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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . A R R A Y _ S P L I T --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2022, 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.Unchecked_Deallocation;
package body GNAT.Array_Split is
procedure Free is
new Ada.Unchecked_Deallocation (Slices_Indexes, Slices_Access);
procedure Free is
new Ada.Unchecked_Deallocation (Separators_Indexes, Indexes_Access);
function Count
(Source : Element_Sequence;
Pattern : Element_Set) return Natural;
-- Returns the number of occurrences of Pattern elements in Source, 0 is
-- returned if no occurrence is found in Source.
------------
-- Adjust --
------------
overriding procedure Adjust (S : in out Slice_Set) is
begin
S.D.Ref_Counter := S.D.Ref_Counter + 1;
end Adjust;
------------
-- Create --
------------
procedure Create
(S : out Slice_Set;
From : Element_Sequence;
Separators : Element_Sequence;
Mode : Separator_Mode := Single)
is
begin
Create (S, From, To_Set (Separators), Mode);
end Create;
function Create
(From : Element_Sequence;
Separators : Element_Sequence;
Mode : Separator_Mode := Single) return Slice_Set is
begin
return Ret : Slice_Set do
Create (Ret, From, Separators, Mode);
end return;
end Create;
------------
-- Create --
------------
procedure Create
(S : out Slice_Set;
From : Element_Sequence;
Separators : Element_Set;
Mode : Separator_Mode := Single)
is
Result : Slice_Set;
begin
Result.D.Source := new Element_Sequence'(From);
Set (Result, Separators, Mode);
S := Result;
end Create;
function Create
(From : Element_Sequence;
Separators : Element_Set;
Mode : Separator_Mode := Single) return Slice_Set is
begin
return Ret : Slice_Set do
Create (Ret, From, Separators, Mode);
end return;
end Create;
-----------
-- Count --
-----------
function Count
(Source : Element_Sequence;
Pattern : Element_Set) return Natural
is
C : Natural := 0;
begin
for K in Source'Range loop
if Is_In (Source (K), Pattern) then
C := C + 1;
end if;
end loop;
return C;
end Count;
--------------
-- Finalize --
--------------
overriding procedure Finalize (S : in out Slice_Set) is
procedure Free is
new Ada.Unchecked_Deallocation (Element_Sequence, Element_Access);
procedure Free is
new Ada.Unchecked_Deallocation (Data, Data_Access);
D : Data_Access := S.D;
begin
-- Ensure call is idempotent
S.D := null;
if D /= null then
D.Ref_Counter := D.Ref_Counter - 1;
if D.Ref_Counter = 0 then
Free (D.Source);
Free (D.Indexes);
Free (D.Slices);
Free (D);
end if;
end if;
end Finalize;
----------------
-- Initialize --
----------------
overriding procedure Initialize (S : in out Slice_Set) is
begin
S.D := new Data'(1, null, 0, null, null);
end Initialize;
----------------
-- Separators --
----------------
function Separators
(S : Slice_Set;
Index : Slice_Number) return Slice_Separators
is
begin
if Index > S.D.N_Slice then
raise Index_Error;
elsif Index = 0
or else (Index = 1 and then S.D.N_Slice = 1)
then
-- Whole string, or no separator used
return [Before => Array_End,
After => Array_End];
elsif Index = 1 then
return [Before => Array_End,
After => S.D.Source (S.D.Slices (Index).Stop + 1)];
elsif Index = S.D.N_Slice then
return [Before => S.D.Source (S.D.Slices (Index).Start - 1),
After => Array_End];
else
return [Before => S.D.Source (S.D.Slices (Index).Start - 1),
After => S.D.Source (S.D.Slices (Index).Stop + 1)];
end if;
end Separators;
----------------
-- Separators --
----------------
function Separators (S : Slice_Set) return Separators_Indexes is
begin
return S.D.Indexes.all;
end Separators;
---------
-- Set --
---------
procedure Set
(S : in out Slice_Set;
Separators : Element_Sequence;
Mode : Separator_Mode := Single)
is
begin
Set (S, To_Set (Separators), Mode);
end Set;
---------
-- Set --
---------
procedure Set
(S : in out Slice_Set;
Separators : Element_Set;
Mode : Separator_Mode := Single)
is
procedure Copy_On_Write (S : in out Slice_Set);
-- Make a copy of S if shared with another variable
-------------------
-- Copy_On_Write --
-------------------
procedure Copy_On_Write (S : in out Slice_Set) is
begin
if S.D.Ref_Counter > 1 then
-- First let's remove our count from the current data
S.D.Ref_Counter := S.D.Ref_Counter - 1;
-- Then duplicate the data
S.D := new Data'(S.D.all);
S.D.Ref_Counter := 1;
if S.D.Source /= null then
S.D.Source := new Element_Sequence'(S.D.Source.all);
S.D.Indexes := null;
S.D.Slices := null;
end if;
else
-- If there is a single reference to this variable, free it now
-- as it will be redefined below.
Free (S.D.Indexes);
Free (S.D.Slices);
end if;
end Copy_On_Write;
Count_Sep : constant Natural := Count (S.D.Source.all, Separators);
J : Positive;
begin
Copy_On_Write (S);
-- Compute all separator's indexes
S.D.Indexes := new Separators_Indexes (1 .. Count_Sep);
J := S.D.Indexes'First;
for K in S.D.Source'Range loop
if Is_In (S.D.Source (K), Separators) then
S.D.Indexes (J) := K;
J := J + 1;
end if;
end loop;
-- Compute slice info for fast slice access
declare
S_Info : Slices_Indexes (1 .. Slice_Number (Count_Sep) + 1);
K : Natural := 1;
Start, Stop : Natural;
begin
S.D.N_Slice := 0;
Start := S.D.Source'First;
Stop := 0;
loop
if K > Count_Sep then
-- No more separators, last slice ends at end of source string
Stop := S.D.Source'Last;
else
Stop := S.D.Indexes (K) - 1;
end if;
-- Add slice to the table
S.D.N_Slice := S.D.N_Slice + 1;
S_Info (S.D.N_Slice) := (Start, Stop);
exit when K > Count_Sep;
case Mode is
when Single =>
-- In this mode just set start to character next to the
-- current separator, advance the separator index.
Start := S.D.Indexes (K) + 1;
K := K + 1;
when Multiple =>
-- In this mode skip separators following each other
loop
Start := S.D.Indexes (K) + 1;
K := K + 1;
exit when K > Count_Sep
or else S.D.Indexes (K) > S.D.Indexes (K - 1) + 1;
end loop;
end case;
end loop;
S.D.Slices := new Slices_Indexes'(S_Info (1 .. S.D.N_Slice));
end;
end Set;
-----------
-- Slice --
-----------
function Slice
(S : Slice_Set;
Index : Slice_Number) return Element_Sequence
is
begin
if Index = 0 then
return S.D.Source.all;
elsif Index > S.D.N_Slice then
raise Index_Error;
else
return
S.D.Source (S.D.Slices (Index).Start .. S.D.Slices (Index).Stop);
end if;
end Slice;
-----------------
-- Slice_Count --
-----------------
function Slice_Count (S : Slice_Set) return Slice_Number is
begin
return S.D.N_Slice;
end Slice_Count;
end GNAT.Array_Split;
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