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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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