Language::Basic and Language::Basic::Expression look promising (if you don't particularly want to write your own parser.
https://metacpan.org/pod/Language::Basic::Expression On 9 June 2014 13:10, James Laver <james.la...@gmail.com> wrote: > > On 9 Jun 2014, at 12:39, Abigail <abig...@abigail.be> wrote: > > > In short, Safe.pm may be the answer, but depending on who your users are, > > it may be overkill, or still contain too many hooks for an attacker. > > In short, if you trust the input, just eval() it, and if you don’t, you > want a parser. > > You might consider transforming it automatically into postfix notation and > building a really simple stack machine if you just want basic arithmetic > and placeholders. Otherwise, I can recommend Parse::RecDescent. Perhaps you > can be cheeky and get them to write some yaml like this: > > operation: + > with: > - 1 > - operation: - > - with: > - 2 > - operation: * > - with: [3,4] > > Not very user friendly, but very easy to work with. It depends how much > effort you’re willing to put in and whether you trust the input. > > James >
