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-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- A D A . C H A R A C T E R S . H A N D L I N G --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2020, 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. --
-- --
------------------------------------------------------------------------------
with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
with Ada.Strings.Maps; use Ada.Strings.Maps;
with Ada.Strings.Maps.Constants; use Ada.Strings.Maps.Constants;
package body Ada.Characters.Handling is
------------------------------------
-- Character Classification Table --
------------------------------------
type Character_Flags is mod 256;
for Character_Flags'Size use 8;
Control : constant Character_Flags := 1;
Lower : constant Character_Flags := 2;
Upper : constant Character_Flags := 4;
Basic : constant Character_Flags := 8;
Hex_Digit : constant Character_Flags := 16;
Digit : constant Character_Flags := 32;
Special : constant Character_Flags := 64;
Line_Term : constant Character_Flags := 128;
Letter : constant Character_Flags := Lower or Upper;
Alphanum : constant Character_Flags := Letter or Digit;
Graphic : constant Character_Flags := Alphanum or Special;
Char_Map : constant array (Character) of Character_Flags :=
(
NUL => Control,
SOH => Control,
STX => Control,
ETX => Control,
EOT => Control,
ENQ => Control,
ACK => Control,
BEL => Control,
BS => Control,
HT => Control,
LF => Control + Line_Term,
VT => Control + Line_Term,
FF => Control + Line_Term,
CR => Control + Line_Term,
SO => Control,
SI => Control,
DLE => Control,
DC1 => Control,
DC2 => Control,
DC3 => Control,
DC4 => Control,
NAK => Control,
SYN => Control,
ETB => Control,
CAN => Control,
EM => Control,
SUB => Control,
ESC => Control,
FS => Control,
GS => Control,
RS => Control,
US => Control,
Space => Special,
Exclamation => Special,
Quotation => Special,
Number_Sign => Special,
Dollar_Sign => Special,
Percent_Sign => Special,
Ampersand => Special,
Apostrophe => Special,
Left_Parenthesis => Special,
Right_Parenthesis => Special,
Asterisk => Special,
Plus_Sign => Special,
Comma => Special,
Hyphen => Special,
Full_Stop => Special,
Solidus => Special,
'0' .. '9' => Digit + Hex_Digit,
Colon => Special,
Semicolon => Special,
Less_Than_Sign => Special,
Equals_Sign => Special,
Greater_Than_Sign => Special,
Question => Special,
Commercial_At => Special,
'A' .. 'F' => Upper + Basic + Hex_Digit,
'G' .. 'Z' => Upper + Basic,
Left_Square_Bracket => Special,
Reverse_Solidus => Special,
Right_Square_Bracket => Special,
Circumflex => Special,
Low_Line => Special,
Grave => Special,
'a' .. 'f' => Lower + Basic + Hex_Digit,
'g' .. 'z' => Lower + Basic,
Left_Curly_Bracket => Special,
Vertical_Line => Special,
Right_Curly_Bracket => Special,
Tilde => Special,
DEL => Control,
Reserved_128 => Control,
Reserved_129 => Control,
BPH => Control,
NBH => Control,
Reserved_132 => Control,
NEL => Control + Line_Term,
SSA => Control,
ESA => Control,
HTS => Control,
HTJ => Control,
VTS => Control,
PLD => Control,
PLU => Control,
RI => Control,
SS2 => Control,
SS3 => Control,
DCS => Control,
PU1 => Control,
PU2 => Control,
STS => Control,
CCH => Control,
MW => Control,
SPA => Control,
EPA => Control,
SOS => Control,
Reserved_153 => Control,
SCI => Control,
CSI => Control,
ST => Control,
OSC => Control,
PM => Control,
APC => Control,
No_Break_Space => Special,
Inverted_Exclamation => Special,
Cent_Sign => Special,
Pound_Sign => Special,
Currency_Sign => Special,
Yen_Sign => Special,
Broken_Bar => Special,
Section_Sign => Special,
Diaeresis => Special,
Copyright_Sign => Special,
Feminine_Ordinal_Indicator => Special,
Left_Angle_Quotation => Special,
Not_Sign => Special,
Soft_Hyphen => Special,
Registered_Trade_Mark_Sign => Special,
Macron => Special,
Degree_Sign => Special,
Plus_Minus_Sign => Special,
Superscript_Two => Special,
Superscript_Three => Special,
Acute => Special,
Micro_Sign => Special,
Pilcrow_Sign => Special,
Middle_Dot => Special,
Cedilla => Special,
Superscript_One => Special,
Masculine_Ordinal_Indicator => Special,
Right_Angle_Quotation => Special,
Fraction_One_Quarter => Special,
Fraction_One_Half => Special,
Fraction_Three_Quarters => Special,
Inverted_Question => Special,
UC_A_Grave => Upper,
UC_A_Acute => Upper,
UC_A_Circumflex => Upper,
UC_A_Tilde => Upper,
UC_A_Diaeresis => Upper,
UC_A_Ring => Upper,
UC_AE_Diphthong => Upper + Basic,
UC_C_Cedilla => Upper,
UC_E_Grave => Upper,
UC_E_Acute => Upper,
UC_E_Circumflex => Upper,
UC_E_Diaeresis => Upper,
UC_I_Grave => Upper,
UC_I_Acute => Upper,
UC_I_Circumflex => Upper,
UC_I_Diaeresis => Upper,
UC_Icelandic_Eth => Upper + Basic,
UC_N_Tilde => Upper,
UC_O_Grave => Upper,
UC_O_Acute => Upper,
UC_O_Circumflex => Upper,
UC_O_Tilde => Upper,
UC_O_Diaeresis => Upper,
Multiplication_Sign => Special,
UC_O_Oblique_Stroke => Upper,
UC_U_Grave => Upper,
UC_U_Acute => Upper,
UC_U_Circumflex => Upper,
UC_U_Diaeresis => Upper,
UC_Y_Acute => Upper,
UC_Icelandic_Thorn => Upper + Basic,
LC_German_Sharp_S => Lower + Basic,
LC_A_Grave => Lower,
LC_A_Acute => Lower,
LC_A_Circumflex => Lower,
LC_A_Tilde => Lower,
LC_A_Diaeresis => Lower,
LC_A_Ring => Lower,
LC_AE_Diphthong => Lower + Basic,
LC_C_Cedilla => Lower,
LC_E_Grave => Lower,
LC_E_Acute => Lower,
LC_E_Circumflex => Lower,
LC_E_Diaeresis => Lower,
LC_I_Grave => Lower,
LC_I_Acute => Lower,
LC_I_Circumflex => Lower,
LC_I_Diaeresis => Lower,
LC_Icelandic_Eth => Lower + Basic,
LC_N_Tilde => Lower,
LC_O_Grave => Lower,
LC_O_Acute => Lower,
LC_O_Circumflex => Lower,
LC_O_Tilde => Lower,
LC_O_Diaeresis => Lower,
Division_Sign => Special,
LC_O_Oblique_Stroke => Lower,
LC_U_Grave => Lower,
LC_U_Acute => Lower,
LC_U_Circumflex => Lower,
LC_U_Diaeresis => Lower,
LC_Y_Acute => Lower,
LC_Icelandic_Thorn => Lower + Basic,
LC_Y_Diaeresis => Lower
);
---------------------
-- Is_Alphanumeric --
---------------------
function Is_Alphanumeric (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Alphanum) /= 0;
end Is_Alphanumeric;
--------------
-- Is_Basic --
--------------
function Is_Basic (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Basic) /= 0;
end Is_Basic;
------------------
-- Is_Character --
------------------
function Is_Character (Item : Wide_Character) return Boolean is
begin
return Wide_Character'Pos (Item) < 256;
end Is_Character;
----------------
-- Is_Control --
----------------
function Is_Control (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Control) /= 0;
end Is_Control;
--------------
-- Is_Digit --
--------------
function Is_Digit (Item : Character) return Boolean is
begin
return Item in '0' .. '9';
end Is_Digit;
----------------
-- Is_Graphic --
----------------
function Is_Graphic (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Graphic) /= 0;
end Is_Graphic;
--------------------------
-- Is_Hexadecimal_Digit --
--------------------------
function Is_Hexadecimal_Digit (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Hex_Digit) /= 0;
end Is_Hexadecimal_Digit;
----------------
-- Is_ISO_646 --
----------------
function Is_ISO_646 (Item : Character) return Boolean is
begin
return Item in ISO_646;
end Is_ISO_646;
-- Note: much more efficient coding of the following function is possible
-- by testing several 16#80# bits in a complete word in a single operation
function Is_ISO_646 (Item : String) return Boolean is
begin
for J in Item'Range loop
if Item (J) not in ISO_646 then
return False;
end if;
end loop;
return True;
end Is_ISO_646;
---------------
-- Is_Letter --
---------------
function Is_Letter (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Letter) /= 0;
end Is_Letter;
------------------------
-- Is_Line_Terminator --
------------------------
function Is_Line_Terminator (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Line_Term) /= 0;
end Is_Line_Terminator;
--------------
-- Is_Lower --
--------------
function Is_Lower (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Lower) /= 0;
end Is_Lower;
-------------
-- Is_Mark --
-------------
function Is_Mark (Item : Character) return Boolean is
pragma Unreferenced (Item);
begin
return False;
end Is_Mark;
-------------
-- Is_NFKC --
-------------
function Is_NFKC (Item : Character) return Boolean is
begin
return Character'Pos (Item) not in
160 | 168 | 170 | 175 | 178 | 179 | 180 | 181 | 184 | 185 | 186 |
188 | 189 | 190;
end Is_NFKC;
---------------------
-- Is_Other_Format --
---------------------
function Is_Other_Format (Item : Character) return Boolean is
begin
return Item = Soft_Hyphen;
end Is_Other_Format;
------------------------------
-- Is_Punctuation_Connector --
------------------------------
function Is_Punctuation_Connector (Item : Character) return Boolean is
begin
return Item = '_';
end Is_Punctuation_Connector;
--------------
-- Is_Space --
--------------
function Is_Space (Item : Character) return Boolean is
begin
return Item = ' ' or else Item = No_Break_Space;
end Is_Space;
----------------
-- Is_Special --
----------------
function Is_Special (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Special) /= 0;
end Is_Special;
---------------
-- Is_String --
---------------
function Is_String (Item : Wide_String) return Boolean is
begin
for J in Item'Range loop
if Wide_Character'Pos (Item (J)) >= 256 then
return False;
end if;
end loop;
return True;
end Is_String;
--------------
-- Is_Upper --
--------------
function Is_Upper (Item : Character) return Boolean is
begin
return (Char_Map (Item) and Upper) /= 0;
end Is_Upper;
--------------
-- To_Basic --
--------------
function To_Basic (Item : Character) return Character is
begin
return Value (Basic_Map, Item);
end To_Basic;
function To_Basic (Item : String) return String is
begin
return Result : String (1 .. Item'Length) do
for J in Item'Range loop
Result (J - (Item'First - 1)) := Value (Basic_Map, Item (J));
end loop;
end return;
end To_Basic;
------------------
-- To_Character --
------------------
function To_Character
(Item : Wide_Character;
Substitute : Character := ' ') return Character
is
begin
if Is_Character (Item) then
return Character'Val (Wide_Character'Pos (Item));
else
return Substitute;
end if;
end To_Character;
----------------
-- To_ISO_646 --
----------------
function To_ISO_646
(Item : Character;
Substitute : ISO_646 := ' ') return ISO_646
is
begin
return (if Item in ISO_646 then Item else Substitute);
end To_ISO_646;
function To_ISO_646
(Item : String;
Substitute : ISO_646 := ' ') return String
is
Result : String (1 .. Item'Length);
begin
for J in Item'Range loop
Result (J - (Item'First - 1)) :=
(if Item (J) in ISO_646 then Item (J) else Substitute);
end loop;
return Result;
end To_ISO_646;
--------------
-- To_Lower --
--------------
function To_Lower (Item : Character) return Character is
begin
return Value (Lower_Case_Map, Item);
end To_Lower;
function To_Lower (Item : String) return String is
begin
return Result : String (1 .. Item'Length) do
for J in Item'Range loop
Result (J - (Item'First - 1)) := Value (Lower_Case_Map, Item (J));
end loop;
end return;
end To_Lower;
---------------
-- To_String --
---------------
function To_String
(Item : Wide_String;
Substitute : Character := ' ') return String
is
Result : String (1 .. Item'Length);
begin
for J in Item'Range loop
Result (J - (Item'First - 1)) := To_Character (Item (J), Substitute);
end loop;
return Result;
end To_String;
--------------
-- To_Upper --
--------------
function To_Upper
(Item : Character) return Character
is
begin
return Value (Upper_Case_Map, Item);
end To_Upper;
function To_Upper
(Item : String) return String
is
begin
return Result : String (1 .. Item'Length) do
for J in Item'Range loop
Result (J - (Item'First - 1)) := Value (Upper_Case_Map, Item (J));
end loop;
end return;
end To_Upper;
-----------------------
-- To_Wide_Character --
-----------------------
function To_Wide_Character
(Item : Character) return Wide_Character
is
begin
return Wide_Character'Val (Character'Pos (Item));
end To_Wide_Character;
--------------------
-- To_Wide_String --
--------------------
function To_Wide_String
(Item : String) return Wide_String
is
Result : Wide_String (1 .. Item'Length);
begin
for J in Item'Range loop
Result (J - (Item'First - 1)) := To_Wide_Character (Item (J));
end loop;
return Result;
end To_Wide_String;
end Ada.Characters.Handling;
|