/usr/share/ada/adainclude/xmlada/sax-symbols.ads is in libxmlada5-dev 4.4.2014-1.
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-- XML/Ada - An XML suite for Ada95 --
-- --
-- Copyright (C) 2010-2014, AdaCore --
-- --
-- This library 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 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- You should have received a copy of the GNU General Public License along --
-- with this program; see the file COPYING3. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
-- A symbol table.
-- This provides integers to represent strings internally. The implementation
-- is copied from namet.adb, in the GNAT sources
with Interfaces;
with Sax.HTable;
with Sax.Pointers;
with Unicode.CES; use Unicode.CES;
package Sax.Symbols is
type Symbol_Table_Record is new Sax.Pointers.Root_Encapsulated with private;
type Symbol_Table_Access is access all Symbol_Table_Record'Class;
-- A symbol table associating integers with strings.
-- By default, this is not task safe, so you will need to extend this if
-- the symbol is to be shared between multiple tasks.
type Symbol is private;
No_Symbol : constant Symbol;
Empty_String : constant Symbol;
function Find
(Table : access Symbol_Table_Record;
Str : Unicode.CES.Byte_Sequence) return Symbol;
-- Return the internal version of Str.
-- Comparing Symbol is the same as comparing the string itself, but much
-- faster.
function Get (Sym : Symbol) return Cst_Byte_Sequence_Access;
pragma Inline_Always (Get);
-- The string associated with the symbol.
-- The returned string must not be deallocated, it points to internal data
procedure Free (Table : in out Symbol_Table_Record);
-- Free the table
function Hash (S : Symbol) return Interfaces.Unsigned_32;
-- Returns a hash for the symbol
function "=" (S : Symbol; Str : Unicode.CES.Byte_Sequence) return Boolean;
-- Compare [S] and [Str]
function Debug_Print (S : Symbol) return String;
-- Return a displaying version of symbol (debugging purposes only)
private
type Symbol is new Cst_Byte_Sequence_Access;
Cst_Empty_String : aliased constant Unicode.CES.Byte_Sequence := "";
No_Symbol : constant Symbol := null;
Empty_String : constant Symbol := Cst_Empty_String'Access;
function Get_Key (Str : Symbol) return Cst_Byte_Sequence_Access;
procedure Free (Str : in out Symbol);
function Hash
(Str : Cst_Byte_Sequence_Access) return Interfaces.Unsigned_32;
function Key_Equal (Key1, Key2 : Cst_Byte_Sequence_Access) return Boolean;
pragma Inline (Hash, Get_Key, Key_Equal);
package String_Htable is new Sax.HTable
(Element => Symbol,
Empty_Element => No_Symbol,
Free => Free,
Key => Cst_Byte_Sequence_Access,
Get_Key => Get_Key,
Hash => Hash,
Equal => Key_Equal);
Hash_Num : constant := 2**16;
-- Number of headers in the hash table
type Hash_Type is range 0 .. Hash_Num - 1;
type Symbol_Table_Record is new Sax.Pointers.Root_Encapsulated with record
Hash : String_Htable.HTable (Hash_Num);
end record;
end Sax.Symbols;
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