[ruby-core:55611] [ruby-trunk - Feature #8430] Rational number literal

Issue #8430 has been updated by headius (Charles Nutter).


Not sure if the debate still rages, but something that keeps the numerator and denominator together in a single "literal" seems better to me. Why not add another % literal?

%R{1,2}

There's no other literals that are produced via a magic infix operator, and it seems confusing to me.
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Feature #8430: Rational number literal
https://bugs.ruby-lang.org/issues/8430#change-40100

Author: mrkn (Kenta Murata)
Status: Open
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: core
Target version: current: 2.1.0


I would like to propose a new literal syntax for rational numbers.
The implementation is available in my github repository:
https://github.com/mrkn/ruby/commit/8ca0c9a53593e55d67f509fc403df616e2276e3a

This patch implements a notation that consists of an integer, "//", and another integer, in a row.
The first integer is the numerator, and the second is the denominator.
Whitespaces are permitted between them.

For example:
    1 // 2 == Rational(1, 2)
    1 // 1 == Rational(1, 1)
    0 // 1 == Rational(0, 1)

"0 // 0" occurs syntax error.

I think this new syntax isn't conflict with an empty regexp
because this implementation doesn't treat // as a binary operator.



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