148 lines
3.3 KiB
C++
148 lines
3.3 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Copyright (C) 1991, Microsoft Corporation.
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//
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// File: StateSet.cxx
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//
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// Contents:
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//
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// Classes:
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//
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// History: 01-20-92 KyleP Created
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// 03-11-97 arunk Modified for regex lib
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//--------------------------------------------------------------------------
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// Local includes:
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#include <stateset.hxx>
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//+-------------------------------------------------------------------------
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//
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// Member: CStateSet::Clear, public
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//
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// Synopsis: Re-initializes a state set to empty.
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//
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// History: 20-Jan-92 KyleP Created
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//
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//--------------------------------------------------------------------------
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void CStateSet::Clear()
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{
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delete _puiRest;
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_cStates = 0;
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_cRest = 0;
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_puiRest = 0;
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_cuiRest = 0;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CStateSet::Add, public
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//
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// Synopsis: Adds a state to the state set.
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//
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// Arguments: [state] -- State to add.
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//
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// History: 20-Jan-92 KyleP Created
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//
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//--------------------------------------------------------------------------
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void CStateSet::Add( UINT state )
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{
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if ( IsMember( state ) )
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return;
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if ( _cStates < CStateSet_cFirst )
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{
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_auiFirst[ _cStates ] = state;
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}
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else
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{
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if ( _cRest >= _cuiRest )
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{
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UINT * oldpuiRest = _puiRest;
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UINT oldcuiRest = _cuiRest;
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_cuiRest += 10;
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_puiRest = new UINT [ _cuiRest ];
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memcpy( _puiRest, oldpuiRest, oldcuiRest * sizeof( UINT ) );
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delete oldpuiRest;
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}
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_puiRest[ _cRest ] = state;
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++_cRest;
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}
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++_cStates;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CStateSet::State, public
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//
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// Arguments: [iState] -- Index of state to return.
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//
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// Returns: The [iState] state in the state set.
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//
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// History: 20-Jan-92 KyleP Created
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//
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//--------------------------------------------------------------------------
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UINT CStateSet::State( UINT iState ) const
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{
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if ( iState <= CStateSet_cFirst )
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{
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return( _auiFirst[ iState - 1 ] );
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}
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else
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{
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return( _puiRest[ iState - CStateSet_cFirst - 1 ] );
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}
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CStateSet::IsMember, public
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//
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// Arguments: [state] -- State to look for.
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//
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// Returns: true if [state] is in set.
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//
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// History: 20-Jan-92 KyleP Created
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//
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//--------------------------------------------------------------------------
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BOOL CStateSet::IsMember( UINT state )
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{
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if ( _cStates == 0 )
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return( false );
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//
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// Naive implementation. As long as state sets are small this
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// will work fine.
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//
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for ( int i = min( _cStates, CStateSet_cFirst) - 1;
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i >= 0;
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i-- )
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{
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if( _auiFirst[ i ] == state )
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return( true );
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}
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if ( _cStates > CStateSet_cFirst )
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{
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for ( int i = _cStates - CStateSet_cFirst - 1;
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i >= 0;
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i-- )
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{
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if( _puiRest[ i ] == state )
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return( true );
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}
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}
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return( false );
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}
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