mirror of
https://gitlab.com/freepascal.org/lazarus/lazarus.git
synced 2025-05-02 15:23:44 +02:00
1728 lines
49 KiB
ObjectPascal
1728 lines
49 KiB
ObjectPascal
{
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---------------------------------------------------------------------------
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FpPascalParser.pas - Native Freepascal debugger - Parse pascal expressions
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---------------------------------------------------------------------------
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***************************************************************************
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* *
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* This source is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This code is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* A copy of the GNU General Public License is available on the World *
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* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
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* obtain it by writing to the Free Software Foundation, *
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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* *
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***************************************************************************
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}
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unit FpPascalParser;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, sysutils, math, FpDbgInfo, LazLoggerBase, LazClasses;
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type
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TFpPascalExpressionPart = class;
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TFpPascalExpressionPartContainer = class;
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TFpPascalExpressionPartWithPrecedence = class;
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TFpPascalExpressionPartBracket = class;
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TFpPascalExpressionPartOperator = class;
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TFpPascalExpressionPartClass = class of TFpPascalExpressionPart;
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TFpPascalExpressionPartBracketClass = class of TFpPascalExpressionPartBracket;
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{ TFpPascalExpression }
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TFpPascalExpression = class
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private
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FError: String;
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FTextExpression: String;
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FExpressionPart: TFpPascalExpressionPart;
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FValid: Boolean;
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function GetResultValue: TDbgSymbolValue;
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procedure Parse;
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procedure SetError(AMsg: String);
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function PosFromPChar(APChar: PChar): Integer;
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protected
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function GetDbgSymbolForIdentifier({%H-}AnIdent: String): TDbgSymbol; virtual;
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property ExpressionPart: TFpPascalExpressionPart read FExpressionPart;
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public
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constructor Create(ATextExpression: String);
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destructor Destroy; override;
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function DebugDump: String;
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property Error: String read FError;
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property Valid: Boolean read FValid;
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property ResultValue: TDbgSymbolValue read GetResultValue; // May be a type, if expression is a type
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end;
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{ TFpPascalExpressionPart }
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TFpPascalExpressionPart = class
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private
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FEndChar: PChar;
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FParent: TFpPascalExpressionPartContainer;
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FStartChar: PChar;
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FExpression: TFpPascalExpression;
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FResultValue: TDbgSymbolValue;
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FResultValDone: Boolean;
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function GetResultValue: TDbgSymbolValue;
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function GetSurroundingOpenBracket: TFpPascalExpressionPartBracket;
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function GetTopParent: TFpPascalExpressionPart;
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procedure SetEndChar(AValue: PChar);
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procedure SetParent(AValue: TFpPascalExpressionPartContainer);
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procedure SetStartChar(AValue: PChar);
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procedure SetError(AMsg: String = '');
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procedure SetError(APart: TFpPascalExpressionPart; AMsg: String = '');
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protected
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function DebugText(AIndent: String): String; virtual; // Self desc only
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function DebugDump(AIndent: String): String; virtual;
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protected
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procedure Init; virtual;
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function DoGetIsTypeCast: Boolean; virtual; deprecated;
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function DoGetResultValue: TDbgSymbolValue; virtual;
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Procedure ReplaceInParent(AReplacement: TFpPascalExpressionPart);
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procedure DoHandleEndOfExpression; virtual;
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function IsValidNextPart(APart: TFpPascalExpressionPart): Boolean; virtual;
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function IsValidAfterPart({%H-}APrevPart: TFpPascalExpressionPart): Boolean; virtual;
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function MaybeHandlePrevPart({%H-}APrevPart: TFpPascalExpressionPart;
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var {%H-}AResult: TFpPascalExpressionPart): Boolean; virtual;
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// HasPrecedence: an operator with follows precedence rules: the last operand can be taken by the next operator
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function HasPrecedence: Boolean; virtual;
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function FindLeftSideOperandByPrecedence({%H-}AnOperator: TFpPascalExpressionPartWithPrecedence):
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TFpPascalExpressionPart; virtual;
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function CanHaveOperatorAsNext: Boolean; virtual; // True
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public
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constructor Create(AExpression: TFpPascalExpression; AStartChar: PChar; AnEndChar: PChar = nil);
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destructor Destroy; override;
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function HandleNextPart(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; virtual;
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procedure HandleEndOfExpression; virtual;
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function GetText(AMaxLen: Integer=0): String;
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property StartChar: PChar read FStartChar write SetStartChar;
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property EndChar: PChar read FEndChar write SetEndChar;
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property Parent: TFpPascalExpressionPartContainer read FParent write SetParent;
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property TopParent: TFpPascalExpressionPart read GetTopParent; // or self
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property SurroundingBracket: TFpPascalExpressionPartBracket read GetSurroundingOpenBracket; // incl self
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property ResultValue: TDbgSymbolValue read GetResultValue;
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end;
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{ TFpPascalExpressionPartContainer }
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TFpPascalExpressionPartContainer = class(TFpPascalExpressionPart)
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private
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FList: TList;
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function GetCount: Integer;
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function GetItems(AIndex: Integer): TFpPascalExpressionPart;
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function GetLastItem: TFpPascalExpressionPart;
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procedure SetItems(AIndex: Integer; AValue: TFpPascalExpressionPart);
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procedure SetLastItem(AValue: TFpPascalExpressionPart);
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protected
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procedure Init; override;
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function DebugDump(AIndent: String): String; override;
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public
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destructor Destroy; override;
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function Add(APart: TFpPascalExpressionPart): Integer;
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function IndexOf(APart: TFpPascalExpressionPart): Integer;
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procedure Clear;
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property Count: Integer read GetCount;
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property Items[AIndex: Integer]: TFpPascalExpressionPart read GetItems write SetItems;
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property LastItem: TFpPascalExpressionPart read GetLastItem write SetLastItem;
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end;
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{ TFpPascalExpressionPartIdentifer }
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TFpPascalExpressionPartIdentifer = class(TFpPascalExpressionPartContainer)
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protected
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function DoGetIsTypeCast: Boolean; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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end;
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TFpPascalExpressionPartConstant = class(TFpPascalExpressionPartContainer)
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end;
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{ TFpPascalExpressionPartConstantNumber }
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TFpPascalExpressionPartConstantNumber = class(TFpPascalExpressionPartConstant)
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protected
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function DoGetResultValue: TDbgSymbolValue; override;
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end;
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TFpPascalExpressionPartConstantText = class(TFpPascalExpressionPartConstant)
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end;
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{ TFpPascalExpressionPartWithPrecedence }
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TFpPascalExpressionPartWithPrecedence = class(TFpPascalExpressionPartContainer)
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protected
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FPrecedence: Integer;
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function HasPrecedence: Boolean; override;
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public
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property Precedence: Integer read FPrecedence;
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end;
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{ TFpPascalExpressionPartBracket }
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TFpPascalExpressionPartBracket = class(TFpPascalExpressionPartWithPrecedence)
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// some, but not all bracket expr have precedence
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private
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FIsClosed: boolean;
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FIsClosing: boolean;
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protected
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procedure Init; override;
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function HasPrecedence: Boolean; override;
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procedure DoHandleEndOfExpression; override;
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function CanHaveOperatorAsNext: Boolean; override;
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function HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; virtual;
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public
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procedure CloseBracket;
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function HandleNextPart(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; override;
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procedure HandleEndOfExpression; override;
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property IsClosed: boolean read FIsClosed;
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end;
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{ TFpPascalExpressionPartRoundBracket }
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TFpPascalExpressionPartRoundBracket = class(TFpPascalExpressionPartBracket)
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protected
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end;
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{ TFpPascalExpressionPartBracketSubExpression }
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TFpPascalExpressionPartBracketSubExpression = class(TFpPascalExpressionPartRoundBracket)
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protected
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function HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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end;
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{ TFpPascalExpressionPartBracketArgumentList }
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TFpPascalExpressionPartBracketArgumentList = class(TFpPascalExpressionPartRoundBracket)
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// function arguments or type cast // this acts a operator: first element is the function/type
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protected
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procedure Init; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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function DoGetIsTypeCast: Boolean; override;
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function IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean; override;
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function HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; override;
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function MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
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var AResult: TFpPascalExpressionPart): Boolean; override;
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end;
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TFpPascalExpressionPartSquareBracket = class(TFpPascalExpressionPartBracket)
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protected
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end;
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{ TFpPascalExpressionPartBracketSet }
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TFpPascalExpressionPartBracketSet = class(TFpPascalExpressionPartSquareBracket)
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// a in [x, y, z]
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protected
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function HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; override;
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end;
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{ TFpPascalExpressionPartBracketIndex }
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TFpPascalExpressionPartBracketIndex = class(TFpPascalExpressionPartSquareBracket)
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// array[1]
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protected
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procedure Init; override;
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//function DoGetResultType: TDbgSymbol; override;
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function IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean; override;
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function HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; override;
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function MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
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var AResult: TFpPascalExpressionPart): Boolean; override;
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end;
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{ TFpPascalExpressionPartOperator }
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TFpPascalExpressionPartOperator = class(TFpPascalExpressionPartWithPrecedence)
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protected
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function DebugText(AIndent: String): String; override;
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function CanHaveOperatorAsNext: Boolean; override;
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function FindLeftSideOperandByPrecedence(AnOperator: TFpPascalExpressionPartWithPrecedence):
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TFpPascalExpressionPart; override;
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function HasAllOperands: Boolean; virtual; abstract;
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function MaybeAddLeftOperand(APrevPart: TFpPascalExpressionPart;
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var AResult: TFpPascalExpressionPart): Boolean;
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procedure DoHandleEndOfExpression; override;
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public
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function HandleNextPart(APart: TFpPascalExpressionPart): TFpPascalExpressionPart; override;
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end;
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{ TFpPascalExpressionPartUnaryOperator }
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TFpPascalExpressionPartUnaryOperator = class(TFpPascalExpressionPartOperator)
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protected
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function HasAllOperands: Boolean; override;
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public
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end;
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{ TFpPascalExpressionPartBinaryOperator }
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TFpPascalExpressionPartBinaryOperator = class(TFpPascalExpressionPartOperator)
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protected
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function HasAllOperands: Boolean; override;
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function IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean; override;
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public
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function MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
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var AResult: TFpPascalExpressionPart): Boolean; override;
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end;
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{ TFpPascalExpressionPartOperatorAddressOf }
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TFpPascalExpressionPartOperatorAddressOf = class(TFpPascalExpressionPartUnaryOperator) // @
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protected
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procedure Init; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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end;
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{ TFpPascalExpressionPartOperatorMakeRef }
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TFpPascalExpressionPartOperatorMakeRef = class(TFpPascalExpressionPartUnaryOperator) // ^TTYpe
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protected
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procedure Init; override;
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function IsValidNextPart(APart: TFpPascalExpressionPart): Boolean; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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function DoGetIsTypeCast: Boolean; override;
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end;
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{ TFpPascalExpressionPartOperatorDeRef }
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TFpPascalExpressionPartOperatorDeRef = class(TFpPascalExpressionPartUnaryOperator) // ptrval^
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protected
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procedure Init; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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function MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
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var AResult: TFpPascalExpressionPart): Boolean; override;
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function FindLeftSideOperandByPrecedence({%H-}AnOperator: TFpPascalExpressionPartWithPrecedence):
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TFpPascalExpressionPart;
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override;
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// IsValidAfterPart: same as binary op
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function IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean; override;
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end;
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{ TFpPascalExpressionPartOperatorUnaryPlusMinus }
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TFpPascalExpressionPartOperatorUnaryPlusMinus = class(TFpPascalExpressionPartUnaryOperator) // + -
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// Unary + -
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protected
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procedure Init; override;
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end;
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{ TFpPascalExpressionPartOperatorPlusMinus }
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TFpPascalExpressionPartOperatorPlusMinus = class(TFpPascalExpressionPartBinaryOperator) // + -
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// Binary + -
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protected
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procedure Init; override;
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end;
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{ TFpPascalExpressionPartOperatorMulDiv }
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TFpPascalExpressionPartOperatorMulDiv = class(TFpPascalExpressionPartBinaryOperator) // * /
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protected
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procedure Init; override;
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end;
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{ TFpPascalExpressionPartOperatorMemberOf }
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TFpPascalExpressionPartOperatorMemberOf = class(TFpPascalExpressionPartBinaryOperator) // struct.member
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protected
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procedure Init; override;
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function IsValidNextPart(APart: TFpPascalExpressionPart): Boolean; override;
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function DoGetResultValue: TDbgSymbolValue; override;
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end;
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implementation
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const
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// 1 highest
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PRECEDENCE_MEMBER_OF = 1; // foo.bar
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PRECEDENCE_MAKE_REF = 1; // ^TFoo
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PRECEDENCE_ARG_LIST = 2; // foo() / TFoo()
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PRECEDENCE_ARRAY_IDX = 2; // foo[1]
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PRECEDENCE_DEREF = 5; // a^ // Precedence acts only to the left side
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PRECEDENCE_ADRESS_OF = 6; // @a
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//PRECEDENCE_POWER = 10; // ** (power) must be stronger than unary -
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PRECEDENCE_UNARY_SIGN = 11; // -a
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PRECEDENCE_MUL_DIV = 12; // a * b
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PRECEDENCE_PLUS_MINUS = 13; // a + b
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type
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{ TPasParserSymbolPointer }
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TPasParserSymbolPointer = class(TDbgSymbol)
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private
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FPointedTo: TDbgSymbol;
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protected
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// NameNeeded // "^TPointedTo"
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procedure TypeInfoNeeded; override;
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public
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constructor Create(const APointedTo: TDbgSymbol);
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destructor Destroy; override;
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end;
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{ TPasParserSymbolArrayDeIndex }
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TPasParserSymbolArrayDeIndex = class(TDbgSymbolForwarder) // 1 index level off
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private
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FArray: TDbgSymbol;
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protected
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//procedure ForwardToSymbolNeeded; override;
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function GetMemberCount: Integer; override;
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function GetMember(AIndex: Integer): TDbgSymbol; override;
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public
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constructor Create(const AnArray: TDbgSymbol);
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destructor Destroy; override;
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end;
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{ TPasParserWrapperSymbolValue }
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TPasParserWrapperSymbolValue = class(TDbgSymbolValue)
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private
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FSymbol: TDbgSymbol;
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protected
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function GetKind: TDbgSymbolKind; override;
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//function GetFieldFlags: TDbgSymbolValueFieldFlags; override; // should be a type, not value
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function GetDbgSymbol: TDbgSymbol; override;
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public
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constructor Create(ATypeInfo: TDbgSymbol);
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destructor Destroy; override;
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end;
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{ TPasParserConstNumberSymbolValue }
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TPasParserConstNumberSymbolValue = class(TDbgSymbolValue)
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private
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FValue: QWord;
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FSigned: Boolean;
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protected
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function GetKind: TDbgSymbolKind; override;
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function GetFieldFlags: TDbgSymbolValueFieldFlags; override;
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function GetAsCardinal: QWord; override;
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function GetAsInteger: Int64; override;
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public
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constructor Create(AValue: QWord; ASigned: Boolean = False);
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end;
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{ TPasParserAddressOfSymbolValue }
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TPasParserAddressOfSymbolValue = class(TDbgSymbolValue)
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private
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FValue: TDbgSymbolValue;
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FTypeInfo: TDbgSymbol;
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function GetPointedToValue: TDbgSymbolValue;
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protected
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function GetKind: TDbgSymbolKind; override;
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function GetFieldFlags: TDbgSymbolValueFieldFlags; override;
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function GetAsInteger: Int64; override;
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function GetAsCardinal: QWord; override;
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function GetTypeInfo: TDbgSymbol; override;
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public
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constructor Create(AValue: TDbgSymbolValue);
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destructor Destroy; override;
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property PointedToValue: TDbgSymbolValue read GetPointedToValue;
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end;
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{ TPasParserAddressOfSymbolValue }
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function TPasParserAddressOfSymbolValue.GetPointedToValue: TDbgSymbolValue;
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begin
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Result := FValue;
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end;
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function TPasParserAddressOfSymbolValue.GetKind: TDbgSymbolKind;
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begin
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Result := skPointer;
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end;
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function TPasParserAddressOfSymbolValue.GetFieldFlags: TDbgSymbolValueFieldFlags;
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begin
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Result := Result + [svfOrdinal, svfSizeOfPointer];
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end;
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function TPasParserAddressOfSymbolValue.GetAsInteger: Int64;
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begin
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Result := Int64(FValue.Address);
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end;
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function TPasParserAddressOfSymbolValue.GetAsCardinal: QWord;
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begin
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Result := QWord(FValue.Address);
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end;
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function TPasParserAddressOfSymbolValue.GetTypeInfo: TDbgSymbol;
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begin
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Result := FTypeInfo;
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if Result <> nil then
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exit;
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if FValue.TypeInfo = nil then
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exit;
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FTypeInfo := TPasParserSymbolPointer.Create(FValue.TypeInfo);
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{$IFDEF WITH_REFCOUNT_DEBUG}FTypeInfo.DbgRenameReference(@FTypeInfo, 'TPasParserAddressOfSymbolValue');{$ENDIF}
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Result := FTypeInfo;
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end;
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constructor TPasParserAddressOfSymbolValue.Create(AValue: TDbgSymbolValue);
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begin
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inherited Create;
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FValue := AValue;
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FValue.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(@FValue, 'TPasParserAddressOfSymbolValue'){$ENDIF};
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end;
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destructor TPasParserAddressOfSymbolValue.Destroy;
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begin
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inherited Destroy;
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FValue.ReleaseReference{$IFDEF WITH_REFCOUNT_DEBUG}(@FValue, 'TPasParserAddressOfSymbolValue'){$ENDIF};
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FTypeInfo.ReleaseReference{$IFDEF WITH_REFCOUNT_DEBUG}(@FTypeInfo, 'TPasParserAddressOfSymbolValue'){$ENDIF};
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end;
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{ TPasParserConstNumberSymbolValue }
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function TPasParserConstNumberSymbolValue.GetKind: TDbgSymbolKind;
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begin
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if FSigned then
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|
Result := skInteger
|
|
else
|
|
Result := skCardinal;
|
|
end;
|
|
|
|
function TPasParserConstNumberSymbolValue.GetFieldFlags: TDbgSymbolValueFieldFlags;
|
|
begin
|
|
if FSigned then
|
|
Result := Result + [svfOrdinal, svfInteger]
|
|
else
|
|
Result := Result + [svfOrdinal, svfCardinal];
|
|
end;
|
|
|
|
function TPasParserConstNumberSymbolValue.GetAsCardinal: QWord;
|
|
begin
|
|
Result := FValue;
|
|
end;
|
|
|
|
function TPasParserConstNumberSymbolValue.GetAsInteger: Int64;
|
|
begin
|
|
Result := Int64(FValue);
|
|
end;
|
|
|
|
constructor TPasParserConstNumberSymbolValue.Create(AValue: QWord; ASigned: Boolean);
|
|
begin
|
|
inherited Create;
|
|
FValue := AValue;
|
|
FSigned := ASigned;
|
|
end;
|
|
|
|
{ TPasParserTypeCastSymbolValue }
|
|
|
|
function TPasParserWrapperSymbolValue.GetKind: TDbgSymbolKind;
|
|
begin
|
|
Result := skNone;
|
|
end;
|
|
|
|
function TPasParserWrapperSymbolValue.GetDbgSymbol: TDbgSymbol;
|
|
begin
|
|
Result := FSymbol;
|
|
end;
|
|
|
|
constructor TPasParserWrapperSymbolValue.Create(ATypeInfo: TDbgSymbol);
|
|
begin
|
|
inherited Create;
|
|
FSymbol := ATypeInfo;
|
|
FSymbol.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(@FSymbol, 'TPasParserWrapperSymbolValue'){$ENDIF};
|
|
end;
|
|
|
|
destructor TPasParserWrapperSymbolValue.Destroy;
|
|
begin
|
|
inherited Destroy;
|
|
FSymbol.ReleaseReference{$IFDEF WITH_REFCOUNT_DEBUG}(@FSymbol, 'TPasParserWrapperSymbolValue'){$ENDIF};
|
|
end;
|
|
|
|
{ TPasParserSymbolArrayDeIndex }
|
|
|
|
function TPasParserSymbolArrayDeIndex.GetMemberCount: Integer;
|
|
begin
|
|
Result := (inherited GetMemberCount) - 1;
|
|
end;
|
|
|
|
function TPasParserSymbolArrayDeIndex.GetMember(AIndex: Integer): TDbgSymbol;
|
|
begin
|
|
Result := inherited GetMember(AIndex + 1);
|
|
end;
|
|
|
|
constructor TPasParserSymbolArrayDeIndex.Create(const AnArray: TDbgSymbol);
|
|
begin
|
|
FArray := AnArray;
|
|
FArray.AddReference;
|
|
inherited Create('');
|
|
SetKind(skArray);
|
|
SetForwardToSymbol(FArray);
|
|
end;
|
|
|
|
destructor TPasParserSymbolArrayDeIndex.Destroy;
|
|
begin
|
|
ReleaseRefAndNil(FArray);
|
|
inherited Destroy;
|
|
end;
|
|
|
|
{ TPasParserSymbolPointer }
|
|
|
|
procedure TPasParserSymbolPointer.TypeInfoNeeded;
|
|
begin
|
|
SetTypeInfo(FPointedTo);
|
|
end;
|
|
|
|
constructor TPasParserSymbolPointer.Create(const APointedTo: TDbgSymbol);
|
|
begin
|
|
FPointedTo := APointedTo;
|
|
FPointedTo.AddReference;
|
|
inherited Create('');
|
|
SetKind(skPointer);
|
|
end;
|
|
|
|
destructor TPasParserSymbolPointer.Destroy;
|
|
begin
|
|
ReleaseRefAndNil(FPointedTo);
|
|
inherited Destroy;
|
|
end;
|
|
|
|
|
|
{ TFpPascalExpressionPartBracketIndex }
|
|
|
|
procedure TFpPascalExpressionPartBracketIndex.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_ARRAY_IDX;
|
|
inherited Init;
|
|
end;
|
|
|
|
//function TFpPascalExpressionPartBracketIndex.DoGetResultType: TDbgSymbol;
|
|
//var
|
|
// tmp: TDbgSymbol;
|
|
//begin
|
|
// Result := nil;
|
|
// if Count <> 2 then exit;
|
|
//
|
|
// tmp := Items[0].ResultType;
|
|
// if tmp = nil then exit;
|
|
//
|
|
// if (tmp.Kind = skArray) then begin
|
|
// // TODO: check type of index
|
|
// if tmp.MemberCount < 1 then exit; // TODO error
|
|
// if tmp.MemberCount = 1 then begin
|
|
// Result := tmp.TypeInfo;
|
|
// Result.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultType'){$ENDIF};
|
|
// exit;
|
|
// end;
|
|
//
|
|
// Result := TPasParserSymbolArrayDeIndex.Create(tmp);
|
|
// end
|
|
// else
|
|
// if (tmp.Kind = skPointer) then begin
|
|
// Result := tmp.TypeInfo;
|
|
// Result.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultType'){$ENDIF};
|
|
// exit;
|
|
// end
|
|
// else
|
|
// if (tmp.Kind = skString) then begin
|
|
// //TODO
|
|
// exit;
|
|
// end;
|
|
//end;
|
|
|
|
function TFpPascalExpressionPartBracketIndex.IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := inherited IsValidAfterPart(APrevPart);
|
|
Result := Result and APrevPart.CanHaveOperatorAsNext;
|
|
if (APrevPart.Parent <> nil) and (APrevPart.Parent.HasPrecedence) then
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketIndex.HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
if Count <> 1 then begin // Todo a,b,c
|
|
SetError(APart, 'Too many operands in [] '+GetText+': ');
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
if not IsValidNextPart(APart) then begin
|
|
SetError(APart, 'Invalid operand in [] '+GetText+': ');
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
|
|
Add(APart);
|
|
Result := APart;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketIndex.MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
|
|
var AResult: TFpPascalExpressionPart): Boolean;
|
|
var
|
|
ALeftSide: TFpPascalExpressionPart;
|
|
begin
|
|
//Result := MaybeAddLeftOperand(APrevPart, AResult);
|
|
|
|
Result := APrevPart.IsValidNextPart(Self);
|
|
if not Result then
|
|
exit;
|
|
|
|
AResult := Self;
|
|
if (Count > 0) // function/type already set
|
|
then begin
|
|
SetError(APrevPart, 'Parse error in () '+GetText+': ');
|
|
APrevPart.Free;
|
|
exit;
|
|
end;
|
|
|
|
ALeftSide := APrevPart.FindLeftSideOperandByPrecedence(Self);
|
|
if ALeftSide = nil then begin
|
|
SetError(Self, 'Internal parser error for operator '+GetText+': ');
|
|
APrevPart.Free;
|
|
exit;
|
|
end;
|
|
|
|
ALeftSide.ReplaceInParent(Self);
|
|
Add(ALeftSide);
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartBracketSet }
|
|
|
|
function TFpPascalExpressionPartBracketSet.HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
if Count > 0 then begin
|
|
SetError('To many expressions'); // TODO comma
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
|
|
Result := APart;
|
|
Add(APart);
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartWithPrecedence }
|
|
|
|
function TFpPascalExpressionPartWithPrecedence.HasPrecedence: Boolean;
|
|
begin
|
|
Result := True;
|
|
end;
|
|
|
|
|
|
{ TFpPascalExpressionPartBracketArgumentList }
|
|
|
|
procedure TFpPascalExpressionPartBracketArgumentList.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_ARG_LIST;
|
|
inherited Init;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketArgumentList.DoGetResultValue: TDbgSymbolValue;
|
|
var
|
|
tmp: TDbgSymbolValue;
|
|
begin
|
|
Result := nil;
|
|
|
|
if (Count = 2) then begin
|
|
Result := Items[0].ResultValue;
|
|
if (Result <> nil) and (Result.DbgSymbol <> nil) and
|
|
(Result.DbgSymbol.SymbolType = stType)
|
|
then begin
|
|
// This is a typecast
|
|
tmp := Items[1].ResultValue;
|
|
if tmp <> nil then
|
|
Result := Result.DbgSymbol.TypeCastValue(tmp);
|
|
if Result <> nil then
|
|
{$IFDEF WITH_REFCOUNT_DEBUG}Result.DbgRenameReference(nil, 'DoGetResultValue'){$ENDIF};
|
|
exit;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketArgumentList.DoGetIsTypeCast: Boolean;
|
|
begin
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketArgumentList.IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := inherited IsValidAfterPart(APrevPart);
|
|
Result := Result and APrevPart.CanHaveOperatorAsNext;
|
|
if (APrevPart.Parent <> nil) and (APrevPart.Parent.HasPrecedence) then
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketArgumentList.HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
if Count <> 1 then begin // Todo a,b,c
|
|
SetError(APart, 'Too many operands in () '+GetText+': ');
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
if not IsValidNextPart(APart) then begin
|
|
SetError(APart, 'Invalid operand in () '+GetText+': ');
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
|
|
Add(APart);
|
|
Result := APart;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketArgumentList.MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
|
|
var AResult: TFpPascalExpressionPart): Boolean;
|
|
var
|
|
ALeftSide: TFpPascalExpressionPart;
|
|
begin
|
|
//Result := MaybeAddLeftOperand(APrevPart, AResult);
|
|
|
|
Result := APrevPart.IsValidNextPart(Self);
|
|
if not Result then
|
|
exit;
|
|
|
|
AResult := Self;
|
|
if (Count > 0) // function/type already set
|
|
then begin
|
|
SetError(APrevPart, 'Parse error in () '+GetText+': ');
|
|
APrevPart.Free;
|
|
exit;
|
|
end;
|
|
|
|
ALeftSide := APrevPart.FindLeftSideOperandByPrecedence(Self);
|
|
if ALeftSide = nil then begin
|
|
SetError(Self, 'Internal parser error for operator '+GetText+': ');
|
|
APrevPart.Free;
|
|
exit;
|
|
end;
|
|
|
|
ALeftSide.ReplaceInParent(Self);
|
|
Add(ALeftSide);
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartBracketSubExpression }
|
|
|
|
function TFpPascalExpressionPartBracketSubExpression.HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
if Count > 0 then begin
|
|
SetError('To many expressions');
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
|
|
Result := APart;
|
|
Add(APart);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracketSubExpression.DoGetResultValue: TDbgSymbolValue;
|
|
begin
|
|
if Count <> 1 then
|
|
Result := nil
|
|
else
|
|
Result := Items[0].ResultValue;
|
|
if Result <> nil then
|
|
Result.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultValue'){$ENDIF};
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartIdentifer }
|
|
|
|
function TFpPascalExpressionPartIdentifer.DoGetIsTypeCast: Boolean;
|
|
begin
|
|
Result := (ResultValue <> nil) and (ResultValue.DbgSymbol <> nil) and (ResultValue.DbgSymbol.SymbolType = stType);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartIdentifer.DoGetResultValue: TDbgSymbolValue;
|
|
var
|
|
DbgSymbol: TDbgSymbol;
|
|
begin
|
|
Result := nil;
|
|
DbgSymbol := FExpression.GetDbgSymbolForIdentifier(GetText);
|
|
if DbgSymbol = nil then
|
|
exit;
|
|
|
|
Result := DbgSymbol.Value;
|
|
if Result = nil then begin
|
|
Result := TPasParserWrapperSymbolValue.Create(DbgSymbol);
|
|
{$IFDEF WITH_REFCOUNT_DEBUG}Result.DbgRenameReference(nil, 'DoGetResultValue'){$ENDIF};
|
|
end
|
|
else
|
|
Result.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultValue'){$ENDIF};
|
|
|
|
DbgSymbol.ReleaseReference; // hold via value
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartConstantNumber }
|
|
|
|
function TFpPascalExpressionPartConstantNumber.DoGetResultValue: TDbgSymbolValue;
|
|
begin
|
|
Result := TPasParserConstNumberSymbolValue.Create(StrToQWordDef(GetText, 0));
|
|
{$IFDEF WITH_REFCOUNT_DEBUG}Result.DbgRenameReference(nil, 'DoGetResultValue'){$ENDIF};
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorUnaryPlusMinus }
|
|
|
|
procedure TFpPascalExpressionPartOperatorUnaryPlusMinus.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_UNARY_SIGN;
|
|
inherited Init;
|
|
end;
|
|
|
|
{ TFpPascalExpression }
|
|
|
|
procedure TFpPascalExpression.Parse;
|
|
var
|
|
CurPtr, EndPtr, TokenEndPtr: PChar;
|
|
CurPart, NewPart: TFpPascalExpressionPart;
|
|
|
|
procedure AddPart(AClass: TFpPascalExpressionPartClass);
|
|
begin
|
|
NewPart := AClass.Create(Self, CurPtr, TokenEndPtr-1);
|
|
end;
|
|
|
|
procedure AddPlusMinus;
|
|
begin
|
|
if (CurPart = nil) or (not CurPart.CanHaveOperatorAsNext)
|
|
then AddPart(TFpPascalExpressionPartOperatorUnaryPlusMinus)
|
|
else AddPart(TFpPascalExpressionPartOperatorPlusMinus);
|
|
end;
|
|
|
|
procedure AddIdentifier;
|
|
begin
|
|
while TokenEndPtr^ in ['a'..'z', 'A'..'Z', '_', '0'..'9'] do
|
|
inc(TokenEndPtr);
|
|
// TODO: Check functions not, and, in, as, is ...
|
|
NewPart := TFpPascalExpressionPartIdentifer.Create(Self, CurPtr, TokenEndPtr-1);
|
|
end;
|
|
|
|
procedure HandleDot;
|
|
begin
|
|
while TokenEndPtr^ = '.' do
|
|
inc(TokenEndPtr);
|
|
case TokenEndPtr - CurPtr of
|
|
1: AddPart(TFpPascalExpressionPartOperatorMemberOf);
|
|
//2: ; // ".."
|
|
else SetError('Failed parsing ...');
|
|
end;
|
|
end;
|
|
|
|
procedure AddRefOperator;
|
|
begin
|
|
if (CurPart = nil) or (not CurPart.CanHaveOperatorAsNext)
|
|
then AddPart(TFpPascalExpressionPartOperatorMakeRef)
|
|
else AddPart(TFpPascalExpressionPartOperatorDeRef);
|
|
end;
|
|
|
|
procedure HandleRoundBracket;
|
|
begin
|
|
if (CurPart = nil) or (not CurPart.CanHaveOperatorAsNext)
|
|
then AddPart(TFpPascalExpressionPartBracketSubExpression)
|
|
else AddPart(TFpPascalExpressionPartBracketArgumentList);
|
|
end;
|
|
|
|
procedure HandleSqareBracket;
|
|
begin
|
|
if (CurPart = nil) or (not CurPart.CanHaveOperatorAsNext)
|
|
then AddPart(TFpPascalExpressionPartBracketSet)
|
|
else AddPart(TFpPascalExpressionPartBracketIndex);
|
|
end;
|
|
|
|
procedure CloseBracket(ABracketClass: TFpPascalExpressionPartBracketClass);
|
|
var
|
|
BracketPart: TFpPascalExpressionPartBracket;
|
|
begin
|
|
BracketPart := CurPart.SurroundingBracket;
|
|
if BracketPart = nil then begin
|
|
SetError('Closing bracket found without opening')
|
|
end
|
|
else
|
|
if not (BracketPart is ABracketClass) then begin
|
|
SetError('Mismatch bracket')
|
|
end
|
|
else begin
|
|
TFpPascalExpressionPartBracket(BracketPart).CloseBracket;
|
|
CurPart := BracketPart;
|
|
end;
|
|
end;
|
|
|
|
procedure AddConstNumber;
|
|
begin
|
|
case CurPtr^ of
|
|
'$': while TokenEndPtr^ in ['a'..'z', 'A'..'Z', '0'..'9'] do inc(TokenEndPtr);
|
|
'&': while TokenEndPtr^ in ['0'..'7'] do inc(TokenEndPtr);
|
|
'%': while TokenEndPtr^ in ['0'..'1'] do inc(TokenEndPtr);
|
|
'0'..'9':
|
|
if (CurPtr^ = '0') and ((CurPtr + 1)^ in ['x', 'X']) and
|
|
((CurPtr + 2)^ in ['a'..'z', 'A'..'Z', '0'..'9'])
|
|
then begin
|
|
inc(TokenEndPtr, 2);
|
|
while TokenEndPtr^ in ['a'..'z', 'A'..'Z', '0'..'9'] do inc(TokenEndPtr);
|
|
end
|
|
else
|
|
while TokenEndPtr^ in ['0'..'9'] do inc(TokenEndPtr);
|
|
end;
|
|
AddPart(TFpPascalExpressionPartConstantNumber);
|
|
end;
|
|
|
|
procedure AddConstChar;
|
|
begin
|
|
SetError(Format('Unexpected char ''%0:s'' at pos %1:d', [CurPtr^, PosFromPChar(CurPtr)])); // error
|
|
end;
|
|
|
|
begin
|
|
if FTextExpression = '' then
|
|
exit;
|
|
CurPtr := @FTextExpression[1];
|
|
EndPtr := CurPtr + length(FTextExpression);
|
|
CurPart := nil;
|
|
|
|
While (CurPtr < EndPtr) and FValid do begin
|
|
if CurPtr^ in [' ', #9, #10, #13] then begin
|
|
while (CurPtr^ in [' ', #9, #10, #13]) and (CurPtr < EndPtr) do
|
|
Inc(CurPtr);
|
|
continue;
|
|
end;
|
|
|
|
NewPart := nil;
|
|
TokenEndPtr := CurPtr + 1;
|
|
case CurPtr^ of
|
|
'@' : AddPart(TFpPascalExpressionPartOperatorAddressOf);
|
|
'^': AddRefOperator; // ^A may be #$01
|
|
'.': HandleDot;
|
|
'+', '-' : AddPlusMinus;
|
|
'*', '/' : AddPart(TFpPascalExpressionPartOperatorMulDiv);
|
|
'(': HandleRoundBracket;
|
|
')': CloseBracket(TFpPascalExpressionPartRoundBracket);
|
|
'[': HandleSqareBracket;
|
|
']': CloseBracket(TFpPascalExpressionPartSquareBracket);
|
|
//',': ;
|
|
'''', '#': AddConstChar;
|
|
'0'..'9',
|
|
'$', '%', '&': AddConstNumber;
|
|
'a'..'z',
|
|
'A'..'Z', '_': AddIdentifier;
|
|
else begin
|
|
SetError(Format('Unexpected char ''%0:s'' at pos %1:d', [CurPtr^, PosFromPChar(CurPtr)])); // error
|
|
break;
|
|
end;
|
|
end;
|
|
if not FValid then
|
|
break;
|
|
|
|
if CurPart = nil then
|
|
CurPart := NewPart
|
|
else
|
|
if NewPart <> nil then
|
|
CurPart := CurPart.HandleNextPart(NewPart);
|
|
|
|
CurPtr := TokenEndPtr;
|
|
end; // While CurPtr < EndPtr do begin
|
|
|
|
|
|
|
|
if CurPart <> nil then begin
|
|
CurPart.HandleEndOfExpression;
|
|
CurPart := CurPart.TopParent;
|
|
end
|
|
else
|
|
if Valid then
|
|
SetError('No Expression');
|
|
|
|
FExpressionPart := CurPart;
|
|
end;
|
|
|
|
function TFpPascalExpression.GetResultValue: TDbgSymbolValue;
|
|
begin
|
|
if (FExpressionPart = nil) or (not Valid) then
|
|
Result := nil
|
|
else
|
|
Result := FExpressionPart.ResultValue;
|
|
end;
|
|
|
|
procedure TFpPascalExpression.SetError(AMsg: String);
|
|
begin
|
|
FValid := False;
|
|
FError := AMsg;
|
|
DebugLn(['PARSER ERROR ', AMsg]);
|
|
end;
|
|
|
|
function TFpPascalExpression.PosFromPChar(APChar: PChar): Integer;
|
|
begin
|
|
Result := APChar - @FTextExpression[1] + 1;
|
|
end;
|
|
|
|
function TFpPascalExpression.GetDbgSymbolForIdentifier(AnIdent: String): TDbgSymbol;
|
|
begin
|
|
Result := nil;
|
|
end;
|
|
|
|
constructor TFpPascalExpression.Create(ATextExpression: String);
|
|
begin
|
|
FTextExpression := ATextExpression;
|
|
FValid := True;
|
|
Parse;
|
|
end;
|
|
|
|
destructor TFpPascalExpression.Destroy;
|
|
begin
|
|
FreeAndNil(FExpressionPart);
|
|
inherited Destroy;
|
|
end;
|
|
|
|
function TFpPascalExpression.DebugDump: String;
|
|
begin
|
|
Result := 'TFpPascalExpression: ' + FTextExpression + LineEnding +
|
|
'Valid: ' + dbgs(FValid) + ' Error: "' + FError + '"'+ LineEnding
|
|
;
|
|
if FExpressionPart <> nil then
|
|
Result := Result + FExpressionPart.DebugDump(' ');
|
|
end;
|
|
|
|
{ TFpPascalExpressionPart }
|
|
|
|
procedure TFpPascalExpressionPart.SetEndChar(AValue: PChar);
|
|
begin
|
|
if FEndChar = AValue then Exit;
|
|
FEndChar := AValue;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.GetTopParent: TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
while Result.Parent <> nil do
|
|
Result := Result.Parent;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.GetSurroundingOpenBracket: TFpPascalExpressionPartBracket;
|
|
var
|
|
tmp: TFpPascalExpressionPart;
|
|
begin
|
|
Result := nil;
|
|
tmp := Self;
|
|
while (tmp <> nil) and
|
|
( not(tmp is TFpPascalExpressionPartBracket) or ((tmp as TFpPascalExpressionPartBracket).IsClosed) )
|
|
do
|
|
tmp := tmp.Parent;
|
|
if tmp <> nil then
|
|
Result := TFpPascalExpressionPartBracket(tmp);
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.GetResultValue: TDbgSymbolValue;
|
|
begin
|
|
Result := FResultValue;
|
|
if FResultValDone then
|
|
exit;
|
|
FResultValue := DoGetResultValue;
|
|
FResultValDone := True;
|
|
Result := FResultValue;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.SetParent(AValue: TFpPascalExpressionPartContainer);
|
|
begin
|
|
if FParent = AValue then Exit;
|
|
FParent := AValue;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.SetStartChar(AValue: PChar);
|
|
begin
|
|
if FStartChar = AValue then Exit;
|
|
FStartChar := AValue;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.GetText(AMaxLen: Integer): String;
|
|
var
|
|
Len: Integer;
|
|
begin
|
|
if FEndChar <> nil
|
|
then Len := FEndChar - FStartChar + 1
|
|
else Len := min(AMaxLen, 10);
|
|
if (AMaxLen > 0) and (Len > AMaxLen) then
|
|
Len := AMaxLen;
|
|
Result := Copy(FStartChar, 1, Len);
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.SetError(AMsg: String);
|
|
begin
|
|
if AMsg = '' then
|
|
AMsg := 'Invalid Expression';
|
|
FExpression.SetError(Format('%0:s at %1:d: "%2:s"', [AMsg, FExpression.PosFromPChar(FStartChar), GetText(20)]));
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.SetError(APart: TFpPascalExpressionPart; AMsg: String);
|
|
begin
|
|
if APart <> nil
|
|
then APart.SetError(AMsg)
|
|
else Self.SetError(AMsg);
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.Init;
|
|
begin
|
|
//
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.DoGetIsTypeCast: Boolean;
|
|
begin
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.DoGetResultValue: TDbgSymbolValue;
|
|
begin
|
|
Result := nil;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.ReplaceInParent(AReplacement: TFpPascalExpressionPart);
|
|
var
|
|
i: Integer;
|
|
begin
|
|
if Parent = nil then exit;
|
|
i := Parent.IndexOf(Self);
|
|
Assert(i >= 0);
|
|
Parent.Items[i] := AReplacement;
|
|
Parent := nil;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.DoHandleEndOfExpression;
|
|
begin
|
|
//
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.IsValidNextPart(APart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := APart.IsValidAfterPart(Self);
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := True;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
|
|
var AResult: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.HasPrecedence: Boolean;
|
|
begin
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.FindLeftSideOperandByPrecedence(AnOperator: TFpPascalExpressionPartWithPrecedence): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.CanHaveOperatorAsNext: Boolean;
|
|
begin
|
|
Result := True;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.DebugText(AIndent: String): String;
|
|
begin
|
|
Result := Format('%s%s at %d: "%s"',
|
|
[AIndent, ClassName, FExpression.PosFromPChar(FStartChar), GetText])
|
|
+ LineEnding;
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.DebugDump(AIndent: String): String;
|
|
begin
|
|
Result := DebugText(AIndent);
|
|
end;
|
|
|
|
constructor TFpPascalExpressionPart.Create(AExpression: TFpPascalExpression; AStartChar: PChar;
|
|
AnEndChar: PChar);
|
|
begin
|
|
FExpression := AExpression;
|
|
FStartChar := AStartChar;
|
|
FEndChar := AnEndChar;
|
|
//FResultTypeFlag := rtUnknown;
|
|
FResultValDone := False;
|
|
Init;
|
|
end;
|
|
|
|
destructor TFpPascalExpressionPart.Destroy;
|
|
begin
|
|
inherited Destroy;
|
|
//FResultType.ReleaseReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultType'){$ENDIF};
|
|
FResultValue.ReleaseReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultValue'){$ENDIF};
|
|
end;
|
|
|
|
function TFpPascalExpressionPart.HandleNextPart(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := APart;
|
|
if APart.MaybeHandlePrevPart(Self, Result) then
|
|
exit;
|
|
|
|
if Parent <> nil then begin
|
|
Result := Parent.HandleNextPart(APart);
|
|
exit;
|
|
end;
|
|
|
|
SetError(APart, 'Unexpected ');
|
|
APart.Free;
|
|
Result := Self;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPart.HandleEndOfExpression;
|
|
begin
|
|
DoHandleEndOfExpression;
|
|
if Parent <> nil then
|
|
Parent.HandleEndOfExpression;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartContainer }
|
|
|
|
function TFpPascalExpressionPartContainer.GetItems(AIndex: Integer): TFpPascalExpressionPart;
|
|
begin
|
|
Result := TFpPascalExpressionPart(FList[AIndex]);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartContainer.GetLastItem: TFpPascalExpressionPart;
|
|
begin
|
|
if Count > 0 then
|
|
Result := Items[Count - 1]
|
|
else
|
|
Result := nil;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartContainer.SetItems(AIndex: Integer;
|
|
AValue: TFpPascalExpressionPart);
|
|
begin
|
|
AValue.Parent := Self;
|
|
FList[AIndex] := AValue;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartContainer.SetLastItem(AValue: TFpPascalExpressionPart);
|
|
begin
|
|
assert(Count >0);
|
|
Items[Count-1] := AValue;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartContainer.Init;
|
|
begin
|
|
FList := TList.Create;
|
|
inherited Init;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartContainer.DebugDump(AIndent: String): String;
|
|
var
|
|
i: Integer;
|
|
begin
|
|
Result := inherited DebugDump(AIndent);
|
|
for i := 0 to Count - 1 do
|
|
Result := Result + Items[i].DebugDump(AIndent+' ');
|
|
end;
|
|
|
|
function TFpPascalExpressionPartContainer.GetCount: Integer;
|
|
begin
|
|
Result := FList.Count;
|
|
end;
|
|
|
|
destructor TFpPascalExpressionPartContainer.Destroy;
|
|
begin
|
|
Clear;
|
|
FreeAndNil(FList);
|
|
inherited Destroy;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartContainer.Add(APart: TFpPascalExpressionPart): Integer;
|
|
begin
|
|
APart.Parent := Self;
|
|
Result := FList.Add(APart);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartContainer.IndexOf(APart: TFpPascalExpressionPart): Integer;
|
|
begin
|
|
Result := Count - 1;
|
|
while (Result >= 0) and (Items[Result] <> APart) do
|
|
dec(Result);
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartContainer.Clear;
|
|
begin
|
|
while Count > 0 do begin
|
|
Items[0].Free;
|
|
FList.Delete(0);
|
|
end;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartBracket }
|
|
|
|
procedure TFpPascalExpressionPartBracket.Init;
|
|
begin
|
|
inherited Init;
|
|
FIsClosed := False;
|
|
FIsClosing := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracket.HasPrecedence: Boolean;
|
|
begin
|
|
Result := False;
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartBracket.DoHandleEndOfExpression;
|
|
begin
|
|
if not IsClosed then begin
|
|
SetError('Bracket not closed');
|
|
exit;
|
|
end;
|
|
inherited DoHandleEndOfExpression;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracket.CanHaveOperatorAsNext: Boolean;
|
|
begin
|
|
Result := IsClosed;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracket.HandleNextPartInBracket(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
APart.Free;
|
|
SetError('Error in ()');
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartBracket.CloseBracket;
|
|
begin
|
|
FIsClosing := True;
|
|
if LastItem <> nil then
|
|
LastItem.HandleEndOfExpression;
|
|
FIsClosing := False;
|
|
FIsClosed := True;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBracket.HandleNextPart(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
if IsClosed then begin
|
|
Result := inherited HandleNextPart(APart);
|
|
exit;
|
|
end;
|
|
|
|
if not IsValidNextPart(APart) then begin
|
|
SetError(APart, 'Invalid operand in () '+GetText+': ');
|
|
Result := self;
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
|
|
Result := HandleNextPartInBracket(APart);
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartBracket.HandleEndOfExpression;
|
|
begin
|
|
if not FIsClosing then
|
|
inherited HandleEndOfExpression;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperator }
|
|
|
|
function TFpPascalExpressionPartOperator.DebugText(AIndent: String): String;
|
|
begin
|
|
Result := inherited DebugText(AIndent);
|
|
while Result[Length(Result)] in [#10, #13] do SetLength(Result, Length(Result)-1);
|
|
Result := Result + ' Precedence:' + dbgs(FPrecedence) +
|
|
LineEnding;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperator.CanHaveOperatorAsNext: Boolean;
|
|
begin
|
|
Result := HasAllOperands and LastItem.CanHaveOperatorAsNext;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperator.FindLeftSideOperandByPrecedence(AnOperator: TFpPascalExpressionPartWithPrecedence): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
|
|
if (not HasAllOperands) or (LastItem = nil) then begin
|
|
Result := nil;
|
|
exit
|
|
end;
|
|
|
|
// precedence: 1 = highest
|
|
if Precedence > AnOperator.Precedence then
|
|
Result := LastItem.FindLeftSideOperandByPrecedence(AnOperator);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperator.MaybeAddLeftOperand(APrevPart: TFpPascalExpressionPart;
|
|
var AResult: TFpPascalExpressionPart): Boolean;
|
|
var
|
|
ALeftSide: TFpPascalExpressionPart;
|
|
begin
|
|
Result := APrevPart.IsValidNextPart(Self);
|
|
if not Result then
|
|
exit;
|
|
|
|
AResult := Self;
|
|
if (Count > 0) or // Previous already set
|
|
(not APrevPart.CanHaveOperatorAsNext) // can not have 2 operators follow each other
|
|
then begin
|
|
SetError(APrevPart, 'Can not apply operator '+GetText+': ');
|
|
APrevPart.Free;
|
|
exit;
|
|
end;
|
|
|
|
ALeftSide := APrevPart.FindLeftSideOperandByPrecedence(Self);
|
|
if ALeftSide = nil then begin
|
|
SetError(Self, 'Internal parser error for operator '+GetText+': ');
|
|
APrevPart.Free;
|
|
exit;
|
|
end;
|
|
|
|
ALeftSide.ReplaceInParent(Self);
|
|
Add(ALeftSide);
|
|
end;
|
|
|
|
procedure TFpPascalExpressionPartOperator.DoHandleEndOfExpression;
|
|
begin
|
|
if not HasAllOperands then
|
|
SetError(Self, 'Not enough operands')
|
|
else
|
|
inherited DoHandleEndOfExpression;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperator.HandleNextPart(APart: TFpPascalExpressionPart): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
if HasAllOperands then begin
|
|
Result := inherited HandleNextPart(APart);
|
|
exit;
|
|
end;
|
|
if not IsValidNextPart(APart) then begin
|
|
SetError(APart, 'Not possible after Operator '+GetText+': ');
|
|
APart.Free;
|
|
exit;
|
|
end;
|
|
|
|
Add(APart);
|
|
Result := APart;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartUnaryOperator }
|
|
|
|
function TFpPascalExpressionPartUnaryOperator.HasAllOperands: Boolean;
|
|
begin
|
|
Result := Count = 1;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartBinaryOperator }
|
|
|
|
function TFpPascalExpressionPartBinaryOperator.HasAllOperands: Boolean;
|
|
begin
|
|
Result := Count = 2;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBinaryOperator.IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := inherited IsValidAfterPart(APrevPart);
|
|
if not Result then
|
|
exit;
|
|
|
|
Result := APrevPart.CanHaveOperatorAsNext;
|
|
|
|
// BinaryOperator...
|
|
// foo
|
|
// Identifer
|
|
// "Identifer" can hane a binary-op next. But it must be applied to the parent.
|
|
// So it is not valid here.
|
|
// If new operator has a higher precedence, it go down to the child again and replace it
|
|
if (APrevPart.Parent <> nil) and (APrevPart.Parent.HasPrecedence) then
|
|
Result := False;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartBinaryOperator.MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
|
|
var AResult: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := MaybeAddLeftOperand(APrevPart, AResult);
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorAddressOf }
|
|
|
|
procedure TFpPascalExpressionPartOperatorAddressOf.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_ADRESS_OF;
|
|
inherited Init;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorAddressOf.DoGetResultValue: TDbgSymbolValue;
|
|
var
|
|
tmp: TDbgSymbolValue;
|
|
begin
|
|
Result := nil;
|
|
if Count <> 1 then exit;
|
|
|
|
tmp := Items[0].ResultValue;
|
|
if (tmp = nil) or (tmp.Address = 0) then
|
|
exit;
|
|
|
|
Result := TPasParserAddressOfSymbolValue.Create(tmp);
|
|
{$IFDEF WITH_REFCOUNT_DEBUG}Result.DbgRenameReference(nil, 'DoGetResultValue');{$ENDIF}
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorMakeRef }
|
|
|
|
procedure TFpPascalExpressionPartOperatorMakeRef.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_MAKE_REF;
|
|
inherited Init;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorMakeRef.IsValidNextPart(APart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
if HasAllOperands then
|
|
Result := (inherited IsValidNextPart(APart))
|
|
else
|
|
Result := (inherited IsValidNextPart(APart)) and
|
|
( (APart is TFpPascalExpressionPartIdentifer) or
|
|
(APart is TFpPascalExpressionPartOperatorMakeRef)
|
|
);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorMakeRef.DoGetResultValue: TDbgSymbolValue;
|
|
var
|
|
tmp: TDbgSymbolValue;
|
|
begin
|
|
Result := nil;
|
|
if Count <> 1 then exit;
|
|
|
|
tmp := Items[0].ResultValue;
|
|
if (tmp = nil) or (tmp.DbgSymbol = nil) or (tmp.DbgSymbol.SymbolType <> stType) then
|
|
exit;
|
|
|
|
Result := TPasParserWrapperSymbolValue.Create(TPasParserSymbolPointer.Create(tmp.DbgSymbol));
|
|
{$IFDEF WITH_REFCOUNT_DEBUG}Result.DbgRenameReference(nil, 'DoGetResultValue');{$ENDIF}
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorMakeRef.DoGetIsTypeCast: Boolean;
|
|
begin
|
|
Result := True;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorDeRef }
|
|
|
|
procedure TFpPascalExpressionPartOperatorDeRef.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_DEREF;
|
|
inherited Init;
|
|
end;
|
|
|
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function TFpPascalExpressionPartOperatorDeRef.DoGetResultValue: TDbgSymbolValue;
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|
var
|
|
tmp: TDbgSymbolValue;
|
|
begin
|
|
Result := nil;
|
|
if Count <> 1 then exit;
|
|
|
|
tmp := Items[0].ResultValue;
|
|
if tmp = nil then
|
|
exit;
|
|
|
|
if tmp is TPasParserAddressOfSymbolValue then begin
|
|
Result := TPasParserAddressOfSymbolValue(tmp).PointedToValue;
|
|
Result.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultValue'){$ENDIF};
|
|
end
|
|
else
|
|
if tmp.Kind = skPointer then begin
|
|
// TODO
|
|
//Result := Result.TypeInfo;
|
|
end
|
|
//if tmp.Kind = skArray then // dynarray
|
|
else
|
|
Result := nil;
|
|
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorDeRef.MaybeHandlePrevPart(APrevPart: TFpPascalExpressionPart;
|
|
var AResult: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := MaybeAddLeftOperand(APrevPart, AResult);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorDeRef.FindLeftSideOperandByPrecedence(AnOperator: TFpPascalExpressionPartWithPrecedence): TFpPascalExpressionPart;
|
|
begin
|
|
Result := Self;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorDeRef.IsValidAfterPart(APrevPart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := inherited IsValidAfterPart(APrevPart);
|
|
if not Result then
|
|
exit;
|
|
|
|
Result := APrevPart.CanHaveOperatorAsNext;
|
|
|
|
// BinaryOperator...
|
|
// foo
|
|
// Identifer
|
|
// "Identifer" can hane a binary-op next. But it must be applied to the parent.
|
|
// So it is not valid here.
|
|
// If new operator has a higher precedence, it go down to the child again and replace it
|
|
if (APrevPart.Parent <> nil) and (APrevPart.Parent is TFpPascalExpressionPartOperator) then
|
|
Result := False;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorPlusMinus }
|
|
|
|
procedure TFpPascalExpressionPartOperatorPlusMinus.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_PLUS_MINUS;
|
|
inherited Init;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorMulDiv }
|
|
|
|
procedure TFpPascalExpressionPartOperatorMulDiv.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_MUL_DIV;
|
|
inherited Init;
|
|
end;
|
|
|
|
{ TFpPascalExpressionPartOperatorMemberOf }
|
|
|
|
procedure TFpPascalExpressionPartOperatorMemberOf.Init;
|
|
begin
|
|
FPrecedence := PRECEDENCE_MEMBER_OF;
|
|
inherited Init;
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorMemberOf.IsValidNextPart(APart: TFpPascalExpressionPart): Boolean;
|
|
begin
|
|
Result := inherited IsValidNextPart(APart);
|
|
if not HasAllOperands then
|
|
Result := Result and (APart is TFpPascalExpressionPartIdentifer);
|
|
end;
|
|
|
|
function TFpPascalExpressionPartOperatorMemberOf.DoGetResultValue: TDbgSymbolValue;
|
|
var
|
|
tmp: TDbgSymbolValue;
|
|
begin
|
|
Result := nil;
|
|
if Count <> 2 then exit;
|
|
|
|
tmp := Items[0].ResultValue;
|
|
if (tmp = nil) then exit;
|
|
// Todo unit
|
|
if (tmp.Kind = skClass) or (tmp.Kind = skRecord) then begin
|
|
Result := tmp.MemberByName[Items[1].GetText];
|
|
if Result <> nil then
|
|
Result.AddReference{$IFDEF WITH_REFCOUNT_DEBUG}(nil, 'DoGetResultValue'){$ENDIF};
|
|
Assert((Result=nil) or (Result.DbgSymbol=nil)or(Result.DbgSymbol.SymbolType=stValue), 'member is value');
|
|
end;
|
|
end;
|
|
|
|
end.
|
|
|