viewcvs.cgi/parser/parser.ml

open Location
open Ast

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

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


let prog    = Grammar.Entry.create gram "prog"
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 rec multi_prod loc = function
  | [ x ] -> x
  | x :: l -> mk loc (Prod (x, multi_prod loc l))
  | [] -> assert false
      
let rec tuple loc = function
  | [ x ] -> x
  | x :: l -> mk loc (Pair (x, tuple loc l))
  | [] -> assert false

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

let char = mk noloc (Internal (Types.char Chars.any))
let string_regexp = Star (Elem char)
               
let cst_nil =  mk noloc (Cst (Types.Atom Sequence.nil_atom))
                 
let seq_of_string pos s =
  let (pos,_) = pos in
  let rec aux accu i = 
    if (i = 0) 
    then accu 
    else aux (((pos+i,pos+i+1),s.[i-1])::accu) (i-1) in
  aux [] (String.length s)

exception Error of string
let error loc s = raise (Location (loc, Error s))

let parse_char loc s =
  (* TODO: Unicode *)
  if String.length s <> 1 then
    error loc "Character litteral must have length 1";
  s.[0]

let char_list pos s = 
  let s = seq_of_string pos s in
  List.map (fun (loc,c) -> mk loc (Cst (Types.Char (Chars.mk_char c)))) s


EXTEND
  GLOBAL: prog expr pat regexp const;

  prog: [
    [ l = LIST0 [ p = phrase; ";;" -> mk loc p ]; EOI -> l ]
  ];

  phrase: [
    [ (p,e) = let_binding -> LetDecl (p,e)
    | (p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
        EvalStatement (mk loc (Match (e1,[p,e2])))
    | LIDENT "type"; x = UIDENT; "="; t = pat -> TypeDecl (x,t)
    | LIDENT "debug"; d = debug_directive -> Debug d
    ] | 
    [ e = expr -> 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 "normal_record"; t = pat -> `Normal_record t
    | LIDENT "compile2"; t = pat; p = LIST1 pat -> `Compile2 (t,p)
    | LIDENT "subtype"; t1 = pat; t2 = pat -> `Subtype (t1,t2)
    ]
  ];

  expr: [
    "top" RIGHTA
    [ "match"; e = SELF; "with"; b = branches -> mk loc (Match (e,b))
    | "try"; e = SELF; "with"; b = branches -> 
        let default = 
          (mk noloc (Capture "x"),
           mk noloc (Op ("raise",[mk noloc (Var "x")]))) in
        mk loc (Try (e,b@[default]))
    | "map"; e = SELF; "with"; b = branches -> mk loc (Map (e,b))
    | "transform"; e = SELF; "with"; b = branches -> 
        let default = mk noloc (Capture "x"), cst_nil in
        mk loc (Op ("flatten", [mk loc (Map (e,b@[default]))]))
    | "fun"; (f,a,b) = fun_decl ->
        mk loc (Abstraction { fun_name = f; fun_iface = a; fun_body = b })
    | (p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
        mk loc (Match (e1,[p,e2]))
    | e = expr; ":"; p = pat ->
        mk loc (Forget (e,p))
    ]

    
    | 
    [ e1 = expr; op = ["+" | "-" | "@"]; e2 = expr -> mk loc (Op (op,[e1;e2]))
    ]
    |
    [ e1 = expr; op = ["*"]; e2 = expr -> mk 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("x",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,  mk loc (Var "x")) in
        mk loc (Op ("flatten", [mk loc (Map (e,[b]))]))
    ]
    |
    [ e = expr;  "."; l = [LIDENT | UIDENT] -> 
        mk loc (Dot (e,Types.LabelPool.mk l)) 
    ]  
 
    |
    [ op = [ LIDENT "flatten"
           | LIDENT "load_xml"
           | LIDENT "load_html"
           | LIDENT "print_xml"
           | LIDENT "print"
           | LIDENT "raise" 
           | LIDENT "int_of"
           | LIDENT "string_of"
           ]; 
      e = expr -> mk loc (Op (op,[e]))
    | op = [ LIDENT "dump_to_file" ];
      e1 = expr LEVEL "no_appl"; e2 = expr -> mk loc (Op (op, [e1;e2])) 
    | e1 = SELF; LIDENT "div"; e2 = expr -> mk loc (Op ("/", [e1;e2]))
    | e1 = SELF; LIDENT "mod"; e2 = expr -> mk loc (Op ("mod", [e1;e2]))
    | e1 = SELF; e2 = expr -> mk loc (Apply (e1,e2))
    ]

    | "no_appl" 
    [ c = const -> mk loc (Cst c)
    | "("; l = LIST1 expr SEP ","; ")" -> tuple loc l
    | "[";  l = LIST0 seq_elem; e = OPT [ ";"; e = expr -> e ]; "]" ->
        let e = match e with Some e -> e | None -> cst_nil in
        List.fold_right 
          (fun x q ->
             match x with
               | `Elems l -> tuple_queue l q
               | `Explode x -> mk x.loc (Op ("@",[x;q]))
          ) l e
    | t = [ a = TAG -> 
              mk loc (Cst (Types.Atom (Atoms.mk a)))
          | "<"; e = expr LEVEL "no_appl" -> e ];
        a = expr_attrib_spec; ">"; c = expr ->
        mk loc (Xml (t, mk loc (Pair (a,c))))
    | "{"; r = [ expr_record_spec | -> mk loc (RecordLitt []) ]; "}" -> r
    | s = STRING2 ->
        tuple loc (char_list loc s @ [cst_nil])
    | a = LIDENT -> mk loc (Var a)
    ]

  ];

  seq_elem: [
    [ x = STRING1 -> `Elems (char_list loc x)
    | e = expr LEVEL "no_appl" -> `Elems [e]
    | "!"; e = expr LEVEL "no_appl" -> `Explode e
    ]
  ];
          
  let_binding: [
    [ "let"; p = pat; "="; e = expr -> (p,e)
    | "let"; p = pat; ":"; t = pat; "="; e = expr -> (p, mk noloc (Forget (e,t)))
    | "let"; "fun"; (f,a,b) = fun_decl ->
        let p = match f with 
          | Some x -> mk loc (Capture x)
          | _ -> failwith "Function name mandatory in let fun declarations"
        in
        let abst = { fun_name = f; fun_iface = a; fun_body = b } in
        let e = mk loc (Abstraction abst) in
        (p,e);
    ] 
  ];

 fun_decl: [
(* need an hack to do this, because both productions would
   match   [ OPT LIDENT; "("; pat ] .... *)
   [ f = OPT LIDENT; "("; 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) -> f,(p1,p2)::a,b
        | `Compact (targ1,args,tres,body) ->
            let args = (p1,targ1) :: args in
            let targ = multi_prod noloc (List.map snd args) in
            let arg = multi_prod noloc (List.map fst args) in
            let b = [arg, body] in
            let a = [targ,tres] in
            (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 -> Alt (x,y) ]
  | [ x = regexp; y = regexp -> Seq (x,y) ]
  | [ a = LIDENT; "::"; x = regexp -> SeqCapture (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 (a,c)))
    | UIDENT "PCDATA" -> string_regexp
    | i = STRING1; "--"; j = STRING1 ->
        let i = Chars.mk_char (parse_char loc i)
        and j = Chars.mk_char (parse_char loc j) in
        Elem (mk loc (Internal (Types.char (Chars.char_class i j))))
    |  s = STRING1 ->
        let s = seq_of_string loc s in
        List.fold_right
          (fun (loc,c) accu -> 
             let c = Chars.mk_char c in
             let c = Chars.atom c in
             Seq (Elem (mk loc (Internal (Types.char c))), accu))
          s
          Epsilon 
    | e = pat LEVEL "simple" -> Elem e
    ]
  ];

  pat: [ 
      [ x = pat; "where"; 
        b = LIST1 [ a = UIDENT; "="; y = pat -> (a,y)] 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 a)
      | "("; a = LIDENT; ":="; c = const; ")" -> mk loc (Constant (a,c))
      | 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 = const -> mk loc (Internal (Types.constant c))
      | "("; l = LIST1 pat SEP ","; ")" -> multi_prod loc l
      | "["; r = [ r = regexp -> r | -> Epsilon ];
             q = [ ";"; q = pat -> q 
                 | -> mk noloc (Internal (Sequence.nil_type)) ]; 
             "]" -> mk loc (Regexp (r,q))
      | t = [
          [ "<"; LIDENT "_" -> mk loc (Internal (Types.atom (Atoms.any)))
          | a = TAG -> 
              mk loc 
              (Internal (Types.atom (Atoms.atom (Atoms.mk a)))) ]
        | [ "<"; t = pat -> t ]
        ];
        a = attrib_spec; ">"; c = pat ->
          mk loc (XmlT (t, multi_prod loc [a;c]))
      | s = STRING2 ->
          let s = seq_of_string loc s in
          let s = List.map 
                    (fun (loc,c) -> 
                       mk loc (Internal
                                 (Types.char
                                    (Chars.atom
                                       (Chars.mk_char c))))) s in
          let s = s @ [mk loc (Internal (Sequence.nil_type))] in
          multi_prod loc s
      ]
    
  ];

  record_spec:
    [ [ r = LIST0 [ l = [LIDENT | UIDENT]; "=";
                  o = [ "?" -> true | -> false]; 
                  x = pat -> (Types.LabelPool.mk l,o,x)
                ] SEP ";" ->
          (* TODO: check here uniqueness *)
          List.sort (fun (l1,_,_) (l2,_,_) -> compare l1 l2) r
      ] ];
  
  char:
    [ 
      [ c = STRING1 -> Chars.mk_char (parse_char loc c)
      | "!"; i = INT -> Chars.mk_int (int_of_string i) ]
    ];
     

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


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

  expr_record_spec:
    [ [ r = LIST1
              [ l = [LIDENT | UIDENT]; "="; x = expr -> 
                  (Types.LabelPool.mk l,x) ] 
              SEP ";" ->
          mk loc (RecordLitt r)
      ] ];
  
  expr_attrib_spec:
    [ [ r = expr_record_spec -> r ]
    | [ e = expr LEVEL "no_appl" -> e 
      | -> mk loc (RecordLitt []) 
      ] 
    ];
END

let pat'  = Grammar.Entry.create gram "type/pattern expression"
EXTEND GLOBAL: pat pat';
  pat': [  [ p = pat; EOI -> p ] ];
END

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

module From_string = struct
  let pat s = Grammar.Entry.parse pat' (Stream.of_string s)
  let expr s = expr (Stream.of_string s)
end

1	abate	4	open Location
2			open Ast
3
4	abate	161	(*
5	abate	151	let () = Grammar.error_verbose := true
6	abate	161	*)
7	abate	81
8			let gram = Grammar.gcreate (Wlexer.lexer Wlexer.token Wlexer.latin1_engine)
9
10
11	abate	38	let prog = Grammar.Entry.create gram "prog"
12			let expr = Grammar.Entry.create gram "expression"
13			let pat = Grammar.Entry.create gram "type/pattern expression"
14			let regexp = Grammar.Entry.create gram "type/pattern regexp"
15			let const = Grammar.Entry.create gram "scalar constant"
16
17			let rec multi_prod loc = function
18			\| [ x ] -> x
19			\| x :: l -> mk loc (Prod (x, multi_prod loc l))
20			\| [] -> assert false
21
22			let rec tuple loc = function
23			\| [ x ] -> x
24	abate	91	\| x :: l -> mk loc (Pair (x, tuple loc l))
25	abate	38	\| [] -> assert false
26	abate	89
27			let tuple_queue =
28			List.fold_right (fun x q -> mk x.loc (Pair (x, q)))
29
30	abate	38	let char = mk noloc (Internal (Types.char Chars.any))
31	abate	66	let string_regexp = Star (Elem char)
32	abate	38
33			let cst_nil = mk noloc (Cst (Types.Atom Sequence.nil_atom))
34
35	abate	66	let seq_of_string pos s =
36			let (pos,_) = pos in
37			let rec aux accu i =
38			if (i = 0)
39			then accu
40			else aux (((pos+i,pos+i+1),s.[i-1])::accu) (i-1) in
41	abate	38	aux [] (String.length s)
42	abate	4
43	abate	81	exception Error of string
44			let error loc s = raise (Location (loc, Error s))
45	abate	18
46	abate	81	let parse_char loc s =
47			(* TODO: Unicode *)
48			if String.length s <> 1 then
49			error loc "Character litteral must have length 1";
50			s.[0]
51
52	abate	66	let char_list pos s =
53	abate	81	let s = seq_of_string pos s in
54	abate	222	List.map (fun (loc,c) -> mk loc (Cst (Types.Char (Chars.mk_char c)))) s
55	abate	18
56
57	abate	38	EXTEND
58	abate	10	GLOBAL: prog expr pat regexp const;
59	abate	4
60	abate	10	prog: [
61	abate	14	[ l = LIST0 [ p = phrase; ";;" -> mk loc p ]; EOI -> l ]
62	abate	10	];
63
64	abate	13	phrase: [
65	abate	66	[ (p,e) = let_binding -> LetDecl (p,e)
66			\| (p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
67			EvalStatement (mk loc (Match (e1,[p,e2])))
68	abate	81	\| LIDENT "type"; x = UIDENT; "="; t = pat -> TypeDecl (x,t)
69			\| LIDENT "debug"; d = debug_directive -> Debug d
70	abate	66	] \|
71			[ e = expr -> EvalStatement e
72	abate	43	]
73	abate	13	];
74
75	abate	43	debug_directive: [
76			[ LIDENT "filter"; t = pat; p = pat -> `Filter(t,p)
77	abate	75	\| LIDENT "accept"; p = pat -> `Accept p
78	abate	43	\| LIDENT "compile"; t = pat; p = LIST1 pat -> `Compile (t,p)
79	abate	75	\| LIDENT "normal_record"; t = pat -> `Normal_record t
80	abate	145	\| LIDENT "compile2"; t = pat; p = LIST1 pat -> `Compile2 (t,p)
81	abate	224	\| LIDENT "subtype"; t1 = pat; t2 = pat -> `Subtype (t1,t2)
82	abate	43	]
83			];
84
85	abate	4	expr: [
86			"top" RIGHTA
87			[ "match"; e = SELF; "with"; b = branches -> mk loc (Match (e,b))
88	abate	64	\| "try"; e = SELF; "with"; b = branches ->
89			let default =
90			(mk noloc (Capture "x"),
91			mk noloc (Op ("raise",[mk noloc (Var "x")]))) in
92			mk loc (Try (e,b@[default]))
93	abate	81	\| "map"; e = SELF; "with"; b = branches -> mk loc (Map (e,b))
94	abate	17	\| "transform"; e = SELF; "with"; b = branches ->
95	abate	121	let default = mk noloc (Capture "x"), cst_nil in
96			mk loc (Op ("flatten", [mk loc (Map (e,b@[default]))]))
97	abate	48	\| "fun"; (f,a,b) = fun_decl ->
98	abate	4	mk loc (Abstraction { fun_name = f; fun_iface = a; fun_body = b })
99			\| (p,e1) = let_binding; "in"; e2 = expr LEVEL "top"->
100			mk loc (Match (e1,[p,e2]))
101	abate	54	\| e = expr; ":"; p = pat ->
102			mk loc (Forget (e,p))
103	abate	4	]
104
105
106	abate	15	\|
107	abate	51	[ e1 = expr; op = ["+" \| "-" \| "@"]; e2 = expr -> mk loc (Op (op,[e1;e2]))
108			]
109	abate	16	\|
110	abate	151	[ e1 = expr; op = ["*"]; e2 = expr -> mk loc (Op (op,[e1;e2]))
111			\| e = expr; op = "/"; p = pat ->
112
113			let tag = mk loc (Internal (Types.atom (Atoms.any))) in
114			let att = mk loc (Internal Types.Record.any) in
115			let any = mk loc (Internal (Types.any)) in
116			let re = Star(Alt(SeqCapture("x",Elem p), Elem any)) in
117			let ct = mk loc (Regexp (re,any)) in
118			let p = mk loc (XmlT (tag, multi_prod loc [att;ct])) in
119			let b = (p, mk loc (Var "x")) in
120			mk loc (Op ("flatten", [mk loc (Map (e,[b]))]))
121	abate	51	]
122	abate	26	\|
123	abate	78	[ e = expr; "."; l = [LIDENT \| UIDENT] ->
124			mk loc (Dot (e,Types.LabelPool.mk l))
125	abate	51	]
126	abate	26
127	abate	52	\|
128	abate	66	[ op = [ LIDENT "flatten"
129			\| LIDENT "load_xml"
130	abate	188	\| LIDENT "load_html"
131	abate	76	\| LIDENT "print_xml"
132	abate	124	\| LIDENT "print"
133	abate	66	\| LIDENT "raise"
134			\| LIDENT "int_of"
135	abate	133	\| LIDENT "string_of"
136	abate	66	];
137			e = expr -> mk loc (Op (op,[e]))
138	abate	126	\| op = [ LIDENT "dump_to_file" ];
139			e1 = expr LEVEL "no_appl"; e2 = expr -> mk loc (Op (op, [e1;e2]))
140	abate	151	\| e1 = SELF; LIDENT "div"; e2 = expr -> mk loc (Op ("/", [e1;e2]))
141	abate	210	\| e1 = SELF; LIDENT "mod"; e2 = expr -> mk loc (Op ("mod", [e1;e2]))
142	abate	151	\| e1 = SELF; e2 = expr -> mk loc (Apply (e1,e2))
143	abate	52	]
144
145	abate	4	\| "no_appl"
146			[ c = const -> mk loc (Cst c)
147			\| "("; l = LIST1 expr SEP ","; ")" -> tuple loc l
148	abate	18	\| "["; l = LIST0 seq_elem; e = OPT [ ";"; e = expr -> e ]; "]" ->
149			let e = match e with Some e -> e \| None -> cst_nil in
150	abate	89	List.fold_right
151			(fun x q ->
152			match x with
153			\| `Elems l -> tuple_queue l q
154			\| `Explode x -> mk x.loc (Op ("@",[x;q]))
155			) l e
156	abate	81	\| t = [ a = TAG ->
157	abate	222	mk loc (Cst (Types.Atom (Atoms.mk a)))
158	abate	81	\| "<"; e = expr LEVEL "no_appl" -> e ];
159			a = expr_attrib_spec; ">"; c = expr ->
160	abate	110	mk loc (Xml (t, mk loc (Pair (a,c))))
161	abate	4	\| "{"; r = [ expr_record_spec \| -> mk loc (RecordLitt []) ]; "}" -> r
162	abate	81	\| s = STRING2 ->
163	abate	38	tuple loc (char_list loc s @ [cst_nil])
164	abate	4	\| a = LIDENT -> mk loc (Var a)
165			]
166
167			];
168	abate	18
169			seq_elem: [
170	abate	89	[ x = STRING1 -> `Elems (char_list loc x)
171			\| e = expr LEVEL "no_appl" -> `Elems [e]
172			\| "!"; e = expr LEVEL "no_appl" -> `Explode e
173	abate	18	]
174			];
175	abate	4
176			let_binding: [
177			[ "let"; p = pat; "="; e = expr -> (p,e)
178	abate	54	\| "let"; p = pat; ":"; t = pat; "="; e = expr -> (p, mk noloc (Forget (e,t)))
179	abate	48	\| "let"; "fun"; (f,a,b) = fun_decl ->
180			let p = match f with
181			\| Some x -> mk loc (Capture x)
182			\| _ -> failwith "Function name mandatory in let fun declarations"
183			in
184			let abst = { fun_name = f; fun_iface = a; fun_body = b } in
185	abate	4	let e = mk loc (Abstraction abst) in
186	abate	48	(p,e);
187	abate	4	]
188			];
189
190	abate	48	fun_decl: [
191	abate	85	(* need an hack to do this, because both productions would
192			match [ OPT LIDENT; "("; pat ] .... *)
193			[ f = OPT LIDENT; "("; p1 = pat LEVEL "no_arrow";
194			res = [ "->"; p2 = pat;
195			a = [ ";"; a = LIST0 arrow SEP ";" -> a \| -> [] ];
196			")"; b = branches -> `Classic (p2,a,b)
197			\| ":"; targ1 = pat;
198			args = LIST0 [ ","; arg = pat; ":"; targ = pat -> (arg,targ) ];
199			")"; ":"; tres = pat ;
200			"="; body = expr ->
201			`Compact (targ1,args,tres,body)
202			] ->
203			match res with
204			\| `Classic (p2,a,b) -> f,(p1,p2)::a,b
205			\| `Compact (targ1,args,tres,body) ->
206			let args = (p1,targ1) :: args in
207			let targ = multi_prod noloc (List.map snd args) in
208			let arg = multi_prod noloc (List.map fst args) in
209			let b = [arg, body] in
210			let a = [targ,tres] in
211			(f,a,b)
212	abate	48	]
213			];
214
215	abate	85	arrow: [
216	abate	9	[ t1 = pat LEVEL "no_arrow"; "->"; t2 = pat -> (t1,t2)]
217	abate	4	];
218
219			branches: [
220	abate	81	[ OPT "\|"; l = LIST1 branch SEP "\|" -> l ]
221	abate	4	];
222
223			branch: [
224	abate	6	[ p = pat LEVEL "no_arrow"; "->"; e = expr -> (p,e) ]
225	abate	4	];
226
227
228			regexp: [
229			[ x = regexp; "\|"; y = regexp -> Alt (x,y) ]
230			\| [ x = regexp; y = regexp -> Seq (x,y) ]
231			\| [ a = LIDENT; "::"; x = regexp -> SeqCapture (a,x) ]
232			\| [ x = regexp; "*" -> Star x
233			\| x = regexp; "*?" -> WeakStar x
234			\| x = regexp; "+" -> Seq (x, Star x)
235			\| x = regexp; "+?" -> Seq (x, WeakStar x)
236	abate	71	\| x = regexp; "?" -> Alt (x, Epsilon)
237	abate	4	\| x = regexp; "??" -> Alt (Epsilon, x) ]
238			\| [ "("; x = regexp; ")" -> x
239	abate	120	\| "("; a = LIDENT; ":="; c = const; ")" -> Elem (mk loc (Constant (a,c)))
240	abate	66	\| UIDENT "PCDATA" -> string_regexp
241	abate	81	\| i = STRING1; "--"; j = STRING1 ->
242	abate	222	let i = Chars.mk_char (parse_char loc i)
243			and j = Chars.mk_char (parse_char loc j) in
244	abate	66	Elem (mk loc (Internal (Types.char (Chars.char_class i j))))
245	abate	81	\| s = STRING1 ->
246			let s = seq_of_string loc s in
247	abate	18	List.fold_right
248	abate	66	(fun (loc,c) accu ->
249	abate	222	let c = Chars.mk_char c in
250	abate	18	let c = Chars.atom c in
251			Seq (Elem (mk loc (Internal (Types.char c))), accu))
252			s
253	abate	66	Epsilon
254	abate	4	\| e = pat LEVEL "simple" -> Elem e
255			]
256			];
257
258			pat: [
259			[ x = pat; "where";
260			b = LIST1 [ a = UIDENT; "="; y = pat -> (a,y)] SEP "and"
261			-> mk loc (Recurs (x,b)) ]
262			\| RIGHTA [ x = pat; "->"; y = pat -> mk loc (Arrow (x,y)) ]
263	abate	6	\| "no_arrow" [ x = pat; "\|"; y = pat -> mk loc (Or (x,y)) ]
264	abate	121	\| "simple" [ x = pat; "&"; y = pat -> mk loc (And (x,y))
265	abate	99	\| x = pat; "\\"; y = pat -> mk loc (Diff (x,y)) ]
266	abate	4	\|
267	abate	159	[ "{"; r = record_spec; "}" -> mk loc (Record (true,r))
268			\| "{\|"; r = record_spec; "\|}" -> mk loc (Record (false,r))
269	abate	4	\| LIDENT "_" -> mk loc (Internal Types.any)
270			\| a = LIDENT -> mk loc (Capture a)
271			\| "("; a = LIDENT; ":="; c = const; ")" -> mk loc (Constant (a,c))
272			\| a = UIDENT -> mk loc (PatVar a)
273			\| i = INT ; "--"; j = INT ->
274	abate	222	let i = Intervals.mk i
275			and j = Intervals.mk j in
276	abate	52	mk loc (Internal (Types.interval (Intervals.bounded i j)))
277			\| i = INT ->
278	abate	222	let i = Intervals.mk i in
279	abate	52	mk loc (Internal (Types.interval (Intervals.atom i)))
280	abate	81	\| "*"; "--"; j = INT ->
281	abate	222	let j = Intervals.mk j in
282	abate	52	mk loc (Internal (Types.interval (Intervals.left j)))
283	abate	81	\| i = INT; "--"; "*" ->
284	abate	222	let i = Intervals.mk i in
285	abate	52	mk loc (Internal (Types.interval (Intervals.right i)))
286	abate	19	\| i = char ->
287			mk loc (Internal (Types.char (Chars.char_class i i)))
288	abate	13	\| i = char ; "--"; j = char ->
289	abate	18	mk loc (Internal (Types.char (Chars.char_class i j)))
290	abate	4	\| c = const -> mk loc (Internal (Types.constant c))
291			\| "("; l = LIST1 pat SEP ","; ")" -> multi_prod loc l
292			\| "["; r = [ r = regexp -> r \| -> Epsilon ];
293			q = [ ";"; q = pat -> q
294	abate	18	\| -> mk noloc (Internal (Sequence.nil_type)) ];
295	abate	4	"]" -> mk loc (Regexp (r,q))
296	abate	81	\| t = [
297			[ "<"; LIDENT "_" -> mk loc (Internal (Types.atom (Atoms.any)))
298			\| a = TAG ->
299			mk loc
300	abate	222	(Internal (Types.atom (Atoms.atom (Atoms.mk a)))) ]
301	abate	81	\| [ "<"; t = pat -> t ]
302			];
303			a = attrib_spec; ">"; c = pat ->
304	abate	110	mk loc (XmlT (t, multi_prod loc [a;c]))
305	abate	81	\| s = STRING2 ->
306			let s = seq_of_string loc s in
307	abate	63	let s = List.map
308	abate	66	(fun (loc,c) ->
309	abate	63	mk loc (Internal
310			(Types.char
311			(Chars.atom
312	abate	222	(Chars.mk_char c))))) s in
313	abate	63	let s = s @ [mk loc (Internal (Sequence.nil_type))] in
314			multi_prod loc s
315	abate	4	]
316
317			];
318
319			record_spec:
320	abate	81	[ [ r = LIST0 [ l = [LIDENT \| UIDENT]; "=";
321			o = [ "?" -> true \| -> false];
322	abate	159	x = pat -> (Types.LabelPool.mk l,o,x)
323	abate	4	] SEP ";" ->
324	abate	159	(* TODO: check here uniqueness *)
325			List.sort (fun (l1,_,_) (l2,_,_) -> compare l1 l2) r
326	abate	4	] ];
327
328	abate	13	char:
329			[
330	abate	222	[ c = STRING1 -> Chars.mk_char (parse_char loc c)
331			\| "!"; i = INT -> Chars.mk_int (int_of_string i) ]
332	abate	13	];
333
334
335	abate	4	const:
336			[
337	abate	222	[ i = INT -> Types.Integer (Intervals.mk i)
338			\| "`"; a = [LIDENT \| UIDENT] -> Types.Atom (Atoms.mk a)
339	abate	13	\| c = char -> Types.Char c ]
340	abate	4	];
341
342
343			attrib_spec:
344	abate	159	[ [ r = record_spec -> mk loc (Record (true,r))
345			\| "("; t = pat; ")" -> t ] ];
346	abate	4
347			expr_record_spec:
348			[ [ r = LIST1
349	abate	78	[ l = [LIDENT \| UIDENT]; "="; x = expr ->
350			(Types.LabelPool.mk l,x) ]
351	abate	4	SEP ";" ->
352			mk loc (RecordLitt r)
353			] ];
354
355			expr_attrib_spec:
356			[ [ r = expr_record_spec -> r ]
357			\| [ e = expr LEVEL "no_appl" -> e
358			\| -> mk loc (RecordLitt [])
359			]
360			];
361			END
362
363	abate	61	let pat' = Grammar.Entry.create gram "type/pattern expression"
364			EXTEND GLOBAL: pat pat';
365			pat': [ [ p = pat; EOI -> p ] ];
366			END
367
368	abate	10	let pat = Grammar.Entry.parse pat
369	abate	81	and expr = Grammar.Entry.parse expr
370			and prog = Grammar.Entry.parse prog
371	abate	10
372			module From_string = struct
373	abate	61	let pat s = Grammar.Entry.parse pat' (Stream.of_string s)
374	abate	10	let expr s = expr (Stream.of_string s)
375	abate	4	end
376