I'm attempting to parse lisp-style comments from an s-expression language with FParsec. I got a bit of help with parsing single-line comments in this previous thread - How to convert an FParsec parser to parse whitespace
While that was resolved, I still need to parse multiline comments. Here's the current code -
/// Read whitespace character as a string.
let spaceAsStr = anyOf whitespaceChars |>> fun chr -> string chr
/// Read a line comment.
let lineComment = pchar lineCommentChar >>. restOfLine true
/// Read a multiline comment.
/// TODO: make multiline comments nest.
let multilineComment =
between
(pstring openMultilineCommentStr)
(pstring closeMultilineCommentStr)
(charsTillString closeMultilineCommentStr true System.Int32.MaxValue)
/// Read whitespace text.
let whitespace =
lineComment <|>
multilineComment <|>
spaceAsStr
/// Skip any white space characters.
let skipWhitespace = skipMany whitespace
/// Skip at least one white space character.
let skipWhitespace1 = skipMany1 whitespace
Unfortunately, the multilineComment parse never succeeds. Since this is a combinator, I can't put breakpoints or analyze why it won't work.
Any ideas why it won't work?
Try changing the bool argument for
closeMultilineCommentStr
to falseOtherwise it will skip over the
closeMultilineCommentStr
string.To make it work with nested comments