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-----------------------------------------------------------------------------
-- |
-- Module : GHC.Lexeme
-- Copyright : (c) The GHC Team
--
-- Maintainer : ghc-devs@haskell.org
-- Portability : portable
--
-- Functions to evaluate whether or not a string is a valid identifier.
--
module GHC.Lexeme (
-- * Lexical characteristics of Haskell names
startsVarSym, startsVarId, startsConSym, startsConId,
startsVarSymASCII, isVarSymChar
) where
import Data.Char
startsVarSym, startsVarId, startsConSym, startsConId :: Char -> Bool
startsVarSym c = startsVarSymASCII c || (ord c > 0x7f && isSymbol c) -- Infix Ids
startsConSym c = c == ':' -- Infix data constructors
startsVarId c = c == '_' || case generalCategory c of -- Ordinary Ids
LowercaseLetter -> True
OtherLetter -> True -- See #1103
_ -> False
startsConId c = isUpper c || c == '(' -- Ordinary type constructors and data constructors
startsVarSymASCII :: Char -> Bool
startsVarSymASCII c = c `elem` "!#$%&*+./<=>?@\\^|~-"
isVarSymChar :: Char -> Bool
isVarSymChar c = c == ':' || startsVarSym c
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