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+/**
+ ************************************************************************************
+ * Copyright (C) 2006-2007, 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 CompactTrieDictionary;
+
+/*******************************************************************
+ * 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
+ * @param breakType The type of text break which the caller wants to determine
+ * @return TRUE if this engine handles the particular character and break
+ * type.
+ */
+ virtual UBool handles(UChar32 c, int32_t breakType) 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 reverse Whether the caller is looking for breaks in a reverse
+ * direction.
+ * @param breakType The type of break desired, or -1.
+ * @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,
+ UBool reverse,
+ int32_t breakType,
+ UStack &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.
+ * @param breakType The kind of text break for which a LanguageBreakEngine is
+ * sought.
+ * @return A LanguageBreakEngine with the desired characteristics, or 0.
+ */
+ virtual const LanguageBreakEngine *getEngineFor(UChar32 c, int32_t breakType) = 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, for each break type
+ * @internal
+ */
+
+ UnicodeSet *fHandled[4];
+
+ 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
+ * @param breakType The type of text break which the caller wants to determine
+ * @return TRUE if this engine handles the particular character and break
+ * type.
+ */
+ virtual UBool handles(UChar32 c, int32_t breakType) 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 reverse Whether the caller is looking for breaks in a reverse
+ * direction.
+ * @param breakType The type of break desired, or -1.
+ * @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,
+ UBool reverse,
+ int32_t breakType,
+ UStack &foundBreaks ) const;
+
+ /**
+ * <p>Tell the engine to handle a particular character and break type.</p>
+ *
+ * @param c A character which the engine should handle
+ * @param breakType The type of text break for which the engine should handle c
+ */
+ virtual void handleCharacter(UChar32 c, int32_t breakType);
+
+};
+
+/*******************************************************************
+ * 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.
+ * @param breakType The kind of text break for which a LanguageBreakEngine is
+ * sought.
+ * @return A LanguageBreakEngine with the desired characteristics, or 0.
+ */
+ virtual const LanguageBreakEngine *getEngineFor(UChar32 c, int32_t breakType);
+
+ 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.
+ * @param breakType The kind of text break for which a LanguageBreakEngine is
+ * sought.
+ * @return A LanguageBreakEngine with the desired characteristics, or 0.
+ */
+ virtual const LanguageBreakEngine *loadEngineFor(UChar32 c, int32_t breakType);
+
+ /**
+ * <p>Create a CompactTrieDictionary for the specified script and break type.</p>
+ *
+ * @param script An ISO 15924 script code that identifies the dictionary to be
+ * created.
+ * @param breakType The kind of text break for which a dictionary is
+ * sought.
+ * @return A CompactTrieDictionary with the desired characteristics, or 0.
+ */
+ virtual const CompactTrieDictionary *loadDictionaryFor(UScriptCode script, int32_t breakType);
+
+};
+
+U_NAMESPACE_END
+
+ /* BRKENG_H */
+#endif