Separate NondecreasingIndentation out into its own extension

[ghc-hetmet.git] / compiler / parser / Lexer.x

diff --git a/compiler/parser/Lexer.x b/compiler/parser/Lexer.x
index 2e17b8f..6b73981 100644 (file)
--- 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 #-}
@@ -140,7 +141,7 @@ haskell :-
 
 -- everywhere: skip whitespace and comments
 $white_no_nl+                          ;
-$tab+         { warn Opt_WarnTabs (text "Tab character") }
+$tab+         { warn Opt_WarnTabs (text "Warning: Tab character") }
 
 -- Everywhere: deal with nested comments.  We explicitly rule out
 -- pragmas, "{-#", so that we don't accidentally treat them as comments.
@@ -210,7 +211,7 @@ $tab+         { warn Opt_WarnTabs (text "Tab character") }
 -- context if the curly brace is missing.
 -- Careful! This stuff is quite delicate.
 <layout, layout_do> {
-  \{ / { notFollowedBy '-' }           { pop_and open_brace }
+  \{ / { notFollowedBy '-' }           { hopefully_open_brace }
        -- we might encounter {-# here, but {- has been handled already
   \n                                   ;
   ^\# (line)?                          { begin line_prag1 }
@@ -308,6 +309,10 @@ $tab+         { warn Opt_WarnTabs (text "Tab character") }
   \$ @varid / { ifExtension thEnabled }        { skip_one_varid ITidEscape }
   "$("     / { ifExtension thEnabled } { token ITparenEscape }
 
+-- For backward compatibility, accept the old dollar syntax
+  "[$" @varid "|"  / { ifExtension qqEnabled }
+                     { lex_quasiquote_tok }
+
   "[" @varid "|"  / { ifExtension qqEnabled }
                      { lex_quasiquote_tok }
 }
@@ -452,6 +457,7 @@ data Token
   | ITdynamic
   | ITsafe
   | ITthreadsafe
+  | ITinterruptible
   | ITunsafe
   | ITstdcallconv
   | ITccallconv
@@ -596,6 +602,7 @@ isSpecial ITlabel           = True
 isSpecial ITdynamic    = True
 isSpecial ITsafe       = True
 isSpecial ITthreadsafe         = True
+isSpecial ITinterruptible = True
 isSpecial ITunsafe     = True
 isSpecial ITccallconv   = True
 isSpecial ITstdcallconv = True
@@ -658,6 +665,7 @@ reservedWordsFM = listToUFM $
        ( "dynamic",    ITdynamic,       bit ffiBit),
        ( "safe",       ITsafe,          bit ffiBit),
        ( "threadsafe", ITthreadsafe,    bit ffiBit),  -- ToDo: remove
+       ( "interruptible", ITinterruptible, bit ffiBit),
        ( "unsafe",     ITunsafe,        bit ffiBit),
        ( "stdcall",    ITstdcallconv,   bit ffiBit),
        ( "ccall",      ITccallconv,     bit ffiBit),
@@ -749,6 +757,19 @@ pop :: Action
 pop _span _buf _len = do _ <- popLexState
                          lexToken
 
+hopefully_open_brace :: Action
+hopefully_open_brace span buf len
+ = do relaxed <- extension relaxedLayout
+      ctx <- getContext
+      (AI l _) <- getInput
+      let offset = srcLocCol l
+          isOK = relaxed ||
+                 case ctx of
+                 Layout prev_off : _ -> prev_off < offset
+                 _                   -> True
+      if isOK then pop_and open_brace span buf len
+              else failSpanMsgP span (text "Missing block")
+
 pop_and :: Action -> Action
 pop_and act span buf len = do _ <- popLexState
                               act span buf len
@@ -1099,10 +1120,12 @@ new_layout_context strict span _buf _len = do
     (AI l _) <- getInput
     let offset = srcLocCol l
     ctx <- getContext
+    nondecreasing <- extension nondecreasingIndentation
+    let strict' = strict || not nondecreasing
     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
@@ -1753,6 +1776,10 @@ recBit :: Int
 recBit = 22 -- rec
 alternativeLayoutRuleBit :: Int
 alternativeLayoutRuleBit = 23
+relaxedLayoutBit :: Int
+relaxedLayoutBit = 24
+nondecreasingIndentationBit :: Int
+nondecreasingIndentationBit = 25
 
 always :: Int -> Bool
 always           _     = True
@@ -1796,6 +1823,10 @@ oldQualOps :: Int -> Bool
 oldQualOps flags = not (newQualOps flags)
 alternativeLayoutRule :: Int -> Bool
 alternativeLayoutRule flags = testBit flags alternativeLayoutRuleBit
+relaxedLayout :: Int -> Bool
+relaxedLayout flags = testBit flags relaxedLayoutBit
+nondecreasingIndentation :: Int -> Bool
+nondecreasingIndentation flags = testBit flags nondecreasingIndentationBit
 
 -- PState for parsing options pragmas
 --
@@ -1849,6 +1880,8 @@ 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
+               .|. nondecreasingIndentationBit `setBitIf` xopt Opt_NondecreasingIndentation flags
       --
       setBitIf :: Int -> Bool -> Int
       b `setBitIf` cond | cond      = bit b