1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- W I D E C H A R -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1992-1998 Free Software Foundation, Inc. -- 10-- -- 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. -- 21-- -- 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. -- 28-- -- 29-- GNAT was originally developed by the GNAT team at New York University. -- 30-- Extensive contributions were provided by Ada Core Technologies Inc. -- 31-- -- 32------------------------------------------------------------------------------ 33 34-- Subprograms for manipulation of wide character sequences 35 36with Types; use Types; 37 38package Widechar is 39 40 function Length_Wide return Nat; 41 -- Returns the maximum length in characters for the escape sequence that 42 -- is used to encode wide character literals outside the ASCII range. Used 43 -- only in the implementation of the attribute Width for Wide_Character. 44 45 procedure Scan_Wide 46 (S : Source_Buffer_Ptr; 47 P : in out Source_Ptr; 48 C : out Char_Code; 49 Err : out Boolean); 50 -- On entry S (P) points to the first character in the source text for 51 -- a wide character (i.e. to an ESC character, a left bracket, or an 52 -- upper half character, depending on the representation method). A 53 -- single wide character is scanned. If no error is found, the value 54 -- stored in C is the code for this wide character, P is updated past 55 -- the sequence and Err is set to False. If an error is found, then 56 -- P points to the improper character, C is undefined, and Err is 57 -- set to True. 58 59 procedure Set_Wide 60 (C : Char_Code; 61 S : in out String; 62 P : in out Natural); 63 -- The escape sequence (including any leading ESC character) for the 64 -- given character code is stored starting at S (P + 1), and on return 65 -- P points to the last stored character (i.e. P is the count of stored 66 -- characters on entry and exit, and the escape sequence is appended to 67 -- the end of the stored string). The character code C represents a code 68 -- originally constructed by Scan_Wide, so it is known to be in a range 69 -- that is appropriate for the encoding method in use. 70 71 procedure Skip_Wide (S : String; P : in out Natural); 72 -- On entry, S (P) points to an ESC character for a wide character escape 73 -- sequence or to an upper half character if the encoding method uses the 74 -- upper bit, or to a left bracket if the brackets encoding method is in 75 -- use. On exit, P is bumped past the wide character sequence. No error 76 -- checking is done, since this is only used on escape sequences generated 77 -- by Set_Wide, which are known to be correct. 78 79 function Is_Start_Of_Wide_Char 80 (S : Source_Buffer_Ptr; 81 P : Source_Ptr) 82 return Boolean; 83 -- Determines if S (P) is the start of a wide character sequence 84 85end Widechar; 86