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273 | --
-- Copyright (C) 2020-2022, AdaCore
--
-- SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
--
with Ada.Unchecked_Deallocation;
package body VSS.Stream_Element_Vectors is
use type Ada.Streams.Stream_Element_Count;
procedure Free is
new Ada.Unchecked_Deallocation (Data_Record, Data_Access);
---------
-- "=" --
---------
overriding function "="
(Left : Stream_Element_Vector;
Right : Stream_Element_Vector) return Boolean
is
use type Ada.Streams.Stream_Element_Array;
begin
return
Left.Data = Right.Data
or else (Left.Data /= null and then Right.Data /= null
and then Left.Data.Length = Right.Data.Length
and then Left.Data.Storage (1 .. Left.Data.Length)
= Right.Data.Storage (1 .. Right.Data.Length));
end "=";
------------
-- Adjust --
------------
overriding procedure Adjust (Self : in out Stream_Element_Vector) is
Source : constant Data_Access := Self.Data;
begin
if Source /= null then
Self.Data :=
new Data_Record
(Ada.Streams.Stream_Element_Offset'Max
(Source.Size, Self.Capacity));
Self.Data.Length := Source.Length;
Self.Data.Storage (Source.Storage'Range) := Source.Storage;
end if;
end Adjust;
------------
-- Append --
------------
procedure Append
(Self : in out Stream_Element_Vector'Class;
Item : Ada.Streams.Stream_Element)
is
Source : Data_Access := Self.Data;
begin
if Self.Data = null then
Self.Data := new Data_Record (1);
Self.Data.Length := 0;
elsif Self.Data.Size <= Self.Data.Length then
Self.Data :=
new Data_Record
(Ada.Streams.Stream_Element_Offset'Max
(Source.Size * 2, Self.Capacity));
Self.Data.Length := Source.Length;
Self.Data.Storage (Source.Storage'Range) := Source.Storage;
Free (Source);
end if;
Self.Data.Length := Self.Data.Length + 1;
Self.Data.Storage (Self.Data.Length) := Item;
end Append;
------------
-- Append --
------------
procedure Append
(Self : in out Stream_Element_Vector'Class;
Item : Stream_Element_Vector'Class)
is
Prefix : Data_Access := Self.Data;
Suffix : constant Data_Access := Item.Data;
begin
if Suffix = null or else Suffix.Length = 0 then
return;
end if;
if Prefix = null then
Self.Data :=
new Data_Record
(Ada.Streams.Stream_Element_Offset'Max
(Suffix.Size, Self.Capacity));
Self.Data.Length := Suffix.Length;
Self.Data.Storage (Suffix.Storage'Range) := Suffix.Storage;
else
Self.Data :=
new Data_Record
(Ada.Streams.Stream_Element_Offset'Max
(Prefix.Length + Item.Length, Self.Capacity));
Self.Data.Length := Prefix.Length + Item.Length;
Self.Data.Storage (1 .. Prefix.Length) :=
Prefix.Storage (1 .. Prefix.Length);
Self.Data.Storage (Prefix.Length + 1 .. Self.Data.Length) :=
Item.Data.Storage (1 .. Item.Data.Length);
Free (Prefix);
end if;
end Append;
-------------
-- Element --
-------------
function Element
(Self : Stream_Element_Vector'Class;
Index : Ada.Streams.Stream_Element_Count)
return Ada.Streams.Stream_Element is
begin
if Self.Data = null or else Self.Data.Length < Index then
raise Constraint_Error;
end if;
return Self.Data.Storage (Index);
end Element;
-------------
-- Element --
-------------
function Element
(Self : Stream_Element_Vector'Class;
Position : Cursor) return Ada.Streams.Stream_Element is
begin
return Self.Element (Position.Index);
end Element;
--------------
-- Finalize --
--------------
overriding procedure Finalize (Self : in out Stream_Element_Vector) is
begin
if Self.Data /= null then
Free (Self.Data);
end if;
end Finalize;
function Has_Element (Self : Cursor) return Boolean is (Self.Index > 0);
-----------
-- First --
-----------
overriding function First
(Self : Reversible_Iterator) return Cursor is
begin
return (Index => (if Self.Last > 0 then 1 else 0));
end First;
--------------
-- Is_Empty --
--------------
function Is_Empty (Self : Stream_Element_Vector'Class) return Boolean is
begin
return Self.Data = null or else Self.Data.Length = 0;
end Is_Empty;
-------------
-- Iterate --
-------------
function Iterate
(Self : Stream_Element_Vector'Class) return Reversible_Iterator is
begin
return (Last => Self.Length);
end Iterate;
----------
-- Last --
----------
overriding function Last (Self : Reversible_Iterator) return Cursor is
begin
return (Index => Self.Last);
end Last;
------------
-- Length --
------------
function Length
(Self : Stream_Element_Vector'Class)
return Ada.Streams.Stream_Element_Count is
begin
return (if Self.Data = null then 0 else Self.Data.Length);
end Length;
----------
-- Next --
----------
overriding function Next
(Self : Reversible_Iterator;
Position : Cursor) return Cursor
is
Index : constant Ada.Streams.Stream_Element_Count :=
(if Position.Index < Self.Last then Position.Index + 1 else 0);
begin
return (Index => Index);
end Next;
--------------
-- Previous --
--------------
overriding function Previous
(Self : Reversible_Iterator;
Position : Cursor) return Cursor
is
pragma Unreferenced (Self);
begin
return (Index => (if Position.Index > 0 then Position.Index - 1 else 0));
end Previous;
----------
-- Read --
----------
procedure Read
(Stream : not null access Ada.Streams.Root_Stream_Type'Class;
Item : out Stream_Element_Vector) is
begin
null;
end Read;
------------------
-- Set_Capacity --
------------------
procedure Set_Capacity
(Self : in out Stream_Element_Vector'Class;
Capacity : Ada.Streams.Stream_Element_Count) is
begin
Self.Capacity := Capacity;
end Set_Capacity;
-----------
-- Write --
-----------
procedure Write
(Stream : not null access Ada.Streams.Root_Stream_Type'Class;
Item : Stream_Element_Vector) is
begin
if Item.Data /= null then
Ada.Streams.Stream_Element_Array'Write
(Stream, Item.Data.Storage (1 .. Item.Data.Length));
end if;
end Write;
end VSS.Stream_Element_Vectors;
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