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Unified Diff: icu46/source/i18n/unicode/plurfmt.h

Issue 5516007: Check in the pristine copy of ICU 4.6... (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/
Patch Set: Created 10 years ago
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Index: icu46/source/i18n/unicode/plurfmt.h
===================================================================
--- icu46/source/i18n/unicode/plurfmt.h (revision 0)
+++ icu46/source/i18n/unicode/plurfmt.h (revision 0)
@@ -0,0 +1,549 @@
+/*
+*******************************************************************************
+* Copyright (C) 2007-2010, International Business Machines Corporation and
+* others. All Rights Reserved.
+*******************************************************************************
+*
+
+* File PLURFMT.H
+*
+* Modification History:*
+* Date Name Description
+*
+********************************************************************************
+*/
+
+#ifndef PLURFMT
+#define PLURFMT
+
+#include "unicode/utypes.h"
+
+/**
+ * \file
+ * \brief C++ API: PluralFormat object
+ */
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/numfmt.h"
+#include "unicode/plurrule.h"
+
+U_NAMESPACE_BEGIN
+
+class Hashtable;
+
+/**
+ * <p>
+ * <code>PluralFormat</code> supports the creation of internationalized
+ * messages with plural inflection. It is based on <i>plural
+ * selection</i>, i.e. the caller specifies messages for each
+ * plural case that can appear in the users language and the
+ * <code>PluralFormat</code> selects the appropriate message based on
+ * the number.
+ * </p>
+ * <h4>The Problem of Plural Forms in Internationalized Messages</h4>
+ * <p>
+ * Different languages have different ways to inflect
+ * plurals. Creating internationalized messages that include plural
+ * forms is only feasible when the framework is able to handle plural
+ * forms of <i>all</i> languages correctly. <code>ChoiceFormat</code>
+ * doesn't handle this well, because it attaches a number interval to
+ * each message and selects the message whose interval contains a
+ * given number. This can only handle a finite number of
+ * intervals. But in some languages, like Polish, one plural case
+ * applies to infinitely many intervals (e.g., paucal applies to
+ * numbers ending with 2, 3, or 4 except those ending with 12, 13, or
+ * 14). Thus <code>ChoiceFormat</code> is not adequate.
+ * </p><p>
+ * <code>PluralFormat</code> deals with this by breaking the problem
+ * into two parts:
+ * <ul>
+ * <li>It uses <code>PluralRules</code> that can define more complex
+ * conditions for a plural case than just a single interval. These plural
+ * rules define both what plural cases exist in a language, and to
+ * which numbers these cases apply.
+ * <li>It provides predefined plural rules for many locales. Thus, the programmer
+ * need not worry about the plural cases of a language. On the flip side,
+ * the localizer does not have to specify the plural cases; he can simply
+ * use the predefined keywords. The whole plural formatting of messages can
+ * be done using localized patterns from resource bundles. For predefined plural
+ * rules, see CLDR <i>Language Plural Rules</i> page at
+ * http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
+ * </ul>
+ * </p>
+ * <h4>Usage of <code>PluralFormat</code></h4>
+ * <p>
+ * This discussion assumes that you use <code>PluralFormat</code> with
+ * a predefined set of plural rules. You can create one using one of
+ * the constructors that takes a <code>locale</code> object. To
+ * specify the message pattern, you can either pass it to the
+ * constructor or set it explicitly using the
+ * <code>applyPattern()</code> method. The <code>format()</code>
+ * method takes a number object and selects the message of the
+ * matching plural case. This message will be returned.
+ * </p>
+ * <h5>Patterns and Their Interpretation</h5>
+ * <p>
+ * The pattern text defines the message output for each plural case of the
+ * used locale. The pattern is a sequence of
+ * <code><i>caseKeyword</i>{<i>message</i>}</code> clauses, separated by white
+ * space characters. Each clause assigns the message <code><i>message</i></code>
+ * to the plural case identified by <code><i>caseKeyword</i></code>.
+ * </p><p>
+ * There are 6 predefined casekeyword in ICU - 'zero', 'one', 'two', 'few', 'many' and
+ * 'other'. You always have to define a message text for the default plural case
+ * "<code>other</code>" which is contained in every rule set. If the plural
+ * rules of the <code>PluralFormat</code> object do not contain a plural case
+ * identified by <code><i>caseKeyword</i></code>, U_DEFAULT_KEYWORD_MISSING
+ * will be set to status.
+ * If you do not specify a message text for a particular plural case, the
+ * message text of the plural case "<code>other</code>" gets assigned to this
+ * plural case. If you specify more than one message for the same plural case,
+ * U_DUPLICATE_KEYWORD will be set to status.
+ * <br>
+ * Spaces between <code><i>caseKeyword</i></code> and
+ * <code><i>message</i></code> will be ignored; spaces within
+ * <code><i>message</i></code> will be preserved.
+ * </p><p>
+ * The message text for a particular plural case may contain other message
+ * format patterns. <code>PluralFormat</code> preserves these so that you
+ * can use the strings produced by <code>PluralFormat</code> with other
+ * formatters. If you are using <code>PluralFormat</code> inside a
+ * <code>MessageFormat</code> pattern, <code>MessageFormat</code> will
+ * automatically evaluate the resulting format pattern.<br>
+ * Thus, curly braces (<code>{</code>, <code>}</code>) are <i>only</i> allowed
+ * in message texts to define a nested format pattern.<br>
+ * The pound sign (<code>#</code>) will be interpreted as the number placeholder
+ * in the message text, if it is not contained in curly braces (to preserve
+ * <code>NumberFormat</code> patterns). <code>PluralFormat</code> will
+ * replace each of those pound signs by the number passed to the
+ * <code>format()</code> method. It will be formatted using a
+ * <code>NumberFormat</code> for the <code>PluralFormat</code>'s locale. If you
+ * need special number formatting, you have to explicitly specify a
+ * <code>NumberFormat</code> for the <code>PluralFormat</code> to use.
+ * </p>
+ * Example
+ * <pre>
+ * \code
+ * UErrorCode status = U_ZERO_ERROR;
+ * MessageFormat* msgFmt = new MessageFormat(UnicodeString("{0, plural,
+ * one{{0, number, C''est #,##0.0# fichier}} other {Ce sont # fichiers}} dans la liste."),
+ * Locale("fr"), status);
+ * if (U_FAILURE(status)) {
+ * return;
+ * }
+ * Formattable args1[] = {(int32_t)0};
+ * Formattable args2[] = {(int32_t)3};
+ * FieldPosition ignore(FieldPosition::DONT_CARE);
+ * UnicodeString result;
+ * msgFmt->format(args1, 1, result, ignore, status);
+ * cout << result << endl;
+ * result.remove();
+ * msgFmt->format(args2, 1, result, ignore, status);
+ * cout << result << endl;
+ * \endcode
+ * </pre>
+ * Produces the output:<br>
+ * <code>C'est 0,0 fichier dans la liste.</code><br>
+ * <code>Ce sont 3 fichiers dans la liste.</code>
+ * <p>
+ * <strong>Note:</strong><br>
+ * Currently <code>PluralFormat</code>
+ * does not make use of quotes like <code>MessageFormat</code>.
+ * If you use plural format strings with <code>MessageFormat</code> and want
+ * to use a quote sign <code>'</code>, you have to write <code>''</code>.
+ * <code>MessageFormat</code> unquotes this pattern and passes the unquoted
+ * pattern to <code>PluralFormat</code>. It's a bit trickier if you use
+ * nested formats that do quoting. In the example above, we wanted to insert
+ * <code>'</code> in the number format pattern. Since
+ * <code>NumberFormat</code> supports quotes, we had to insert
+ * <code>''</code>. But since <code>MessageFormat</code> unquotes the
+ * pattern before it gets passed to <code>PluralFormat</code>, we have to
+ * double these quotes, i.e. write <code>''''</code>.
+ * </p>
+ * <h4>Defining Custom Plural Rules</h4>
+ * <p>If you need to use <code>PluralFormat</code> with custom rules, you can
+ * create a <code>PluralRules</code> object and pass it to
+ * <code>PluralFormat</code>'s constructor. If you also specify a locale in this
+ * constructor, this locale will be used to format the number in the message
+ * texts.
+ * </p><p>
+ * For more information about <code>PluralRules</code>, see
+ * {@link PluralRules}.
+ * </p>
+ *
+ * ported from Java
+ * @stable ICU 4.0
+ */
+
+class U_I18N_API PluralFormat : public Format {
+public:
+
+ /**
+ * Creates a new <code>PluralFormat</code> for the default locale.
+ * This locale will be used to get the set of plural rules and for standard
+ * number formatting.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given locale.
+ * @param locale the <code>PluralFormat</code> will be configured with
+ * rules for this locale. This locale will also be used for
+ * standard number formatting.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const Locale& locale, UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given set of rules.
+ * The standard number formatting will be done using the default locale.
+ * @param rules defines the behavior of the <code>PluralFormat</code>
+ * object.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const PluralRules& rules, UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given set of rules.
+ * The standard number formatting will be done using the given locale.
+ * @param locale the default number formatting will be done using this
+ * locale.
+ * @param rules defines the behavior of the <code>PluralFormat</code>
+ * object.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const Locale& locale, const PluralRules& rules, UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given pattern string.
+ * The default locale will be used to get the set of plural rules and for
+ * standard number formatting.
+ * @param pattern the pattern for this <code>PluralFormat</code>.
+ * errors are returned to status if the pattern is invalid.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const UnicodeString& pattern, UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given pattern string and
+ * locale.
+ * The locale will be used to get the set of plural rules and for
+ * standard number formatting.
+ * @param locale the <code>PluralFormat</code> will be configured with
+ * rules for this locale. This locale will also be used for
+ * standard number formatting.
+ * @param pattern the pattern for this <code>PluralFormat</code>.
+ * errors are returned to status if the pattern is invalid.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const Locale& locale, const UnicodeString& pattern, UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given set of rules, a
+ * pattern and a locale.
+ * @param rules defines the behavior of the <code>PluralFormat</code>
+ * object.
+ * @param pattern the pattern for this <code>PluralFormat</code>.
+ * errors are returned to status if the pattern is invalid.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const PluralRules& rules,
+ const UnicodeString& pattern,
+ UErrorCode& status);
+
+ /**
+ * Creates a new <code>PluralFormat</code> for a given set of rules, a
+ * pattern and a locale.
+ * @param locale the <code>PluralFormat</code> will be configured with
+ * rules for this locale. This locale will also be used for
+ * standard number formatting.
+ * @param rules defines the behavior of the <code>PluralFormat</code>
+ * object.
+ * @param pattern the pattern for this <code>PluralFormat</code>.
+ * errors are returned to status if the pattern is invalid.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const Locale& locale,
+ const PluralRules& rules,
+ const UnicodeString& pattern,
+ UErrorCode& status);
+
+ /**
+ * copy constructor.
+ * @stable ICU 4.0
+ */
+ PluralFormat(const PluralFormat& other);
+
+ /**
+ * Destructor.
+ * @stable ICU 4.0
+ */
+ virtual ~PluralFormat();
+
+ /**
+ * Sets the pattern used by this plural format.
+ * The method parses the pattern and creates a map of format strings
+ * for the plural rules.
+ * Patterns and their interpretation are specified in the class description.
+ *
+ * @param pattern the pattern for this plural format
+ * errors are returned to status if the pattern is invalid.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ void applyPattern(const UnicodeString& pattern, UErrorCode& status);
+
+
+ using Format::format;
+
+ /**
+ * Formats a plural message for a given number.
+ *
+ * @param number a number for which the plural message should be formatted
+ * for. If no pattern has been applied to this
+ * <code>PluralFormat</code> object yet, the formatted number
+ * will be returned.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @return the string containing the formatted plural message.
+ * @stable ICU 4.0
+ */
+ UnicodeString format(int32_t number, UErrorCode& status) const;
+
+ /**
+ * Formats a plural message for a given number.
+ *
+ * @param number a number for which the plural message should be formatted
+ * for. If no pattern has been applied to this
+ * PluralFormat object yet, the formatted number
+ * will be returned.
+ * @param status output param set to success or failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @return the string containing the formatted plural message.
+ * @stable ICU 4.0
+ */
+ UnicodeString format(double number, UErrorCode& status) const;
+
+ /**
+ * Formats a plural message for a given number.
+ *
+ * @param number a number for which the plural message should be formatted
+ * for. If no pattern has been applied to this
+ * <code>PluralFormat</code> object yet, the formatted number
+ * will be returned.
+ * @param appendTo output parameter to receive result.
+ * result is appended to existing contents.
+ * @param pos On input: an alignment field, if desired.
+ * On output: the offsets of the alignment field.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @return the string containing the formatted plural message.
+ * @stable ICU 4.0
+ */
+ UnicodeString& format(int32_t number,
+ UnicodeString& appendTo,
+ FieldPosition& pos,
+ UErrorCode& status) const;
+
+ /**
+ * Formats a plural message for a given number.
+ *
+ * @param number a number for which the plural message should be formatted
+ * for. If no pattern has been applied to this
+ * PluralFormat object yet, the formatted number
+ * will be returned.
+ * @param appendTo output parameter to receive result.
+ * result is appended to existing contents.
+ * @param pos On input: an alignment field, if desired.
+ * On output: the offsets of the alignment field.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @return the string containing the formatted plural message.
+ * @stable ICU 4.0
+ */
+ UnicodeString& format(double number,
+ UnicodeString& appendTo,
+ FieldPosition& pos,
+ UErrorCode& status) const;
+
+ /**
+ * Sets the locale used by this <code>PluraFormat</code> object.
+ * Note: Calling this method resets this <code>PluraFormat</code> object,
+ * i.e., a pattern that was applied previously will be removed,
+ * and the NumberFormat is set to the default number format for
+ * the locale. The resulting format behaves the same as one
+ * constructed from {@link #PluralFormat(const Locale& locale, UErrorCode& status)}.
+ * @param locale the <code>locale</code> to use to configure the formatter.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ void setLocale(const Locale& locale, UErrorCode& status);
+
+ /**
+ * Sets the number format used by this formatter. You only need to
+ * call this if you want a different number format than the default
+ * formatter for the locale.
+ * @param format the number format to use.
+ * @param status output param set to success/failure code on exit, which
+ * must not indicate a failure before the function call.
+ * @stable ICU 4.0
+ */
+ void setNumberFormat(const NumberFormat* format, UErrorCode& status);
+
+ /**
+ * Assignment operator
+ *
+ * @param other the PluralFormat object to copy from.
+ * @stable ICU 4.0
+ */
+ PluralFormat& operator=(const PluralFormat& other);
+
+ /**
+ * Return true if another object is semantically equal to this one.
+ *
+ * @param other the PluralFormat object to be compared with.
+ * @return true if other is semantically equal to this.
+ * @stable ICU 4.0
+ */
+ virtual UBool operator==(const Format& other) const;
+
+ /**
+ * Return true if another object is semantically unequal to this one.
+ *
+ * @param other the PluralFormat object to be compared with.
+ * @return true if other is semantically unequal to this.
+ * @stable ICU 4.0
+ */
+ virtual UBool operator!=(const Format& other) const;
+
+ /**
+ * Clones this Format object polymorphically. The caller owns the
+ * result and should delete it when done.
+ * @stable ICU 4.0
+ */
+ virtual Format* clone(void) const;
+
+ /**
+ * Redeclared Format method.
+ *
+ * @param obj The object to be formatted into a string.
+ * @param appendTo output parameter to receive result.
+ * Result is appended to existing contents.
+ * @param pos On input: an alignment field, if desired.
+ * On output: the offsets of the alignment field.
+ * @param status output param filled with success/failure status.
+ * @return Reference to 'appendTo' parameter.
+ * @stable ICU 4.0
+ */
+ UnicodeString& format(const Formattable& obj,
+ UnicodeString& appendTo,
+ FieldPosition& pos,
+ UErrorCode& status) const;
+
+ /**
+ * Returns the pattern from applyPattern() or constructor().
+ *
+ * @param appendTo output parameter to receive result.
+ * Result is appended to existing contents.
+ * @return the UnicodeString with inserted pattern.
+ * @stable ICU 4.0
+ */
+ UnicodeString& toPattern(UnicodeString& appendTo);
+
+ /**
+ * This method is not yet supported by <code>PluralFormat</code>.
+ * <P>
+ * Before calling, set parse_pos.index to the offset you want to start
+ * parsing at in the source. After calling, parse_pos.index is the end of
+ * the text you parsed. If error occurs, index is unchanged.
+ * <P>
+ * When parsing, leading whitespace is discarded (with a successful parse),
+ * while trailing whitespace is left as is.
+ * <P>
+ * See Format::parseObject() for more.
+ *
+ * @param source The string to be parsed into an object.
+ * @param result Formattable to be set to the parse result.
+ * If parse fails, return contents are undefined.
+ * @param parse_pos The position to start parsing at. Upon return
+ * this param is set to the position after the
+ * last character successfully parsed. If the
+ * source is not parsed successfully, this param
+ * will remain unchanged.
+ * @stable ICU 4.0
+ */
+ virtual void parseObject(const UnicodeString& source,
+ Formattable& result,
+ ParsePosition& parse_pos) const;
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for this class.
+ *
+ * @stable ICU 4.0
+ *
+ */
+ static UClassID U_EXPORT2 getStaticClassID(void);
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for the actual class.
+ *
+ * @stable ICU 4.0
+ */
+ virtual UClassID getDynamicClassID() const;
+
+private:
+ typedef enum fmtToken {
+ none,
+ tLetter,
+ tNumber,
+ tSpace,
+ tNumberSign,
+ tLeftBrace,
+ tRightBrace
+ }fmtToken;
+
+ Locale locale;
+ PluralRules* pluralRules;
+ UnicodeString pattern;
+ Hashtable *fParsedValuesHash;
+ NumberFormat* numberFormat;
+ NumberFormat* replacedNumberFormat;
+
+ PluralFormat(); // default constructor not implemented
+ void init(const PluralRules* rules, const Locale& curlocale, UErrorCode& status);
+ UBool inRange(UChar ch, fmtToken& type);
+ UBool checkSufficientDefinition();
+ void parsingFailure();
+ UnicodeString insertFormattedNumber(double number,
+ UnicodeString& message,
+ UnicodeString& appendTo,
+ FieldPosition& pos) const;
+ void copyHashtable(Hashtable *other, UErrorCode& status);
+};
+
+U_NAMESPACE_END
+
+#endif /* #if !UCONFIG_NO_FORMATTING */
+
+#endif // _PLURFMT
+//eof
Property changes on: icu46/source/i18n/unicode/plurfmt.h
___________________________________________________________________
Added: svn:eol-style
+ LF
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