Locale paramter for Integer(), Float(), Rational()
Matz' comment to my proposal on
Kernel#Boolean() (https://bugs.ruby-lang.org/issues/13260) led me to the idea of introducing an optional locale parameter (called under the name
allow in #13260). And now, I think that that idea can be applied generally to the
There seems to be constant demand to parse numbers written in different languages, and there is no official clean way to handle the problem. I thought we can let these methods take an optional locale parameter to allow inputs in different languages.
Float("4,294,967,295.0") # => 4294967295.0 English, by default Float("4,294,967,295.0", locale: "en") # => 4294967295.0 Float("4 294 967.295,0", locale: "de") # => 4294967295.0 Float("4 294 967 295,0", locale: "fr") # => 4294967295.0
Updated by duerst (Martin Dürst) about 3 years ago
I agree that it would be great to have such a facility. I'm not sure we need
locale:, we could just allow it as a second parameter (once we have made sure that there are no other suitable candidates for further parameters). I would personally start with 'output' functions (i.e.
to_s), because they are way more deterministic.
Please note that currently,
Float("4,294,967,295.0") throws an error, we may want (or not) to keep it that way, and only allow commas if a locale is explicitly set.
Also, we may want to create some kind of Locale object and allow this as a parameter. Also, we may want to allow more direct specification (e.g.
decimal_separator: ',', thousands_separator: '.'; but note that this isn't complete because in other locales (e.g. India), the separator will not separate thousands).