diff -r 000000000000 -r 6474c204b198 intl/icu/source/i18n/unicode/plurrule.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/intl/icu/source/i18n/unicode/plurrule.h Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,481 @@ +/* +******************************************************************************* +* Copyright (C) 2008-2013, 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" + +/** + * 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 FixedDecimal; +class RuleChain; +class PluralRuleParser; +class PluralKeywordEnumeration; +class AndConstraint; + +/** + * 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:
+ *   "one: n is 1; few: n in 2..4"
+ * 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. + * 

+ *    "zero: n is 0; one: n is 1; zero: n mod 100 in 1..19"
+ * 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... + * 

+ *    "one: n is 1; few: n mod 10 in 2..4 and n mod 100 not in 12..14"
+ * 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... + *

+ *

+ * Syntax:

+ * \code
+ * rules         = rule (';' rule)*
+ * rule          = keyword ':' condition
+ * keyword       = 
+ * condition     = and_condition ('or' and_condition)*
+ * and_condition = relation ('and' relation)*
+ * relation      = is_relation | in_relation | within_relation | 'n' 
+ * 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
+ *

+ *

+ *

+ * The i, f, and v values are defined as follows: + *

+ * + *

+ * Examples are in the following table: + *

+ * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + * + *
nifv
1.0101
1.00102
1.3131
1.03132
1.231232
+ *

+ * 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). + *

+ + * An "identifier" is a sequence of characters that do not have the + * Unicode Pattern_Syntax or Pattern_White_Space properties. + *

+ * 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). + *

+ *

+ * 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. + *

+ * + * Examples:
+ * UnicodeString keyword = pl->select(number);
+ * if (keyword== UnicodeString("one") {
+ *     ...
+ * }
+ * else if ( ... )
+ *
+ * Note:
+ *

+ * ICU defines plural rules for many locales based on CLDR Language Plural Rules. + * For these predefined rules, see CLDR page at + * http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html + *

+ */ +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 PluralRules for a given + * locale. + * Same as forLocale(locale, UPLURAL_TYPE_CARDINAL, status). + * + * @param locale The locale for which a PluralRules 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 PluralRules 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 PluralRules for a given + * locale and the plural type. + * + * @param locale The locale for which a PluralRules 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 PluralRules 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); +#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 FixedDecimal &number) const; +#endif /* U_HIDE_INTERNAL_API */ + + /** + * Returns a list of all rule keywords used in this PluralRules + * 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 a unique value for this keyword if it exists, else the constant + * UPLRULES_NO_UNIQUE_VALUE. + * + * @param keyword The keyword. + * @return The unique value that generates the keyword, or + * UPLRULES_NO_UNIQUE_VALUE if the keyword is undefined or there is no + * unique value that generates this keyword. + * @stable ICU 4.8 + */ + double getUniqueKeywordValue(const UnicodeString& keyword); + + /** + * Returns 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. + * @return The count of values available, or -1. This count + * can be larger than destCapacity, but no more than + * destCapacity values will be written. + * @stable ICU 4.8 + */ + int32_t getAllKeywordValues(const UnicodeString &keyword, + double *dest, int32_t destCapacity, + UErrorCode& status); + + /** + * 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 + * PluralRules 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; + + friend class PluralRuleParser; +}; + +U_NAMESPACE_END + +#endif /* #if !UCONFIG_NO_FORMATTING */ + +#endif // _PLURRULE +//eof