697 lines
26 KiB
C++
697 lines
26 KiB
C++
/*
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***************************************************************************
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* Copyright (C) 1999-2006 International Business Machines Corporation *
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* and others. All rights reserved. *
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***************************************************************************
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**********************************************************************
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* Date Name Description
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* 10/22/99 alan Creation.
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* 11/11/99 rgillam Complete port from Java.
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**********************************************************************
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*/
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#ifndef RBBI_H
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#define RBBI_H
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C++ API: Rule Based Break Iterator
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*/
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#if !UCONFIG_NO_BREAK_ITERATION
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#include "unicode/brkiter.h"
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#include "unicode/udata.h"
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#include "unicode/parseerr.h"
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#include "unicode/schriter.h"
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#include "unicode/uchriter.h"
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struct UTrie;
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U_NAMESPACE_BEGIN
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/** @internal */
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struct RBBIDataHeader;
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class RuleBasedBreakIteratorTables;
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class BreakIterator;
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class RBBIDataWrapper;
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class UStack;
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class LanguageBreakEngine;
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class UnhandledEngine;
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struct RBBIStateTable;
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/**
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*
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* A subclass of BreakIterator whose behavior is specified using a list of rules.
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* <p>Instances of this class are most commonly created by the factory methods of
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* BreakIterator::createWordInstance(), BreakIterator::createLineInstance(), etc.,
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* and then used via the abstract API in class BreakIterator</p>
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*
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* <p>See the ICU User Guide for information on Break Iterator Rules.</p>
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*
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* <p>This class is not intended to be subclassed. (Class DictionaryBasedBreakIterator
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* is a subclass, but that relationship is effectively internal to the ICU
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* implementation. The subclassing interface to RulesBasedBreakIterator is
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* not part of the ICU API, and may not remain stable.</p>
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*
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*/
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class U_COMMON_API RuleBasedBreakIterator : public BreakIterator {
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protected:
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/**
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* The UText through which this BreakIterator accesses the text
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* @internal
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*/
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UText *fText;
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/**
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* A character iterator that refers to the same text as the UText, above.
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* Only included for compatibility with old API, which was based on CharacterIterators.
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* Value may be adopted from outside, or one of fSCharIter or fDCharIter, below.
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*/
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CharacterIterator *fCharIter;
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/**
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* When the input text is provided by a UnicodeString, this will point to
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* a characterIterator that wraps that data. Needed only for the
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* implementation of getText(), a backwards compatibility issue.
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*/
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StringCharacterIterator *fSCharIter;
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/**
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* When the input text is provided by a UText, this
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* dummy CharacterIterator over an empty string will
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* be returned from getText()
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*/
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UCharCharacterIterator *fDCharIter;
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/**
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* The rule data for this BreakIterator instance
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* @internal
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*/
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RBBIDataWrapper *fData;
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/** Index of the Rule {tag} values for the most recent match.
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* @internal
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*/
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int32_t fLastRuleStatusIndex;
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/**
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* Rule tag value valid flag.
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* Some iterator operations don't intrinsically set the correct tag value.
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* This flag lets us lazily compute the value if we are ever asked for it.
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* @internal
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*/
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UBool fLastStatusIndexValid;
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/**
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* Counter for the number of characters encountered with the "dictionary"
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* flag set.
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* @internal
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*/
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uint32_t fDictionaryCharCount;
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/**
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* When a range of characters is divided up using the dictionary, the break
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* positions that are discovered are stored here, preventing us from having
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* to use either the dictionary or the state table again until the iterator
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* leaves this range of text. Has the most impact for line breaking.
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* @internal
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*/
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int32_t* fCachedBreakPositions;
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/**
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* The number of elements in fCachedBreakPositions
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* @internal
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*/
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int32_t fNumCachedBreakPositions;
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/**
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* if fCachedBreakPositions is not null, this indicates which item in the
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* cache the current iteration position refers to
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* @internal
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*/
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int32_t fPositionInCache;
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/**
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*
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* If present, UStack of LanguageBreakEngine objects that might handle
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* dictionary characters. Searched from top to bottom to find an object to
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* handle a given character.
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* @internal
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*/
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UStack *fLanguageBreakEngines;
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/**
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*
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* If present, the special LanguageBreakEngine used for handling
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* characters that are in the dictionary set, but not handled by any
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* LangugageBreakEngine.
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* @internal
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*/
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UnhandledEngine *fUnhandledBreakEngine;
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/**
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*
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* The type of the break iterator, or -1 if it has not been set.
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* @internal
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*/
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int32_t fBreakType;
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protected:
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//=======================================================================
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// constructors
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//=======================================================================
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/**
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* Constructor from a flattened set of RBBI data in malloced memory.
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* RulesBasedBreakIterators built from a custom set of rules
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* are created via this constructor; the rules are compiled
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* into memory, then the break iterator is constructed here.
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*
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* The break iterator adopts the memory, and will
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* free it when done.
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* @internal
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*/
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RuleBasedBreakIterator(RBBIDataHeader* data, UErrorCode &status);
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friend class RBBIRuleBuilder;
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/** @internal */
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friend class BreakIterator;
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public:
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/** Default constructor. Creates an empty shell of an iterator, with no
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* rules or text to iterate over. Object can subsequently be assigned to.
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* @stable ICU 2.2
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*/
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RuleBasedBreakIterator();
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/**
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* Copy constructor. Will produce a break iterator with the same behavior,
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* and which iterates over the same text, as the one passed in.
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* @param that The RuleBasedBreakIterator passed to be copied
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* @stable ICU 2.0
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*/
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RuleBasedBreakIterator(const RuleBasedBreakIterator& that);
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/**
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* Construct a RuleBasedBreakIterator from a set of rules supplied as a string.
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* @param rules The break rules to be used.
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* @param parseError In the event of a syntax error in the rules, provides the location
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* within the rules of the problem.
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* @param status Information on any errors encountered.
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* @stable ICU 2.2
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*/
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RuleBasedBreakIterator( const UnicodeString &rules,
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UParseError &parseError,
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UErrorCode &status);
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/**
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* This constructor uses the udata interface to create a BreakIterator
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* whose internal tables live in a memory-mapped file. "image" is an
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* ICU UDataMemory handle for the pre-compiled break iterator tables.
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* @param image handle to the memory image for the break iterator data.
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* Ownership of the UDataMemory handle passes to the Break Iterator,
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* which will be responsible for closing it when it is no longer needed.
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* @param status Information on any errors encountered.
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* @see udata_open
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* @see #getBinaryRules
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* @stable ICU 2.8
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*/
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RuleBasedBreakIterator(UDataMemory* image, UErrorCode &status);
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/**
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* Destructor
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* @stable ICU 2.0
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*/
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virtual ~RuleBasedBreakIterator();
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/**
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* Assignment operator. Sets this iterator to have the same behavior,
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* and iterate over the same text, as the one passed in.
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* @param that The RuleBasedBreakItertor passed in
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* @return the newly created RuleBasedBreakIterator
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* @stable ICU 2.0
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*/
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RuleBasedBreakIterator& operator=(const RuleBasedBreakIterator& that);
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/**
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* Equality operator. Returns TRUE if both BreakIterators are of the
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* same class, have the same behavior, and iterate over the same text.
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* @param that The BreakIterator to be compared for equality
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* @return TRUE if both BreakIterators are of the
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* same class, have the same behavior, and iterate over the same text.
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* @stable ICU 2.0
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*/
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virtual UBool operator==(const BreakIterator& that) const;
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/**
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* Not-equal operator. If operator== returns TRUE, this returns FALSE,
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* and vice versa.
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* @param that The BreakIterator to be compared for inequality
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* @return TRUE if both BreakIterators are not same.
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* @stable ICU 2.0
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*/
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UBool operator!=(const BreakIterator& that) const;
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/**
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* Returns a newly-constructed RuleBasedBreakIterator with the same
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* behavior, and iterating over the same text, as this one.
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* Differs from the copy constructor in that it is polymorphic, and
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* will correctly clone (copy) a derived class.
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* clone() is thread safe. Multiple threads may simultaeneously
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* clone the same source break iterator.
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* @return a newly-constructed RuleBasedBreakIterator
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* @stable ICU 2.0
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*/
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virtual BreakIterator* clone() const;
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/**
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* Compute a hash code for this BreakIterator
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* @return A hash code
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* @stable ICU 2.0
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*/
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virtual int32_t hashCode(void) const;
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/**
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* Returns the description used to create this iterator
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* @return the description used to create this iterator
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* @stable ICU 2.0
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*/
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virtual const UnicodeString& getRules(void) const;
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//=======================================================================
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// BreakIterator overrides
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//=======================================================================
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/**
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* <p>
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* Return a CharacterIterator over the text being analyzed.
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* The returned character iterator is owned by the break iterator, and must
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* not be deleted by the caller. Repeated calls to this function may
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* return the same CharacterIterator.
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* </p>
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* <p>
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* The returned character iterator must not be used concurrently with
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* the break iterator. If concurrent operation is needed, clone the
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* returned character iterator first and operate on the clone.
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* </p>
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* <p>
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* When the break iterator is operating on text supplied via a UText,
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* this function will fail. Lacking any way to signal failures, it
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* returns an CharacterIterator containing no text.
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* The function getUText() provides similar functionality,
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* is reliable, and is more efficient.
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* </p>
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*
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* TODO: deprecate this function?
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*
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* @return An iterator over the text being analyzed.
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* @stable ICU 2.0
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*/
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virtual CharacterIterator& getText(void) const;
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/**
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* Get a UText for the text being analyzed.
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* The returned UText is a shallow clone of the UText used internally
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* by the break iterator implementation. It can safely be used to
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* access the text without impacting any break iterator operations,
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* but the underlying text itself must not be altered.
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*
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* @param fillIn A UText to be filled in. If NULL, a new UText will be
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* allocated to hold the result.
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* @param status receives any error codes.
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* @return The current UText for this break iterator. If an input
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* UText was provided, it will always be returned.
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* @draft ICU 3.4
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*/
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virtual UText *getUText(UText *fillIn, UErrorCode &status) const;
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/**
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* Set the iterator to analyze a new piece of text. This function resets
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* the current iteration position to the beginning of the text.
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* @param newText An iterator over the text to analyze. The BreakIterator
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* takes ownership of the character iterator. The caller MUST NOT delete it!
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* @stable ICU 2.0
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*/
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virtual void adoptText(CharacterIterator* newText);
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/**
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* Set the iterator to analyze a new piece of text. This function resets
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* the current iteration position to the beginning of the text.
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* @param newText The text to analyze.
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* @stable ICU 2.0
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*/
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virtual void setText(const UnicodeString& newText);
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/**
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* Reset the break iterator to operate over the text represented by
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* the UText. The iterator position is reset to the start.
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*
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* This function makes a shallow clone of the supplied UText. This means
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* that the caller is free to immediately close or otherwise reuse the
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* Utext that was passed as a parameter, but that the underlying text itself
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* must not be altered while being referenced by the break iterator.
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*
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* @param text The UText used to change the text.
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* @param status Receives any error codes.
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* @draft ICU 3.4
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*/
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virtual void setText(UText *text, UErrorCode &status);
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/**
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* Sets the current iteration position to the beginning of the text.
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* @return The offset of the beginning of the text.
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* @stable ICU 2.0
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*/
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virtual int32_t first(void);
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/**
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* Sets the current iteration position to the end of the text.
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* @return The text's past-the-end offset.
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* @stable ICU 2.0
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*/
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virtual int32_t last(void);
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/**
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* Advances the iterator either forward or backward the specified number of steps.
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* Negative values move backward, and positive values move forward. This is
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* equivalent to repeatedly calling next() or previous().
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* @param n The number of steps to move. The sign indicates the direction
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* (negative is backwards, and positive is forwards).
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* @return The character offset of the boundary position n boundaries away from
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* the current one.
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* @stable ICU 2.0
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*/
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virtual int32_t next(int32_t n);
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/**
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* Advances the iterator to the next boundary position.
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* @return The position of the first boundary after this one.
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* @stable ICU 2.0
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*/
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virtual int32_t next(void);
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/**
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* Moves the iterator backwards, to the last boundary preceding this one.
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* @return The position of the last boundary position preceding this one.
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* @stable ICU 2.0
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*/
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virtual int32_t previous(void);
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/**
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* Sets the iterator to refer to the first boundary position following
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* the specified position.
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* @param offset The position from which to begin searching for a break position.
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* @return The position of the first break after the current position.
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* @stable ICU 2.0
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*/
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virtual int32_t following(int32_t offset);
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/**
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* Sets the iterator to refer to the last boundary position before the
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* specified position.
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* @param offset The position to begin searching for a break from.
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* @return The position of the last boundary before the starting position.
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* @stable ICU 2.0
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*/
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virtual int32_t preceding(int32_t offset);
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/**
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* Returns true if the specfied position is a boundary position. As a side
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* effect, leaves the iterator pointing to the first boundary position at
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* or after "offset".
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* @param offset the offset to check.
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* @return True if "offset" is a boundary position.
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* @stable ICU 2.0
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*/
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virtual UBool isBoundary(int32_t offset);
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/**
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* Returns the current iteration position.
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* @return The current iteration position.
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* @stable ICU 2.0
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*/
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virtual int32_t current(void) const;
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/**
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* Return the status tag from the break rule that determined the most recently
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* returned break position. For break rules that do not specify a
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* status, a default value of 0 is returned. If more than one break rule
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* would cause a boundary to be located at some position in the text,
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* the numerically largest of the applicable status values is returned.
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* <p>
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* Of the standard types of ICU break iterators, only word break and
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* line break provide status values. The values are defined in
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* the header file ubrk.h. For Word breaks, the status allows distinguishing between words
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* that contain alphabetic letters, "words" that appear to be numbers,
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* punctuation and spaces, words containing ideographic characters, and
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* more. For Line Break, the status distinguishes between hard (mandatory) breaks
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* and soft (potential) break positions.
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* <p>
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* <code>getRuleStatus()</code> can be called after obtaining a boundary
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* position from <code>next()</code>, <code>previous()</code>, or
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* any other break iterator functions that returns a boundary position.
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* <p>
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* When creating custom break rules, one is free to define whatever
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* status values may be convenient for the application.
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* <p>
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* Note: this function is not thread safe. It should not have been
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* declared const, and the const remains only for compatibility
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* reasons. (The function is logically const, but not bit-wise const).
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* <p>
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* @return the status from the break rule that determined the most recently
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* returned break position.
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*
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* @see UWordBreak
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* @stable ICU 2.2
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*/
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virtual int32_t getRuleStatus() const;
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/**
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* Get the status (tag) values from the break rule(s) that determined the most
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* recently returned break position.
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* <p>
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* The returned status value(s) are stored into an array provided by the caller.
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* The values are stored in sorted (ascending) order.
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* If the capacity of the output array is insufficient to hold the data,
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* the output will be truncated to the available length, and a
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* U_BUFFER_OVERFLOW_ERROR will be signaled.
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*
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* @param fillInVec an array to be filled in with the status values.
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* @param capacity the length of the supplied vector. A length of zero causes
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* the function to return the number of status values, in the
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* normal way, without attemtping to store any values.
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* @param status receives error codes.
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* @return The number of rule status values from rules that determined
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* the most recent boundary returned by the break iterator.
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* In the event of a U_BUFFER_OVERFLOW_ERROR, the return value
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* is the total number of status values that were available,
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* not the reduced number that were actually returned.
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* @see getRuleStatus
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* @stable ICU 3.0
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*/
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virtual int32_t getRuleStatusVec(int32_t *fillInVec, int32_t capacity, UErrorCode &status);
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/**
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* Returns a unique class ID POLYMORPHICALLY. Pure virtual override.
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* This method is to implement a simple version of RTTI, since not all
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* C++ compilers support genuine RTTI. Polymorphic operator==() and
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* clone() methods call this method.
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*
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* @return The class ID for this object. All objects of a
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* given class have the same class ID. Objects of
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* other classes have different class IDs.
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* @stable ICU 2.0
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*/
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virtual UClassID getDynamicClassID(void) const;
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/**
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* Returns the class ID for this class. This is useful only for
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* comparing to a return value from getDynamicClassID(). For example:
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*
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* Base* polymorphic_pointer = createPolymorphicObject();
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* if (polymorphic_pointer->getDynamicClassID() ==
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* Derived::getStaticClassID()) ...
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*
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* @return The class ID for all objects of this class.
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* @stable ICU 2.0
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*/
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static UClassID U_EXPORT2 getStaticClassID(void);
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/*
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* Create a clone (copy) of this break iterator in memory provided
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* by the caller. The idea is to increase performance by avoiding
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* a storage allocation. Use of this functoin is NOT RECOMMENDED.
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* Performance gains are minimal, and correct buffer management is
|
|
* tricky. Use clone() instead.
|
|
*
|
|
* @param stackBuffer The pointer to the memory into which the cloned object
|
|
* should be placed. If NULL, allocate heap memory
|
|
* for the cloned object.
|
|
* @param BufferSize The size of the buffer. If zero, return the required
|
|
* buffer size, but do not clone the object. If the
|
|
* size was too small (but not zero), allocate heap
|
|
* storage for the cloned object.
|
|
*
|
|
* @param status Error status. U_SAFECLONE_ALLOCATED_WARNING will be
|
|
* returned if the the provided buffer was too small, and
|
|
* the clone was therefore put on the heap.
|
|
*
|
|
* @return Pointer to the clone object. This may differ from the stackBuffer
|
|
* address if the byte alignment of the stack buffer was not suitable
|
|
* or if the stackBuffer was too small to hold the clone.
|
|
* @stable ICU 2.0
|
|
*/
|
|
virtual BreakIterator * createBufferClone(void *stackBuffer,
|
|
int32_t &BufferSize,
|
|
UErrorCode &status);
|
|
|
|
|
|
/**
|
|
* Return the binary form of compiled break rules,
|
|
* which can then be used to create a new break iterator at some
|
|
* time in the future. Creating a break iterator from pre-compiled rules
|
|
* is much faster than building one from the source form of the
|
|
* break rules.
|
|
*
|
|
* The binary data can only be used with the same version of ICU
|
|
* and on the same platform type (processor endian-ness)
|
|
*
|
|
* @param length Returns the length of the binary data. (Out paramter.)
|
|
*
|
|
* @return A pointer to the binary (compiled) rule data. The storage
|
|
* belongs to the RulesBasedBreakIterator object, not the
|
|
* caller, and must not be modified or deleted.
|
|
* @internal
|
|
*/
|
|
virtual const uint8_t *getBinaryRules(uint32_t &length);
|
|
|
|
|
|
protected:
|
|
//=======================================================================
|
|
// implementation
|
|
//=======================================================================
|
|
/**
|
|
* Dumps caches and performs other actions associated with a complete change
|
|
* in text or iteration position.
|
|
* @internal
|
|
*/
|
|
virtual void reset(void);
|
|
|
|
#if 0
|
|
/**
|
|
* Return true if the category lookup for this char
|
|
* indicates that it is in the set of dictionary lookup chars.
|
|
* This function is intended for use by dictionary based break iterators.
|
|
* @return true if the category lookup for this char
|
|
* indicates that it is in the set of dictionary lookup chars.
|
|
* @internal
|
|
*/
|
|
virtual UBool isDictionaryChar(UChar32);
|
|
|
|
/**
|
|
* Get the type of the break iterator.
|
|
* @internal
|
|
*/
|
|
virtual int32_t getBreakType() const;
|
|
#endif
|
|
|
|
/**
|
|
* Set the type of the break iterator.
|
|
* @internal
|
|
*/
|
|
virtual void setBreakType(int32_t type);
|
|
|
|
/**
|
|
* Common initialization function, used by constructors and bufferClone.
|
|
* (Also used by DictionaryBasedBreakIterator::createBufferClone().)
|
|
* @internal
|
|
*/
|
|
void init();
|
|
|
|
private:
|
|
|
|
/**
|
|
* This method backs the iterator back up to a "safe position" in the text.
|
|
* This is a position that we know, without any context, must be a break position.
|
|
* The various calling methods then iterate forward from this safe position to
|
|
* the appropriate position to return. (For more information, see the description
|
|
* of buildBackwardsStateTable() in RuleBasedBreakIterator.Builder.)
|
|
* @param statetable state table used of moving backwards
|
|
* @internal
|
|
*/
|
|
int32_t handlePrevious(const RBBIStateTable *statetable);
|
|
|
|
/**
|
|
* This method is the actual implementation of the next() method. All iteration
|
|
* vectors through here. This method initializes the state machine to state 1
|
|
* and advances through the text character by character until we reach the end
|
|
* of the text or the state machine transitions to state 0. We update our return
|
|
* value every time the state machine passes through a possible end state.
|
|
* @param statetable state table used of moving forwards
|
|
* @internal
|
|
*/
|
|
int32_t handleNext(const RBBIStateTable *statetable);
|
|
|
|
/**
|
|
* This is the function that actually implements dictionary-based
|
|
* breaking. Covering at least the range from startPos to endPos,
|
|
* it checks for dictionary characters, and if it finds them determines
|
|
* the appropriate object to deal with them. It may cache found breaks in
|
|
* fCachedBreakPositions as it goes. It may well also look at text outside
|
|
* the range startPos to endPos.
|
|
* If going forward, endPos is the normal Unicode break result, and
|
|
* if goind in reverse, startPos is the normal Unicode break result
|
|
* @param startPos The start position of a range of text
|
|
* @param endPos The end position of a range of text
|
|
* @param reverse The call is for the reverse direction
|
|
* @internal
|
|
*/
|
|
int32_t checkDictionary(int32_t startPos, int32_t endPos, UBool reverse);
|
|
|
|
/**
|
|
* This function returns the appropriate LanguageBreakEngine for a
|
|
* given character c.
|
|
* @param c A character in the dictionary set
|
|
* @internal
|
|
*/
|
|
const LanguageBreakEngine *getLanguageBreakEngine(UChar32 c);
|
|
|
|
/**
|
|
* @internal
|
|
*/
|
|
void makeRuleStatusValid();
|
|
|
|
};
|
|
|
|
//------------------------------------------------------------------------------
|
|
//
|
|
// Inline Functions Definitions ...
|
|
//
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline UBool RuleBasedBreakIterator::operator!=(const BreakIterator& that) const {
|
|
return !operator==(that);
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_BREAK_ITERATION */
|
|
|
|
#endif
|