#include "HsVersions.h"
+import {-# SOURCE #-} HsExpr( SyntaxExpr )
import Type ( Type )
-import Name ( Name )
-import HsTypes ( PostTcType )
import Outputable
import FastString
import Ratio ( Rational )
\begin{code}
data HsLit
- = HsChar Int -- Character
- | HsCharPrim Int -- Unboxed character
+ = HsChar Char -- Character
+ | HsCharPrim Char -- Unboxed character
| HsString FastString -- String
| HsStringPrim FastString -- Packed string
| HsInt Integer -- Genuinely an Int; arises from TcGenDeriv,
-- and from TRANSLATION
| HsIntPrim Integer -- Unboxed Int
- | HsInteger Integer -- Genuinely an integer; arises only from TRANSLATION
+ | HsInteger Integer Type -- Genuinely an integer; arises only from TRANSLATION
+ -- (overloaded literals are done with HsOverLit)
| HsRat Rational Type -- Genuinely a rational; arises only from TRANSLATION
+ -- (overloaded literals are done with HsOverLit)
| HsFloatPrim Rational -- Unboxed Float
| HsDoublePrim Rational -- Unboxed Double
- | HsLitLit FastString PostTcType -- to pass ``literal literals'' through to C
- -- also: "overloaded" type; but
- -- must resolve to boxed-primitive!
- -- The Type in HsLitLit is needed when desuaring;
- -- before the typechecker it's just an error value
instance Eq HsLit where
(HsChar x1) == (HsChar x2) = x1==x2
(HsStringPrim x1) == (HsStringPrim x2) = x1==x2
(HsInt x1) == (HsInt x2) = x1==x2
(HsIntPrim x1) == (HsIntPrim x2) = x1==x2
- (HsInteger x1) == (HsInteger x2) = x1==x2
+ (HsInteger x1 _) == (HsInteger x2 _) = x1==x2
(HsRat x1 _) == (HsRat x2 _) = x1==x2
(HsFloatPrim x1) == (HsFloatPrim x2) = x1==x2
(HsDoublePrim x1) == (HsDoublePrim x2) = x1==x2
- (HsLitLit x1 _) == (HsLitLit x2 _) = x1==x2
lit1 == lit2 = False
-data HsOverLit -- An overloaded literal
- = HsIntegral Integer Name -- Integer-looking literals;
- -- The name is fromInteger
- | HsFractional Rational Name -- Frac-looking literals
- -- The name is fromRational
+data HsOverLit id -- An overloaded literal
+ = HsIntegral Integer (SyntaxExpr id) -- Integer-looking literals;
+ | HsFractional Rational (SyntaxExpr id) -- Frac-looking literals
+ -- Before type checking, the SyntaxExpr is 'fromInteger' or 'fromRational'
+ -- After type checking, it is (fromInteger 3) or lit_78; that is,
+ -- the expression that should replace the literal.
+ -- This is unusual, because we're replacing 'fromInteger' with a call
+ -- to fromInteger. Reason: it allows commoning up of the fromInteger
+ -- calls, which wouldn't be possible if the desguarar made the application
-instance Eq HsOverLit where
+-- Comparison operations are needed when grouping literals
+-- for compiling pattern-matching (module MatchLit)
+instance Eq (HsOverLit id) where
(HsIntegral i1 _) == (HsIntegral i2 _) = i1 == i2
(HsFractional f1 _) == (HsFractional f2 _) = f1 == f2
+ l1 == l2 = False
-instance Ord HsOverLit where
+instance Ord (HsOverLit id) where
compare (HsIntegral i1 _) (HsIntegral i2 _) = i1 `compare` i2
compare (HsIntegral _ _) (HsFractional _ _) = LT
compare (HsFractional f1 _) (HsFractional f2 _) = f1 `compare` f2
ppr (HsString s) = pprHsString s
ppr (HsStringPrim s) = pprHsString s <> char '#'
ppr (HsInt i) = integer i
- ppr (HsInteger i) = integer i
+ ppr (HsInteger i _) = integer i
ppr (HsRat f _) = rational f
ppr (HsFloatPrim f) = rational f <> char '#'
ppr (HsDoublePrim d) = rational d <> text "##"
ppr (HsIntPrim i) = integer i <> char '#'
- ppr (HsLitLit s _) = hcat [text "``", ftext s, text "''"]
-instance Outputable HsOverLit where
+instance Outputable (HsOverLit id) where
ppr (HsIntegral i _) = integer i
ppr (HsFractional f _) = rational f
\end{code}
-
-