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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/**
************************************************************************************
* Copyright (C) 2006-2012, International Business Machines Corporation and others. *
* All Rights Reserved. *
************************************************************************************
*/
#ifndef BRKENG_H
#define BRKENG_H
#include "unicode/utypes.h"
#include "unicode/uobject.h"
#include "unicode/utext.h"
#include "unicode/uscript.h"
U_NAMESPACE_BEGIN
class UnicodeSet;
class UStack;
class UVector32;
class DictionaryMatcher;
/*******************************************************************
* LanguageBreakEngine
*/
/**
* <p>LanguageBreakEngines implement language-specific knowledge for
* finding text boundaries within a run of characters belonging to a
* specific set. The boundaries will be of a specific kind, e.g. word,
* line, etc.</p>
*
* <p>LanguageBreakEngines should normally be implemented so as to
* be shared between threads without locking.</p>
*/
class LanguageBreakEngine : public UMemory {
public:
/**
* <p>Default constructor.</p>
*
*/
LanguageBreakEngine();
/**
* <p>Virtual destructor.</p>
*/
virtual ~LanguageBreakEngine();
/**
* <p>Indicate whether this engine handles a particular character for
* a particular kind of break.</p>
*
* @param c A character which begins a run that the engine might handle
* @return TRUE if this engine handles the particular character and break
* type.
*/
virtual UBool handles(UChar32 c) const = 0;
/**
* <p>Find any breaks within a run in the supplied text.</p>
*
* @param text A UText representing the text. The
* iterator is left at the end of the run of characters which the engine
* is capable of handling.
* @param startPos The start of the run within the supplied text.
* @param endPos The end of the run within the supplied text.
* @param foundBreaks A Vector of int32_t to receive the breaks.
* @return The number of breaks found.
*/
virtual int32_t findBreaks( UText *text,
int32_t startPos,
int32_t endPos,
UVector32 &foundBreaks ) const = 0;
};
/*******************************************************************
* LanguageBreakFactory
*/
/**
* <p>LanguageBreakFactorys find and return a LanguageBreakEngine
* that can determine breaks for characters in a specific set, if
* such an object can be found.</p>
*
* <p>If a LanguageBreakFactory is to be shared between threads,
* appropriate synchronization must be used; there is none internal
* to the factory.</p>
*
* <p>A LanguageBreakEngine returned by a LanguageBreakFactory can
* normally be shared between threads without synchronization, unless
* the specific subclass of LanguageBreakFactory indicates otherwise.</p>
*
* <p>A LanguageBreakFactory is responsible for deleting any LanguageBreakEngine
* it returns when it itself is deleted, unless the specific subclass of
* LanguageBreakFactory indicates otherwise. Naturally, the factory should
* not be deleted until the LanguageBreakEngines it has returned are no
* longer needed.</p>
*/
class LanguageBreakFactory : public UMemory {
public:
/**
* <p>Default constructor.</p>
*
*/
LanguageBreakFactory();
/**
* <p>Virtual destructor.</p>
*/
virtual ~LanguageBreakFactory();
/**
* <p>Find and return a LanguageBreakEngine that can find the desired
* kind of break for the set of characters to which the supplied
* character belongs. It is up to the set of available engines to
* determine what the sets of characters are.</p>
*
* @param c A character that begins a run for which a LanguageBreakEngine is
* sought.
* @return A LanguageBreakEngine with the desired characteristics, or 0.
*/
virtual const LanguageBreakEngine *getEngineFor(UChar32 c) = 0;
};
/*******************************************************************
* UnhandledEngine
*/
/**
* <p>UnhandledEngine is a special subclass of LanguageBreakEngine that
* handles characters that no other LanguageBreakEngine is available to
* handle. It is told the character and the type of break; at its
* discretion it may handle more than the specified character (e.g.,
* the entire script to which that character belongs.</p>
*
* <p>UnhandledEngines may not be shared between threads without
* external synchronization.</p>
*/
class UnhandledEngine : public LanguageBreakEngine {
private:
/**
* The sets of characters handled.
* @internal
*/
UnicodeSet *fHandled;
public:
/**
* <p>Default constructor.</p>
*
*/
UnhandledEngine(UErrorCode &status);
/**
* <p>Virtual destructor.</p>
*/
virtual ~UnhandledEngine();
/**
* <p>Indicate whether this engine handles a particular character for
* a particular kind of break.</p>
*
* @param c A character which begins a run that the engine might handle
* @return TRUE if this engine handles the particular character and break
* type.
*/
virtual UBool handles(UChar32 c) const;
/**
* <p>Find any breaks within a run in the supplied text.</p>
*
* @param text A UText representing the text (TODO: UText). The
* iterator is left at the end of the run of characters which the engine
* is capable of handling.
* @param startPos The start of the run within the supplied text.
* @param endPos The end of the run within the supplied text.
* @param foundBreaks An allocated C array of the breaks found, if any
* @return The number of breaks found.
*/
virtual int32_t findBreaks( UText *text,
int32_t startPos,
int32_t endPos,
UVector32 &foundBreaks ) const;
/**
* <p>Tell the engine to handle a particular character and break type.</p>
*
* @param c A character which the engine should handle
*/
virtual void handleCharacter(UChar32 c);
};
/*******************************************************************
* ICULanguageBreakFactory
*/
/**
* <p>ICULanguageBreakFactory is the default LanguageBreakFactory for
* ICU. It creates dictionary-based LanguageBreakEngines from dictionary
* data in the ICU data file.</p>
*/
class ICULanguageBreakFactory : public LanguageBreakFactory {
private:
/**
* The stack of break engines created by this factory
* @internal
*/
UStack *fEngines;
public:
/**
* <p>Standard constructor.</p>
*
*/
ICULanguageBreakFactory(UErrorCode &status);
/**
* <p>Virtual destructor.</p>
*/
virtual ~ICULanguageBreakFactory();
/**
* <p>Find and return a LanguageBreakEngine that can find the desired
* kind of break for the set of characters to which the supplied
* character belongs. It is up to the set of available engines to
* determine what the sets of characters are.</p>
*
* @param c A character that begins a run for which a LanguageBreakEngine is
* sought.
* @return A LanguageBreakEngine with the desired characteristics, or 0.
*/
virtual const LanguageBreakEngine *getEngineFor(UChar32 c);
protected:
/**
* <p>Create a LanguageBreakEngine for the set of characters to which
* the supplied character belongs, for the specified break type.</p>
*
* @param c A character that begins a run for which a LanguageBreakEngine is
* sought.
* @return A LanguageBreakEngine with the desired characteristics, or 0.
*/
virtual const LanguageBreakEngine *loadEngineFor(UChar32 c);
/**
* <p>Create a DictionaryMatcher for the specified script and break type.</p>
* @param script An ISO 15924 script code that identifies the dictionary to be
* created.
* @return A DictionaryMatcher with the desired characteristics, or NULL.
*/
virtual DictionaryMatcher *loadDictionaryMatcherFor(UScriptCode script);
};
U_NAMESPACE_END
/* BRKENG_H */
#endif
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