X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fparser%2FHaddockParse.y;h=d46223ddb3651ac5c6c72de8ba1baa874840bf5f;hb=4bc25e8c30559b7a6a87b39afcc79340ae778788;hp=d59195716c7ecb379b8cfd76fd529b280b9b52d7;hpb=70e996b9a6cd657d441cba95014304a588c0fd7c;p=ghc-hetmet.git

diff --git a/compiler/parser/HaddockParse.y b/compiler/parser/HaddockParse.y
index d591957..d46223d 100644
--- a/compiler/parser/HaddockParse.y
+++ b/compiler/parser/HaddockParse.y
@@ -6,7 +6,11 @@
 --     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
 -- for details
 
-module HaddockParse (parseHaddockParagraphs, parseHaddockString) where
+module HaddockParse (
+  parseHaddockParagraphs, 
+  parseHaddockString, 
+  EitherString(..)
+) where
 
 import {-# SOURCE #-} HaddockLex
 import HsSyn
@@ -21,6 +25,7 @@ import RdrName
 	']'     { TokDefEnd }
 	DQUO 	{ TokSpecial '\"' }
 	URL	{ TokURL $$ }
+	PIC     { TokPic $$ }
 	ANAME	{ TokAName $$ }
 	'/../'  { TokEmphasis $$ }
 	'-'	{ TokBullet }
@@ -30,7 +35,7 @@ import RdrName
 	PARA    { TokPara }
 	STRING	{ TokString $$ }
 
-%monad { Either String }
+%monad { EitherString }
 
 %name parseHaddockParagraphs  doc
 %name parseHaddockString seq
@@ -83,6 +88,7 @@ elem1	:: { HsDoc RdrName }
 	: STRING		{ DocString $1 }
 	| '/../'                { DocEmphasis (DocString $1) }
 	| URL			{ DocURL $1 }
+	| PIC                   { DocPic $1 }
 	| ANAME			{ DocAName $1 }
 	| IDENT			{ DocIdentifier $1 }
 	| DQUO strings DQUO	{ DocModule $2 }
@@ -92,16 +98,20 @@ strings  :: { String }
 	| STRING strings	{ $1 ++ $2 }
 
 {
-happyError :: [Token] -> Either String a
-happyError toks = 
---  Left ("parse error in doc string: "  ++ show (take 3 toks))
-  Left ("parse error in doc string")
-
--- Either monad (we can't use MonadError because GHC < 5.00 has
--- an older incompatible version).
-instance Monad (Either String) where
-	return        = Right
-	Left  l >>= _ = Left l
-	Right r >>= k = k r
-	fail msg      = Left msg
+happyError :: [Token] -> EitherString a
+happyError toks = MyLeft ("parse error in doc string")
+
+-- We don't want to make an instance for Either String,
+-- since every user of the GHC API would get that instance
+
+-- But why use non-Haskell98 instances when MyEither String
+-- is the only MyEither we're intending to use anyway? --Isaac Dupree
+--data MyEither a b = MyLeft a | MyRight b
+data EitherString b = MyLeft String | MyRight b
+
+instance Monad EitherString where
+	return          = MyRight
+	MyLeft  l >>= _ = MyLeft l
+	MyRight r >>= k = k r
+	fail msg        = MyLeft msg
 }