From 3f9b4e7855cf4594708a9fbad194c89540d2cf1e Mon Sep 17 00:00:00 2001
From: aarne <unknown>
Date: Wed, 31 Mar 2004 12:30:34 +0000
Subject: Added support for cf and ebnf formats

---
 src/GF/Infra/Comments.hs | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 src/GF/Infra/Comments.hs

(limited to 'src/GF/Infra/Comments.hs')

diff --git a/src/GF/Infra/Comments.hs b/src/GF/Infra/Comments.hs
new file mode 100644
index 000000000..442728b80
--- /dev/null
+++ b/src/GF/Infra/Comments.hs
@@ -0,0 +1,29 @@
+module Comments where
+
+-- comment removal : line tails prefixed by -- as well as chunks in {- ... -}
+
+remComments :: String -> String
+remComments s = 
+  case s of
+    '"':s2 -> '"':pass remComments s2 -- comment marks in quotes not removed!
+    '{':'-':cs -> readNested cs
+    '-':'-':cs -> readTail cs
+    c:cs -> c : remComments cs
+    [] -> []
+   where
+     readNested t = 
+       case t of
+         '"':s2 -> '"':pass readNested s2
+         '-':'}':cs -> remComments cs
+         _:cs -> readNested cs
+         [] -> []
+     readTail t = 
+       case t of
+         '\n':cs -> '\n':remComments cs
+         _:cs -> readTail cs
+         [] -> []
+     pass f t = 
+       case t of
+         '"':s2 -> '"': f s2
+         c:s2 -> c:pass f s2
+         _ -> t
-- 
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