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------------------------------------------------------------------------------
-- --
-- ASIS UTILITY LIBRARY COMPONENTS --
-- --
-- A S I S _ U L . M I S C --
-- --
-- B o d y --
-- --
-- Copyright (C) 2006, AdaCore --
-- --
-- Asis Utility Library (ASIS UL) is free software; you can redistribute it --
-- and/or modify it under terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2, or (at your --
-- option) any later version. ASIS UL is distributed in the hope that it --
-- will be useful, but WITHOUT ANY WARRANTY; without even the implied --
-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the --
-- GNU General Public License for more details. You should have received a --
-- copy of the GNU General Public License distributed with GNAT; see file --
-- COPYING. If not, write to the Free Software Foundation, 59 Temple Place --
-- - Suite 330, Boston, --
-- --
-- ASIS UL is maintained by AdaCore (http://www.adacore.com). --
-- --
------------------------------------------------------------------------------
with Ada.Characters.Handling; use Ada.Characters.Handling;
with Ada.Strings.Fixed;
package body ASIS_UL.Misc is
-----------
-- Image --
-----------
function Image (I : Integer) return String is
begin
return Ada.Strings.Fixed.Trim (Integer'Image (I), Ada.Strings.Both);
end Image;
-------------------
-- Is_Identifier --
-------------------
function Is_Identifier (S : String) return Boolean is
Result : Boolean := False;
begin
if S'Length > 0
and then
Is_Alphanumeric (S (S'First))
then
Result := Is_Identifier_Suffix (S (S'First + 1 .. S'Last));
end if;
return Result;
end Is_Identifier;
--------------------------
-- Is_Identifier_Suffix --
--------------------------
function Is_Identifier_Suffix (Suffix : String) return Boolean is
Result : Boolean := True;
Last_Char_Was_Underline : Boolean := False;
begin
for J in Suffix'Range loop
if Is_Alphanumeric (Suffix (J)) then
Last_Char_Was_Underline := False;
elsif Suffix (J) = '_' then
if Last_Char_Was_Underline then
Result := False;
exit;
else
Last_Char_Was_Underline := True;
end if;
else
Result := False;
exit;
end if;
end loop;
if Result then
Result := Suffix (Suffix'Last) /= '_';
end if;
return Result;
end Is_Identifier_Suffix;
--------------------
-- Is_White_Space --
--------------------
function Is_White_Space (Ch : Character) return Boolean is
begin
return Ch = ' ' or else Ch = ASCII.HT;
end Is_White_Space;
-----------------------
-- String_Hash_Table --
-----------------------
package body String_Hash_Table is
----------
-- Hash --
----------
function Hash (Name : String) return Hash_Index_Type is
subtype Int_1_12 is Int range 1 .. 12;
-- Used to avoid when others on case jump below
Even_Name_Len : Integer;
-- Last even numbered position (used for >12 case)
-- We take one-to-one the code of the Hash function from Namet
-- (namet.adb, rev. 1.90). Namet.Hash function works on the name
-- buffer defined in Namet. We simulate this buffer by defining the
-- following variables (note converting the argument string to lower
-- case before computing the hash value):
Name_Buffer : constant String := To_Lower (Name);
-- Note, that out Has function is not case-sensitive!
Name_Len : constant Natural := Name_Buffer'Last;
begin
-- Special test for 12 (rather than counting on a when others for the
-- case statement below) avoids some Ada compilers converting the
-- case statement into successive jumps.
-- The case of a name longer than 12 characters is handled by taking
-- the first 6 odd numbered characters and the last 6 even numbered
-- characters
if Name_Len > 12 then
Even_Name_Len := (Name_Len) / 2 * 2;
return ((((((((((((
Character'Pos (Name_Buffer (01))) * 2 +
Character'Pos (Name_Buffer (Even_Name_Len - 10))) * 2 +
Character'Pos (Name_Buffer (03))) * 2 +
Character'Pos (Name_Buffer (Even_Name_Len - 08))) * 2 +
Character'Pos (Name_Buffer (05))) * 2 +
Character'Pos (Name_Buffer (Even_Name_Len - 06))) * 2 +
Character'Pos (Name_Buffer (07))) * 2 +
Character'Pos (Name_Buffer (Even_Name_Len - 04))) * 2 +
Character'Pos (Name_Buffer (09))) * 2 +
Character'Pos (Name_Buffer (Even_Name_Len - 02))) * 2 +
Character'Pos (Name_Buffer (11))) * 2 +
Character'Pos (Name_Buffer (Even_Name_Len))) mod Hash_Num;
end if;
-- For the cases of 1-12 characters, all characters participate in
-- the hash. The positioning is randomized, with the bias that
-- characters later on participate fully (i.e. are added towards the
-- right side).
case Int_1_12 (Name_Len) is
when 1 =>
return Character'Pos (Name_Buffer (1));
when 2 =>
return ((
Character'Pos (Name_Buffer (1))) * 64 +
Character'Pos (Name_Buffer (2))) mod Hash_Num;
when 3 =>
return (((
Character'Pos (Name_Buffer (1))) * 16 +
Character'Pos (Name_Buffer (3))) * 16 +
Character'Pos (Name_Buffer (2))) mod Hash_Num;
when 4 =>
return ((((
Character'Pos (Name_Buffer (1))) * 8 +
Character'Pos (Name_Buffer (2))) * 8 +
Character'Pos (Name_Buffer (3))) * 8 +
Character'Pos (Name_Buffer (4))) mod Hash_Num;
when 5 =>
return (((((
Character'Pos (Name_Buffer (4))) * 8 +
Character'Pos (Name_Buffer (1))) * 4 +
Character'Pos (Name_Buffer (3))) * 4 +
Character'Pos (Name_Buffer (5))) * 8 +
Character'Pos (Name_Buffer (2))) mod Hash_Num;
when 6 =>
return ((((((
Character'Pos (Name_Buffer (5))) * 4 +
Character'Pos (Name_Buffer (1))) * 4 +
Character'Pos (Name_Buffer (4))) * 4 +
Character'Pos (Name_Buffer (2))) * 4 +
Character'Pos (Name_Buffer (6))) * 4 +
Character'Pos (Name_Buffer (3))) mod Hash_Num;
when 7 =>
return (((((((
Character'Pos (Name_Buffer (4))) * 4 +
Character'Pos (Name_Buffer (3))) * 4 +
Character'Pos (Name_Buffer (1))) * 4 +
Character'Pos (Name_Buffer (2))) * 2 +
Character'Pos (Name_Buffer (5))) * 2 +
Character'Pos (Name_Buffer (7))) * 2 +
Character'Pos (Name_Buffer (6))) mod Hash_Num;
when 8 =>
return ((((((((
Character'Pos (Name_Buffer (2))) * 4 +
Character'Pos (Name_Buffer (1))) * 4 +
Character'Pos (Name_Buffer (3))) * 2 +
Character'Pos (Name_Buffer (5))) * 2 +
Character'Pos (Name_Buffer (7))) * 2 +
Character'Pos (Name_Buffer (6))) * 2 +
Character'Pos (Name_Buffer (4))) * 2 +
Character'Pos (Name_Buffer (8))) mod Hash_Num;
when 9 =>
return (((((((((
Character'Pos (Name_Buffer (2))) * 4 +
Character'Pos (Name_Buffer (1))) * 4 +
Character'Pos (Name_Buffer (3))) * 4 +
Character'Pos (Name_Buffer (4))) * 2 +
Character'Pos (Name_Buffer (8))) * 2 +
Character'Pos (Name_Buffer (7))) * 2 +
Character'Pos (Name_Buffer (5))) * 2 +
Character'Pos (Name_Buffer (6))) * 2 +
Character'Pos (Name_Buffer (9))) mod Hash_Num;
when 10 =>
return ((((((((((
Character'Pos (Name_Buffer (01))) * 2 +
Character'Pos (Name_Buffer (02))) * 2 +
Character'Pos (Name_Buffer (08))) * 2 +
Character'Pos (Name_Buffer (03))) * 2 +
Character'Pos (Name_Buffer (04))) * 2 +
Character'Pos (Name_Buffer (09))) * 2 +
Character'Pos (Name_Buffer (06))) * 2 +
Character'Pos (Name_Buffer (05))) * 2 +
Character'Pos (Name_Buffer (07))) * 2 +
Character'Pos (Name_Buffer (10))) mod Hash_Num;
when 11 =>
return (((((((((((
Character'Pos (Name_Buffer (05))) * 2 +
Character'Pos (Name_Buffer (01))) * 2 +
Character'Pos (Name_Buffer (06))) * 2 +
Character'Pos (Name_Buffer (09))) * 2 +
Character'Pos (Name_Buffer (07))) * 2 +
Character'Pos (Name_Buffer (03))) * 2 +
Character'Pos (Name_Buffer (08))) * 2 +
Character'Pos (Name_Buffer (02))) * 2 +
Character'Pos (Name_Buffer (10))) * 2 +
Character'Pos (Name_Buffer (04))) * 2 +
Character'Pos (Name_Buffer (11))) mod Hash_Num;
when 12 =>
return ((((((((((((
Character'Pos (Name_Buffer (03))) * 2 +
Character'Pos (Name_Buffer (02))) * 2 +
Character'Pos (Name_Buffer (05))) * 2 +
Character'Pos (Name_Buffer (01))) * 2 +
Character'Pos (Name_Buffer (06))) * 2 +
Character'Pos (Name_Buffer (04))) * 2 +
Character'Pos (Name_Buffer (08))) * 2 +
Character'Pos (Name_Buffer (11))) * 2 +
Character'Pos (Name_Buffer (07))) * 2 +
Character'Pos (Name_Buffer (09))) * 2 +
Character'Pos (Name_Buffer (10))) * 2 +
Character'Pos (Name_Buffer (12))) mod Hash_Num;
end case;
end Hash;
end String_Hash_Table;
end ASIS_UL.Misc;
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