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252 | --
-- Copyright (C) 2021-2023, AdaCore
--
-- SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
--
-- Special case of string handler to process null strings.
--
-- All subprograms of String_Handler must be overridden and all necessary
-- preconditions is added.
with Ada.Strings.UTF_Encoding;
with VSS.Implementation.FNV_Hash;
with VSS.Implementation.String_Handlers;
with VSS.Implementation.String_Vectors;
with VSS.Implementation.Strings;
with VSS.Strings;
with VSS.Unicode;
package VSS.Implementation.Null_String_Handlers is
pragma Preelaborate;
use type VSS.Implementation.Strings.String_Handler_Access;
type Null_String_Handler is
new VSS.Implementation.String_Handlers.Abstract_String_Handler
with null record;
overriding procedure Reference
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding procedure Unreference
(Self : Null_String_Handler;
Data : in out VSS.Implementation.Strings.String_Data)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding procedure Initialize
(Self : Null_String_Handler;
Data : out VSS.Implementation.Strings.String_Data)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Is_Empty
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data) return Boolean
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Is_Null
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data) return Boolean
with Pre => not Data.In_Place and then Data.Handler = null;
overriding procedure Hash
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Generator : in out VSS.Implementation.FNV_Hash.FNV_1a_Generator)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Length
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data)
return VSS.Implementation.Strings.Character_Count
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Element
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : VSS.Implementation.Strings.Cursor)
return VSS.Unicode.Code_Point'Base
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Has_Character
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : VSS.Implementation.Strings.Cursor) return Boolean
with Pre => not Data.In_Place and then Data.Handler = null;
overriding procedure Before_First_Character
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding procedure After_Last_Character
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Forward
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor) return Boolean
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function Backward
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data;
Position : in out VSS.Implementation.Strings.Cursor) return Boolean
with Pre => not Data.In_Place and then Data.Handler = null;
-- not overriding function Is_Equal
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Other : Abstract_String_Handler'Class;
-- Other_Data : VSS.Implementation.Strings.String_Data) return Boolean;
-- not overriding function Is_Less
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Other : Abstract_String_Handler'Class;
-- Other_Data : VSS.Implementation.Strings.String_Data) return Boolean;
-- not overriding function Is_Less_Or_Equal
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Other : Abstract_String_Handler'Class;
-- Other_Data : VSS.Implementation.Strings.String_Data) return Boolean;
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
with Pre => not Data.In_Place and then Data.Handler = null;
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
with Pre => not Data.In_Place and then Data.Handler = null;
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)
with Pre => not Data.In_Place and then Data.Handler = null;
-- Convert Wide_Wide_String into internal representation.
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)
with Pre => not Data.In_Place and then Data.Handler = null;
overriding function To_UTF_8_String
(Self : Null_String_Handler;
Data : VSS.Implementation.Strings.String_Data)
return Ada.Strings.UTF_Encoding.UTF_8_String
with Pre => not Data.In_Place and then Data.Handler = null;
-- not overriding function First_UTF8_Offset
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Position : VSS.Implementation.Strings.Cursor)
-- return VSS.Unicode.UTF8_Code_Unit_Index;
--
-- not overriding function Last_UTF8_Offset
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Position : VSS.Implementation.Strings.Cursor)
-- return VSS.Unicode.UTF8_Code_Unit_Index;
--
-- not overriding function First_UTF16_Offset
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Position : VSS.Implementation.Strings.Cursor)
-- return VSS.Unicode.UTF16_Code_Unit_Index;
--
-- not overriding function Last_UTF16_Offset
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- Position : VSS.Implementation.Strings.Cursor)
-- return VSS.Unicode.UTF16_Code_Unit_Index;
-- -- Return offset of the last UTF-16 code unit at the given position.
--
-- not overriding procedure Compute_Size
-- (Self : Abstract_String_Handler;
-- Data : VSS.Implementation.Strings.String_Data;
-- From : VSS.Implementation.Strings.Cursor;
-- To : VSS.Implementation.Strings.Cursor;
-- Size : out VSS.Implementation.Strings.Cursor_Offset);
-- -- Compute size of the given segment. All components of Size have valid
-- -- and positive values.
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)
with Pre => not Data.In_Place and then Data.Handler = null;
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)
with Pre => not Data.In_Place and then Data.Handler = null;
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)
with Pre => not Data.In_Place and then Data.Handler = null;
-- not overriding procedure Insert
-- (Self : Abstract_String_Handler;
-- Data : in out VSS.Implementation.Strings.String_Data;
-- From : VSS.Implementation.Strings.Cursor;
-- Item : VSS.Implementation.Strings.String_Data;
-- Offset : in out VSS.Implementation.Strings.Cursor_Offset);
-- -- Insert string into the string.
-- --
-- -- Implementation must increment value of the Offset.
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)
with Pre => not Data.In_Place and then Data.Handler = null;
-- not overriding procedure Slice
-- (Self : Abstract_String_Handler;
-- Source : VSS.Implementation.Strings.String_Data;
-- From : VSS.Implementation.Strings.Cursor;
-- To : VSS.Implementation.Strings.Cursor;
-- Target : out VSS.Implementation.Strings.String_Data);
-- -- Return slice of the string.
-- -- Default implementation construct slice by processing individual
-- -- characters.
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)
with Pre => not Data.In_Place and then Data.Handler = null;
Global_Null_String_Handler : aliased Null_String_Handler;
end VSS.Implementation.Null_String_Handlers;
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