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213 | ------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- ADA.STRINGS.TEXT_BUFFERS.UNBOUNDED --
-- --
-- B o d y --
-- --
-- Copyright (C) 2020-2023, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Ada.Characters.Handling;
with Ada.Unchecked_Deallocation;
with Ada.Strings.UTF_Encoding.Conversions;
with Ada.Strings.UTF_Encoding.Strings;
with Ada.Strings.UTF_Encoding.Wide_Strings;
with Ada.Strings.UTF_Encoding.Wide_Wide_Strings;
package body Ada.Strings.Text_Buffers.Unbounded is
function Get (Buffer : in out Buffer_Type) return String is
-- If all characters are 7 bits, we don't need to decode;
-- this is an optimization.
-- Otherwise, if all are 8 bits, we need to decode to get Latin-1.
-- Otherwise, the result is implementation defined, so we return a
-- String encoded as UTF-8. Note that the RM says "if any character
-- in the sequence is not defined in Character, the result is
-- implementation-defined", so we are not obliged to decode ANY
-- Latin-1 characters if ANY character is bigger than 8 bits.
begin
if Buffer.All_8_Bits and not Buffer.All_7_Bits then
return UTF_Encoding.Strings.Decode (Get_UTF_8 (Buffer));
else
return Get_UTF_8 (Buffer);
end if;
end Get;
function Wide_Get (Buffer : in out Buffer_Type) return Wide_String is
begin
return UTF_Encoding.Wide_Strings.Decode (Get_UTF_8 (Buffer));
end Wide_Get;
function Wide_Wide_Get (Buffer : in out Buffer_Type) return Wide_Wide_String
is
begin
return UTF_Encoding.Wide_Wide_Strings.Decode (Get_UTF_8 (Buffer));
end Wide_Wide_Get;
function Get_UTF_8
(Buffer : in out Buffer_Type) return UTF_Encoding.UTF_8_String
is
begin
return Result : UTF_Encoding.UTF_8_String (1 .. Buffer.UTF_8_Length) do
declare
Target_First : Positive := 1;
Ptr : Chunk_Access := Buffer.List.First_Chunk'Unchecked_Access;
Target_Last : Positive;
begin
while Ptr /= null loop
Target_Last := Target_First + Ptr.Chars'Length - 1;
if Target_Last <= Result'Last then
-- all of chunk is assigned to Result
Result (Target_First .. Target_Last) := Ptr.Chars;
Target_First := Target_First + Ptr.Chars'Length;
else
-- only part of (last) chunk is assigned to Result
declare
Final_Target : UTF_Encoding.UTF_8_String renames
Result (Target_First .. Result'Last);
begin
Final_Target := Ptr.Chars (1 .. Final_Target'Length);
end;
pragma Assert (Ptr.Next = null);
Target_First := Integer'Last;
end if;
Ptr := Ptr.Next;
end loop;
end;
-- Reset buffer to default initial value.
declare
Defaulted : Buffer_Type;
-- If this aggregate becomes illegal due to new field, don't
-- forget to add corresponding assignment statement below.
Dummy : array (1 .. 0) of Buffer_Type :=
[others =>
(Indentation => <>,
Indent_Pending => <>,
UTF_8_Length => <>,
UTF_8_Column => <>,
All_7_Bits => <>,
All_8_Bits => <>,
Trim_Leading_White_Spaces => <>,
List => <>,
Last_Used => <>)];
begin
Buffer.Indentation := Defaulted.Indentation;
Buffer.Indent_Pending := Defaulted.Indent_Pending;
Buffer.UTF_8_Length := Defaulted.UTF_8_Length;
Buffer.UTF_8_Column := Defaulted.UTF_8_Column;
Buffer.All_7_Bits := Defaulted.All_7_Bits;
Buffer.All_8_Bits := Defaulted.All_8_Bits;
Buffer.Last_Used := Defaulted.Last_Used;
Finalize (Buffer.List); -- free any allocated chunks
end;
end return;
end Get_UTF_8;
function Wide_Get_UTF_16
(Buffer : in out Buffer_Type) return UTF_Encoding.UTF_16_Wide_String
is
begin
return
UTF_Encoding.Conversions.Convert
(Get_UTF_8 (Buffer), Input_Scheme => UTF_Encoding.UTF_8);
end Wide_Get_UTF_16;
procedure Put_UTF_8_Implementation
(Buffer : in out Root_Buffer_Type'Class;
Item : UTF_Encoding.UTF_8_String)
is
procedure Buffer_Type_Implementation (Buffer : in out Buffer_Type);
-- View the passed-in Buffer parameter as being of type Buffer_Type,
-- not of type Root_Buffer_Type'Class.
procedure Buffer_Type_Implementation (Buffer : in out Buffer_Type) is
begin
for Char of Item loop
-- The Trim_Leading_Space flag, which can be set prior to calling
-- any of the Put operations, which will cause white space
-- characters to be discarded by any Put operation until a
-- non-white-space character is encountered, at which point
-- the flag will be reset.
if not Buffer.Trim_Leading_White_Spaces
or else not Characters.Handling.Is_Space (Char)
then
Buffer.All_7_Bits := @ and then Character'Pos (Char) < 128;
Buffer.Trim_Leading_White_Spaces := False;
if Buffer.Last_Used = Buffer.List.Current_Chunk.Length then
-- Current chunk is full; allocate a new one with doubled
-- size
declare
Cc : Chunk renames Buffer.List.Current_Chunk.all;
Max : constant Positive := Integer'Last / 2;
Length : constant Natural :=
Integer'Min (Max, 2 * Cc.Length);
begin
pragma Assert (Cc.Next = null);
Cc.Next := new Chunk (Length => Length);
Buffer.List.Current_Chunk := Cc.Next;
Buffer.Last_Used := 0;
end;
end if;
Buffer.UTF_8_Length := @ + 1;
Buffer.UTF_8_Column := @ + 1;
Buffer.Last_Used := @ + 1;
Buffer.List.Current_Chunk.Chars (Buffer.Last_Used) := Char;
end if;
end loop;
end Buffer_Type_Implementation;
begin
Buffer_Type_Implementation (Buffer_Type (Buffer));
end Put_UTF_8_Implementation;
procedure Initialize (List : in out Managed_Chunk_List) is
begin
List.Current_Chunk := List.First_Chunk'Unchecked_Access;
end Initialize;
procedure Finalize (List : in out Managed_Chunk_List) is
procedure Free is new Ada.Unchecked_Deallocation (Chunk, Chunk_Access);
Ptr : Chunk_Access := List.First_Chunk.Next;
begin
while Ptr /= null loop
declare
Old_Ptr : Chunk_Access := Ptr;
begin
Ptr := Ptr.Next;
Free (Old_Ptr);
end;
end loop;
List.First_Chunk.Next := null;
Initialize (List);
end Finalize;
end Ada.Strings.Text_Buffers.Unbounded;
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