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 "$$$")

(* TODO: NS *)
let label = parse_ident
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 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))]
    | (name,ns) = namespace_binding ->
        [ mk loc (Namespace (name, ns)) ]
    | (name,ns) = namespace_binding; "in"; e2 = expr LEVEL "top" ->
        let e = exp loc (NamespaceIn (name, ns, e2)) in
        [ mk loc (EvalStatement (exp loc e)) ]
    | "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]))
    | (name,ns) = namespace_binding; "in"; e2 = expr LEVEL "top" ->
        exp loc (NamespaceIn (name, ns, 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 []) ]; "}" -> 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 ] -> 
             Const_atom (parse_ident a) ] ];

  tag_type: [
    [ LIDENT "_" ->  mk loc (Internal (Types.atom Atoms.any))
    | a = [ LIDENT | UIDENT | keyword ] -> mk loc (AtomT (parse_ident a))
    | t = ANY_IN_NS -> mk loc (NsT (parse_ident t)) 
    ]
  ];

  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
    ]
  ];
        
  namespace_binding: [
    [ "namespace"; 
        name = [ name = [ UIDENT | LIDENT | keyword ]; "=" ->
                   parse_ident name
               | -> U.mk "" ];
        uri = STRING2 ->
          let ns = Ns.mk (parse_ident uri) in
          (name,ns)
    ]
  ];

  
  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 l -> mk loc (AtomT 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 ";" ->
          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 r)
      ] ];
  
  expr_attrib_spec:
    [ [ r = expr_record_spec -> r ]
    | [ e = expr LEVEL "no_appl" -> e 
      | -> exp loc (RecordLitt []) 
      ] 
    ];
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	abate	542	(* TODO: NS *)
25	abate	549	let label = parse_ident
26	abate	375	let ident s = ident (parse_ident s)
27	abate	374
28	abate	38	let prog = Grammar.Entry.create gram "prog"
29	abate	431	let top_phrases = Grammar.Entry.create gram "toplevel phrases"
30	abate	38	let expr = Grammar.Entry.create gram "expression"
31			let pat = Grammar.Entry.create gram "type/pattern expression"
32			let regexp = Grammar.Entry.create gram "type/pattern regexp"
33			let const = Grammar.Entry.create gram "scalar constant"
34
35	abate	316	let exp pos e = LocatedExpr (loc_of_pos pos,e)
36
37	abate	38	let rec multi_prod loc = function
38			\| [ x ] -> x
39			\| x :: l -> mk loc (Prod (x, multi_prod loc l))
40			\| [] -> assert false
41
42	abate	316	let rec tuple = function
43	abate	38	\| [ x ] -> x
44	abate	316	\| x :: l -> Pair (x, tuple l)
45	abate	38	\| [] -> assert false
46	abate	89
47			let tuple_queue =
48	abate	316	List.fold_right (fun x q -> Pair (x, q))
49	abate	89
50	abate	233
51	abate	249	let char = mknoloc (Internal (Types.char Chars.any))
52	abate	66	let string_regexp = Star (Elem char)
53	abate	38
54	abate	529	let cst_nil = Cst (Const_internal (Types.Atom Sequence.nil_atom))
55	abate	38
56	abate	525	let seq_of_string s =
57	abate	326	let s = Encodings.Utf8.mk s in
58			let rec aux i j =
59	abate	525	if Encodings.Utf8.equal_index i j then []
60			else let (c,i) = Encodings.Utf8.next s i in c :: (aux i j)
61	abate	326	in
62	abate	525	aux (Encodings.Utf8.start_index s) (Encodings.Utf8.end_index s)
63	abate	326
64	abate	233
65	abate	81	let parse_char loc s =
66	abate	525	match seq_of_string s with
67			\| [ c ] -> c
68	abate	310	\| _ -> error loc "Character litteral must have length 1"
69	abate	81
70	abate	249	let include_stack = ref []
71
72	abate	448	let protect_exn f g =
73			try let x = f () in g (); x
74			with e -> g (); raise e
75
76	abate	470	let is_fun_decl =
77			Grammar.Entry.of_parser gram "[is_fun_decl]"
78			(fun strm ->
79			match Stream.npeek 3 strm with
80			\| [ ("", "fun"); ("LIDENT", _); ("", "(") ]
81			\| [ ("LIDENT", _) ; ("", "(") ; _ ] -> ()
82			\| _ -> raise Stream.Failure
83			)
84
85	abate	501	let dot_RE = Pcre.regexp "\\."
86	abate	470
87	abate	38	EXTEND
88	abate	431	GLOBAL: top_phrases prog expr pat regexp const;
89	abate	4
90	abate	431	top_phrases: [
91	abate	446	[ l = LIST0 phrase; ";;" -> List.flatten l ]
92	abate	431	];
93
94	abate	10	prog: [
95	abate	431	[ l = LIST0 [ p = phrase ; OPT ";;" -> p ]; EOI -> List.flatten l ]
96	abate	10	];
97
98	abate	529	uident: [ [ x = UIDENT -> parse_ident x ] ];
99
100	abate	13	phrase: [
101	abate	431	[ (f,p,e) = let_binding ->
102			if f then [ mk loc (FunDecl e) ] else
103			[ mk loc (LetDecl (p,e)) ]
104			\| (_,p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
105	abate	316	[ mk loc (EvalStatement (exp loc (Match (e1,[p,e2])))) ]
106	abate	529	\| "type"; x = uident; "="; t = pat -> [ mk loc (TypeDecl (x,t)) ]
107	abate	431	\| "type"; x = LIDENT -> error loc "Type identifiers must be capitalized"
108	abate	501	\| "schema"; name = UIDENT; "="; uri = STRING2 ->
109	abate	522	protect_op "schema";
110	abate	525	let schema_doc = Schema_xml.pxp_tree_of uri in
111	abate	501	let schema = Schema_parser.parse_schema schema_doc in
112			[ mk loc (SchemaDecl (name, schema))]
113	abate	530	\| (name,ns) = namespace_binding ->
114			[ mk loc (Namespace (name, ns)) ]
115			\| (name,ns) = namespace_binding; "in"; e2 = expr LEVEL "top" ->
116			let e = exp loc (NamespaceIn (name, ns, e2)) in
117			[ mk loc (EvalStatement (exp loc e)) ]
118	abate	431	\| "debug"; d = debug_directive -> [ mk loc (Debug d) ]
119	abate	446	\| DIRECTIVE "#quit" -> [ mk loc (Directive `Quit) ]
120			\| DIRECTIVE "#env" -> [ mk loc (Directive `Env) ]
121	abate	431	\| "include"; s = STRING2 ->
122	abate	471	let s =
123			if Filename.is_relative s
124			then Filename.concat (Location.current_dir ()) s
125			else s in
126	abate	249	protect_op "File inclusion";
127			(* avoid looping; should issue an error ? *)
128	abate	471	(* it is possible to have looping with x/../x/../x/.. ....
129			Need to canonicalize filename *)
130	abate	249	if List.mem s !include_stack then []
131			else (
132			include_stack := s :: !include_stack;
133			Location.push_source (`File s);
134	abate	448	protect_exn
135			(fun () ->
136			let chan = open_in s in
137	abate	471	protect_exn
138			(fun () ->
139			let input = Stream.of_channel chan in
140			Grammar.Entry.parse prog input)
141			(fun () -> close_in chan))
142	abate	448	(fun () ->
143			Location.pop_source ();
144			include_stack := List.tl !include_stack)
145	abate	249	)
146	abate	66	] \|
147	abate	249	[ e = expr -> [ mk loc (EvalStatement e) ]
148	abate	43	]
149	abate	13	];
150
151	abate	43	debug_directive: [
152			[ LIDENT "filter"; t = pat; p = pat -> `Filter(t,p)
153	abate	75	\| LIDENT "accept"; p = pat -> `Accept p
154	abate	43	\| LIDENT "compile"; t = pat; p = LIST1 pat -> `Compile (t,p)
155	abate	407	\| LIDENT "sample"; t = pat -> `Sample t
156	abate	224	\| LIDENT "subtype"; t1 = pat; t2 = pat -> `Subtype (t1,t2)
157	abate	43	]
158			];
159
160	abate	332	keyword: [
161			[ a =
162			[ "map" \| "match" \| "with" \| "try" \| "xtransform"
163			\| "if" \| "then" \| "else"
164			\| "transform" \| "fun" \| "in"
165	abate	431	\| "let" \| "type" \| "debug" \| "include"
166	abate	529	\| "and" \| "validate" \| "schema" \| "namespace"
167	abate	332	]
168			-> a
169			]
170			];
171
172	abate	4	expr: [
173			"top" RIGHTA
174	abate	421	[ "match"; e = SELF; "with"; b = branches ->
175			exp loc (Match (e,b))
176	abate	64	\| "try"; e = SELF; "with"; b = branches ->
177	abate	425	exp loc (Try (e,b))
178	abate	421	\| "map"; e = SELF; "with"; b = branches ->
179			exp loc (Map (e,b))
180			\| "xtransform"; e = SELF; "with"; b = branches ->
181			exp loc (Xtrans (e,b))
182	abate	237	\| "if"; e = SELF; "then"; e1 = SELF; "else"; e2 = SELF ->
183	abate	421	let p1 = mk loc (Internal true_type)
184			and p2 = mk loc (Internal false_type) in
185	abate	316	exp loc (Match (e, [p1,e1; p2,e2]))
186	abate	17	\| "transform"; e = SELF; "with"; b = branches ->
187	abate	421	exp loc (Transform (e,b))
188	abate	501	\| "validate"; e = SELF; "with"; schema = UIDENT; "#";
189			typ = [ UIDENT \| LIDENT \| keyword ] ->
190			exp loc (Validate (e, schema, typ))
191	abate	48	\| "fun"; (f,a,b) = fun_decl ->
192	abate	316	exp loc (Abstraction { fun_name = f; fun_iface = a; fun_body = b })
193	abate	431	\| (_,p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
194	abate	316	exp loc (Match (e1,[p,e2]))
195	abate	530	\| (name,ns) = namespace_binding; "in"; e2 = expr LEVEL "top" ->
196			exp loc (NamespaceIn (name, ns, e2))
197	abate	54	\| e = expr; ":"; p = pat ->
198	abate	316	exp loc (Forget (e,p))
199	abate	4	]
200
201
202	abate	15	\|
203	abate	237	[ e1 = expr; op = ["=" \| "<=" \| "<<" \| ">>" \| ">=" ]; e2 = expr ->
204			let op = match op with
205			\| "<<" -> "<"
206			\| ">>" -> ">"
207			\| s -> s in
208	abate	316	exp loc (Op (op,[e1;e2]))
209	abate	237	]
210
211			\|
212	abate	242	[ e1 = expr; op = ["+" \| "-" \| "@" ]; e2 = expr ->
213	abate	316	exp loc (Op (op,[e1;e2]))
214	abate	339	\| e = expr; "\\"; l = [LIDENT \| UIDENT \| keyword ] ->
215	abate	374	exp loc (RemoveField (e, label l))
216	abate	51	]
217	abate	16	\|
218	abate	316	[ e1 = expr; op = ["*"]; e2 = expr -> exp loc (Op (op,[e1;e2]))
219	abate	151	\| e = expr; op = "/"; p = pat ->
220
221			let tag = mk loc (Internal (Types.atom (Atoms.any))) in
222			let att = mk loc (Internal Types.Record.any) in
223			let any = mk loc (Internal (Types.any)) in
224	abate	375	let re = Star(Alt(SeqCapture(id_dummy,Elem p), Elem any)) in
225	abate	151	let ct = mk loc (Regexp (re,any)) in
226			let p = mk loc (XmlT (tag, multi_prod loc [att;ct])) in
227	abate	375	let b = (p, Var id_dummy) in
228	abate	421	exp loc (Transform (e,[b]))
229	abate	51	]
230	abate	26	\|
231	abate	339	[ e = expr; "."; l = [LIDENT \| UIDENT \| keyword ] ->
232	abate	374	exp loc (Dot (e, label l))
233	abate	51	]
234	abate	26
235	abate	52	\|
236	abate	66	[ op = [ LIDENT "flatten"
237			\| LIDENT "load_xml"
238	abate	374	\| LIDENT "load_file" \| LIDENT "load_file_utf8"
239	abate	188	\| LIDENT "load_html"
240	abate	374	\| LIDENT "print_xml" \| LIDENT "print_xml_utf8"
241	abate	124	\| LIDENT "print"
242	abate	66	\| LIDENT "int_of"
243	abate	133	\| LIDENT "string_of"
244	abate	329	\| LIDENT "atom_of"
245	abate	421	\| LIDENT "raise"
246	abate	66	];
247	abate	316	e = expr -> exp loc (Op (op,[e]))
248	abate	374	\| op = [ LIDENT "dump_to_file" \| LIDENT "dump_to_file_utf8" ];
249	abate	316	e1 = expr LEVEL "no_appl"; e2 = expr -> exp loc (Op (op, [e1;e2]))
250			\| e1 = SELF; LIDENT "div"; e2 = expr -> exp loc (Op ("/", [e1;e2]))
251			\| e1 = SELF; LIDENT "mod"; e2 = expr -> exp loc (Op ("mod", [e1;e2]))
252			\| e1 = SELF; e2 = expr -> exp loc (Apply (e1,e2))
253	abate	52	]
254
255	abate	4	\| "no_appl"
256	abate	316	[ c = const -> exp loc (Cst c)
257			\| "("; l = LIST1 expr SEP ","; ")" -> exp loc (tuple l)
258	abate	18	\| "["; l = LIST0 seq_elem; e = OPT [ ";"; e = expr -> e ]; "]" ->
259			let e = match e with Some e -> e \| None -> cst_nil in
260	abate	321	let l = List.fold_right
261			(fun x q ->
262			match x with
263	abate	522	\| `String (loc,i,j,s) -> exp loc (String (i,j,s,q))
264	abate	321	\| `Elems l -> tuple_queue l q
265			\| `Explode x -> Op ("@",[x;q])
266			) l e
267			in
268			exp loc l
269	abate	332	\| "<"; t = [ "("; e = expr; ")" -> e
270	abate	529	\| a = tag -> exp loc (Cst a)
271			];
272	abate	81	a = expr_attrib_spec; ">"; c = expr ->
273	abate	529	(* let t = Pair (cst_nil, t) in *)
274			exp loc (Xml (t, Pair (a,c)))
275	abate	549	\| "{"; r = [ expr_record_spec \| -> exp loc (RecordLitt []) ]; "}" -> r
276	abate	81	\| s = STRING2 ->
277	abate	525	let s = U.mk s in
278	abate	522	exp loc (String (U.start_index s, U.end_index s, s, cst_nil))
279	abate	375	\| a = LIDENT -> exp loc (Var (ident a))
280	abate	4	]
281
282			];
283	abate	18
284	abate	529	tag: [ [ a = [ LIDENT \| UIDENT \| keyword ] ->
285	abate	542	Const_atom (parse_ident a) ] ];
286	abate	529
287			tag_type: [
288			[ LIDENT "_" -> mk loc (Internal (Types.atom Atoms.any))
289	abate	542	\| a = [ LIDENT \| UIDENT \| keyword ] -> mk loc (AtomT (parse_ident a))
290			\| t = ANY_IN_NS -> mk loc (NsT (parse_ident t))
291	abate	529	]
292			];
293
294	abate	18	seq_elem: [
295	abate	522	[ x = STRING1 ->
296	abate	525	let s = U.mk x in
297	abate	522	`String (loc, U.start_index s, U.end_index s, s)
298	abate	89	\| e = expr LEVEL "no_appl" -> `Elems [e]
299			\| "!"; e = expr LEVEL "no_appl" -> `Explode e
300	abate	18	]
301			];
302	abate	530
303			namespace_binding: [
304			[ "namespace";
305			name = [ name = [ UIDENT \| LIDENT \| keyword ]; "=" ->
306			parse_ident name
307			\| -> U.mk "" ];
308			uri = STRING2 ->
309	abate	542	let ns = Ns.mk (parse_ident uri) in
310	abate	530	(name,ns)
311			]
312			];
313
314
315	abate	4	let_binding: [
316	abate	470	[ "let"; is_fun_decl; OPT "fun"; (f,a,b) = fun_decl ->
317			let f = match f with Some x -> x \| None -> assert false in
318			let p = mk loc (Capture f) in
319			let abst = { fun_name = Some f; fun_iface = a; fun_body = b } in
320	abate	316	let e = exp loc (Abstraction abst) in
321	abate	431	(true,p,e)
322	abate	470	\| "let"; p = pat; "="; e = expr -> (false,p,e)
323			\| "let"; p = pat; ":"; t = pat; "="; e = expr -> (false,p, Forget (e,t))
324	abate	4	]
325			];
326
327	abate	470	fun_decl_after_lparen: [
328	abate	85	(* need an hack to do this, because both productions would
329			match [ OPT LIDENT; "("; pat ] .... *)
330	abate	470	[ p1 = pat LEVEL "no_arrow";
331			res = [ "->"; p2 = pat;
332			a = [ ";"; a = LIST0 arrow SEP ";" -> a \| -> [] ];
333			")"; b = branches -> `Classic (p2,a,b)
334			\| ":"; targ1 = pat;
335			args = LIST0 [ ","; arg = pat; ":"; targ = pat -> (arg,targ) ];
336			")"; ":"; tres = pat ;
337			"="; body = expr ->
338			`Compact (targ1,args,tres,body)
339			] ->
340			match res with
341			\| `Classic (p2,a,b) -> (p1,p2)::a,b
342			\| `Compact (targ1,args,tres,body) ->
343			let args = (p1,targ1) :: args in
344			let targ = multi_prod nopos (List.map snd args) in
345			let arg = multi_prod nopos (List.map fst args) in
346			let b = [arg, body] in
347			let a = [targ,tres] in
348			(a,b) ] ];
349
350
351			fun_decl: [
352			[ f = OPT [ x = LIDENT -> ident x]; "("; (a,b) = fun_decl_after_lparen ->
353	abate	85	(f,a,b)
354	abate	470	]
355	abate	48	];
356
357	abate	85	arrow: [
358	abate	9	[ t1 = pat LEVEL "no_arrow"; "->"; t2 = pat -> (t1,t2)]
359	abate	4	];
360
361			branches: [
362	abate	81	[ OPT "\|"; l = LIST1 branch SEP "\|" -> l ]
363	abate	4	];
364
365			branch: [
366	abate	6	[ p = pat LEVEL "no_arrow"; "->"; e = expr -> (p,e) ]
367	abate	4	];
368
369
370			regexp: [
371	abate	236	[ x = regexp; "\|"; y = regexp ->
372			match (x,y) with
373			\| Elem x, Elem y -> Elem (mk loc (Or (x,y)))
374			\| _ -> Alt (x,y)
375			]
376	abate	4	\| [ x = regexp; y = regexp -> Seq (x,y) ]
377	abate	375	\| [ a = LIDENT; "::"; x = regexp -> SeqCapture (ident a,x) ]
378	abate	4	\| [ x = regexp; "*" -> Star x
379			\| x = regexp; "*?" -> WeakStar x
380			\| x = regexp; "+" -> Seq (x, Star x)
381			\| x = regexp; "+?" -> Seq (x, WeakStar x)
382	abate	71	\| x = regexp; "?" -> Alt (x, Epsilon)
383	abate	4	\| x = regexp; "??" -> Alt (Epsilon, x) ]
384			\| [ "("; x = regexp; ")" -> x
385	abate	225	\| "("; a = LIDENT; ":="; c = const; ")" ->
386	abate	375	Elem (mk loc (Constant ((ident a,c))))
387	abate	66	\| UIDENT "PCDATA" -> string_regexp
388	abate	81	\| i = STRING1; "--"; j = STRING1 ->
389	abate	310	let i = Chars.mk_int (parse_char loc i)
390			and j = Chars.mk_int (parse_char loc j) in
391	abate	66	Elem (mk loc (Internal (Types.char (Chars.char_class i j))))
392	abate	81	\| s = STRING1 ->
393	abate	18	List.fold_right
394	abate	525	(fun c accu ->
395	abate	310	let c = Chars.mk_int c in
396	abate	18	let c = Chars.atom c in
397	abate	525	Seq (Elem (mknoloc (Internal (Types.char c))), accu))
398			(seq_of_string s)
399	abate	66	Epsilon
400	abate	4	\| e = pat LEVEL "simple" -> Elem e
401			]
402			];
403
404			pat: [
405	abate	332	[ x = pat; LIDENT "where";
406	abate	529	b = LIST1 [ a = uident; "="; y = pat -> (a,y)
407	abate	338	\| LIDENT -> error loc "Type/pattern identifiers must be capitalized"
408			] SEP "and"
409	abate	4	-> mk loc (Recurs (x,b)) ]
410			\| RIGHTA [ x = pat; "->"; y = pat -> mk loc (Arrow (x,y)) ]
411	abate	6	\| "no_arrow" [ x = pat; "\|"; y = pat -> mk loc (Or (x,y)) ]
412	abate	121	\| "simple" [ x = pat; "&"; y = pat -> mk loc (And (x,y))
413	abate	99	\| x = pat; "\\"; y = pat -> mk loc (Diff (x,y)) ]
414	abate	4	\|
415	abate	159	[ "{"; r = record_spec; "}" -> mk loc (Record (true,r))
416			\| "{\|"; r = record_spec; "\|}" -> mk loc (Record (false,r))
417	abate	4	\| LIDENT "_" -> mk loc (Internal Types.any)
418	abate	375	\| a = LIDENT -> mk loc (Capture (ident a))
419	abate	225	\| "("; a = LIDENT; ":="; c = const; ")" ->
420	abate	375	mk loc (Constant (ident a,c))
421	abate	501	\| schema = UIDENT; "#"; typ = [ UIDENT \| LIDENT \| keyword ];
422			k = OPT [ "as"; k = [ "element" \| "type" \| "attribute" ] -> k ] ->
423			let kind =
424			match k with
425			\| None -> `Any
426			\| Some "element" -> `Element
427			\| Some "type" -> `Type
428			\| Some "attribute" -> `Attribute
429			\| _ -> assert false
430			in
431			mk loc (SchemaVar (kind, schema, typ))
432	abate	529	\| a = uident -> mk loc (PatVar a)
433	abate	4	\| i = INT ; "--"; j = INT ->
434	abate	222	let i = Intervals.mk i
435			and j = Intervals.mk j in
436	abate	52	mk loc (Internal (Types.interval (Intervals.bounded i j)))
437			\| i = INT ->
438	abate	222	let i = Intervals.mk i in
439	abate	52	mk loc (Internal (Types.interval (Intervals.atom i)))
440	abate	81	\| "*"; "--"; j = INT ->
441	abate	222	let j = Intervals.mk j in
442	abate	52	mk loc (Internal (Types.interval (Intervals.left j)))
443	abate	81	\| i = INT; "--"; "*" ->
444	abate	222	let i = Intervals.mk i in
445	abate	52	mk loc (Internal (Types.interval (Intervals.right i)))
446	abate	19	\| i = char ->
447			mk loc (Internal (Types.char (Chars.char_class i i)))
448	abate	13	\| i = char ; "--"; j = char ->
449	abate	18	mk loc (Internal (Types.char (Chars.char_class i j)))
450	abate	529	\| "`"; c = tag_type -> c
451			\| c = const ->
452			(match c with
453	abate	542	\| Const_atom l -> mk loc (AtomT l)
454			\| Const_internal c -> mk loc (Internal (Types.constant c))
455	abate	529	)
456	abate	4	\| "("; l = LIST1 pat SEP ","; ")" -> multi_prod loc l
457			\| "["; r = [ r = regexp -> r \| -> Epsilon ];
458			q = [ ";"; q = pat -> q
459	abate	249	\| -> mknoloc (Internal (Sequence.nil_type)) ];
460	abate	4	"]" -> mk loc (Regexp (r,q))
461	abate	332	\| "<"; t =
462	abate	529	[ x = tag_type -> x
463			\| "("; t = pat; ")" -> t ];
464	abate	81	a = attrib_spec; ">"; c = pat ->
465	abate	529	(* let t = mk loc (Prod (mk loc (Internal Sequence.nil_type), t)) in *)
466	abate	110	mk loc (XmlT (t, multi_prod loc [a;c]))
467	abate	81	\| s = STRING2 ->
468	abate	525	let s =
469			List.map
470			(fun c ->
471			mknoloc (Internal
472			(Types.char
473			(Chars.atom
474			(Chars.mk_int c)))))
475			(seq_of_string s) in
476			let s = s @ [mknoloc (Internal (Sequence.nil_type))] in
477	abate	63	multi_prod loc s
478	abate	4	]
479
480			];
481
482			record_spec:
483	abate	339	[ [ r = LIST0 [ l = [LIDENT \| UIDENT \| keyword ]; "=";
484	abate	81	o = [ "?" -> true \| -> false];
485	abate	229	x = pat ->
486			let x = if o then mk loc (Optional x) else x in
487	abate	374	(label l, x)
488	abate	4	] SEP ";" ->
489	abate	549	r
490	abate	4	] ];
491
492	abate	13	char:
493			[
494	abate	310	[ c = STRING1 -> Chars.mk_int (parse_char loc c) ]
495	abate	13	];
496
497
498	abate	4	const:
499			[
500	abate	529	[ i = INT -> Const_internal (Types.Integer (Intervals.mk i))
501			\| "`"; a = tag -> a
502			\| c = char -> Const_internal (Types.Char c) ]
503	abate	4	];
504
505
506			attrib_spec:
507	abate	159	[ [ r = record_spec -> mk loc (Record (true,r))
508	abate	252	\| "("; t = pat; ")" -> t
509			\| "{"; r = record_spec; "}" -> mk loc (Record (true,r))
510			\| "{\|"; r = record_spec; "\|}" -> mk loc (Record (false,r))
511			] ];
512	abate	4
513			expr_record_spec:
514			[ [ r = LIST1
515	abate	339	[ l = [LIDENT \| UIDENT \| keyword ]; "="; x = expr ->
516	abate	374	(label l,x) ]
517	abate	4	SEP ";" ->
518	abate	549	exp loc (RecordLitt r)
519	abate	4	] ];
520
521			expr_attrib_spec:
522			[ [ r = expr_record_spec -> r ]
523			\| [ e = expr LEVEL "no_appl" -> e
524	abate	549	\| -> exp loc (RecordLitt [])
525	abate	4	]
526			];
527			END
528
529	abate	10	let pat = Grammar.Entry.parse pat
530	abate	81	and expr = Grammar.Entry.parse expr
531			and prog = Grammar.Entry.parse prog
532	abate	431	and top_phrases = Grammar.Entry.parse top_phrases
533	abate	10
534	abate	495	let sync () =
535			match !Wlexer.lexbuf with
536			\| None -> ()
537			\| Some lb ->
538			let rec aux () =
539			match !Wlexer.last_tok with
540			\| ("",";;") \| ("EOI","") -> ()
541			\| _ ->
542			Wlexer.last_tok := Wlexer.token Wlexer.latin1_engine lb;
543			aux ()
544			in
545			aux ()