New Month’s Resolutions: June 2012

My review of past month resolutions:

- AjContab in-memory model pending
- Add verbs in SetTuples pending
- Add features to Acquarella (extend by language, multi-line comments…) pending
- Add features to AjLogo in Javascript complete see repo
- Add features to AjTalk in Javascript complete see repo
- Add features to AjTalk .st to javascript compiler complete see repo
- Give a talk about implementing programming languages in Javascript complete blog post
- Start AjConsorSite coding (condo and real estate site) complete see repo

Instead of some of these, I did:

- Write Actor Model for NodeJs, SimpleActor complete see repo
- Improve AjLisp for NodeJs, Javascript complete see repo
- Write bidirectional JSON Message for NodeJs, SimpleMessages complete see repo
- Write first version AjGenesis for Node complete see repo
- Write first version AjGenesis for Ruby complete see repo
- Write first version SimpleTpl, template engine for NodeJs, Javascript complete see repo
- Write first version SimpleMvc, MVC on Express complete see repo
- Write first version SimpleModel, model in memory, for Javascript/Node.js complete see repo
- Write first version ProtoAppNode, prototyping a web application using a model complete see repo
- Improve my Node Samples complete see repo
- Improve my Programming Languages Samples complete see repo
- Add Bootstrap example to my CSS samples complete see repo
- Refactored AjFabriqNode complete see repo
- Write first version SimpleRemote, Remote Objects for NodeJs complete see repo

This new month resolutions:

- Write first version SimpleStore, simple key value store for NodeJs
- Start SimpleParser, PEG in Javascript
- Give a talk about developing an application using TDD in .NET
- Prepare a talk about Smalltalk Pharo
- Improve and publish SimpleRemote v0.0.1
- Improve and publish AjGenesisNode v0.0.1
- Prepare a talk about Ruby and Node.js
- Implement SimpleRemote client protocol in other language
- New examples for AjFabriqNode

Interesting topics. I will have fun!

Keep tuned!

Angel “Java” Lopez

http://www.ajlopez.com


http://twitter.com/ajlopez

Implementing Programming Languages in Javascript, JsConf Argentina

Today, May 20th, I will present programming languages implemented in Javascript, at JSConf Argentina 2012:

http://jsconf.com.ar/

(I wrote a post in Spanish announcing the conference)

This post contains the links and language implementations that I visited and prepared for the talk.

The presentation is in my Skydrive.

List of languages that compile to JSNew Page Edit Page Page History

https://github.com/jashkenas/coffee-script/wiki/List-of-languages-that-compile-to-JS

The JavaScript World Domination Plan at 16 Years

http://www.infoq.com/presentations/The-JavaScript-World-Domination-Plan-at-16-Years

Lisp as the Maxwell’s equations of software

http://www.michaelnielsen.org/ddi/lisp-as-the-maxwells-equations-of-software/

A Conversation with Alan Kay

http://queue.acm.org/detail.cfm?id=1039523

The Magnificent Seven
by Michael Fogus

http://fogus.me/static/preso/magnificent7/#slide1

McCarthy’s Lisp in Python with macros

https://github.com/fogus/lithp

The roots of Lisp

http://www.paulgraham.com/rootsoflisp.html

AjLisp in Javascript

https://github.com/ajlopez/AjLispJs

AjLogo in Javascript

https://github.com/ajlopez/AjLogoJs

Demo
http://ajlopez.github.com/AjLogoJs/demo.html

Other Logo implementations

http://www.calormen.com/Logo/


http://logo.twentygototen.org/

Clojurescript

https://github.com/clojure/clojurescript

AjTalk VM in C#, and compiler to Javascript

https://github.com/ajlopez/AjTalk

AjTalk in Javascript, bytecode VM, Javascript interpreter

https://github.com/ajlopez/AjTalkJs

Demo
http://ajlopez.github.com/AjTalkJs/demo.html

Amber

http://amber-lang.net/

Smalltalk S8, U8

http://u8.smalltalking.net/

Smalltalk S8 Console

http://u8.smalltalking.net/profile/smalltalking/125/index.html

My posts about AjTalk, AjLisp, AjLogo implementations

http://ajlopez.wordpress.com/category/ajtalk/


http://ajlopez.wordpress.com/category/ajlisp/


http://ajlopez.wordpress.com/category/ajlogo/

More examples, better readme.md, and posts are coming.

Keep tuned!

Angel “Java” Lopez

http://www.ajlopez.com


http://twitter.com/ajlopez

AjLogo in Javascript (1) First Implementation

This weekend, I was working on writing a Logo interpreter in Javascript. My open source project at:

https://github.com/ajlopez/AjLogoJs

My main reference is the Berkeley user manual:

http://www.cs.berkeley.edu/~bh/usermanual

I tested some expressions online using these implementation, in Javascript too:

http://logo.twentygototen.org/


http://www.calormen.com/Logo/

I only ran some expressions, without seeing their source code. I prefer to write my own implementation from scratch, applying TDD during the process. The current interpreter runs in the browser and under Node.js too. I could add some server-side example in the near future.

Initially, I thought I need to implement a List object, but Javascript array were enough to implements Logo list. During the coding, I realized that Javascript is a very good implementation language for a Logo interpreter. For example, Logo has a interesting behavior. Something like:

print myproc 1 2 myotherproc 3 4

could be interpreted in different ways, depending on the arity (expected number of arguments) of myproc, myotherproc. I implemented the primitive Logo procedures (like print, sum, make, etc…) as Javascript functions, so the arity is available as myfunc.length, nice!

When I needed to run a block (an array in Javascript), I could use an additional property block.compiled to cache a compiled version, thanks to Javascript support of dynamic properties. Javascript is really a flexible language.

Next steps:

- Implement parenthesis support (i.e. (sum 1 2 3 4) accepts four arguments, returning 10 as result)
- Binary infix operators, like +, –, etc… Now, I have sum, difference, multiply, quotient…
- More comparison predicates
- Property list procedures
- Turtle over a canvas

and I plan to add:

- Object support (defining methods like tobj move ant, where ant is the name of the prototype/class)
- Javascript native objects and functions access

I published a "try online" version at

http://www.ajlopez.com/ajlogojs

Keep tuned!

Angel “Java” Lopez

http://www.ajlopez.com


http://twitter.com/ajlopez