1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- S Y S T E M . W C H _ S T W --
9 -- Copyright (C) 1992-2008, 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 with System
.WCh_Con
; use System
.WCh_Con
;
35 with System
.WCh_Cnv
; use System
.WCh_Cnv
;
37 package body System
.WCh_StW
is
39 -----------------------
40 -- Local Subprograms --
41 -----------------------
43 procedure Get_Next_Code
47 EM
: WC_Encoding_Method
);
48 -- Scans next character starting at S(P) and returns its value in V. On
49 -- exit P is updated past the last character read. Raises Constraint_Error
50 -- if the string is not well formed. Raises Constraint_Error if the code
51 -- value is greater than 16#7FFF_FFFF#. On entry P <= S'Last.
57 procedure Get_Next_Code
61 EM
: WC_Encoding_Method
)
63 function In_Char
return Character;
64 -- Function to return a character, bumping P, raises Constraint_Error
65 -- if P > S'Last on entry.
67 function Get_UTF_32
is new Char_Sequence_To_UTF_32
(In_Char
);
68 -- Function to get next UFT_32 value
74 function In_Char
return Character is
77 raise Constraint_Error
with "badly formed wide character code";
84 -- Start of processing for Get_Next_Code
87 -- Check for wide character encoding
91 if S
(P
) = ASCII
.ESC
then
92 V
:= Get_UTF_32
(In_Char
, EM
);
96 when WCEM_Upper | WCEM_Shift_JIS | WCEM_EUC | WCEM_UTF8
=>
97 if S
(P
) >= Character'Val (16#
80#
) then
98 V
:= Get_UTF_32
(In_Char
, EM
);
102 when WCEM_Brackets
=>
105 and then S
(P
+ 1) = '"'
106 and then S
(P
+ 2) /= '"'
108 V
:= Get_UTF_32
(In_Char
, EM
);
113 -- If it is not a wide character code, just get it
115 V
:= Character'Pos (S
(P
));
119 ---------------------------
120 -- String_To_Wide_String --
121 ---------------------------
123 procedure String_To_Wide_String
127 EM
: System
.WCh_Con
.WC_Encoding_Method
)
133 pragma Assert
(S
'First = 1);
137 while SP
<= S
'Last loop
138 Get_Next_Code
(S
, SP
, V
, EM
);
141 raise Constraint_Error
with
142 "out of range value for wide character";
146 R
(L
) := Wide_Character'Val (V
);
148 end String_To_Wide_String
;
150 --------------------------------
151 -- String_To_Wide_Wide_String --
152 --------------------------------
154 procedure String_To_Wide_Wide_String
156 R
: out Wide_Wide_String
;
158 EM
: System
.WCh_Con
.WC_Encoding_Method
)
160 pragma Assert
(S
'First = 1);
168 while SP
<= S
'Last loop
169 Get_Next_Code
(S
, SP
, V
, EM
);
171 R
(L
) := Wide_Wide_Character
'Val (V
);
173 end String_To_Wide_Wide_String
;