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Edit File : usetiter.h \| Size : 9.49 KB
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ********************************************************************** * Copyright (c) 2002-2014, International Business Machines * Corporation and others. All Rights Reserved. ********************************************************************** / #ifndef USETITER_H #define USETITER_H #include "unicode/utypes.h" #include "unicode/uobject.h" #include "unicode/unistr.h" /* * \file * \brief C++ API: UnicodeSetIterator iterates over the contents of a UnicodeSet. / U_NAMESPACE_BEGIN class UnicodeSet; class UnicodeString; /* * * UnicodeSetIterator iterates over the contents of a UnicodeSet. It * iterates over either code points or code point ranges. After all * code points or ranges have been returned, it returns the * multicharacter strings of the UnicodeSet, if any. * * This class is not intended to be subclassed. Consider any fields * or methods declared as "protected" to be private. The use of * protected in this class is an artifact of history. * * <p>To iterate over code points and strings, use a loop like this: * <pre> * UnicodeSetIterator it(set); * while (it.next()) { * processItem(it.getString()); * } * </pre> * <p>Each item in the set is accessed as a string. Set elements * consisting of single code points are returned as strings containing * just the one code point. * * <p>To iterate over code point ranges, instead of individual code points, * use a loop like this: * <pre> * UnicodeSetIterator it(set); * while (it.nextRange()) { * if (it.isString()) { * processString(it.getString()); * } else { * processCodepointRange(it.getCodepoint(), it.getCodepointEnd()); * } * } * </pre> * @author M. Davis * @stable ICU 2.4 / class U_COMMON_API UnicodeSetIterator : public UObject { protected: /* * Value of <tt>codepoint</tt> if the iterator points to a string. * If <tt>codepoint == IS_STRING</tt>, then examine * <tt>string</tt> for the current iteration result. * @stable ICU 2.4 / enum { IS_STRING = -1 }; /* * Current code point, or the special value <tt>IS_STRING</tt>, if * the iterator points to a string. * @stable ICU 2.4 / UChar32 codepoint; /* * When iterating over ranges using <tt>nextRange()</tt>, * <tt>codepointEnd</tt> contains the inclusive end of the * iteration range, if <tt>codepoint != IS_STRING</tt>. If * iterating over code points using <tt>next()</tt>, or if * <tt>codepoint == IS_STRING</tt>, then the value of * <tt>codepointEnd</tt> is undefined. * @stable ICU 2.4 / UChar32 codepointEnd; /* * If <tt>codepoint == IS_STRING</tt>, then <tt>string</tt> points * to the current string. If <tt>codepoint != IS_STRING</tt>, the * value of <tt>string</tt> is undefined. * @stable ICU 2.4 / const UnicodeString string; public: /** * Create an iterator over the given set. The iterator is valid * only so long as <tt>set</tt> is valid. * @param set set to iterate over * @stable ICU 2.4 / UnicodeSetIterator(const UnicodeSet& set); /* * Create an iterator over nothing. <tt>next()</tt> and * <tt>nextRange()</tt> return false. This is a convenience * constructor allowing the target to be set later. * @stable ICU 2.4 / UnicodeSetIterator(); /* * Destructor. * @stable ICU 2.4 / virtual ~UnicodeSetIterator(); /* * Returns true if the current element is a string. If so, the * caller can retrieve it with <tt>getString()</tt>. If this * method returns false, the current element is a code point or * code point range, depending on whether <tt>next()</tt> or * <tt>nextRange()</tt> was called. * Elements of types string and codepoint can both be retrieved * with the function <tt>getString()</tt>. * Elements of type codepoint can also be retrieved with * <tt>getCodepoint()</tt>. * For ranges, <tt>getCodepoint()</tt> returns the starting codepoint * of the range, and <tt>getCodepointEnd()</tt> returns the end * of the range. * @stable ICU 2.4 / inline UBool isString() const; /* * Returns the current code point, if <tt>isString()</tt> returned * false. Otherwise returns an undefined result. * @stable ICU 2.4 / inline UChar32 getCodepoint() const; /* * Returns the end of the current code point range, if * <tt>isString()</tt> returned false and <tt>nextRange()</tt> was * called. Otherwise returns an undefined result. * @stable ICU 2.4 / inline UChar32 getCodepointEnd() const; /* * Returns the current string, if <tt>isString()</tt> returned * true. If the current iteration item is a code point, a UnicodeString * containing that single code point is returned. * * Ownership of the returned string remains with the iterator. * The string is guaranteed to remain valid only until the iterator is * advanced to the next item, or until the iterator is deleted. * * @stable ICU 2.4 / const UnicodeString& getString(); /* * Advances the iteration position to the next element in the set, * which can be either a single code point or a string. * If there are no more elements in the set, return false. * * <p> * If <tt>isString() == TRUE</tt>, the value is a * string, otherwise the value is a * single code point. Elements of either type can be retrieved * with the function <tt>getString()</tt>, while elements of * consisting of a single code point can be retrieved with * <tt>getCodepoint()</tt> * * <p>The order of iteration is all code points in sorted order, * followed by all strings sorted order. Do not mix * calls to <tt>next()</tt> and <tt>nextRange()</tt> without * calling <tt>reset()</tt> between them. The results of doing so * are undefined. * * @return true if there was another element in the set. * @stable ICU 2.4 / UBool next(); /* * Returns the next element in the set, either a code point range * or a string. If there are no more elements in the set, return * false. If <tt>isString() == TRUE</tt>, the value is a * string and can be accessed with <tt>getString()</tt>. Otherwise the value is a * range of one or more code points from <tt>getCodepoint()</tt> to * <tt>getCodepointeEnd()</tt> inclusive. * * <p>The order of iteration is all code points ranges in sorted * order, followed by all strings sorted order. Ranges are * disjoint and non-contiguous. The value returned from <tt>getString()</tt> * is undefined unless <tt>isString() == TRUE</tt>. Do not mix calls to * <tt>next()</tt> and <tt>nextRange()</tt> without calling * <tt>reset()</tt> between them. The results of doing so are * undefined. * * @return true if there was another element in the set. * @stable ICU 2.4 / UBool nextRange(); /* * Sets this iterator to visit the elements of the given set and * resets it to the start of that set. The iterator is valid only * so long as <tt>set</tt> is valid. * @param set the set to iterate over. * @stable ICU 2.4 / void reset(const UnicodeSet& set); /* * Resets this iterator to the start of the set. * @stable ICU 2.4 / void reset(); /* * ICU "poor man's RTTI", returns a UClassID for this class. * * @stable ICU 2.4 / static UClassID U_EXPORT2 getStaticClassID(); /* * ICU "poor man's RTTI", returns a UClassID for the actual class. * * @stable ICU 2.4 / virtual UClassID getDynamicClassID() const; // ======================= PRIVATES =========================== protected: // endElement and nextElements are really UChar32's, but we keep // them as signed int32_t's so we can do comparisons with // endElement set to -1. Leave them as int32_t's. /* The set * @stable ICU 2.4 / const UnicodeSet set; /** End range * @stable ICU 2.4 / int32_t endRange; /* Range * @stable ICU 2.4 / int32_t range; /* End element * @stable ICU 2.4 / int32_t endElement; /* Next element * @stable ICU 2.4 / int32_t nextElement; //UBool abbreviated; /* Next string * @stable ICU 2.4 / int32_t nextString; /* String count * @stable ICU 2.4 / int32_t stringCount; /* * Points to the string to use when the caller asks for a * string and the current iteration item is a code point, not a string. * @internal / UnicodeString cpString; /** Copy constructor. Disallowed. * @stable ICU 2.4 / UnicodeSetIterator(const UnicodeSetIterator&); // disallow /* Assignment operator. Disallowed. * @stable ICU 2.4 / UnicodeSetIterator& operator=(const UnicodeSetIterator&); // disallow /* Load range * @stable ICU 2.4 */ virtual void loadRange(int32_t range); }; inline UBool UnicodeSetIterator::isString() const { return codepoint == (UChar32)IS_STRING; } inline UChar32 UnicodeSetIterator::getCodepoint() const { return codepoint; } inline UChar32 UnicodeSetIterator::getCodepointEnd() const { return codepointEnd; } U_NAMESPACE_END #endif Back

Edit File : usetiter.h | Size : 9.49 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (c) 2002-2014, International Business Machines
* Corporation and others.  All Rights Reserved.
**********************************************************************
*/
#ifndef USETITER_H
#define USETITER_H

#include "unicode/utypes.h"
#include "unicode/uobject.h"
#include "unicode/unistr.h"

/**
 * \file 
 * \brief C++ API: UnicodeSetIterator iterates over the contents of a UnicodeSet.
 */

U_NAMESPACE_BEGIN

class UnicodeSet;
class UnicodeString;

/**
 *
 * UnicodeSetIterator iterates over the contents of a UnicodeSet. It
 * iterates over either code points or code point ranges. After all
 * code points or ranges have been returned, it returns the
 * multicharacter strings of the UnicodeSet, if any.
 *
 * This class is not intended to be subclassed. Consider any fields
 * or methods declared as "protected" to be private. The use of
 * protected in this class is an artifact of history.
 *
 * To iterate over code points and strings, use a loop like this:
 * <pre>
 * UnicodeSetIterator it(set);
 * while (it.next()) {
 * processItem(it.getString());
 * }
 * </pre>
 * Each item in the set is accessed as a string. Set elements
 * consisting of single code points are returned as strings containing
 * just the one code point.
 *
 * To iterate over code point ranges, instead of individual code points,
 * use a loop like this:
 * <pre>
 * UnicodeSetIterator it(set);
 * while (it.nextRange()) {
 * if (it.isString()) {
 * processString(it.getString());
 * } else {
 * processCodepointRange(it.getCodepoint(), it.getCodepointEnd());
 * }
 * }
 * </pre>
 * @author M. Davis
 * @stable ICU 2.4
 */
class U_COMMON_API UnicodeSetIterator : public UObject {

protected:

/**
 * Value of <tt>codepoint</tt> if the iterator points to a string.
 * If <tt>codepoint == IS_STRING</tt>, then examine
 * <tt>string</tt> for the current iteration result.
 * @stable ICU 2.4
 */
 enum { IS_STRING = -1 };

/**
 * Current code point, or the special value <tt>IS_STRING</tt>, if
 * the iterator points to a string.
 * @stable ICU 2.4
 */
 UChar32 codepoint;

/**
 * When iterating over ranges using <tt>nextRange()</tt>,
 * <tt>codepointEnd</tt> contains the inclusive end of the
 * iteration range, if <tt>codepoint != IS_STRING</tt>. If
 * iterating over code points using <tt>next()</tt>, or if
 * <tt>codepoint == IS_STRING</tt>, then the value of
 * <tt>codepointEnd</tt> is undefined.
 * @stable ICU 2.4
 */
 UChar32 codepointEnd;

/**
 * If <tt>codepoint == IS_STRING</tt>, then <tt>string</tt> points
 * to the current string. If <tt>codepoint != IS_STRING</tt>, the
 * value of <tt>string</tt> is undefined.
 * @stable ICU 2.4
 */
 const UnicodeString* string;

public:

/**
 * Create an iterator over the given set. The iterator is valid
 * only so long as <tt>set</tt> is valid.
 * @param set set to iterate over
 * @stable ICU 2.4
 */
 UnicodeSetIterator(const UnicodeSet& set);

/**
 * Create an iterator over nothing. <tt>next()</tt> and
 * <tt>nextRange()</tt> return false. This is a convenience
 * constructor allowing the target to be set later.
 * @stable ICU 2.4
 */
 UnicodeSetIterator();

/**
     * Destructor.
     * @stable ICU 2.4
     */
    virtual ~UnicodeSetIterator();

/**
 * Returns true if the current element is a string. If so, the
 * caller can retrieve it with <tt>getString()</tt>. If this
 * method returns false, the current element is a code point or
 * code point range, depending on whether <tt>next()</tt> or
 * <tt>nextRange()</tt> was called.
 * Elements of types string and codepoint can both be retrieved
 * with the function <tt>getString()</tt>.
 * Elements of type codepoint can also be retrieved with
 * <tt>getCodepoint()</tt>.
 * For ranges, <tt>getCodepoint()</tt> returns the starting codepoint
 * of the range, and <tt>getCodepointEnd()</tt> returns the end
 * of the range.
 * @stable ICU 2.4
 */
 inline UBool isString() const;

/**
 * Returns the current code point, if <tt>isString()</tt> returned
 * false. Otherwise returns an undefined result.
 * @stable ICU 2.4
 */
 inline UChar32 getCodepoint() const;

/**
 * Returns the end of the current code point range, if
 * <tt>isString()</tt> returned false and <tt>nextRange()</tt> was
 * called. Otherwise returns an undefined result.
 * @stable ICU 2.4
 */
 inline UChar32 getCodepointEnd() const;

/**
 * Returns the current string, if <tt>isString()</tt> returned
 * true. If the current iteration item is a code point, a UnicodeString
 * containing that single code point is returned.
 *
 * Ownership of the returned string remains with the iterator.
 * The string is guaranteed to remain valid only until the iterator is
 * advanced to the next item, or until the iterator is deleted.
 * 
 * @stable ICU 2.4
 */
 const UnicodeString& getString();

/**
 * Advances the iteration position to the next element in the set, 
 * which can be either a single code point or a string. 
 * If there are no more elements in the set, return false.
 *
 * 
 * If <tt>isString() == TRUE</tt>, the value is a
 * string, otherwise the value is a
 * single code point. Elements of either type can be retrieved
 * with the function <tt>getString()</tt>, while elements of
 * consisting of a single code point can be retrieved with
 * <tt>getCodepoint()</tt>
 *
 * The order of iteration is all code points in sorted order,
 * followed by all strings sorted order. Do not mix
 * calls to <tt>next()</tt> and <tt>nextRange()</tt> without
 * calling <tt>reset()</tt> between them. The results of doing so
 * are undefined.
 *
 * @return true if there was another element in the set.
 * @stable ICU 2.4
 */
 UBool next();

/**
 * Returns the next element in the set, either a code point range
 * or a string. If there are no more elements in the set, return
 * false. If <tt>isString() == TRUE</tt>, the value is a
 * string and can be accessed with <tt>getString()</tt>. Otherwise the value is a
 * range of one or more code points from <tt>getCodepoint()</tt> to
 * <tt>getCodepointeEnd()</tt> inclusive.
 *
 * The order of iteration is all code points ranges in sorted
 * order, followed by all strings sorted order. Ranges are
 * disjoint and non-contiguous. The value returned from <tt>getString()</tt>
 * is undefined unless <tt>isString() == TRUE</tt>. Do not mix calls to
 * <tt>next()</tt> and <tt>nextRange()</tt> without calling
 * <tt>reset()</tt> between them. The results of doing so are
 * undefined.
 *
 * @return true if there was another element in the set.
 * @stable ICU 2.4
 */
 UBool nextRange();

/**
 * Sets this iterator to visit the elements of the given set and
 * resets it to the start of that set. The iterator is valid only
 * so long as <tt>set</tt> is valid.
 * @param set the set to iterate over.
 * @stable ICU 2.4
 */
 void reset(const UnicodeSet& set);

/**
     * Resets this iterator to the start of the set.
     * @stable ICU 2.4
     */
    void reset();

/**
     * ICU "poor man's RTTI", returns a UClassID for this class.
     *
     * @stable ICU 2.4
     */
    static UClassID U_EXPORT2 getStaticClassID();

/**
     * ICU "poor man's RTTI", returns a UClassID for the actual class.
     *
     * @stable ICU 2.4
     */
    virtual UClassID getDynamicClassID() const;

// ======================= PRIVATES ===========================

protected:

// endElement and nextElements are really UChar32's, but we keep
    // them as signed int32_t's so we can do comparisons with
    // endElement set to -1.  Leave them as int32_t's.
    /** The set
     * @stable ICU 2.4
     */
    const UnicodeSet* set;
    /** End range
     * @stable ICU 2.4
     */
    int32_t endRange;
    /** Range
     * @stable ICU 2.4
     */
    int32_t range;
    /** End element
     * @stable ICU 2.4
     */
    int32_t endElement;
    /** Next element
     * @stable ICU 2.4
     */
    int32_t nextElement;
    //UBool abbreviated;
    /** Next string
     * @stable ICU 2.4
     */
    int32_t nextString;
    /** String count
     * @stable ICU 2.4
     */
    int32_t stringCount;

/**
     *  Points to the string to use when the caller asks for a
     *  string and the current iteration item is a code point, not a string.
     *  @internal
     */
    UnicodeString *cpString;

/** Copy constructor. Disallowed.
     * @stable ICU 2.4
     */
    UnicodeSetIterator(const UnicodeSetIterator&); // disallow

/** Assignment operator. Disallowed.
     * @stable ICU 2.4
     */
    UnicodeSetIterator& operator=(const UnicodeSetIterator&); // disallow

/** Load range
     * @stable ICU 2.4
     */
    virtual void loadRange(int32_t range);

};

inline UBool UnicodeSetIterator::isString() const {
    return codepoint == (UChar32)IS_STRING;
}

inline UChar32 UnicodeSetIterator::getCodepoint() const {
    return codepoint;
}

inline UChar32 UnicodeSetIterator::getCodepointEnd() const {
    return codepointEnd;
}

U_NAMESPACE_END

#endif

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