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lpcompiler.pas
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lpcompiler.pas
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{
Author: Niels A.D
Project: Lape (https://github.com/nielsAD/lape)
License: GNU Lesser GPL (http://www.gnu.org/licenses/lgpl.html)
Script compiler, which turns a script into a syntax tree.
}
unit lpcompiler;
{$I lape.inc}
interface
uses
Classes, SysUtils,
lptypes, lpvartypes, lpparser, lptree;
const
ParserToken_ExpressionEnd = [tk_sym_SemiColon];
ParserToken_BlockEnd = [tk_kw_End, tk_kw_Finally, tk_kw_Except, tk_kw_Until];
type
TLapeTreeMethodMap = {$IFDEF FPC}specialize{$ENDIF} TLapeStringMap<TLapeTree_Method>;
TLapeInternalMethodMap = {$IFDEF FPC}specialize{$ENDIF} TLapeUniqueStringDictionary<TLapeTree_InternalMethodClass>;
TLapeTypeForwards = {$IFDEF FPC}specialize{$ENDIF} TLapeStringMap<TLapeType>;
TLapeFuncForwards = {$IFDEF FPC}specialize{$ENDIF} TLapeList<TLapeGlobalVar>;
TLapeTree_NodeStack = {$IFDEF FPC}specialize{$ENDIF} TLapeStack<TLapeTree_ExprBase>;
TLapeTree_OpStack = {$IFDEF FPC}specialize{$ENDIF} TLapeStack<TLapeTree_Operator>;
TLapeCompiler = class;
TLapeHandleDirective = function(Sender: TLapeCompiler; Directive, Argument: lpString; InPeek, InIgnore: Boolean): Boolean of object;
TLapeHandleExternal = function(Sender: TLapeCompiler; Header: TLapeGlobalVar): Boolean of object;
TLapeFindFile = function(Sender: TLapeCompiler; var FileName: lpString): TLapeTokenizerBase of object;
TLapeFindMacro = function(Sender: TLapeCompiler; Name: lpString; var Value: lpString): Boolean of object;
TLapeCompilerNotification = {$IFDEF FPC}specialize{$ENDIF} TLapeNotifier<TLapeCompiler>;
TLapeTokenizerArray = array of TLapeTokenizerBase;
TLapeDefine = record Name, Value: lpString; end;
TLapeDefineArray = array of TLapeDefine;
TLapeConditional = record
Eval: Boolean;
Pos: TDocPos;
end;
TLapeConditionalStack = {$IFDEF FPC}specialize{$ENDIF} TLapeStack<TLapeConditional>;
PCompilerState = ^TCompilerState;
TCompilerState = record
Tokenizer: Integer;
Tokenizers: array of TLapeTokenizerBase;
TokStates: array of Pointer;
Options: ECompilerOptionsSet;
Options_PackRecords: UInt8;
Defines: TLapeDefineArray;
Conditionals: TLapeConditionalStack.TTArray;
end;
PTempTokenizerState = ^TTempTokenizerState;
TTempTokenizerState = record
OldStackInfo: TLapeStackInfo;
OldTokenizer: TLapeTokenizerBase;
OldTokenizerIndex: Integer;
OldState: Pointer;
end;
TLapeCompiler = class(TLapeCompilerBase)
private
__tmp: TDocPos;
function getPDocPos: PDocPos; inline;
function hasTokenizer: Boolean; inline;
function hasMoreTokenizers: Boolean; inline;
function incTokenizerLock(ATokenizer: TLapeTokenizerBase): TLapeTokenizerBase;
procedure decTokenizerLock(var ATokenizer: TLapeTokenizerBase; DoFree: Boolean = True);
procedure setTokenizersPeek(Peek: Boolean);
protected
FTypeID: Integer;
FTokenizers: TLapeTokenizerArray;
FTokenizer: Integer;
FTreeMethodMap: TLapeTreeMethodMap;
FInternalMethodMap: TLapeInternalMethodMap;
FTree: TLapeTree_Base;
FDelayedTree: TLapeTree_DelayedStatementList;
FImporting: Pointer;
FIncludes: TStringList;
FBaseDefines: TLapeDefineArray;
FDefines: TLapeDefineArray;
FConditionalStack: TLapeConditionalStack;
FOnHandleDirective: TLapeHandleDirective;
FOnHandleExternal: TLapeHandleExternal;
FOnFindFile: TLapeFindFile;
FOnFindMacro: TLapeFindMacro;
FAfterParsing: TLapeCompilerNotification;
function getDocPos: TDocPos; override;
procedure Reset; override;
function getImporting: Boolean; virtual;
procedure setImporting(Import: Boolean); virtual;
procedure setBaseDefines(Defines: TLapeDefineArray); virtual;
function getTokenizer: TLapeTokenizerBase; virtual;
procedure setTokenizer(ATokenizer: TLapeTokenizerBase); virtual;
procedure pushTokenizer(ATokenizer: TLapeTokenizerBase); virtual;
function popTokenizer: TLapeTokenizerBase; virtual;
procedure pushConditional(AEval: Boolean; ADocPos: TDocPos); virtual;
function popConditional: TDocPos; virtual;
procedure SetUniqueTypeID(Typ: TLapeType); virtual;
function GetObjectifyMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar; virtual;
function GetDisposeMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar; virtual;
function GetCopyMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar; virtual;
function GetCompareMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar; virtual;
function GetToStringMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar; virtual;
procedure InitBaseDefinitions; virtual;
procedure InitBaseMath; virtual;
procedure InitBaseString; virtual;
procedure InitBaseDateTime; virtual;
procedure InitBaseVariant; virtual;
procedure InitBaseFile; virtual;
function EnsureExpression(Node: TLapeTree_ExprBase): TLapeTree_ExprBase; virtual;
function EnsureTypeExpression(Node: TLapeTree_Base): TLapeTree_Base; virtual;
function EnsureRange(Node: TLapeTree_Base; out VarType: TLapeType): TLapeTree_Range; overload; virtual;
function EnsureRange(Node: TLapeTree_Base): TLapeTree_Range; overload; virtual;
function EnsureRange(VarType: TLapeType): TLapeType; overload; virtual;
function EnsureConstantRange(Node: TLapeTree_Base; out VarType: TLapeType): TLapeRange; overload; virtual;
function EnsureConstantRange(Node: TLapeTree_Base): TLapeRange; overload; virtual;
function HandleDirective(Sender: TLapeTokenizerBase; Directive, Argument: lpString): Boolean; virtual;
function InIgnore: Boolean; virtual;
function Next: EParserToken; virtual;
function isNext(Tokens: EParserTokenSet; out Token: EParserToken): Boolean; overload; virtual;
function isNext(Tokens: EParserTokenSet): Boolean; overload; virtual;
function Peek: EParserToken; virtual;
function Expect(Token: EParserToken; NextBefore: Boolean = True; NextAfter: Boolean = False): EParserToken; overload; virtual;
function Expect(Tokens: EParserTokenSet; NextBefore: Boolean = True; NextAfter: Boolean = False): EParserToken; overload; virtual;
procedure ParseExpressionEnd(Token: EParserToken; NextBefore: Boolean = False; NextAfter: Boolean = True); overload; virtual;
procedure ParseExpressionEnd(Tokens: EParserTokenSet = ParserToken_ExpressionEnd; NextBefore: Boolean = False; NextAfter: Boolean = True); overload; virtual;
function ParseIdentifierList(FirstNext: Boolean = False): TStringArray; virtual;
function ParseBlockList(StopAfterBeginEnd: Boolean = True): TLapeTree_StatementList; virtual;
function ParseMethodHeader(out Name: lpString; addToScope: Boolean = True): TLapeType_Method; virtual;
function ParseMethod(FuncForwards: TLapeFuncForwards; FuncHeader: TLapeType_Method; FuncName: lpString; isExternal: Boolean): TLapeTree_Method; overload; virtual;
function ParseMethod(FuncForwards: TLapeFuncForwards; FuncHeader: TLapeType_Method; FuncName: lpString): TLapeTree_Method; overload; virtual;
function ParseMethod(FuncForwards: TLapeFuncForwards; isExternal: Boolean = False): TLapeTree_Method; overload; virtual;
function ParseType(TypeForwards: TLapeTypeForwards; addToStackOwner: Boolean = False; ScopedEnums: Boolean = False): TLapeType; virtual;
procedure ParseTypeBlock; virtual;
procedure ParseLabelBlock; virtual;
function ParseVarBlock(OneOnly: Boolean = False; ValidEnd: EParserTokenSet = [tk_sym_SemiColon]): TLapeTree_VarList; virtual;
function ParseExpression(ReturnOn: EParserTokenSet = []; FirstNext: Boolean = True; DoFold: Boolean = True; IsInternalMethod: Boolean = False): TLapeTree_ExprBase; virtual;
function ParseTypeExpression(ReturnOn: EParserTokenSet = []; FirstNext: Boolean = True; DoFold: Boolean = True): TLapeTree_Base; virtual;
function ParseStatement(FirstNext: Boolean = True; ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_Base; virtual;
function ParseStatementList: TLapeTree_StatementList; virtual;
function ParseBeginEnd(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_StatementList; virtual;
function ParseCase(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_Case; virtual;
function ParseFor(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_For; virtual;
function ParseIf(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_If; virtual;
function ParseRepeat(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_Repeat; virtual;
function ParseTry(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_Try; virtual;
function ParseWhile(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_While; virtual;
function ParseWith(ExprEnd: EParserTokenSet = ParserToken_ExpressionEnd): TLapeTree_With; virtual;
public
FreeTokenizer: Boolean;
FreeTree: Boolean;
constructor Create(
ATokenizer: TLapeTokenizerBase; ManageTokenizer: Boolean = True;
AEmitter: TLapeCodeEmitter = nil; ManageEmitter: Boolean = True
); reintroduce; virtual;
destructor Destroy; override;
procedure Clear; override;
function getState: Pointer; virtual;
procedure setState(const State: Pointer; DoFreeState: Boolean = True); virtual;
procedure freeState(const State: Pointer); virtual;
function getTempTokenizerState(const ATokenizer: TLapeTokenizerBase; ResetState: Boolean = True): Pointer; overload; virtual;
function getTempTokenizerState(const AStr: lpString; const AFileName: lpString = ''; ResetState: Boolean = True): Pointer; overload; virtual;
procedure resetTokenizerState(const State: Pointer; DoFreeState: Boolean = True); virtual;
procedure freeTempTokenizerState(const State: Pointer); virtual;
procedure StartImporting; virtual;
procedure EndImporting; virtual;
function addDelayedExpression(Node: TLapeTree_Base; AfterCompilation: Boolean = True; IsGlobal: Boolean = False): TLapeTree_Base; virtual;
function ParseFile: TLapeTree_Base; virtual;
procedure EmitCode(ACode: lpString; var Offset: Integer; Pos: PDocPos = nil); override;
function Compile: Boolean; virtual;
procedure CheckAfterCompile; virtual;
procedure VarToDefault(AVar: TResVar; var Offset: Integer; Pos: PDocPos = nil); override;
procedure FinalizeVar(AVar: TResVar; var Offset: Integer; Pos: PDocPos = nil); override;
function getDeclaration(AName: lpString; AStackInfo: TLapeStackInfo; LocalOnly: Boolean = False; CheckWith: Boolean = True): TLapeDeclaration; override;
function hasDeclaration(AName: lpString; AStackInfo: TLapeStackInfo; LocalOnly: Boolean = False; CheckWith: Boolean = True): Boolean; override;
function hasDeclaration(ADecl: TLapeDeclaration; AStackInfo: TLapeStackInfo; LocalOnly: Boolean = False; CheckWith: Boolean = True): Boolean; override;
function getDeclarationNoWith(AName: lpString; AStackInfo: TLapeStackInfo; LocalOnly: Boolean = False): TLapeDeclaration; overload; virtual;
function getDeclarationNoWith(AName: lpString; LocalOnly: Boolean = False): TLapeDeclaration; overload; virtual;
function getExpression(AName: lpString; AStackInfo: TLapeStackInfo; Pos: PDocPos = nil; LocalOnly: Boolean = False): TLapeTree_ExprBase; overload; virtual;
function getExpression(AName: lpString; Pos: PDocPos = nil; LocalOnly: Boolean = False): TLapeTree_ExprBase; overload; virtual;
function hasBaseDefine(AName: lpString): Boolean; virtual;
function hasDefine(AName: lpString): Boolean; virtual;
procedure addBaseDefine(AName: lpString; AValue: lpString = ''); virtual;
procedure addDefine(AName: lpString; AValue: lpString = ''); virtual;
function addLocalDecl(Decl: TLapeDeclaration; AStackInfo: TLapeStackInfo): TLapeDeclaration; override;
function addLocalVar(AVar: TLapeType; Name: lpString = ''): TLapeVar; virtual;
function addGlobalVar(AVar: TLapeGlobalVar; AName: lpString = ''): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Typ: lpString; Value: lpString; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Typ: TLapeType; AName: lpString; Value: lpString = ''): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Typ: ELapeBaseType; AName: lpString; Value: lpString = ''): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Typ: lpString; Value: Pointer; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Typ: TLapeType; Value: Pointer; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Typ: ELapeBaseType; Value: Pointer; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: Int32; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: UInt32; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: Int64; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: UInt64; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: Extended; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: EvalBool; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: ShortString; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: AnsiString; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: UnicodeString; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: AnsiChar; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: WideChar; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: Variant; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalVar(Value: Pointer; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalType(Typ: TLapeType; AName: lpString = ''; ACopy: Boolean = True): TLapeType; overload; virtual;
function addGlobalType(Str: lpString; AName: lpString): TLapeType; overload; virtual;
function addGlobalFunc(AHeader: lpString; Value: Pointer): TLapeGlobalVar; overload; virtual;
function addGlobalFunc(AHeader: TLapeType_Method; AName, Body: lpString): TLapeTree_Method; overload; virtual;
function addGlobalFunc(AParams: array of TLapeType; AParTypes: array of ELapeParameterType; AParDefaults: array of TLapeGlobalVar; ARes: TLapeType; Value: Pointer; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalFunc(AParams: array of TLapeType; AParTypes: array of ELapeParameterType; AParDefaults: array of TLapeGlobalVar; Value: Pointer; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalMethod(AFunc: TLapeGlobalVar; Value: TMethod; FreeFunc: Boolean = True): TLapeGlobalVar; overload; virtual;
function addGlobalMethod(AHeader: lpString; Value: TMethod): TLapeGlobalVar; overload; virtual;
function addGlobalMethod(AHeader: lpString; AMethod, ASelf: Pointer): TLapeGlobalVar; overload; virtual;
function addGlobalMethod(AParams: array of TLapeType; AParTypes: array of ELapeParameterType; AParDefaults: array of TLapeGlobalVar; ARes: TLapeType; Value: TMethod; AName: lpString): TLapeGlobalVar; overload; virtual;
function addGlobalMethod(AParams: array of TLapeType; AParTypes: array of ELapeParameterType; AParDefaults: array of TLapeGlobalVar; Value: TMethod; AName: lpString): TLapeGlobalVar; overload; virtual;
function addDelayedCode(ACode: lpString; AFileName: lpString = ''; AfterCompilation: Boolean = True; IsGlobal: Boolean = True): TLapeTree_Base; virtual;
property InternalMethodMap: TLapeInternalMethodMap read FInternalMethodMap;
property Tree: TLapeTree_Base read FTree;
property DelayedTree: TLapeTree_DelayedStatementList read FDelayedTree;
property Importing: Boolean read getImporting write setImporting;
property Tokenizer: TLapeTokenizerBase read getTokenizer write setTokenizer;
property Defines: TLapeDefineArray read FDefines write setBaseDefines;
property OnHandleDirective: TLapeHandleDirective read FOnHandleDirective write FOnHandleDirective;
property OnHandleExternal: TLapeHandleExternal read FOnHandleExternal write FOnHandleExternal;
property OnFindFile: TLapeFindFile read FOnFindFile write FOnFindFile;
property OnFindMacro: TLapeFindMacro read FOnFindMacro write FOnFindMacro;
property AfterParsing: TLapeCompilerNotification read FAfterParsing;
end;
TLapeType_SystemUnit = class(TLapeType)
public
constructor Create(ACompiler: TLapeCompilerBase); reintroduce; virtual;
procedure ClearSubDeclarations; override;
function CanHaveChild: Boolean; override;
function HasChild(AName: lpString): Boolean; override;
function HasChild(ADecl: TLapeDeclaration): Boolean; override;
function HasConstantChild(Left: TLapeGlobalVar; AName: lpString): Boolean; override;
function EvalRes(Op: EOperator; Right: TLapeGlobalVar; Flags: ELapeEvalFlags = []): TLapeType; override;
function EvalConst(Op: EOperator; Left, Right: TLapeGlobalVar; Flags: ELapeEvalFlags): TLapeGlobalVar; override;
end;
implementation
uses
Variants,
{$IFDEF Lape_NeedAnsiStringsUnit}AnsiStrings,{$ENDIF}
lpvartypes_ord, lpvartypes_record, lpvartypes_array,
lpmessages, lpeval, lpinterpreter;
function TLapeCompiler.getPDocPos: PDocPos;
begin
__tmp := DocPos;
Result := @__tmp;
end;
function TLapeCompiler.hasTokenizer: Boolean;
begin
Result := FTokenizer >= 0;
end;
function TLapeCompiler.hasMoreTokenizers: Boolean;
begin
Result := FTokenizer > 0;
end;
function TLapeCompiler.incTokenizerLock(ATokenizer: TLapeTokenizerBase): TLapeTokenizerBase;
begin
Result := ATokenizer;
if (Result <> nil) then
Inc(Result.Tag);
end;
procedure TLapeCompiler.decTokenizerLock(var ATokenizer: TLapeTokenizerBase; DoFree: Boolean = True);
begin
if (ATokenizer <> nil) then
begin
Dec(ATokenizer.Tag);
if (ATokenizer.Tag < 0) and DoFree then
FreeAndNil(ATokenizer);
end;
end;
type
__LapeTokenizerBase = class(TLapeTokenizerBase);
procedure TLapeCompiler.setTokenizersPeek(Peek: Boolean);
var
i: Integer;
begin
for i := 0 to High(FTokenizers) do
if (FTokenizers[i] <> nil) then
__LapeTokenizerBase(FTokenizers[i]).FInPeek := Peek;
end;
function TLapeCompiler.getDocPos: TDocPos;
begin
if hasTokenizer() then
Result := Tokenizer.DocPos
else
Result := NullDocPos;
end;
procedure TLapeCompiler.Reset;
begin
inherited;
EndImporting();
FOptions := FBaseOptions;
FOptions_PackRecords := FBaseOptions_PackRecords;
FTokenizer := High(FTokenizers);
while hasMoreTokenizers() do
popTokenizer();
if (FTokenizer = 0) and (FTokenizers[0] <> nil) then
FTokenizers[0].Reset();
if FreeTree and (FTree <> nil) then
FTree.Free();
FTree := nil;
if (FDelayedTree <> nil) then
FDelayedTree.Clean();
if (FTreeMethodMap <> nil) then
FTreeMethodMap.Clear();
if (FIncludes <> nil) then
FIncludes.Clear();
if (FConditionalStack <> nil) then
FConditionalStack.Reset();
FDefines := FBaseDefines;
end;
function TLapeCompiler.getImporting: Boolean;
begin
Result := FImporting <> nil;
end;
procedure TLapeCompiler.setImporting(Import: Boolean);
begin
if Import then
StartImporting()
else
EndImporting();
end;
procedure TLapeCompiler.setBaseDefines(Defines: TLapeDefineArray);
begin
FBaseDefines := Defines;
Reset();
end;
function TLapeCompiler.getTokenizer: TLapeTokenizerBase;
begin
if hasTokenizer() then
Result := FTokenizers[FTokenizer]
else
Result := nil;
end;
procedure TLapeCompiler.setTokenizer(ATokenizer: TLapeTokenizerBase);
begin
if hasTokenizer() and (FreeTokenizer or hasMoreTokenizers()) and
(FTokenizer < Length(FTokenizers)) and (Tokenizer <> ATokenizer)
then
decTokenizerLock(FTokenizers[FTokenizer]);
if (not hasTokenizer()) then
FTokenizer := 0;
if (Length(FTokenizers) <= FTokenizer) then
SetLength(FTokenizers, FTokenizer + 1);
FTokenizers[FTokenizer] := ATokenizer;
if (ATokenizer <> nil) then
begin
ATokenizer.OnHandleDirective := {$IFDEF FPC}@{$ENDIF}HandleDirective;
ATokenizer.Reset();
end;
end;
procedure TLapeCompiler.pushTokenizer(ATokenizer: TLapeTokenizerBase);
var
InPeek: Boolean;
begin
InPeek := (Tokenizer <> nil) and Tokenizer.InPeek;
Inc(FTokenizer);
setTokenizer(ATokenizer);
if InPeek and (ATokenizer <> nil) then
__LapeTokenizerBase(Tokenizer).FInPeek := True;
end;
function TLapeCompiler.popTokenizer: TLapeTokenizerBase;
var
LastTok: EParserToken;
begin
Result := Tokenizer;
if (Tokenizer <> nil) then
LastTok := Tokenizer.LastTok
else
LastTok := tk_NULL;
setTokenizer(nil);
Dec(FTokenizer);
if (Tokenizer <> nil) then
__LapeTokenizerBase(Tokenizer).FLastTok := LastTok;
end;
procedure TLapeCompiler.pushConditional(AEval: Boolean; ADocPos: TDocPos);
var
Conditional: TLapeConditional;
begin
Assert(FConditionalStack <> nil);
with Conditional do
begin
Eval := AEval;
Pos := ADocPos;
end;
FConditionalStack.Push(Conditional);
end;
function TLapeCompiler.popConditional: TDocPos;
begin
Assert(FConditionalStack <> nil);
if (FConditionalStack.Count > 0) then
Result := FConditionalStack.Pop().Pos
else
LapeException(lpeLostConditional, Tokenizer.DocPos);
end;
procedure GetMethod_FixupParams(var AType: TLapeType_Method; var AParams: TLapeTypeArray; var AResult: TLapeType; AddResultToParams: Boolean = False);
var
i: Integer;
begin
if (AType <> nil) then
begin
if (AType.Params.Count > 0) then
begin
SetLength(AParams, AType.Params.Count);
for i := 0 to AType.Params.Count - 1 do
AParams[i] := AType.Params[i].VarType;
end;
AResult := AType.Res;
end;
if AddResultToParams and (AResult <> nil) then
begin
SetLength(AParams, Length(AParams) + 1);
AParams[High(AParams)] := AResult;
AResult := nil;
end;
end;
procedure TLapeCompiler.SetUniqueTypeID(Typ: TLapeType);
begin
Typ.TypeID := FTypeID;
Inc(FTypeID);
end;
function TLapeCompiler.GetObjectifyMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar;
var
Method: TLapeTree_Method;
Invoke: TLapeTree_Invoke;
Assignment: TLapeTree_Operator;
Callback: TResVar;
i: Int32;
begin
Result := nil;
if (AType = nil) or (AType.ClassType <> TLapeType_MethodOfObject) then
Exit;
IncStackInfo();
try
Result := addManagedDecl(AType.NewGlobalVar(EndJump)) as TLapeGlobalVar;
Method := TLapeTree_Method.Create(Result, FStackInfo, Self);
Method.Statements := TLapeTree_StatementList.Create(Method);
Callback := _ResVar.New(FStackInfo.addSelfVar(lptConstRef, getGlobalType('ConstPointer')));
Callback.VarType := addManagedType(TLapeType_Method.Create(AType));
Invoke := TLapeTree_Invoke.Create(TLapeTree_ResVar.Create(Callback.IncLock(), Self), Self);
for i := 0 to AType.Params.Count - 1 do
Invoke.addParam(TLapeTree_ResVar.Create(_ResVar.New(FStackInfo.addVar(AType.Params[i].ParType, AType.Params[i].VarType)), Self));
if (AType.Res <> nil) then
begin
Assignment := TLapeTree_Operator.Create(op_Assign, Self);
Assignment.Left := TLapeTree_ResVar.Create(_ResVar.New(FStackInfo.addVar(lptOut, AType.Res)), Self);
Assignment.Right := Invoke;
Method.Statements.addStatement(Assignment);
end else
Method.Statements.addStatement(Invoke);
addDelayedExpression(Method);
finally
DecStackInfo(True, False, Method = nil);
end;
end;
function TLapeCompiler.GetDisposeMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar;
var
Method: TLapeTree_Method;
begin
Result := nil;
Method := nil;
GetMethod_FixupParams(AType, AParams, AResult);
if (Sender = nil) or (Length(AParams) <> 1) or (AParams[0] = nil) or (AResult <> nil) then
Exit;
if (not (lcoFullDisposal in FOptions)) and (not AParams[0].NeedFinalization) then
Exit;
if (AType = nil) then
AType := addManagedType(TLapeType_Method.Create(Self, [AParams[0]], [lptVar], [TLapeGlobalVar(nil)], AResult)) as TLapeType_Method;
IncStackInfo();
try
Result := AType.NewGlobalVar(EndJump);
Sender.addMethod(Result);
Method := TLapeTree_Method.Create(Result, FStackInfo, Self);
Method.Statements := TLapeTree_StatementList.Create(Self);
Method.Statements.addStatement(TLapeTree_FinalizeVar.Create(FStackInfo.addVar(lptVar, AParams[0], '!AVar'), Self));
addDelayedExpression(Method);
finally
DecStackInfo(True, False, Method = nil);
end;
end;
function TLapeCompiler.GetCopyMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar;
var
Method: TLapeTree_Method;
Assignment: TLapeTree_Operator;
begin
Result := nil;
Method := nil;
GetMethod_FixupParams(AType, AParams, AResult, True);
if (Sender = nil) or (Length(AParams) <> 2) or (AParams[0] = nil) or (AParams[1] = nil) or (AResult <> nil) or (not AParams[0].CompatibleWith(AParams[1])) then
Exit;
if (not AParams[0].NeedFinalization) and (not AParams[1].NeedInitialization) then
Exit;
if (AType = nil) then
AType := addManagedType(TLapeType_Method.Create(Self, [AParams[0], AParams[1]], [lptConstRef, lptOut], [TLapeGlobalVar(nil), TLapeGlobalVar(nil)], AResult)) as TLapeType_Method;
IncStackInfo();
try
Result := AType.NewGlobalVar(EndJump);
Sender.addMethod(Result);
Assignment := TLapeTree_Operator.Create(op_Assign, Self);
Assignment.Right := TLapeTree_ResVar.Create(_ResVar.New(FStackInfo.addVar(lptConstRef, AParams[0], '!Src')), Self);
Assignment.Left := TLapeTree_ResVar.Create(_ResVar.New(FStackInfo.addVar(lptOut, AParams[1], '!Dst')), Self);
Method := TLapeTree_Method.Create(Result, FStackInfo, Self);
Method.Statements := TLapeTree_StatementList.Create(Self);
Method.Statements.addStatement(Assignment);
addDelayedExpression(Method);
finally
DecStackInfo(True, False, Method = nil);
end;
end;
function TLapeCompiler.GetCompareMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar;
var
Method: TLapeTree_Method;
Statement: TLapeTree_If;
Assign: TLapeTree_Operator;
LeftVar, RightVar, ResultVar: TResVar;
begin
Result := nil;
Method := nil;
GetMethod_FixupParams(AType, AParams, AResult);
if (Sender = nil) or (Length(AParams) <> 2) or (AParams[0] = nil) or (AParams[1] = nil) or (AResult = nil) then
Exit;
if (AType = nil) then
AType := addManagedType(TLapeType_Method.Create(Self, [AParams[0], AParams[1]], [lptConstRef, lptConstRef], [TLapeGlobalVar(nil), TLapeGlobalVar(nil)], AResult)) as TLapeType_Method;
IncStackInfo();
try
Result := AType.NewGlobalVar(EndJump);
Sender.addMethod(Result);
Method := TLapeTree_Method.Create(Result, FStackInfo, Self);
Method.Statements := TLapeTree_StatementList.Create(Self);
LeftVar := _ResVar.New(FStackInfo.addVar(lptConstRef, nil, 'Left')).IncLock();
RightVar := _ResVar.New(FStackInfo.addVar(lptConstRef, nil, 'Right')).IncLock();
ResultVar := _ResVar.New(FStackInfo.addVar(lptOut, AResult, 'Result')).IncLock();
LeftVar.VarType := AParams[0];
RightVar.VarType := AParams[1];
// op_cmp_LessThan
Statement := TLapeTree_If.Create(Self);
Statement.Condition := TLapeTree_Operator.Create(op_cmp_LessThan, Self);
with TLapeTree_Operator(Statement.Condition) do
begin
Left := TLapeTree_ResVar.Create(LeftVar.IncLock(), Self);
Right := TLapeTree_ResVar.Create(RightVar.IncLock(), Self);
end;
Statement.Body := TLapeTree_InternalMethod_Exit.Create(Method);
with TLapeTree_InternalMethod_Exit(Statement.Body) do
addParam(TLapeTree_Integer.Create(-1, Statement.Body));
Method.Statements.addStatement(Statement);
// op_cmp_GreaterThan
Statement := TLapeTree_If.Create(Self);
Statement.Condition := TLapeTree_Operator.Create(op_cmp_GreaterThan, Self);
with TLapeTree_Operator(Statement.Condition) do
begin
Left := TLapeTree_ResVar.Create(LeftVar.IncLock(), Self);
Right := TLapeTree_ResVar.Create(RightVar.IncLock(), Self);
end;
Statement.Body := TLapeTree_InternalMethod_Exit.Create(Method);
with TLapeTree_InternalMethod_Exit(Statement.Body) do
addParam(TLapeTree_Integer.Create(1, Statement.Body));
Method.Statements.addStatement(Statement);
// op_cmp_Equal
if (not (lcoAlwaysInitialize in Method.CompilerOptions)) then
begin
Assign := TLapeTree_Operator.Create(op_Assign, Self);
with Assign do
begin
Left := TLapeTree_ResVar.Create(ResultVar.IncLock(), Self);
Right := TLapeTree_Integer.Create(0, Assign);
end;
Method.Statements.addStatement(Assign);
end;
addDelayedExpression(Method);
finally
DecStackInfo(True, False, Method = nil);
end;
end;
function TLapeCompiler.GetToStringMethod(Sender: TLapeType_OverloadedMethod; AType: TLapeType_Method; AParams: TLapeTypeArray = nil; AResult: TLapeType = nil): TLapeGlobalVar;
var
Body: lpString;
Index: Integer;
begin
Result := nil;
GetMethod_FixupParams(AType, AParams, AResult);
if (Sender = nil) or (Length(AParams) <> 1) or (AParams[0] = nil) or ((AResult <> nil) and (AResult.BaseType <> ltString)) then
Exit;
if (AResult = nil) and (AType = nil) then
AResult := getBaseType(ltString);
if (AType = nil) then
AType := addManagedType(TLapeType_Method.Create(Self, [AParams[0]], [lptConstRef], [TLapeGlobalVar(nil)], AResult)) as TLapeType_Method;
Result := AType.NewGlobalVar(@_LapeToString_Unknown);
Sender.addMethod(Result);
Body := AParams[0].VarToStringBody(Sender);
if (Body = '') and Sender.NeedFullMatch then
try
Sender.NeedFullMatch := False;
Assert(Result.DeclarationList = Sender.ManagedDeclarations);
Result.DeclarationList := nil;
Index := Sender.getMethodIndex(AParams, AResult);
if (Index < 0) then
Index := Sender.getMethodIndex(getTypeArray([getBaseType(AParams[0].BaseType)]), AResult);
if (Index >= 0) then
begin
Body := 'begin Result := System.ToString[' + lpString(IntToStr(Index)) + '](Param0); end;';
Result.DeclarationList := Sender.ManagedDeclarations;
end;
finally
Sender.NeedFullMatch := True;
end;
if (Body <> '') then
Result := addGlobalFunc(AType, 'ToString', 'override;' + LapeDelayedFlags + Body + LineEnding).Method
else
FreeAndNil(Result);
end;
procedure TLapeCompiler.InitBaseDefinitions;
procedure addCompilerFuncs;
const
pn = lptNormal;
pv = lptVar;
var
a, w, u, i, b, n: TLapeType;
gn: TlapeGlobalVar;
begin
a := getBaseType(ltAnsiString);
w := getBaseType(ltWideString);
u := getBaseType(ltUnicodeString);
i := getBaseType(ltSizeInt);
b := getBaseType(ltEvalBool);
n := nil;
gn := nil;
addGlobalFunc([n, n, i], [pv, pv, pn], [gn, gn, gn], b, @_LapeCompareMem, '!cmp');
addGlobalFunc([n, n, i], [pv, pv, pn], [gn, gn, gn], @_LapeMove, '!move');
addGlobalFunc([n], [pn], [gn], i, @_LapeHigh, '!high');
addGlobalFunc([n], [pn], [gn], i, @_LapeLength, '!length');
addGlobalFunc([a], [pn], [gn], i, @_LapeAStr_GetLen, '!astr_getlen');
addGlobalFunc([w], [pn], [gn], i, @_LapeWStr_GetLen, '!wstr_getlen');
addGlobalFunc([u], [pn], [gn], i, @_LapeUStr_GetLen, '!ustr_getlen');
end;
function NewMagicMethod(GetMethod: TLapeGetOverloadedMethod; NeedFullMatch: Boolean = True): TLapeType_OverloadedMethod;
begin
Result := TLapeType_OverloadedMethod.Create(Self);
Result.OnFunctionNotFound := GetMethod;
Result.NeedFullMatch := NeedFullMatch;
addManagedDecl(Result);
end;
procedure addToString;
var
OLMethod: TLapeType_OverloadedMethod;
BaseType: ELapeBaseType;
begin
OLMethod := NewMagicMethod({$IFDEF FPC}@{$ENDIF}GetToStringMethod);
for BaseType := Low(ELapeBaseType) to High(ELapeBaseType) do
if ({$IFNDEF FPC}@{$ENDIF}LapeToStrArr[BaseType] <> nil) then
OLMethod.addMethod(
TLapeType_Method(addManagedType(
TLapeType_Method.Create(
Self,
[getBaseType(BaseType)],
[lptConstRef],
[TLapeGlobalVar(nil)],
getBaseType(ltString)
)
)).NewGlobalVar(
{$IFNDEF FPC}@{$ENDIF}LapeToStrArr[BaseType]
)
);
addGlobalVar(OLMethod.NewGlobalVar('ToString'));
end;
begin
StartImporting();
addBaseDefine('Lape');
addBaseDefine('Sesquipedalian');
{$IFDEF Lape_CaseSensitive}
addBaseDefine('Lape_CaseSensitive');
{$ELSE}
addBaseDefine('Lape_CaseInsensitive');
{$ENDIF}
{$IFDEF Lape_PascalLabels}
addBaseDefine('Lape_PascalLabels');
{$ELSE}
addBaseDefine('Lape_LapeLabels');
{$ENDIF}
{$IFDEF Lape_Unicode}
addBaseDefine('Lape_Unicode');
{$ELSE}
addBaseDefine('Lape_Ansi');
{$ENDIF}
addCompilerFuncs();
addGlobalVar(addManagedType(TLapeType_SystemUnit.Create(Self)).NewGlobalVarP(nil), 'System').isConstant := True;
addGlobalType(TLapeType_Label.Create(Self), '!label');
addGlobalType(TLapeType_Pointer.Create(Self, nil, True), 'ConstPointer');
addGlobalType(getBaseType(ltString).createCopy(), 'string');
addGlobalType(getBaseType(ltChar).createCopy(), 'Char');
addGlobalType(getBaseType(ltEvalBool).createCopy(), 'EvalBool');
addGlobalType('packed record Method, Self: Pointer; end;', 'TMethod');
addGlobalType(getBaseType(DetermineIntType(SizeOf(SizeInt), True)).createCopy(), 'SizeInt');
addGlobalType(getBaseType(DetermineIntType(SizeOf(SizeUInt), False)).createCopy(), 'SizeUInt');
addGlobalType(getBaseType(DetermineIntType(SizeOf(NativeInt), True)).createCopy(), 'NativeInt');
addGlobalType(getBaseType(DetermineIntType(SizeOf(NativeUInt), False)).createCopy(), 'NativeUInt');
addGlobalType(getBaseType(DetermineIntType(SizeOf(PtrInt), True)).createCopy(), 'PtrInt');
addGlobalType(getBaseType(DetermineIntType(SizeOf(PtrUInt), False)).createCopy(), 'PtrUInt');
addDelayedCode(
'const' + LineEnding +
' True = EvalBool(1);' + LineEnding +
' False = EvalBool(0);' + LineEnding +
' nil = Pointer(0);'
);
addGlobalFunc('procedure _Write(s: string);', @_LapeWrite);
addGlobalFunc('procedure _WriteLn();', @_LapeWriteLn);
addGlobalFunc('procedure _Assert(Expr: EvalBool); overload;', @_LapeAssert);
addGlobalFunc('procedure _Assert(Expr: EvalBool; Msg: string); overload;', @_LapeAssertMsg);
addGlobalFunc('procedure _RangeCheck(Idx, Lo, Hi: SizeInt);', @_LapeRangeCheck);
addGlobalFunc('procedure _SStr_SetLen(var s; l, m: UInt8);', @_LapeSStr_SetLen);
addGlobalFunc('procedure _AStr_SetLen(var s: AnsiString; l: SizeInt);', @_LapeAStr_SetLen);
addGlobalFunc('procedure _WStr_SetLen(var s: WideString; l: SizeInt);', @_LapeWStr_SetLen);
addGlobalFunc('procedure _UStr_SetLen(var s: UnicodeString; l: SizeInt);', @_LapeUStr_SetLen);
addGlobalFunc('procedure _SStr_Copy(s: ShortString; Start: UInt8 = 1; Count: UInt8 = High(UInt8); out Result: AnsiString);', @_LapeSStr_Copy);
addGlobalFunc('procedure _AStr_Copy(s: AnsiString; Start: SizeInt = 1; Count: SizeInt = High(SizeInt); out Result: AnsiString);', @_LapeAStr_Copy);
addGlobalFunc('procedure _WStr_Copy(s: WideString; Start: SizeInt = 1; Count: SizeInt = High(SizeInt); out Result: WideString);', @_LapeWStr_Copy);
addGlobalFunc('procedure _UStr_Copy(s: UnicodeString; Start: SizeInt = 1; Count: SizeInt = High(SizeInt); out Result: UnicodeString);', @_LapeUStr_Copy);
addGlobalFunc('procedure _SStr_Delete(var s; Start: UInt8; Count: UInt8 = High(UInt8));', @_LapeSStr_Delete);
addGlobalFunc('procedure _AStr_Delete(var s: AnsiString; Start: SizeInt; Count: SizeInt = High(SizeInt));', @_LapeAStr_Delete);
addGlobalFunc('procedure _WStr_Delete(var s: WideString; Start: SizeInt; Count: SizeInt = High(SizeInt));', @_LapeWStr_Delete);
addGlobalFunc('procedure _UStr_Delete(var s: UnicodeString; Start: SizeInt; Count: SizeInt = High(SizeInt));', @_LapeUStr_Delete);
addGlobalFunc('procedure _AStr_Insert(Src: AnsiString; var Dst: AnsiString; Pos: SizeInt = 1; Count: SizeInt = 0);', @_LapeAStr_Insert);
addGlobalFunc('procedure _WStr_Insert(Src: WideString; var Dst: WideString; Pos: SizeInt = 1; Count: SizeInt = 0);', @_LapeWStr_Insert);
addGlobalFunc('procedure _UStr_Insert(Src: UnicodeString; var Dst: UnicodeString; Pos: SizeInt = 1; Count: SizeInt = 0);', @_LapeUStr_Insert);
addGlobalFunc('procedure _SortWeighted(A: Pointer; Len, ElSize: SizeInt; Weights: array of Int32; SortUp: EvalBool); overload;', @_LapeSortWeighted_Int32);
addGlobalFunc('procedure _SortWeighted(A: Pointer; Len, ElSize: SizeInt; Weights: array of Int64; SortUp: EvalBool); overload;', @_LapeSortWeighted_Int64);
addGlobalFunc('procedure _SortWeighted(A: Pointer; Len, ElSize: SizeInt; Weights: array of Extended; SortUp: EvalBool); overload;', @_LapeSortWeighted_Extended);
addGlobalFunc('function GetMem(i: SizeInt): Pointer;', @_LapeGetMem);
addGlobalFunc('function AllocMem(i: SizeInt): Pointer;', @_LapeAllocMem);
addGlobalFunc('procedure FreeMem(p: Pointer);', @_LapeFreeMem);
addGlobalFunc('procedure ReallocMem(var p: Pointer; s: SizeInt);', @_LapeReallocMem);
addGlobalFunc('procedure FillMem(var p; s: SizeInt; b: UInt8 = 0);', @_LapeFillMem);
addGlobalFunc('procedure Move(constref Src; var Dst; s: SizeInt);', @_LapeMove);
addGlobalFunc('function CompareMem(constref p1, p2; Length: SizeInt): EvalBool;', @_LapeCompareMem);
addGlobalFunc('function Assigned(constref p): EvalBool;', @_LapeAssigned);
//addGlobalFunc('procedure RaiseException(Ex: TExceptionObject); overload;', @_LapeRaise);
addGlobalFunc('procedure RaiseException(Ex: string); overload;', @_LapeRaiseString);
addGlobalFunc('procedure UniqueString(var Str: AnsiString); overload;', @_LapeAStr_Unique);
addGlobalFunc('procedure UniqueString(var Str: WideString); overload;', @_LapeWStr_Unique);
addGlobalFunc('procedure UniqueString(var Str: UnicodeString); overload;', @_LapeUStr_Unique);
addToString();
addGlobalVar(NewMagicMethod({$IFDEF FPC}@{$ENDIF}GetObjectifyMethod).NewGlobalVar('_Objectify'));
addGlobalVar(NewMagicMethod({$IFDEF FPC}@{$ENDIF}GetDisposeMethod).NewGlobalVar('_Dispose'));
addGlobalVar(NewMagicMethod({$IFDEF FPC}@{$ENDIF}GetCopyMethod).NewGlobalVar('_Assign'));
addGlobalVar(NewMagicMethod({$IFDEF FPC}@{$ENDIF}GetCompareMethod).NewGlobalVar('_Compare'));
InitBaseMath();
InitBaseString();
InitBaseDateTime();
InitBaseVariant();
InitBaseFile();
addDelayedCode(
LapeDelayedFlags +
_LapeToString_Enum +
Format(_LapeToString_Set, ['Small', Ord(High(ELapeSmallEnum))]) +
Format(_LapeToString_Set, ['Large', Ord(High(ELapeLargeEnum))]) +
_LapeToString_Array +
_LapeSwap +
_LapeSetLength +
_LapeCopy +
_LapeDelete +
_LapeInsert +
_LapeSort,
'!addDelayedCore'
);
EndImporting();
end;
procedure TLapeCompiler.InitBaseMath;
begin
{$I lpeval_import_math.inc}
end;
procedure TLapeCompiler.InitBaseString;
begin
{$I lpeval_import_string.inc}
end;
procedure TLapeCompiler.InitBaseDateTime;
begin
{$I lpeval_import_datetime.inc}
end;
procedure TLapeCompiler.InitBaseVariant;
begin
{$I lpeval_import_variant.inc}
end;
procedure TLapeCompiler.InitBaseFile;
begin
{$I lpeval_import_file.inc}
end;
function TLapeCompiler.EnsureExpression(Node: TLapeTree_ExprBase): TLapeTree_ExprBase;
begin
if (Node <> nil) then
Result := Node
else
Result := TLapeTree_ExprBase.Create(Self, getPDocPos());
end;
function TLapeCompiler.EnsureTypeExpression(Node: TLapeTree_Base): TLapeTree_Base;
begin
if (Node <> nil) then
Result := Node
else
Result := TLapeTree_Base.Create(Self, getPDocPos());
end;
function TLapeCompiler.EnsureRange(Node: TLapeTree_Base; out VarType: TLapeType): TLapeTree_Range;
begin
VarType := nil;
if (Node <> nil) and (Node is TLapeTree_Range) then
Result := TLapeTree_Range(Node)
else if (Node <> nil) and (Node is TLapeTree_VarType) and (TLapeTree_VarType(Node).VarType <> nil) then
begin
Result := TLapeTree_Range.Create(Self, @Node._DocPos);
with TLapeTree_VarType(Node).VarType do
begin
Result.Lo := TLapeTree_GlobalVar.Create(VarLo(), Self, @Node._DocPos);
Result.Hi := TLapeTree_GlobalVar.Create(VarHi(), Self, @Node._DocPos);
end;
end
else
LapeException(lpeInvalidRange, [Node, Self]);
if (Result.Lo <> nil) and (Result.Hi <> nil) then
VarType := Result.Hi.resType();
if (VarType = nil) or (not VarType.CompatibleWith(Result.Lo.resType())) then
LapeException(lpeInvalidRange, Node.DocPos);
end;
function TLapeCompiler.EnsureRange(Node: TLapeTree_Base): TLapeTree_Range;
var
VarType: TLapeType;
begin
Result := EnsureRange(Node, VarType);
end;
function TLapeCompiler.EnsureRange(VarType: TLapeType): TLapeType;
var
Node: TLapeTree_VarType;
Range: TLapeRange;
begin
if (VarType = nil) or (VarType is TLapeType_SubRange) then
Exit(VarType);
Node := TLapeTree_VarType.Create(VarType, Self);
try
Range := EnsureConstantRange(Node, VarType);
Result := addManagedType(TLapeType_SubRange.Create(Range, Self, VarType));
finally
Node.Free();
end;