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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S T R I N G T --
-- --
-- B o d y --
-- --
-- $Revision: 1.36 $ --
-- --
-- Copyright (C) 1992-1997 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 2, 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. 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, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with Alloc;
with Namet; use Namet;
with Output; use Output;
with Table;
package body Stringt is
-- The following table stores the sequence of character codes for the
-- stored string constants. The entries are referenced from the
-- separate Strings table.
package String_Chars is new Table.Table (
Table_Component_Type => Char_Code,
Table_Index_Type => Int,
Table_Low_Bound => 0,
Table_Initial => Alloc.String_Chars_Initial,
Table_Increment => Alloc.String_Chars_Increment,
Table_Name => "String_Chars");
-- The String_Id values reference entries in the Strings table, which
-- contains String_Entry records that record the length of each stored
-- string and its starting location in the String_Chars table.
type String_Entry is record
String_Index : Int;
Length : Nat;
end record;
package Strings is new Table.Table (
Table_Component_Type => String_Entry,
Table_Index_Type => String_Id,
Table_Low_Bound => First_String_Id,
Table_Initial => Alloc.Strings_Initial,
Table_Increment => Alloc.Strings_Increment,
Table_Name => "Strings");
-- Note: it is possible that two entries in the Strings table can share
-- string data in the String_Chars table, and in particular this happens
-- when Start_String is called with a parameter that is the last string
-- currently allocated in the table.
----------------
-- End_String --
----------------
function End_String return String_Id is
begin
return Strings.Last;
end End_String;
---------------------
-- Get_String_Char --
---------------------
function Get_String_Char (Id : String_Id; Index : Int) return Char_Code is
begin
pragma Assert (Id in First_String_Id .. Strings.Last
and then Index in 1 .. Strings.Table (Id).Length);
return String_Chars.Table (Strings.Table (Id).String_Index + Index - 1);
end Get_String_Char;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
String_Chars.Init;
Strings.Init;
end Initialize;
----------
-- Lock --
----------
procedure Lock is
begin
String_Chars.Locked := True;
Strings.Locked := True;
String_Chars.Release;
Strings.Release;
end Lock;
------------------
-- Start_String --
------------------
procedure Start_String is
begin
Strings.Increment_Last;
Strings.Table (Strings.Last).String_Index := String_Chars.Last + 1;
Strings.Table (Strings.Last).Length := 0;
end Start_String;
procedure Start_String (S : String_Id) is
begin
Strings.Increment_Last;
-- Case of initial string value is at the end of the string characters
-- table, so it does not need copying, instead it can be shared.
if Strings.Table (S).String_Index + Strings.Table (S).Length =
String_Chars.Last + 1
then
Strings.Table (Strings.Last).String_Index :=
Strings.Table (S).String_Index;
-- Case of initial string value must be copied to new string
else
Strings.Table (Strings.Last).String_Index :=
String_Chars.Last + 1;
for J in 1 .. Strings.Table (S).Length loop
String_Chars.Increment_Last;
String_Chars.Table (String_Chars.Last) :=
String_Chars.Table (Strings.Table (S).String_Index + (J - 1));
end loop;
end if;
-- In either case the result string length is copied from the argument
Strings.Table (Strings.Last).Length := Strings.Table (S).Length;
end Start_String;
-----------------------
-- Store_String_Char --
-----------------------
procedure Store_String_Char (C : Char_Code) is
begin
String_Chars.Increment_Last;
String_Chars.Table (String_Chars.Last) := C;
Strings.Table (Strings.Last).Length :=
Strings.Table (Strings.Last).Length + 1;
end Store_String_Char;
procedure Store_String_Char (C : Character) is
begin
Store_String_Char (Get_Char_Code (C));
end Store_String_Char;
------------------------
-- Store_String_Chars --
------------------------
procedure Store_String_Chars (S : String) is
begin
for J in S'First .. S'Last loop
Store_String_Char (Get_Char_Code (S (J)));
end loop;
end Store_String_Chars;
----------------------
-- Store_String_Int --
----------------------
procedure Store_String_Int (N : Int) is
begin
if N < 0 then
Store_String_Char ('-');
Store_String_Int (-N);
else
if N > 9 then
Store_String_Int (N / 10);
end if;
Store_String_Char (Character'Val (Character'Pos ('0') + N mod 10));
end if;
end Store_String_Int;
--------------------------
-- String_Chars_Address --
--------------------------
function String_Chars_Address return System.Address is
begin
return String_Chars.Table (0)'Address;
end String_Chars_Address;
------------------
-- String_Equal --
------------------
function String_Equal (L, R : String_Id) return Boolean is
Len : constant Nat := Strings.Table (L).Length;
begin
if Len /= Strings.Table (R).Length then
return False;
else
for J in 1 .. Len loop
if Get_String_Char (L, J) /= Get_String_Char (R, J) then
return False;
end if;
end loop;
return True;
end if;
end String_Equal;
-------------------
-- String_Length --
-------------------
function String_Length (Id : String_Id) return Nat is
begin
return Strings.Table (Id).Length;
end String_Length;
-----------------------------
-- String_From_Name_Buffer --
-----------------------------
function String_From_Name_Buffer return String_Id is
begin
Start_String;
for J in 1 .. Name_Len loop
Store_String_Char (Get_Char_Code (Name_Buffer (J)));
end loop;
return End_String;
end String_From_Name_Buffer;
---------------------------
-- String_To_Name_Buffer --
---------------------------
procedure String_To_Name_Buffer (S : String_Id) is
begin
Name_Len := Natural (String_Length (S));
for J in 1 .. Name_Len loop
Name_Buffer (J) :=
Get_Character (Get_String_Char (S, Int (J)));
end loop;
end String_To_Name_Buffer;
---------------------
-- Strings_Address --
---------------------
function Strings_Address return System.Address is
begin
return Strings.Table (First_String_Id)'Address;
end Strings_Address;
---------------
-- Tree_Read --
---------------
procedure Tree_Read is
begin
String_Chars.Tree_Read;
Strings.Tree_Read;
end Tree_Read;
----------------
-- Tree_Write --
----------------
procedure Tree_Write is
begin
String_Chars.Tree_Write;
Strings.Tree_Write;
end Tree_Write;
-------------------------
-- Unstore_String_Char --
-------------------------
procedure Unstore_String_Char is
begin
String_Chars.Decrement_Last;
Strings.Table (Strings.Last).Length :=
Strings.Table (Strings.Last).Length - 1;
end Unstore_String_Char;
---------------------
-- Write_Char_Code --
---------------------
procedure Write_Char_Code (Code : Char_Code) is
procedure Write_Hex_Byte (J : Natural);
-- Write single hex digit
procedure Write_Hex_Byte (J : Natural) is
Hexd : String := "0123456789abcdef";
begin
Write_Char (Hexd (J / 16 + 1));
Write_Char (Hexd (J mod 16 + 1));
end Write_Hex_Byte;
-- Start of processing for Write_Char_Code
begin
if Code in 16#20# .. 16#7E# then
Write_Char (Character'Val (Code));
else
Write_Char ('[');
Write_Char ('"');
if Code > 16#FF# then
Write_Hex_Byte (Natural (Code / 256));
end if;
Write_Hex_Byte (Natural (Code mod 256));
Write_Char ('"');
Write_Char (']');
end if;
end Write_Char_Code;
------------------------------
-- Write_String_Table_Entry --
------------------------------
procedure Write_String_Table_Entry (Id : String_Id) is
C : Char_Code;
begin
Write_Char ('"');
for I in 1 .. String_Length (Id) loop
C := Get_String_Char (Id, I);
if Character'Val (C) = '"' then
Write_Str ("""""");
else
Write_Char_Code (C);
end if;
end loop;
Write_Char ('"');
end Write_String_Table_Entry;
end Stringt;
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