<h2>Editing File: /opt/alt/libicu/usr/include/unicode/plurfmt.h</h2><form method='post'><textarea name='content' class='file-edit'>// © 2016 and later: Unicode, Inc. and others.
// License &amp; terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2007-2014, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*

* File PLURFMT.H
********************************************************************************
*/

#ifndef PLURFMT
#define PLURFMT

#include &quot;unicode/utypes.h&quot;

/**
 * \file
 * \brief C++ API: PluralFormat object
 */

#if !UCONFIG_NO_FORMATTING

#include &quot;unicode/messagepattern.h&quot;
#include &quot;unicode/numfmt.h&quot;
#include &quot;unicode/plurrule.h&quot;

U_NAMESPACE_BEGIN

class Hashtable;
class NFRule;

/**
 * &lt;p&gt;
 * &lt;code&gt;PluralFormat&lt;/code&gt; supports the creation of internationalized
 * messages with plural inflection. It is based on &lt;i&gt;plural
 * selection&lt;/i&gt;, i.e. the caller specifies messages for each
 * plural case that can appear in the user's language and the
 * &lt;code&gt;PluralFormat&lt;/code&gt; selects the appropriate message based on
 * the number.
 * &lt;/p&gt;
 * &lt;h4&gt;The Problem of Plural Forms in Internationalized Messages&lt;/h4&gt;
 * &lt;p&gt;
 * Different languages have different ways to inflect
 * plurals. Creating internationalized messages that include plural
 * forms is only feasible when the framework is able to handle plural
 * forms of &lt;i&gt;all&lt;/i&gt; languages correctly. &lt;code&gt;ChoiceFormat&lt;/code&gt;
 * doesn't handle this well, because it attaches a number interval to
 * each message and selects the message whose interval contains a
 * given number. This can only handle a finite number of
 * intervals. But in some languages, like Polish, one plural case
 * applies to infinitely many intervals (e.g., the plural case applies to
 * numbers ending with 2, 3, or 4 except those ending with 12, 13, or
 * 14). Thus &lt;code&gt;ChoiceFormat&lt;/code&gt; is not adequate.
 * &lt;/p&gt;&lt;p&gt;
 * &lt;code&gt;PluralFormat&lt;/code&gt; deals with this by breaking the problem
 * into two parts:
 * &lt;ul&gt;
 * &lt;li&gt;It uses &lt;code&gt;PluralRules&lt;/code&gt; that can define more complex
 *     conditions for a plural case than just a single interval. These plural
 *     rules define both what plural cases exist in a language, and to
 *     which numbers these cases apply.
 * &lt;li&gt;It provides predefined plural rules for many languages. Thus, the programmer
 *     need not worry about the plural cases of a language and
 *     does not have to define the plural cases; they can simply
 *     use the predefined keywords. The whole plural formatting of messages can
 *     be done using localized patterns from resource bundles. For predefined plural
 *     rules, see the CLDR &lt;i&gt;Language Plural Rules&lt;/i&gt; page at
 *    http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
 * &lt;/ul&gt;
 * &lt;/p&gt;
 * &lt;h4&gt;Usage of &lt;code&gt;PluralFormat&lt;/code&gt;&lt;/h4&gt;
 * &lt;p&gt;Note: Typically, plural formatting is done via &lt;code&gt;MessageFormat&lt;/code&gt;
 * with a &lt;code&gt;plural&lt;/code&gt; argument type,
 * rather than using a stand-alone &lt;code&gt;PluralFormat&lt;/code&gt;.
 * &lt;/p&gt;&lt;p&gt;
 * This discussion assumes that you use &lt;code&gt;PluralFormat&lt;/code&gt; with
 * a predefined set of plural rules. You can create one using one of
 * the constructors that takes a &lt;code&gt;locale&lt;/code&gt; object. To
 * specify the message pattern, you can either pass it to the
 * constructor or set it explicitly using the
 * &lt;code&gt;applyPattern()&lt;/code&gt; method. The &lt;code&gt;format()&lt;/code&gt;
 * method takes a number object and selects the message of the
 * matching plural case. This message will be returned.
 * &lt;/p&gt;
 * &lt;h5&gt;Patterns and Their Interpretation&lt;/h5&gt;
 * &lt;p&gt;
 * The pattern text defines the message output for each plural case of the
 * specified locale. Syntax:
 * &lt;pre&gt;
 * pluralStyle = [offsetValue] (selector '{' message '}')+
 * offsetValue = &quot;offset:&quot; number
 * selector = explicitValue | keyword
 * explicitValue = '=' number  // adjacent, no white space in between
 * keyword = [^[[:Pattern_Syntax:][:Pattern_White_Space:]]]+
 * message: see {@link MessageFormat}
 * &lt;/pre&gt;
 * Pattern_White_Space between syntax elements is ignored, except
 * between the {curly braces} and their sub-message,
 * and between the '=' and the number of an explicitValue.
 *
 * &lt;/p&gt;&lt;p&gt;
 * There are 6 predefined casekeyword in CLDR/ICU - 'zero', 'one', 'two', 'few', 'many' and
 * 'other'. You always have to define a message text for the default plural case
 * &lt;code&gt;other&lt;/code&gt; which is contained in every rule set.
 * If you do not specify a message text for a particular plural case, the
 * message text of the plural case &lt;code&gt;other&lt;/code&gt; gets assigned to this
 * plural case.
 * &lt;/p&gt;&lt;p&gt;
 * When formatting, the input number is first matched against the explicitValue clauses.
 * If there is no exact-number match, then a keyword is selected by calling
 * the &lt;code&gt;PluralRules&lt;/code&gt; with the input number &lt;em&gt;minus the offset&lt;/em&gt;.
 * (The offset defaults to 0 if it is omitted from the pattern string.)
 * If there is no clause with that keyword, then the &quot;other&quot; clauses is returned.
 * &lt;/p&gt;&lt;p&gt;
 * An unquoted pound sign (&lt;code&gt;#&lt;/code&gt;) in the selected sub-message
 * itself (i.e., outside of arguments nested in the sub-message)
 * is replaced by the input number minus the offset.
 * The number-minus-offset value is formatted using a
 * &lt;code&gt;NumberFormat&lt;/code&gt; for the &lt;code&gt;PluralFormat&lt;/code&gt;'s locale. If you
 * need special number formatting, you have to use a &lt;code&gt;MessageFormat&lt;/code&gt;
 * and explicitly specify a &lt;code&gt;NumberFormat&lt;/code&gt; argument.
 * &lt;strong&gt;Note:&lt;/strong&gt; That argument is formatting without subtracting the offset!
 * If you need a custom format and have a non-zero offset, then you need to pass the
 * number-minus-offset value as a separate parameter.
 * &lt;/p&gt;
 * For a usage example, see the {@link MessageFormat} class documentation.
 *
 * &lt;h4&gt;Defining Custom Plural Rules&lt;/h4&gt;
 * &lt;p&gt;If you need to use &lt;code&gt;PluralFormat&lt;/code&gt; with custom rules, you can
 * create a &lt;code&gt;PluralRules&lt;/code&gt; object and pass it to
 * &lt;code&gt;PluralFormat&lt;/code&gt;'s constructor. If you also specify a locale in this
 * constructor, this locale will be used to format the number in the message
 * texts.
 * &lt;/p&gt;&lt;p&gt;
 * For more information about &lt;code&gt;PluralRules&lt;/code&gt;, see
 * {@link PluralRules}.
 * &lt;/p&gt;
 *
 * ported from Java
 * @stable ICU 4.0
 */

class U_I18N_API PluralFormat : public Format {
public:

    /**
     * Creates a new cardinal-number &lt;code&gt;PluralFormat&lt;/code&gt; for the default locale.
     * This locale will be used to get the set of plural rules and for standard
     * number formatting.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(UErrorCode&amp; status);

    /**
     * Creates a new cardinal-number &lt;code&gt;PluralFormat&lt;/code&gt; for a given locale.
     * @param locale the &lt;code&gt;PluralFormat&lt;/code&gt; will be configured with
     *               rules for this locale. This locale will also be used for
     *               standard number formatting.
     * @param status output param set to success/failure code on exit, which
     *               must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(const Locale&amp; locale, UErrorCode&amp; status);

    /**
     * Creates a new &lt;code&gt;PluralFormat&lt;/code&gt; for a given set of rules.
     * The standard number formatting will be done using the default locale.
     * @param rules   defines the behavior of the &lt;code&gt;PluralFormat&lt;/code&gt;
     *                object.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(const PluralRules&amp; rules, UErrorCode&amp; status);

    /**
     * Creates a new &lt;code&gt;PluralFormat&lt;/code&gt; for a given set of rules.
     * The standard number formatting will be done using the given locale.
     * @param locale  the default number formatting will be done using this
     *                locale.
     * @param rules   defines the behavior of the &lt;code&gt;PluralFormat&lt;/code&gt;
     *                object.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 4.0
	 * &lt;p&gt;
	 * &lt;h4&gt;Sample code&lt;/h4&gt;
	 * \snippet samples/plurfmtsample/plurfmtsample.cpp PluralFormatExample1
	 * \snippet samples/plurfmtsample/plurfmtsample.cpp PluralFormatExample
	 * &lt;p&gt;
     */
    PluralFormat(const Locale&amp; locale, const PluralRules&amp; rules, UErrorCode&amp; status);

    /**
     * Creates a new &lt;code&gt;PluralFormat&lt;/code&gt; for the plural type.
     * The standard number formatting will be done using the given locale.
     * @param locale  the default number formatting will be done using this
     *                locale.
     * @param type    The plural type (e.g., cardinal or ordinal).
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 50
     */
    PluralFormat(const Locale&amp; locale, UPluralType type, UErrorCode&amp; status);

    /**
     * Creates a new cardinal-number &lt;code&gt;PluralFormat&lt;/code&gt; for a given pattern string.
     * The default locale will be used to get the set of plural rules and for
     * standard number formatting.
     * @param  pattern the pattern for this &lt;code&gt;PluralFormat&lt;/code&gt;.
     *                 errors are returned to status if the pattern is invalid.
     * @param status   output param set to success/failure code on exit, which
     *                 must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(const UnicodeString&amp; pattern, UErrorCode&amp; status);

    /**
     * Creates a new cardinal-number &lt;code&gt;PluralFormat&lt;/code&gt; for a given pattern string and
     * locale.
     * The locale will be used to get the set of plural rules and for
     * standard number formatting.
     * @param locale   the &lt;code&gt;PluralFormat&lt;/code&gt; will be configured with
     *                 rules for this locale. This locale will also be used for
     *                 standard number formatting.
     * @param pattern  the pattern for this &lt;code&gt;PluralFormat&lt;/code&gt;.
     *                 errors are returned to status if the pattern is invalid.
     * @param status   output param set to success/failure code on exit, which
     *                 must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(const Locale&amp; locale, const UnicodeString&amp; pattern, UErrorCode&amp; status);

    /**
     * Creates a new &lt;code&gt;PluralFormat&lt;/code&gt; for a given set of rules, a
     * pattern and a locale.
     * @param rules    defines the behavior of the &lt;code&gt;PluralFormat&lt;/code&gt;
     *                 object.
     * @param pattern  the pattern for this &lt;code&gt;PluralFormat&lt;/code&gt;.
     *                 errors are returned to status if the pattern is invalid.
     * @param status   output param set to success/failure code on exit, which
     *                 must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(const PluralRules&amp; rules,
                 const UnicodeString&amp; pattern,
                 UErrorCode&amp; status);

    /**
     * Creates a new &lt;code&gt;PluralFormat&lt;/code&gt; for a given set of rules, a
     * pattern and a locale.
     * @param locale  the &lt;code&gt;PluralFormat&lt;/code&gt; will be configured with
     *                rules for this locale. This locale will also be used for
     *                standard number formatting.
     * @param rules   defines the behavior of the &lt;code&gt;PluralFormat&lt;/code&gt;
     *                object.
     * @param pattern the pattern for this &lt;code&gt;PluralFormat&lt;/code&gt;.
     *                errors are returned to status if the pattern is invalid.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    PluralFormat(const Locale&amp; locale,
                 const PluralRules&amp; rules,
                 const UnicodeString&amp; pattern,
                 UErrorCode&amp; status);

    /**
     * Creates a new &lt;code&gt;PluralFormat&lt;/code&gt; for a plural type, a
     * pattern and a locale.
     * @param locale  the &lt;code&gt;PluralFormat&lt;/code&gt; will be configured with
     *                rules for this locale. This locale will also be used for
     *                standard number formatting.
     * @param type    The plural type (e.g., cardinal or ordinal).
     * @param pattern the pattern for this &lt;code&gt;PluralFormat&lt;/code&gt;.
     *                errors are returned to status if the pattern is invalid.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 50
     */
    PluralFormat(const Locale&amp; locale,
                 UPluralType type,
                 const UnicodeString&amp; pattern,
                 UErrorCode&amp; status);

    /**
      * copy constructor.
      * @stable ICU 4.0
      */
    PluralFormat(const PluralFormat&amp; other);

    /**
     * Destructor.
     * @stable ICU 4.0
     */
    virtual ~PluralFormat();

    /**
     * Sets the pattern used by this plural format.
     * The method parses the pattern and creates a map of format strings
     * for the plural rules.
     * Patterns and their interpretation are specified in the class description.
     *
     * @param pattern the pattern for this plural format
     *                errors are returned to status if the pattern is invalid.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @stable ICU 4.0
     */
    void applyPattern(const UnicodeString&amp; pattern, UErrorCode&amp; status);


    using Format::format;

    /**
     * Formats a plural message for a given number.
     *
     * @param number  a number for which the plural message should be formatted
     *                for. If no pattern has been applied to this
     *                &lt;code&gt;PluralFormat&lt;/code&gt; object yet, the formatted number
     *                will be returned.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @return        the string containing the formatted plural message.
     * @stable ICU 4.0
     */
    UnicodeString format(int32_t number, UErrorCode&amp; status) const;

    /**
     * Formats a plural message for a given number.
     *
     * @param number  a number for which the plural message should be formatted
     *                for. If no pattern has been applied to this
     *                PluralFormat object yet, the formatted number
     *                will be returned.
     * @param status  output param set to success or failure code on exit, which
     *                must not indicate a failure before the function call.
     * @return        the string containing the formatted plural message.
     * @stable ICU 4.0
     */
    UnicodeString format(double number, UErrorCode&amp; status) const;

    /**
     * Formats a plural message for a given number.
     *
     * @param number   a number for which the plural message should be formatted
     *                 for. If no pattern has been applied to this
     *                 &lt;code&gt;PluralFormat&lt;/code&gt; object yet, the formatted number
     *                 will be returned.
     * @param appendTo output parameter to receive result.
     *                 result is appended to existing contents.
     * @param pos      On input: an alignment field, if desired.
     *                 On output: the offsets of the alignment field.
     * @param status   output param set to success/failure code on exit, which
     *                 must not indicate a failure before the function call.
     * @return         the string containing the formatted plural message.
     * @stable ICU 4.0
     */
    UnicodeString&amp; format(int32_t number,
                          UnicodeString&amp; appendTo,
                          FieldPosition&amp; pos,
                          UErrorCode&amp; status) const;

    /**
     * Formats a plural message for a given number.
     *
     * @param number   a number for which the plural message should be formatted
     *                 for. If no pattern has been applied to this
     *                 PluralFormat object yet, the formatted number
     *                 will be returned.
     * @param appendTo output parameter to receive result.
     *                 result is appended to existing contents.
     * @param pos      On input: an alignment field, if desired.
     *                 On output: the offsets of the alignment field.
     * @param status   output param set to success/failure code on exit, which
     *                 must not indicate a failure before the function call.
     * @return         the string containing the formatted plural message.
     * @stable ICU 4.0
     */
    UnicodeString&amp; format(double number,
                          UnicodeString&amp; appendTo,
                          FieldPosition&amp; pos,
                          UErrorCode&amp; status) const;

#ifndef U_HIDE_DEPRECATED_API 
    /**
     * Sets the locale used by this &lt;code&gt;PluraFormat&lt;/code&gt; object.
     * Note: Calling this method resets this &lt;code&gt;PluraFormat&lt;/code&gt; object,
     *     i.e., a pattern that was applied previously will be removed,
     *     and the NumberFormat is set to the default number format for
     *     the locale.  The resulting format behaves the same as one
     *     constructed from {@link #PluralFormat(const Locale&amp; locale, UPluralType type, UErrorCode&amp; status)}
     *     with UPLURAL_TYPE_CARDINAL.
     * @param locale  the &lt;code&gt;locale&lt;/code&gt; to use to configure the formatter.
     * @param status  output param set to success/failure code on exit, which
     *                must not indicate a failure before the function call.
     * @deprecated ICU 50 This method clears the pattern and might create
     *             a different kind of PluralRules instance;
     *             use one of the constructors to create a new instance instead.
     */
    void setLocale(const Locale&amp; locale, UErrorCode&amp; status);
#endif  /* U_HIDE_DEPRECATED_API */

    /**
      * Sets the number format used by this formatter.  You only need to
      * call this if you want a different number format than the default
      * formatter for the locale.
      * @param format  the number format to use.
      * @param status  output param set to success/failure code on exit, which
      *                must not indicate a failure before the function call.
      * @stable ICU 4.0
      */
    void setNumberFormat(const NumberFormat* format, UErrorCode&amp; status);

    /**
       * Assignment operator
       *
       * @param other    the PluralFormat object to copy from.
       * @stable ICU 4.0
       */
    PluralFormat&amp; operator=(const PluralFormat&amp; other);

    /**
      * Return true if another object is semantically equal to this one.
      *
      * @param other    the PluralFormat object to be compared with.
      * @return         true if other is semantically equal to this.
      * @stable ICU 4.0
      */
    virtual UBool operator==(const Format&amp; other) const;

    /**
     * Return true if another object is semantically unequal to this one.
     *
     * @param other    the PluralFormat object to be compared with.
     * @return         true if other is semantically unequal to this.
     * @stable ICU 4.0
     */
    virtual UBool operator!=(const Format&amp; other) const;

    /**
     * Clones this Format object polymorphically.  The caller owns the
     * result and should delete it when done.
     * @stable ICU 4.0
     */
    virtual Format* clone(void) const;

   /**
    * Formats a plural message for a number taken from a Formattable object.
    *
    * @param obj       The object containing a number for which the 
    *                  plural message should be formatted.
    *                  The object must be of a numeric type.
    * @param appendTo  output parameter to receive result.
    *                  Result is appended to existing contents.
    * @param pos       On input: an alignment field, if desired.
    *                  On output: the offsets of the alignment field.
    * @param status    output param filled with success/failure status.
    * @return          Reference to 'appendTo' parameter.
    * @stable ICU 4.0
    */
   UnicodeString&amp; format(const Formattable&amp; obj,
                         UnicodeString&amp; appendTo,
                         FieldPosition&amp; pos,
                         UErrorCode&amp; status) const;

   /**
    * Returns the pattern from applyPattern() or constructor().
    *
    * @param  appendTo  output parameter to receive result.
     *                  Result is appended to existing contents.
    * @return the UnicodeString with inserted pattern.
    * @stable ICU 4.0
    */
   UnicodeString&amp; toPattern(UnicodeString&amp; appendTo);

   /**
    * This method is not yet supported by &lt;code&gt;PluralFormat&lt;/code&gt;.
    * &lt;P&gt;
    * Before calling, set parse_pos.index to the offset you want to start
    * parsing at in the source. After calling, parse_pos.index is the end of
    * the text you parsed. If error occurs, index is unchanged.
    * &lt;P&gt;
    * When parsing, leading whitespace is discarded (with a successful parse),
    * while trailing whitespace is left as is.
    * &lt;P&gt;
    * See Format::parseObject() for more.
    *
    * @param source    The string to be parsed into an object.
    * @param result    Formattable to be set to the parse result.
    *                  If parse fails, return contents are undefined.
    * @param parse_pos The position to start parsing at. Upon return
    *                  this param is set to the position after the
    *                  last character successfully parsed. If the
    *                  source is not parsed successfully, this param
    *                  will remain unchanged.
    * @stable ICU 4.0
    */
   virtual void parseObject(const UnicodeString&amp; source,
                            Formattable&amp; result,
                            ParsePosition&amp; parse_pos) const;

    /**
     * ICU &quot;poor man's RTTI&quot;, returns a UClassID for this class.
     *
     * @stable ICU 4.0
     *
     */
    static UClassID U_EXPORT2 getStaticClassID(void);

    /**
     * ICU &quot;poor man's RTTI&quot;, returns a UClassID for the actual class.
     *
     * @stable ICU 4.0
     */
     virtual UClassID getDynamicClassID() const;

private:
     /**
      * @internal
      */
    class U_I18N_API PluralSelector : public UMemory {
      public:
        virtual ~PluralSelector();
        /**
         * Given a number, returns the appropriate PluralFormat keyword.
         *
         * @param context worker object for the selector.
         * @param number The number to be plural-formatted.
         * @param ec Error code.
         * @return The selected PluralFormat keyword.
         * @internal
         */
        virtual UnicodeString select(void *context, double number, UErrorCode&amp; ec) const = 0;
    };

    /**
     * @internal
     */
    class U_I18N_API PluralSelectorAdapter : public PluralSelector {
      public:
        PluralSelectorAdapter() : pluralRules(NULL) {
        }

        virtual ~PluralSelectorAdapter();

        virtual UnicodeString select(void *context, double number, UErrorCode&amp; /*ec*/) const; /**&lt; @internal */

        void reset();

        PluralRules* pluralRules;
    };

    Locale  locale;
    MessagePattern msgPattern;
    NumberFormat*  numberFormat;
    double offset;
    PluralSelectorAdapter pluralRulesWrapper;

    PluralFormat();   // default constructor not implemented
    void init(const PluralRules* rules, UPluralType type, UErrorCode&amp; status);
    /**
     * Copies dynamically allocated values (pointer fields).
     * Others are copied using their copy constructors and assignment operators.
     */
    void copyObjects(const PluralFormat&amp; other);

    UnicodeString&amp; format(const Formattable&amp; numberObject, double number,
                          UnicodeString&amp; appendTo,
                          FieldPosition&amp; pos,
                          UErrorCode&amp; status) const; /**&lt; @internal */

    /**
     * Finds the PluralFormat sub-message for the given number, or the &quot;other&quot; sub-message.
     * @param pattern A MessagePattern.
     * @param partIndex the index of the first PluralFormat argument style part.
     * @param selector the PluralSelector for mapping the number (minus offset) to a keyword.
     * @param context worker object for the selector.
     * @param number a number to be matched to one of the PluralFormat argument's explicit values,
     *        or mapped via the PluralSelector.
     * @param ec ICU error code.
     * @return the sub-message start part index.
     */
    static int32_t findSubMessage(
         const MessagePattern&amp; pattern, int32_t partIndex,
         const PluralSelector&amp; selector, void *context, double number, UErrorCode&amp; ec); /**&lt; @internal */

    void parseType(const UnicodeString&amp; source, const NFRule *rbnfLenientScanner,
        Formattable&amp; result, FieldPosition&amp; pos) const;

    friend class MessageFormat;
    friend class NFRule;
};

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif // _PLURFMT
//eof
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