1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- Note: this package uses the generic subprograms in System.Wch_Cnv, which
35 -- completely encapsulate the set of wide character encoding methods, so no
36 -- modifications are required when adding new encoding methods.
40 with System.WCh_Cnv; use System.WCh_Cnv;
41 with System.WCh_Con; use System.WCh_Con;
43 package body Widechar is
45 ---------------------------
46 -- Is_Start_Of_Wide_Char --
47 ---------------------------
49 function Is_Start_Of_Wide_Char
50 (S : Source_Buffer_Ptr;
55 case Wide_Character_Encoding_Method is
57 return S (P) = ASCII.ESC;
63 return S (P) >= Character'Val (16#80#);
66 return P <= S'Last - 2
68 and then S (P + 1) = '"'
69 and then S (P + 2) /= '"';
71 end Is_Start_Of_Wide_Char;
77 function Length_Wide return Nat is
79 return WC_Longest_Sequence;
87 (S : Source_Buffer_Ptr;
88 P : in out Source_Ptr;
92 function In_Char return Character;
93 -- Function to obtain characters of wide character escape sequence
95 function In_Char return Character is
101 function WC_In is new Char_Sequence_To_Wide_Char (In_Char);
104 C := Char_Code (Wide_Character'Pos
105 (WC_In (In_Char, Wide_Character_Encoding_Method)));
109 when Constraint_Error =>
124 procedure Out_Char (C : Character);
125 -- Procedure to store one character of wide character sequence
127 procedure Out_Char (C : Character) is
133 procedure WC_Out is new Wide_Char_To_Char_Sequence (Out_Char);
136 WC_Out (Wide_Character'Val (C), Wide_Character_Encoding_Method);
143 procedure Skip_Wide (S : String; P : in out Natural) is
144 function Skip_Char return Character;
145 -- Function to skip one character of wide character escape sequence
147 function Skip_Char return Character is
153 function WC_Skip is new Char_Sequence_To_Wide_Char (Skip_Char);
155 Discard : Wide_Character;
156 pragma Warnings (Off, Discard);
159 Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);