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308 | --
-- Copyright (C) 2021-2023, AdaCore
--
-- SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
--
with VSS.Implementation.String_Configuration;
package body VSS.Implementation.Null_String_Handlers is
use type VSS.Implementation.Strings.Cursor;
use type VSS.Unicode.UTF16_Code_Unit_Offset;
use type VSS.Unicode.UTF8_Code_Unit_Offset;
Before_First_Character_Cursor : constant
VSS.Implementation.Strings.Cursor :=
(Index => 0, UTF8_Offset => -1, UTF16_Offset => -1);
After_Last_Character_Cursor : constant
VSS.Implementation.Strings.Cursor :=
(Index => 1, UTF8_Offset => 0, UTF16_Offset => 0);
-- These are only two possible positions of the cursor for null string.
--------------------------
-- After_Last_Character --
--------------------------
overriding procedure After_Last_Character
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor) is
begin
Position := After_Last_Character_Cursor;
end After_Last_Character;
------------
-- Append --
------------
overriding procedure Append
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data;
Code : VSS.Unicode.Code_Point;
Offset : in out VSS.Implementation.Strings.Cursor_Offset) is
begin
VSS.Implementation.String_Configuration.In_Place_Handler.Initialize
(Data);
VSS.Implementation.Strings.Handler (Data).Append (Data, Code, Offset);
end Append;
------------
-- Append --
------------
overriding procedure Append
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data;
Suffix : VSS.Implementation.Strings.String_Data;
Offset : in out VSS.Implementation.Strings.Cursor_Offset) is
begin
-- Append to a null string, just copy data.
Data := Suffix;
VSS.Implementation.Strings.Handler (Data).Reference (Data);
end Append;
--------------
-- Backward --
--------------
overriding function Backward
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor) return Boolean is
begin
if Position = After_Last_Character_Cursor then
Position := Before_First_Character_Cursor;
end if;
return False;
end Backward;
----------------------------
-- Before_First_Character --
----------------------------
overriding procedure Before_First_Character
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor)
is
begin
Position := Before_First_Character_Cursor;
end Before_First_Character;
------------
-- Delete --
------------
overriding procedure Delete
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data;
From : VSS.Implementation.Strings.Cursor;
Size : VSS.Implementation.Strings.Cursor_Offset) is null;
-------------
-- Element --
-------------
overriding function Element
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : VSS.Implementation.Strings.Cursor)
return VSS.Unicode.Code_Point'Base is
(VSS.Implementation.Strings.No_Character);
---------------
-- Ends_With --
---------------
overriding function Ends_With
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Suffix_Handler :
VSS.Implementation.String_Handlers.Abstract_String_Handler'Class;
Suffix_Data : VSS.Implementation.Strings.String_Data)
return Boolean is
begin
return Suffix_Handler.Is_Empty (Suffix_Data);
end Ends_With;
-------------
-- Forward --
-------------
overriding function Forward
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor) return Boolean is
begin
if Position = Before_First_Character_Cursor then
Position := After_Last_Character_Cursor;
end if;
return False;
end Forward;
-----------------------
-- From_UTF_8_String --
-----------------------
overriding procedure From_UTF_8_String
(Self : in out Null_String_Handler;
Item : Ada.Strings.UTF_Encoding.UTF_8_String;
Data : out VSS.Implementation.Strings.String_Data;
Success : out Boolean)
is
pragma Unreferenced (Data);
begin
-- XXX Should this subprogram do string conversion usign both ip-place
-- and default string handlers?
Success := False;
end From_UTF_8_String;
---------------------------
-- From_Wide_Wide_String --
---------------------------
overriding procedure From_Wide_Wide_String
(Self : in out Null_String_Handler;
Item : Wide_Wide_String;
Data : out VSS.Implementation.Strings.String_Data;
Success : out Boolean)
is
pragma Unreferenced (Data);
begin
-- XXX Should this subprogram do string conversion usign both ip-place
-- and default string handlers?
Success := False;
end From_Wide_Wide_String;
-------------------
-- Has_Character --
-------------------
overriding function Has_Character
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : VSS.Implementation.Strings.Cursor) return Boolean is (False);
----------
-- Hash --
----------
overriding procedure Hash
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Generator : in out VSS.Implementation.FNV_Hash.FNV_1a_Generator) is null;
------------
-- Insert --
------------
overriding procedure Insert
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data;
From : VSS.Implementation.Strings.Cursor;
Item : VSS.Unicode.Code_Point;
Offset : in out VSS.Implementation.Strings.Cursor_Offset) is
begin
VSS.Implementation.String_Configuration.In_Place_Handler.Initialize
(Data);
VSS.Implementation.Strings.Handler
(Data).Insert (Data, From, Item, Offset);
end Insert;
----------------
-- Initialize --
----------------
overriding procedure Initialize
(Self : Null_String_Handler;
Data : out VSS.Implementation.Strings.String_Data) is null;
--------------
-- Is_Empty --
--------------
overriding function Is_Empty
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data) return Boolean is (True);
-------------
-- Is_Null --
-------------
overriding function Is_Null
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data) return Boolean is (True);
------------
-- Length --
------------
overriding function Length
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data)
return VSS.Implementation.Strings.Character_Count is (0);
---------------
-- Reference --
---------------
overriding procedure Reference
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data) is null;
-----------------
-- Split_Lines --
-----------------
overriding procedure Split_Lines
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Terminators : VSS.Strings.Line_Terminator_Set;
Keep_Terminator : Boolean;
Lines : in out
VSS.Implementation.String_Vectors.String_Vector_Data_Access) is
begin
Lines := null;
end Split_Lines;
-----------------
-- Starts_With --
-----------------
overriding function Starts_With
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Prefix_Handler :
VSS.Implementation.String_Handlers.Abstract_String_Handler'Class;
Prefix_Data : VSS.Implementation.Strings.String_Data)
return Boolean is
begin
return Prefix_Handler.Is_Empty (Prefix_Data);
end Starts_With;
---------------------
-- To_UTF_8_String --
---------------------
overriding function To_UTF_8_String
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data)
return Ada.Strings.UTF_Encoding.UTF_8_String is ("");
-----------------
-- Unreference --
-----------------
overriding procedure Unreference
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data) is null;
end VSS.Implementation.Null_String_Handlers;
|