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{- RequestMethod.hs -- how to request somebody's age off the Internet
Copyright (C) 2012 Benjamin Barenblat <benjamin@barenblat.name>
This module is a part of ageOf.
ageOf is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
ageOf is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
ageOf. If not, see <http://www.gnu.org/licenses/>. -}
module RequestMethod ( RequestMethod(..)
, getAge
) where
import Control.Applicative ((<$>))
import Data.Time
data RequestMethod = AgeFunction (String -> IO (Maybe Integer))
| BirthDateFunction (String -> IO (Maybe Day))
getAge :: RequestMethod -> String -> IO (Maybe Integer)
getAge (AgeFunction f) name = f name
getAge (BirthDateFunction f) name = do
today <- localDay <$> zonedTimeToLocalTime <$> getZonedTime
maybeDate <- f name
return $ diffYears today <$> maybeDate
diffYears :: Day -> Day -> Integer
new `diffYears` old =
let (oldYear, _, _) = toGregorian old
(newYear, _, _) = toGregorian new in
let yearsDelta = newYear - oldYear in
if addGregorianYearsRollOver yearsDelta old > new
then yearsDelta - 1
else yearsDelta
|
