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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %
% Frown --- An LALR(k) parser generator for Haskell 98 %
% Copyright (C) 2001-2005 Ralf Hinze %
% %
% This program is free software; you can redistribute it and/or modify %
% it under the terms of the GNU General Public License (version 2) as %
% published by the Free Software Foundation. %
% %
% This program 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 this program; see the file COPYING. If not, write to %
% the Free Software Foundation, Inc., 59 Temple Place - Suite 330, %
% Boston, MA 02111-1307, USA. %
% %
% Contact information %
% Email: Ralf Hinze <ralf@cs.uni-bonn.de> %
% Homepage: http://www.informatik.uni-bonn.de/~ralf/ %
% Paper mail: Dr. Ralf Hinze %
% Institut für Informatik III %
% Universität Bonn %
% Römerstraße 164 %
% 53117 Bonn, Germany %
% %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> module Atom ( SrcLoc(..), showLoc
> , Ident, ident, identAt, prime, string, isPrimed, identSrcLoc
> , Literal, numeral, charLit, stringLit, numeralAt, charLitAt, stringLitAt, litSrcLoc )
> where
> import Prettier hiding ( string )
> import qualified Prettier as PP
> data SrcLoc = At Int Int
> | Unknown
> deriving (Show)
>
> instance Pretty SrcLoc where
> prettyPrec _d (At ln col) = PP.string (showLoc ln col)
> prettyPrec _d Unknown = PP.string "<unknown>"
>
> showLoc :: Int -> Int -> String
> showLoc line col = "(line " ++ show line ++ ", column " ++ show col ++ ")"
%-------------------------------= --------------------------------------------
\section{Identifier}
%-------------------------------= --------------------------------------------
> data Ident = Ident String SrcLoc
> | Prime Ident
>
> instance Eq Ident where
> Ident s1 _ == Ident s2 _ = s1 == s2
> Prime i1 == Prime i2 = i1 == i2
> _ == _ = False
>
> instance Ord Ident where
> compare (Ident s1 _) (Ident s2 _)
> = compare s1 s2
> compare (Ident _ _) (Prime _)
> = LT
> compare (Prime _) (Ident _ _)
> = GT
> compare (Prime i1) (Prime i2)
> = compare i1 i2
>
> instance Show Ident where
> showsPrec d (Ident s _) = showParen (d > 9) (showString "ident " . shows s)
> showsPrec d (Prime i) = showParen (d > 9) (showString "prime " . showsPrec 10 i)
>
> instance Pretty Ident where
> prettyPrec _d (Ident s _) = PP.string s
> prettyPrec d (Prime i) = prettyPrec d i <> char '\''
>
> ident :: String -> Ident
> ident s = Ident s Unknown
>
> identAt :: String -> SrcLoc -> Ident
> identAt s loc = Ident s loc
>
> prime :: Ident -> Ident
> prime i = Prime i
>
> string :: Ident -> String
> string (Ident s _) = s
> string (Prime i) = string i
>
> isPrimed :: Ident -> Bool
> isPrimed (Prime _i) = True
> isPrimed _ = False
>
> identSrcLoc :: Ident -> SrcLoc
> identSrcLoc (Ident _ loc) = loc
> identSrcLoc (Prime i) = identSrcLoc i
%-------------------------------= --------------------------------------------
\section{Literal}
%-------------------------------= --------------------------------------------
> data Literal = Numeral String SrcLoc
> | Char String SrcLoc
> | String String SrcLoc
>
> str :: Literal -> String
> str (Numeral s _) = s
> str (Char s _) = s
> str (String s _) = s
>
> instance Eq Literal where
> l1 == l2 = str l1 == str l2
>
> instance Ord Literal where
> compare l1 l2 = compare (str l1) (str l2)
>
> instance Show Literal where
> showsPrec d (Numeral s _) = showParen (d > 9) (showString "numeral " . shows s)
> showsPrec d (Char s _) = showParen (d > 9) (showString "charLit " . shows s)
> showsPrec d (String s _) = showParen (d > 9) (showString "stringLit " . shows s)
>
> instance Pretty Literal where
> prettyPrec _d (Numeral s _) = PP.string s
> prettyPrec _d (Char s _) = PP.string s
> prettyPrec _d (String s _) = PP.string s
>
> numeral, charLit, stringLit :: String -> Literal
> numeral s = Numeral s Unknown
> charLit s = Char s Unknown
> stringLit s = String s Unknown
>
> numeralAt, charLitAt, stringLitAt :: String -> SrcLoc -> Literal
> numeralAt s loc = Numeral s loc
> charLitAt s loc = Char s loc
> stringLitAt s loc = String s loc
>
> litSrcLoc :: Literal -> SrcLoc
> litSrcLoc (Numeral _ loc) = loc
> litSrcLoc (Char _ loc) = loc
> litSrcLoc (String _ loc) = loc
|
