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uPSPreProcessor.pas
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uPSPreProcessor.pas
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unit uPSPreProcessor;
{$I PascalScript.inc}
interface
uses
Classes, SysUtils, uPSCompiler, uPSUtils;
type
EPSPreProcessor = class(Exception); //- jgv
TPSPreProcessor = class;
TPSPascalPreProcessorParser = class;
TPSOnNeedFile = function (Sender: TPSPreProcessor; const callingfilename: tbtstring; var FileName, Output: tbtstring): Boolean;
{ Added by Wizzup }
TPSOnFileAlreadyIncluded = function (Sender: TPSPreProcessor; OrgFileName, FileName: tbtstring): Boolean;
TPSOnIncludingFile = function (Sender: TPSPreProcessor; OrgFileName, FileName: tbtstring): Boolean;
{ Wizzup out }
TPSOnProcessDirective = procedure (
Sender: TPSPreProcessor;
Parser: TPSPascalPreProcessorParser;
const Active: Boolean;
const DirectiveName, DirectiveParam: tbtString;
Var Continue: Boolean;
FileName: tbtString); //- jgv - application set continue to false to stop the normal directive processing
TPSLineInfo = class(TObject)
private
function GetLineOffset(I: Integer): Cardinal;
function GetLineOffsetCount: Longint;
protected
FEndPos: Cardinal;
FStartPos: Cardinal;
FFileName: tbtstring;
FLineOffsets: TIfList;
public
property FileName: tbtstring read FFileName;
property StartPos: Cardinal read FStartPos;
property EndPos: Cardinal read FEndPos;
property LineOffsetCount: Longint read GetLineOffsetCount;
property LineOffset[I: Longint]: Cardinal read GetLineOffset;
constructor Create;
destructor Destroy; override;
end;
TPSLineInfoResults = record
Row,
Col,
Pos: Cardinal;
Name: tbtstring;
end;
TPSLineInfoList = class(TObject)
private
FItems: TIfList;
FCurrent: Longint;
function GetCount: Longint;
function GetItem(I: Integer): TPSLineInfo;
protected
function Add: TPSLineInfo;
public
property Count: Longint read GetCount;
property Items[I: Longint]: TPSLineInfo read GetItem; default;
procedure Clear;
function GetLineInfo(const ModuleName: tbtstring; Pos: Cardinal; var Res: TPSLineInfoResults): Boolean;
property Current: Longint read FCurrent write FCurrent;
constructor Create;
destructor Destroy; override;
end;
TPSDefineStates = class;
TPSPreProcessor = class(TObject)
private
FID: Pointer;
FCurrentDefines, FDefines: TStringList;
FCurrentLineInfo: TPSLineInfoList;
FOnNeedFile: TPSOnNeedFile;
{ Added by Wizzup }
FOnFileAlreadyIncluded: TPSOnFileAlreadyIncluded;
FOnIncludingFile: TPSOnIncludingFile;
{ Wizzup out }
FAddedPosition: Cardinal;
FDefineState: TPSDefineStates;
FMaxLevel: Longint;
FMainFileName: tbtstring;
FMainFile: tbtstring;
FOnProcessDirective: TPSOnProcessDirective;
FOnProcessUnknowDirective: TPSOnProcessDirective;
procedure ParserNewLine(Sender: TPSPascalPreProcessorParser; Row, Col, Pos: Cardinal);
procedure IntPreProcess(Level: Integer; const OrgFileName: tbtstring; FileName: tbtstring; Dest: TStream);
protected
procedure doAddStdPredefines; virtual; // jgv
public
{The maximum number of levels deep the parser will go, defaults to 20}
property MaxLevel: Longint read FMaxLevel write FMaxLevel;
property CurrentLineInfo: TPSLineInfoList read FCurrentLineInfo;
property OnNeedFile: TPSOnNeedFile read FOnNeedFile write FOnNeedFile;
{ Added by Wizzup }
property OnFileAlreadyIncluded: TPSOnFileAlreadyIncluded read FOnFileAlreadyIncluded write FOnFileAlreadyIncluded;
property OnIncludingFile: TPSOnIncludingFile read FOnIncludingFile write FOnIncludingFile;
{ Wizzup out }
property Defines: TStringList read FDefines write FDefines;
property MainFile: tbtstring read FMainFile write FMainFile;
property MainFileName: tbtstring read FMainFileName write FMainFileName;
property ID: Pointer read FID write FID;
procedure AdjustMessages(Comp: TPSPascalCompiler);
procedure AdjustMessage(Msg: TPSPascalCompilerMessage); //-jgv
procedure PreProcess(const Filename: tbtstring; var Output: tbtstring);
procedure Clear;
constructor Create;
destructor Destroy; override;
property OnProcessDirective: TPSOnProcessDirective read fOnProcessDirective write fOnProcessDirective;
property OnProcessUnknowDirective: TPSOnProcessDirective read fOnProcessUnknowDirective write fOnProcessUnknowDirective;
end;
TPSPascalPreProcessorType = (ptEOF, ptOther, ptDefine);
TPSOnNewLine = procedure (Sender: TPSPascalPreProcessorParser; Row, Col, Pos: Cardinal) of object;
TPSPascalPreProcessorParser = class(TObject)
private
FData: tbtstring;
FText: PAnsichar;
FToken: tbtstring;
FTokenId: TPSPascalPreProcessorType;
FLastEnterPos, FLen, FRow, FCol, FPos: Cardinal;
FOnNewLine: TPSOnNewLine;
public
procedure SetText(const dta: tbtstring);
procedure Next;
property Token: tbtstring read FToken;
property TokenId: TPSPascalPreProcessorType read FTokenId;
property Row: Cardinal read FRow;
property Col: Cardinal read FCol;
property Pos: Cardinal read FPos;
property OnNewLine: TPSOnNewLine read FOnNewLine write FOnNewLine;
end;
TPSDefineState = class(TObject)
private
FInElse: Boolean;
FDoWrite: Boolean;
public
property InElse: Boolean read FInElse write FInElse;
property DoWrite: Boolean read FDoWrite write FDoWrite;
end;
TPSDefineStates = class(TObject)
private
FItems: TIfList;
function GetCount: Longint;
function GetItem(I: Integer): TPSDefineState;
function GetWrite: Boolean;
function GetPrevWrite: Boolean; //JeromeWelsh - nesting fix
public
property Count: Longint read GetCount;
property Item[I: Longint]: TPSDefineState read GetItem; default;
function Add: TPSDefineState;
procedure Delete(I: Longint);
constructor Create;
destructor Destroy; override;
procedure Clear;
property DoWrite: Boolean read GetWrite;
property DoPrevWrite: Boolean read GetPrevWrite; //JeromeWelsh - nesting fix
end;
implementation
{$IFDEF DELPHI3UP }
resourceString
{$ELSE }
const
{$ENDIF }
RPS_TooManyNestedInclude = 'Too many nested include files while processing ''%s'' from ''%s''';
RPS_IncludeNotFound = 'Unable to find file ''%s'' used from ''%s''';
{ Added by Wizzup }
RPS_IncludeOnceNotFound = 'Unable to check if file ''%s'' is already included, used from ''%s''';
{ Wizzup out }
RPS_DefineTooManyParameters = 'Too many parameters at %d:%d';
RPS_NoIfdefForEndif = 'No IFDEF for ENDIF at %d:%d';
RPS_NoIfdefForElse = 'No IFDEF for ELSE at %d:%d';
RPS_ElseTwice = 'Can''t use ELSE twice at %d:%d';
RPS_UnknownCompilerDirective = 'Unknown compiler directives at %d:%d';
RPs_DefineNotClosed = 'Define not closed';
{ TPSLineInfoList }
function TPSLineInfoList.Add: TPSLineInfo;
begin
Result := TPSLineInfo.Create;
FItems.Add(Result);
end;
procedure TPSLineInfoList.Clear;
var
i: Longint;
begin
for i := FItems.count -1 downto 0 do
TPSLineInfo(FItems[i]).Free;
FItems.Clear;
end;
constructor TPSLineInfoList.Create;
begin
inherited Create;
FItems := TIfList.Create;
end;
destructor TPSLineInfoList.Destroy;
begin
Clear;
FItems.Free;
inherited Destroy;
end;
function TPSLineInfoList.GetCount: Longint;
begin
Result := FItems.Count;
end;
function TPSLineInfoList.GetItem(I: Integer): TPSLineInfo;
begin
Result := TPSLineInfo(FItems[i]);
end;
function TPSLineInfoList.GetLineInfo(const ModuleName: tbtstring; Pos: Cardinal; var Res: TPSLineInfoResults): Boolean;
var
i,j: Longint;
linepos: Cardinal;
Item: TPSLineInfo;
lModuleName: tbtstring;
begin
lModuleName := FastUpperCase(ModuleName);
for i := FItems.Count -1 downto 0 do
begin
Item := FItems[i];
if (Pos >= Item.StartPos) and (Pos < Item.EndPos) and
(lModuleName = '') or (lModuleName = Item.FileName) then
begin
Res.Name := Item.FileName;
Pos := Pos - Item.StartPos;
Res.Pos := Pos;
Res.Col := 1;
Res.Row := 1;
LinePos := 0;
for j := 0 to Item.LineOffsetCount -1 do
begin
if Pos >= Item.LineOffset[j] then
begin
linepos := Item.LineOffset[j];
end else
begin
Res.Row := j; // j -1, but line counting starts at 1
Res.Col := pos - linepos + 1;
Break;
end;
end;
Result := True;
exit;
end;
end;
Result := False;
end;
{ TPSLineInfo }
constructor TPSLineInfo.Create;
begin
inherited Create;
FLineOffsets := TIfList.Create;
end;
destructor TPSLineInfo.Destroy;
begin
FLineOffsets.Free;
inherited Destroy;
end;
function TPSLineInfo.GetLineOffset(I: Integer): Cardinal;
begin
Result := Longint(FLineOffsets[I]);
end;
function TPSLineInfo.GetLineOffsetCount: Longint;
begin
result := FLineOffsets.Count;
end;
{ TPSPascalPreProcessorParser }
procedure TPSPascalPreProcessorParser.Next;
var
ci: Cardinal;
begin
FPos := FPos + FLen;
case FText[FPos] of
#0:
begin
FLen := 0;
FTokenId := ptEof;
end;
'''':
begin
ci := FPos;
while (FText[ci] <> #0) do
begin
Inc(ci);
while FText[ci] = '''' do
begin
if FText[ci+1] <> '''' then Break;
inc(ci);
inc(ci);
end;
if FText[ci] = '''' then Break;
if FText[ci] = #13 then
begin
inc(FRow);
if FText[ci] = #10 then
inc(ci);
FLastEnterPos := ci -1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end else if FText[ci] = #10 then
begin
inc(FRow);
FLastEnterPos := ci -1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end;
end;
FLen := ci - FPos + 1;
FTokenId := ptOther;
end;
'(':
begin
if FText[FPos + 1] = '*' then
begin
ci := FPos + 1;
while (FText[ci] <> #0) do begin
if (FText[ci] = '*') and (FText[ci + 1] = ')') then
Break;
if FText[ci] = #13 then
begin
inc(FRow);
if FText[ci+1] = #10 then
inc(ci);
FLastEnterPos := ci -1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end else if FText[ci] = #10 then
begin
inc(FRow);
FLastEnterPos := ci -1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end;
Inc(ci);
end;
FTokenId := ptOther;
if (FText[ci] <> #0) then
Inc(ci, 2);
FLen := ci - FPos;
end
else
begin
FTokenId := ptOther;
FLen := 1;
end;
end;
'/':
begin
if FText[FPos + 1] = '/' then
begin
ci := FPos + 1;
while (FText[ci] <> #0) and (FText[ci] <> #13) and
(FText[ci] <> #10) do begin
Inc(ci);
end;
FTokenId := ptOther;
FLen := ci - FPos;
end else
begin
FTokenId := ptOther;
FLen := 1;
end;
end;
'{':
begin
ci := FPos + 1;
while (FText[ci] <> #0) and (FText[ci] <> '}') do begin
if FText[ci] = #13 then
begin
inc(FRow);
if FText[ci+1] = #10 then
inc(ci);
FLastEnterPos := ci - 1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end else if FText[ci] = #10 then
begin
inc(FRow);
FLastEnterPos := ci - 1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end;
Inc(ci);
end;
if (FText[FPos + 1] = '$') or (FText[FPos + 1] = '.') then
FTokenId := ptDefine
else
FTokenId := ptOther;
FLen := ci - FPos + 1;
end;
else
begin
ci := FPos + 1;
while not (FText[ci] in [#0,'{', '(', '''', '/']) do
begin
if FText[ci] = #13 then
begin
inc(FRow);
if FText[ci+1] = #10 then
inc(ci);
FLastEnterPos := ci - 1;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end else if FText[ci] = #10 then
begin
inc(FRow);
FLastEnterPos := ci -1 ;
if @FOnNewLine <> nil then FOnNewLine(Self, FRow, FPos - FLastEnterPos + 1, ci+1);
end;
Inc(Ci);
end;
FTokenId := ptOther;
FLen := ci - FPos;
end;
end;
FCol := FPos - FLastEnterPos + 1;
FToken := Copy(FData, FPos +1, FLen);
end;
procedure TPSPascalPreProcessorParser.SetText(const dta: tbtstring);
begin
FData := dta;
FText := pAnsichar(FData);
FLen := 0;
FPos := 0;
FCol := 1;
FLastEnterPos := 0;
FRow := 1;
if @FOnNewLine <> nil then FOnNewLine(Self, 1, 1, 0);
Next;
end;
{ TPSPreProcessor }
procedure TPSPreProcessor.AdjustMessage(Msg: TPSPascalCompilerMessage);
var
Res: TPSLineInfoResults;
begin
if CurrentLineInfo.GetLineInfo(Msg.ModuleName, Msg.Pos, Res) then
begin
Msg.SetCustomPos(res.Pos, Res.Row, Res.Col);
Msg.ModuleName := Res.Name;
end;
end;
procedure TPSPreProcessor.AdjustMessages(Comp: TPSPascalCompiler);
var
i: Longint;
begin
for i := 0 to Comp.MsgCount -1 do
AdjustMessage (Comp.Msg[i]);
end;
procedure TPSPreProcessor.Clear;
begin
FDefineState.Clear;
FDefines.Clear;
FCurrentDefines.Clear;
FCurrentLineInfo.Clear;
FMainFile := '';
end;
constructor TPSPreProcessor.Create;
begin
inherited Create;
FDefines := TStringList.Create;
FCurrentLineInfo := TPSLineInfoList.Create;
FCurrentDefines := TStringList.Create;
FDefines.Duplicates := dupIgnore;
FCurrentDefines.Duplicates := dupIgnore;
FDefineState := TPSDefineStates.Create;
FMaxLevel := 20;
doAddStdPredefines;
end;
destructor TPSPreProcessor.Destroy;
begin
FDefineState.Free;
FCurrentDefines.Free;
FDefines.Free;
FCurrentLineInfo.Free;
inherited Destroy;
end;
procedure TPSPreProcessor.doAddStdPredefines;
begin
//--- 20050708_jgv
FCurrentDefines.Add (Format ('VER%d', [PSCurrentBuildNo]));
{$IFDEF CPU386 }
FCurrentDefines.Add ('CPU386');
{$ENDIF }
{$IFDEF MSWINDOWS }
FCurrentDefines.Add ('MSWINDOWS');
FCurrentDefines.Add ('WIN32');
{$ENDIF }
{$IFDEF LINUX }
FCurrentDefines.Add ('LINUX');
{$ENDIF }
end;
procedure TPSPreProcessor.IntPreProcess(Level: Integer; const OrgFileName: tbtstring; FileName: tbtstring; Dest: TStream);
var
Parser: TPSPascalPreProcessorParser;
dta: tbtstring;
item: TPSLineInfo;
s, name: tbtstring;
current, i: Longint;
ds: TPSDefineState;
AppContinue: Boolean;
begin
if Level > MaxLevel then raise EPSPreProcessor.CreateFmt(RPS_TooManyNestedInclude, [FileName, OrgFileName]);
Parser := TPSPascalPreProcessorParser.Create;
try
Parser.OnNewLine := ParserNewLine;
if FileName = MainFileName then
begin
dta := MainFile;
end else
if (@OnNeedFile = nil) or (not OnNeedFile(Self, OrgFileName, FileName, dta)) then
raise EPSPreProcessor.CreateFmt(RPS_IncludeNotFound, [FileName, OrgFileName]);
Item := FCurrentLineInfo.Add;
current := FCurrentLineInfo.Count -1;
FCurrentLineInfo.Current := current;
Item.FStartPos := Dest.Position;
Item.FFileName := FileName;
Parser.SetText(dta);
while Parser.TokenId <> ptEOF do
begin
s := Parser.Token;
if Parser.TokenId = ptDefine then
begin
Delete(s,1,2); // delete the {$
Delete(s,length(s), 1); // delete the }
//-- 20050707_jgv trim right
i := length (s);
while (i > 0) and (s[i] = ' ') do begin
Delete (s, i, 1);
Dec (i);
end;
//-- end_jgv
if pos(tbtChar(' '), s) = 0 then
begin
name := uppercase(s);
s := '';
end else
begin
Name := uppercase(copy(s,1,pos(' ', s)-1));
Delete(s, 1, pos(' ', s));
end;
//-- 20050707_jgv - ask the application
AppContinue := True;
If @OnProcessDirective <> Nil then OnProcessDirective (Self, Parser, FDefineState.DoWrite, name, s, AppContinue, Filename);
If AppContinue then
//-- end jgv
if (Name = 'I') or (Name = 'INCLUDE') then
begin
if FDefineState.DoWrite then
begin
if assigned(@OnIncludingFile) then
OnIncludingFile(self , Filename, s);
FAddedPosition := 0;
IntPreProcess(Level +1, FileName, s, Dest);
FCurrentLineInfo.Current := current;
FAddedPosition := Cardinal(Dest.Position) - Item.StartPos - Parser.Pos;
end;
{ Added by Wizzup }
end else if (Name = 'INCLUDE_ONCE') then
begin
if FDefineState.DoWrite then
if (@OnFileAlreadyIncluded = nil) then
raise EPSPreProcessor.CreateFmt(RPS_IncludeOnceNotFound, [FileName, OrgFileName])
else
begin
if not OnFileAlreadyIncluded(Self, FileName, s) then
begin
FAddedPosition := 0;
IntPreProcess(Level +1, FileName, s, Dest);
FCurrentLineInfo.Current := current;
FAddedPosition := Cardinal(Dest.Position) - Item.StartPos - Parser.Pos;
end;
end;
{ Wizzup out }
end else if (Name = 'DEFINE') then
begin
if FDefineState.DoWrite then
begin
if pos(' ', s) <> 0 then raise EPSPreProcessor.CreateFmt(RPS_DefineTooManyParameters, [Parser.Row, Parser.Col]);
FCurrentDefines.Add(Uppercase(S));
end;
end else if (Name = 'UNDEF') then
begin
if FDefineState.DoWrite then
begin
if pos(' ', s) <> 0 then raise EPSPreProcessor.CreateFmt(RPS_DefineTooManyParameters, [Parser.Row, Parser.Col]);
i := FCurrentDefines.IndexOf(Uppercase(s));
if i <> -1 then
FCurrentDefines.Delete(i);
end;
end else if (Name = 'IFDEF') then
begin
if pos(' ', s) <> 0 then raise EPSPreProcessor.CreateFmt(RPS_DefineTooManyParameters, [Parser.Row, Parser.Col]);
//JeromeWelsh - nesting fix
if (FDefineState.DoWrite and (FCurrentDefines.IndexOf(Uppercase(s)) <> -1)) then
FDefineState.Add.DoWrite := True
else
FDefineState.Add.DoWrite := False;
end else if (Name = 'IFNDEF') then
begin
if pos(' ', s) <> 0 then raise EPSPreProcessor.CreateFmt(RPS_DefineTooManyParameters, [Parser.Row, Parser.Col]);
//JeromeWelsh - nesting fix
if (FCurrentDefines.IndexOf(Uppercase(s)) = -1) and FDefineState.DoWrite then
FDefineState.Add.DoWrite := True
else
FDefineState.Add.DoWrite := False;
end else if (Name = 'ENDIF') then
begin
//- jgv remove - borland use it (sysutils.pas)
//- if s <> '' then raise EPSPreProcessor.CreateFmt(RPS_DefineTooManyParameters, [Parser.Row, Parser.Col]);
if FDefineState.Count = 0 then
raise EPSPreProcessor.CreateFmt(RPS_NoIfdefForEndif, [Parser.Row, Parser.Col]);
FDefineState.Delete(FDefineState.Count -1); // remove define from list
end else if (Name = 'ELSE') then
begin
if s<> '' then raise EPSPreProcessor.CreateFmt(RPS_DefineTooManyParameters, [Parser.Row, Parser.Col]);
if FDefineState.Count = 0 then
raise EPSPreProcessor.CreateFmt(RPS_NoIfdefForElse, [Parser.Row, Parser.Col]);
ds := FDefineState[FDefineState.Count -1];
if ds.InElse then
raise EPSPreProcessor.CreateFmt(RPS_ElseTwice, [Parser.Row, Parser.Col]);
ds.FInElse := True;
//JeromeWelsh - nesting fix
ds.DoWrite := not ds.DoWrite and FDefineState.DoPrevWrite;
end
//-- 20050710_jgv custom application error process
else if Parser.Token[2] <> '.' then begin
If @OnProcessUnknowDirective <> Nil then begin
OnProcessUnknowDirective (Self, Parser, FDefineState.DoWrite, name, s, AppContinue, Filename);
end;
If AppContinue then
//-- end jgv
raise EPSPreProcessor.CreateFmt(RPS_UnknownCompilerDirective, [Parser.Row, Parser.Col]);
end;
end;
if (not FDefineState.DoWrite) or (Parser.TokenId = ptDefine) then
begin
SetLength(s, Length(Parser.Token));
for i := length(s) downto 1 do
s[i] := #32; // space
end;
Dest.Write(s[1], length(s));
Parser.Next;
end;
Item.FEndPos := Dest.Position;
finally
Parser.Free;
end;
end;
procedure TPSPreProcessor.ParserNewLine(Sender: TPSPascalPreProcessorParser; Row, Col, Pos: Cardinal);
begin
if FCurrentLineInfo.Current >= FCurrentLineInfo.Count then exit; //errr ???
with FCurrentLineInfo.Items[FCurrentLineInfo.Current] do
begin
Pos := Pos + FAddedPosition;
FLineOffsets.Add(Pointer(Pos));
end;
end;
procedure TPSPreProcessor.PreProcess(const Filename: tbtstring; var Output: tbtstring);
var
Stream: TMemoryStream;
begin
FAddedPosition := 0;
FCurrentDefines.Assign(FDefines);
Stream := TMemoryStream.Create;
try
IntPreProcess(0, '', FileName, Stream);
Stream.Position := 0;
SetLength(Output, Stream.Size);
Stream.Read(Output[1], Length(Output));
finally
Stream.Free;
end;
if FDefineState.Count <> 0 then
raise EPSPreProcessor.Create(RPs_DefineNotClosed);
end;
{ TPSDefineStates }
function TPSDefineStates.Add: TPSDefineState;
begin
Result := TPSDefineState.Create;
FItems.Add(Result);
end;
procedure TPSDefineStates.Clear;
var
i: Longint;
begin
for i := Longint(FItems.Count) -1 downto 0 do
TPSDefineState(FItems[i]).Free;
FItems.Clear;
end;
constructor TPSDefineStates.Create;
begin
inherited Create;
FItems := TIfList.Create;
end;
procedure TPSDefineStates.Delete(I: Integer);
begin
TPSDefineState(FItems[i]).Free;
FItems.Delete(i);
end;
destructor TPSDefineStates.Destroy;
var
i: Longint;
begin
for i := Longint(FItems.Count) -1 downto 0 do
TPSDefineState(FItems[i]).Free;
FItems.Free;
inherited Destroy;
end;
function TPSDefineStates.GetCount: Longint;
begin
Result := FItems.Count;
end;
function TPSDefineStates.GetItem(I: Integer): TPSDefineState;
begin
Result := FItems[i];
end;
function TPSDefineStates.GetWrite: Boolean;
begin
if FItems.Count = 0 then
result := true
else Result := TPSDefineState(FItems[FItems.Count -1]).DoWrite;
end;
//JeromeWelsh - nesting fix
function TPSDefineStates.GetPrevWrite: Boolean;
begin
if FItems.Count < 2 then
result := true
else Result := TPSDefineState(FItems[FItems.Count -2]).DoWrite;
end;
end.