35 lines
1.1 KiB
OCaml
35 lines
1.1 KiB
OCaml
|
(* This module defines the sorts of markup recognised by the LIGO
|
||
|
|
lexer *)
|
||
|
|
|
||
|
|
module Region = Simple_utils.Region
|
||
|
|
|
||
|
|
(* A lexeme is piece of concrete syntax belonging to a token. In
|
||
|
|
algebraic terms, a token is also a piece of abstract lexical
|
||
|
|
syntax. Lexical units emcompass both markup and lexemes. *)
|
||
|
|
|
||
|
|
type lexeme = string
|
||
|
|
|
||
|
|
type t =
|
||
|
|
Tabs of int Region.reg (* Tabulations *)
|
||
|
|
| Space of int Region.reg (* Space *)
|
||
|
|
| Newline of lexeme Region.reg (* "\n" or "\c\r" escape characters *)
|
||
|
|
| LineCom of lexeme Region.reg (* Line comments *)
|
||
|
|
| BlockCom of lexeme Region.reg (* Block comments *)
|
||
|
|
| BOM of lexeme Region.reg (* Byte-Order Mark for UTF-8 (optional) *)
|
||
|
|
|
||
|
|
type markup = t
|
||
|
|
|
||
|
|
(* Pretty-printing of markup
|
||
|
|
|
||
|
|
The difference between [to_lexeme] and [to_string] is that the
|
||
|
|
former builds the corresponding concrete syntax (the lexeme),
|
||
|
|
whilst the latter makes up a textual representation of the abstract
|
||
|
|
syntax (the OCaml data constructors).
|
||
|
|
|
||
|
|
The result of [to_string] is escaped to avoid capture by the
|
||
|
|
terminal.
|
||
|
|
*)
|
||
|
|
|
||
|
|
val to_lexeme : t -> lexeme
|
||
|
|
val to_string : t -> ?offsets:bool -> [`Byte | `Point] -> string
|