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Implemented functions for string: strtoupper, strtolower #2

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Mar 2, 2015
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Implemented functions for string: strtoupper, strtolower #2

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25 changes: 22 additions & 3 deletions StringFunctions.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,28 @@ import Tokenizer
import Evaluator
import Conversion
import Control.Monad.Error
import Data.Char

functions = [("strlen", phpStrLen)]
functions :: [(String, PHPFunctionType)]
functions = [ ("strlen", phpStrLen)
, ("strtoupper", phpStrToUpper)
, ("strtolower", phpStrToLower)]

-- Conversion of a PHPString for a Haskell [Char]
toHaskellStr :: PHPValue -> String
toHaskellStr x = stringFromPHPValue $ castToString x

-- Throws an arity error
arityErrorFor f = throwError $ Default $ "Wrong number of arguments to " ++ f

phpStrLen :: PHPFunctionType
phpStrLen (s:[]) = return $ PHPInt $ toInteger $ length $ stringFromPHPValue $ castToString s
phpStrLen _ = throwError $ Default "Wrong number of arguments to strlen"
phpStrLen (s:[]) = return $ PHPInt $ toInteger $ length $ toHaskellStr s
phpStrLen _ = arityErrorFor "strlen"

phpStrToUpper :: PHPFunctionType
phpStrToUpper (s:[]) = return $ PHPString $ map toUpper $ toHaskellStr s
phpStrToUpper _ = arityErrorFor "strtoupper"

phpStrToLower :: PHPFunctionType
phpStrToLower (s:[]) = return $ PHPString $ map toLower $ toHaskellStr s
phpStrToLower _ = arityErrorFor "strtolower"