[project @ 2002-09-05 10:25:01 by simonmar]

In code style, print negative floating point literals in parentheses
to avoid interacting with surrounding syntax.

Fixes SourceForge bug #604849

MERGE TO STABLE

diff --git a/ghc/compiler/basicTypes/Literal.lhs b/ghc/compiler/basicTypes/Literal.lhs
index 45a3dc5..773ff74 100644 (file)
--- a/ghc/compiler/basicTypes/Literal.lhs
+++ b/ghc/compiler/basicTypes/Literal.lhs
@@ -392,10 +392,11 @@ pprLit lit
       MachWord64 w | code_style -> pprHexVal w
                   | otherwise  -> ptext SLIT("__word64") <+> integer w
 
-      MachFloat f | code_style -> ptext SLIT("(StgFloat)") <> rational f
+      MachFloat f | code_style -> ptext SLIT("(StgFloat)") <> code_rational f
                   | otherwise  -> ptext SLIT("__float") <+> rational f
 
-      MachDouble d -> rational d
+      MachDouble d | code_style -> code_rational d
+                  | otherwise  -> rational d
 
       MachAddr p | code_style -> ptext SLIT("(void*)") <> integer p
                 | otherwise  -> ptext SLIT("__addr") <+> integer p
@@ -408,6 +409,11 @@ pprLit lit
                                                     pprHsString s,
                                                     pprParendType ty])
 
+-- negative floating literals in code style need parentheses to avoid
+-- interacting with surrounding syntax.
+code_rational d | d < 0     = parens (rational d)
+                | otherwise = rational d
+
 pprIntVal :: Integer -> SDoc
 -- Print negative integers with parens to be sure it's unambiguous
 pprIntVal i | i < 0     = parens (integer i)