+++ /dev/null
-(* Copyright (C) 2005, HELM Team.
- *
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- *
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA 02111-1307, USA.
- *
- * For details, see the HELM World-Wide-Web page,
- * http://helm.cs.unibo.it/
- *)
-
-open Printf
-
-exception Error of int * int * string
-
-let regexp number = xml_digit+
-
- (* 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 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 +| *)
- uri_step ('/' uri_step)* (* path *)
- ('.' ident)+ (* ext *)
- ("#xpointer(" number ('/' number)+ ")")? (* xpointer *)
-
-let error lexbuf msg =
- let begin_cnum, end_cnum = Ulexing.loc lexbuf in
- raise (Error (begin_cnum, end_cnum, msg))
-let error_at_end lexbuf msg =
- let begin_cnum, end_cnum = Ulexing.loc lexbuf in
- raise (Error (begin_cnum, end_cnum, msg))
-
-let return_with_loc token begin_cnum end_cnum =
- (* TODO handle line/column numbers *)
- let flocation_begin =
- { Lexing.pos_fname = "";
- Lexing.pos_lnum = -1; Lexing.pos_bol = -1;
- Lexing.pos_cnum = begin_cnum }
- in
- 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 *)
-(** 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
- token lexbuf
- with
- | Ulexing.Error -> error_at_end lexbuf "Unexpected character"
- | Ulexing.InvalidCodepoint p ->
- error_at_end lexbuf (sprintf "Invalid code point: %d" p))
- in
- {
- Token.tok_func = tok_func;
- Token.tok_using = (fun _ -> ());
- Token.tok_removing = (fun _ -> ());
- Token.tok_match = Token.default_match;
- Token.tok_text = Token.lexer_text;
- Token.tok_comm = None;
- }
-
-let expand_macro lexbuf =
- let macro =
- Ulexing.utf8_sub_lexeme lexbuf 1 (Ulexing.lexeme_length lexbuf - 1)
- in
- try
- ("SYMBOL", Utf8Macro.expand macro)
- with Utf8Macro.Macro_not_found _ -> "SYMBOL", 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)
-
-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 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
-
-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 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", "")
- | 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)
- | tex_token -> return lexbuf (expand_macro lexbuf)
- | uri -> return lexbuf ("URI", 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 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 -> []
-
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