X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_notation%2FcicNotationLexer.ml;h=33fb8fd78494085a819c9d65fb11e2020a654c42;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=9721ee80503e22af6e4499a334ed6e8cf312784a;hpb=5a40de00f69847c247100b0bde4569cb4003e316;p=helm.git

diff --git a/helm/ocaml/cic_notation/cicNotationLexer.ml b/helm/ocaml/cic_notation/cicNotationLexer.ml
index 9721ee805..33fb8fd78 100644
--- a/helm/ocaml/cic_notation/cicNotationLexer.ml
+++ b/helm/ocaml/cic_notation/cicNotationLexer.ml
@@ -29,20 +29,106 @@ exception Error of int * int * string
 
 let regexp number = xml_digit+
 
-let regexp ident_decoration = '\'' | '!' | '?' | '`'
-let regexp ident_cont = xml_letter | xml_digit | '_'
-let regexp ident = xml_letter ident_cont* ident_decoration*
+  (* ZACK: breaks unicode's binder followed by an ascii letter without blank *)
+(* let regexp ident_letter = xml_letter *)
+
+let regexp ident_letter = [ 'a' - 'z' 'A' - 'Z' ]
+
+  (* must be in sync with "is_ligature_char" below *)
+let regexp ligature_char = [ "'`~!?@*()[]<>-+=|:;.,/\"" ]
+let regexp ligature = ligature_char ligature_char+
+
+let is_ligature_char =
+  (* must be in sync with "regexp ligature_char" above *)
+  let chars = "'`~!?@*()[]<>-+=|:;.,/\"" in
+  (fun char ->
+    (try
+      ignore (String.index chars char);
+      true
+    with Not_found -> false))
+
+let regexp ident_decoration = '\'' | '?' | '`'
+let regexp ident_cont = ident_letter | xml_digit | '_'
+let regexp ident = ident_letter ident_cont* ident_decoration*
 
 let regexp tex_token = '\\' ident
 
-let regexp keyword = '"' ident '"'
+let regexp delim_begin = "\\["
+let regexp delim_end = "\\]"
+
+let regexp qkeyword = "'" ident "'"
 
 let regexp implicit = '?'
+let regexp placeholder = '%'
 let regexp meta = implicit number
 
+let regexp csymbol = '\'' ident
+
+let regexp begin_group = "@{" | "${"
+let regexp end_group = '}'
+let regexp wildcard = "$_"
+let regexp ast_ident = "@" ident
+let regexp ast_csymbol = "@" csymbol
+let regexp meta_ident = "$" ident
+let regexp meta_anonymous = "$_"
+let regexp qstring = '"' [^ '"']* '"'
+
+let regexp begincomment = "(**" xml_blank
+let regexp beginnote = "(*"
+let regexp endcomment = "*)"
+(* let regexp comment_char = [^'*'] | '*'[^')']
+let regexp note = "|+" ([^'*'] | "**") comment_char* "+|" *)
+
+let level1_layouts = 
+  [ "sub"; "sup";
+    "below"; "above";
+    "over"; "atop"; "frac";
+    "sqrt"; "root"
+  ]
+
+let level1_keywords =
+  [ "hbox"; "hvbox"; "hovbox"; "vbox";
+    "break";
+    "list0"; "list1"; "sep";
+    "opt";
+    "term"; "ident"; "number"
+  ] @ level1_layouts
+
+let level2_meta_keywords =
+  [ "if"; "then"; "else";
+    "fold"; "left"; "right"; "rec";
+    "fail";
+    "default";
+    "anonymous"; "ident"; "number"; "term"; "fresh"
+  ]
+
+  (* (string, unit) Hashtbl.t, to exploit multiple bindings *)
+let level2_ast_keywords = Hashtbl.create 23
+let _ =
+  List.iter (fun k -> Hashtbl.add level2_ast_keywords k ())
+  [ "CProp"; "Prop"; "Type"; "Set"; "let"; "rec"; "corec"; "match";
+    "with"; "in"; "and"; "to"; "as"; "on"; "return" ]
+
+let add_level2_ast_keyword k = Hashtbl.add level2_ast_keywords k ()
+let remove_level2_ast_keyword k = Hashtbl.remove level2_ast_keywords k
+
+  (* (string, int) Hashtbl.t, with multiple bindings.
+   * int is the unicode codepoint *)
+let ligatures = Hashtbl.create 23
+let _ =
+  List.iter
+    (fun (ligature, symbol) -> Hashtbl.add ligatures ligature symbol)
+    [ ("->", <:unicode<to>>);   ("=>", <:unicode<Rightarrow>>);
+      ("<=", <:unicode<leq>>);  (">=", <:unicode<geq>>);
+      ("<>", <:unicode<neq>>);  (":=", <:unicode<def>>);
+    ]
+
+let regexp uri_step = [ 'a' - 'z' 'A' - 'Z' '0' - '9' '_' '-' ]+
+
 let regexp uri =
   ("cic:/" | "theory:/")              (* schema *)
-  ident ('/' ident)*                  (* path *)
+(*   ident ('/' ident)*                  |+ path +| *)
+  uri_step ('/' uri_step)*            (* path *)
   ('.' ident)+                        (* ext *)
   ("#xpointer(" number ('/' number)+ ")")?  (* xpointer *)
 
@@ -53,8 +139,7 @@ let error_at_end lexbuf msg =
   let begin_cnum, end_cnum = Ulexing.loc lexbuf in
   raise (Error (begin_cnum, end_cnum, msg))
 
-let return lexbuf token =
-  let begin_cnum, end_cnum = Ulexing.loc lexbuf in
+let return_with_loc token begin_cnum end_cnum =
   (* TODO handle line/column numbers *)
   let flocation_begin =
     { Lexing.pos_fname = "";
@@ -64,11 +149,32 @@ let return lexbuf token =
   let flocation_end = { flocation_begin with Lexing.pos_cnum = end_cnum } in
   (token, (flocation_begin, flocation_end))
 
+let return lexbuf token =
+  let begin_cnum, end_cnum = Ulexing.loc lexbuf in
+    return_with_loc token begin_cnum end_cnum
+
+let return_lexeme lexbuf name = return lexbuf (name, Ulexing.utf8_lexeme lexbuf)
+
+let return_symbol lexbuf s = return lexbuf ("SYMBOL", s)
+let return_eoi lexbuf = return lexbuf ("EOI", "")
+
 let remove_quotes s = String.sub s 1 (String.length s - 2)
 
 let mk_lexer token =
   let tok_func stream =
-    let lexbuf = Ulexing.from_utf8_stream stream in
+(*     let lexbuf = Ulexing.from_utf8_stream stream in *)
+(** XXX Obj.magic rationale.
+ * The problem.
+ *  camlp4 constraints the tok_func field of Token.glexer to have type:
+ *    Stream.t char -> (Stream.t 'te * flocation_function)
+ *  In order to use ulex we have (in theory) to instantiate a new lexbuf each
+ *  time a char Stream.t is passed, destroying the previous lexbuf which may
+ *  have consumed a character from the old stream which is lost forever :-(
+ * The "solution".
+ *  Instead of passing to camlp4 a char Stream.t we pass a lexbuf, casting it to
+ *  char Stream.t with Obj.magic where needed.
+ *)
+    let lexbuf = Obj.magic stream in
     Token.make_stream_and_flocation
       (fun () ->
         try
@@ -95,35 +201,151 @@ let expand_macro lexbuf =
     ("SYMBOL", Utf8Macro.expand macro)
   with Utf8Macro.Macro_not_found _ -> "SYMBOL", Ulexing.utf8_lexeme lexbuf
 
-let keyword lexbuf = "KEYWORD", remove_quotes (Ulexing.utf8_lexeme lexbuf)
+let remove_quotes s = String.sub s 1 (String.length s - 2)
+let remove_left_quote s = String.sub s 1 (String.length s - 1)
 
-(** {2 Level 1 lexer} *)
+let rec level2_pattern_token_group counter buffer =
+  lexer
+  | end_group -> 
+      if (counter > 0) then
+	Buffer.add_string buffer (Ulexing.utf8_lexeme lexbuf) ;
+      snd (Ulexing.loc lexbuf)
+  | begin_group -> 
+      Buffer.add_string buffer (Ulexing.utf8_lexeme lexbuf) ;
+      ignore (level2_pattern_token_group (counter + 1) buffer lexbuf) ;
+      level2_pattern_token_group counter buffer lexbuf
+  | _ -> 
+      Buffer.add_string buffer (Ulexing.utf8_lexeme lexbuf) ;
+      level2_pattern_token_group counter buffer lexbuf
 
-let rec level1_token = lexer
-  | xml_blank+ -> level1_token lexbuf
-  | ident -> return lexbuf ("IDENT", Ulexing.utf8_lexeme lexbuf)
-  | number -> return lexbuf ("NUMBER", Ulexing.utf8_lexeme lexbuf)
-  | keyword -> return lexbuf (keyword lexbuf)
-  | tex_token -> return lexbuf (expand_macro lexbuf)
-  | eof -> return lexbuf ("EOI", "")
-  | _ -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
+let read_unparsed_group token_name lexbuf =
+  let buffer = Buffer.create 16 in
+  let begin_cnum, _ = Ulexing.loc lexbuf in
+  let end_cnum = level2_pattern_token_group 0 buffer lexbuf in
+    return_with_loc (token_name, Buffer.contents buffer) begin_cnum end_cnum
 
-(** {2 Level 2 lexer} *)
+let rec level2_meta_token =
+  lexer
+  | xml_blank+ -> level2_meta_token lexbuf
+  | ident ->
+      let s = Ulexing.utf8_lexeme lexbuf in
+	begin
+	  if List.mem s level2_meta_keywords then
+	    return lexbuf ("", s)
+	  else
+	    return lexbuf ("IDENT", s)
+	end
+  | "@{" -> read_unparsed_group "UNPARSED_AST" lexbuf
+  | ast_ident ->
+      return lexbuf ("UNPARSED_AST",
+        remove_left_quote (Ulexing.utf8_lexeme lexbuf))
+  | ast_csymbol ->
+      return lexbuf ("UNPARSED_AST",
+        remove_left_quote (Ulexing.utf8_lexeme lexbuf))
+  | eof -> return_eoi lexbuf
 
-let rec level2_token = lexer
-  | xml_blank+ -> level2_token lexbuf
+let rec comment_token acc depth =
+  lexer
+  | beginnote ->
+      let acc = acc ^ Ulexing.utf8_lexeme lexbuf in
+      comment_token acc (depth + 1) lexbuf
+  | endcomment ->
+      let acc = acc ^ Ulexing.utf8_lexeme lexbuf in
+      if depth = 0
+      then acc
+      else comment_token acc (depth - 1) lexbuf
+  | _ ->
+      let acc = acc ^ Ulexing.utf8_lexeme lexbuf in
+      comment_token acc depth lexbuf
+
+  (** @param k continuation to be invoked when no ligature has been found *)
+let rec ligatures_token k =
+  lexer
+  | ligature ->
+      let lexeme = Ulexing.utf8_lexeme lexbuf in
+      (match List.rev (Hashtbl.find_all ligatures lexeme) with
+      | [] -> (* ligature not found, rollback and try default lexer *)
+          Ulexing.rollback lexbuf;
+          k lexbuf
+      | default_lig :: _ -> (* ligatures found, use the default one *)
+          return_symbol lexbuf default_lig)
+  | eof -> return_eoi lexbuf
+  | _ ->  (* not a ligature, rollback and try default lexer *)
+      Ulexing.rollback lexbuf;
+      k lexbuf
+
+and level2_ast_token =
+  lexer
+  | xml_blank+ -> ligatures_token level2_ast_token lexbuf
   | meta -> return lexbuf ("META", Ulexing.utf8_lexeme lexbuf)
-  | implicit -> return lexbuf ("IMPLICIT", Ulexing.utf8_lexeme lexbuf)
-  | ident -> return lexbuf ("IDENT", Ulexing.utf8_lexeme lexbuf)
+  | implicit -> return lexbuf ("IMPLICIT", "")
+  | placeholder -> return lexbuf ("PLACEHOLDER", "")
+  | ident ->
+      let lexeme = Ulexing.utf8_lexeme lexbuf in
+      if Hashtbl.mem level2_ast_keywords lexeme then
+        return lexbuf ("", lexeme)
+      else
+        return lexbuf ("IDENT", lexeme)
   | number -> return lexbuf ("NUMBER", Ulexing.utf8_lexeme lexbuf)
-  | keyword -> return lexbuf (keyword lexbuf)
   | tex_token -> return lexbuf (expand_macro lexbuf)
   | uri -> return lexbuf ("URI", Ulexing.utf8_lexeme lexbuf)
-  | eof -> return lexbuf ("EOI", "")
-  | _ -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
+  | qstring ->
+      return lexbuf ("QSTRING", remove_quotes (Ulexing.utf8_lexeme lexbuf))
+  | csymbol ->
+      return lexbuf ("CSYMBOL", remove_left_quote (Ulexing.utf8_lexeme lexbuf))
+  | "${" -> read_unparsed_group "UNPARSED_META" lexbuf
+  | "@{" -> read_unparsed_group "UNPARSED_AST" lexbuf
+  | '(' -> return lexbuf ("LPAREN", "")
+  | ')' -> return lexbuf ("RPAREN", "")
+  | meta_ident ->
+      return lexbuf ("UNPARSED_META",
+        remove_left_quote (Ulexing.utf8_lexeme lexbuf))
+  | meta_anonymous -> return lexbuf ("UNPARSED_META", "anonymous")
+  | beginnote -> 
+      let comment = comment_token (Ulexing.utf8_lexeme lexbuf) 0 lexbuf in
+(*       let comment =
+        Ulexing.utf8_sub_lexeme lexbuf 2 (Ulexing.lexeme_length lexbuf - 4)
+      in
+      return lexbuf ("NOTE", comment) *)
+      ligatures_token level2_ast_token lexbuf
+  | begincomment -> return lexbuf ("BEGINCOMMENT","")
+  | endcomment -> return lexbuf ("ENDCOMMENT","")
+  | eof -> return_eoi lexbuf
+  | _ -> return_symbol lexbuf (Ulexing.utf8_lexeme lexbuf)
+
+and level1_pattern_token =
+  lexer
+  | xml_blank+ -> ligatures_token level1_pattern_token lexbuf
+  | number -> return lexbuf ("NUMBER", Ulexing.utf8_lexeme lexbuf)
+  | ident ->
+      let s = Ulexing.utf8_lexeme lexbuf in
+	begin
+	  if List.mem s level1_keywords then
+	    return lexbuf ("", s)
+	  else
+	    return lexbuf ("IDENT", s)
+	end
+  | tex_token -> return lexbuf (expand_macro lexbuf)
+  | qkeyword ->
+      return lexbuf ("QKEYWORD", remove_quotes (Ulexing.utf8_lexeme lexbuf))
+  | '(' -> return lexbuf ("LPAREN", "")
+  | ')' -> return lexbuf ("RPAREN", "")
+  | eof -> return_eoi lexbuf
+  | _ -> return_symbol lexbuf (Ulexing.utf8_lexeme lexbuf)
+
+let level1_pattern_token = ligatures_token level1_pattern_token
+let level2_ast_token = ligatures_token level2_ast_token
 
 (* API implementation *)
 
-let syntax_pattern_lexer = mk_lexer level1_token
-let ast_pattern_lexer = mk_lexer level2_token
+let level1_pattern_lexer = mk_lexer level1_pattern_token
+let level2_ast_lexer = mk_lexer level2_ast_token
+let level2_meta_lexer = mk_lexer level2_meta_token
+
+let lookup_ligatures lexeme =
+  try
+    if lexeme.[0] = '\\'
+    then [ Utf8Macro.expand (String.sub lexeme 1 (String.length lexeme - 1)) ]
+    else List.rev (Hashtbl.find_all ligatures lexeme)
+  with Invalid_argument _ | Utf8Macro.Macro_not_found _ as exn -> []