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Diffstat (limited to 'intl/icu/source/i18n/unicode/unumsys.h')
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diff --git a/intl/icu/source/i18n/unicode/unumsys.h b/intl/icu/source/i18n/unicode/unumsys.h new file mode 100644 index 0000000000..1631c234fd --- /dev/null +++ b/intl/icu/source/i18n/unicode/unumsys.h @@ -0,0 +1,173 @@ +// © 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" +#include "unicode/localpointer.h" + +/** + * \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_STABLE 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_STABLE 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_STABLE 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_STABLE 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_STABLE 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_STABLE 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_STABLE 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_STABLE int32_t U_EXPORT2 +unumsys_getDescription(const UNumberingSystem *unumsys, UChar *result, + int32_t resultLength, UErrorCode *status); + +#endif /* #if !UCONFIG_NO_FORMATTING */ + +#endif |