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// License & terms of use: http://www.unicode.org/copyright.html
/*
*****************************************************************************************
* Copyright (C) 2010-2013, International Business Machines
* Corporation and others. All Rights Reserved.
*****************************************************************************************
*/
#ifndef UPLURALRULES_H
#define UPLURALRULES_H
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
#include "unicode/localpointer.h"
/**
* \file
* \brief C API: Plural rules, select plural keywords for numeric values.
*
* A UPluralRules object 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 uplrules_select function examines each condition in order and
* returns the keyword for the first condition that matches the number.
* If none match, the default rule(other) is returned.
*
* For more information, see the LDML spec, C.11 Language Plural Rules:
* http://www.unicode.org/reports/tr35/#Language_Plural_Rules
*
* Keywords: ICU locale data has 6 predefined values -
* 'zero', 'one', 'two', 'few', 'many' and 'other'. Callers need to check
* the value of keyword returned by the uplrules_select function.
*
* These are based on CLDR <i>Language Plural Rules</i>. For these
* predefined rules, see the CLDR page at
* http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
*/
/**
* Type of plurals and PluralRules.
* @stable ICU 50
*/
enum UPluralType {
/**
* Plural rules for cardinal numbers: 1 file vs. 2 files.
* @stable ICU 50
*/
UPLURAL_TYPE_CARDINAL,
/**
* Plural rules for ordinal numbers: 1st file, 2nd file, 3rd file, 4th file, etc.
* @stable ICU 50
*/
UPLURAL_TYPE_ORDINAL,
#ifndef U_HIDE_DEPRECATED_API
/**
* One more than the highest normal UPluralType value.
* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
*/
UPLURAL_TYPE_COUNT
#endif // U_HIDE_DEPRECATED_API
};
/**
* @stable ICU 50
*/
typedef enum UPluralType UPluralType;
/**
* Opaque UPluralRules object for use in C programs.
* @stable ICU 4.8
*/
struct UPluralRules;
typedef struct UPluralRules UPluralRules; /**< C typedef for struct UPluralRules. @stable ICU 4.8 */
/**
* Opens a new UPluralRules object using the predefined cardinal-number plural rules for a
* given locale.
* Same as uplrules_openForType(locale, UPLURAL_TYPE_CARDINAL, status).
* @param locale The locale for which the rules are desired.
* @param status A pointer to a UErrorCode to receive any errors.
* @return A UPluralRules for the specified locale, or NULL if an error occurred.
* @stable ICU 4.8
*/
U_STABLE UPluralRules* U_EXPORT2
uplrules_open(const char *locale, UErrorCode *status);
/**
* Opens a new UPluralRules object using the predefined plural rules for a
* given locale and the plural type.
* @param locale The locale for which the rules are desired.
* @param type The plural type (e.g., cardinal or ordinal).
* @param status A pointer to a UErrorCode to receive any errors.
* @return A UPluralRules for the specified locale, or NULL if an error occurred.
* @stable ICU 50
*/
U_DRAFT UPluralRules* U_EXPORT2
uplrules_openForType(const char *locale, UPluralType type, UErrorCode *status);
/**
* Closes a UPluralRules object. Once closed it may no longer be used.
* @param uplrules The UPluralRules object to close.
* @stable ICU 4.8
*/
U_STABLE void U_EXPORT2
uplrules_close(UPluralRules *uplrules);
#if U_SHOW_CPLUSPLUS_API
U_NAMESPACE_BEGIN
/**
* \class LocalUPluralRulesPointer
* "Smart pointer" class, closes a UPluralRules via uplrules_close().
* For most methods see the LocalPointerBase base class.
*
* @see LocalPointerBase
* @see LocalPointer
* @stable ICU 4.8
*/
U_DEFINE_LOCAL_OPEN_POINTER(LocalUPluralRulesPointer, UPluralRules, uplrules_close);
U_NAMESPACE_END
#endif
/**
* Given a number, returns the keyword of the first rule that
* applies to the number, according to the supplied UPluralRules object.
* @param uplrules The UPluralRules object specifying the rules.
* @param number The number for which the rule has to be determined.
* @param keyword The keyword of the rule that applies to number.
* @param capacity The capacity of keyword.
* @param status A pointer to a UErrorCode to receive any errors.
* @return The length of keyword.
* @stable ICU 4.8
*/
U_STABLE int32_t U_EXPORT2
uplrules_select(const UPluralRules *uplrules,
double number,
UChar *keyword, int32_t capacity,
UErrorCode *status);
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif
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