I think we should probably make it possible to access the full string of a numeric literal in a macro but that is a substantial change to the parser.
On Monday, November 2, 2015, David P. Sanders <dpsand...@gmail.com> wrote: > > > El lunes, 2 de noviembre de 2015, 6:35:46 (UTC-6), Milan Bouchet-Valat > escribió: >> >> Le lundi 02 novembre 2015 à 00:58 -0800, Jeffrey Sarnoff a écrit : >> > I have many values like >> > 0.6584871727288045313850172023417636020375045372547107712468813403 >> > that come from Maple and I would like to avoid doing this by >> > copy/paste for each one: >> > Float128(parse(BigFloat,"0.658487172728804531385017202341763602037504 >> > 5372547107712468813403")) >> > >> > I tried writing a macro that would put quotes around the value and >> > then affix the rest -- without good result. >> > julia>@fromMaple >> > 0.6584871727288045313850172023417636020375045372547107712468813403 >> > Float128(parse(BigFloat,"0.658487172728804531385017202341763602037504 >> > 5372547107712468813403")) >> > >> > The REPL converts the unenquoted value to a Float64 before I get at >> > it. >> > >> > Help is appreciated. >> I don't think you can work around this at the moment. The best you can >> do is to define a non-standard string literal by creating a @f128_str >> macro, so that you can type these numbers as >> f128"0.6584871727288045313850172023417636020375045372547107712468813403 >> ". >> > > There is already a `big` macro: > > Float128(big"0.65848717272880453138501720234176360203750453725471077124688134") > > Instead of copying and pasting in the REPL, couldn't you write these > numbers to a file > and read them in as strings in Julia? > > There has been some discussion in the past about forwarding strings like > this to the parser > already wrapped in a macro (as is done for large integer values); I don't > recall what the > issue with this was. >
