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comparison: intl/icu/source/i18n/unicode/numsys.h

intl/icu/source/i18n/unicode/numsys.h

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1 /*
2 *******************************************************************************
3 * Copyright (C) 2010-2013, International Business Machines Corporation and
4 * others. All Rights Reserved.
5 *******************************************************************************
6 *
7 *
8 * File NUMSYS.H
9 *
10 * Modification History:*
11 * Date Name Description
12 *
13 ********************************************************************************
14 */
15
16 #ifndef NUMSYS
17 #define NUMSYS
18
19 #include "unicode/utypes.h"
20
21 /**
22 * \def NUMSYS_NAME_CAPACITY
23 * Size of a numbering system name.
24 * @internal
25 */
26 #define NUMSYS_NAME_CAPACITY 8
27
28
29 /**
30 * \file
31 * \brief C++ API: NumberingSystem object
32 */
33
34 #if !UCONFIG_NO_FORMATTING
35
36
37 #include "unicode/format.h"
38 #include "unicode/uobject.h"
39
40 U_NAMESPACE_BEGIN
41
42 /**
43 * Defines numbering systems. A numbering system describes the scheme by which
44 * numbers are to be presented to the end user. In its simplest form, a numbering
45 * system describes the set of digit characters that are to be used to display
46 * numbers, such as Western digits, Thai digits, Arabic-Indic digits, etc., in a
47 * positional numbering system with a specified radix (typically 10).
48 * More complicated numbering systems are algorithmic in nature, and require use
49 * of an RBNF formatter ( rule based number formatter ), in order to calculate
50 * the characters to be displayed for a given number. Examples of algorithmic
51 * numbering systems include Roman numerals, Chinese numerals, and Hebrew numerals.
52 * Formatting rules for many commonly used numbering systems are included in
53 * the ICU package, based on the numbering system rules defined in CLDR.
54 * Alternate numbering systems can be specified to a locale by using the
55 * numbers locale keyword.
56 */
57
58 class U_I18N_API NumberingSystem : public UObject {
59 public:
60
61 /**
62 * Default Constructor.
63 *
64 * @stable ICU 4.2
65 */
66 NumberingSystem();
67
68 /**
69 * Copy constructor.
70 * @stable ICU 4.2
71 */
72 NumberingSystem(const NumberingSystem& other);
73
74 /**
75 * Destructor.
76 * @stable ICU 4.2
77 */
78 virtual ~NumberingSystem();
79
80 /**
81 * Create the default numbering system associated with the specified locale.
82 * @param inLocale The given locale.
83 * @param status ICU status
84 * @stable ICU 4.2
85 */
86 static NumberingSystem* U_EXPORT2 createInstance(const Locale & inLocale, UErrorCode& status);
87
88 /**
89 * Create the default numbering system associated with the default locale.
90 * @stable ICU 4.2
91 */
92 static NumberingSystem* U_EXPORT2 createInstance(UErrorCode& status);
93
94 /**
95 * Create a numbering system using the specified radix, type, and description.
96 * @param radix The radix (base) for this numbering system.
97 * @param isAlgorithmic TRUE if the numbering system is algorithmic rather than numeric.
98 * @param description The string representing the set of digits used in a numeric system, or the name of the RBNF
99 * ruleset to be used in an algorithmic system.
100 * @param status ICU status
101 * @stable ICU 4.2
102 */
103 static NumberingSystem* U_EXPORT2 createInstance(int32_t radix, UBool isAlgorithmic, const UnicodeString& description, UErrorCode& status );
104
105 /**
106 * Return a StringEnumeration over all the names of numbering systems known to ICU.
107 * @stable ICU 4.2
108 */
109
110 static StringEnumeration * U_EXPORT2 getAvailableNames(UErrorCode& status);
111
112 /**
113 * Create a numbering system from one of the predefined numbering systems specified
114 * by CLDR and known to ICU, such as "latn", "arabext", or "hanidec"; the full list
115 * is returned by unumsys_openAvailableNames. Note that some of the names listed at
116 * http://unicode.org/repos/cldr/tags/latest/common/bcp47/number.xml - e.g.
117 * default, native, traditional, finance - do not identify specific numbering systems,
118 * but rather key values that may only be used as part of a locale, which in turn
119 * defines how they are mapped to a specific numbering system such as "latn" or "hant".
120 * @param name The name of the numbering system.
121 * @param status ICU status
122 * @stable ICU 4.2
123 */
124 static NumberingSystem* U_EXPORT2 createInstanceByName(const char* name, UErrorCode& status);
125
126
127 /**
128 * Returns the radix of this numbering system. Simple positional numbering systems
129 * typically have radix 10, but might have a radix of e.g. 16 for hexadecimal. The
130 * radix is less well-defined for non-positional algorithmic systems.
131 * @stable ICU 4.2
132 */
133 int32_t getRadix() const;
134
135 /**
136 * Returns the name of this numbering system if it was created using one of the predefined names
137 * known to ICU. Otherwise, returns NULL.
138 * @stable ICU 4.6
139 */
140 const char * getName() const;
141
142 /**
143 * Returns the description string of this numbering system. For simple
144 * positional systems this is the ordered string of digits (with length matching
145 * the radix), e.g. "\u3007\u4E00\u4E8C\u4E09\u56DB\u4E94\u516D\u4E03\u516B\u4E5D"
146 * for "hanidec"; it would be "0123456789ABCDEF" for hexadecimal. For
147 * algorithmic systems this is the name of the RBNF ruleset used for formatting,
148 * e.g. "zh/SpelloutRules/%spellout-cardinal" for "hans" or "%greek-upper" for
149 * "grek".
150 * @stable ICU 4.2
151 */
152 virtual UnicodeString getDescription() const;
153
154
155
156 /**
157 * Returns TRUE if the given numbering system is algorithmic
158 *
159 * @return TRUE if the numbering system is algorithmic.
160 * Otherwise, return FALSE.
161 * @stable ICU 4.2
162 */
163 UBool isAlgorithmic() const;
164
165 /**
166 * ICU "poor man's RTTI", returns a UClassID for this class.
167 *
168 * @stable ICU 4.2
169 *
170 */
171 static UClassID U_EXPORT2 getStaticClassID(void);
172
173 /**
174 * ICU "poor man's RTTI", returns a UClassID for the actual class.
175 *
176 * @stable ICU 4.2
177 */
178 virtual UClassID getDynamicClassID() const;
179
180
181 private:
182 UnicodeString desc;
183 int32_t radix;
184 UBool algorithmic;
185 char name[NUMSYS_NAME_CAPACITY+1];
186
187 void setRadix(int32_t radix);
188
189 void setAlgorithmic(UBool algorithmic);
190
191 void setDesc(UnicodeString desc);
192
193 void setName(const char* name);
194
195 static UBool isValidDigitString(const UnicodeString &str);
196
197 UBool hasContiguousDecimalDigits() const;
198 };
199
200 U_NAMESPACE_END
201
202 #endif /* #if !UCONFIG_NO_FORMATTING */
203
204 #endif // _NUMSYS
205 //eof

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