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.Unichar.from_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)
    ]
  ];

  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 "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; 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 (Types.AtomPool.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.Unichar.from_char (parse_char loc i)
        and j = Chars.Unichar.from_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.Unichar.from_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; "}" -> 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 = Big_int.big_int_of_string i 
          and j = Big_int.big_int_of_string j in
          mk loc (Internal (Types.interval (Intervals.bounded i j)))
      | i = INT -> 
          let i = Big_int.big_int_of_string i  in
          mk loc (Internal (Types.interval (Intervals.atom i)))
      | "*"; "--"; j = INT ->
          let j = Big_int.big_int_of_string j in
          mk loc (Internal (Types.interval (Intervals.left j)))
      | i = INT; "--"; "*" ->
          let i = Big_int.big_int_of_string 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 (Types.AtomPool.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.Unichar.from_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 ->
                    mk loc (Record (Types.LabelPool.mk l,o,x))
                ] SEP ";" ->
        match r with
          | [] -> mk loc (Internal Types.Record.any)
          | h::t -> List.fold_left (fun t1 t2 -> mk loc (And (t1,t2))) h t
      ] ];
  
  char:
    [ 
      [ c = STRING1 -> Chars.Unichar.from_char (parse_char loc c)
      | "!"; i = INT -> Chars.Unichar.from_int (int_of_string i) ]
    ];
     

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


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