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lsparray.pas
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lsparray.pas
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(*----------------------------------------------------------------------------*)
(* Array-Funktionen *)
(*----------------------------------------------------------------------------*)
(* Author: Joachim Pimiskern, 1994-2004 *)
(*----------------------------------------------------------------------------*)
unit lsparray;
{$O+,F+}
interface
uses
lspglobl;
function LspMakeArray(Size: pNode): pNode;
function LspAref(Feld,Index: pNode): pNode;
procedure LspSetAtIndex(Feld, Wert: pNode; Index: longint);
function LspGetAtIndex(Feld: pNode; Index: longint): pNode;
procedure LspSwapArrayVals(Feld: pNode; Index1, Index2: longint);
implementation
uses
Classes, Sysutils,
lsperr, lsppredi, lspmath, lspcreat;
(*----------------------------------------------------------------------------*)
(* Ein Array mit Size Knoten liefern. *)
(*----------------------------------------------------------------------------*)
function LspMakeArray(Size: pNode): pNode;
var s,i : longint;
empty: pNode;
begin
result := nil;
empty := nil;
if (not LspIntegerp(Size)) then
raise ELispException.Create('ErrIntegerExpected','');
s := LspGetIntegerVal(Size);
LspNew(result);
result^.Typ := cLspArray;
result^.Size := s;
result^.ArrayVal := TMemoryStream.Create;
for i := 0 to s - 1 do
result^.ArrayVal.Write(empty,sizeof(pNode));
end;
(*----------------------------------------------------------------------------*)
(* Auf den Inhalt des Feldes an einer bestimmten Stelle zugreifen *)
(*----------------------------------------------------------------------------*)
function LspAref(Feld,Index: pNode): pNode;
var i: longint;
begin
result := nil;
if (not LspArrayp(Feld)) then
raise ELispException.Create('ErrArrayExpected','First argument wrong');
if (not LspIntegerp(Index)) then
raise ELispException.Create('ErrIntegerExpected','Second argument wrong');
i := LspGetIntegerVal(Index);
if ((i < 0) or (i >= Feld^.Size)) then
raise ELispException.Create('ErrArrayIndexOutOfRange',IntToStr(i));
Feld^.ArrayVal.Seek(i * sizeof(pNode),0);
Feld^.ArrayVal.Read(Result, sizeof(pNode));
end;
(*----------------------------------------------------------------------------*)
(* Ein Element des Feldes mit einem Wert belegen *)
(*----------------------------------------------------------------------------*)
procedure LspSetAtIndex(Feld, Wert: pNode; Index: longint);
begin
if (not LspArrayp(Feld)) then
raise ELispException.Create('ErrArrayExpected','First argument');
if ((Index < 0) or (Index >= Feld^.Size)) then
raise ELispException.Create('ErrArrayIndexOutOfRange',IntToStr(Index));
Feld^.ArrayVal.Seek(Index * sizeof(pNode),0);
Feld^.ArrayVal.Write(Wert, sizeof(pNode));
end;
(*----------------------------------------------------------------------------*)
(* Den Wert des Feldes an einer bestimmten Stelle holen *)
(*----------------------------------------------------------------------------*)
function LspGetAtIndex(Feld: pNode; Index: longint): pNode;
begin
Result := nil;
if (not LspArrayp(Feld)) then
raise ELispException.Create('ErrArrayExpected','First argument');
if ((Index < 0) or (Index >= Feld^.Size)) then
raise ELispException.Create('ErrArrayIndexOutOfRange',IntToStr(Index));
Feld^.ArrayVal.Seek(Index * sizeof(pNode),0);
Feld^.ArrayVal.Read(Result, sizeof(pNode));
end;
(*----------------------------------------------------------------------------*)
(* Zwei Werte eines Feldes vertauschen *)
(*----------------------------------------------------------------------------*)
procedure LspSwapArrayVals(Feld: pNode; Index1, Index2: longint);
var Value1,Value2: pNode;
begin
if (not LspArrayp(Feld)) then
raise ELispException.Create('ErrArrayExpected','First argument');
if ((Index1 < 0) or (Index1 >= Feld^.Size)) then
raise ELispException.Create('ErrArrayIndexOutOfRange',IntToStr(Index1));
if ((Index2 < 0) or (Index2 >= Feld^.Size)) then
raise ELispException.Create('ErrArrayIndexOutOfRange',IntToStr(Index2));
Feld^.ArrayVal.Seek(Index1 * sizeof(pNode),0);
Feld^.ArrayVal.Read(Value1, sizeof(pNode));
Feld^.ArrayVal.Seek(Index2 * sizeof(pNode),0);
Feld^.ArrayVal.Read(Value2, sizeof(pNode));
Feld^.ArrayVal.Seek(Index1 * sizeof(pNode),0);
Feld^.ArrayVal.Write(Value2, sizeof(pNode));
Feld^.ArrayVal.Seek(Index2 * sizeof(pNode),0);
Feld^.ArrayVal.Write(Value1, sizeof(pNode));
end;
end.