Commit 67d22261 authored by Gabriel439's avatar Gabriel439 Committed by Ben Gamari

Derive Eq and Ord instance for SrcLoc and RealSrcLoc

The Eq and Ord instance were previously hand-written and this change
updates them to be automatically derived by the compiler.  The derived
behavior should be equivalent to the original.

Reviewers: hvr, austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1913
parent a6152159
......@@ -105,11 +105,12 @@ data RealSrcLoc
= SrcLoc FastString -- A precise location (file name)
{-# UNPACK #-} !Int -- line number, begins at 1
{-# UNPACK #-} !Int -- column number, begins at 1
deriving (Eq, Ord)
data SrcLoc
= RealSrcLoc {-# UNPACK #-}!RealSrcLoc
| UnhelpfulLoc FastString -- Just a general indication
deriving Show
deriving (Eq, Ord, Show)
{-
************************************************************************
......@@ -164,36 +165,9 @@ advanceSrcLoc (SrcLoc f l c) _ = SrcLoc f l (c + 1)
************************************************************************
-}
-- SrcLoc is an instance of Ord so that we can sort error messages easily
instance Eq SrcLoc where
loc1 == loc2 = case loc1 `cmpSrcLoc` loc2 of
EQ -> True
_other -> False
instance Eq RealSrcLoc where
loc1 == loc2 = case loc1 `cmpRealSrcLoc` loc2 of
EQ -> True
_other -> False
instance Ord SrcLoc where
compare = cmpSrcLoc
instance Ord RealSrcLoc where
compare = cmpRealSrcLoc
sortLocated :: [Located a] -> [Located a]
sortLocated things = sortBy (comparing getLoc) things
cmpSrcLoc :: SrcLoc -> SrcLoc -> Ordering
cmpSrcLoc (UnhelpfulLoc s1) (UnhelpfulLoc s2) = s1 `compare` s2
cmpSrcLoc (UnhelpfulLoc _) (RealSrcLoc _) = GT
cmpSrcLoc (RealSrcLoc _) (UnhelpfulLoc _) = LT
cmpSrcLoc (RealSrcLoc l1) (RealSrcLoc l2) = (l1 `compare` l2)
cmpRealSrcLoc :: RealSrcLoc -> RealSrcLoc -> Ordering
cmpRealSrcLoc (SrcLoc s1 l1 c1) (SrcLoc s2 l2 c2)
= (s1 `compare` s2) `thenCmp` (l1 `compare` l2) `thenCmp` (c1 `compare` c2)
instance Outputable RealSrcLoc where
ppr (SrcLoc src_path src_line src_col)
= hcat [ pprFastFilePath src_path <> colon
......
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