1 (* Copyright (C) 2005, 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/
28 exception Error of int * int * string
30 let regexp number = xml_digit+
32 let regexp ident_decoration = '\'' | '!' | '?' | '`'
33 let regexp ident_cont = xml_letter | xml_digit | '_'
34 let regexp ident = xml_letter ident_cont* ident_decoration*
36 let regexp tex_token = '\\' ident
38 let regexp delim_begin = "\\["
39 let regexp delim_end = "\\]"
41 let regexp keyword = '"' ident '"'
42 let regexp qkeyword = "'" ident "'"
44 let regexp implicit = '?'
45 let regexp meta = implicit number
47 let regexp csymbol = '\'' ident
49 let regexp begin_group = "@{" | "${"
50 let regexp end_group = '}'
51 let regexp wildcard = "$_"
52 let regexp ast_ident = "@" ident
53 let regexp ast_csymbol = "@" csymbol
54 let regexp meta_ident = "$" ident
55 let regexp meta_anonymous = "$_"
56 let regexp qstring = '"' [^ '"']* '"'
61 "over"; "atop"; "frac";
65 let level2_meta_keywords =
66 [ "if"; "then"; "else";
67 "fold"; "left"; "right"; "rec";
70 "anonymous"; "ident"; "number"; "term"; "fresh"
74 [ "hbox"; "hvbox"; "hovbox"; "vbox";
76 "list0"; "list1"; "sep";
78 "term"; "ident"; "number"
82 ("cic:/" | "theory:/") (* schema *)
83 ident ('/' ident)* (* path *)
84 ('.' ident)+ (* ext *)
85 ("#xpointer(" number ('/' number)+ ")")? (* xpointer *)
87 let error lexbuf msg =
88 let begin_cnum, end_cnum = Ulexing.loc lexbuf in
89 raise (Error (begin_cnum, end_cnum, msg))
90 let error_at_end lexbuf msg =
91 let begin_cnum, end_cnum = Ulexing.loc lexbuf in
92 raise (Error (begin_cnum, end_cnum, msg))
94 let return_with_loc token begin_cnum end_cnum =
95 (* TODO handle line/column numbers *)
97 { Lexing.pos_fname = "";
98 Lexing.pos_lnum = -1; Lexing.pos_bol = -1;
99 Lexing.pos_cnum = begin_cnum }
101 let flocation_end = { flocation_begin with Lexing.pos_cnum = end_cnum } in
102 (token, (flocation_begin, flocation_end))
104 let return lexbuf token =
105 let begin_cnum, end_cnum = Ulexing.loc lexbuf in
106 return_with_loc token begin_cnum end_cnum
108 let return_lexeme lexbuf name = return lexbuf (name, Ulexing.utf8_lexeme lexbuf)
110 let remove_quotes s = String.sub s 1 (String.length s - 2)
113 let tok_func stream =
114 let lexbuf = Ulexing.from_utf8_stream stream in
115 Token.make_stream_and_flocation
120 | Ulexing.Error -> error_at_end lexbuf "Unexpected character"
121 | Ulexing.InvalidCodepoint p ->
122 error_at_end lexbuf (sprintf "Invalid code point: %d" p))
125 Token.tok_func = tok_func;
126 Token.tok_using = (fun _ -> ());
127 Token.tok_removing = (fun _ -> ());
128 Token.tok_match = Token.default_match;
129 Token.tok_text = Token.lexer_text;
130 Token.tok_comm = None;
133 let expand_macro lexbuf =
135 Ulexing.utf8_sub_lexeme lexbuf 1 (Ulexing.lexeme_length lexbuf - 1)
138 ("SYMBOL", Utf8Macro.expand macro)
139 with Utf8Macro.Macro_not_found _ -> "SYMBOL", Ulexing.utf8_lexeme lexbuf
141 let keyword lexbuf = "KEYWORD", remove_quotes (Ulexing.utf8_lexeme lexbuf)
143 let remove_quotes s = String.sub s 1 (String.length s - 2)
144 let remove_left_quote s = String.sub s 1 (String.length s - 1)
146 let rec level2_pattern_token_group counter buffer = lexer
148 if (counter > 0) then
149 Buffer.add_string buffer (Ulexing.utf8_lexeme lexbuf) ;
150 snd (Ulexing.loc lexbuf)
152 Buffer.add_string buffer (Ulexing.utf8_lexeme lexbuf) ;
153 ignore (level2_pattern_token_group (counter + 1) buffer lexbuf) ;
154 level2_pattern_token_group counter buffer lexbuf
156 Buffer.add_string buffer (Ulexing.utf8_lexeme lexbuf) ;
157 level2_pattern_token_group counter buffer lexbuf
159 let read_unparsed_group token_name lexbuf =
160 let buffer = Buffer.create 16 in
161 let begin_cnum, _ = Ulexing.loc lexbuf in
162 let end_cnum = level2_pattern_token_group 0 buffer lexbuf in
163 return_with_loc (token_name, Buffer.contents buffer) begin_cnum end_cnum
165 let rec level2_meta_token = lexer
166 | xml_blank+ -> level2_meta_token lexbuf
168 let s = Ulexing.utf8_lexeme lexbuf in
170 if List.mem s level2_meta_keywords then
171 return lexbuf ("", s)
173 return lexbuf ("IDENT", s)
175 | "@{" -> read_unparsed_group "UNPARSED_AST" lexbuf
176 | ast_ident -> return lexbuf ("UNPARSED_AST", remove_left_quote (Ulexing.utf8_lexeme lexbuf))
177 | ast_csymbol -> return lexbuf ("UNPARSED_AST", remove_left_quote (Ulexing.utf8_lexeme lexbuf))
178 | eof -> return lexbuf ("EOI", "")
180 let rec level2_ast_token = lexer
181 | xml_blank+ -> level2_ast_token lexbuf
182 | meta -> return lexbuf ("META", Ulexing.utf8_lexeme lexbuf)
183 | implicit -> return lexbuf ("IMPLICIT", Ulexing.utf8_lexeme lexbuf)
184 | ident -> return lexbuf ("IDENT", Ulexing.utf8_lexeme lexbuf)
185 | number -> return lexbuf ("NUMBER", Ulexing.utf8_lexeme lexbuf)
186 | keyword -> return lexbuf (keyword lexbuf)
187 | tex_token -> return lexbuf (expand_macro lexbuf)
188 | uri -> return lexbuf ("URI", Ulexing.utf8_lexeme lexbuf)
189 | qstring -> return lexbuf ("QSTRING", remove_quotes (Ulexing.utf8_lexeme lexbuf))
190 | csymbol -> return lexbuf ("CSYMBOL", Ulexing.utf8_lexeme lexbuf)
191 | "${" -> read_unparsed_group "UNPARSED_META" lexbuf
192 | "@{" -> read_unparsed_group "UNPARSED_AST" lexbuf
193 | '(' -> return lexbuf ("LPAREN", "")
194 | ')' -> return lexbuf ("RPAREN", "")
195 | meta_ident -> return lexbuf ("UNPARSED_META", remove_left_quote (Ulexing.utf8_lexeme lexbuf))
196 | meta_anonymous -> return lexbuf ("UNPARSED_META", "anonymous")
197 | _ -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
198 | eof -> return lexbuf ("EOI", "")
200 let rec level1_pattern_token = lexer
201 | xml_blank+ -> level1_pattern_token lexbuf
202 | number -> return lexbuf ("NUMBER", Ulexing.utf8_lexeme lexbuf)
204 let s = Ulexing.utf8_lexeme lexbuf in
206 if List.mem s level1_keywords then
207 return lexbuf ("", s)
209 return lexbuf ("IDENT", s)
211 | tex_token -> return lexbuf (expand_macro lexbuf)
212 | qkeyword -> return lexbuf ("QKEYWORD", remove_quotes (Ulexing.utf8_lexeme lexbuf))
213 | '(' -> return lexbuf ("LPAREN", "")
214 | ')' -> return lexbuf ("RPAREN", "")
215 | eof -> return lexbuf ("EOI", "")
216 | _ -> return lexbuf ("SYMBOL", Ulexing.utf8_lexeme lexbuf)
218 (* API implementation *)
220 let level1_pattern_lexer = mk_lexer level1_pattern_token
221 let level2_ast_lexer = mk_lexer level2_ast_token
222 let level2_meta_lexer = mk_lexer level2_meta_token