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Re: DCG restrictions on the left-hand side [Novacore]

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This was discussed here:

Definite Clause Grammars Harmonization Proposal
Last edit jschimpf? October 20, 2016, at 12:42 AM
https://eclipseclp.org/wiki/Prolog/DCG

Not sure why Scryer Prolog doesn't implement it.

Mild Shock schrieb:
> 
> In Novacore we are lucky, its a side effect of
> phrase translating the head and a multi-file check:
> 
> ?- [user].
> p;q --> r.
> Fehler: Kann Prädikat ;/2 nicht umdefinieren, nicht als Mehrdateien 
> markiert.
> 
> But might work out differently if a DCG is expanded
> and asserted. Ok, its actually not so bad:
> 
> ?- expand_term((p;q --> r), X), assertz(X).
> Fehler: Kann Prädikat ;/2 nicht aktualisieren.
>      user auf 1
> 
> 
> Mild Shock schrieb:
>> Guess how many newer Prolog systems allow this here:
>>
>> ?- [user].
>> p;q --> r.
>>     true.
>>
>> On the other hand SWI-Prolog disallows it:
>>
>> ?- [user].
>> p;q --> r.
>>
>> ERROR: user://1:29:
>> ERROR:    No permission to define dcg_nonterminal `p;q'
> 

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Thread

DCG restrictions on the left-hand side [Novacore] Mild Shock <janburse@fastmail.fm> - 2024-07-30 20:39 +0200
  Re: DCG restrictions on the left-hand side [Novacore] Mild Shock <janburse@fastmail.fm> - 2024-07-30 20:43 +0200
    Re: DCG restrictions on the left-hand side [Novacore] Mild Shock <janburse@fastmail.fm> - 2024-07-30 20:45 +0200
      Re: DCG restrictions on the left-hand side [Novacore] Mild Shock <janburse@fastmail.fm> - 2024-07-31 07:55 +0200
        Re: DCG restrictions on the left-hand side [Novacore] Mild Shock <janburse@fastmail.fm> - 2024-07-31 08:07 +0200
  post-N246 Read- and Write-Option variable_names/1 (Was: DCG restrictions on the left-hand side [Novacore]) Mild Shock <janburse@fastmail.fm> - 2024-08-10 20:20 +0200
    Re: post-N246 Read- and Write-Option variable_names/1 (Was: DCG restrictions on the left-hand side [Novacore]) Mild Shock <janburse@fastmail.fm> - 2024-08-10 20:33 +0200
      Is a PIP for Syntax extensions necessary? (Was; post-N246 Read- and Write-Option variable_names/1) Mild Shock <janburse@fastmail.fm> - 2024-08-11 00:02 +0200
        Re: Is a PIP for Syntax extensions necessary? (Was; post-N246 Read- and Write-Option variable_names/1) Mild Shock <janburse@fastmail.fm> - 2024-08-11 00:05 +0200
          Re: Is a PIP for Syntax extensions necessary? (Was; post-N246 Read- and Write-Option variable_names/1) Mild Shock <janburse@fastmail.fm> - 2024-08-11 00:16 +0200
            Re: Is a PIP for Syntax extensions necessary? (Was; post-N246 Read- and Write-Option variable_names/1) Mild Shock <janburse@fastmail.fm> - 2024-08-11 00:25 +0200
              Re: Is a PIP for Syntax extensions necessary? (Was; post-N246 Read- and Write-Option variable_names/1) Mild Shock <janburse@fastmail.fm> - 2024-08-11 14:46 +0200
  A PIP classification scheme is needed (Was: DCG restrictions on the left-hand side [Novacore]) Mild Shock <janburse@fastmail.fm> - 2024-08-13 11:18 +0200
    Re: A PIP classification scheme is needed (Was: DCG restrictions on the left-hand side [Novacore]) Mild Shock <janburse@fastmail.fm> - 2024-08-13 11:23 +0200
      Re: A PIP classification scheme is needed (Was: DCG restrictions on the left-hand side [Novacore]) Mild Shock <janburse@fastmail.fm> - 2024-08-13 13:08 +0200

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