look ma, no laptops

The IFIP WG 2.16 (Language Design) has a flickr group for photos of the meetings.

This week the following question was posed (and not properly answered) on the Stratego/XT mailing list and came up independently in a discussion with Peter Mosses about the syntax of OCaml. I had seen the problem and a solution to it before. I think it was Martin Bravenboer who used it in the syntax of AspectJ; but I can't find the source.

The Problem

The expression

    x + if y then z + a

should be parsed to the following abstract syntax tree:

    Plus(Var("x"), If(Var("y"), Plus(Var("z"), Var("a"))))

The problem is that this cannot be solved directly using ambiguous binary expressions and just priorities and associativity declarations in SDF. But that does not mean there is no solution.

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I started using github last year for the code of my blog application. Now we have started the migration of source code of projects at the TU Delft SLDE group from existing subversion repositories to github as well. Rather than a big bang migration, we're incrementally moving projects over, starting with smaller libraries such as my elib library for WebDSL. We're collecting WebDSL projects in the webdsl organization. We'll be starting with the migration of the Spoofax/SDF/Stratego repositories in December. At least this move will relieve us of having to maintain our own subversion server (although this migration will take a while), and hopefully it will lower the barrier for external contributions.

The TU Delft Software Engineering Research Group SERG has an opening for a Assistant or Associate Professor in Software Engineering. Prospective candidates are invited to apply before December 13, 2012.

Full announcement

Candidates with a research interest in Domain-Specific Languages, Software Language Engineering, Language Workbenches are encouraged to apply.

Language workbenches have been segregated into those supporting textual languages and those supporting visual languages. The projectional editor based MPS has been making some first steps in combining text-like projections and more graphical projections. In the Spoofax project we have stayed away from visual languages. (There is plenty to do in supporting design of textual languages well.) Until this year.

In the Spring of 2012 TU Delft student Oskar van Rest started his Master's thesis project at the University of Queensland (Australia). He has been working on the integration of visual languages in the Spoofax Language Workbench. As case study of the integration he constructed ComBE:

ComBE provides an integrated textual and graphical editor for Behavior Engineering. It synchronises text and graphics in real-time and allows you to switch between editors at any moment in time.

He recently presented a poster about the project and created a screencast showing off the side-by-side editing of text and diagram.

Update 24/3/2013: paper Robust Real-Time Synchronization between Textual and Graphical Editors to appear in ICMT 2013

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