viewcvs.cgi/parser/parser.ml

open Location
open Ast
open Ident
open Printf

(*
let ()  = Grammar.error_verbose := true
*)

exception Error of string
let error (i,j) s = Location.raise_loc i j (Error s)

let gram    = Grammar.gcreate (Wlexer.lexer Wlexer.token Wlexer.latin1_engine)

let true_atom = Atoms.mk_ascii "true"
let false_atom = Atoms.mk_ascii "false"
let true_type = Types.atom (Atoms.atom true_atom)
let false_type = Types.atom (Atoms.atom false_atom)

let parse_ident = U.mk_latin1

let id_dummy = ident (U.mk "$$$")

let split_qname s =
  try
    let i = String.index s ':' in
    let ns = String.sub s 0 i in
    let s = String.sub s (i + 1) (String.length s - i - 1) in
    (parse_ident ns, parse_ident s)
  with Not_found -> 
    (U.mk "", parse_ident s)

let label s = LabelPool.mk (parse_ident s)
let ident s = ident (parse_ident s)

let prog    = Grammar.Entry.create gram "prog"
let top_phrases   = Grammar.Entry.create gram "toplevel phrases"
let expr    = Grammar.Entry.create gram "expression"
let pat     = Grammar.Entry.create gram "type/pattern expression"
let regexp  = Grammar.Entry.create gram "type/pattern regexp"
let const   = Grammar.Entry.create gram "scalar constant"
                
let exp pos e = LocatedExpr (loc_of_pos pos,e)

let rec multi_prod loc = function
  | [ x ] -> x
  | x :: l -> mk loc (Prod (x, multi_prod loc l))
  | [] -> assert false
      
let rec tuple = function
  | [ x ] -> x
  | x :: l -> Pair (x, tuple l)
  | [] -> assert false

let tuple_queue = 
  List.fold_right (fun x q -> Pair (x, q))


let char = mknoloc (Internal (Types.char Chars.any))
let string_regexp = Star (Elem char)
               
let cst_nil =  Cst (Const_internal (Types.Atom Sequence.nil_atom))
                 
let seq_of_string s =
  let s = Encodings.Utf8.mk s in
  let rec aux i j =
    if Encodings.Utf8.equal_index i j then []
    else let (c,i) = Encodings.Utf8.next s i in c :: (aux i j)
  in
  aux (Encodings.Utf8.start_index s) (Encodings.Utf8.end_index s)

let make_record loc r =
  LabelMap.from_list (fun _ _ -> error loc "Duplicated record field") r

let parse_char loc s =
  match seq_of_string s with
    | [ c ] -> c
    | _ -> error loc "Character litteral must have length 1"

let include_stack = ref []

let protect_exn f g =
  try let x = f () in g (); x
  with e -> g (); raise e

let is_fun_decl =
   Grammar.Entry.of_parser gram "[is_fun_decl]"
     (fun strm ->
       match Stream.npeek 3 strm with
         | [ ("", "fun"); ("LIDENT", _); ("", "(") ]
         | [ ("LIDENT", _) ; ("", "(") ; _ ] -> ()
         | _ -> raise Stream.Failure
     )

let dot_RE = Pcre.regexp "\\."

EXTEND
  GLOBAL: top_phrases prog expr pat regexp const;

  top_phrases: [
    [ l = LIST0 phrase; ";;" -> List.flatten l  ]
  ];

  prog: [
    [ l = LIST0 [ p = phrase ; OPT ";;" -> p ]; EOI -> List.flatten l ]
  ];

  uident: [ [ x = UIDENT -> parse_ident x ] ];

  phrase: [
    [ (f,p,e) = let_binding -> 
        if f then [ mk loc (FunDecl e) ] else
          [ mk loc (LetDecl (p,e)) ]
    | (_,p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
        [ mk loc (EvalStatement (exp loc (Match (e1,[p,e2])))) ]
    | "type"; x = uident; "="; t = pat -> [ mk loc (TypeDecl (x,t)) ]
    | "type"; x = LIDENT -> error loc "Type identifiers must be capitalized"
    | "schema"; name = UIDENT; "="; uri = STRING2 ->
        protect_op "schema";
        let schema_doc = Schema_xml.pxp_tree_of uri in
        let schema = Schema_parser.parse_schema schema_doc in
        [ mk loc (SchemaDecl (name, schema))]
    | "namespace"; 
        name = [ name = [ UIDENT | LIDENT | keyword ]; "=" ->
                   parse_ident name
               | -> U.mk "" ];
        uri = STRING2 ->
          let ns = Atoms.Ns.mk (parse_ident uri) in
          Atoms.Ns.register_prefix name ns;
          [ mk loc (Namespace (name, ns)) ]
    | "debug"; d = debug_directive -> [ mk loc (Debug d) ]
    | DIRECTIVE "#quit" -> [ mk loc (Directive `Quit) ]
    | DIRECTIVE "#env" -> [ mk loc (Directive `Env) ]
    | "include"; s = STRING2 ->
        let s = 
          if Filename.is_relative s 
          then Filename.concat (Location.current_dir ()) s
          else s in
        protect_op "File inclusion";
        (* avoid looping; should issue an error ? *)
        (* it is possible to have looping with x/../x/../x/.. ....
           Need to canonicalize filename *)
        if List.mem s !include_stack then [] 
        else (
          include_stack := s :: !include_stack;
          Location.push_source (`File s);
          protect_exn
            (fun () ->
               let chan = open_in s in
               protect_exn
                 (fun () ->
                    let input = Stream.of_channel chan in
                    Grammar.Entry.parse prog input)
                 (fun () -> close_in chan))
            (fun () ->
               Location.pop_source ();
               include_stack := List.tl !include_stack)
        )
    ] | 
    [ e = expr -> [ mk loc (EvalStatement e) ]
    ]
  ];

  debug_directive: [
    [ LIDENT "filter"; t = pat; p = pat -> `Filter(t,p)
    | LIDENT "accept"; p = pat -> `Accept p
    | LIDENT "compile"; t = pat; p = LIST1 pat -> `Compile (t,p)
    | LIDENT "sample"; t = pat -> `Sample t
    | LIDENT "subtype"; t1 = pat; t2 = pat -> `Subtype (t1,t2)
    ]
  ];

  keyword: [
    [ a = 
        [ "map" | "match" | "with" | "try" | "xtransform"
        | "if" | "then" | "else"
        | "transform" | "fun" | "in"
        | "let" | "type" | "debug" | "include"
        | "and" | "validate" | "schema" | "namespace"
        ]
        -> a
    ]
  ];

  expr: [
    "top" RIGHTA
    [ "match"; e = SELF; "with"; b = branches -> 
        exp loc (Match (e,b))
    | "try"; e = SELF; "with"; b = branches -> 
        exp loc (Try (e,b))
    | "map"; e = SELF; "with"; b = branches -> 
        exp loc (Map (e,b))
    | "xtransform"; e = SELF; "with"; b = branches -> 
        exp loc (Xtrans (e,b))
    | "if"; e = SELF; "then"; e1 = SELF; "else"; e2 = SELF ->
        let p1 = mk loc (Internal true_type)
        and p2 = mk loc (Internal false_type) in
        exp loc (Match (e, [p1,e1; p2,e2]))
    | "transform"; e = SELF; "with"; b = branches -> 
        exp loc (Transform (e,b))
    | "validate"; e = SELF; "with"; schema = UIDENT; "#";
      typ = [ UIDENT | LIDENT | keyword ] ->
        exp loc (Validate (e, schema, typ))
    | "fun"; (f,a,b) = fun_decl ->
        exp loc (Abstraction { fun_name = f; fun_iface = a; fun_body = b })
    | (_,p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
        exp loc (Match (e1,[p,e2]))
    | e = expr; ":"; p = pat ->
        exp loc (Forget (e,p))
    ]

    
    | 
    [ e1 = expr; op = ["=" | "<=" | "<<" | ">>" | ">=" ]; e2 = expr -> 
        let op = match op with
          | "<<" -> "<"
          | ">>" -> ">"
          | s -> s in
        exp loc (Op (op,[e1;e2]))
    ]

    | 
    [ e1 = expr; op = ["+" | "-" | "@" ]; e2 = expr -> 
        exp loc (Op (op,[e1;e2]))
    | e = expr; "\\"; l = [LIDENT | UIDENT | keyword ] -> 
        exp loc (RemoveField (e, label l)) 
    ]
    |
    [ e1 = expr; op = ["*"]; e2 = expr -> exp loc (Op (op,[e1;e2]))  
    | e = expr; op = "/"; p = pat ->

        let tag = mk loc (Internal (Types.atom (Atoms.any))) in
        let att = mk loc (Internal Types.Record.any) in
        let any = mk loc (Internal (Types.any)) in
        let re = Star(Alt(SeqCapture(id_dummy,Elem p), Elem any)) in
        let ct = mk loc (Regexp (re,any)) in
        let p = mk loc (XmlT (tag, multi_prod loc [att;ct])) in
        let b = (p,  Var id_dummy) in
        exp loc (Transform (e,[b]))
    ]
    |
    [ e = expr;  "."; l = [LIDENT | UIDENT | keyword ] -> 
        exp loc (Dot (e, label l)) 
    ]  
 
    |
    [ op = [ LIDENT "flatten"
           | LIDENT "load_xml"
           | LIDENT "load_file" | LIDENT "load_file_utf8"
           | LIDENT "load_html"
           | LIDENT "print_xml" | LIDENT "print_xml_utf8"
           | LIDENT "print"
           | LIDENT "int_of"
           | LIDENT "string_of"
           | LIDENT "atom_of"
           | LIDENT "raise"
           ]; 
      e = expr -> exp loc (Op (op,[e]))
    | op = [ LIDENT "dump_to_file" | LIDENT "dump_to_file_utf8" ];
      e1 = expr LEVEL "no_appl"; e2 = expr -> exp loc (Op (op, [e1;e2])) 
    | e1 = SELF; LIDENT "div"; e2 = expr -> exp loc (Op ("/", [e1;e2]))
    | e1 = SELF; LIDENT "mod"; e2 = expr -> exp loc (Op ("mod", [e1;e2]))
    | e1 = SELF; e2 = expr -> exp loc (Apply (e1,e2))
    ]

    | "no_appl" 
    [ c = const -> exp loc (Cst c)
    | "("; l = LIST1 expr SEP ","; ")" -> exp loc (tuple l)
    | "[";  l = LIST0 seq_elem; e = OPT [ ";"; e = expr -> e ]; "]" ->
        let e = match e with Some e -> e | None -> cst_nil in
        let l = List.fold_right 
                  (fun x q ->
                     match x with
                       | `String (loc,i,j,s) -> exp loc (String (i,j,s,q))
                       | `Elems l -> tuple_queue l q
                       | `Explode x -> Op ("@",[x;q])
                  ) l e
        in
        exp loc l
    | "<"; t = [ "("; e = expr; ")" -> e
               | a = tag -> exp loc (Cst a)
               ];
        a = expr_attrib_spec; ">"; c = expr ->
(*        let t = Pair (cst_nil, t) in *)
          exp loc (Xml (t, Pair (a,c)))
    | "{"; r = [ expr_record_spec | -> exp loc (RecordLitt LabelMap.empty) ]; "}" -> r
    | s = STRING2 ->
        let s = U.mk s in
        exp loc (String (U.start_index s, U.end_index s, s, cst_nil))
    | a = LIDENT -> exp loc (Var (ident a))
    ]

  ];

  tag: [ [ a = [ LIDENT | UIDENT | keyword ] -> 
             let (ns,l) = split_qname a in Const_atom (ns,l) ] ];

  tag_type: [
    [ LIDENT "_" ->  mk loc (Internal (Types.atom Atoms.any))
    | a = [ LIDENT | UIDENT | keyword ] -> 
        let (ns,l) = split_qname a in
        mk loc (AtomT (ns, Some l))
    | t = ANY_IN_NS -> 
        mk loc (AtomT (parse_ident t, None)) 
    ]
  ];

  seq_elem: [
    [ x = STRING1 -> 
        let s = U.mk x in
        `String (loc, U.start_index s, U.end_index s, s)
    | e = expr LEVEL "no_appl" -> `Elems [e]
    | "!"; e = expr LEVEL "no_appl" -> `Explode e
    ]
  ];
          
  let_binding: [
    [ "let"; is_fun_decl; OPT "fun"; (f,a,b) = fun_decl ->
        let f = match f with Some x -> x | None -> assert false in
        let p = mk loc (Capture f) in
        let abst = { fun_name = Some f; fun_iface = a; fun_body = b } in
        let e = exp loc (Abstraction abst) in
        (true,p,e)
    | "let"; p = pat; "="; e = expr -> (false,p,e)
    | "let"; p = pat; ":"; t = pat; "="; e = expr -> (false,p, Forget (e,t))
    ] 
  ];

 fun_decl_after_lparen: [
(* need an hack to do this, because both productions would
   match   [ OPT LIDENT; "("; pat ] .... *)
   [ p1 = pat LEVEL "no_arrow";
     res = [ "->"; p2 = pat;
             a = [ ";"; a = LIST0 arrow SEP ";" -> a | -> [] ];
             ")"; b = branches -> `Classic (p2,a,b)
           | ":"; targ1 = pat;
             args = LIST0 [ ","; arg = pat; ":"; targ = pat -> (arg,targ) ]; 
             ")"; ":"; tres = pat ; 
             "="; body = expr ->
               `Compact (targ1,args,tres,body)
           ] ->
       match res with
         | `Classic (p2,a,b) -> (p1,p2)::a,b
         | `Compact (targ1,args,tres,body) ->
             let args = (p1,targ1) :: args in
             let targ = multi_prod nopos (List.map snd args) in
             let arg = multi_prod nopos (List.map fst args) in
             let b = [arg, body] in
             let a = [targ,tres] in
             (a,b) ] ];


 fun_decl: [
   [ f = OPT [ x = LIDENT -> ident x]; "("; (a,b) = fun_decl_after_lparen ->
            (f,a,b)
   ]
 ];

 arrow: [
    [ t1 = pat LEVEL "no_arrow"; "->"; t2 = pat -> (t1,t2)]
  ];

  branches: [
    [ OPT "|"; l = LIST1 branch SEP "|" -> l ]
  ];

  branch: [
    [ p = pat LEVEL "no_arrow"; "->"; e = expr -> (p,e) ]
  ];

          
  regexp: [ 
    [ x = regexp; "|"; y = regexp -> 
        match (x,y) with
          | Elem x, Elem y -> Elem (mk loc (Or (x,y)))
          | _ -> Alt (x,y) 
    ]
  | [ x = regexp; y = regexp -> Seq (x,y) ]
  | [ a = LIDENT; "::"; x = regexp -> SeqCapture (ident a,x) ]
  | [ x = regexp; "*" -> Star x
    | x = regexp; "*?" -> WeakStar x
    | x = regexp; "+" -> Seq (x, Star x)
    | x = regexp; "+?" -> Seq (x, WeakStar x)
    | x = regexp; "?" ->  Alt (x, Epsilon)
    | x = regexp; "??" -> Alt (Epsilon, x) ]
  | [ "("; x = regexp; ")" -> x
    | "("; a = LIDENT; ":="; c = const; ")" -> 
        Elem (mk loc (Constant ((ident a,c))))
    | UIDENT "PCDATA" -> string_regexp
    | i = STRING1; "--"; j = STRING1 ->
        let i = Chars.mk_int (parse_char loc i)
        and j = Chars.mk_int (parse_char loc j) in
        Elem (mk loc (Internal (Types.char (Chars.char_class i j))))
    |  s = STRING1 ->
        List.fold_right
          (fun c accu -> 
             let c = Chars.mk_int c in
             let c = Chars.atom c in
             Seq (Elem (mknoloc (Internal (Types.char c))), accu))
          (seq_of_string s)
          Epsilon 
    | e = pat LEVEL "simple" -> Elem e
    ]
  ];

  pat: [ 
      [ x = pat; LIDENT "where"; 
        b = LIST1 [ a = uident; "="; y = pat -> (a,y)
                  | LIDENT -> error loc "Type/pattern identifiers must be capitalized"
                  ] SEP "and"
            -> mk loc (Recurs (x,b)) ]
    | RIGHTA [ x = pat; "->"; y = pat -> mk loc (Arrow (x,y)) ]
    | "no_arrow" [ x = pat; "|"; y = pat -> mk loc (Or (x,y)) ] 
    | "simple" [ x = pat; "&"; y = pat -> mk loc (And (x,y)) 
               | x = pat; "\\"; y = pat -> mk loc (Diff (x,y)) ]
    | 
      [ "{"; r = record_spec; "}" -> mk loc (Record (true,r))
      | "{|"; r = record_spec; "|}" -> mk loc (Record (false,r))
      | LIDENT "_" -> mk loc (Internal Types.any)
      | a = LIDENT -> mk loc (Capture (ident a))
      | "("; a = LIDENT; ":="; c = const; ")" -> 
          mk loc (Constant (ident a,c))
      | schema = UIDENT; "#"; typ = [ UIDENT | LIDENT | keyword ];
        k = OPT [ "as"; k = [ "element" | "type" | "attribute" ] -> k ] ->
          let kind =
            match k with
            | None -> `Any
            | Some "element" -> `Element
            | Some "type" -> `Type
            | Some "attribute" -> `Attribute
            | _ -> assert false
          in
          mk loc (SchemaVar (kind, schema, typ))
      | a = uident -> mk loc (PatVar a)
      | i = INT ; "--"; j = INT -> 
          let i =  Intervals.mk i 
          and j =  Intervals.mk j in
          mk loc (Internal (Types.interval (Intervals.bounded i j)))
      | i = INT -> 
          let i =  Intervals.mk i  in
          mk loc (Internal (Types.interval (Intervals.atom i)))
      | "*"; "--"; j = INT ->
          let j =  Intervals.mk j in
          mk loc (Internal (Types.interval (Intervals.left j)))
      | i = INT; "--"; "*" ->
          let i = Intervals.mk i in
          mk loc (Internal (Types.interval (Intervals.right i)))
      | i = char ->
          mk loc (Internal (Types.char (Chars.char_class i i)))
      | i = char ; "--"; j = char ->
          mk loc (Internal (Types.char (Chars.char_class i j)))
      | "`"; c = tag_type -> c
      | c = const -> 
          (match c with
             | Const_atom (ns,l) -> mk loc (AtomT (ns,Some l))
             | Const_internal c ->
                 mk loc (Internal (Types.constant c))
          )
      | "("; l = LIST1 pat SEP ","; ")" -> multi_prod loc l
      | "["; r = [ r = regexp -> r | -> Epsilon ];
             q = [ ";"; q = pat -> q 
                 | -> mknoloc (Internal (Sequence.nil_type)) ]; 
             "]" -> mk loc (Regexp (r,q))
      | "<"; t =
            [ x = tag_type -> x
            | "("; t = pat; ")" -> t ];
        a = attrib_spec; ">"; c = pat ->
(*        let t = mk loc (Prod (mk loc (Internal Sequence.nil_type), t)) in *)
          mk loc (XmlT (t, multi_prod loc [a;c]))
      | s = STRING2 ->
          let s = 
            List.map 
              (fun c -> 
                 mknoloc (Internal
                             (Types.char
                                (Chars.atom
                                   (Chars.mk_int c))))) 
              (seq_of_string s) in
          let s = s @ [mknoloc (Internal (Sequence.nil_type))] in
          multi_prod loc s
      ]
    
  ];

  record_spec:
    [ [ r = LIST0 [ l = [LIDENT | UIDENT | keyword ]; "=";
                  o = [ "?" -> true | -> false]; 
                  x = pat -> 
                    let x = if o then mk loc (Optional x) else x in
                    (label l, x)
                ] SEP ";" ->
          make_record loc r
      ] ];
  
  char:
    [ 
      [ c = STRING1 -> Chars.mk_int (parse_char loc c) ]
    ];
     

  const:
    [ 
      [ i = INT -> Const_internal (Types.Integer (Intervals.mk i))
      | "`"; a = tag -> a
      | c = char -> Const_internal (Types.Char c) ]
    ];


  attrib_spec:
    [ [ r = record_spec -> mk loc (Record (true,r)) 
      | "("; t = pat; ")" -> t 
      | "{"; r = record_spec; "}" -> mk loc (Record (true,r))
      | "{|"; r = record_spec; "|}" -> mk loc (Record (false,r))
      ] ];

  expr_record_spec:
    [ [ r = LIST1
              [ l = [LIDENT | UIDENT | keyword ]; "="; x = expr -> 
                  (label l,x) ] 
              SEP ";" ->
          exp loc (RecordLitt (make_record loc r))
      ] ];
  
  expr_attrib_spec:
    [ [ r = expr_record_spec -> r ]
    | [ e = expr LEVEL "no_appl" -> e 
      | -> exp loc (RecordLitt (LabelMap.empty)) 
      ] 
    ];
END

let pat = Grammar.Entry.parse pat
and expr = Grammar.Entry.parse expr
and prog = Grammar.Entry.parse prog
and top_phrases = Grammar.Entry.parse top_phrases

let sync () = 
  match !Wlexer.lexbuf with
    | None -> ()
    | Some lb ->
        let rec aux () =
          match !Wlexer.last_tok with
            | ("",";;") | ("EOI","") -> ()
            | _ -> 
                Wlexer.last_tok := Wlexer.token Wlexer.latin1_engine lb; 
                aux ()
        in
        aux ()
1	abate	4	open Location
2			open Ast
3	abate	225	open Ident
4	abate	501	open Printf
5	abate	4
6	abate	161	(*
7	abate	151	let () = Grammar.error_verbose := true
8	abate	161	*)
9	abate	81
10	abate	529	exception Error of string
11			let error (i,j) s = Location.raise_loc i j (Error s)
12	abate	469
13	abate	81	let gram = Grammar.gcreate (Wlexer.lexer Wlexer.token Wlexer.latin1_engine)
14
15	abate	421	let true_atom = Atoms.mk_ascii "true"
16			let false_atom = Atoms.mk_ascii "false"
17			let true_type = Types.atom (Atoms.atom true_atom)
18			let false_type = Types.atom (Atoms.atom false_atom)
19	abate	81
20	abate	529	let parse_ident = U.mk_latin1
21	abate	374
22	abate	375	let id_dummy = ident (U.mk "$$$")
23	abate	529
24			let split_qname s =
25			try
26			let i = String.index s ':' in
27			let ns = String.sub s 0 i in
28			let s = String.sub s (i + 1) (String.length s - i - 1) in
29			(parse_ident ns, parse_ident s)
30			with Not_found ->
31			(U.mk "", parse_ident s)
32
33	abate	374	let label s = LabelPool.mk (parse_ident s)
34	abate	375	let ident s = ident (parse_ident s)
35	abate	374
36	abate	38	let prog = Grammar.Entry.create gram "prog"
37	abate	431	let top_phrases = Grammar.Entry.create gram "toplevel phrases"
38	abate	38	let expr = Grammar.Entry.create gram "expression"
39			let pat = Grammar.Entry.create gram "type/pattern expression"
40			let regexp = Grammar.Entry.create gram "type/pattern regexp"
41			let const = Grammar.Entry.create gram "scalar constant"
42
43	abate	316	let exp pos e = LocatedExpr (loc_of_pos pos,e)
44
45	abate	38	let rec multi_prod loc = function
46			\| [ x ] -> x
47			\| x :: l -> mk loc (Prod (x, multi_prod loc l))
48			\| [] -> assert false
49
50	abate	316	let rec tuple = function
51	abate	38	\| [ x ] -> x
52	abate	316	\| x :: l -> Pair (x, tuple l)
53	abate	38	\| [] -> assert false
54	abate	89
55			let tuple_queue =
56	abate	316	List.fold_right (fun x q -> Pair (x, q))
57	abate	89
58	abate	233
59	abate	249	let char = mknoloc (Internal (Types.char Chars.any))
60	abate	66	let string_regexp = Star (Elem char)
61	abate	38
62	abate	529	let cst_nil = Cst (Const_internal (Types.Atom Sequence.nil_atom))
63	abate	38
64	abate	525	let seq_of_string s =
65	abate	326	let s = Encodings.Utf8.mk s in
66			let rec aux i j =
67	abate	525	if Encodings.Utf8.equal_index i j then []
68			else let (c,i) = Encodings.Utf8.next s i in c :: (aux i j)
69	abate	326	in
70	abate	525	aux (Encodings.Utf8.start_index s) (Encodings.Utf8.end_index s)
71	abate	326
72	abate	233	let make_record loc r =
73			LabelMap.from_list (fun _ _ -> error loc "Duplicated record field") r
74
75	abate	81	let parse_char loc s =
76	abate	525	match seq_of_string s with
77			\| [ c ] -> c
78	abate	310	\| _ -> error loc "Character litteral must have length 1"
79	abate	81
80	abate	249	let include_stack = ref []
81
82	abate	448	let protect_exn f g =
83			try let x = f () in g (); x
84			with e -> g (); raise e
85
86	abate	470	let is_fun_decl =
87			Grammar.Entry.of_parser gram "[is_fun_decl]"
88			(fun strm ->
89			match Stream.npeek 3 strm with
90			\| [ ("", "fun"); ("LIDENT", _); ("", "(") ]
91			\| [ ("LIDENT", _) ; ("", "(") ; _ ] -> ()
92			\| _ -> raise Stream.Failure
93			)
94
95	abate	501	let dot_RE = Pcre.regexp "\\."
96	abate	470
97	abate	38	EXTEND
98	abate	431	GLOBAL: top_phrases prog expr pat regexp const;
99	abate	4
100	abate	431	top_phrases: [
101	abate	446	[ l = LIST0 phrase; ";;" -> List.flatten l ]
102	abate	431	];
103
104	abate	10	prog: [
105	abate	431	[ l = LIST0 [ p = phrase ; OPT ";;" -> p ]; EOI -> List.flatten l ]
106	abate	10	];
107
108	abate	529	uident: [ [ x = UIDENT -> parse_ident x ] ];
109
110	abate	13	phrase: [
111	abate	431	[ (f,p,e) = let_binding ->
112			if f then [ mk loc (FunDecl e) ] else
113			[ mk loc (LetDecl (p,e)) ]
114			\| (_,p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
115	abate	316	[ mk loc (EvalStatement (exp loc (Match (e1,[p,e2])))) ]
116	abate	529	\| "type"; x = uident; "="; t = pat -> [ mk loc (TypeDecl (x,t)) ]
117	abate	431	\| "type"; x = LIDENT -> error loc "Type identifiers must be capitalized"
118	abate	501	\| "schema"; name = UIDENT; "="; uri = STRING2 ->
119	abate	522	protect_op "schema";
120	abate	525	let schema_doc = Schema_xml.pxp_tree_of uri in
121	abate	501	let schema = Schema_parser.parse_schema schema_doc in
122			[ mk loc (SchemaDecl (name, schema))]
123	abate	529	\| "namespace";
124			name = [ name = [ UIDENT \| LIDENT \| keyword ]; "=" ->
125			parse_ident name
126			\| -> U.mk "" ];
127			uri = STRING2 ->
128			let ns = Atoms.Ns.mk (parse_ident uri) in
129			Atoms.Ns.register_prefix name ns;
130			[ mk loc (Namespace (name, ns)) ]
131	abate	431	\| "debug"; d = debug_directive -> [ mk loc (Debug d) ]
132	abate	446	\| DIRECTIVE "#quit" -> [ mk loc (Directive `Quit) ]
133			\| DIRECTIVE "#env" -> [ mk loc (Directive `Env) ]
134	abate	431	\| "include"; s = STRING2 ->
135	abate	471	let s =
136			if Filename.is_relative s
137			then Filename.concat (Location.current_dir ()) s
138			else s in
139	abate	249	protect_op "File inclusion";
140			(* avoid looping; should issue an error ? *)
141	abate	471	(* it is possible to have looping with x/../x/../x/.. ....
142			Need to canonicalize filename *)
143	abate	249	if List.mem s !include_stack then []
144			else (
145			include_stack := s :: !include_stack;
146			Location.push_source (`File s);
147	abate	448	protect_exn
148			(fun () ->
149			let chan = open_in s in
150	abate	471	protect_exn
151			(fun () ->
152			let input = Stream.of_channel chan in
153			Grammar.Entry.parse prog input)
154			(fun () -> close_in chan))
155	abate	448	(fun () ->
156			Location.pop_source ();
157			include_stack := List.tl !include_stack)
158	abate	249	)
159	abate	66	] \|
160	abate	249	[ e = expr -> [ mk loc (EvalStatement e) ]
161	abate	43	]
162	abate	13	];
163
164	abate	43	debug_directive: [
165			[ LIDENT "filter"; t = pat; p = pat -> `Filter(t,p)
166	abate	75	\| LIDENT "accept"; p = pat -> `Accept p
167	abate	43	\| LIDENT "compile"; t = pat; p = LIST1 pat -> `Compile (t,p)
168	abate	407	\| LIDENT "sample"; t = pat -> `Sample t
169	abate	224	\| LIDENT "subtype"; t1 = pat; t2 = pat -> `Subtype (t1,t2)
170	abate	43	]
171			];
172
173	abate	332	keyword: [
174			[ a =
175			[ "map" \| "match" \| "with" \| "try" \| "xtransform"
176			\| "if" \| "then" \| "else"
177			\| "transform" \| "fun" \| "in"
178	abate	431	\| "let" \| "type" \| "debug" \| "include"
179	abate	529	\| "and" \| "validate" \| "schema" \| "namespace"
180	abate	332	]
181			-> a
182			]
183			];
184
185	abate	4	expr: [
186			"top" RIGHTA
187	abate	421	[ "match"; e = SELF; "with"; b = branches ->
188			exp loc (Match (e,b))
189	abate	64	\| "try"; e = SELF; "with"; b = branches ->
190	abate	425	exp loc (Try (e,b))
191	abate	421	\| "map"; e = SELF; "with"; b = branches ->
192			exp loc (Map (e,b))
193			\| "xtransform"; e = SELF; "with"; b = branches ->
194			exp loc (Xtrans (e,b))
195	abate	237	\| "if"; e = SELF; "then"; e1 = SELF; "else"; e2 = SELF ->
196	abate	421	let p1 = mk loc (Internal true_type)
197			and p2 = mk loc (Internal false_type) in
198	abate	316	exp loc (Match (e, [p1,e1; p2,e2]))
199	abate	17	\| "transform"; e = SELF; "with"; b = branches ->
200	abate	421	exp loc (Transform (e,b))
201	abate	501	\| "validate"; e = SELF; "with"; schema = UIDENT; "#";
202			typ = [ UIDENT \| LIDENT \| keyword ] ->
203			exp loc (Validate (e, schema, typ))
204	abate	48	\| "fun"; (f,a,b) = fun_decl ->
205	abate	316	exp loc (Abstraction { fun_name = f; fun_iface = a; fun_body = b })
206	abate	431	\| (_,p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
207	abate	316	exp loc (Match (e1,[p,e2]))
208	abate	54	\| e = expr; ":"; p = pat ->
209	abate	316	exp loc (Forget (e,p))
210	abate	4	]
211
212
213	abate	15	\|
214	abate	237	[ e1 = expr; op = ["=" \| "<=" \| "<<" \| ">>" \| ">=" ]; e2 = expr ->
215			let op = match op with
216			\| "<<" -> "<"
217			\| ">>" -> ">"
218			\| s -> s in
219	abate	316	exp loc (Op (op,[e1;e2]))
220	abate	237	]
221
222			\|
223	abate	242	[ e1 = expr; op = ["+" \| "-" \| "@" ]; e2 = expr ->
224	abate	316	exp loc (Op (op,[e1;e2]))
225	abate	339	\| e = expr; "\\"; l = [LIDENT \| UIDENT \| keyword ] ->
226	abate	374	exp loc (RemoveField (e, label l))
227	abate	51	]
228	abate	16	\|
229	abate	316	[ e1 = expr; op = ["*"]; e2 = expr -> exp loc (Op (op,[e1;e2]))
230	abate	151	\| e = expr; op = "/"; p = pat ->
231
232			let tag = mk loc (Internal (Types.atom (Atoms.any))) in
233			let att = mk loc (Internal Types.Record.any) in
234			let any = mk loc (Internal (Types.any)) in
235	abate	375	let re = Star(Alt(SeqCapture(id_dummy,Elem p), Elem any)) in
236	abate	151	let ct = mk loc (Regexp (re,any)) in
237			let p = mk loc (XmlT (tag, multi_prod loc [att;ct])) in
238	abate	375	let b = (p, Var id_dummy) in
239	abate	421	exp loc (Transform (e,[b]))
240	abate	51	]
241	abate	26	\|
242	abate	339	[ e = expr; "."; l = [LIDENT \| UIDENT \| keyword ] ->
243	abate	374	exp loc (Dot (e, label l))
244	abate	51	]
245	abate	26
246	abate	52	\|
247	abate	66	[ op = [ LIDENT "flatten"
248			\| LIDENT "load_xml"
249	abate	374	\| LIDENT "load_file" \| LIDENT "load_file_utf8"
250	abate	188	\| LIDENT "load_html"
251	abate	374	\| LIDENT "print_xml" \| LIDENT "print_xml_utf8"
252	abate	124	\| LIDENT "print"
253	abate	66	\| LIDENT "int_of"
254	abate	133	\| LIDENT "string_of"
255	abate	329	\| LIDENT "atom_of"
256	abate	421	\| LIDENT "raise"
257	abate	66	];
258	abate	316	e = expr -> exp loc (Op (op,[e]))
259	abate	374	\| op = [ LIDENT "dump_to_file" \| LIDENT "dump_to_file_utf8" ];
260	abate	316	e1 = expr LEVEL "no_appl"; e2 = expr -> exp loc (Op (op, [e1;e2]))
261			\| e1 = SELF; LIDENT "div"; e2 = expr -> exp loc (Op ("/", [e1;e2]))
262			\| e1 = SELF; LIDENT "mod"; e2 = expr -> exp loc (Op ("mod", [e1;e2]))
263			\| e1 = SELF; e2 = expr -> exp loc (Apply (e1,e2))
264	abate	52	]
265
266	abate	4	\| "no_appl"
267	abate	316	[ c = const -> exp loc (Cst c)
268			\| "("; l = LIST1 expr SEP ","; ")" -> exp loc (tuple l)
269	abate	18	\| "["; l = LIST0 seq_elem; e = OPT [ ";"; e = expr -> e ]; "]" ->
270			let e = match e with Some e -> e \| None -> cst_nil in
271	abate	321	let l = List.fold_right
272			(fun x q ->
273			match x with
274	abate	522	\| `String (loc,i,j,s) -> exp loc (String (i,j,s,q))
275	abate	321	\| `Elems l -> tuple_queue l q
276			\| `Explode x -> Op ("@",[x;q])
277			) l e
278			in
279			exp loc l
280	abate	332	\| "<"; t = [ "("; e = expr; ")" -> e
281	abate	529	\| a = tag -> exp loc (Cst a)
282			];
283	abate	81	a = expr_attrib_spec; ">"; c = expr ->
284	abate	529	(* let t = Pair (cst_nil, t) in *)
285			exp loc (Xml (t, Pair (a,c)))
286	abate	316	\| "{"; r = [ expr_record_spec \| -> exp loc (RecordLitt LabelMap.empty) ]; "}" -> r
287	abate	81	\| s = STRING2 ->
288	abate	525	let s = U.mk s in
289	abate	522	exp loc (String (U.start_index s, U.end_index s, s, cst_nil))
290	abate	375	\| a = LIDENT -> exp loc (Var (ident a))
291	abate	4	]
292
293			];
294	abate	18
295	abate	529	tag: [ [ a = [ LIDENT \| UIDENT \| keyword ] ->
296			let (ns,l) = split_qname a in Const_atom (ns,l) ] ];
297
298			tag_type: [
299			[ LIDENT "_" -> mk loc (Internal (Types.atom Atoms.any))
300			\| a = [ LIDENT \| UIDENT \| keyword ] ->
301			let (ns,l) = split_qname a in
302			mk loc (AtomT (ns, Some l))
303			\| t = ANY_IN_NS ->
304			mk loc (AtomT (parse_ident t, None))
305			]
306			];
307
308	abate	18	seq_elem: [
309	abate	522	[ x = STRING1 ->
310	abate	525	let s = U.mk x in
311	abate	522	`String (loc, U.start_index s, U.end_index s, s)
312	abate	89	\| e = expr LEVEL "no_appl" -> `Elems [e]
313			\| "!"; e = expr LEVEL "no_appl" -> `Explode e
314	abate	18	]
315			];
316	abate	4
317			let_binding: [
318	abate	470	[ "let"; is_fun_decl; OPT "fun"; (f,a,b) = fun_decl ->
319			let f = match f with Some x -> x \| None -> assert false in
320			let p = mk loc (Capture f) in
321			let abst = { fun_name = Some f; fun_iface = a; fun_body = b } in
322	abate	316	let e = exp loc (Abstraction abst) in
323	abate	431	(true,p,e)
324	abate	470	\| "let"; p = pat; "="; e = expr -> (false,p,e)
325			\| "let"; p = pat; ":"; t = pat; "="; e = expr -> (false,p, Forget (e,t))
326	abate	4	]
327			];
328
329	abate	470	fun_decl_after_lparen: [
330	abate	85	(* need an hack to do this, because both productions would
331			match [ OPT LIDENT; "("; pat ] .... *)
332	abate	470	[ p1 = pat LEVEL "no_arrow";
333			res = [ "->"; p2 = pat;
334			a = [ ";"; a = LIST0 arrow SEP ";" -> a \| -> [] ];
335			")"; b = branches -> `Classic (p2,a,b)
336			\| ":"; targ1 = pat;
337			args = LIST0 [ ","; arg = pat; ":"; targ = pat -> (arg,targ) ];
338			")"; ":"; tres = pat ;
339			"="; body = expr ->
340			`Compact (targ1,args,tres,body)
341			] ->
342			match res with
343			\| `Classic (p2,a,b) -> (p1,p2)::a,b
344			\| `Compact (targ1,args,tres,body) ->
345			let args = (p1,targ1) :: args in
346			let targ = multi_prod nopos (List.map snd args) in
347			let arg = multi_prod nopos (List.map fst args) in
348			let b = [arg, body] in
349			let a = [targ,tres] in
350			(a,b) ] ];
351
352
353			fun_decl: [
354			[ f = OPT [ x = LIDENT -> ident x]; "("; (a,b) = fun_decl_after_lparen ->
355	abate	85	(f,a,b)
356	abate	470	]
357	abate	48	];
358
359	abate	85	arrow: [
360	abate	9	[ t1 = pat LEVEL "no_arrow"; "->"; t2 = pat -> (t1,t2)]
361	abate	4	];
362
363			branches: [
364	abate	81	[ OPT "\|"; l = LIST1 branch SEP "\|" -> l ]
365	abate	4	];
366
367			branch: [
368	abate	6	[ p = pat LEVEL "no_arrow"; "->"; e = expr -> (p,e) ]
369	abate	4	];
370
371
372			regexp: [
373	abate	236	[ x = regexp; "\|"; y = regexp ->
374			match (x,y) with
375			\| Elem x, Elem y -> Elem (mk loc (Or (x,y)))
376			\| _ -> Alt (x,y)
377			]
378	abate	4	\| [ x = regexp; y = regexp -> Seq (x,y) ]
379	abate	375	\| [ a = LIDENT; "::"; x = regexp -> SeqCapture (ident a,x) ]
380	abate	4	\| [ x = regexp; "*" -> Star x
381			\| x = regexp; "*?" -> WeakStar x
382			\| x = regexp; "+" -> Seq (x, Star x)
383			\| x = regexp; "+?" -> Seq (x, WeakStar x)
384	abate	71	\| x = regexp; "?" -> Alt (x, Epsilon)
385	abate	4	\| x = regexp; "??" -> Alt (Epsilon, x) ]
386			\| [ "("; x = regexp; ")" -> x
387	abate	225	\| "("; a = LIDENT; ":="; c = const; ")" ->
388	abate	375	Elem (mk loc (Constant ((ident a,c))))
389	abate	66	\| UIDENT "PCDATA" -> string_regexp
390	abate	81	\| i = STRING1; "--"; j = STRING1 ->
391	abate	310	let i = Chars.mk_int (parse_char loc i)
392			and j = Chars.mk_int (parse_char loc j) in
393	abate	66	Elem (mk loc (Internal (Types.char (Chars.char_class i j))))
394	abate	81	\| s = STRING1 ->
395	abate	18	List.fold_right
396	abate	525	(fun c accu ->
397	abate	310	let c = Chars.mk_int c in
398	abate	18	let c = Chars.atom c in
399	abate	525	Seq (Elem (mknoloc (Internal (Types.char c))), accu))
400			(seq_of_string s)
401	abate	66	Epsilon
402	abate	4	\| e = pat LEVEL "simple" -> Elem e
403			]
404			];
405
406			pat: [
407	abate	332	[ x = pat; LIDENT "where";
408	abate	529	b = LIST1 [ a = uident; "="; y = pat -> (a,y)
409	abate	338	\| LIDENT -> error loc "Type/pattern identifiers must be capitalized"
410			] SEP "and"
411	abate	4	-> mk loc (Recurs (x,b)) ]
412			\| RIGHTA [ x = pat; "->"; y = pat -> mk loc (Arrow (x,y)) ]
413	abate	6	\| "no_arrow" [ x = pat; "\|"; y = pat -> mk loc (Or (x,y)) ]
414	abate	121	\| "simple" [ x = pat; "&"; y = pat -> mk loc (And (x,y))
415	abate	99	\| x = pat; "\\"; y = pat -> mk loc (Diff (x,y)) ]
416	abate	4	\|
417	abate	159	[ "{"; r = record_spec; "}" -> mk loc (Record (true,r))
418			\| "{\|"; r = record_spec; "\|}" -> mk loc (Record (false,r))
419	abate	4	\| LIDENT "_" -> mk loc (Internal Types.any)
420	abate	375	\| a = LIDENT -> mk loc (Capture (ident a))
421	abate	225	\| "("; a = LIDENT; ":="; c = const; ")" ->
422	abate	375	mk loc (Constant (ident a,c))
423	abate	501	\| schema = UIDENT; "#"; typ = [ UIDENT \| LIDENT \| keyword ];
424			k = OPT [ "as"; k = [ "element" \| "type" \| "attribute" ] -> k ] ->
425			let kind =
426			match k with
427			\| None -> `Any
428			\| Some "element" -> `Element
429			\| Some "type" -> `Type
430			\| Some "attribute" -> `Attribute
431			\| _ -> assert false
432			in
433			mk loc (SchemaVar (kind, schema, typ))
434	abate	529	\| a = uident -> mk loc (PatVar a)
435	abate	4	\| i = INT ; "--"; j = INT ->
436	abate	222	let i = Intervals.mk i
437			and j = Intervals.mk j in
438	abate	52	mk loc (Internal (Types.interval (Intervals.bounded i j)))
439			\| i = INT ->
440	abate	222	let i = Intervals.mk i in
441	abate	52	mk loc (Internal (Types.interval (Intervals.atom i)))
442	abate	81	\| "*"; "--"; j = INT ->
443	abate	222	let j = Intervals.mk j in
444	abate	52	mk loc (Internal (Types.interval (Intervals.left j)))
445	abate	81	\| i = INT; "--"; "*" ->
446	abate	222	let i = Intervals.mk i in
447	abate	52	mk loc (Internal (Types.interval (Intervals.right i)))
448	abate	19	\| i = char ->
449			mk loc (Internal (Types.char (Chars.char_class i i)))
450	abate	13	\| i = char ; "--"; j = char ->
451	abate	18	mk loc (Internal (Types.char (Chars.char_class i j)))
452	abate	529	\| "`"; c = tag_type -> c
453			\| c = const ->
454			(match c with
455			\| Const_atom (ns,l) -> mk loc (AtomT (ns,Some l))
456			\| Const_internal c ->
457			mk loc (Internal (Types.constant c))
458			)
459	abate	4	\| "("; l = LIST1 pat SEP ","; ")" -> multi_prod loc l
460			\| "["; r = [ r = regexp -> r \| -> Epsilon ];
461			q = [ ";"; q = pat -> q
462	abate	249	\| -> mknoloc (Internal (Sequence.nil_type)) ];
463	abate	4	"]" -> mk loc (Regexp (r,q))
464	abate	332	\| "<"; t =
465	abate	529	[ x = tag_type -> x
466			\| "("; t = pat; ")" -> t ];
467	abate	81	a = attrib_spec; ">"; c = pat ->
468	abate	529	(* let t = mk loc (Prod (mk loc (Internal Sequence.nil_type), t)) in *)
469	abate	110	mk loc (XmlT (t, multi_prod loc [a;c]))
470	abate	81	\| s = STRING2 ->
471	abate	525	let s =
472			List.map
473			(fun c ->
474			mknoloc (Internal
475			(Types.char
476			(Chars.atom
477			(Chars.mk_int c)))))
478			(seq_of_string s) in
479			let s = s @ [mknoloc (Internal (Sequence.nil_type))] in
480	abate	63	multi_prod loc s
481	abate	4	]
482
483			];
484
485			record_spec:
486	abate	339	[ [ r = LIST0 [ l = [LIDENT \| UIDENT \| keyword ]; "=";
487	abate	81	o = [ "?" -> true \| -> false];
488	abate	229	x = pat ->
489			let x = if o then mk loc (Optional x) else x in
490	abate	374	(label l, x)
491	abate	4	] SEP ";" ->
492	abate	233	make_record loc r
493	abate	4	] ];
494
495	abate	13	char:
496			[
497	abate	310	[ c = STRING1 -> Chars.mk_int (parse_char loc c) ]
498	abate	13	];
499
500
501	abate	4	const:
502			[
503	abate	529	[ i = INT -> Const_internal (Types.Integer (Intervals.mk i))
504			\| "`"; a = tag -> a
505			\| c = char -> Const_internal (Types.Char c) ]
506	abate	4	];
507
508
509			attrib_spec:
510	abate	159	[ [ r = record_spec -> mk loc (Record (true,r))
511	abate	252	\| "("; t = pat; ")" -> t
512			\| "{"; r = record_spec; "}" -> mk loc (Record (true,r))
513			\| "{\|"; r = record_spec; "\|}" -> mk loc (Record (false,r))
514			] ];
515	abate	4
516			expr_record_spec:
517			[ [ r = LIST1
518	abate	339	[ l = [LIDENT \| UIDENT \| keyword ]; "="; x = expr ->
519	abate	374	(label l,x) ]
520	abate	4	SEP ";" ->
521	abate	316	exp loc (RecordLitt (make_record loc r))
522	abate	4	] ];
523
524			expr_attrib_spec:
525			[ [ r = expr_record_spec -> r ]
526			\| [ e = expr LEVEL "no_appl" -> e
527	abate	316	\| -> exp loc (RecordLitt (LabelMap.empty))
528	abate	4	]
529			];
530			END
531
532	abate	10	let pat = Grammar.Entry.parse pat
533	abate	81	and expr = Grammar.Entry.parse expr
534			and prog = Grammar.Entry.parse prog
535	abate	431	and top_phrases = Grammar.Entry.parse top_phrases
536	abate	10
537	abate	495	let sync () =
538			match !Wlexer.lexbuf with
539			\| None -> ()
540			\| Some lb ->
541			let rec aux () =
542			match !Wlexer.last_tok with
543			\| ("",";;") \| ("EOI","") -> ()
544			\| _ ->
545			Wlexer.last_tok := Wlexer.token Wlexer.latin1_engine lb;
546			aux ()
547			in
548			aux ()