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definition:
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readParen :: Bool -> ReadS a -> ReadS a
readParen b g = if b then mandatory else optional
where optional r = g r ++ mandatory r
mandatory r =
[(x, u) | ("(", s) <- lex r, (x, t) <- optional s, (")", u) <- lex t]
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demand:
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argument 1
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deterministic:
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deterministic operation
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documentation:
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--- `readParen True p` parses what `p` parses, but surrounded with parentheses.
--- `readParen False p` parses what `p` parses, but the string to be parsed
--- can be optionally with parentheses.
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failfree:
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(_, _)
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indeterministic:
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referentially transparent operation
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infix:
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no fixity defined
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iotype:
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{({True},_) |-> {readParen.mandatory.75} || ({False},_) |-> {readParen.optional.75}}
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name:
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readParen
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precedence:
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no precedence defined
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result-values:
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{readParen.mandatory.75,readParen.optional.75}
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signature:
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Bool -> ([Char] -> [(a, [Char])]) -> [Char] -> [(a, [Char])]
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solution-complete:
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operation might suspend on free variables
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terminating:
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possibly non-terminating
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totally-defined:
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possibly non-reducible on same data term
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