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grammar MiniLisp
rule root
(expression)
end
rule expression
((space_p) "(" (space_p) (body) ")")
end
rule space_p
(space)0..1
end
rule body
((expression) / (identifier) / (float) / (integer) / (string))0..
end
rule space
\s1..
end
rule identifier
(([a-zA-Z=*] [a-zA-Z=*_]0..) (space_p))
end
rule float
(((integer) (("." [0-9]1..) / ("e" [0-9]1..))) (space_p))
end
rule integer
((("+" / "-")0..1 [0-9]1..) (space_p))
end
rule string
("\"" (("\\" .) / (!"\"" .))0.. "\"" (space_p))
end
end
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