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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
* Copyright (C) 2010-2014, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*
*
* File NUMSYS.H
*
* Modification History:*
* Date Name Description
*
********************************************************************************
*/
#ifndef NUMSYS
#define NUMSYS
#include "unicode/utypes.h"
#if U_SHOW_CPLUSPLUS_API
/**
* \file
* \brief C++ API: NumberingSystem object
*/
#if !UCONFIG_NO_FORMATTING
#include "unicode/format.h"
#include "unicode/uobject.h"
U_NAMESPACE_BEGIN
// can't be #ifndef U_HIDE_INTERNAL_API; needed for char[] field size
/**
* Size of a numbering system name.
* @internal
*/
constexpr const size_t kInternalNumSysNameCapacity = 8;
/**
* 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.
*/
class U_I18N_API NumberingSystem : public UObject {
public:
/**
* Default Constructor.
*
* @stable ICU 4.2
*/
NumberingSystem();
/**
* Copy constructor.
* @stable ICU 4.2
*/
NumberingSystem(const NumberingSystem& other);
/**
* Copy assignment.
* @stable ICU 4.2
*/
NumberingSystem& operator=(const NumberingSystem& other) = default;
/**
* Destructor.
* @stable ICU 4.2
*/
virtual ~NumberingSystem();
/**
* Create the default numbering system associated with the specified locale.
* @param inLocale The given locale.
* @param status ICU status
* @stable ICU 4.2
*/
static NumberingSystem* U_EXPORT2 createInstance(const Locale & inLocale, UErrorCode& status);
/**
* Create the default numbering system associated with the default locale.
* @stable ICU 4.2
*/
static NumberingSystem* U_EXPORT2 createInstance(UErrorCode& status);
/**
* Create a numbering system using the specified radix, type, and description.
* @param radix The radix (base) for this numbering system.
* @param isAlgorithmic true if the numbering system is algorithmic rather than numeric.
* @param description The string representing the set of digits used in a numeric system, or the name of the RBNF
* ruleset to be used in an algorithmic system.
* @param status ICU status
* @stable ICU 4.2
*/
static NumberingSystem* U_EXPORT2 createInstance(int32_t radix, UBool isAlgorithmic, const UnicodeString& description, UErrorCode& status );
/**
* Return a StringEnumeration over all the names of numbering systems known to ICU.
* The numbering system names will be in alphabetical (invariant) order.
*
* The returned StringEnumeration is owned by the caller, who must delete it when
* finished with it.
*
* @stable ICU 4.2
*/
static StringEnumeration * U_EXPORT2 getAvailableNames(UErrorCode& status);
/**
* Create a numbering system from 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.
* @param status ICU status; set to U_UNSUPPORTED_ERROR if numbering system not found.
* @return The NumberingSystem instance, or nullptr if not found.
* @stable ICU 4.2
*/
static NumberingSystem* U_EXPORT2 createInstanceByName(const char* name, UErrorCode& status);
/**
* Returns the radix of this numbering system. 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.
* @stable ICU 4.2
*/
int32_t getRadix() const;
/**
* Returns the name of this numbering system if it was created using one of the predefined names
* known to ICU. Otherwise, returns nullptr.
* The predefined names are identical to the numbering system names as defined by
* the BCP47 definition in Unicode CLDR.
* See also, http://www.unicode.org/repos/cldr/tags/latest/common/bcp47/number.xml
* @stable ICU 4.6
*/
const char * getName() const;
/**
* Returns the description string of this numbering system. 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".
* @stable ICU 4.2
*/
virtual UnicodeString getDescription() const;
/**
* Returns true if the given numbering system is algorithmic
*
* @return true if the numbering system is algorithmic.
* Otherwise, return false.
* @stable ICU 4.2
*/
UBool isAlgorithmic() const;
/**
* ICU "poor man's RTTI", returns a UClassID for this class.
*
* @stable ICU 4.2
*
*/
static UClassID U_EXPORT2 getStaticClassID();
/**
* ICU "poor man's RTTI", returns a UClassID for the actual class.
*
* @stable ICU 4.2
*/
virtual UClassID getDynamicClassID() const override;
private:
UnicodeString desc;
int32_t radix;
UBool algorithmic;
char name[kInternalNumSysNameCapacity+1];
void setRadix(int32_t radix);
void setAlgorithmic(UBool algorithmic);
void setDesc(const UnicodeString &desc);
void setName(const char* name);
};
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_FORMATTING */
#endif /* U_SHOW_CPLUSPLUS_API */
#endif // _NUMSYS
//eof
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