Intuitive and simple to use OCaml parsec
The following example shows how to design a parser capable of recognizing expressions such as those described here:
expr ::= integer (('+'|'-') expr)? | '(' expr ')'
module Parsec = Alda.Parser.Parsec (Alda.Source.FromChars)
let expr =
let open Alda.Parser.Core (Parsec) in
let open Alda.Parser.Literal (Parsec) in
let _OPERATOR_ = char_in_string "+-"
and _LPAR_ = char '('
and _RPAR_ = char ')' in
let operations expr = integer <+> opt (_OPERATOR_ <+> expr) >+> return ()
and parenthesis expr = _LPAR_ <+> expr <+> _RPAR_ >+> return () in
fix (fun expr -> operations expr <|> parenthesis expr)Calling the analyzer is then very simple and easy, as the following code fragment shows:
let main =
let open Alda.Source.Utils in
expr @@ Parsec.source (chars_of_string "+1+(-2+-3)") See Alda definition for more information.
MIT License
Copyright (c) 2023 Didier Plaindoux
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