245 lines
8.8 KiB
C
245 lines
8.8 KiB
C
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/*
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* @doc INTERNAL
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*
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* @module _TEXT.H -- Declaration for a CTxtRun pointer |
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*
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* CTxtRun pointers point at the plain text runs (CTxtArray) of the
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* backing store and derive from CRunPtrBase via the CRunPtr template.
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*
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* Copyright (c) 1995-1998, Microsoft Corporation. All rights reserved.
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*/
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#ifndef _TEXT_H
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#define _TEXT_H
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#include "_runptr.h"
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#include "_doc.h"
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#include "textserv.h"
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#include "_m_undo.h"
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class CRchTxtPtr;
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class CTxtEdit;
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class CTxtIStream;
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/*
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* CTxtPtr
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*
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* @class
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* provides access to the array of characters in the backing store
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* (i.e. <c CTxtArray>)
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*
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* @base public | CRunPtr<lt>CTxtArray<gt>
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*
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* @devnote
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* The state transitions for this object are the same as those for
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* <c CRunPtrBase>. <md CTxtPtr::_cp> simply caches the current
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* cp (even though it can be derived from _iRun and _ich). _cp is
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* used frequently enough (and computing may be expensive) that
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* caching the value is worthwhile.
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*
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* CTxtPtr's *may* be put on the stack, but do so with extreme
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* caution. These objects do *not* float; if a change is made to
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* the backing store while a CTxtPtr is active, it will be out
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* of sync and may lead to a crash. If such a situation may
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* exist, use a <c CTxtRange> instead (as these float and keep
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* their internal text && format run pointers up-to-date).
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*
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* Otherwise, a CTxtPtr is a useful, very lightweight plain
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* text scanner.
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*/
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// FindEOP() result flags. Low byte used for cchEOP
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#define FEOP_CELL 256
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#define FEOP_EOP 512
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// FindWhiteSpace input flags
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#define FWS_SKIP 1
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#define FWS_BOUNDTOPARA 2
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#define FWS_ADVANCECP 256
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class CTxtPtr : public CRunPtr<CTxtBlk>
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{
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// Only CRchTxtPtr is allowed to call private methods like replace range.
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friend class CRchTxtPtr;
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//@access Public Methods
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public:
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#ifdef DEBUG
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BOOL Invariant( void ) const; //@cmember Invariant checking
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void MoveGapToEndOfBlock () const;
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#endif // DEBUG
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CTxtPtr(CTxtEdit *ped, LONG cp); //@cmember Constructor
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CTxtPtr(const CTxtPtr &tp); //@cmember Copy Constructor
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LONG GetText(LONG cch, TCHAR *pch); //@cmember Fetch <p cch> chars
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//@cmember Fetch <p cch> chars with usp xlat
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LONG GetTextForUsp(LONG cch, TCHAR *pch, BOOL fNeutralOverride);
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//@cmember Fetch <p cch> chars with xlat
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LONG GetPlainText(LONG cch, TCHAR *pchBuff,
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LONG cpMost, BOOL fTextize, BOOL fAdjustCRLF = TRUE);
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TCHAR NextCharCount(LONG& cch); //@cmember Advance, GetChar, decrement
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TCHAR NextChar(); //@cmember Advance to & return next char
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TCHAR PrevChar(); //@cmember Backup to & return previous char
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TCHAR GetChar(); //@cmember Fetch char at current cp
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TCHAR GetPrevChar(); //@cmember Fetch char at previous cp
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LONG GetTextLength() const; //@cmember Get total cch for this document
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const TCHAR* GetPch(LONG& cchValid) const;//@cmember Get ptr to block of chars
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//@cmember Get ptr to a reverse block of chars
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const TCHAR* GetPchReverse(LONG& cchValidReverse, LONG* pcchValid = NULL);
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// The text array has its own versions of these methods (overuling
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// those in runptr base so that <md CTxtPtr::_cp> can be correctly
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// maintained.
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LONG BindToCp(LONG cp); //@cmember Rebinds text pointer to cp
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LONG SetCp(LONG cp); //@cmember Sets the cp for the run ptr
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LONG GetCp() const //@cmember Gets the current cp
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{
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// NB! Don't do invariant checking here so floating
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// range mechanism can work OK
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return _cp;
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};
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void Zombie(); //@cmember Turn this tp into a zombie
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LONG AdvanceCp(LONG cch);//@cmember Advance cp by cch chars
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// Advance/backup/adjust safe over CRLF and UTF-16 word pairs
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LONG AdjustCpCRLF(); //@cmember Backup to start of multichar
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LONG AdvanceCpCRLF(BOOL fMulticharAdvance = TRUE); //@cmember Advance over multichar
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//@cmember Backup over multichar
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LONG BackupCpCRLF(BOOL fMulticharBackup = TRUE);
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BOOL IsAfterEOP(); //@cmember Does current cp follow an EOP?
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BOOL IsAtEOP(); //@cmember Is current cp at an EOP marker?
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BOOL IsAtBOSentence(); //@cmember At beginning of a sentence?
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BOOL IsAtBOWord(); //@cmember At beginning of word?
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LONG MoveWhile(LONG cchRun, WCHAR chFirst, WCHAR chLast, BOOL fInRange);
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// Search
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//@cmember Find indicated text
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LONG FindText(LONG cpMost, DWORD dwFlags, TCHAR const *pch, LONG cch);
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//@cmember Find next EOP
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LONG FindEOP(LONG cchMax, LONG *pResults = NULL);
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//@cmember Find next exact match to <p pch>
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LONG FindExact(LONG cchMax, TCHAR *pch);
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LONG FindBOSentence(LONG cch); //@cmember Find beginning of sentence
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LONG FindOrSkipWhiteSpaces(LONG cchMax, DWORD dwFlags = 0, DWORD* pdwResult = NULL);
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LONG FindWhiteSpaceBound(LONG cchMin, LONG& cpStart, LONG& cpEnd, DWORD dwFlags = 0);
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// Word break support
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LONG FindWordBreak(INT action, LONG cpMost = -1);//@cmember Find next word break
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LONG TranslateRange(LONG cch, UINT CodePage,
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BOOL fSymbolCharSet, IUndoBuilder *publdr);
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//@access Private methods and data
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private:
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//@cmember Replace <p cchOld> characters with
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// <p cchNew> characters from <p pch>
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LONG ReplaceRange(LONG cchOld, LONG cchNew, TCHAR const *pch,
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IUndoBuilder *publdr, IAntiEvent *paeCF,
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IAntiEvent *paePF);
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//@cmember undo helper
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void HandleReplaceRangeUndo(LONG cchOld, LONG cchNew,
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IUndoBuilder *publdr, IAntiEvent *paeCF,
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IAntiEvent *paePF);
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//@cmember Insert a range of text helper
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// for ReplaceRange
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LONG InsertRange(LONG cch, TCHAR const *pch);
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void DeleteRange(LONG cch); //@cmember Delete range of text helper
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// for ReplaceRange
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// support class for FindText
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class CTxtFinder
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{
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public:
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BOOL FindText(const CTxtPtr &tp, LONG cpMost, DWORD dwFlags,
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const TCHAR *pchToFind, LONG cchToFind,
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LONG &cpFirst, LONG &cpLast);
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//@cmember Same functionality as CTxtPtr::FindText wrapper
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private:
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inline BOOL CharComp(TCHAR ch1, TCHAR ch2) const;
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inline BOOL CharCompIgnoreCase(TCHAR ch1, TCHAR ch2) const;
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LONG FindChar(TCHAR ch, CTxtIStream &tistr);
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//@cmember Advances cp to char matching ch from CTxtIStream
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LONG MatchString(const TCHAR *pchToFind, LONG cchToFind, CTxtIStream &tistr);
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//@cmember Advances cp if chars in pchToFind match next chars from CTxtIStream
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LONG MatchStringBiDi(const TCHAR *pchToFind, LONG cchToFind, CTxtIStream &tistr);
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//@cmember Like MatchString, but with checks for special Arabic/Hebrew chars
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LONG _cchToSearch; //@cmember # of chars to search for current FindText call
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BOOL _fSearchForward;
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BOOL _fIgnoreCase;
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BOOL _fMatchAlefhamza; //@cmember Flags derived from dwFlags from FindText for
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BOOL _fMatchKashida; // Arabic/Hebrew searches
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BOOL _fMatchDiac;
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int _iDirection; //@cmember +/-1 to step through pchToFind
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};
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LONG _cp; //@cmember Character position in text stream
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#ifdef DEBUG
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const WCHAR *_pchCp; // Points to string at cp for ease in debugging
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#endif
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public:
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CTxtEdit * _ped; //@cmember Ptr to text edit class needed for
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// things like word break proc and used a lot
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// by derived classes
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};
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/*
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* CTxtIStream
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*
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* @class
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* Refinement of the CTxtPtr class which implements an istream-like interface.
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* Given a CTxtPtr and a direction, a CTxtFinder object returns a char
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* for every call to GetChar. No putzing around with the buffer gap is
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* necessary, and expensive calls to AdvanceCp and GetPch are kept to an
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* absolute minimum.
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*
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* @base private | CTxtPtr
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*
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* @devnote
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* At present, this class is used in the implementation of the CTxtFinder
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* class. Finds require fast scanning of the sequence of characters leading
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* in either direction from the cp. Calls to AdvanceCp and GetPch slow down
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* such scanning significantly, so this class implements a unidirectional
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* istream-like scanner which avoids unnecessary calls to these expensive
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* CTxtPtr methods.
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*/
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class CTxtIStream : private CTxtPtr
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{
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public:
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enum { DIR_FWD, DIR_REV };
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typedef TCHAR (CTxtIStream::*PFNGETCHAR)();
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//@cmember Creates istr to read in iDir
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CTxtIStream(const CTxtPtr &tp, int iDir);
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inline TCHAR GetChar() //@cmember Returns next char in stream dir
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{ return (this->*_pfnGetChar)(); }
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private:
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TCHAR GetNextChar(); //@cmember Returns next char in fwd dir
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TCHAR GetPrevChar(); //@cmember Returns next char in rev dir
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void FillPchFwd(); //@cmember Refreshes _pch and _cch with chars in fwd dir
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void FillPchRev(); //@cmember Refreshes _pch and _cch with chars in rev dir
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PFNGETCHAR _pfnGetChar; //@cmember Func ptr to routine which get next char in iDir
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LONG _cch; //@cmember Count of valid chars in _pch in iDir
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const TCHAR *_pch; //@cmember Next _cch chars in iDir
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};
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// ======================= Misc. routines ====================================================
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void TxCopyText(TCHAR const *pchSrc, TCHAR *pchDst, LONG cch);
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//LONG TxFindEOP(const TCHAR *pchBuff, LONG cch);
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INT CALLBACK TxWordBreakProc(TCHAR const *pch, INT ich, INT cb, INT action);
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#endif
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