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