Hi, (I lost a mail. Hopefully this doesn’t end up in a double post).
I got it working and made a ticket to get into a more structured working mode. :) nix-instantiate --eval -E '123.45 * 1E2' 12345 If anyone wants to follow up: https://github.com/NixOS/nix/issues/760 Happy to do whatever is necessary to wrap this up. :) Cheers, Christian > On 05 Jan 2016, at 00:48, Christian Theune <[email protected]> wrote: > > Hi, > > alright. I was really interested in trying to see whether I can figure out > what’s going on. > > I didn’t quite get it working today and my lack of Flex/Bison understanding > is blocking me from figuring out what’s going on. :/ > > Most changes were done by reviewing everything that touched the integer > handling and following all traces of all things it touched. > > My current work is here: > https://github.com/NixOS/nix/compare/master...ctheune:ctheune-floats?expand=1 > > For some reason, the lexer seems to fail picking up the FLOAT symbol _at all_ > and complains: > > nix-instantiate --eval -E '123.1' > error: syntax error, unexpected INT, expecting ID or OR_KW or DOLLAR_CURLY or > '"', at (string):1:5 > > So it notices the first thing as an INT (I think, it might be a float, but I > don’t think so) but the “.” seems to be interpreted as the attribute access > operator. I didn’t find the rule for this - can someone point this out to me? > > Overall, I hope I didn’t make too much of a mess. I picked up a few little > things along the way that I think warranted a quick correction (NixInt vs. > regular int references and using a custom parser instead of stoi - or should > that be stol?). > > If someone could help me figure out what I’m butchering in the Lexer (or > elsewhere) … > > Cheers, > Christian > >> On 04 Jan 2016, at 17:27, Eelco Dolstra <[email protected]> wrote: >> >> Hi, >> >> On 04/01/16 17:12, Rok Garbas wrote: >> >>> should we add this to nixpkgs/lib? it is usefull (using it right now) :) >> >> IMHO, it would be cleaner to add floats to the Nix language. Before somebody >> decides to implement floating point arithmetic using a bunch of regexps ;-) >> >> -- >> Eelco Dolstra | LogicBlox, Inc. | http://nixos.org/~eelco/ >> _______________________________________________ >> nix-dev mailing list >> [email protected] >> http://lists.science.uu.nl/mailman/listinfo/nix-dev > > -- > Christian Theune · [email protected] · +49 345 219401 0 > Flying Circus Internet Operations GmbH · http://flyingcircus.io > Forsterstraße 29 · 06112 Halle (Saale) · Deutschland > HR Stendal HRB 21169 · Geschäftsführer: Christian. Theune, Christian. > Zagrodnick > -- Christian Theune · [email protected] · +49 345 219401 0 Flying Circus Internet Operations GmbH · http://flyingcircus.io Forsterstraße 29 · 06112 Halle (Saale) · Deutschland HR Stendal HRB 21169 · Geschäftsführer: Christian. Theune, Christian. Zagrodnick
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