1 (* Copyright (C) 2004, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://helm.cs.unibo.it/
26 exception Error of int * int * string
28 exception Not_an_extended_ident
30 let regexp alpha = [ 'a' - 'z' 'A' - 'Z' ]
31 let regexp digit = [ '0' - '9' ]
32 let regexp blank = [ ' ' '\t' '\n' ]
33 let regexp paren = [ '(' '[' '{' ')' ']' '}' ]
34 let regexp implicit = '?'
35 let regexp placeholder = '%'
36 let regexp symbol_char =
37 [^ 'a' - 'z' 'A' - 'Z' '0' - '9'
39 '\\' '(' '[' '{' ')' ']' '}' '?'
41 let regexp dust = "%%" [^ '\n']* '\n'
43 let regexp comment_char = [^ ")" ]
44 let regexp note = "(*" comment_char* "*)"
46 let regexp commentbegin = "(**"
47 let regexp commentend = "**)"
49 let regexp blanks = blank+
50 let regexp num = digit+
51 let regexp tex_token = '\\' alpha+
52 let regexp symbol = symbol_char+
53 let regexp ident_cont = alpha | num | '_' | '\''
54 let regexp ident_cont' = ident_cont | tex_token
55 let regexp ident = (alpha ident_cont*) | ('_' ident_cont+)
56 let regexp ident' = ((alpha | tex_token) ident_cont'*) | ('_' ident_cont'+)
57 let regexp meta = implicit num
58 let regexp qstring = '"' [^ '"']* '"'
60 ("cic:/" | "theory:/") (* schema *)
61 ident ('/' ident)* (* path *)
62 ('.' ident)+ (* ext *)
63 ("#xpointer(" num ('/' num)+ ")")? (* xpointer *)
64 (* let regexp catchall = .* *)
66 let keywords = Hashtbl.create 17
68 List.iter (fun keyword -> Hashtbl.add keywords keyword ("", keyword))
69 [ "Prop"; "Type"; "Set"; "let"; "Let"; "rec"; "using"; "match"; "with";
72 let error lexbuf msg =
73 raise (Error (Ulexing.lexeme_start lexbuf, Ulexing.lexeme_end lexbuf, msg))
74 let error_at_end lexbuf msg =
75 raise (Error (Ulexing.lexeme_end lexbuf, Ulexing.lexeme_end lexbuf, msg))
77 let return lexbuf token =
79 { Lexing.pos_fname = ""; Lexing.pos_lnum = -1; Lexing.pos_bol = -1;
80 Lexing.pos_cnum = Ulexing.lexeme_start lexbuf }
83 { flocation_begin with Lexing.pos_cnum = Ulexing.lexeme_end lexbuf }
85 (token, (flocation_begin, flocation_end))
88 let parse_ext_ident ident =
89 let len = String.length ident in
90 let buf = Buffer.create len in
91 let in_tex_token = ref false in
92 let tex_token = Buffer.create 10 in
94 for i = 0 to len - 1 do
96 | '\' when not !in_tex_token ->
100 with Invalid_argument -> assert false
102 let rec token' = lexer
105 let ident = parse_ext_ident (Ulexing.utf8_lexeme lexbuf) in
106 return lexbuf ("IDENT'", ident)
107 with Not_an_extended_ident ->
108 Ulexing.rollback lexbuf;
111 Ulexing.rollback lexbuf;
117 let remove_quotes s = String.sub s 1 (String.length s - 2)
119 let rec token comments = lexer
120 | blanks -> token comments lexbuf
121 | uri -> return lexbuf ("URI", Ulexing.utf8_lexeme lexbuf)
123 let lexeme = Ulexing.utf8_lexeme lexbuf in
125 return lexbuf (Hashtbl.find keywords lexeme)
126 with Not_found -> return lexbuf ("IDENT", lexeme))
127 | num -> return lexbuf ("NUM", Ulexing.utf8_lexeme lexbuf)
128 | paren -> return lexbuf ("PAREN", Ulexing.utf8_lexeme lexbuf)
129 | meta -> return lexbuf ("META", Ulexing.utf8_lexeme lexbuf)
130 | implicit -> return lexbuf ("IMPLICIT", Ulexing.utf8_lexeme lexbuf)
131 | placeholder -> return lexbuf ("PLACEHOLDER", Ulexing.utf8_lexeme lexbuf)
133 return lexbuf ("QSTRING", remove_quotes (Ulexing.utf8_lexeme lexbuf))
134 | symbol -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
137 Ulexing.utf8_sub_lexeme lexbuf 1 (Ulexing.lexeme_length lexbuf - 1)
140 return lexbuf ("SYMBOL", Utf8Macro.expand macro)
141 with Utf8Macro.Macro_not_found _ ->
142 return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf))
143 | dust -> token comments lexbuf
147 Ulexing.utf8_sub_lexeme lexbuf 2 (Ulexing.lexeme_length lexbuf - 2)
149 return lexbuf ("NOTE", comment)
151 token comments lexbuf*)
152 | commentbegin -> return lexbuf ("BEGINCOMMENT","")
153 | commentend -> return lexbuf ("ENDCOMMENT","")
154 | eof -> return lexbuf ("EOI", "")
155 | _ -> error lexbuf "Invalid character"
157 let tok_func comments stream =
158 let lexbuf = Ulexing.from_utf8_stream stream in
159 Token.make_stream_and_flocation
162 token comments lexbuf
164 | Ulexing.Error -> error_at_end lexbuf "Unexpected character"
165 | Ulexing.InvalidCodepoint i -> error_at_end lexbuf "Invalid code point")
167 let cic_lexer ?(comments = false) () =
169 Token.tok_func = tok_func comments;
170 Token.tok_using = (fun _ -> ());
171 Token.tok_removing = (fun _ -> ());
172 Token.tok_match = Token.default_match;
173 Token.tok_text = Token.lexer_text;
174 Token.tok_comm = None;