136 lines
3.5 KiB
C++
136 lines
3.5 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Copyright (C) 1991, Microsoft Corporation.
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//
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// File: XlatChar.hxx
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//
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// Contents: Character translation class.
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//
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// Classes: CXlatChar
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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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//--------------------------------------------------------------------------
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#ifndef __XLATCHAR_HXX__
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#define __XLATCHAR_HXX__
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#include <windows.h>
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//
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// Special character equivalence classes. I suppose in theory these
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// could doubly map to character classes in the regex but nearly
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// every unicode symbol must be treated uniquely somewhere in the
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// regex for that to happen.
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//
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UINT const symAny = 1; // Any single character (except BEG/END LINE)
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UINT const symBeginLine = 2; // Special character indicating beginning
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// of line.
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UINT const symEndLine = 3; // Special character indicating end of line.
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UINT const symInvalid = 4; // Guaranteed invalid
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UINT const symEpsilon = 5; // Epsilon move.
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UINT const symDot = 6; // '.' Don't ask. It's for DOS compliance
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UINT const cSpecialCharClasses = symDot; // 'normal' character classes
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// start here.
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//
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// Wide character values less than or equal to symLastValidCharacter have
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// no special signifigance.
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//
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UINT const symLastValidChar = 0xffffffff;
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//+-------------------------------------------------------------------------
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//
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// Class: CXlatChar
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//
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// Purpose: Maps UniCode characters to equivalence class(es).
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//
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// History: 20-Jan-92 KyleP Created
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//
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// Notes: Equivalence classes must consist of sequential characters.
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// The implementation for this class is a sorted array of
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// characters. Each character marks the end of a range. The
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// class for a given character is found by binary searching
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// the array until you end up in the appropriate range.
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//
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//--------------------------------------------------------------------------
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class CXlatChar
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{
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public:
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CXlatChar( bool fCaseSens );
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CXlatChar( CXlatChar const & src );
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inline ~CXlatChar();
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void AddRange( WCHAR wcStart, WCHAR wcEnd );
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UINT Translate( WCHAR wc );
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UINT TranslateRange( WCHAR wcStart, WCHAR wcEnd );
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inline UINT NumClasses() const;
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void Prepare();
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private:
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UINT _Search( WCHAR wc );
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void _Realloc();
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WCHAR * _pwcRangeEnd; // Character in position i is the end
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// of the ith range.
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UINT _cRange;
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UINT _cAllocation;
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UINT _iPrevRange;
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bool _fCaseSens; // true if case sensitive mapping.
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};
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//+-------------------------------------------------------------------------
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//
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// Member: CXlatChar::NumClasses, public
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//
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// Returns: The number of different equivalence classes.
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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 CXlatChar::NumClasses() const
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{
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return( _cRange + cSpecialCharClasses );
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CXlatChar::~CXlatChar, public
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//
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// Synopsis: Destroys class.
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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 CXlatChar::~CXlatChar()
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{
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delete _pwcRangeEnd;
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}
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#endif //__XLATCHAR_HXX__
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