1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
11 -- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 -- Note: this package uses the generic subprograms in System.Wch_Cnv, which
37 -- completely encapsulate the set of wide character encoding methods, so no
38 -- modifications are required when adding new encoding methods.
42 with System.WCh_Cnv; use System.WCh_Cnv;
43 with System.WCh_Con; use System.WCh_Con;
45 package body Widechar is
47 ---------------------------
48 -- Is_Start_Of_Wide_Char --
49 ---------------------------
51 function Is_Start_Of_Wide_Char
52 (S : Source_Buffer_Ptr;
57 case Wide_Character_Encoding_Method is
59 return S (P) = ASCII.ESC;
65 return S (P) >= Character'Val (16#80#);
68 return P <= S'Last - 2
70 and then S (P + 1) = '"'
71 and then S (P + 2) /= '"';
73 end Is_Start_Of_Wide_Char;
79 function Length_Wide return Nat is
81 return WC_Longest_Sequence;
89 (S : Source_Buffer_Ptr;
90 P : in out Source_Ptr;
94 function In_Char return Character;
95 -- Function to obtain characters of wide character escape sequence
97 function In_Char return Character is
103 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
106 C := Char_Code (Wide_Character'Pos
107 (WC_In (In_Char, Wide_Character_Encoding_Method)));
111 when Constraint_Error =>
126 procedure Out_Char (C : Character);
127 -- Procedure to store one character of wide character sequence
129 procedure Out_Char (C : Character) is
135 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
138 WC_Out (Wide_Character'Val (C), Wide_Character_Encoding_Method);
145 procedure Skip_Wide (S : String; P : in out Natural) is
146 function Skip_Char return Character;
147 -- Function to skip one character of wide character escape sequence
149 function Skip_Char return Character is
155 function WC_Skip is new Char_Sequence_To_Wide_Char (Skip_Char);
157 Discard : Wide_Character;
160 Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);