Class TCustomExpressionParser

Description
Hierarchy
Fields
Methods
Properties

Unit

mdbf_prscore

Declaration

type TCustomExpressionParser = class(TObject)

Description

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Hierarchy

Overview

Fields

Protected FWordsList: TSortedCollection;

Methods

Protected function MakeRec: PExpressionRec; virtual;
Protected procedure FillExpressList; virtual; abstract;
Protected procedure HandleUnknownVariable(VarName: string); virtual; abstract;
Protected procedure CompileExpression(AnExpression: string);
Protected procedure EvaluateCurrent;
Protected procedure DisposeList(ARec: PExpressionRec);
Protected procedure DisposeTree(ExprRec: PExpressionRec);
Protected function CurrentExpression: string; virtual; abstract;
Protected function GetResultType: TExpressionType; virtual;
Public constructor Create;
Public destructor Destroy; override;
Public function DefineFloatVariable(AVarName: string; AValue: PDouble): TExprWord;
Public function DefineIntegerVariable(AVarName: string; AValue: PInteger): TExprWord;
Public function DefineDateTimeVariable(AVarName: string; AValue: PDateTimeRec): TExprWord;
Public function DefineBooleanVariable(AVarName: string; AValue: PBoolean): TExprWord;
Public function DefineStringVariable(AVarName: string; AValue: PPChar): TExprWord;
Public function DefineFunction(AFunctName, AShortName, ADescription, ATypeSpec: string; AMinFunctionArg: Integer; AResultType: TExpressionType; AFuncAddress: TExprFunc): TExprWord;
Public procedure Evaluate(AnExpression: string);
Public function AddExpression(AnExpression: string): Integer;
Public procedure ClearExpressions; virtual;
Public procedure GetFunctionNames(AList: TStrings);
Public function GetFunctionDescription(AFunction: string): string;

Properties

Protected property CurrentRec: PExpressionRec read FCurrentRec write FCurrentRec;
Protected property LastRec: PExpressionRec read FLastRec write FLastRec;
Protected property ExpResult: PChar read FExpResult;
Protected property ExpResultPos: PChar read FExpResultPos write FExpResultPos;
Public property HexChar: Char read FHexChar write FHexChar;
Public property ArgSeparator: Char read FArgSeparator write FArgSeparator;
Public property Optimize: Boolean read FOptimize write FOptimize;
Public property ResultType: TExpressionType read GetResultType;

Description

Fields

Protected FWordsList: TSortedCollection;

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Methods

Protected function MakeRec: PExpressionRec; virtual;

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Protected procedure FillExpressList; virtual; abstract;

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Protected procedure HandleUnknownVariable(VarName: string); virtual; abstract;

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Protected procedure CompileExpression(AnExpression: string);

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Protected procedure EvaluateCurrent;

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Protected procedure DisposeList(ARec: PExpressionRec);

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Protected procedure DisposeTree(ExprRec: PExpressionRec);

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Protected function CurrentExpression: string; virtual; abstract;

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Protected function GetResultType: TExpressionType; virtual;

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Public constructor Create;

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Public destructor Destroy; override;

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Public function DefineFloatVariable(AVarName: string; AValue: PDouble): TExprWord;

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Public function DefineIntegerVariable(AVarName: string; AValue: PInteger): TExprWord;

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Public function DefineDateTimeVariable(AVarName: string; AValue: PDateTimeRec): TExprWord;

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Public function DefineBooleanVariable(AVarName: string; AValue: PBoolean): TExprWord;

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Public function DefineStringVariable(AVarName: string; AValue: PPChar): TExprWord;

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Public function DefineFunction(AFunctName, AShortName, ADescription, ATypeSpec: string; AMinFunctionArg: Integer; AResultType: TExpressionType; AFuncAddress: TExprFunc): TExprWord;

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Public procedure Evaluate(AnExpression: string);

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Public function AddExpression(AnExpression: string): Integer;

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Public procedure ClearExpressions; virtual;

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Public procedure GetFunctionNames(AList: TStrings);

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Public function GetFunctionDescription(AFunction: string): string;

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Properties

Protected property CurrentRec: PExpressionRec read FCurrentRec write FCurrentRec;

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Protected property LastRec: PExpressionRec read FLastRec write FLastRec;

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Protected property ExpResult: PChar read FExpResult;

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Protected property ExpResultPos: PChar read FExpResultPos write FExpResultPos;

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Public property HexChar: Char read FHexChar write FHexChar;

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Public property ArgSeparator: Char read FArgSeparator write FArgSeparator;

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Public property Optimize: Boolean read FOptimize write FOptimize;

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Public property ResultType: TExpressionType read GetResultType;

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