/usr/share/ada/adainclude/texttools/gen_list.adb is in libtexttools3-dev 2.0.7-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- GEN LIST (package body) --
-- --
-- Part of TextTools --
-- Designed and Programmed by Ken O. Burtch --
-- --
------------------------------------------------------------------------------
-- --
-- Copyright (C) 1999-2007 Ken O. Burtch --
-- --
-- This 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 2, or (at your option) any later ver- --
-- sion. This 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with this; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- This is maintained at http://www.pegasoft.ca/tt.html --
-- --
------------------------------------------------------------------------------
-- Started September 5/95 by Ken O. Burtch
--
-- Package Body Notes:
--
-- 1. I avoid pragma Inline in order to keep the code compact. Where
-- I could have used Inline, it was usually better to insert optimzed
-- code to do the same (eg. Push/Pull).
package body gen_list is
NullList : constant List := (null,null,0,null,0,null);
RecordsAllocated : AListIndex := 0;
procedure GetAllocation( allocation : out AListIndex ) is
-- return number of outstanding records allocated
begin
allocation := RecordsAllocated * (AListElement'size / 8);
end GetAllocation;
function MemoryLeak( allocation : in AListIndex ) return boolean is
-- note if memory leakage has occurred between allocation time & now
begin
return ( RecordsAllocated * ( AListElement'size / 8 )) /= Allocation;
end MemoryLeak;
procedure Compact( TheList : in out List ) is
-- optimize the list
begin
if TheList.FreeCache /= null then
Free( TheList.FreeCache );
end if;
end Compact;
procedure Clear( TheList : in out List ) is
-- erase the entire list
TmpPtr, TmpPtr2 : AListRecordPtr;
begin
TmpPtr := TheList.First;
while TmpPtr /= null loop
TmpPtr2 := TmpPtr.next;
Free( TmpPtr );
RecordsAllocated := RecordsAllocated - 1;
TmpPtr := TmpPtr2;
end loop;
if TheList.FreeCache /= null then
Free( TheList.FreeCache );
RecordsAllocated := RecordsAllocated - 1; -- compensate for one not d'ed.
end if;
TheList := NullList;
end Clear;
function Length( TheList : in List ) return AListIndex is
-- return the length of the list
begin
return TheList.count;
end Length;
function IsEmpty( TheList : in List ) return boolean is
-- could check count, but this is more absolute
begin
return TheList.First = null;
end IsEmpty;
procedure Push( TheList : in out List; newdata : AListElement ) is
-- add a record to the start of the list & update the count
TmpPtr : AListRecordPtr;
begin
if TheList.FreeCache = null then -- allocate a new record
TmpPtr := new AListRecord;
RecordsAllocated := RecordsAllocated + 1;
else
TmpPtr := TheList.FreeCache; -- or grab one from the cache
TheList.FreeCache := null;
end if;
TmpPtr.Data := newdata; -- put data in it
if TheList.First = null then -- add to an empty list
TheList.First := TmpPtr;
TheList.Last := TmpPtr;
TmpPtr.Next := null;
else
TmpPtr.next := TheList.first; -- push it
TheList.first := TmpPtr;
end if;
TheList.count := TheList.count + 1; -- adjust the count
if TheList.LastPtr /= null then
TheList.LastRec := TheList.LastRec + 1;
end if;
end Push;
procedure Queue( TheList : in out List ; Data : AListElement ) is
-- add a record to the end of the list & update the count
TmpPtr : AListRecordPtr;
begin
if TheList.FreeCache = null then -- allocate a new record
TmpPtr := new AListRecord;
RecordsAllocated := RecordsAllocated + 1;
else
TmpPtr := TheList.FreeCache; -- or grab one from the cache
TheList.FreeCache := null;
end if;
TmpPtr.Data := Data; -- assign data
TmpPtr.Next := null; -- nothing will be after it
if TheList.First = null then -- add to an empty list
TheList.First := TmpPtr;
else
TheList.Last.Next := TmpPtr; -- or append to the end
end if;
TheList.Last := TmpPtr; -- always the last record
TheList.Count := TheList.Count + 1; -- add one to the count
end Queue;
procedure Insert( TheList : in out List ; Data : AListElement ) is
-- insert a record into the list in ascending order & update the count
NewRec : AListRecordPtr;
TmpPtr, TmpPtr2 : AListRecordPtr;
begin
TmpPtr2 := null; -- ready to search the list
TmpPtr := TheList.First;
while TmpPtr /= null loop -- quit if we reach the end
exit when TmpPtr.Data >= Data; -- or if we exceed the sort value
TmpPtr2 := TmpPtr;
TmpPtr := TmpPtr.Next;
end loop;
if TmpPtr = null then -- queue it if we reached the end
Queue( TheList, Data );
elsif TmpPtr2 = null then -- or push it if goes in front
Push( TheList, Data );
else
if TheList.FreeCache = null then -- else allocate a new record
NewRec := new AListRecord;
RecordsAllocated := RecordsAllocated + 1;
else
NewRec := TheList.FreeCache; -- or grab one from the cache
TheList.FreeCache := null;
end if;
NewRec.Data := Data; -- copy data
NewRec.Next := TmpPtr; -- goes before TmpPtr
TmpPtr2.next := NewRec; -- and after TmpPtr2
TheList.Count := TheList.Count + 1; -- update the count
TheList.LastPtr := null; -- last position cache
end if;
end Insert;
procedure Insert( TheList : in out List ; atIndex : AListIndex;
data : AListElement ) is
-- insert a record into the list at the index & update the count
NewRec : AListRecordPtr;
TmpPtr, TmpPtr2 : AListRecordPtr;
Count : AListIndex;
begin
if atIndex > 0 and atIndex <= TheList.Count then
Count := 0; -- get ready to search list
TmpPtr2 := null;
TmpPtr := TheList.First;
while TmpPtr /= null loop -- stop when we hit the end
Count := Count + 1;
exit when Count = atIndex; -- or when we hit the desired record
TmpPtr2 := TmpPtr;
TmpPtr := TmpPtr.Next;
end loop;
-- note: TmpPtr should NOT be null because of constraint check above
if TmpPtr2 = null then -- or push it if goes in front
Push( TheList, Data );
else
if TheList.FreeCache = null then -- else allocate a new record
NewRec := new AListRecord;
RecordsAllocated := RecordsAllocated + 1;
else
NewRec := TheList.FreeCache; -- or grab one from the cache
TheList.FreeCache := null;
end if;
NewRec.Data := Data; -- copy data
NewRec.Next := TmpPtr; -- goes before TmpPtr
TmpPtr2.next := NewRec; -- and after TmpPtr2
TheList.Count := TheList.Count + 1; -- update the count
TheList.LastRec := atIndex;
TheList.LastPtr := NewRec;
end if;
end if;
end Insert;
procedure Pull( TheList : in out List ; Data : in out AListElement ) is
-- remove a record from the front of the list & update the count
TmpPtr : AListRecordPtr;
begin
if TheList.first /= null then -- if the list isn't empty
TmpPtr := TheList.First; -- extract the data
Data := TheList.First.Data;
TheList.first := TheList.First.Next; -- update first pointer
if TheList.FreeCache = null then -- add record to free cache
TheList.FreeCache := TmpPtr;
else
Free( TmpPtr ); -- or deallocate if cache full
RecordsAllocated := RecordsAllocated - 1;
end if;
if TheList.First = null then -- if last record, fix last
TheList.Last := null;
end if;
TheList.Count := TheList.Count - 1; -- decrement the count
TheList.LastPtr := null; -- assuming the worst
end if;
end Pull;
procedure Pull( TheList : in out List ) is
-- remove a record from the front of the list and discard it
data : AListElement;
begin
Pull( TheList, Data );
end Pull;
procedure Concat( List1, List2 : List; Result : in out List ) is
-- add to lists together and return the results as a third list
-- not very fast -- could rewrite to get rid of queue's
TmpPtr : AListRecordPtr;
TmpList : List;
begin
TmpPtr := List1.First; -- move though first list
while TmpPtr /= null loop
Queue( TmpList, TmpPtr.Data ); -- add to result list
TmpPtr := TmpPtr.Next;
end loop;
TmpPtr := List2.First; -- move through second list
while TmpPtr /= null loop
Queue( TmpList, TmpPtr.Data ); -- add to result list
TmpPtr := TmpPtr.Next;
end loop;
Clear( Result ); -- overwrite result
Result := TmpList; -- with new header info
end Concat;
procedure Cut( TheList : in out List ; atIndex : AListIndex;
data : in out AListElement ) is
-- remove the atIndex-th record from the list and return it
Count : AListIndex;
TmpPtr, TmpPtr2 : AListRecordPtr;
begin
if atIndex > 0 and atIndex <= TheList.Count then
Count := 0; -- get ready to search list
TmpPtr2 := null;
TmpPtr := TheList.First;
while TmpPtr /= null loop -- stop when we hit the end
Count := Count + 1;
exit when Count = atIndex; -- or when we hit the desired record
TmpPtr2 := TmpPtr;
TmpPtr := TmpPtr.Next;
end loop;
-- note: TmpPtr should NOT be null because of constraint check above
data := TmpPtr.data; -- return the data
if TmpPtr2 = null then -- if it's the first then pull
Pull( TheList );
else
TmpPtr2.Next := TmpPtr.Next; -- else, next follows last one
if TmpPtr2.Next = null then -- update last if is the last
TheList.Last := TmpPtr2;
end if;
if TheList.FreeCache = null then -- add to the cache
TheList.FreeCache := TmpPtr;
else
Free( TmpPtr ); -- or discard if cache is full
RecordsAllocated := RecordsAllocated - 1;
end if;
TheList.Count := TheList.Count - 1; -- smaller by 1
TheList.LastPtr := null; -- assuming the worst
end if;
end if;
end Cut;
procedure Clear( TheList : in out List; atIndex : AListIndex ) is
Discard : AListElement;
begin
Cut( TheList, atIndex, Discard );
end Clear;
procedure Replace( TheList : in out List ; atIndex : AListIndex ;
Data : AListElement ) is
-- replaces the atIndex-th record from the list
Count : AListIndex;
TmpPtr : AListRecordPtr;
begin
if atIndex > 0 and atIndex <= TheList.Count then
if TheList.LastPtr /= null and then atIndex >= TheList.LastRec then
TmpPtr := TheList.LastPtr; -- use LastPtr if useful
Count := TheList.LastRec-1; -- (count inc'd below)
else
Count := 0; -- start from scratch
TmpPtr := TheList.First;
end if;
while TmpPtr /= null loop
Count := Count + 1;
exit when Count = atIndex;
TmpPtr := TmpPtr.Next;
end loop;
-- note: TmpPtr should NOT be null because of constraint check above
TmpPtr.Data := Data;
end if;
end Replace;
procedure Find( TheList : in out List ; atIndex : AListIndex ;
Data : in out AListElement ) is
-- finds the atIndex-th record from the list
Count : AListIndex;
TmpPtr : AListRecordPtr;
begin
if atIndex > 0 and atIndex <= TheList.Count then
-- was <=
if TheList.LastPtr /= null and then atIndex >= TheList.LastRec then
Count := TheList.LastRec-1; -- use Lastptr if helpful
TmpPtr := TheList.LastPtr; -- (count is inc'd below)
else
Count := 0; -- else start from scratch
TmpPtr := TheList.first;
end if;
while TmpPtr /= null loop
Count := Count + 1;
exit when Count = atIndex;
TmpPtr := TmpPtr.next;
end loop;
-- note: TmpPtr should NOT be null because of constraint check above
data := TmpPtr.data;
TheList.LastRec := atIndex; -- last access point
TheList.LastPtr := TmpPtr;
end if;
end Find;
procedure Find( TheList : in out List ; data : AListElement;
start : AListIndex := 1; FoundAt : in out AListIndex ) is
-- locate the first (next) record matching c and return it's index
Count : AListIndex;
TmpPtr : AListRecordPtr;
begin
if start > 0 and start <= TheList.Count then
if TheList.LastPtr /= null and then start >= TheList.LastRec then
Count := TheList.LastRec-1; -- (Count is inc'd below)
TmpPtr := TheList.LastPtr; -- use LastPtr if it's useful
else
Count := 0; -- else start from scratch
TmpPtr := TheList.first;
end if;
while TmpPtr /= null loop
Count := Count + 1;
exit when (TmpPtr.Data = Data) and then (Count >= Start);
TmpPtr := TmpPtr.next;
end loop;
if TmpPtr = null then
Count := 0;
else
TheList.LastRec := Count; -- remember where we left off
TheList.LastPtr := TmpPtr;
end if;
FoundAt := Count;
else -- wierd start or empty list
FoundAt := 0;
end if;
end Find;
procedure SubList( TheList : in out List ; index, len : AListIndex;
result : in out List ) is
-- extract a sublist of length len from position index
Count : AListIndex;
TmpPtr : AListRecordPtr;
TmpList : List; -- in case TheList = Result
begin
if TheList.LastPtr /= null and index >= TheList.LastRec then
TmpPtr := TheList.LastPtr; -- use LastPtr if useful
Count := TheList.LastRec-1; -- (LastRec inc'd below)
else
Count := 0; -- else start from scratch
TmpPtr := TheList.First;
end if;
while TmpPtr /= null loop -- loop until we run out
Count := Count + 1;
exit when (Count >= Index); -- or we find the nth item
TmpPtr := TmpPtr.Next;
end loop;
if TmpPtr /= null then -- if we're still in the list
TheList.LastPtr := TmpPtr; -- record where we are
TheList.LastRec := Count; -- for future speed benefits
end if;
Count := 0; -- read to build sublist
while TmpPtr /= null loop -- loop until we run out
Queue( TmpList, TmpPtr.data ); -- should rewrite this for speed
Count := Count + 1;
exit when (Count >= len ); -- or stop when we have enough
TmpPtr := TmpPtr.Next;
end loop;
Clear( Result ); -- overwrite result
Result := TmpList; -- with new header info
end SubList;
procedure Copy( FromList, ToList : in out List ) is
-- Make a copy of the ToList
FromListPtr : AListRecordPtr;
TmpPtr : AListRecordPtr;
TmpList : List; -- FromList might be ToList
begin
FromListPtr := FromList.First; -- begin at the first record
if FromListPtr /= null then -- if there is a first record
TmpPtr := new AListRecord; -- add it to the new list
RecordsAllocated := RecordsAllocated + 1;
TmpPtr.data := FromListPtr.data;
TmpList.First := TmpPtr;
TmpList.Last := TmpPtr;
FromListPtr := FromListPtr.next; -- update pointer
while FromListPtr /= null loop -- for any remaining records
TmpPtr := new AListRecord; -- create a copy for first list
RecordsAllocated := RecordsAllocated + 1;
TmpPtr.data := FromListPtr.data;
TmpList.Last.Next := TmpPtr; -- and append it
TmpList.Last := TmpPtr;
FromListPtr := FromListPtr.Next; -- update pointer
end loop;
TmpList.Count := FromList.Count; -- fix counts and last.next pointers
TmpList.Last.Next := null;
Clear( ToList ); -- overwrite result
ToList := TmpList; -- with new header info
end if;
end Copy;
procedure Copy( FromList, ToList1, ToList2 : in out List ) is
-- Make two copies of the FromList
FromListPtr : AListRecordPtr;
TmpPtr : AListRecordptr;
List1, List2: List; -- ToList1 or ToList2 might be same as FromList
begin
FromListPtr := FromList.First; -- begin at the first record
if FromListPtr /= null then -- if there is a first record
TmpPtr := new AListRecord; -- add it to the first list
RecordsAllocated := RecordsAllocated + 1;
TmpPtr.data := FromListPtr.data;
List1.First := TmpPtr;
List1.Last := TmpPtr;
TmpPtr := new AListRecord; -- and to the second
RecordsAllocated := RecordsAllocated + 1;
TmpPtr.data := FromListPtr.data;
List2.First := TmpPtr;
List2.Last := TmpPtr;
FromListPtr := FromListPtr.next; -- update pointer
while FromListPtr /= null loop -- for any remaining records
TmpPtr := new AListRecord; -- create a copy for first list
RecordsAllocated := RecordsAllocated + 1;
TmpPtr.data := FromListPtr.data;
List1.Last.Next := TmpPtr; -- and append it
List1.Last := TmpPtr;
TmpPtr := new AListRecord; -- create a copy for second list
RecordsAllocated := RecordsAllocated + 1;
TmpPtr.data := FromListPtr.data;
List2.Last.Next := TmpPtr; -- and append it, too
List2.Last := TmpPtr;
FromListPtr := FromListPtr.Next; -- update pointer
end loop;
List1.Count := FromList.Count; -- fix counts and last.next pointers
List1.Last.Next := null;
List2.Count := FromList.Count;
List2.Last.Next := null;
Clear( ToList1 ); -- overwrite result lists
Clear( ToList2 );
ToList1 := List1; -- with new header info
ToList2 := List2;
end if;
end Copy;
procedure Move( FromList, ToList : in out List ) is
-- move a list between two list variables
begin
if FromList.first /= ToList.first then
Clear( ToList );
ToList := FromList;
FromList := NullList;
end if;
end Move;
procedure Swap( List1, List2 : in out List ) is
TmpList : List;
begin
if List1.first /= List2.first then
Move( FromList => List1, ToList => TmpList );
Move( FromList => List2, ToList => List1 );
Move( FromList => TmpList, ToList => List2 );
end if;
end Swap;
end gen_list;
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