Re: [Haskell-cafe] Parsing, infixes and on-the-fly precedence

Chris I thanked in private. Perhaps I should have done that publicly; it looks like the Parsec.Expr library is exactly what I need. Kim-Ee, yes, I believe that's exactly what I'm going for. On Mon, Sep 28, 2015 at 8:07 PM, Kim-Ee Yeoh wrote:

On Mon, Sep 28, 2015 at 2:28 PM, Jeffrey Brown wrote:

...

I imagine a parser that operates on (String,[String]) pairs, for which the second element allows the user to define precedence on the fly.

Let's use the Parser newtype

newtype Parser a = Parser { parse :: String -> [(a,String)] }

from

http://dev.stephendiehl.com/fun/002_parsers.html

as a basis for discussion.

Now you want to "operate on (String,[String]) pairs", so the Parser newtype must now look like this:

type MyInput = (String,[String])

newtype MyParser a = MyParser { parse :: MyInput -> [(a,MyInput)] }

Is this what you have in mind?

-- Kim-Ee

-- Jeffrey Benjamin Brown