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281 lines
6.8 KiB
281 lines
6.8 KiB
//+-------------------------------------------------------------------------
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//
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// Copyright (C) 1991, Microsoft Corporation.
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//
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// File: State.hxx
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//
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// Contents: Finite automata state classes
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//
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// Classes:
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//
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// History: 01-21-92 KyleP Created
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// 03-11-97 arunk Modified for regex lib
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//--------------------------------------------------------------------------
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#ifndef __STATE_HXX__
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#define __STATE_HXX__
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#include <windows.h>
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#include <xlatchar.hxx>
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class CStateSet;
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class CSymbolSet;
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//
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// Special transition 'states'.
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//
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UINT const stateUncomputed = (1 << (sizeof( UINT ) * 8)) - 1; // Uncomputed move.
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UINT const stateUndefined = (1 << (sizeof( UINT ) * 8)) - 2; // Undefined move.
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UINT const stateUninitialized = (1 << (sizeof( UINT ) * 8)) - 3; // Uninitialized
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//+-------------------------------------------------------------------------
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//
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// Class: CFAState
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//
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// Purpose: Basic finite automata state.
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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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class CFAState
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{
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public:
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inline CFAState() {};
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inline CFAState( UINT iState, BOOL fFinal = false );
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inline void Init( UINT iState );
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inline UINT StateNumber() const;
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inline BOOL IsFinal() const;
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inline void MakeFinal();
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protected:
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UINT _iState;
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BOOL _fFinal;
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};
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//+-------------------------------------------------------------------------
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//
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// Class: CNFAState
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//
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// Purpose: Nondeterministic finite automata state.
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//
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// History: 20-Jan-92 KyleP Created
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//
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// Notes: The array of moves is split into two pieces. Since most
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// states only have a small number of transitions each
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// CNFAState will hold a small number in the CNFAState
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// object itself. Overflow is on the heap.
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//
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//--------------------------------------------------------------------------
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const int CNFAState_cFirst = 2; // Default number of moves per state
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class CNFAState : public CFAState
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{
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public:
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inline CNFAState();
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CNFAState( CNFAState const & src );
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CNFAState & operator=( CNFAState const & src );
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void Init( CNFAState & src );
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void Init( UINT iState ) { CFAState::Init( iState ); }
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inline ~CNFAState();
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void AddTransition( UINT symbol, UINT StateNum );
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void RemoveTransition( UINT symbol, UINT StateNum );
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void Move( CStateSet & ss, UINT symbol = symEpsilon );
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void Move( CStateSet & ss, CSymbolSet & symset );
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protected:
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class CMove
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{
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public:
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inline CMove();
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inline CMove( UINT symbol, UINT iState );
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UINT _symbol;
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UINT _iState;
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};
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CMove _moveFirst[CNFAState_cFirst];
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CMove * _pmoveRest;
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int _cmoveRest;
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int _cMove;
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};
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//+-------------------------------------------------------------------------
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//
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// Member: CFAState::CFAState, public
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//
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// Synopsis: Initialize new state.
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//
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// Arguments: [iState] -- State number.
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// [fFinal] -- true if state is a final state.
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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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inline CFAState::CFAState( UINT iState, BOOL fFinal )
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: _iState( iState ),
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_fFinal( fFinal )
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{
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CFAState::Init, public
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//
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// Synopsis: Initialize a new state.
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//
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// Arguments: [iState] -- State number.
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//
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// History: 10-Jul-92 KyleP Created
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// 23-Jul-92 KyleP Default states to non-final.
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//
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//--------------------------------------------------------------------------
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inline void CFAState::Init( UINT iState )
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{
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_iState = iState;
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_fFinal = false;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CFAState::StateNumber, public
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//
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// Returns: The state number.
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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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inline UINT CFAState::StateNumber() const
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{
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return( _iState );
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CFAState::IsFinal, public
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//
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// Returns: true if this state is a final state.
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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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inline BOOL CFAState::IsFinal() const
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{
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return( _fFinal );
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CFAState::MakeFinal, public
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//
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// Synopsis: Indicates state is a final state.
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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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inline void CFAState::MakeFinal()
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{
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_fFinal = true;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CNFAState::CMove::CMove, private
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//
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// Synopsis: Initializes move.
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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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inline CNFAState::CMove::CMove()
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{
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_symbol = symInvalid;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CNFAState::CMove::CMove, private
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//
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// Synopsis: Initializes move.
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//
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// Arguments: [symbol] -- On symbol, move to ...
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// [iState] -- this new state.
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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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inline CNFAState::CMove::CMove( UINT symbol, UINT iState )
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: _symbol( symbol ),
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_iState( iState )
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{
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CNFAState::CNFAState, public
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//
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// Synopsis: Initialize a state (no transitions)
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//
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// History: 20-Jan-92 KyleP Created
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//--------------------------------------------------------------------------
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inline CNFAState::CNFAState()
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: _cMove( 0 ),
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_pmoveRest( 0 ),
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_cmoveRest( 0 )
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{
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CNFAState::~CNFAState, public
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//
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// Effects: Clean up any spillover moves.
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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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inline CNFAState::~CNFAState()
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{
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delete _pmoveRest;
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}
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#endif // __STATE_HXX__
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