viewcvs.cgi/parser/parser.ml

open Location
open Ast
open Ident

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

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 = Encodings.Utf8.mk_latin1

let id_dummy = ident (U.mk "$$$")
let atom s = Atoms.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 (Types.Atom Sequence.nil_atom)
                 
let seq_of_string pos s =
  let s =  Encodings.Utf8.mk s in
  let (pos,_) = pos in
  let rec aux pos i j =
    if Encodings.Utf8.equal_index i j then []
    else
      let (len,i) = Encodings.Utf8.next s i in
      let (c,i) = Encodings.Utf8.next s i in
      ((pos,pos+len),c) :: (aux (pos + len) i j)
  in
  aux (pos+1) (Encodings.Utf8.start_index s) (Encodings.Utf8.end_index s)

let get_string s =
  let s = Encodings.Utf8.mk s in
  let b = Buffer.create 32 in
  let rec aux i j =
    if Encodings.Utf8.equal_index i j then ()
    else
      let (len,i) = Encodings.Utf8.next s i in
      let (c,i) = Encodings.Utf8.next s i in
      Encodings.Utf8.store b c;
      aux i j
  in
  aux (Encodings.Utf8.start_index s) (Encodings.Utf8.end_index s);
  Buffer.contents b

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

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

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

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


let include_stack = ref []

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

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 ]
  ];

  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"
    | "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 = get_string s in
        protect_op "File inclusion";
        (* avoid looping; should issue an error ? *)
        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
               let input = Stream.of_channel chan in
               let l = Grammar.Entry.parse prog input in
               close_in chan;
               l)
            (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"
        ]
        -> 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))
    | "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
                       | `Elems l -> tuple_queue l q
                       | `Explode x -> Op ("@",[x;q])
                  ) l e
        in
        exp loc l
    | "<"; t = [ "("; e = expr; ")" -> e
               | a = [ LIDENT | UIDENT | keyword ] -> 
                   exp loc (Cst (Types.Atom (atom a))) ];
        a = expr_attrib_spec; ">"; c = expr ->
        exp loc (Xml (t, Pair (a,c)))
    | "{"; r = [ expr_record_spec | -> exp loc (RecordLitt LabelMap.empty) ]; "}" -> r
    | s = STRING2 ->
        exp loc (tuple (char_list loc s @ [cst_nil]))
    | a = LIDENT -> exp loc (Var (ident 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 -> (false,p,e)
    | "let"; p = pat; ":"; t = pat; "="; e = expr -> (false,p, 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 = exp loc (Abstraction abst) in
        (true,p,e)
    ] 
  ];

 fun_decl: [
(* need an hack to do this, because both productions would
   match   [ OPT LIDENT; "("; pat ] .... *)
   [ f = OPT [ x = LIDENT -> ident x]; "("; 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 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
            (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 ->
        let s = seq_of_string loc s in
        List.fold_right
          (fun (loc,c) accu -> 
             let c = Chars.mk_int 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; 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))
      | 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 
                 | -> mknoloc (Internal (Sequence.nil_type)) ]; 
             "]" -> mk loc (Regexp (r,q))
      | "<"; t =
        [ x = [ LIDENT | UIDENT | keyword ] ->
            let a = if x = "_" then Atoms.any else Atoms.atom (atom x) in
            mk loc (Internal (Types.atom 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_int c))))) s in
          let s = s @ [mk loc (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 -> Types.Integer (Intervals.mk i)
      | "`"; a = [LIDENT | UIDENT | keyword ] -> Types.Atom (atom a)
      | c = char -> 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.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
and top_phrases = Grammar.Entry.parse top_phrases

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