme/