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// © 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
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