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Diffstat (limited to 'gcc-4.8.3/gcc/ada/widechar.ads')
| -rw-r--r-- | gcc-4.8.3/gcc/ada/widechar.ads | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/gcc-4.8.3/gcc/ada/widechar.ads b/gcc-4.8.3/gcc/ada/widechar.ads new file mode 100644 index 000000000..7db577add --- /dev/null +++ b/gcc-4.8.3/gcc/ada/widechar.ads @@ -0,0 +1,98 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- W I D E C H A R -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2009 Free Software Foundation, Inc. -- +-- -- +-- GNAT is free software; you can redistribute it and/or modify it under -- +-- terms of the GNU General Public License as published by the Free Soft- -- +-- ware Foundation; either version 3, or (at your option) any later ver- -- +-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- +-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- +-- or FITNESS FOR A PARTICULAR PURPOSE. -- +-- -- +-- As a special exception under Section 7 of GPL version 3, you are granted -- +-- additional permissions described in the GCC Runtime Library Exception, -- +-- version 3.1, as published by the Free Software Foundation. -- +-- -- +-- You should have received a copy of the GNU General Public License and -- +-- a copy of the GCC Runtime Library Exception along with this program; -- +-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- Subprograms for manipulation of wide character sequences. Note that in +-- this package, wide character and wide wide character are not distinguished +-- since this package is basically concerned with syntactic notions, and it +-- deals with Char_Code values, rather than values of actual Ada types. + +with Types; use Types; + +package Widechar is + + Wide_Char_Byte_Count : Nat := 0; + -- This value is incremented whenever Scan_Wide or Skip_Wide is called. + -- The amount added is the length of the wide character sequence minus + -- one. This means that the count that accumulates here represents the + -- difference between the length in characters and the length in bytes. + -- This is used for checking the line length in characters. + + function Length_Wide return Nat; + -- Returns the maximum length in characters for the escape sequence that + -- is used to encode wide character literals outside the ASCII range. Used + -- only in the implementation of the attribute Width for Wide_Character + -- and Wide_Wide_Character. + + procedure Scan_Wide + (S : Source_Buffer_Ptr; + P : in out Source_Ptr; + C : out Char_Code; + Err : out Boolean); + -- On entry S (P) points to the first character in the source text for + -- a wide character (i.e. to an ESC character, a left bracket, or an + -- upper half character, depending on the representation method). A + -- single wide character is scanned. If no error is found, the value + -- stored in C is the code for this wide character, P is updated past + -- the sequence and Err is set to False. If an error is found, then + -- P points to the improper character, C is undefined, and Err is + -- set to True. + + procedure Set_Wide + (C : Char_Code; + S : in out String; + P : in out Natural); + -- The escape sequence (including any leading ESC character) for the + -- given character code is stored starting at S (P + 1), and on return + -- P points to the last stored character (i.e. P is the count of stored + -- characters on entry and exit, and the escape sequence is appended to + -- the end of the stored string). The character code C represents a code + -- originally constructed by Scan_Wide, so it is known to be in a range + -- that is appropriate for the encoding method in use. + + procedure Skip_Wide (S : String; P : in out Natural); + -- On entry, S (P) points to an ESC character for a wide character escape + -- sequence or to an upper half character if the encoding method uses the + -- upper bit, or to a left bracket if the brackets encoding method is in + -- use. On exit, P is bumped past the wide character sequence. No error + -- checking is done, since this is only used on escape sequences generated + -- by Set_Wide, which are known to be correct. + + procedure Skip_Wide (S : Source_Buffer_Ptr; P : in out Source_Ptr); + -- Similar to the above procedure, but operates on a source buffer + -- instead of a string, with P being a Source_Ptr referencing the + -- contents of the source buffer. + + function Is_Start_Of_Wide_Char + (S : Source_Buffer_Ptr; + P : Source_Ptr) return Boolean; + -- Determines if S (P) is the start of a wide character sequence + +end Widechar; |