Re: Problem with phrase/3: help examples not working

2014-02-12 19:05 GMT+01:00 Francisco José Gallego Durán <
[email protected]>:

> Thanks for your reply, Carlo :). That works fine on version 6.6.0, but it
> also fails on 6.2.6 as there is no string_codes/2.
>
Would it be a good idea to add a version number to predicates in help
> files, to know the version when they were implemented?
>

> In which way have double-quoted literals changed in version 7.x?
>
>
Double quoted strings are no longer (by default) lists of codes. Jan
changed the representation to a more efficient one.
The change has been discussed in depth previously on this list, but you can
refer to documentation about
extensions<http://www.swi-prolog.org/pldoc/man?section=extensions>for
a survey.
I keep my SWI-Prolog updated building from source, then I have no opinion
about versioning...

bye Carlo

Cheers,
> Fran.
>
>
> ----------------------------------------------------------------------------------------
> *Francisco José Gallego Durán*
> Dpto. de Ciencia de la Computación e Inteligencia Artificial // Universidad
> de Alicante
> (+34) 965903400 (Ext. 2073)
>
> ----------------------------------------------------------------------------------------
>
>
> 2014-02-12 13:04 GMT+01:00 Carlo Capelli <[email protected]>:
>
> Hi Fran
>>
>> integer//1 is defined in library(dcg/basics) and double quoted literals
>> have changed a lot in latest versions (7.x).
>>
>> ?- use_module(library(dcg/basics)).
>> %   library(pairs) compiled into pairs 0.00 sec, 22 clauses
>> %  library(lists) compiled into lists 0.02 sec, 122 clauses
>> % library(dcg/basics) compiled into dcg_basics 0.03 sec, 201 clauses
>> true.
>>
>> ?- string_codes("123 ready", Cs),phrase(integer(N),Cs,P).
>> Cs = [49, 50, 51, 32, 114, 101, 97, 100, 121],
>> N = 123,
>> P = [32, 114, 101, 97, 100, 121].
>>
>>
>> 2014-02-12 12:50 GMT+01:00 Francisco José Gallego Durán <
>> [email protected]>:
>>
>>> Hi everyone,
>>>
>>>    I am pretty new to this list, but I have been playing with prolog for
>>> several years and using Swi-Prolog quite a lot. (I implemented a game
>>> called PLMan<
>>> http://plman.i3a.ua.es/downloads/category/1-game?download=1%3Aplman>that
>>>
>>> we use to teach logic and prolog programming to our students at the
>>> University of Alicante).
>>>
>>>    I have a machine with Arch Linux and SWI 6.2.6 32bits multithreaded,
>>> and
>>> looked at help(phrase) to find this example:
>>>
>>> *    | ?- phrase(integer(X), "42 times", Rest).
>>>   |*
>>> *    | X = 42
>>>   |*
>>> *    ||Rest_=_[32,_116,_105,_109,_101,_115]____*
>>>
>>>
>>>
>>>    I copied it down to the interpreter and got this answer:
>>>
>>> *?- phrase(integer(X), "42 times", Rest).*
>>> *ERROR: phrase/3: Undefined procedure: integer/3*
>>> *ERROR:   However, there are definitions for:*
>>> *ERROR:         integer/1*
>>> *   Exception: (7) integer(_G550, [52, 50, 32, 116, 105, 109, 101, 115],
>>> _G578) ? *
>>>
>>>
>>>
>>>    Did I do something wrong, or is it just an outdated-help case?
>>>
>>>    I take this opportunity to thank Jan for his work in creating and
>>> maintaining SWI-Prolog. We have been using it for years and it has worked
>>> flawlessly :).
>>>
>>> Cheers,
>>> Fran.
>>>
>>>
>>> ----------------------------------------------------------------------------------------
>>> *Francisco José Gallego Durán*
>>>
>>> Dpto. de Ciencia de la Computación e Inteligencia Artificial //
>>> Universidad
>>> de Alicante
>>> (+34) 965903400 (Ext. 2073)
>>>
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>>
>>
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