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164 | -- -*- coding: utf-8 -*-
--
-- ZanyBlue, an Ada library and framework for finite element analysis.
--
-- Copyright (c) 2012, 2018, Michael Rohan <mrohan@zanyblue.com>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
--
-- * Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
--
-- * Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- * Neither the name of ZanyBlue nor the names of its contributors may
-- be used to endorse or promote products derived from this software
-- without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--
with Ada.Text_IO.Text_Streams;
with ZanyBlue.OS;
with ZanyBlue.Directories;
package body ZanyBlue.Text is
use ZanyBlue.OS;
Update_Extension : constant String := ".zbtmp";
----------------------
-- Close_And_Update --
----------------------
procedure Close_And_Update
(File : in out UXStrings.Text_IO.File_Type;
Updated : out Boolean)
is
use UXStrings.Text_IO;
use ZanyBlue.Directories;
Len : constant Natural := Update_Extension.Length;
File_Name : constant String := Name (File);
Real_Name : constant String := Head (File_Name, File_Name.Length - Len);
begin
Close (File);
Updated := Files_Differ (File_Name, Real_Name);
if Updated then
if Exists (Real_Name) then
Delete_File (Real_Name);
end if;
Rename (File_Name, Real_Name);
else
Delete_File (File_Name);
end if;
end Close_And_Update;
------------------
-- Files_Differ --
------------------
function Files_Differ
(Left_File_Name : String;
Right_File_Name : String)
return Boolean
is
use Ada.Text_IO;
use Ada.Text_IO.Text_Streams;
Result : Boolean := False;
Done : Boolean := False;
Left_Ch : Character;
Right_Ch : Character;
Left_Stream : Stream_Access;
Right_Stream : Stream_Access;
Left : File_Type;
Right : File_Type;
begin
Open (Left, In_File, To_UTF_8 (Left_File_Name));
Open (Right, In_File, To_UTF_8 (Right_File_Name));
Left_Stream := Stream (Left);
Right_Stream := Stream (Right);
while not Done loop
Done := End_Of_File (Left) or End_Of_File (Right);
if not Done then
Character'Read (Left_Stream, Left_Ch);
Character'Read (Right_Stream, Right_Ch);
Result := Left_Ch /= Right_Ch;
Done := Result;
end if;
end loop;
Result := Result or else (End_Of_File (Left) xor End_Of_File (Right));
Close (Left);
Close (Right);
return Result;
exception
when Name_Error =>
if Is_Open (Left) then
Close (Left);
end if;
if Is_Open (Right) then
Close (Right);
end if;
return True;
end Files_Differ;
----------------------------
-- Wide_Create_For_Update --
----------------------------
procedure Wide_Create_For_Update
(File : in out UXStrings.Text_IO.File_Type;
Name : String)
is
use UXStrings.Text_IO;
begin
Create (File, Name & Update_Extension);
end Wide_Create_For_Update;
---------------
-- Wide_Hash --
---------------
function Wide_Hash
(Key : String)
return Ada.Containers.Hash_Type
is
use Ada.Containers;
function Shift_Left
(Value : Hash_Type;
Amount : Natural)
return Hash_Type;
pragma Import (Intrinsic, Shift_Left);
H : Hash_Type;
begin
H := 0;
for J in Key loop
H :=
Unicode_Character'Pos (Key (J)) + Shift_Left (H, 6) +
Shift_Left (H, 16) - H;
end loop;
return H;
end Wide_Hash;
end ZanyBlue.Text;
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