[Haskell-cafe] A Procedural-Functional Language (WIP)

Sun Oct 23 11:28:12 UTC 2016

Hi,

Seems interesting but I have difficulties to understand. Some concret example would help.

Your example could be done in Haskell using IO Monads.

Wouldn’t procedures be inlined as a compilation optimisation in Haskell ?

From my point of view your proposal will degrade code readability and wouldn’t improve efficiency of the execution.

As said earlier, I may have misunderstood. Feel free to correct me.

Regards,
Sven

On 23 Oct 2016, at 10:52, Rik Howard <rik at dcs.bbk.ac.uk<mailto:rik at dcs.bbk.ac.uk>> wrote:

Hi Richard

thank you for your reply.  It is becoming apparent that my explanation can be made clearer.  I'm investigating a language that takes something like core Haskell (a Lambda Calculus augmented with let blocks) to satisfy its pure function requirements but that takes a different approach when it comes to IO by employing procedures.

For IO, a procedure returns only 'okay' or an error via the mechanism that a function would use for returning values; the non-deterministic values returned by the procedure are done so with variable parameters.  For example, to define a procedure to echo once from standard in to out:

    echo = try (read string) (write string) error

The value coming from standard-in is to be captured in the 'string' out-variable and so is available to be written to standard-out, the 'try' built-in being analogous to 'if'.

Rough (inconsistent) examples exist; its grammar and type system are in a slightly better state but not yet written up properly.  What I could quickly add as an appendix, I have but the notation needs to be made more standard for easier comparison.  I am working on another paper that will address the need for a more-concrete and standard presentation.  I hope that this goes some way to answering your questions; please say if it doesn't!

Rik

On 22 October 2016 at 20:35, Richard Eisenberg <rae at cs.brynmawr.edu<mailto:rae at cs.brynmawr.edu>> wrote:
Hi Rik,

I'm unsure what to make of your proposal, as it's hard for me to glean out what you're proposing. Do you have some sample programs written in your proposed language? What is the language's grammar? What is its type system (stated in terms of inference rules)? Having these concrete descriptors of the language would be very helpful in assessing this work.

Richard

On Oct 22, 2016, at 8:18 AM, Rik Howard <rik at dcs.bbk.ac.uk<mailto:rik at dcs.bbk.ac.uk>> wrote:

Dear Haskell Cafe Subscribers

on the recommendation of someone for whom I have great respect, I have just subscribed to this list, it having been suggested as being a good place for me to get feedback regarding a project that I have been working on.  I am humbled by the level of discussion and it feels to be a very bold step for me to request anybody's time for my words.

The linked document is a four-page work-in-progress summary: the length being stipulated, potential novelty being the other main requirement.  Given the requirements, the summary necessarily glosses over some details and is not yet, I fear, completely correct.  The conclusion is, more or less, the one at which I am aiming; the properties are, more or less, the ones that are needed.

http://www.dcs.bbk.ac.uk/~rik/gallery/work-in-progress/document.pdf

The work arises from an investigation into functional programming syntax and semantics.  The novelty seems to be there but there is too a question as to whether it is simply a gimmick.  I try to suggest that it is not but, by that stage, there have been many assumptions so it is hard to be sure whether the suggestion is valid.  If anyone has any comments, questions or suggestions, they would be gratefully received.

Yours sincerely
Rik Howard

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Sven SAULEAU - Xtuc

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