[Haskell-cafe] Re: Scheme in Haskell, Parsec Example, how to add scheme comments

On Nov 18, 2007 7:32 PM, Berlin Brown wrote:

I am sure many of you have looked at the scheme in haskell example that is on the web by Jonathan Tang. If you are familiar with the code, I need a little help trying to add scheme style comments:

"; This is my comment"

I added this code here and I think it works (I replaced the name parseSpaces with his "spaces" function). But, if I start a line with a comment, it errors out with unbound variable. Anybody have any ideas?

-- Added the ';' symbol :: Parser Char symbol = oneOf ";!$%&|*+-/:<=>?@^_~#\n"

-- -- Handle whitespace and comments parseSpaces :: Parser () parseSpaces = (try oneLineComment) <|> whiteSpace <|> return () where whiteSpace = do skipMany1 space parseSpaces oneLineComment = do { try (string ";") ; skipMany (satisfy (/= '\n')) ; parseSpaces }

http://halogen.note.amherst.edu/~jdtang/scheme_in_48/tutorial/overview.html

Sorry, I am using the full scheme parser in this example: http://halogen.note.amherst.edu/~jdtang/scheme_in_48/scheme_in_48.zip -- Berlin Brown http://botspiritcompany.com/botlist/spring/help/about.html