On Fri, May 22, 2026 at 04:38:44AM +0200, Grégory Vanuxem wrote:
> Hello,
>
> Actually when an error is encountered during parsing and evaluation in
> parseAndEvalString and parseAndEvalStringEqNum the output is just:
> "error". I modified the throwed output to be the one of the interpreter.
> I may be wrong but nothing is affected (src/hyper/*, jFRiCAS or
> TeXmacs extensions). I just see one concern about
> the overhead but I believe for their use it
> is acceptable.
It seems to work well. I am thinking about assignment to algebra
output stream, it looks somewaht unclean.
> Below is to show here the mechanism:
>
> parseAndEvalToString str ==
> $collectOutput:local := true
> $outputLines: local := nil
> $IOindex: local := nil
> - v := CATCH('SPAD_READER, CATCH('top_level, parseAndEvalStr str))
> - v = 'restart => ['"error"]
> + str_stream := MAKE_-STRING_-OUTPUT_-STREAM()
> + old_stream := $algebra_out_rec.$stream_off
> + $algebra_out_rec.$stream_off := cons(false, str_stream)
> + v := UNWIND_-PROTECT(
> + CATCH('SPAD_READER, CATCH('top_level, parseAndEvalStr str)),
> + ($algebra_out_rec.$stream_off := old_stream)
> + )
> + captured_msg := GET_-OUTPUT_-STREAM_-STRING(str_stream)
> + v = 'restart =>
> + captured_msg = '"" => ['"Unknown error during parsing in BOOT
> function parseAndEvalToString"]
> + string2Lines(captured_msg)
> NREVERSE $outputLines
>
> Personally, I use these two functions for the FriCAS MCP server and
> therefore the FriCAS extension I am
> working on for the VS Code compatible editors. They have an integrated
> pseudo terminal which can be tightly related to the editor (think
> about a .input file you are working on).
>
> BTW, I always like informative error messages.
>
> Patch attached.
>
> Greg
>
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--
Waldek Hebisch
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