577 lines
18 KiB
OCaml
577 lines
18 KiB
OCaml
(* camlp4r *)
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(* $Id$ *)
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#load "q_MLast.cmo";
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open Gramext;
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value strict_parsing = ref False;
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value keywords = ref [];
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value loc = (0, 0);
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(* Watch the segmentation faults here! the compiled file must have been
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loaded in camlp4 with the option pa_extend.cmo -meta_action. *)
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value magic_act (act : Obj.t) : MLast.expr = Obj.magic act;
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(* Names of symbols for error messages; code borrowed to grammar.ml *)
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value rec name_of_symbol entry =
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fun
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[ Snterm e -> "[" ^ e.ename ^ "]"
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| Snterml e l -> "[" ^ e.ename ^ " level " ^ l ^ "]"
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| Sself | Snext -> "[" ^ entry.ename ^ "]"
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| Stoken tok -> entry.egram.glexer.Token.text tok
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| _ -> "???" ]
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;
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value rec name_of_symbol_failed entry =
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fun
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[ Slist0 s -> name_of_symbol_failed entry s
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| Slist0sep s _ -> name_of_symbol_failed entry s
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| Slist1 s -> name_of_symbol_failed entry s
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| Slist1sep s _ -> name_of_symbol_failed entry s
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| Sopt s -> name_of_symbol_failed entry s
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| Stree t -> name_of_tree_failed entry t
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| s -> name_of_symbol entry s ]
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and name_of_tree_failed entry =
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fun
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[ Node {node = s; brother = bro; son = son} ->
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let txt = name_of_symbol_failed entry s in
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let txt =
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match (s, son) with
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[ (Sopt _, Node _) -> txt ^ " or " ^ name_of_tree_failed entry son
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| _ -> txt ]
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in
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let txt =
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match bro with
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[ DeadEnd | LocAct _ _ -> txt
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| _ -> txt ^ " or " ^ name_of_tree_failed entry bro ]
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in
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txt
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| DeadEnd | LocAct _ _ -> "???" ]
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;
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value tree_failed entry prev_symb tree =
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let (s2, s3) =
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let txt = name_of_tree_failed entry tree in
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match prev_symb with
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[ Slist0 s ->
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let txt1 = name_of_symbol_failed entry s in
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("", txt1 ^ " or " ^ txt)
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| Slist1 s ->
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let txt1 = name_of_symbol_failed entry s in
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("", txt1 ^ " or " ^ txt)
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| Slist0sep s sep ->
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let txt1 = name_of_symbol_failed entry s in
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("", txt1 ^ " or " ^ txt)
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| Slist1sep s sep ->
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let txt1 = name_of_symbol_failed entry s in
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("", txt1 ^ " or " ^ txt)
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| Sopt _ | Stree _ -> ("", txt)
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| _ -> (name_of_symbol entry prev_symb, txt) ]
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in
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<:expr<
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P.error $str:entry.ename$ $str:String.escaped s2$ $str:String.escaped s3$
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>>
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;
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(* Compilation *)
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value rec find_act =
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fun
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[ DeadEnd -> failwith "find_act"
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| LocAct act _ -> (magic_act act, 0)
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| Node {son = son; brother = bro} ->
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let (act, n) = try find_act son with [ Failure _ -> find_act bro ] in
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(act, n + 1) ]
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;
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value level_number e l =
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match e.edesc with
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[ Dlevels elevs ->
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loop 0 elevs where rec loop n =
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fun
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[ [lev :: levs] -> if lev.lname = Some l then n else loop (n + 1) levs
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| [] -> failwith ("level " ^ l ^ " not found in entry " ^ e.ename) ]
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| Dparser _ -> 0 ]
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;
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value nth_patt_of_act (e, n) =
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let patt_list =
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loop e where rec loop =
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fun
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[ <:expr< fun (loc : (int * int)) -> $_$ >> -> []
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| <:expr< fun ($p$ : $_$) -> $e$ >> -> [p :: loop e]
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| <:expr< fun $p$ -> $e$ >> -> [p :: loop e]
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| _ -> failwith "nth_patt_of_act" ]
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in
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List.nth patt_list n
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;
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value rec last_patt_of_act =
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fun
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[ <:expr< fun ($p$ : $_$) (loc : (int * int)) -> $_$ >> -> p
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| <:expr< fun $_$ -> $e$ >> -> last_patt_of_act e
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| _ -> failwith "last_patt_of_act" ]
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;
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value rec final_action =
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fun
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[ <:expr< fun (loc : (int * int)) -> ($e$ : $_$) >> -> e
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| <:expr< fun $_$ -> $e$ >> -> final_action e
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| _ -> failwith "final_action" ]
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;
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value parse_standard_symbol e rkont fkont ending_act =
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<:expr<
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match try Some ($e$ strm__) with [ Stream.Failure -> None ] with
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[ Some $nth_patt_of_act ending_act$ -> $rkont$
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| _ -> $fkont$ ]
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>>
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;
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value rec contain_loc =
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fun
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[ <:expr< $lid:s$ >> -> s = "loc"
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| <:expr< $uid:_$ >> -> False
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| <:expr< $str:_$ >> -> False
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| <:expr< ($list:el$) >> -> List.exists contain_loc el
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| <:expr< $e1$ $e2$ >> -> contain_loc e1 || contain_loc e2
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| _ -> True ]
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;
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value gen_let_loc loc e =
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if contain_loc e then <:expr< let loc = P.gloc bp strm__ in $e$ >> else e
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;
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value phony_entry = Grammar.Entry.obj Pcaml.implem;
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value rec parse_tree entry nlevn alevn (tree, fst_symb) act_kont kont =
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match tree with
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[ DeadEnd -> kont
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| LocAct act _ ->
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let act = magic_act act in
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act_kont False act
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| Node {node = Sself; son = LocAct act _; brother = bro} ->
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let act = magic_act act in
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let n = entry.ename ^ "_" ^ string_of_int alevn in
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let e =
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if strict_parsing.val || alevn = 0 || fst_symb then <:expr< $lid:n$ >>
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else <:expr< P.orzero $lid:n$ $lid:entry.ename ^ "_0"$ >>
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in
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let p2 =
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match bro with
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[ DeadEnd -> kont
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| _ -> parse_tree entry nlevn alevn (bro, fst_symb) act_kont kont ]
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in
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let p1 = act_kont True act in
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parse_standard_symbol e p1 p2 (act, 0)
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| Node {node = s; son = LocAct act _; brother = bro} ->
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let act = magic_act act in
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let p2 = parse_tree entry nlevn alevn (bro, fst_symb) act_kont kont in
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let p1 = act_kont False act in
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parse_symbol entry nlevn s p1 p2 (act, 0)
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| Node {node = s; son = son; brother = bro} ->
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let p2 = parse_tree entry nlevn alevn (bro, fst_symb) act_kont kont in
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let p1 =
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let err =
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let txt = tree_failed entry s son in
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<:expr< raise (Stream.Error $txt$) >>
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in
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match son with
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[ Node {brother = DeadEnd} ->
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parse_tree entry nlevn alevn (son, False) act_kont err
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| _ ->
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let p1 =
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parse_tree entry nlevn alevn (son, True) act_kont
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<:expr< raise Stream.Failure >>
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in
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<:expr< try $p1$ with [ Stream.Failure -> $err$ ] >> ]
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in
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parse_symbol entry nlevn s p1 p2 (find_act son) ]
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and parse_symbol entry nlevn s rkont fkont ending_act =
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match s with
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[ Slist0 s ->
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let e = <:expr< P.list0 $symbol_parser entry nlevn s$ >> in
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parse_standard_symbol e rkont fkont ending_act
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| Slist1 s ->
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let e = <:expr< P.list1 $symbol_parser entry nlevn s$ >> in
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parse_standard_symbol e rkont fkont ending_act
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| Slist0sep s sep ->
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let e =
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<:expr<
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P.list0sep $symbol_parser entry nlevn s$
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$symbol_parser entry nlevn sep$ >>
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in
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parse_standard_symbol e rkont fkont ending_act
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| Slist1sep s sep ->
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let e =
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<:expr<
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P.list1sep $symbol_parser entry nlevn s$
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$symbol_parser entry nlevn sep$ >>
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in
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parse_standard_symbol e rkont fkont ending_act
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| Sopt s ->
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let e = <:expr< P.option $symbol_parser entry nlevn s$ >> in
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parse_standard_symbol e rkont fkont ending_act
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| Stree tree ->
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let kont = <:expr< raise Stream.Failure >> in
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let act_kont _ act = gen_let_loc loc (final_action act) in
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let e = parse_tree phony_entry 0 0 (tree, True) act_kont kont in
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parse_standard_symbol <:expr< fun strm__ -> $e$ >> rkont fkont ending_act
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| Snterm e ->
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let n =
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match e.edesc with
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[ Dparser _ -> e.ename
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| Dlevels _ -> e.ename ^ "_0" ]
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in
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parse_standard_symbol <:expr< $lid:n$ >> rkont fkont ending_act
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| Snterml e l ->
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let n = e.ename ^ "_" ^ string_of_int (level_number e l) in
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parse_standard_symbol <:expr< $lid:n$ >> rkont fkont ending_act
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| Sself ->
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let n = entry.ename ^ "_0" in
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parse_standard_symbol <:expr< $lid:n$ >> rkont fkont ending_act
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| Stoken tok ->
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let _ =
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do {
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if fst tok = "" && not (List.mem (snd tok) keywords.val) then
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keywords.val := [snd tok :: keywords.val]
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else ()
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}
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in
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let p =
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let patt = nth_patt_of_act ending_act in
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let p_con = String.escaped (fst tok) in
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let p_prm = String.escaped (snd tok) in
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if snd tok = "" then
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if fst tok = "ANY" then <:patt< (_, $patt$) >>
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else <:patt< ($str:p_con$, $patt$) >>
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else
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let p = <:patt< ($str:p_con$, $str:p_prm$) >> in
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match patt with
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[ <:patt< _ >> -> <:patt< ($str:p_con$, $str:p_prm$) >>
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| _ -> <:patt< ($str:p_con$, ($str:p_prm$ as $patt$)) >> ]
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in
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<:expr<
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match Stream.peek strm__ with
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[ Some $p$ -> do { Stream.junk strm__; $rkont$ }
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| _ -> $fkont$ ]
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>>
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| _ ->
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parse_standard_symbol <:expr< ps >> rkont fkont ending_act ]
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and symbol_parser entry nlevn =
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fun
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[ Snterm e ->
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let n = e.ename ^ "_0" in
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<:expr< $lid:n$ >>
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| Snterml e l ->
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let n = e.ename ^ "_" ^ string_of_int (level_number e l) in
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<:expr< $lid:n$ >>
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| Snext ->
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let n = entry.ename ^ "_" ^ string_of_int nlevn in
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if strict_parsing.val then <:expr< $lid:n$ >>
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else
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let n0 = entry.ename ^ "_0" in
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<:expr< P.orzero $lid:n$ $lid:n0$ >>
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| Stoken tok ->
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let _ =
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do {
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if fst tok = "" && not (List.mem (snd tok) keywords.val) then
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keywords.val := [snd tok :: keywords.val]
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else ()
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}
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in
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let p_con = String.escaped (fst tok) in
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let p_prm = String.escaped (snd tok) in
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<:expr< P.token ($str:p_con$, $str:p_prm$) >>
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| Stree tree ->
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let kont = <:expr< raise Stream.Failure >> in
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let act_kont _ act = final_action act in
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<:expr<
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fun strm__ ->
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$parse_tree phony_entry 0 0 (tree, True) act_kont kont$
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>>
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| _ ->
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<:expr< aaa >> ]
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;
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value rec start_parser_of_levels entry clevn levs =
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let n = entry.ename ^ "_" ^ string_of_int clevn in
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let next = entry.ename ^ "_" ^ string_of_int (clevn + 1) in
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let p = <:patt< $lid:n$ >> in
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match levs with
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[ [] -> [Some (p, <:expr< fun strm__ -> raise Stream.Failure >>)]
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| [lev :: levs] ->
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let pel = start_parser_of_levels entry (succ clevn) levs in
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match lev.lprefix with
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[ DeadEnd ->
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let ncont =
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if not strict_parsing.val && clevn = 0 then
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entry.ename ^ "_gen_cont"
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else entry.ename ^ "_" ^ string_of_int clevn ^ "_cont"
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in
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let curr =
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<:expr< let a = $lid:next$ strm__ in $lid:ncont$ bp a strm__ >>
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in
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let curr = <:expr< let bp = Stream.count strm__ in $curr$ >> in
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let e = <:expr< fun strm__ -> $curr$ >> in
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let pel = if levs = [] then [] else pel in
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[Some (p, e) :: pel]
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| tree ->
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let alevn = clevn in
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let (kont, pel) =
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match levs with
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[ [] -> (<:expr< raise Stream.Failure >>, [])
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| _ ->
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let e =
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match (lev.assoc, lev.lsuffix) with
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[ (NonA, _) | (_, DeadEnd) -> <:expr< $lid:next$ strm__ >>
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| _ ->
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let ncont =
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entry.ename ^ "_" ^ string_of_int clevn ^ "_cont"
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in
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<:expr<
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let a = $lid:next$ strm__ in
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$lid:ncont$ bp a strm__
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>> ]
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in
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(e, pel) ]
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in
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let act_kont end_with_self act =
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if lev.lsuffix = DeadEnd then gen_let_loc loc (final_action act)
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else
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let ncont = entry.ename ^ "_" ^ string_of_int clevn ^ "_cont" in
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gen_let_loc loc
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<:expr< $lid:ncont$ bp $final_action act$ strm__ >>
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in
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let curr =
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parse_tree entry (succ clevn) alevn (tree, True) act_kont kont
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in
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let curr = <:expr< let bp = Stream.count strm__ in $curr$ >> in
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let e = <:expr< fun strm__ -> $curr$ >> in
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[Some (p, e) :: pel] ] ]
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;
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value rec continue_parser_of_levels entry clevn levs =
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let n = entry.ename ^ "_" ^ string_of_int clevn ^ "_cont" in
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let p = <:patt< $lid:n$ >> in
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match levs with
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[ [] -> [None]
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| [lev :: levs] ->
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let pel = continue_parser_of_levels entry (succ clevn) levs in
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match lev.lsuffix with
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[ DeadEnd ->
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(*
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let ncont = entry.ename ^ "_" ^ string_of_int clevn ^ "_cont" in
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let e = <:expr< fun bp a__ strm__ -> a__ >> in
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let pel = if levs = [] then [] else pel in
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*)
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[None :: pel]
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| tree ->
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let alevn =
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match lev.assoc with
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[ LeftA | NonA -> succ clevn
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| RightA -> clevn ]
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in
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let (kont, pel) =
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match levs with
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[ [] -> (<:expr< a__ >>, [])
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| _ -> (<:expr< a__ >>, pel) ]
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in
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let act_kont end_with_self act =
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let p = last_patt_of_act act in
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match lev.assoc with
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[ RightA | NonA ->
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<:expr<
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let $p$ = a__ in
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$gen_let_loc loc (final_action act)$
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>>
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| LeftA ->
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let ncont =
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entry.ename ^ "_" ^ string_of_int clevn ^ "_cont"
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in
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gen_let_loc loc
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<:expr<
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let $p$ = a__ in
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$lid:ncont$ bp $final_action act$ strm__
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>> ]
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in
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let curr =
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parse_tree entry (succ clevn) alevn (tree, True) act_kont kont
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in
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let e = <:expr< fun bp a__ strm__ -> $curr$ >> in
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[Some (p, e) :: pel] ] ]
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;
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value continue_parser_of_levels_again entry levs =
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let n = entry.ename ^ "_gen_cont" in
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let e =
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loop <:expr< a__ >> 0 levs where rec loop var levn =
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fun
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[ [] -> <:expr< if x == a__ then x else $lid:n$ bp x strm__ >>
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| [lev :: levs] ->
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match lev.lsuffix with
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[ DeadEnd -> loop var (levn + 1) levs
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| _ ->
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let n = entry.ename ^ "_" ^ string_of_int levn ^ "_cont" in
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let rest = loop <:expr< x >> (levn + 1) levs in
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<:expr< let x = $lid:n$ bp $var$ strm__ in $rest$ >> ] ]
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in
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(<:patt< $lid:n$ >>, <:expr< fun bp a__ strm__ -> $e$ >>)
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;
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value empty_entry ename =
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let p = <:patt< $lid:ename$ >> in
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let e =
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<:expr<
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fun strm__ ->
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raise (Stream.Error $str:"entry [" ^ ename ^ "] is empty"$) >>
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in
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[Some (p, e)]
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;
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value start_parser_of_entry entry =
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match entry.edesc with
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[ Dlevels [] -> empty_entry entry.ename
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| Dlevels elev -> start_parser_of_levels entry 0 elev
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| Dparser p -> [] ]
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;
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value continue_parser_of_entry entry =
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match entry.edesc with
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[ Dlevels elev -> continue_parser_of_levels entry 0 elev
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| Dparser p -> [] ]
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;
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value continue_parser_of_entry_again entry =
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if strict_parsing.val then []
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else
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match entry.edesc with
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[ Dlevels ([_; _ :: _] as levs) ->
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[continue_parser_of_levels_again entry levs]
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| _ -> [] ]
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;
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value rec list_alternate l1 l2 =
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match (l1, l2) with
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[ ([x1 :: l1], [x2 :: l2]) -> [x1; x2 :: list_alternate l1 l2]
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| ([], l2) -> l2
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| (l1, []) -> l1 ]
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;
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value compile_entry entry =
|
|
let pel1 = start_parser_of_entry entry in
|
|
let pel2 = continue_parser_of_entry entry in
|
|
let pel = list_alternate pel1 pel2 in
|
|
List.fold_right
|
|
(fun pe list ->
|
|
match pe with
|
|
[ Some pe -> [pe :: list]
|
|
| None -> list ])
|
|
pel (continue_parser_of_entry_again entry)
|
|
;
|
|
|
|
(* get all entries connected together *)
|
|
|
|
value rec scan_tree list =
|
|
fun
|
|
[ Node {node = n; son = son; brother = bro} ->
|
|
let list = scan_symbol list n in
|
|
let list = scan_tree list son in
|
|
let list = scan_tree list bro in
|
|
list
|
|
| LocAct _ _ | DeadEnd -> list ]
|
|
and scan_symbol list =
|
|
fun
|
|
[ Snterm e -> scan_entry list e
|
|
| Snterml e l -> scan_entry list e
|
|
| Slist0 s -> scan_symbol list s
|
|
| Slist0sep s sep -> scan_symbol (scan_symbol list s) sep
|
|
| Slist1 s -> scan_symbol list s
|
|
| Slist1sep s sep -> scan_symbol (scan_symbol list s) sep
|
|
| Sopt s -> scan_symbol list s
|
|
| Stree t -> scan_tree list t
|
|
| Sself | Snext | Stoken _ -> list ]
|
|
and scan_level list lev =
|
|
let list = scan_tree list lev.lsuffix in
|
|
let list = scan_tree list lev.lprefix in
|
|
list
|
|
and scan_levels list levs = List.fold_left scan_level list levs
|
|
and scan_entry list entry =
|
|
if List.memq entry list then list
|
|
else
|
|
match entry.edesc with
|
|
[ Dlevels levs -> scan_levels [entry :: list] levs
|
|
| Dparser _ -> list ]
|
|
;
|
|
|
|
value all_entries_in_graph list entry =
|
|
List.rev (scan_entry list entry)
|
|
;
|
|
|
|
(* main *)
|
|
|
|
value entries = ref [];
|
|
|
|
(*
|
|
[Grammar.Entry.obj Pcaml.interf;
|
|
Grammar.Entry.obj Pcaml.implem;
|
|
Grammar.Entry.obj Pcaml.top_phrase;
|
|
Grammar.Entry.obj Pcaml.use_file;
|
|
Grammar.Entry.obj Pcaml.str_item;
|
|
Grammar.Entry.obj Pcaml.sig_item;
|
|
Grammar.Entry.obj Pcaml.ctyp;
|
|
Grammar.Entry.obj Pcaml.expr;
|
|
Grammar.Entry.obj Pcaml.patt]
|
|
*)
|
|
|
|
value rec list_mem_right_assoc x =
|
|
fun
|
|
[ [] -> False
|
|
| [(a, b) :: l] -> x = b || list_mem_right_assoc x l ]
|
|
;
|
|
|
|
value rec expr_list =
|
|
fun
|
|
[ [] -> <:expr< [] >>
|
|
| [x :: l] -> <:expr< [$str:String.escaped x$ :: $expr_list l$] >> ]
|
|
;
|
|
|
|
value compile () =
|
|
let _ = do { keywords.val := []; } in
|
|
let list = List.fold_left all_entries_in_graph [] entries.val in
|
|
let list =
|
|
List.filter (fun e -> List.memq e list) entries.val @
|
|
List.filter (fun e -> not (List.memq e entries.val)) list
|
|
in
|
|
let list =
|
|
let set = ref [] in
|
|
List.fold_right
|
|
(fun entry list ->
|
|
if List.mem entry.ename set.val then
|
|
list
|
|
else do { set.val := [entry.ename :: set.val]; [entry :: list] })
|
|
list []
|
|
in
|
|
let pell = List.map compile_entry list in
|
|
let pel = List.flatten pell in
|
|
let si1 = <:str_item< value rec $list:pel$ >> in
|
|
let si2 =
|
|
let list = List.sort compare keywords.val in
|
|
<:str_item<
|
|
List.iter (fun kw -> P.lexer.Token.using ("", kw))
|
|
$expr_list list$
|
|
>>
|
|
in
|
|
let loc = (1, 1) in
|
|
([(si1, loc); (si2, loc)], False)
|
|
;
|
|
|
|
Pcaml.parse_implem.val := fun _ -> compile ();
|
|
|
|
Pcaml.add_option "-strict_parsing" (Arg.Set strict_parsing)
|
|
" don't generate error recovering by trying continuations or first levels"
|
|
;
|