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ploc
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(********************************************************************)
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(* *)
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(* The LustreC compiler toolset / The LustreC Development Team *)
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(* Copyright 2012 - -- ONERA - CNRS - INPT *)
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(* *)
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(* LustreC is free software, distributed WITHOUT ANY WARRANTY *)
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(* under the terms of the GNU Lesser General Public License *)
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(* version 2.1. *)
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(* *)
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(********************************************************************)
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90e83deb
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Lélio Brun
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open Utils.Format
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module I = Parser_lustre_table.MenhirInterpreter
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a2327c71
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Lélio Brun
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module Inc = Parser_lustre_table.Incremental
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90e83deb
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Lélio Brun
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module E = MenhirLib.ErrorReports
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module L = MenhirLib.LexerUtil
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xthirioux
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Lélio Brun
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exception Error
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04a63d25
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xthirioux
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Lélio Brun
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type start_symbol = Header | Program
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Lélio Brun
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Lélio Brun
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(* [env checkpoint] extracts a parser environment out of a checkpoint, which
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must be of the form [HandlingError env]. *)
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90e83deb
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Lélio Brun
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let env checkpoint =
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Lélio Brun
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match checkpoint with I.HandlingError env -> env | _ -> assert false
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90e83deb
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Lélio Brun
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(* [state checkpoint] extracts the number of the current state out of a
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checkpoint. *)
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let state checkpoint : int =
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match I.top (env checkpoint) with
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| Some (I.Element (s, _, _, _)) ->
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I.number s
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| None ->
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ca7ff3f7
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Lélio Brun
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(* Hmm... The parser is in its initial state. The incremental API currently
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lacks a way of finding out the number of the initial state. It is usually
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0, so we return 0. This is unsatisfactory and should be fixed in the
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future. *)
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0
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90e83deb
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Lélio Brun
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ca7ff3f7
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Lélio Brun
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(* [show text (pos1, pos2)] displays a range of the input text [text] delimited
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by the positions [pos1] and [pos2]. *)
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90e83deb
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Lélio Brun
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let show text positions =
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Lélio Brun
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E.extract text positions |> E.sanitize |> E.compress |> E.shorten 20
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(* max width 43 *)
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90e83deb
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Lélio Brun
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Lélio Brun
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(* (\* [get text checkpoint i] extracts and shows the range of the input text that
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* corresponds to the [i]-th stack cell. The top stack cell is numbered zero. *\)
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* let get text checkpoint i =
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* match I.get i (env checkpoint) with
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* | Some (I.Element (_, _, pos1, pos2)) ->
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* show text (pos1, pos2)
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* | None ->
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* (\* The index is out of range. This should not happen if [$i]
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* keywords are correctly inside the syntax error message
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* database. The integer [i] should always be a valid offset
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* into the known suffix of the stack. *\)
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* "???" *)
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Lélio Brun
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module type LEXER = sig
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val token : Lexing.lexbuf -> Parser_lustre.token
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Lélio Brun
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type error
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exception Error of Location.t * error
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val pp_error : formatter -> error -> unit
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end
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let reparse (module Lexer : LEXER) ?orig_loc filename start src =
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Lélio Brun
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(* Allocate and initialize a lexing buffer. *)
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let lexbuf = L.init filename (Lexing.from_string src) in
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(* Wrap the lexer and lexbuf together into a supplier, that is, a function of
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type [unit -> token * position * position]. *)
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Lélio Brun
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let supplier = I.lexer_lexbuf_to_supplier Lexer.token lexbuf in
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Lélio Brun
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(* Equip the supplier with a two-place buffer that records the positions of
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the last two tokens. This is useful when a syntax error occurs, as these
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are the token just before and just after the error. *)
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Lélio Brun
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let buffer, supplier = E.wrap_supplier supplier in
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(* Fetch the parser's initial checkpoint. *)
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Lélio Brun
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let checkpoint = start lexbuf.lex_curr_p in
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Lélio Brun
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(* [succeed v] is invoked when the parser has succeeded and produced a
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semantic value [v]. In our setting, this cannot happen, since the
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Lélio Brun
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table-based parser is invoked only when we know that there is a syntax
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error in the input file. *)
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Lélio Brun
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let succeed _v = assert false in
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(* [fail checkpoint] is invoked when parser has encountered a syntax error. *)
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let fail (checkpoint : _ I.checkpoint) =
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(* Indicate where in the input file the error occurred. *)
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Lélio Brun
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let loc = E.last buffer in
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Lélio Brun
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let loc =
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match orig_loc with Some loc' -> Location.shift loc' loc | _ -> loc
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in
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90e83deb
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Lélio Brun
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(* Show the tokens just before and just after the error. *)
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Lélio Brun
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let indication = E.show (show src) buffer in
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Lélio Brun
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(* Fetch an error message from the database. *)
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let message = Parser_lustre_messages.message (state checkpoint) in
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(* Expand away the $i keywords that might appear in the message. *)
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Lélio Brun
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(* let message = E.expand (get src checkpoint) message in *)
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Lélio Brun
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(* Show these three components. *)
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Lélio Brun
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eprintf "@[<v>%aSyntax error %s.@,%s@]@." Location.pp_loc loc indication
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message;
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Lélio Brun
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raise Error
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in
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(* Run the parser. *)
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Lélio Brun
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(* We do not handle [Lexer.Error] because we know that we will not encounter a
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lexical error during this second parsing run. *)
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90e83deb
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Lélio Brun
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I.loop_handle succeed fail supplier checkpoint
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ca7ff3f7
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Lélio Brun
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let parse (module Lexer : LEXER) ?orig_loc filename src lexbuf start_mono
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start_incr =
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let lexbuf = L.init filename lexbuf in
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Lélio Brun
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try start_mono Lexer.token lexbuf with
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Lélio Brun
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| Lexer.Error (loc, err) ->
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Lélio Brun
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let loc =
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match orig_loc with Some loc' -> Location.shift loc' loc | _ -> loc
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in
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eprintf "@[<v>%aSyntax error.@,%a@]@." Location.pp_loc loc Lexer.pp_error
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err;
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raise Error
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| Parser_lustre.Error ->
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reparse (module Lexer) ?orig_loc filename start_incr src
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ploc
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a2327c71
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Lélio Brun
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let parse_filename (module Lexer : LEXER) filename start =
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Lélio Brun
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let start_mono, start_incr =
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match start with
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| Header ->
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Parser_lustre.header, Inc.header
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| Program ->
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Parser_lustre.prog, Inc.prog
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in
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let src, lexbuf = L.read filename in
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Location.set_input filename;
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parse (module Lexer) filename src lexbuf start_mono start_incr
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ploc
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(* Local Variables: *)
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(* compile-command:"make -C .." *)
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(* End: *)
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