Import the Sexp parser generator (#608)
This commit is contained in:
Jérémie Dimino
GitHub
parent
338f4c9ff2
commit
8e4c9fce4c
3
Makefile
3
Makefile
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@ -54,5 +54,8 @@ livedoc:
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update-jbuilds: $(BIN)
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$(BIN) build --dev @doc/runtest --auto-promote
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update-sexp-parser:
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$(BIN) build --dev @update-sexp-parser --auto-promote
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.PHONY: default install uninstall reinstall clean test doc
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.PHONY: promote accept-corrections
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@ -0,0 +1,112 @@
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(* Parsing of S-expression. The parsing is written as an automaton for which
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we provide different implementations of actions.
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*)
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open Base
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open Stdio
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open Gen_parsexp_lib.Automaton
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open Gen_parsexp_lib.Automaton.Table
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(* Sharing of transitions *)
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module Sharing = struct
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let create_assign_id () =
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let cache = Hashtbl.Poly.create () in
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(cache,
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fun x ->
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if not (Hashtbl.mem cache x) then
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Hashtbl.add_exn cache ~key:x ~data:(Hashtbl.length cache))
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let share (table : t) =
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let transitions, assign_transition_id =
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create_assign_id ()
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in
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let transitions_eoi, assign_transition_eoi_id =
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create_assign_id ()
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in
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Array.iter table.transitions ~f:assign_transition_id;
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Array.iter table.transitions_eoi ~f:assign_transition_eoi_id;
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(transitions, transitions_eoi)
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end
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let gen_code oc (t : t) =
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let (named_transitions, named_transitions_eoi) = Sharing.share t in
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let pr fmt = Out_channel.fprintf oc (Caml.(^^) fmt "\n") in
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pr "(* generated by %s *)" Caml.Sys.argv.(0);
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pr "";
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pr "open Parser_automaton_internal";
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pr "";
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pr "let raise = Parser_automaton_internal.Error.raise";
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pr "";
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let ordered_ids tbl =
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Hashtbl.fold tbl ~init:[] ~f:(fun ~key:x ~data:id acc -> (id, x) :: acc)
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|> List.sort ~cmp:(fun (id1, _) (id2, _) -> compare id1 id2)
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in
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List.iter (ordered_ids named_transitions)
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~f:(fun (id, tr) ->
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match tr with
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| Error error ->
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pr "let tr_%02d _state _char _stack =" id;
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pr " raise _state ~at_eof:false %s" (Error.to_string error)
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| Ok { action = (eps_actions, action); goto; advance } ->
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let eps_actions =
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List.filter_map ~f:Epsilon_action.to_runtime_function eps_actions
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in
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let action = Action.to_runtime_function action in
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pr "let tr_%02d state %schar stack =" id
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(if Option.is_none action &&
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not ([%compare.equal: goto_state] goto End_block_comment) then
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"_"
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else
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"");
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List.iter eps_actions ~f:(pr " let stack = %s state stack in");
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(match action with
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| None -> ()
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| Some s -> pr " let stack = %s state char stack in" s);
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(match goto with
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| State n -> pr " set_automaton_state state %d;" n
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| End_block_comment ->
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pr " let stack = end_block_comment state char stack in";
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pr " set_automaton_state state \
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(if block_comment_depth state <> 0 then %d else %d);"
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(State.to_int (Block_comment Normal)) (State.to_int Whitespace));
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pr " %s state;"
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(match advance with
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| Advance -> "advance"
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| Advance_eol -> "advance_eol");
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pr " stack"
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);
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pr "";
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List.iter (ordered_ids named_transitions_eoi) ~f:(fun (id, tr) ->
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match tr with
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| Error error ->
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pr "let tr_eoi_%02d state _stack =" id;
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pr " raise state ~at_eof:true %s" (Error.to_string error)
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| Ok eps_actions ->
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pr "let tr_eoi_%02d state stack =" id;
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let eps_actions =
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List.filter_map eps_actions ~f:Epsilon_action.to_runtime_function
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in
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List.iter eps_actions ~f:(pr " let stack = %s state stack in");
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pr " eps_eoi_check state stack");
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pr "";
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let pr_table ?(per_line=1) suffix tbl ids =
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pr "let transitions%s =" suffix;
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let len = Array.length tbl in
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let lines = len / per_line in
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assert (per_line * lines = len);
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for l = 0 to lines - 1 do
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Out_channel.fprintf oc (if l = 0 then " [|" else " ;");
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for col = 0 to per_line - 1 do
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if col > 0 then Out_channel.fprintf oc ";";
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let i = l * per_line + col in
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Out_channel.fprintf oc " tr%s_%02d" suffix (Hashtbl.find_exn ids tbl.(i))
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done;
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Out_channel.fprintf oc "\n"
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done;
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pr " |]";
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pr "";
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in
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pr_table "" t.transitions named_transitions ~per_line:8;
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pr_table "_eoi" t.transitions_eoi named_transitions_eoi
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let () = gen_code Caml.stdout table
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@ -0,0 +1,4 @@
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(executable
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((name gen_parser_automaton)
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(libraries (base stdio gen_parsexp_lib))
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(preprocess (pps (ppx_sexp_conv ppx_compare)))))
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@ -0,0 +1,383 @@
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(* Abstract version of the parsing automaton.
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It is used in two places:
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- to define the automaton. At runtime, we only use integer for states and a table of
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functions for transitions
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- for tests
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*)
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open Base
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module State = struct
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module Quoted_string = struct
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type t =
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| Normal
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| After_backslash
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| After_backslash_cr
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| After_backslash_digit
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| After_backslash_2digits
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| After_backslash_x
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| After_backslash_x_hex
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| Ignoring_blanks
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[@@deriving enumerate, compare, sexp_of]
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end
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module Block_comment = struct
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type t =
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| Normal
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| After_pipe
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| After_hash
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| Quoted_string of Quoted_string.t
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[@@deriving enumerate, compare, sexp_of]
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end
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module Unquoted_string = struct
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type t =
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| Normal
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| After_hash
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| After_pipe
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[@@deriving enumerate, compare, sexp_of]
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end
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type t =
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| Whitespace
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| Error
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| After_cr
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| Unquoted_string of Unquoted_string.t
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| Line_comment
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| After_hash
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| Quoted_string of Quoted_string.t
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| Block_comment of Block_comment.t
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[@@deriving enumerate, compare, sexp_of]
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let to_int t =
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let rec loop i t l =
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match l with
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| [] -> assert false
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| x :: l -> if [%compare.equal: t] t x then i else loop (i + 1) t l
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in
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loop 0 t all
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let of_int i = List.nth_exn all i
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let count = List.length all
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let initial = to_int Whitespace
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let () = assert (initial = 0) (* This is assumed in parser_automaton_internal.ml *)
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let () = assert (to_int Error = 1) (* This is assumed in parser_automaton_internal.ml *)
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let old_parser_approx_cont_state = function
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| Whitespace -> "Parsing_toplevel_whitespace"
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| After_cr -> "Parsing_nested_whitespace"
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| Unquoted_string _
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| Quoted_string _ -> "Parsing_atom"
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| After_hash -> "Parsing_atom"
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| Block_comment _ -> "Parsing_block_comment"
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| Line_comment -> "Parsing_toplevel_whitespace"
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(* This cannot happen with the old parser so the result is a dummy value *)
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| Error -> "Parsing_toplevel_whitespace"
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end
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module Error = struct
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(* Subset of the [Parser_automaton_internal.Public.Error.Reason.t] type *)
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type t =
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| Unexpected_char_parsing_hex_escape
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| Unexpected_char_parsing_dec_escape
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| Unterminated_quoted_string
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| Unterminated_block_comment
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| Comment_token_in_unquoted_atom
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| Unexpected_character_after_cr
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| Automaton_in_error_state
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[@@deriving compare, sexp_of, hash, variants]
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let to_string = Variants.to_name
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end
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(* Action associated to transitions. Actions correspond to the similarly named functions
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in ../parser_automaton_internal.mli. *)
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module Action = struct
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type t =
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| Nop
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| Opening
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| Closing
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| Add_atom_char
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| Add_quoted_atom_char
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| Add_first_char
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| Add_escaped
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| Add_hex_escape_char
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| Add_dec_escape_char
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| Add_last_hex_escape_char
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| Add_last_dec_escape_char
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| Add_token_char
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| Comment_add_last_dec_escape_char
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| Push_quoted_atom
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| Start_quoted_string
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| Start_block_comment
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| Start_sexp_comment
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| Start_line_comment
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[@@deriving compare, sexp_of, hash, variants]
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let to_runtime_function = function
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| Nop -> None
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| t -> Some (String.uncapitalize (Variants.to_name t))
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end
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(* Action associated to epsilon transitions, i.e. transitions that do not consume a
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character.
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Having epsilon actions makes the definition of the automaton much simpler. *)
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module Epsilon_action = struct
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type t =
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| Nop
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| Push_atom
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| Add_first_char_hash
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| Add_escaped_cr
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| End_line_comment
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[@@deriving compare, sexp_of, hash, variants]
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let to_runtime_function = function
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| Nop -> None
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| End_line_comment -> Some "end_line_comment"
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| t -> Some ("eps_" ^ String.uncapitalize (Variants.to_name t))
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end
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module Transition = struct
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type t =
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| T of Action.t * State.t
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| E of Epsilon_action.t * State.t
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| Error of Error.t
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| End_block_comment (* can't be a normal transition, as the new state isn't known
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statically *)
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[@@deriving compare]
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end
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module Final_transition = struct
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type t =
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| Eoi_check
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| E of Epsilon_action.t * State.t
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| Error of Error.t
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end
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module type Automaton = sig
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val transition : State.t * char -> Transition.t
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val transition_eoi : State.t -> Final_transition.t
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end
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(* Definition of the automaton, compiled later to a transition table. *)
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module Automaton : Automaton = struct
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module Quoted_string_transition = struct
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type t =
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| T of Action.t * State.Quoted_string.t
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| E of Epsilon_action.t * State.Quoted_string.t
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| Error of Error.t
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| End_of_quoted_string
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end
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type context = In_block_comment | In_atom
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let quoted_string_transition
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: context -> State.Quoted_string.t * char -> Quoted_string_transition.t
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= fun context x ->
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(* Distinguising atom and block comments is to optimize block comments. But
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we musn't optimize the exception on things like \321. *)
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let if_atom then_ else_ : Action.t =
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match context with
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| In_atom -> then_
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| In_block_comment -> else_
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in
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let if_atom_eps then_ else_ : Epsilon_action.t =
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match context with
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| In_atom -> then_
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| In_block_comment -> else_
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in
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match x with
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| Normal, '"' -> End_of_quoted_string
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| Normal, '\\' -> T (Add_token_char, After_backslash)
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| Normal, _ -> T (if_atom Add_quoted_atom_char Add_token_char, Normal)
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| After_backslash, '\n' ->
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T (Add_token_char, Ignoring_blanks)
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| After_backslash, '\r' ->
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T (Add_token_char, After_backslash_cr)
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| After_backslash, 'x' ->
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T (Add_token_char, After_backslash_x)
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| After_backslash, '0'..'9' ->
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T (Add_dec_escape_char, After_backslash_digit)
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| After_backslash, _ ->
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T (if_atom Add_escaped Add_token_char, Normal)
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| After_backslash_cr, '\n' ->
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T (Add_token_char, Ignoring_blanks)
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| After_backslash_cr, _ ->
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E (if_atom_eps Add_escaped_cr Nop, Normal)
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| After_backslash_x, ('0'..'9' | 'a'..'f' | 'A'..'F') ->
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T (if_atom Add_hex_escape_char Add_token_char , After_backslash_x_hex)
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| After_backslash_x, _ ->
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Error Unexpected_char_parsing_hex_escape
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| After_backslash_x_hex, ('0'..'9' | 'a'..'f' | 'A'..'F') ->
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T (if_atom Add_last_hex_escape_char Add_token_char, Normal)
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| After_backslash_x_hex, _ ->
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Error Unexpected_char_parsing_hex_escape
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| After_backslash_digit, '0'..'9' ->
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T (Add_dec_escape_char, After_backslash_2digits)
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| After_backslash_digit, _ ->
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Error Unexpected_char_parsing_dec_escape
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| After_backslash_2digits, '0'..'9' ->
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T (if_atom Add_last_dec_escape_char Comment_add_last_dec_escape_char, Normal)
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| After_backslash_2digits, _ ->
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Error Unexpected_char_parsing_dec_escape
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| Ignoring_blanks, (' '|'\t') ->
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T (Add_token_char, Ignoring_blanks)
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| Ignoring_blanks, _ ->
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E (Nop, Normal)
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module Block_comment_transition = struct
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type t =
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| T of Action.t * State.Block_comment.t
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| E of Epsilon_action.t * State.Block_comment.t
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| Error of Error.t
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| End_comment
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end
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let block_comment_transition
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: State.Block_comment.t * char -> Block_comment_transition.t
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= function
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| Quoted_string state, c -> (
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match quoted_string_transition In_block_comment (state, c) with
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| End_of_quoted_string -> T (Add_token_char, Normal)
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| T (action, state) -> T (action, Quoted_string state)
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| E (action, state) -> E (action, Quoted_string state)
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| Error error -> Error error
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)
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| After_hash, '|' -> T (Start_block_comment, Normal)
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| After_pipe, '#' -> End_comment
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| _, '"' -> T (Add_token_char, Quoted_string Normal)
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| _, '|' -> T (Add_token_char, After_pipe)
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| _, '#' -> T (Add_token_char, After_hash)
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| _, _ -> T (Add_token_char, Normal)
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let transition : State.t * char -> Transition.t = function
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| Whitespace, '(' -> T (Opening, Whitespace)
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| Whitespace, ')' -> T (Closing, Whitespace)
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| Whitespace, '\r' -> T (Nop, After_cr)
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| Whitespace, (' ' | '\t' | '\012' | '\n') -> T (Nop, Whitespace)
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| Whitespace, ';' -> T (Start_line_comment, Line_comment)
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| Whitespace, '"' -> T (Start_quoted_string, Quoted_string (Normal))
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| Whitespace, '#' -> T (Nop, After_hash)
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| Whitespace, '|' -> T (Add_first_char, Unquoted_string After_pipe)
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| Whitespace, _ -> T (Add_first_char, Unquoted_string Normal)
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| After_cr, '\n' -> T (Nop, Whitespace)
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| After_cr, _ -> Error Unexpected_character_after_cr
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| Unquoted_string _, (';'|'('|')'|'"'|' '|'\t'|'\012'|'\r'|'\n') ->
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E (Push_atom, Whitespace)
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| Unquoted_string After_hash, '|'
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| Unquoted_string After_pipe, '#' -> Error Comment_token_in_unquoted_atom
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| Unquoted_string _, '#' -> T (Add_atom_char, Unquoted_string After_hash)
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| Unquoted_string _, '|' -> T (Add_atom_char, Unquoted_string After_pipe)
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| Unquoted_string _, _ -> T (Add_atom_char, Unquoted_string Normal)
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| Line_comment, ('\r' | '\n') -> E (End_line_comment, Whitespace)
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| Line_comment, _ -> T (Add_token_char, Line_comment)
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| After_hash, ';' -> T (Start_sexp_comment, Whitespace)
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| After_hash, '|' -> T (Start_block_comment, Block_comment Normal)
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| After_hash, _ -> E (Add_first_char_hash, Unquoted_string Normal)
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| Quoted_string state, c -> (
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match quoted_string_transition In_atom (state, c) with
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| End_of_quoted_string -> T (Push_quoted_atom, Whitespace)
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| T (action, state) -> T (action, Quoted_string state)
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| E (action, state) -> E (action, Quoted_string state)
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| Error error -> Error error
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)
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| Block_comment state, c -> (
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match block_comment_transition (state, c) with
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| T (action, state) -> T (action, Block_comment state)
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| E (action, state) -> E (action, Block_comment state)
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| End_comment -> End_block_comment
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| Error error -> Error error
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)
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| Error, _ -> Error Automaton_in_error_state
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let transition_eoi : State.t -> Final_transition.t = function
|
||||
| Whitespace -> Eoi_check
|
||||
| After_cr -> Error Unexpected_character_after_cr
|
||||
| Unquoted_string _ -> E (Push_atom, Whitespace)
|
||||
| Line_comment -> E (End_line_comment, Whitespace)
|
||||
| After_hash -> E (Add_first_char_hash, Unquoted_string Normal)
|
||||
| Quoted_string _ -> Error Unterminated_quoted_string
|
||||
| Block_comment _ -> Error Unterminated_block_comment
|
||||
| Error -> Error Automaton_in_error_state
|
||||
end
|
||||
|
||||
module Table = struct
|
||||
type action = Epsilon_action.t list * Action.t [@@deriving compare, sexp_of, hash]
|
||||
type goto_state = State of int | End_block_comment [@@deriving compare, sexp_of, hash]
|
||||
type advance = Advance | Advance_eol [@@deriving compare, sexp_of, hash]
|
||||
type transition = { action : action; goto : goto_state; advance : advance }
|
||||
[@@deriving compare, sexp_of, hash]
|
||||
type 'a or_error =
|
||||
| Ok of 'a
|
||||
| Error of Error.t
|
||||
[@@deriving compare, sexp_of, hash]
|
||||
|
||||
type t =
|
||||
{ transitions : transition or_error array
|
||||
; transitions_eoi : Epsilon_action.t list or_error array
|
||||
}
|
||||
|
||||
let advance = function
|
||||
| '\n' -> Advance_eol
|
||||
| _ -> Advance
|
||||
|
||||
let compile (module A : Automaton) =
|
||||
let rec squash acc state c =
|
||||
match A.transition (state, c) with
|
||||
| T (action, state) -> Ok { action = (List.rev acc, action)
|
||||
; goto = State (State.to_int state)
|
||||
; advance = advance c
|
||||
}
|
||||
| E (action, state) -> squash (action :: acc) state c
|
||||
| Error error -> Error error
|
||||
| End_block_comment -> Ok { action = (List.rev acc, Nop)
|
||||
; goto = End_block_comment
|
||||
; advance = advance c
|
||||
}
|
||||
in
|
||||
let rec squash_eoi acc state =
|
||||
match A.transition_eoi state with
|
||||
| Eoi_check -> Ok (List.rev acc)
|
||||
| E (eps_action, state) -> squash_eoi (eps_action :: acc) state
|
||||
| Error error -> Error error
|
||||
in
|
||||
let transitions =
|
||||
Array.create ~len:(State.count * 256)
|
||||
(Ok { action = ([], Action.Nop)
|
||||
; goto = State 0
|
||||
; advance = Advance
|
||||
})
|
||||
in
|
||||
let transitions_eoi = Array.create (Ok []) ~len:State.count in
|
||||
for s = 0 to State.count - 1 do
|
||||
let state = State.of_int s in
|
||||
for c = 0 to 255 do
|
||||
transitions.(s * 256 + c) <- squash [] state (Char.of_int_exn c);
|
||||
done;
|
||||
transitions_eoi.(s) <- squash_eoi [] state
|
||||
done;
|
||||
{ transitions; transitions_eoi }
|
||||
end
|
||||
|
||||
let table = Table.compile (module Automaton)
|
||||
|
|
@ -0,0 +1,10 @@
|
|||
(library
|
||||
((name gen_parsexp_lib)
|
||||
(libraries (base))
|
||||
(preprocess (pps (ppx_sexp_conv
|
||||
ppx_compare
|
||||
ppx_enumerate
|
||||
ppx_hash
|
||||
ppx_variants_conv)))))
|
||||
|
||||
(jbuild_version 1)
|
||||
|
|
@ -1,3 +1,10 @@
|
|||
(jbuild_version 1)
|
||||
|
||||
(library ((name usexp)))
|
||||
|
||||
(rule
|
||||
(with-stdout-to table.ml.gen (run gen/gen_parser_automaton.exe)))
|
||||
|
||||
(alias
|
||||
((name update-sexp-parser)
|
||||
(action (diff table.ml table.ml.gen))))
|
||||
|
|
|
|||
|
|
@ -1,5 +1,4 @@
|
|||
(* This file was copied and adapted from the src/parser_automaton.ml file of
|
||||
https://github.com/janestreet/parsexp *)
|
||||
(* generated by ./gen/gen_parser_automaton.exe *)
|
||||
|
||||
open Parser_automaton_internal
|
||||
|
||||
|
|
@ -1317,3 +1316,4 @@ let transitions_eoi =
|
|||
; tr_eoi_07
|
||||
; tr_eoi_07
|
||||
|]
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue