2 exception Error of int * int * string
4 let regexp alpha = [ 'a' - 'z' 'A' - 'Z' ]
5 let regexp digit = [ '0' - '9' ]
6 let regexp blank = [ ' ' '\t' '\n' ]
8 let regexp blanks = blank+
9 let regexp num = digit+
10 let regexp ident = alpha (alpha | num)*
11 let regexp symbol = [^ 'a' - 'z' 'A' - 'Z' '0' - '9' ' ' '\t' '\n' ]
12 let regexp tex_token = '\\' alpha+
13 let regexp lparen = [ '(' '[' '{' ]
14 let regexp rparen = [ ')' ']' '}' ]
15 let regexp meta = '?' (alpha | num)+
17 let keywords = Hashtbl.create 17
19 List.iter (fun keyword -> Hashtbl.add keywords keyword ("", keyword))
20 [ "Prop"; "Type"; "Set"; "let"; "rec"; "using"; "match"; "with" ]
22 let error lexbuf msg =
23 raise (Error (Ulexing.lexeme_start lexbuf, Ulexing.lexeme_end lexbuf, msg))
24 let error_at_end lexbuf msg =
25 raise (Error (Ulexing.lexeme_end lexbuf, Ulexing.lexeme_end lexbuf, msg))
27 let return lexbuf token = (token, Ulexing.loc lexbuf)
30 | blanks -> token lexbuf
32 let lexeme = Ulexing.utf8_lexeme lexbuf in
34 return lexbuf (Hashtbl.find keywords lexeme)
36 return lexbuf ("IDENT", lexeme))
37 | num -> return lexbuf ("INT", Ulexing.utf8_lexeme lexbuf)
38 | lparen -> return lexbuf ("LPAREN", Ulexing.utf8_lexeme lexbuf)
39 | rparen -> return lexbuf ("RPAREN", Ulexing.utf8_lexeme lexbuf)
40 | meta -> return lexbuf ("META", Ulexing.utf8_lexeme lexbuf)
41 | symbol -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
44 Ulexing.utf8_sub_lexeme lexbuf 1 (Ulexing.lexeme_length lexbuf - 1)
47 return lexbuf ("SYMBOL", Macro.expand macro)
48 with Macro.Macro_not_found _ ->
49 return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf))
50 | eof -> return lexbuf ("EOI", "")
51 | _ -> error lexbuf "Invalid character"
54 let lexbuf = Ulexing.from_utf8_stream stream in
55 Token.make_stream_and_location
60 | Ulexing.Error -> error_at_end lexbuf "Unexpected character"
61 | Ulexing.InvalidCodepoint i -> error_at_end lexbuf "Invalid code point")
65 Token.tok_func = tok_func;
66 Token.tok_using = (fun _ -> ());
67 Token.tok_removing = (fun _ -> ());
68 Token.tok_match = Token.default_match;
69 Token.tok_text = Token.lexer_text;
70 Token.tok_comm = None;