Professor Fish

SE talk at Chalmers,  Gothenburg , Sweden An ontological approach to technology documentation Room 473 / Wed March 1 - 11:00 - 12:00 .    Speaker: Ralf Lämmel, University of Koblenz-Landau Abstract : In this talk, I am going to present an ontological approach to software technology documentation. That is, usage scenarios of a technology (such as an object/relational mapper, a web-application framework, or a model transformation) are captured in terms of the involved entities (e.g., artifacts, languages, abstract processes, programming paradigms, functions, and function applications) and the relationships between them (e.g., membership, conformance, transformation, usage, and reference). I am going to discuss language and tool support for and experiences with developing such technology documentation. In the SoftLang team at Koblenz, we work on the related but broader notion of "linguistic software architecture" or "megamodeling". I will briefly discu...

FP talk at Chalmers, Gothenburg , Sweden The Haskell Road to Software Language Engineering and Metaprogramming 2017-02-24 , 10.00, conference room 8103, Rännvägen 6, Johanneberg.    Speaker: Ralf Lämmel, University of Koblenz-Landau Abstract : In this talk, I would like to sketch my upcoming textbook on software languages  http://www.softlang. org/book  while putting on the hat of a Haskell programmer. Overall, the book addresses many issues of software language engineering and metaprogramming: internal and external DSLs, object-program representation, parsing, template processing, pretty printing, interpretation, compilation, type checking, software analysis, software transformation, rewriting, attribute grammars, partial evaluation, program generation, abstraction interpretation, concrete object syntax, and a few more. Haskell plays a major role in the book in that Haskell is used for the implementation for all kinds of language processors, ...

I am happy to be done with the draft of the software language book. Just sent it off to Springer for the final verdict/review. Please find the book's frontmatter (including table of contents, preface, and acknowledgment) as well as the first technical chapter ("The notion of software language") online: http://www.softlang.org/book If you like to review the draft book or use it already in class room, please get in touch. The draft is sent to Springer and I hope to receive Springer's Ok+input within three months and finalize the book accordingly no later than May 2017. While under review and further scrutiny, I am going to perform self-motivated proof-reading and fine tuning. (There are some obvious dimensions for the final mile: index, exercises, English, formatting, clarity, bibliography.) I am going to have a sabbatical Mid of February - End of October 2017. I am super-über-motivated to visit a few places, give guest lectures drawn from the book, and discuss ...

Deleting this post as it superseded by newer updates.

It just so happens that I needed global variables in some Prolog code. In fact, I needed more carefully scoped global variables. SWI-Prolog's global variables are really global. (Well, they are thread-scoped, for what it matters.) This is not good, if you need a lot of global variables and maybe even in different parts of an application. An uninspiring approach would be to fabricate global variable names in a manner that they are scoped internally by some name prefix. It was more fun to achieve scope by means of actually using one truly global variable to provide many scoped variables. Here is a demo: ?- logvars:get(myscope, a, X). true. ?- logvars:get(myscope, a, Y). true. ?- logvars:get(myscope, a, X), logvars:get(myscope, a, Y). X = Y . ?- logvars:get(myscope, a, X), logvars:get(myscope, b, Y). true . Here is the code: https://github.com/softlang/yas/blob/master/lib/Prolog/logvars.pro Inlined below: % (C) 2016 Ralf Laemmel :- module...

While having fun at UvA in A'dam by means of teaching Haskell in a pre-master summer school, I also manage to walk across the street to see folks at CWI. Will be giving a presentation on coupled transformations and megamodeling. Title : Megamodels of Coupled Transformations Abstract : Many software engineering contexts involve a collection of coupled artifacts, i.e., changing one artifact may challenge consistency between artifacts of the collection. A coupled software transformation (CX) is meant to transform one or more artifacts of such a collection while preserving consistency. There are many forms of coupling—depending on technological space and application domain and solution approach. We axiomatize and illustrate important forms of coupling within the Prolog-based software language repository YAS (Yet Another SLR (Software Language Repository)) while relying on a higher-level predicate logic-based megamodeling language LAL for axiomatization and a lower-level megamo...

Deleting this post as it superseded by newer updates.