Re^2: S-expressions with Marpa::R2: Grammar for Numbers

Or, if you want to support the exponential notation, too:

number     ~ sign_maybe digit_many e
           | sign_maybe digit_any '.' digit_many e_maybe
           | sign_maybe digit_many e_maybe
           | sign_maybe non_zero digit_any

empty      ~
sign_maybe ~ [+-] | empty
digit      ~ [0-9]
non_zero   ~ [1-9]
digit_any  ~ digit*
digit_many ~ digit+
e          ~ [Ee] sign_maybe digit_many
e_maybe    ~ e | empty
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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

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Re^3: S-expressions with Marpa::R2: Grammar for Numbers by Fletch (Bishop) on Dec 23, 2025 at 15:41 UTC
Prior thread few years ago Parsing Emacs Lisp sexpr? where chorba had done Re: Parsing Emacs Lisp sexpr? which I had bookmarked. The cake is a lie. The cake is a lie. The cake is a lie.	[reply]