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|
{-# OPTIONS -fno-implicit-prelude #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.Unicde
-- Copyright : (c) The University of Glasgow, 2003
-- License : see libraries/base/LICENSE
--
-- Maintainer : cvs-ghc@haskell.org
-- Stability : internal
-- Portability : non-portable (GHC extensions)
--
-- Implementations for the character predicates (isLower, isUpper, etc.)
-- and the conversions (toUpper, toLower). The implementation uses
-- libunicode on Unix systems if that is available.
--
-----------------------------------------------------------------------------
module GHC.Unicode (
isAscii, isLatin1, isControl,
isAsciiUpper, isAsciiLower,
isPrint, isSpace, isUpper,
isLower, isAlpha, isDigit,
isOctDigit, isHexDigit, isAlphaNum,
toUpper, toLower,
) where
import GHC.Base
import GHC.Real (fromIntegral)
import GHC.Int
import GHC.Word
import GHC.Num (fromInteger)
#include "ghcconfig.h"
#include "HsBaseConfig.h"
-- | Selects the first 128 characters of the Unicode character set,
-- corresponding to the ASCII character set.
isAscii :: Char -> Bool
isAscii c = c < '\x80'
-- | Selects the first 256 characters of the Unicode character set,
-- corresponding to the ISO 8859-1 (Latin-1) character set.
isLatin1 :: Char -> Bool
isLatin1 c = c <= '\xff'
isAsciiUpper, isAsciiLower :: Char -> Bool
isAsciiLower c = c >= 'a' && c <= 'z'
isAsciiUpper c = c >= 'A' && c <= 'Z'
-- | Selects control characters, which are the non-printing characters of
-- the Latin-1 subset of Unicode.
isControl :: Char -> Bool
-- | Selects printable Unicode characters
-- (letters, numbers, marks, punctuation, symbols and spaces).
isPrint :: Char -> Bool
-- | Selects white-space characters in the Latin-1 range.
-- (In Unicode terms, this includes spaces and some control characters.)
isSpace :: Char -> Bool
-- isSpace includes non-breaking space
-- Done with explicit equalities both for efficiency, and to avoid a tiresome
-- recursion with GHC.List elem
isSpace c = c == ' ' ||
c == '\t' ||
c == '\n' ||
c == '\r' ||
c == '\f' ||
c == '\v' ||
c == '\xa0'
-- | Selects alphabetic Unicode characters (letters) that are not lower-case.
-- (In Unicode terms, this includes letters in upper and title cases,
-- as well as modifier letters and other letters.)
isUpper :: Char -> Bool
-- | Selects lower-case alphabetic Unicode characters (letters).
isLower :: Char -> Bool
-- | Selects alphabetic Unicode characters (letters).
--
-- Note: the Haskell 98 definition of 'isAlpha' is:
--
-- > isAlpha c = isUpper c || isLower c
--
-- the implementation here diverges from the Haskell 98
-- definition in the sense that Unicode alphabetic characters which
-- are neither upper nor lower case will still be identified as
-- alphabetic by 'isAlpha'.
isAlpha :: Char -> Bool
-- | Selects alphabetic or numeric digit Unicode characters.
--
-- Note that numeric digits outside the ASCII range are selected by this
-- function but not by 'isDigit'. Such digits may be part of identifiers
-- but are not used by the printer and reader to represent numbers.
isAlphaNum :: Char -> Bool
-- | Selects ASCII digits, i.e. @\'0\'@..@\'9\'@.
isDigit :: Char -> Bool
-- | Selects ASCII octal digits, i.e. @\'0\'@..@\'7\'@.
isOctDigit :: Char -> Bool
isOctDigit c = c >= '0' && c <= '7'
-- | Selects ASCII hexadecimal digits,
-- i.e. @\'0\'@..@\'9\'@, @\'a\'@..@\'f\'@, @\'A\'@..@\'F\'@.
isHexDigit :: Char -> Bool
isHexDigit c = isDigit c || c >= 'A' && c <= 'F' ||
c >= 'a' && c <= 'f'
-- | Convert a letter to the corresponding upper-case letter, leaving any
-- other character unchanged. Any Unicode letter which has an upper-case
-- equivalent is transformed.
toUpper :: Char -> Char
-- | Convert a letter to the corresponding lower-case letter, leaving any
-- other character unchanged. Any Unicode letter which has a lower-case
-- equivalent is transformed.
toLower :: Char -> Char
-- -----------------------------------------------------------------------------
-- Win32 implementation
#if (defined(HAVE_WCTYPE_H) && HAVE_ISWSPACE && defined(HTYPE_WINT_T)) || mingw32_TARGET_OS
-- Use the wide-char classification functions if available. Glibc
-- seems to implement these properly, even for chars > 0xffff, as long
-- as you call setlocale() to set the locale to something other than
-- "C". Therefore, we call setlocale() in hs_init().
-- Win32 uses UTF-16, so presumably the system-supplied iswlower() and
-- friends won't work properly with characters > 0xffff. These
-- characters are represented as surrogate pairs in UTF-16.
type WInt = HTYPE_WINT_T
type CInt = HTYPE_INT
isDigit c = iswdigit (fromIntegral (ord c)) /= 0
isAlpha c = iswalpha (fromIntegral (ord c)) /= 0
isAlphaNum c = iswalnum (fromIntegral (ord c)) /= 0
--isSpace c = iswspace (fromIntegral (ord c)) /= 0
isControl c = iswcntrl (fromIntegral (ord c)) /= 0
isPrint c = iswprint (fromIntegral (ord c)) /= 0
isUpper c = iswupper (fromIntegral (ord c)) /= 0
isLower c = iswlower (fromIntegral (ord c)) /= 0
toLower c = chr (fromIntegral (towlower (fromIntegral (ord c))))
toUpper c = chr (fromIntegral (towupper (fromIntegral (ord c))))
foreign import ccall unsafe "iswdigit"
iswdigit :: WInt -> CInt
foreign import ccall unsafe "iswalpha"
iswalpha :: WInt -> CInt
foreign import ccall unsafe "iswalnum"
iswalnum :: WInt -> CInt
foreign import ccall unsafe "iswcntrl"
iswcntrl :: WInt -> CInt
foreign import ccall unsafe "iswspace"
iswspace :: WInt -> CInt
foreign import ccall unsafe "iswprint"
iswprint :: WInt -> CInt
foreign import ccall unsafe "iswlower"
iswlower :: WInt -> CInt
foreign import ccall unsafe "iswupper"
iswupper :: WInt -> CInt
foreign import ccall unsafe "towlower"
towlower :: WInt -> WInt
foreign import ccall unsafe "towupper"
towupper :: WInt -> WInt
-- -----------------------------------------------------------------------------
-- No libunicode, so fall back to the ASCII-only implementation
#else
isControl c = c < ' ' || c >= '\DEL' && c <= '\x9f'
isPrint c = not (isControl c)
-- The upper case ISO characters have the multiplication sign dumped
-- randomly in the middle of the range. Go figure.
isUpper c = c >= 'A' && c <= 'Z' ||
c >= '\xC0' && c <= '\xD6' ||
c >= '\xD8' && c <= '\xDE'
-- The lower case ISO characters have the division sign dumped
-- randomly in the middle of the range. Go figure.
isLower c = c >= 'a' && c <= 'z' ||
c >= '\xDF' && c <= '\xF6' ||
c >= '\xF8' && c <= '\xFF'
isAlpha c = isLower c || isUpper c
isDigit c = c >= '0' && c <= '9'
isAlphaNum c = isAlpha c || isDigit c
-- Case-changing operations
toUpper c@(C# c#)
| isAsciiLower c = C# (chr# (ord# c# -# 32#))
| isAscii c = c
-- fall-through to the slower stuff.
| isLower c && c /= '\xDF' && c /= '\xFF'
= unsafeChr (ord c `minusInt` ord 'a' `plusInt` ord 'A')
| otherwise
= c
toLower c@(C# c#)
| isAsciiUpper c = C# (chr# (ord# c# +# 32#))
| isAscii c = c
| isUpper c = unsafeChr (ord c `minusInt` ord 'A' `plusInt` ord 'a')
| otherwise = c
#endif
|
