X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fparser%2FLexer.x;h=e52880b64b9d671565a72a634410983fe172260f;hp=eab9419369d527311ffa41a74b236329891bff96;hb=9a82b1ffa35fa4c3927c66a1037a37d436cf6aac;hpb=83d563cb9ede0ba792836e529b1e2929db926355

diff --git a/compiler/parser/Lexer.x b/compiler/parser/Lexer.x
index eab9419..e52880b 100644
--- a/compiler/parser/Lexer.x
+++ b/compiler/parser/Lexer.x
@@ -32,6 +32,7 @@
 
 {
 -- XXX The above flags turn off warnings in the generated code:
+{-# LANGUAGE BangPatterns #-}
 {-# OPTIONS_GHC -fno-warn-unused-matches #-}
 {-# OPTIONS_GHC -fno-warn-unused-binds #-}
 {-# OPTIONS_GHC -fno-warn-unused-imports #-}
@@ -308,6 +309,10 @@ $tab+         { warn Opt_WarnTabs (text "Warning: Tab character") }
   \$ @varid / { ifExtension thEnabled }	{ skip_one_varid ITidEscape }
   "$("	    / { ifExtension thEnabled }	{ token ITparenEscape }
 
+-- For backward compatibility, accept the old dollar syntax
+  "[$" @varid "|"  / { ifExtension qqEnabled }
+                     { lex_quasiquote_tok }
+
   "[" @varid "|"  / { ifExtension qqEnabled }
                      { lex_quasiquote_tok }
 }
@@ -1102,10 +1107,12 @@ new_layout_context strict span _buf _len = do
     (AI l _) <- getInput
     let offset = srcLocCol l
     ctx <- getContext
+    relaxed <- extension relaxedLayout
+    let strict' = strict || not relaxed
     case ctx of
 	Layout prev_off : _  | 
-	   (strict     && prev_off >= offset  ||
-	    not strict && prev_off > offset) -> do
+	   (strict'     && prev_off >= offset  ||
+	    not strict' && prev_off > offset) -> do
 		-- token is indented to the left of the previous context.
 		-- we must generate a {} sequence now.
 		pushLexState layout_left
@@ -1756,6 +1763,8 @@ recBit :: Int
 recBit = 22 -- rec
 alternativeLayoutRuleBit :: Int
 alternativeLayoutRuleBit = 23
+relaxedLayoutBit :: Int
+relaxedLayoutBit = 24
 
 always :: Int -> Bool
 always           _     = True
@@ -1799,6 +1808,8 @@ oldQualOps :: Int -> Bool
 oldQualOps flags = not (newQualOps flags)
 alternativeLayoutRule :: Int -> Bool
 alternativeLayoutRule flags = testBit flags alternativeLayoutRuleBit
+relaxedLayout :: Int -> Bool
+relaxedLayout flags = testBit flags relaxedLayoutBit
 
 -- PState for parsing options pragmas
 --
@@ -1852,6 +1863,7 @@ mkPState flags buf loc =
                .|. rawTokenStreamBit `setBitIf` dopt Opt_KeepRawTokenStream flags
                .|. newQualOpsBit `setBitIf` xopt Opt_NewQualifiedOperators flags
                .|. alternativeLayoutRuleBit `setBitIf` xopt Opt_AlternativeLayoutRule flags
+               .|. relaxedLayoutBit `setBitIf` xopt Opt_RelaxedLayout flags
       --
       setBitIf :: Int -> Bool -> Int
       b `setBitIf` cond | cond      = bit b