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-// © 2016 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-/*
-*******************************************************************************
-* Copyright (C) 2008-2015, International Business Machines Corporation and
-* others. All Rights Reserved.
-*******************************************************************************
-*
-*
-* File PLURRULE.H
-*
-* Modification History:*
-* Date Name Description
-*
-********************************************************************************
-*/
-
-#ifndef PLURRULE
-#define PLURRULE
-
-#include "unicode/utypes.h"
-
-/**
- * \file
- * \brief C++ API: PluralRules object
- */
-
-#if !UCONFIG_NO_FORMATTING
-
-#include "unicode/format.h"
-#include "unicode/upluralrules.h"
-#ifndef U_HIDE_INTERNAL_API
-#include "unicode/numfmt.h"
-#endif /* U_HIDE_INTERNAL_API */
-
-/**
- * Value returned by PluralRules::getUniqueKeywordValue() when there is no
- * unique value to return.
- * @stable ICU 4.8
- */
-#define UPLRULES_NO_UNIQUE_VALUE ((double)-0.00123456777)
-
-U_NAMESPACE_BEGIN
-
-class Hashtable;
-class IFixedDecimal;
-class RuleChain;
-class PluralRuleParser;
-class PluralKeywordEnumeration;
-class AndConstraint;
-class SharedPluralRules;
-
-/**
- * Defines rules for mapping non-negative numeric values onto a small set of
- * keywords. Rules are constructed from a text description, consisting
- * of a series of keywords and conditions. The {@link #select} method
- * examines each condition in order and returns the keyword for the
- * first condition that matches the number. If none match,
- * default rule(other) is returned.
- *
- * For more information, details, and tips for writing rules, see the
- * LDML spec, C.11 Language Plural Rules:
- * http://www.unicode.org/draft/reports/tr35/tr35.html#Language_Plural_Rules
- *
- * Examples:<pre>
- * "one: n is 1; few: n in 2..4"</pre>
- * This defines two rules, for 'one' and 'few'. The condition for
- * 'one' is "n is 1" which means that the number must be equal to
- * 1 for this condition to pass. The condition for 'few' is
- * "n in 2..4" which means that the number must be between 2 and
- * 4 inclusive for this condition to pass. All other numbers
- * are assigned the keyword "other" by the default rule.
- * </p><pre>
- * "zero: n is 0; one: n is 1; zero: n mod 100 in 1..19"</pre>
- * This illustrates that the same keyword can be defined multiple times.
- * Each rule is examined in order, and the first keyword whose condition
- * passes is the one returned. Also notes that a modulus is applied
- * to n in the last rule. Thus its condition holds for 119, 219, 319...
- * </p><pre>
- * "one: n is 1; few: n mod 10 in 2..4 and n mod 100 not in 12..14"</pre>
- * This illustrates conjunction and negation. The condition for 'few'
- * has two parts, both of which must be met: "n mod 10 in 2..4" and
- * "n mod 100 not in 12..14". The first part applies a modulus to n
- * before the test as in the previous example. The second part applies
- * a different modulus and also uses negation, thus it matches all
- * numbers _not_ in 12, 13, 14, 112, 113, 114, 212, 213, 214...
- * </p>
- * <p>
- * Syntax:<pre>
- * \code
- * rules = rule (';' rule)*
- * rule = keyword ':' condition
- * keyword = <identifier>
- * condition = and_condition ('or' and_condition)*
- * and_condition = relation ('and' relation)*
- * relation = is_relation | in_relation | within_relation | 'n' <EOL>
- * is_relation = expr 'is' ('not')? value
- * in_relation = expr ('not')? 'in' range_list
- * within_relation = expr ('not')? 'within' range
- * expr = ('n' | 'i' | 'f' | 'v' | 'j') ('mod' value)?
- * range_list = (range | value) (',' range_list)*
- * value = digit+ ('.' digit+)?
- * digit = 0|1|2|3|4|5|6|7|8|9
- * range = value'..'value
- * \endcode
- * </pre></p>
- * <p>
- * <p>
- * The i, f, and v values are defined as follows:
- * </p>
- * <ul>
- * <li>i to be the integer digits.</li>
- * <li>f to be the visible fractional digits, as an integer.</li>
- * <li>v to be the number of visible fraction digits.</li>
- * <li>j is defined to only match integers. That is j is 3 fails if v != 0 (eg for 3.1 or 3.0).</li>
- * </ul>
- * <p>
- * Examples are in the following table:
- * </p>
- * <table border='1' style="border-collapse:collapse">
- * <tr>
- * <th>n</th>
- * <th>i</th>
- * <th>f</th>
- * <th>v</th>
- * </tr>
- * <tr>
- * <td>1.0</td>
- * <td>1</td>
- * <td align="right">0</td>
- * <td>1</td>
- * </tr>
- * <tr>
- * <td>1.00</td>
- * <td>1</td>
- * <td align="right">0</td>
- * <td>2</td>
- * </tr>
- * <tr>
- * <td>1.3</td>
- * <td>1</td>
- * <td align="right">3</td>
- * <td>1</td>
- * </tr>
- * <tr>
- * <td>1.03</td>
- * <td>1</td>
- * <td align="right">3</td>
- * <td>2</td>
- * </tr>
- * <tr>
- * <td>1.23</td>
- * <td>1</td>
- * <td align="right">23</td>
- * <td>2</td>
- * </tr>
- * </table>
- * <p>
- * The difference between 'in' and 'within' is that 'in' only includes integers in the specified range, while 'within'
- * includes all values. Using 'within' with a range_list consisting entirely of values is the same as using 'in' (it's
- * not an error).
- * </p>
-
- * An "identifier" is a sequence of characters that do not have the
- * Unicode Pattern_Syntax or Pattern_White_Space properties.
- * <p>
- * The difference between 'in' and 'within' is that 'in' only includes
- * integers in the specified range, while 'within' includes all values.
- * Using 'within' with a range_list consisting entirely of values is the
- * same as using 'in' (it's not an error).
- *</p>
- * <p>
- * Keywords
- * could be defined by users or from ICU locale data. There are 6
- * predefined values in ICU - 'zero', 'one', 'two', 'few', 'many' and
- * 'other'. Callers need to check the value of keyword returned by
- * {@link #select} method.
- * </p>
- *
- * Examples:<pre>
- * UnicodeString keyword = pl->select(number);
- * if (keyword== UnicodeString("one") {
- * ...
- * }
- * else if ( ... )
- * </pre>
- * <strong>Note:</strong><br>
- * <p>
- * ICU defines plural rules for many locales based on CLDR <i>Language Plural Rules</i>.
- * For these predefined rules, see CLDR page at
- * http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
- * </p>
- */
-class U_I18N_API PluralRules : public UObject {
-public:
-
- /**
- * Constructor.
- * @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
- */
- PluralRules(UErrorCode& status);
-
- /**
- * Copy constructor.
- * @stable ICU 4.0
- */
- PluralRules(const PluralRules& other);
-
- /**
- * Destructor.
- * @stable ICU 4.0
- */
- virtual ~PluralRules();
-
- /**
- * Clone
- * @stable ICU 4.0
- */
- PluralRules* clone() const;
-
- /**
- * Assignment operator.
- * @stable ICU 4.0
- */
- PluralRules& operator=(const PluralRules&);
-
- /**
- * Creates a PluralRules from a description if it is parsable, otherwise
- * returns NULL.
- *
- * @param description rule description
- * @param status Output param set to success/failure code on exit, which
- * must not indicate a failure before the function call.
- * @return new PluralRules pointer. NULL if there is an error.
- * @stable ICU 4.0
- */
- static PluralRules* U_EXPORT2 createRules(const UnicodeString& description,
- UErrorCode& status);
-
- /**
- * The default rules that accept any number.
- *
- * @param status Output param set to success/failure code on exit, which
- * must not indicate a failure before the function call.
- * @return new PluralRules pointer. NULL if there is an error.
- * @stable ICU 4.0
- */
- static PluralRules* U_EXPORT2 createDefaultRules(UErrorCode& status);
-
- /**
- * Provides access to the predefined cardinal-number <code>PluralRules</code> for a given
- * locale.
- * Same as forLocale(locale, UPLURAL_TYPE_CARDINAL, status).
- *
- * @param locale The locale for which a <code>PluralRules</code> object is
- * returned.
- * @param status Output param set to success/failure code on exit, which
- * must not indicate a failure before the function call.
- * @return The predefined <code>PluralRules</code> object pointer for
- * this locale. If there's no predefined rules for this locale,
- * the rules for the closest parent in the locale hierarchy
- * that has one will be returned. The final fallback always
- * returns the default 'other' rules.
- * @stable ICU 4.0
- */
- static PluralRules* U_EXPORT2 forLocale(const Locale& locale, UErrorCode& status);
-
- /**
- * Provides access to the predefined <code>PluralRules</code> for a given
- * locale and the plural type.
- *
- * @param locale The locale for which a <code>PluralRules</code> object is
- * returned.
- * @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.
- * @return The predefined <code>PluralRules</code> object pointer for
- * this locale. If there's no predefined rules for this locale,
- * the rules for the closest parent in the locale hierarchy
- * that has one will be returned. The final fallback always
- * returns the default 'other' rules.
- * @stable ICU 50
- */
- static PluralRules* U_EXPORT2 forLocale(const Locale& locale, UPluralType type, UErrorCode& status);
-
-#ifndef U_HIDE_INTERNAL_API
- /**
- * Return a StringEnumeration over the locales for which there is plurals data.
- * @return a StringEnumeration over the locales available.
- * @internal
- */
- static StringEnumeration* U_EXPORT2 getAvailableLocales(UErrorCode &status);
-
- /**
- * Returns whether or not there are overrides.
- * @param locale the locale to check.
- * @return
- * @internal
- */
- static UBool hasOverride(const Locale &locale);
-
- /**
- * For ICU use only.
- * creates a SharedPluralRules object
- * @internal
- */
- static PluralRules* U_EXPORT2 internalForLocale(const Locale& locale, UPluralType type, UErrorCode& status);
-
- /**
- * For ICU use only.
- * Returns handle to the shared, cached PluralRules instance.
- * Caller must call removeRef() on returned value once it is done with
- * the shared instance.
- * @internal
- */
- static const SharedPluralRules* U_EXPORT2 createSharedInstance(
- const Locale& locale, UPluralType type, UErrorCode& status);
-
-
-#endif /* U_HIDE_INTERNAL_API */
-
- /**
- * Given a number, returns the keyword of the first rule that applies to
- * the number. This function can be used with isKeyword* functions to
- * determine the keyword for default plural rules.
- *
- * @param number The number for which the rule has to be determined.
- * @return The keyword of the selected rule.
- * @stable ICU 4.0
- */
- UnicodeString select(int32_t number) const;
-
- /**
- * Given a number, returns the keyword of the first rule that applies to
- * the number. This function can be used with isKeyword* functions to
- * determine the keyword for default plural rules.
- *
- * @param number The number for which the rule has to be determined.
- * @return The keyword of the selected rule.
- * @stable ICU 4.0
- */
- UnicodeString select(double number) const;
-
-#ifndef U_HIDE_INTERNAL_API
- /**
- * @internal
- */
- UnicodeString select(const IFixedDecimal &number) const;
-#endif /* U_HIDE_INTERNAL_API */
-
- /**
- * Returns a list of all rule keywords used in this <code>PluralRules</code>
- * object. The rule 'other' is always present by default.
- *
- * @param status Output param set to success/failure code on exit, which
- * must not indicate a failure before the function call.
- * @return StringEnumeration with the keywords.
- * The caller must delete the object.
- * @stable ICU 4.0
- */
- StringEnumeration* getKeywords(UErrorCode& status) const;
-
-#ifndef U_HIDE_DEPRECATED_API
- /**
- * Deprecated Function, does not return useful results.
- *
- * Originally intended to return a unique value for this keyword if it exists,
- * else the constant UPLRULES_NO_UNIQUE_VALUE.
- *
- * @param keyword The keyword.
- * @return Stub deprecated function returns UPLRULES_NO_UNIQUE_VALUE always.
- * @deprecated ICU 55
- */
- double getUniqueKeywordValue(const UnicodeString& keyword);
-
- /**
- * Deprecated Function, does not produce useful results.
- *
- * Originally intended to return all the values for which select() would return the keyword.
- * If the keyword is unknown, returns no values, but this is not an error. If
- * the number of values is unlimited, returns no values and -1 as the
- * count.
- *
- * The number of returned values is typically small.
- *
- * @param keyword The keyword.
- * @param dest Array into which to put the returned values. May
- * be NULL if destCapacity is 0.
- * @param destCapacity The capacity of the array, must be at least 0.
- * @param status The error code. Deprecated function, always sets U_UNSUPPORTED_ERROR.
- * @return The count of values available, or -1. This count
- * can be larger than destCapacity, but no more than
- * destCapacity values will be written.
- * @deprecated ICU 55
- */
- int32_t getAllKeywordValues(const UnicodeString &keyword,
- double *dest, int32_t destCapacity,
- UErrorCode& status);
-#endif /* U_HIDE_DEPRECATED_API */
-
- /**
- * Returns sample values for which select() would return the keyword. If
- * the keyword is unknown, returns no values, but this is not an error.
- *
- * The number of returned values is typically small.
- *
- * @param keyword The keyword.
- * @param dest Array into which to put the returned values. May
- * be NULL if destCapacity is 0.
- * @param destCapacity The capacity of the array, must be at least 0.
- * @param status The error code.
- * @return The count of values written.
- * If more than destCapacity samples are available, then
- * only destCapacity are written, and destCapacity is returned as the count,
- * rather than setting a U_BUFFER_OVERFLOW_ERROR.
- * (The actual number of keyword values could be unlimited.)
- * @stable ICU 4.8
- */
- int32_t getSamples(const UnicodeString &keyword,
- double *dest, int32_t destCapacity,
- UErrorCode& status);
-
- /**
- * Returns TRUE if the given keyword is defined in this
- * <code>PluralRules</code> object.
- *
- * @param keyword the input keyword.
- * @return TRUE if the input keyword is defined.
- * Otherwise, return FALSE.
- * @stable ICU 4.0
- */
- UBool isKeyword(const UnicodeString& keyword) const;
-
-
- /**
- * Returns keyword for default plural form.
- *
- * @return keyword for default plural form.
- * @stable ICU 4.0
- */
- UnicodeString getKeywordOther() const;
-
-#ifndef U_HIDE_INTERNAL_API
- /**
- *
- * @internal
- */
- UnicodeString getRules() const;
-#endif /* U_HIDE_INTERNAL_API */
-
- /**
- * Compares the equality of two PluralRules objects.
- *
- * @param other The other PluralRules object to be compared with.
- * @return True if the given PluralRules is the same as this
- * PluralRules; false otherwise.
- * @stable ICU 4.0
- */
- virtual UBool operator==(const PluralRules& other) const;
-
- /**
- * Compares the inequality of two PluralRules objects.
- *
- * @param other The PluralRules object to be compared with.
- * @return True if the given PluralRules is not the same as this
- * PluralRules; false otherwise.
- * @stable ICU 4.0
- */
- UBool operator!=(const PluralRules& other) const {return !operator==(other);}
-
-
- /**
- * ICU "poor man's RTTI", returns a UClassID for this class.
- *
- * @stable ICU 4.0
- *
- */
- static UClassID U_EXPORT2 getStaticClassID(void);
-
- /**
- * ICU "poor man's RTTI", returns a UClassID for the actual class.
- *
- * @stable ICU 4.0
- */
- virtual UClassID getDynamicClassID() const;
-
-
-private:
- RuleChain *mRules;
-
- PluralRules(); // default constructor not implemented
- void parseDescription(const UnicodeString& ruleData, UErrorCode &status);
- int32_t getNumberValue(const UnicodeString& token) const;
- UnicodeString getRuleFromResource(const Locale& locale, UPluralType type, UErrorCode& status);
- RuleChain *rulesForKeyword(const UnicodeString &keyword) const;
-
- /**
- * An internal status variable used to indicate that the object is in an 'invalid' state.
- * Used by copy constructor, the assignment operator and the clone method.
- */
- UErrorCode mInternalStatus;
-
- friend class PluralRuleParser;
-};
-
-U_NAMESPACE_END
-
-#endif /* #if !UCONFIG_NO_FORMATTING */
-
-#endif // _PLURRULE
-//eof