99 lines
2.7 KiB
OCaml
99 lines
2.7 KiB
OCaml
(** Generic parser for LIGO *)
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module type PARSER =
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sig
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(* The type of tokens *)
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type token
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(* This exception is raised by the monolithic API functions *)
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exception Error
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(* The monolithic API *)
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val contract : (Lexing.lexbuf -> token) -> Lexing.lexbuf -> AST.t
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(* The incremental API *)
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module MenhirInterpreter :
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sig
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include MenhirLib.IncrementalEngine.INCREMENTAL_ENGINE
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with type token = token
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end
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module Incremental :
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sig
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val contract : Lexing.position -> AST.t MenhirInterpreter.checkpoint
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end
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end
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(* Errors *)
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module type PAR_ERR =
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sig
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val message : int -> string (* From error states to messages *)
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end
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let format_error ?(offsets=true) mode Region.{region; value} ~file =
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let reg = region#to_string ~file ~offsets mode in
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Printf.sprintf "\027[31mParse error %s:\n%s\027[0m%!" reg value
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(* Main functor *)
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module Make (Lexer: Lexer.S)
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(Parser: PARSER with type token = Lexer.Token.token)
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(ParErr: PAR_ERR) =
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struct
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type message = string
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type valid = Lexer.token
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type invalid = Lexer.token
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exception Point of message * valid option * invalid
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module I = Parser.MenhirInterpreter
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module S = MenhirLib.General (* Streams *)
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(* The call [stack checkpoint] extracts the parser's stack out of
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a checkpoint. *)
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let stack = function
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I.HandlingError env -> I.stack env
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| _ -> assert false
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(* The call [state checkpoint] extracts the number of the current
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state out of a parser checkpoint. *)
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let state checkpoint : int =
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match Lazy.force (stack checkpoint) with
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S.Nil -> 0 (* WARNING: Hack. The first state should be 0. *)
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| S.Cons (I.Element (s,_,_,_),_) -> I.number s
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(* The parser has successfully produced a semantic value. *)
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let success v = v
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(* The parser has suspended itself because of a syntax error. Stop. *)
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let failure get_win checkpoint =
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let message = ParErr.message (state checkpoint) in
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match get_win () with
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Lexer.Nil -> assert false
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| Lexer.One invalid ->
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raise (Point (message, None, invalid))
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| Lexer.Two (invalid, valid) ->
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raise (Point (message, Some valid, invalid))
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(* The generic parsing function *)
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let incr_contract Lexer.{read; buffer; get_win; close; _} : AST.t =
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let supplier = I.lexer_lexbuf_to_supplier read buffer
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and failure = failure get_win in
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let parser = Parser.Incremental.contract buffer.Lexing.lex_curr_p in
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let ast = I.loop_handle success failure supplier parser
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in close (); ast
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let mono_contract = Parser.contract
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end
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