| /* |
| ******************************************************************************* |
| * Copyright (C) 2008-2009, 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" |
| |
| U_NAMESPACE_BEGIN |
| |
| class Hashtable; |
| class RuleChain; |
| class RuleParser; |
| |
| /** |
| * Defines rules for mapping positive long 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. |
| * |
| * 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 |
| * within_relation = expr ('not')? 'within' range |
| * expr = 'n' ('mod' value)? |
| * value = digit+ |
| * digit = 0|1|2|3|4|5|6|7|8|9 |
| * range = value'..'value |
| * \endcode |
| * </pre></p> |
| * <p> |
| * The difference between 'in' and 'within' is that 'in' only includes |
| * integers in the specified range, while 'within' includes all values.</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> |
| */ |
| 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 <code>PluralRules</code> for a given |
| * locale. |
| * |
| * @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); |
| |
| /** |
| * 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; |
| |
| /** |
| * 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; |
| |
| /** |
| * 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. |
| * @internal 4.0 |
| * @stable ICU 4.0 |
| */ |
| UnicodeString getKeywordOther() const; |
| |
| /** |
| * 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: |
| Hashtable *fLocaleStringsHash; |
| UnicodeString mLocaleName; |
| RuleChain *mRules; |
| RuleParser *mParser; |
| |
| PluralRules(); // default constructor not implemented |
| int32_t getRepeatLimit() const; |
| void parseDescription(UnicodeString& ruleData, RuleChain& rules, UErrorCode &status); |
| void getNextLocale(const UnicodeString& localeData, int32_t* curIndex, UnicodeString& localeName); |
| void addRules(RuleChain& rules); |
| int32_t getNumberValue(const UnicodeString& token) const; |
| UnicodeString getRuleFromResource(const Locale& locale, UErrorCode& status); |
| |
| }; |
| |
| U_NAMESPACE_END |
| |
| #endif /* #if !UCONFIG_NO_FORMATTING */ |
| |
| #endif // _PLURRULE |
| //eof |
