Source file alpha_string_literals.ml

open Core_kernel

open MParser

(** Assumes the left and right delimiter are the same, and that these can be
    escaped. Does not parse a string body containing newlines (as usual when
    escaping with \n) *)
module Escapable = struct
  module type S = sig
    val delimiter : string
    val escape : char
  end

  module Make (M : S) = struct
    (* delimiters can be escaped and parsing continues within the string body *)
    let escaped_char_s s =
      any_char s

    let char_token_s s =
      ((char M.escape >> escaped_char_s >>= fun c -> return (Format.sprintf {|%c%c|} M.escape c))
       <|> (any_char |>> String.of_char)
      )
        s

    let base_string_literal s =
      ((string M.delimiter >> (many_until char_token_s (string M.delimiter))
        |>> String.concat)
       >>= fun result ->
       return (Format.sprintf {|%s%s%s|} M.delimiter result M.delimiter)
      )
        s
  end
end

(** Quoted or raw strings. Allows different left and right delimiters, and
    disallows any sort of escaping. Does not support raw strings with identifiers
    yet, e.g., {blah|<string body>|blah} (OCaml) or delim`<string body>`delim
    syntax (Go) *)
module Raw = struct
  module type S = sig
    val left_delimiter : string
    val right_delimiter : string
  end

  module Make (M : S) = struct
    let char_token_s s =
      (any_char_or_nl |>> String.of_char) s

    let base_string_literal s =
      ((
        string M.left_delimiter >> (many_until char_token_s (string M.right_delimiter))
        |>> String.concat <?> "raw string literal body")
       >>= fun result ->
       return (Format.sprintf {|%s%s%s|} M.left_delimiter result M.right_delimiter)
      )
        s
  end
end