1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2005, 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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;
51 P : Source_Ptr) return Boolean
54 case Wide_Character_Encoding_Method is
56 return S (P) = ASCII.ESC;
62 return S (P) >= Character'Val (16#80#);
65 return P <= S'Last - 2
67 and then S (P + 1) = '"'
68 and then S (P + 2) /= '"';
70 end Is_Start_Of_Wide_Char;
76 function Length_Wide return Nat is
78 return WC_Longest_Sequence;
86 (S : Source_Buffer_Ptr;
87 P : in out Source_Ptr;
91 P_Init : constant Source_Ptr := P;
93 function In_Char return Character;
94 -- Function to obtain characters of wide character escape sequence
100 function In_Char return Character is
106 function WC_In is new Char_Sequence_To_UTF_32 (In_Char);
108 -- Start of processingf for Scan_Wide
111 C := Char_Code (WC_In (In_Char, Wide_Character_Encoding_Method));
113 Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
116 when Constraint_Error =>
131 procedure Out_Char (C : Character);
132 -- Procedure to store one character of wide character sequence
138 procedure Out_Char (C : Character) is
144 procedure WC_Out is new UTF_32_To_Char_Sequence (Out_Char);
146 -- Start of processing for Set_Wide
149 WC_Out (UTF_32_Code (C), Wide_Character_Encoding_Method);
156 procedure Skip_Wide (S : String; P : in out Natural) is
157 P_Init : constant Natural := P;
159 function Skip_Char return Character;
160 -- Function to skip one character of wide character escape sequence
166 function Skip_Char return Character is
172 function WC_Skip is new Char_Sequence_To_UTF_32 (Skip_Char);
174 Discard : UTF_32_Code;
175 pragma Warnings (Off, Discard);
177 -- Start of processing for Skip_Wide
180 Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
181 Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);
188 procedure Skip_Wide (S : Source_Buffer_Ptr; P : in out Source_Ptr) is
189 P_Init : constant Source_Ptr := P;
191 function Skip_Char return Character;
192 -- Function to skip one character of wide character escape sequence
198 function Skip_Char return Character is
204 function WC_Skip is new Char_Sequence_To_UTF_32 (Skip_Char);
206 Discard : UTF_32_Code;
207 pragma Warnings (Off, Discard);
209 -- Start of processing for Skip_Wide
212 Discard := WC_Skip (Skip_Char, Wide_Character_Encoding_Method);
213 Wide_Char_Byte_Count := Wide_Char_Byte_Count + Nat (P - P_Init - 1);