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unumsys.h
// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ***************************************************************************************** * Copyright (C) 2013-2014, International Business Machines * Corporation and others. All Rights Reserved. ***************************************************************************************** */ #ifndef UNUMSYS_H #define UNUMSYS_H #include "unicode/utypes.h" #if !UCONFIG_NO_FORMATTING #include "unicode/uenum.h" #if U_SHOW_CPLUSPLUS_API #include "unicode/localpointer.h" #endif // U_SHOW_CPLUSPLUS_API /** * \file * \brief C API: UNumberingSystem, information about numbering systems * * Defines numbering systems. A numbering system describes the scheme by which * numbers are to be presented to the end user. In its simplest form, a numbering * system describes the set of digit characters that are to be used to display * numbers, such as Western digits, Thai digits, Arabic-Indic digits, etc., in a * positional numbering system with a specified radix (typically 10). * More complicated numbering systems are algorithmic in nature, and require use * of an RBNF formatter (rule based number formatter), in order to calculate * the characters to be displayed for a given number. Examples of algorithmic * numbering systems include Roman numerals, Chinese numerals, and Hebrew numerals. * Formatting rules for many commonly used numbering systems are included in * the ICU package, based on the numbering system rules defined in CLDR. * Alternate numbering systems can be specified to a locale by using the * numbers locale keyword. */ /** * Opaque UNumberingSystem object for use in C programs. * @stable ICU 52 */ struct UNumberingSystem; typedef struct UNumberingSystem UNumberingSystem; /**< C typedef for struct UNumberingSystem. @stable ICU 52 */ /** * Opens a UNumberingSystem object using the default numbering system for the specified * locale. * @param locale The locale for which the default numbering system should be opened. * @param status A pointer to a UErrorCode to receive any errors. For example, this * may be U_UNSUPPORTED_ERROR for a locale such as "en@numbers=xyz" that * specifies a numbering system unknown to ICU. * @return A UNumberingSystem for the specified locale, or NULL if an error * occurred. * @stable ICU 52 */ U_CAPI UNumberingSystem * U_EXPORT2 unumsys_open(const char *locale, UErrorCode *status); /** * Opens a UNumberingSystem object using the name of one of the predefined numbering * systems specified by CLDR and known to ICU, such as "latn", "arabext", or "hanidec"; * the full list is returned by unumsys_openAvailableNames. Note that some of the names * listed at http://unicode.org/repos/cldr/tags/latest/common/bcp47/number.xml - e.g. * default, native, traditional, finance - do not identify specific numbering systems, * but rather key values that may only be used as part of a locale, which in turn * defines how they are mapped to a specific numbering system such as "latn" or "hant". * * @param name The name of the numbering system for which a UNumberingSystem object * should be opened. * @param status A pointer to a UErrorCode to receive any errors. For example, this * may be U_UNSUPPORTED_ERROR for a numbering system such as "xyz" that * is unknown to ICU. * @return A UNumberingSystem for the specified name, or NULL if an error * occurred. * @stable ICU 52 */ U_CAPI UNumberingSystem * U_EXPORT2 unumsys_openByName(const char *name, UErrorCode *status); /** * Close a UNumberingSystem object. Once closed it may no longer be used. * @param unumsys The UNumberingSystem object to close. * @stable ICU 52 */ U_CAPI void U_EXPORT2 unumsys_close(UNumberingSystem *unumsys); #if U_SHOW_CPLUSPLUS_API U_NAMESPACE_BEGIN /** * \class LocalUNumberingSystemPointer * "Smart pointer" class, closes a UNumberingSystem via unumsys_close(). * For most methods see the LocalPointerBase base class. * @see LocalPointerBase * @see LocalPointer * @stable ICU 52 */ U_DEFINE_LOCAL_OPEN_POINTER(LocalUNumberingSystemPointer, UNumberingSystem, unumsys_close); U_NAMESPACE_END #endif /** * Returns an enumeration over the names of all of the predefined numbering systems known * to ICU. * The numbering system names will be in alphabetical (invariant) order. * @param status A pointer to a UErrorCode to receive any errors. * @return A pointer to a UEnumeration that must be closed with uenum_close(), * or NULL if an error occurred. * @stable ICU 52 */ U_CAPI UEnumeration * U_EXPORT2 unumsys_openAvailableNames(UErrorCode *status); /** * Returns the name of the specified UNumberingSystem object (if it is one of the * predefined names known to ICU). * @param unumsys The UNumberingSystem whose name is desired. * @return A pointer to the name of the specified UNumberingSystem object, or * NULL if the name is not one of the ICU predefined names. The pointer * is only valid for the lifetime of the UNumberingSystem object. * @stable ICU 52 */ U_CAPI const char * U_EXPORT2 unumsys_getName(const UNumberingSystem *unumsys); /** * Returns whether the given UNumberingSystem object is for an algorithmic (not purely * positional) system. * @param unumsys The UNumberingSystem whose algorithmic status is desired. * @return true if the specified UNumberingSystem object is for an algorithmic * system. * @stable ICU 52 */ U_CAPI UBool U_EXPORT2 unumsys_isAlgorithmic(const UNumberingSystem *unumsys); /** * Returns the radix of the specified UNumberingSystem object. Simple positional * numbering systems typically have radix 10, but might have a radix of e.g. 16 for * hexadecimal. The radix is less well-defined for non-positional algorithmic systems. * @param unumsys The UNumberingSystem whose radix is desired. * @return The radix of the specified UNumberingSystem object. * @stable ICU 52 */ U_CAPI int32_t U_EXPORT2 unumsys_getRadix(const UNumberingSystem *unumsys); /** * Get the description string of the specified UNumberingSystem object. For simple * positional systems this is the ordered string of digits (with length matching * the radix), e.g. "\u3007\u4E00\u4E8C\u4E09\u56DB\u4E94\u516D\u4E03\u516B\u4E5D" * for "hanidec"; it would be "0123456789ABCDEF" for hexadecimal. For * algorithmic systems this is the name of the RBNF ruleset used for formatting, * e.g. "zh/SpelloutRules/%spellout-cardinal" for "hans" or "%greek-upper" for * "grek". * @param unumsys The UNumberingSystem whose description string is desired. * @param result A pointer to a buffer to receive the description string. * @param resultLength The maximum size of result. * @param status A pointer to a UErrorCode to receive any errors. * @return The total buffer size needed; if greater than resultLength, the * output was truncated. * @stable ICU 52 */ U_CAPI int32_t U_EXPORT2 unumsys_getDescription(const UNumberingSystem *unumsys, UChar *result, int32_t resultLength, UErrorCode *status); #endif /* #if !UCONFIG_NO_FORMATTING */ #endif
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