added function codePointFromChar (#92)

Author: csicar

src/Data/String/CodePoints.purs

@@ -8,6 +8,7 @@ module Data.String.CodePoints
   , codePointAt
   , codePointFromInt
   , codePointToInt
+  , codePointFromChar
   , count
   , drop
   , dropWhile
@@ -28,6 +29,7 @@ module Data.String.CodePoints
 import Prelude
 
 import Data.Array as Array
+import Data.Char (toCharCode)
 import Data.Char as Char
 import Data.Int (hexadecimal, toStringAs)
 import Data.Maybe (Maybe(Just, Nothing))
@@ -64,6 +66,16 @@ codePointFromInt n = Nothing
 codePointToInt :: CodePoint -> Int
 codePointToInt (CodePoint n) = n
 
+-- | Creates a CodePoint from a given Char.
+-- |
+-- | ```purescript
+-- | >>> codePointFromChar 'B'
+-- | CodePoint 0x42 -- represents 'B'
+-- | ```
+-- |  
+codePointFromChar :: Char -> CodePoint
+codePointFromChar = toCharCode >>> CodePoint
+
 unsurrogate :: Int -> Int -> CodePoint
 unsurrogate lead trail = CodePoint ((lead - 0xD800) * 0x400 + (trail - 0xDC00) + 0x10000)
 

test/Test/Data/String/CodePoints.purs

@@ -5,6 +5,7 @@ import Prelude
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)
 
+import Data.Char (fromCharCode)
 import Data.Maybe (Maybe(..), isNothing, maybe)
 import Data.String.CodePoints
 
@@ -35,6 +36,11 @@ testStringCodePoints = do
   assert $ codePointAt 6 str == (codePointFromInt 0x7A)
   assert $ codePointAt 7 str == Nothing
 
+  log "codePointFromChar"
+  assert $ Just (codePointFromChar 'A') == (codePointFromInt 65)
+  assert $ Just (codePointFromChar $ fromCharCode 0) == codePointFromInt 0
+  assert $ Just (codePointFromChar $ fromCharCode 0xFFFF) == codePointFromInt 0xFFFF
+
   log "count"
   assert $ count (\_ -> true) "" == 0
   assert $ count (\_ -> false) str == 0