exception Error of int * int * string
+exception Not_an_extended_ident
+
let regexp alpha = [ 'a' - 'z' 'A' - 'Z' ]
let regexp digit = [ '0' - '9' ]
let regexp blank = [ ' ' '\t' '\n' ]
let regexp blanks = blank+
let regexp num = digit+
-let regexp ident = alpha (alpha | num)*
-let regexp symbol = [^ 'a' - 'z' 'A' - 'Z' '0' - '9' ' ' '\t' '\n' ]
let regexp tex_token = '\\' alpha+
+let regexp symbol = [^ 'a' - 'z' 'A' - 'Z' '0' - '9' ' ' '\t' '\n' ]
+let regexp ident_cont = alpha | num | '_'
+let regexp ident_cont' = ident_cont | tex_token
+let regexp ident = (alpha ident_cont*) | ('_' ident_cont+)
+let regexp ident' = ((alpha | tex_token) ident_cont'*) | ('_' ident_cont'+)
let regexp lparen = [ '(' '[' '{' ]
let regexp rparen = [ ')' ']' '}' ]
let regexp meta = '?' num
+(* let regexp catchall = .* *)
let keywords = Hashtbl.create 17
let _ =
let return lexbuf token = (token, Ulexing.loc lexbuf)
+(*
+let parse_ext_ident ident =
+ let len = String.length ident in
+ let buf = Buffer.create len in
+ let in_tex_token = ref false in
+ let tex_token = Buffer.create 10 in
+ try
+ for i = 0 to len - 1 do
+ match ident.[i] with
+ | '\' when not !in_tex_token ->
+ if i < len - 1 &&
+ in_tex_token := true
+ done
+ with Invalid_argument -> assert false
+
+let rec token' = lexer
+ | ident' ->
+ (try
+ let ident = parse_ext_ident (Ulexing.utf8_lexeme lexbuf) in
+ return lexbuf ("IDENT'", ident)
+ with Not_an_extended_ident ->
+ Ulexing.rollback lexbuf;
+ token lexbuf)
+ | _ ->
+ Ulexing.rollback lexbuf;
+ token lexbuf
+
+and token = lexer
+*)
let rec token = lexer
-| blanks -> token lexbuf
-| ident ->
- let lexeme = Ulexing.utf8_lexeme lexbuf in
- (try
- return lexbuf (Hashtbl.find keywords lexeme)
- with Not_found ->
- return lexbuf ("IDENT", lexeme))
-| num -> return lexbuf ("INT", Ulexing.utf8_lexeme lexbuf)
-| lparen -> return lexbuf ("LPAREN", Ulexing.utf8_lexeme lexbuf)
-| rparen -> return lexbuf ("RPAREN", Ulexing.utf8_lexeme lexbuf)
-| meta -> return lexbuf ("META", Ulexing.utf8_lexeme lexbuf)
-| symbol -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
-| tex_token ->
- let macro =
- Ulexing.utf8_sub_lexeme lexbuf 1 (Ulexing.lexeme_length lexbuf - 1)
- in
- (try
- return lexbuf ("SYMBOL", Macro.expand macro)
- with Macro.Macro_not_found _ ->
- return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf))
-| eof -> return lexbuf ("EOI", "")
-| _ -> error lexbuf "Invalid character"
+ | blanks -> token lexbuf
+ | ident ->
+ let lexeme = Ulexing.utf8_lexeme lexbuf in
+ (try
+ return lexbuf (Hashtbl.find keywords lexeme)
+ with Not_found -> return lexbuf ("IDENT", lexeme))
+ | num -> return lexbuf ("NUM", Ulexing.utf8_lexeme lexbuf)
+ | lparen -> return lexbuf ("LPAREN", Ulexing.utf8_lexeme lexbuf)
+ | rparen -> return lexbuf ("RPAREN", Ulexing.utf8_lexeme lexbuf)
+ | meta -> return lexbuf ("META", Ulexing.utf8_lexeme lexbuf)
+ | symbol -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
+ | tex_token ->
+ let macro =
+ Ulexing.utf8_sub_lexeme lexbuf 1 (Ulexing.lexeme_length lexbuf - 1)
+ in
+ (try
+ return lexbuf ("SYMBOL", Macro.expand macro)
+ with Macro.Macro_not_found _ ->
+ return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf))
+ | eof -> return lexbuf ("EOI", "")
+ | _ -> error lexbuf "Invalid character"
let tok_func stream =
let lexbuf = Ulexing.from_utf8_stream stream in