Programming Languages, Martials Arts and Computers. The Weblog of Chris Double.
Gilad Bracha has a post on parser combinators in Smalltalk. It's a good introduction to parser combinators and how to implement them in an OO language. Christian Plesner follows up with more details on writing and using parser combinators in Smalltalk. Christian mentions the left recursion problem for parsing things like lists. For example this grammar: <expr-list> -> <expr-list> ","... more →
There's a post on Matt Croydon's weblog about using Lua to process JSON Web Services. The resulting Lua code is very easy to read. Here's my attempt at the same code in Factor: REQUIRES: libs/http-client libs/json ; USING: kernel io http-client json hashtables prettyprint sequences math namespaces ; more →
I've written a simple wrapper around the ODBC API for Factor. I based it on some Forth code I wrote a few years ago. It has only been tested in Windows but it works quite well and I plan to do some more work on it as I need features. In the meantime it's in my repository: darcs get http://www.bluishcoder.co.nz/repos/factor more →
Luke Gorrie has started a new weblog and he's posting about his experiences learning Squeak Smalltalk. In his first post to the weblog he mentions what he's been working on the past couple of years: more →
There's a dicussion on the concatenative mailing list about concatenative languages and macros. The discussion veered into pattern matching and Manfred Von Thun wrote about using pattern matching to implement common concatenative operations. I wrote previously about using pattern matching in Factor to do similar, calling the word 'shuffle'. For example, 2dup, could be implemented as: { ?a ?b }... more →