151 lines
3.8 KiB
C++
151 lines
3.8 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation, 1991 - 2000.
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//
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// File: Xpr.cxx
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//
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// Contents: Internal expression classes
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//
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// Classes: CXpr
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//
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// History: 11-Sep-91 KyleP Created
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//
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//----------------------------------------------------------------------------
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#include <pch.cxx>
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#pragma hdrstop
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#include <xpr.hxx>
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::IsMatch, public
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//
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// Arguments: [obj] -- Objects table
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//
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// Returns: FALSE (default)
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//
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// History: 01-Dec-91 KyleP Created.
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//
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//----------------------------------------------------------------------------
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BOOL CXpr::IsMatch( CRetriever & )
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{
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return( FALSE );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::HitCount, public
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//
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// Returns: 0 (default)
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//
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// History: 01-May-91 KyleP Created.
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//
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//----------------------------------------------------------------------------
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ULONG CXpr::HitCount( CRetriever & )
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{
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return( 0 );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::Rank, public
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//
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// Returns: MaxRank (default)
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//
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// History: 01-May-91 KyleP Created.
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//
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//----------------------------------------------------------------------------
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LONG CXpr::Rank( CRetriever & )
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{
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return( MAX_QUERY_RANK );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::ValueType, public
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//
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// Returns: Default value type (PTNone).
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//
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// History: 26-Nov-91 KyleP Created.
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//
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//----------------------------------------------------------------------------
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ULONG CXpr::ValueType() const
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{
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return( VT_EMPTY );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::Clone(), public
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//
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// Returns: A new copy of the expression.
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//
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// Signals: ???
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//
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// History: 11-Dec-91 KyleP Created.
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//
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// Notes: This must be subclassed by every node type which will
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// actually be cloned.
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//
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//----------------------------------------------------------------------------
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CXpr * CXpr::Clone()
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{
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//
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// It is illegal to clone an expression which hasn't over-ridden this.
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//
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Win4Assert( 0 );
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return( 0 );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::IsLeaf, public
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//
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// Synopsis: Determines if an expression is a leaf node.
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//
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// Returns: TRUE for this default implementation.
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//
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// History: 11-Dec-91 KyleP Created.
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//
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//----------------------------------------------------------------------------
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BOOL CXpr::IsLeaf() const
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{
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return( TRUE );
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CXpr::GetValue, public
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//
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// Synopsis: Calculates the value of the expression for the current object.
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//
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// Arguments: [obj] -- Objects table. Positioned to current object.
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// [p] -- Buffer to store value.
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// [pcb] -- On input, size of p, on output, return size if
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// successful, else required size.
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//
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// Returns: GVRNotSupported for this default implementation.
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//
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// History: 11-Dec-91 KyleP Created.
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//
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// Notes: This is a virtual method of CXpr to make it a simple
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// transformation to allow *any* expression to return a
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// value instead of just property value expressions.
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//
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//----------------------------------------------------------------------------
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GetValueResult CXpr::GetValue(CRetriever &, PROPVARIANT *, ULONG *)
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{
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return( GVRNotSupported );
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}
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