116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Copyright (C) 1996, Microsoft Corporation.
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//
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// File: express.hxx
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//
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// Contents: Used to parse and evaluate expressions
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//
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// History: 96/Jan/3 DwightKr Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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//+---------------------------------------------------------------------------
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//
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// Class: CHTXIfExpression
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//
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// Purpose: Parses an 'if' expression
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//
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// History: 96/Jan/23 DwightKr Created
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//
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//----------------------------------------------------------------------------
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class CHTXIfExpression
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{
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public:
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CHTXIfExpression( CTokenizeString & scanner,
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CVariableSet & variableSet,
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COutputFormat & outputFormat );
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BOOL Evaluate();
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private:
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CTokenizeString & _scanner;
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CVariableSet & _variableSet;
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COutputFormat & _outputFormat;
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CHTXIfExpressionValue
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//
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// Purpose: Parses the value portion of an 'if' expression
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//
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// History: 96/Jan/23 DwightKr Created
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//
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//----------------------------------------------------------------------------
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class CHTXIfExpressionValue : INHERIT_UNWIND
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{
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INLINE_UNWIND(CHTXIfExpressionValue);
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public:
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CHTXIfExpressionValue( CTokenizeString & scanner,
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CVariableSet & variableSet,
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COutputFormat & outputFormat );
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~CHTXIfExpressionValue();
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void ParseValue();
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VARTYPE GetType() const { return _propVariant.vt; }
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WCHAR * GetStringValue();
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PROPVARIANT * GetValue() { return &_propVariant; }
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BOOL IsConstant() const { return _fIsConstant; }
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BOOL GetVectorValueInteger( unsigned i, _int64 & value );
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BOOL GetVectorValueUnsignedInteger( unsigned i, unsigned __int64 & value );
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BOOL GetVectorValueDouble( unsigned i, double & dblValue );
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BOOL GetVectorValueStr( unsigned i, XCoMem<CHAR> & pszString);
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BOOL GetVectorValueBStr( unsigned i, BSTR & bwszString);
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BOOL GetVectorValueWStr( unsigned i, XCoMem<WCHAR> & wszString);
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private:
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PROPVARIANT _propVariant; // The value
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WCHAR * _wcsStringValue; // String value of expression
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CTokenizeString & _scanner; // Scans the buffer
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CVariableSet & _variableSet; // List of replaceable parameters
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COutputFormat & _outputFormat; // Format for numbers & dates
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GUID _guid; // Guid for this propVariant
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BOOL _fOwnVector; // vector in _propVariant owned?
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BOOL _fIsConstant; // Is this a constant or a variable?
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};
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//+---------------------------------------------------------------------------
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//
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// Class: CHTXIfExpressionOperator
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//
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// Purpose: Parses the operator portion of an 'if' expression
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//
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// History: 96/Jan/23 DwightKr Created
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//
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//----------------------------------------------------------------------------
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class CHTXIfExpressionOperator
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{
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public:
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CHTXIfExpressionOperator( CTokenizeString & scanner );
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void ParseOperator();
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BOOL Evaluate( CHTXIfExpressionValue & lhvalue,
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CHTXIfExpressionValue & rhvalue );
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BOOL Evaluate( CHTXIfExpressionValue & lhvalue );
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ULONG Operator() { return _operator; }
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private:
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ULONG _operator; // Current operator
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CTokenizeString & _scanner; // Scans the buffer
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};
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