502 lines
17 KiB
C++
502 lines
17 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 2008-2014, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*
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*
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* File PLURRULE.H
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*
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* Modification History:*
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* Date Name Description
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*
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********************************************************************************
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*/
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#ifndef PLURRULE
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#define PLURRULE
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C++ API: PluralRules object
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*/
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#if !UCONFIG_NO_FORMATTING
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#include "unicode/format.h"
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#include "unicode/upluralrules.h"
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/**
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* Value returned by PluralRules::getUniqueKeywordValue() when there is no
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* unique value to return.
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* @stable ICU 4.8
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*/
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#define UPLRULES_NO_UNIQUE_VALUE ((double)-0.00123456777)
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U_NAMESPACE_BEGIN
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class Hashtable;
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class FixedDecimal;
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class RuleChain;
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class PluralRuleParser;
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class PluralKeywordEnumeration;
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class AndConstraint;
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class SharedPluralRules;
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/**
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* Defines rules for mapping non-negative numeric values onto a small set of
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* keywords. Rules are constructed from a text description, consisting
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* of a series of keywords and conditions. The {@link #select} method
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* examines each condition in order and returns the keyword for the
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* first condition that matches the number. If none match,
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* default rule(other) is returned.
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*
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* For more information, details, and tips for writing rules, see the
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* LDML spec, C.11 Language Plural Rules:
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* http://www.unicode.org/draft/reports/tr35/tr35.html#Language_Plural_Rules
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*
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* Examples:<pre>
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* "one: n is 1; few: n in 2..4"</pre>
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* This defines two rules, for 'one' and 'few'. The condition for
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* 'one' is "n is 1" which means that the number must be equal to
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* 1 for this condition to pass. The condition for 'few' is
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* "n in 2..4" which means that the number must be between 2 and
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* 4 inclusive for this condition to pass. All other numbers
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* are assigned the keyword "other" by the default rule.
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* </p><pre>
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* "zero: n is 0; one: n is 1; zero: n mod 100 in 1..19"</pre>
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* This illustrates that the same keyword can be defined multiple times.
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* Each rule is examined in order, and the first keyword whose condition
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* passes is the one returned. Also notes that a modulus is applied
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* to n in the last rule. Thus its condition holds for 119, 219, 319...
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* </p><pre>
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* "one: n is 1; few: n mod 10 in 2..4 and n mod 100 not in 12..14"</pre>
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* This illustrates conjunction and negation. The condition for 'few'
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* has two parts, both of which must be met: "n mod 10 in 2..4" and
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* "n mod 100 not in 12..14". The first part applies a modulus to n
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* before the test as in the previous example. The second part applies
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* a different modulus and also uses negation, thus it matches all
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* numbers _not_ in 12, 13, 14, 112, 113, 114, 212, 213, 214...
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* </p>
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* <p>
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* Syntax:<pre>
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* \code
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* rules = rule (';' rule)*
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* rule = keyword ':' condition
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* keyword = <identifier>
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* condition = and_condition ('or' and_condition)*
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* and_condition = relation ('and' relation)*
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* relation = is_relation | in_relation | within_relation | 'n' <EOL>
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* is_relation = expr 'is' ('not')? value
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* in_relation = expr ('not')? 'in' range_list
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* within_relation = expr ('not')? 'within' range
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* expr = ('n' | 'i' | 'f' | 'v' | 'j') ('mod' value)?
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* range_list = (range | value) (',' range_list)*
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* value = digit+ ('.' digit+)?
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* digit = 0|1|2|3|4|5|6|7|8|9
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* range = value'..'value
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* \endcode
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* </pre></p>
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* <p>
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* <p>
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* The i, f, and v values are defined as follows:
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* </p>
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* <ul>
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* <li>i to be the integer digits.</li>
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* <li>f to be the visible fractional digits, as an integer.</li>
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* <li>v to be the number of visible fraction digits.</li>
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* <li>j is defined to only match integers. That is j is 3 fails if v != 0 (eg for 3.1 or 3.0).</li>
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* </ul>
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* <p>
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* Examples are in the following table:
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* </p>
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* <table border='1' style="border-collapse:collapse">
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* <tbody>
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* <tr>
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* <th>n</th>
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* <th>i</th>
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* <th>f</th>
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* <th>v</th>
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* </tr>
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* <tr>
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* <td>1.0</td>
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* <td>1</td>
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* <td align="right">0</td>
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* <td>1</td>
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* </tr>
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* <tr>
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* <td>1.00</td>
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* <td>1</td>
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* <td align="right">0</td>
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* <td>2</td>
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* </tr>
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* <tr>
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* <td>1.3</td>
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* <td>1</td>
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* <td align="right">3</td>
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* <td>1</td>
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* </tr>
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* <tr>
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* <td>1.03</td>
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* <td>1</td>
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* <td align="right">3</td>
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* <td>2</td>
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* </tr>
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* <tr>
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* <td>1.23</td>
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* <td>1</td>
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* <td align="right">23</td>
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* <td>2</td>
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* </tr>
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* </tbody>
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* </table>
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* <p>
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* The difference between 'in' and 'within' is that 'in' only includes integers in the specified range, while 'within'
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* includes all values. Using 'within' with a range_list consisting entirely of values is the same as using 'in' (it's
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* not an error).
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* </p>
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* An "identifier" is a sequence of characters that do not have the
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* Unicode Pattern_Syntax or Pattern_White_Space properties.
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* <p>
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* The difference between 'in' and 'within' is that 'in' only includes
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* integers in the specified range, while 'within' includes all values.
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* Using 'within' with a range_list consisting entirely of values is the
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* same as using 'in' (it's not an error).
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*</p>
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* <p>
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* Keywords
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* could be defined by users or from ICU locale data. There are 6
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* predefined values in ICU - 'zero', 'one', 'two', 'few', 'many' and
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* 'other'. Callers need to check the value of keyword returned by
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* {@link #select} method.
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* </p>
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*
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* Examples:<pre>
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* UnicodeString keyword = pl->select(number);
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* if (keyword== UnicodeString("one") {
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* ...
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* }
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* else if ( ... )
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* </pre>
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* <strong>Note:</strong><br>
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* <p>
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* ICU defines plural rules for many locales based on CLDR <i>Language Plural Rules</i>.
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* For these predefined rules, see CLDR page at
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* http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
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* </p>
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*/
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class U_I18N_API PluralRules : public UObject {
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public:
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/**
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* Constructor.
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* @param status Output param set to success/failure code on exit, which
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* must not indicate a failure before the function call.
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*
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* @stable ICU 4.0
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*/
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PluralRules(UErrorCode& status);
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/**
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* Copy constructor.
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* @stable ICU 4.0
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*/
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PluralRules(const PluralRules& other);
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/**
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* Destructor.
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* @stable ICU 4.0
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*/
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virtual ~PluralRules();
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/**
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* Clone
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* @stable ICU 4.0
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*/
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PluralRules* clone() const;
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/**
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* Assignment operator.
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* @stable ICU 4.0
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*/
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PluralRules& operator=(const PluralRules&);
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/**
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* Creates a PluralRules from a description if it is parsable, otherwise
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* returns NULL.
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*
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* @param description rule description
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* @param status Output param set to success/failure code on exit, which
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* must not indicate a failure before the function call.
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* @return new PluralRules pointer. NULL if there is an error.
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* @stable ICU 4.0
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*/
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static PluralRules* U_EXPORT2 createRules(const UnicodeString& description,
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UErrorCode& status);
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/**
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* The default rules that accept any number.
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*
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* @param status Output param set to success/failure code on exit, which
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* must not indicate a failure before the function call.
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* @return new PluralRules pointer. NULL if there is an error.
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* @stable ICU 4.0
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*/
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static PluralRules* U_EXPORT2 createDefaultRules(UErrorCode& status);
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/**
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* Provides access to the predefined cardinal-number <code>PluralRules</code> for a given
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* locale.
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* Same as forLocale(locale, UPLURAL_TYPE_CARDINAL, status).
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*
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* @param locale The locale for which a <code>PluralRules</code> object is
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* returned.
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* @param status Output param set to success/failure code on exit, which
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* must not indicate a failure before the function call.
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* @return The predefined <code>PluralRules</code> object pointer for
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* this locale. If there's no predefined rules for this locale,
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* the rules for the closest parent in the locale hierarchy
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* that has one will be returned. The final fallback always
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* returns the default 'other' rules.
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* @stable ICU 4.0
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*/
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static PluralRules* U_EXPORT2 forLocale(const Locale& locale, UErrorCode& status);
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/**
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* Provides access to the predefined <code>PluralRules</code> for a given
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* locale and the plural type.
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*
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* @param locale The locale for which a <code>PluralRules</code> object is
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* returned.
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* @param type The plural type (e.g., cardinal or ordinal).
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* @param status Output param set to success/failure code on exit, which
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* must not indicate a failure before the function call.
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* @return The predefined <code>PluralRules</code> object pointer for
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* this locale. If there's no predefined rules for this locale,
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* the rules for the closest parent in the locale hierarchy
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* that has one will be returned. The final fallback always
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* returns the default 'other' rules.
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* @stable ICU 50
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*/
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static PluralRules* U_EXPORT2 forLocale(const Locale& locale, UPluralType type, UErrorCode& status);
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#ifndef U_HIDE_INTERNAL_API
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/**
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* Return a StringEnumeration over the locales for which there is plurals data.
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* @return a StringEnumeration over the locales available.
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* @internal
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*/
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static StringEnumeration* U_EXPORT2 getAvailableLocales(UErrorCode &status);
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/**
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* Returns whether or not there are overrides.
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* @param locale the locale to check.
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* @return
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* @internal
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*/
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static UBool hasOverride(const Locale &locale);
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/**
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* For ICU use only.
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* creates a SharedPluralRules object
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* @internal
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*/
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static PluralRules* U_EXPORT2 internalForLocale(const Locale& locale, UPluralType type, UErrorCode& status);
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/**
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* For ICU use only.
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* Returns handle to the shared, cached PluralRules instance.
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* Caller must call removeRef() on returned value once it is done with
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* the shared instance.
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* @internal
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*/
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static const SharedPluralRules* U_EXPORT2 createSharedInstance(
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const Locale& locale, UPluralType type, UErrorCode& status);
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#endif /* U_HIDE_INTERNAL_API */
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/**
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* Given a number, returns the keyword of the first rule that applies to
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* the number. This function can be used with isKeyword* functions to
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* determine the keyword for default plural rules.
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*
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* @param number The number for which the rule has to be determined.
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* @return The keyword of the selected rule.
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* @stable ICU 4.0
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*/
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UnicodeString select(int32_t number) const;
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/**
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* Given a number, returns the keyword of the first rule that applies to
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* the number. This function can be used with isKeyword* functions to
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* determine the keyword for default plural rules.
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*
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* @param number The number for which the rule has to be determined.
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* @return The keyword of the selected rule.
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* @stable ICU 4.0
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*/
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UnicodeString select(double number) const;
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#ifndef U_HIDE_INTERNAL_API
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/**
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* @internal
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*/
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UnicodeString select(const FixedDecimal &number) const;
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#endif /* U_HIDE_INTERNAL_API */
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/**
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* Returns a list of all rule keywords used in this <code>PluralRules</code>
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* object. The rule 'other' is always present by default.
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*
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* @param status Output param set to success/failure code on exit, which
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* must not indicate a failure before the function call.
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* @return StringEnumeration with the keywords.
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* The caller must delete the object.
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* @stable ICU 4.0
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*/
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StringEnumeration* getKeywords(UErrorCode& status) const;
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/**
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* Returns a unique value for this keyword if it exists, else the constant
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* UPLRULES_NO_UNIQUE_VALUE.
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*
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* @param keyword The keyword.
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* @return The unique value that generates the keyword, or
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* UPLRULES_NO_UNIQUE_VALUE if the keyword is undefined or there is no
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* unique value that generates this keyword.
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* @stable ICU 4.8
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*/
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double getUniqueKeywordValue(const UnicodeString& keyword);
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/**
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* Returns all the values for which select() would return the keyword. If
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* the keyword is unknown, returns no values, but this is not an error. If
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* the number of values is unlimited, returns no values and -1 as the
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* count.
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*
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* The number of returned values is typically small.
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*
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* @param keyword The keyword.
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* @param dest Array into which to put the returned values. May
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* be NULL if destCapacity is 0.
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* @param destCapacity The capacity of the array, must be at least 0.
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* @param status The error code.
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* @return The count of values available, or -1. This count
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* can be larger than destCapacity, but no more than
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* destCapacity values will be written.
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* @stable ICU 4.8
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*/
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int32_t getAllKeywordValues(const UnicodeString &keyword,
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double *dest, int32_t destCapacity,
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UErrorCode& status);
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/**
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* Returns sample values for which select() would return the keyword. If
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* the keyword is unknown, returns no values, but this is not an error.
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*
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* The number of returned values is typically small.
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*
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* @param keyword The keyword.
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* @param dest Array into which to put the returned values. May
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* be NULL if destCapacity is 0.
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* @param destCapacity The capacity of the array, must be at least 0.
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* @param status The error code.
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* @return The count of values written.
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* If more than destCapacity samples are available, then
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* only destCapacity are written, and destCapacity is returned as the count,
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* rather than setting a U_BUFFER_OVERFLOW_ERROR.
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* (The actual number of keyword values could be unlimited.)
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* @stable ICU 4.8
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*/
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int32_t getSamples(const UnicodeString &keyword,
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double *dest, int32_t destCapacity,
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UErrorCode& status);
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/**
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* Returns TRUE if the given keyword is defined in this
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* <code>PluralRules</code> object.
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*
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* @param keyword the input keyword.
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* @return TRUE if the input keyword is defined.
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* Otherwise, return FALSE.
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* @stable ICU 4.0
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*/
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UBool isKeyword(const UnicodeString& keyword) const;
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/**
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* Returns keyword for default plural form.
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*
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* @return keyword for default plural form.
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* @stable ICU 4.0
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*/
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UnicodeString getKeywordOther() const;
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#ifndef U_HIDE_INTERNAL_API
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/**
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*
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* @internal
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*/
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UnicodeString getRules() const;
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#endif /* U_HIDE_INTERNAL_API */
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/**
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* Compares the equality of two PluralRules objects.
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*
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* @param other The other PluralRules object to be compared with.
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* @return True if the given PluralRules is the same as this
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* PluralRules; false otherwise.
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* @stable ICU 4.0
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*/
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virtual UBool operator==(const PluralRules& other) const;
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/**
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* Compares the inequality of two PluralRules objects.
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*
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* @param other The PluralRules object to be compared with.
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* @return True if the given PluralRules is not the same as this
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* PluralRules; false otherwise.
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* @stable ICU 4.0
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*/
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UBool operator!=(const PluralRules& other) const {return !operator==(other);}
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*
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* @stable ICU 4.0
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*
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*/
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static UClassID U_EXPORT2 getStaticClassID(void);
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*
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* @stable ICU 4.0
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*/
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virtual UClassID getDynamicClassID() const;
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private:
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RuleChain *mRules;
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PluralRules(); // default constructor not implemented
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void parseDescription(const UnicodeString& ruleData, UErrorCode &status);
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int32_t getNumberValue(const UnicodeString& token) const;
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UnicodeString getRuleFromResource(const Locale& locale, UPluralType type, UErrorCode& status);
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RuleChain *rulesForKeyword(const UnicodeString &keyword) const;
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friend class PluralRuleParser;
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_FORMATTING */
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#endif // _PLURRULE
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//eof
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