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According to the ISO core standard, it is allowed to dynamically
create clauses of a predicate, even if it doesn't have a dynamic
declaration. assertz/1 and friends are allowed to do this.

But since it is implicit dynamic, it should then be retrievable
via the clause/2 builtin. Currrently I get the following:

1. Press Save in the Menu of the sandbox.
2. A nice dialog box is show asking for Title and Description
3. Now, I do not want to save what I did, but want to continue writing my program
4. Neither [Escape] work, nor I see any Cancel box.
5. So I am now forced to give up what I did or do an unnecessary save

I get this errror:

Also chrome kind of halts when the right margin of the query field is reached.

Hi,

I tried code that does indent through write, by
adding spaces in front of the text. But it didn't work.

Was more expecting as output display:

abc
  def
ghi

Bye

I need to output text to the sandbox query console, either with write or format. Write output the text as a list and write("Testtext") returns [T,e,s,t,t,e,x,t] for example, isnstead of "Testtext".
I don´t get format to work at all.

How can I output strings as strings with write, or format in the sandbox?

I was playing around with the Tau Prolog sandbox. My expectation
was to gain some information whether an export/1 directive
exists or not. If it exists I wouldn't see an error, and if it doesn't
exists I would get some error. Neither happens right now:

(This problem does not exist under Mobile Chrome)

When entering text for an interactive query, typing space cancels the entire line of text typed so far.

This used to work some time ago.

Firefox Version 66.0.2

TauProlog has a new interfaces:

promiseQuery: queries a goal and returns a promise that is resolved
when the goal loads successfully, or rejected when there is an error. It
takes the same arguments as the query method.
http://tau-prolog.org/manual/promises-interface

The test case was a large limit and then:

longrunning :- 
    between(1,300,_),
    between(1,300,_),
    between(1,300,_),
    fail.
longrunning.

But I find that this sandbox here is blocking:

http://tau-prolog.org/sandbox/

Is there another sandbox already online?

This works fine:

?- hilbert((p->p), X, 2).
X = 'ax-mp'('ax-mp'('ax-2','ax-1',(p->(_114->__115->_114)->p)),
'ax-mp'('ax-1','ax-1',(_114->__115->_114)),(p->_114->__115->_114)) ;
parsing query: hilbert((p->p),X,2) ok!

But when I forget the parenthesis around p->p, it redirects me to GitHub:

?- hilbert(p->p, X, 2).
javascript error: TypeError: try_answer(...) is undefined
Report error on GitHub
error parsing query:throw(error(syntax_error(', or ) expected'),[line(1),column(9),found(->)]))

I am more expecting a parsing error without a JavaScript error.

Would it be possible to allow write inside the sandbox?
Currently these ISO core standard predicates are simply
not recognized:

But interestingly SWISH allows them;

Enter the query:

I=1,N is 1 <<I.

And Tau responds with:

?- I=1,N is 1 <

So everything behind the < is eaten by HTML (in the HTML source, the first < is written as < and the second is not).