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Diffstat (limited to 'RequestMethod.hs')
-rw-r--r-- | RequestMethod.hs | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/RequestMethod.hs b/RequestMethod.hs new file mode 100644 index 0000000..0828b13 --- /dev/null +++ b/RequestMethod.hs @@ -0,0 +1,42 @@ +{- 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 |