| // © 2016 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| /* |
| * Copyright (C) 2007-2013, International Business Machines Corporation and |
| * others. All Rights Reserved. |
| ******************************************************************************** |
| * |
| * File MSGFMT.H |
| * |
| * Modification History: |
| * |
| * Date Name Description |
| * 02/19/97 aliu Converted from java. |
| * 03/20/97 helena Finished first cut of implementation. |
| * 07/22/98 stephen Removed operator!= (defined in Format) |
| * 08/19/2002 srl Removing Javaisms |
| *******************************************************************************/ |
| |
| #ifndef MSGFMT_H |
| #define MSGFMT_H |
| |
| #include "unicode/utypes.h" |
| |
| #if U_SHOW_CPLUSPLUS_API |
| |
| /** |
| * \file |
| * \brief C++ API: Formats messages in a language-neutral way. |
| */ |
| |
| #if !UCONFIG_NO_FORMATTING |
| |
| #include "unicode/format.h" |
| #include "unicode/locid.h" |
| #include "unicode/messagepattern.h" |
| #include "unicode/parseerr.h" |
| #include "unicode/plurfmt.h" |
| #include "unicode/plurrule.h" |
| |
| U_CDECL_BEGIN |
| // Forward declaration. |
| struct UHashtable; |
| typedef struct UHashtable UHashtable; /**< @internal */ |
| U_CDECL_END |
| |
| U_NAMESPACE_BEGIN |
| |
| class AppendableWrapper; |
| class DateFormat; |
| class NumberFormat; |
| |
| /** |
| * <p>MessageFormat prepares strings for display to users, |
| * with optional arguments (variables/placeholders). |
| * The arguments can occur in any order, which is necessary for translation |
| * into languages with different grammars. |
| * |
| * <p>A MessageFormat is constructed from a <em>pattern</em> string |
| * with arguments in {curly braces} which will be replaced by formatted values. |
| * |
| * <p><code>MessageFormat</code> differs from the other <code>Format</code> |
| * classes in that you create a <code>MessageFormat</code> object with one |
| * of its constructors (not with a <code>createInstance</code> style factory |
| * method). Factory methods aren't necessary because <code>MessageFormat</code> |
| * itself doesn't implement locale-specific behavior. Any locale-specific |
| * behavior is defined by the pattern that you provide and the |
| * subformats used for inserted arguments. |
| * |
| * <p>Arguments can be named (using identifiers) or numbered (using small ASCII-digit integers). |
| * Some of the API methods work only with argument numbers and throw an exception |
| * if the pattern has named arguments (see {@link #usesNamedArguments()}). |
| * |
| * <p>An argument might not specify any format type. In this case, |
| * a numeric value is formatted with a default (for the locale) NumberFormat, |
| * and a date/time value is formatted with a default (for the locale) DateFormat. |
| * |
| * <p>An argument might specify a "simple" type for which the specified |
| * Format object is created, cached and used. |
| * |
| * <p>An argument might have a "complex" type with nested MessageFormat sub-patterns. |
| * During formatting, one of these sub-messages is selected according to the argument value |
| * and recursively formatted. |
| * |
| * <p>After construction, a custom Format object can be set for |
| * a top-level argument, overriding the default formatting and parsing behavior |
| * for that argument. |
| * However, custom formatting can be achieved more simply by writing |
| * a typeless argument in the pattern string |
| * and supplying it with a preformatted string value. |
| * |
| * <p>When formatting, MessageFormat takes a collection of argument values |
| * and writes an output string. |
| * The argument values may be passed as an array |
| * (when the pattern contains only numbered arguments) |
| * or as an array of names and and an array of arguments (which works for both named |
| * and numbered arguments). |
| * |
| * <p>Each argument is matched with one of the input values by array index or argument name |
| * and formatted according to its pattern specification |
| * (or using a custom Format object if one was set). |
| * A numbered pattern argument is matched with an argument name that contains that number |
| * as an ASCII-decimal-digit string (without leading zero). |
| * |
| * <h4><a name="patterns">Patterns and Their Interpretation</a></h4> |
| * |
| * <code>MessageFormat</code> uses patterns of the following form: |
| * <pre> |
| * message = messageText (argument messageText)* |
| * argument = noneArg | simpleArg | complexArg |
| * complexArg = choiceArg | pluralArg | selectArg | selectordinalArg |
| * |
| * noneArg = '{' argNameOrNumber '}' |
| * simpleArg = '{' argNameOrNumber ',' argType [',' argStyle] '}' |
| * choiceArg = '{' argNameOrNumber ',' "choice" ',' choiceStyle '}' |
| * pluralArg = '{' argNameOrNumber ',' "plural" ',' pluralStyle '}' |
| * selectArg = '{' argNameOrNumber ',' "select" ',' selectStyle '}' |
| * selectordinalArg = '{' argNameOrNumber ',' "selectordinal" ',' pluralStyle '}' |
| * |
| * choiceStyle: see {@link ChoiceFormat} |
| * pluralStyle: see {@link PluralFormat} |
| * selectStyle: see {@link SelectFormat} |
| * |
| * argNameOrNumber = argName | argNumber |
| * argName = [^[[:Pattern_Syntax:][:Pattern_White_Space:]]]+ |
| * argNumber = '0' | ('1'..'9' ('0'..'9')*) |
| * |
| * argType = "number" | "date" | "time" | "spellout" | "ordinal" | "duration" |
| * argStyle = "short" | "medium" | "long" | "full" | "integer" | "currency" | "percent" | argStyleText | "::" argSkeletonText |
| * </pre> |
| * |
| * <ul> |
| * <li>messageText can contain quoted literal strings including syntax characters. |
| * A quoted literal string begins with an ASCII apostrophe and a syntax character |
| * (usually a {curly brace}) and continues until the next single apostrophe. |
| * A double ASCII apostrohpe inside or outside of a quoted string represents |
| * one literal apostrophe. |
| * <li>Quotable syntax characters are the {curly braces} in all messageText parts, |
| * plus the '#' sign in a messageText immediately inside a pluralStyle, |
| * and the '|' symbol in a messageText immediately inside a choiceStyle. |
| * <li>See also {@link #UMessagePatternApostropheMode} |
| * <li>In argStyleText, every single ASCII apostrophe begins and ends quoted literal text, |
| * and unquoted {curly braces} must occur in matched pairs. |
| * </ul> |
| * |
| * <p>Recommendation: Use the real apostrophe (single quote) character |
| * \htmlonly’\endhtmlonly (U+2019) for |
| * human-readable text, and use the ASCII apostrophe ' (U+0027) |
| * only in program syntax, like quoting in MessageFormat. |
| * See the annotations for U+0027 Apostrophe in The Unicode Standard. |
| * |
| * <p>The <code>choice</code> argument type is deprecated. |
| * Use <code>plural</code> arguments for proper plural selection, |
| * and <code>select</code> arguments for simple selection among a fixed set of choices. |
| * |
| * <p>The <code>argType</code> and <code>argStyle</code> values are used to create |
| * a <code>Format</code> instance for the format element. The following |
| * table shows how the values map to Format instances. Combinations not |
| * shown in the table are illegal. Any <code>argStyleText</code> must |
| * be a valid pattern string for the Format subclass used. |
| * |
| * <p><table border=1> |
| * <tr> |
| * <th>argType |
| * <th>argStyle |
| * <th>resulting Format object |
| * <tr> |
| * <td colspan=2><i>(none)</i> |
| * <td><code>null</code> |
| * <tr> |
| * <td rowspan=6><code>number</code> |
| * <td><i>(none)</i> |
| * <td><code>NumberFormat.createInstance(getLocale(), status)</code> |
| * <tr> |
| * <td><code>integer</code> |
| * <td><code>NumberFormat.createInstance(getLocale(), kNumberStyle, status)</code> |
| * <tr> |
| * <td><code>currency</code> |
| * <td><code>NumberFormat.createCurrencyInstance(getLocale(), status)</code> |
| * <tr> |
| * <td><code>percent</code> |
| * <td><code>NumberFormat.createPercentInstance(getLocale(), status)</code> |
| * <tr> |
| * <td><i>argStyleText</i> |
| * <td><code>new DecimalFormat(argStyleText, new DecimalFormatSymbols(getLocale(), status), status)</code> |
| * <tr> |
| * <td><i>argSkeletonText</i> |
| * <td><code>NumberFormatter::forSkeleton(argSkeletonText, status).locale(getLocale()).toFormat(status)</code> |
| * <tr> |
| * <td rowspan=7><code>date</code> |
| * <td><i>(none)</i> |
| * <td><code>DateFormat.createDateInstance(kDefault, getLocale(), status)</code> |
| * <tr> |
| * <td><code>short</code> |
| * <td><code>DateFormat.createDateInstance(kShort, getLocale(), status)</code> |
| * <tr> |
| * <td><code>medium</code> |
| * <td><code>DateFormat.createDateInstance(kDefault, getLocale(), status)</code> |
| * <tr> |
| * <td><code>long</code> |
| * <td><code>DateFormat.createDateInstance(kLong, getLocale(), status)</code> |
| * <tr> |
| * <td><code>full</code> |
| * <td><code>DateFormat.createDateInstance(kFull, getLocale(), status)</code> |
| * <tr> |
| * <td><i>argStyleText</i> |
| * <td><code>new SimpleDateFormat(argStyleText, getLocale(), status)</code> |
| * <tr> |
| * <td><i>argSkeletonText</i> |
| * <td><code>DateFormat::createInstanceForSkeleton(argSkeletonText, getLocale(), status)</code> |
| * <tr> |
| * <td rowspan=6><code>time</code> |
| * <td><i>(none)</i> |
| * <td><code>DateFormat.createTimeInstance(kDefault, getLocale(), status)</code> |
| * <tr> |
| * <td><code>short</code> |
| * <td><code>DateFormat.createTimeInstance(kShort, getLocale(), status)</code> |
| * <tr> |
| * <td><code>medium</code> |
| * <td><code>DateFormat.createTimeInstance(kDefault, getLocale(), status)</code> |
| * <tr> |
| * <td><code>long</code> |
| * <td><code>DateFormat.createTimeInstance(kLong, getLocale(), status)</code> |
| * <tr> |
| * <td><code>full</code> |
| * <td><code>DateFormat.createTimeInstance(kFull, getLocale(), status)</code> |
| * <tr> |
| * <td><i>argStyleText</i> |
| * <td><code>new SimpleDateFormat(argStyleText, getLocale(), status)</code> |
| * <tr> |
| * <td><code>spellout</code> |
| * <td><i>argStyleText (optional)</i> |
| * <td><code>new RuleBasedNumberFormat(URBNF_SPELLOUT, getLocale(), status) |
| * <br/> .setDefaultRuleset(argStyleText, status);</code> |
| * <tr> |
| * <td><code>ordinal</code> |
| * <td><i>argStyleText (optional)</i> |
| * <td><code>new RuleBasedNumberFormat(URBNF_ORDINAL, getLocale(), status) |
| * <br/> .setDefaultRuleset(argStyleText, status);</code> |
| * <tr> |
| * <td><code>duration</code> |
| * <td><i>argStyleText (optional)</i> |
| * <td><code>new RuleBasedNumberFormat(URBNF_DURATION, getLocale(), status) |
| * <br/> .setDefaultRuleset(argStyleText, status);</code> |
| * </table> |
| * <p> |
| * |
| * <h4>Argument formatting</h4> |
| * |
| * <p>Arguments are formatted according to their type, using the default |
| * ICU formatters for those types, unless otherwise specified.</p> |
| * |
| * <p>There are also several ways to control the formatting.</p> |
| * |
| * <p>We recommend you use default styles, predefined style values, skeletons, |
| * or preformatted values, but not pattern strings or custom format objects.</p> |
| * |
| * <p>For more details, see the |
| * <a href="https://unicode-org.github.io/icu/userguide/format_parse/messages">ICU User Guide</a>.</p> |
| * |
| * <h4>Usage Information</h4> |
| * |
| * <p>Here are some examples of usage: |
| * Example 1: |
| * |
| * <pre> |
| * \code |
| * UErrorCode success = U_ZERO_ERROR; |
| * GregorianCalendar cal(success); |
| * Formattable arguments[] = { |
| * 7L, |
| * Formattable( (Date) cal.getTime(success), Formattable::kIsDate), |
| * "a disturbance in the Force" |
| * }; |
| * |
| * UnicodeString result; |
| * MessageFormat::format( |
| * "At {1,time,::jmm} on {1,date,::dMMMM}, there was {2} on planet {0,number}.", |
| * arguments, 3, result, success ); |
| * |
| * cout << "result: " << result << endl; |
| * //<output>: At 4:34 PM on March 23, there was a disturbance |
| * // in the Force on planet 7. |
| * \endcode |
| * </pre> |
| * |
| * Typically, the message format will come from resources, and the |
| * arguments will be dynamically set at runtime. |
| * |
| * <p>Example 2: |
| * |
| * <pre> |
| * \code |
| * success = U_ZERO_ERROR; |
| * Formattable testArgs[] = {3L, "MyDisk"}; |
| * |
| * MessageFormat form( |
| * "The disk \"{1}\" contains {0} file(s).", success ); |
| * |
| * UnicodeString string; |
| * FieldPosition fpos = 0; |
| * cout << "format: " << form.format(testArgs, 2, string, fpos, success ) << endl; |
| * |
| * // output, with different testArgs: |
| * // output: The disk "MyDisk" contains 0 file(s). |
| * // output: The disk "MyDisk" contains 1 file(s). |
| * // output: The disk "MyDisk" contains 1,273 file(s). |
| * \endcode |
| * </pre> |
| * |
| * |
| * <p>For messages that include plural forms, you can use a plural argument: |
| * <pre> |
| * \code |
| * success = U_ZERO_ERROR; |
| * MessageFormat msgFmt( |
| * "{num_files, plural, " |
| * "=0{There are no files on disk \"{disk_name}\".}" |
| * "=1{There is one file on disk \"{disk_name}\".}" |
| * "other{There are # files on disk \"{disk_name}\".}}", |
| * Locale("en"), |
| * success); |
| * FieldPosition fpos = 0; |
| * Formattable testArgs[] = {0L, "MyDisk"}; |
| * UnicodeString testArgsNames[] = {"num_files", "disk_name"}; |
| * UnicodeString result; |
| * cout << msgFmt.format(testArgs, testArgsNames, 2, result, fpos, 0, success); |
| * testArgs[0] = 3L; |
| * cout << msgFmt.format(testArgs, testArgsNames, 2, result, fpos, 0, success); |
| * \endcode |
| * <em>output</em>: |
| * There are no files on disk "MyDisk". |
| * There are 3 files on "MyDisk". |
| * </pre> |
| * See {@link PluralFormat} and {@link PluralRules} for details. |
| * |
| * <h4><a name="synchronization">Synchronization</a></h4> |
| * |
| * <p>MessageFormats are not synchronized. |
| * It is recommended to create separate format instances for each thread. |
| * If multiple threads access a format concurrently, it must be synchronized |
| * externally. |
| * |
| * @stable ICU 2.0 |
| */ |
| class U_I18N_API MessageFormat : public Format { |
| public: |
| #ifndef U_HIDE_OBSOLETE_API |
| /** |
| * Enum type for kMaxFormat. |
| * @obsolete ICU 3.0. The 10-argument limit was removed as of ICU 2.6, |
| * rendering this enum type obsolete. |
| */ |
| enum EFormatNumber { |
| /** |
| * The maximum number of arguments. |
| * @obsolete ICU 3.0. The 10-argument limit was removed as of ICU 2.6, |
| * rendering this constant obsolete. |
| */ |
| kMaxFormat = 10 |
| }; |
| #endif /* U_HIDE_OBSOLETE_API */ |
| |
| /** |
| * Constructs a new MessageFormat using the given pattern and the |
| * default locale. |
| * |
| * @param pattern Pattern used to construct object. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @stable ICU 2.0 |
| */ |
| MessageFormat(const UnicodeString& pattern, |
| UErrorCode &status); |
| |
| /** |
| * Constructs a new MessageFormat using the given pattern and locale. |
| * @param pattern Pattern used to construct object. |
| * @param newLocale The locale to use for formatting dates and numbers. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @stable ICU 2.0 |
| */ |
| MessageFormat(const UnicodeString& pattern, |
| const Locale& newLocale, |
| UErrorCode& status); |
| /** |
| * Constructs a new MessageFormat using the given pattern and locale. |
| * @param pattern Pattern used to construct object. |
| * @param newLocale The locale to use for formatting dates and numbers. |
| * @param parseError Struct to receive information on the position |
| * of an error within the pattern. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @stable ICU 2.0 |
| */ |
| MessageFormat(const UnicodeString& pattern, |
| const Locale& newLocale, |
| UParseError& parseError, |
| UErrorCode& status); |
| /** |
| * Constructs a new MessageFormat from an existing one. |
| * @stable ICU 2.0 |
| */ |
| MessageFormat(const MessageFormat&); |
| |
| /** |
| * Assignment operator. |
| * @stable ICU 2.0 |
| */ |
| const MessageFormat& operator=(const MessageFormat&); |
| |
| /** |
| * Destructor. |
| * @stable ICU 2.0 |
| */ |
| virtual ~MessageFormat(); |
| |
| /** |
| * Clones this Format object polymorphically. The caller owns the |
| * result and should delete it when done. |
| * @stable ICU 2.0 |
| */ |
| virtual MessageFormat* clone() const; |
| |
| /** |
| * Returns true if the given Format objects are semantically equal. |
| * Objects of different subclasses are considered unequal. |
| * @param other the object to be compared with. |
| * @return true if the given Format objects are semantically equal. |
| * @stable ICU 2.0 |
| */ |
| virtual UBool operator==(const Format& other) const; |
| |
| /** |
| * Sets the locale to be used for creating argument Format objects. |
| * @param theLocale the new locale value to be set. |
| * @stable ICU 2.0 |
| */ |
| virtual void setLocale(const Locale& theLocale); |
| |
| /** |
| * Gets the locale used for creating argument Format objects. |
| * format information. |
| * @return the locale of the object. |
| * @stable ICU 2.0 |
| */ |
| virtual const Locale& getLocale(void) const; |
| |
| /** |
| * Applies the given pattern string to this message format. |
| * |
| * @param pattern The pattern to be applied. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @stable ICU 2.0 |
| */ |
| virtual void applyPattern(const UnicodeString& pattern, |
| UErrorCode& status); |
| /** |
| * Applies the given pattern string to this message format. |
| * |
| * @param pattern The pattern to be applied. |
| * @param parseError Struct to receive information on the position |
| * of an error within the pattern. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @stable ICU 2.0 |
| */ |
| virtual void applyPattern(const UnicodeString& pattern, |
| UParseError& parseError, |
| UErrorCode& status); |
| |
| /** |
| * Sets the UMessagePatternApostropheMode and the pattern used by this message format. |
| * Parses the pattern and caches Format objects for simple argument types. |
| * Patterns and their interpretation are specified in the |
| * <a href="#patterns">class description</a>. |
| * <p> |
| * This method is best used only once on a given object to avoid confusion about the mode, |
| * and after constructing the object with an empty pattern string to minimize overhead. |
| * |
| * @param pattern The pattern to be applied. |
| * @param aposMode The new apostrophe mode. |
| * @param parseError Struct to receive information on the position |
| * of an error within the pattern. |
| * Can be NULL. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @stable ICU 4.8 |
| */ |
| virtual void applyPattern(const UnicodeString& pattern, |
| UMessagePatternApostropheMode aposMode, |
| UParseError* parseError, |
| UErrorCode& status); |
| |
| /** |
| * @return this instance's UMessagePatternApostropheMode. |
| * @stable ICU 4.8 |
| */ |
| UMessagePatternApostropheMode getApostropheMode() const { |
| return msgPattern.getApostropheMode(); |
| } |
| |
| /** |
| * Returns a pattern that can be used to recreate this object. |
| * |
| * @param appendTo Output parameter to receive the pattern. |
| * Result is appended to existing contents. |
| * @return Reference to 'appendTo' parameter. |
| * @stable ICU 2.0 |
| */ |
| virtual UnicodeString& toPattern(UnicodeString& appendTo) const; |
| |
| /** |
| * Sets subformats. |
| * See the class description about format numbering. |
| * The caller should not delete the Format objects after this call. |
| * <EM>The array formatsToAdopt is not itself adopted.</EM> Its |
| * ownership is retained by the caller. If the call fails because |
| * memory cannot be allocated, then the formats will be deleted |
| * by this method, and this object will remain unchanged. |
| * |
| * <p>If this format uses named arguments, the new formats are discarded |
| * and this format remains unchanged. |
| * |
| * @stable ICU 2.0 |
| * @param formatsToAdopt the format to be adopted. |
| * @param count the size of the array. |
| */ |
| virtual void adoptFormats(Format** formatsToAdopt, int32_t count); |
| |
| /** |
| * Sets subformats. |
| * See the class description about format numbering. |
| * Each item in the array is cloned into the internal array. |
| * If the call fails because memory cannot be allocated, then this |
| * object will remain unchanged. |
| * |
| * <p>If this format uses named arguments, the new formats are discarded |
| * and this format remains unchanged. |
| * |
| * @stable ICU 2.0 |
| * @param newFormats the new format to be set. |
| * @param cnt the size of the array. |
| */ |
| virtual void setFormats(const Format** newFormats, int32_t cnt); |
| |
| |
| /** |
| * Sets one subformat. |
| * See the class description about format numbering. |
| * The caller should not delete the Format object after this call. |
| * If the number is over the number of formats already set, |
| * the item will be deleted and ignored. |
| * |
| * <p>If this format uses named arguments, the new format is discarded |
| * and this format remains unchanged. |
| * |
| * @stable ICU 2.0 |
| * @param formatNumber index of the subformat. |
| * @param formatToAdopt the format to be adopted. |
| */ |
| virtual void adoptFormat(int32_t formatNumber, Format* formatToAdopt); |
| |
| /** |
| * Sets one subformat. |
| * See the class description about format numbering. |
| * If the number is over the number of formats already set, |
| * the item will be ignored. |
| * @param formatNumber index of the subformat. |
| * @param format the format to be set. |
| * @stable ICU 2.0 |
| */ |
| virtual void setFormat(int32_t formatNumber, const Format& format); |
| |
| /** |
| * Gets format names. This function returns formatNames in StringEnumerations |
| * which can be used with getFormat() and setFormat() to export formattable |
| * array from current MessageFormat to another. It is the caller's responsibility |
| * to delete the returned formatNames. |
| * @param status output param set to success/failure code. |
| * @stable ICU 4.0 |
| */ |
| virtual StringEnumeration* getFormatNames(UErrorCode& status); |
| |
| /** |
| * Gets subformat pointer for given format name. |
| * This function supports both named and numbered |
| * arguments. If numbered, the formatName is the |
| * corresponding UnicodeStrings (e.g. "0", "1", "2"...). |
| * The returned Format object should not be deleted by the caller, |
| * nor should the ponter of other object . The pointer and its |
| * contents remain valid only until the next call to any method |
| * of this class is made with this object. |
| * @param formatName the name or number specifying a format |
| * @param status output param set to success/failure code. |
| * @stable ICU 4.0 |
| */ |
| virtual Format* getFormat(const UnicodeString& formatName, UErrorCode& status); |
| |
| /** |
| * Sets one subformat for given format name. |
| * See the class description about format name. |
| * This function supports both named and numbered |
| * arguments-- if numbered, the formatName is the |
| * corresponding UnicodeStrings (e.g. "0", "1", "2"...). |
| * If there is no matched formatName or wrong type, |
| * the item will be ignored. |
| * @param formatName Name of the subformat. |
| * @param format the format to be set. |
| * @param status output param set to success/failure code. |
| * @stable ICU 4.0 |
| */ |
| virtual void setFormat(const UnicodeString& formatName, const Format& format, UErrorCode& status); |
| |
| /** |
| * Sets one subformat for given format name. |
| * See the class description about format name. |
| * This function supports both named and numbered |
| * arguments-- if numbered, the formatName is the |
| * corresponding UnicodeStrings (e.g. "0", "1", "2"...). |
| * If there is no matched formatName or wrong type, |
| * the item will be ignored. |
| * The caller should not delete the Format object after this call. |
| * @param formatName Name of the subformat. |
| * @param formatToAdopt Format to be adopted. |
| * @param status output param set to success/failure code. |
| * @stable ICU 4.0 |
| */ |
| virtual void adoptFormat(const UnicodeString& formatName, Format* formatToAdopt, UErrorCode& status); |
| |
| /** |
| * Gets an array of subformats of this object. The returned array |
| * should not be deleted by the caller, nor should the pointers |
| * within the array. The array and its contents remain valid only |
| * until the next call to this format. See the class description |
| * about format numbering. |
| * |
| * @param count output parameter to receive the size of the array |
| * @return an array of count Format* objects, or NULL if out of |
| * memory. Any or all of the array elements may be NULL. |
| * @stable ICU 2.0 |
| */ |
| virtual const Format** getFormats(int32_t& count) const; |
| |
| |
| using Format::format; |
| |
| /** |
| * Formats the given array of arguments into a user-readable string. |
| * Does not take ownership of the Formattable* array or its contents. |
| * |
| * <p>If this format uses named arguments, appendTo is unchanged and |
| * status is set to U_ILLEGAL_ARGUMENT_ERROR. |
| * |
| * @param source An array of objects to be formatted. |
| * @param count The number of elements of 'source'. |
| * @param appendTo Output parameter to receive result. |
| * Result is appended to existing contents. |
| * @param ignore Not used; inherited from base class API. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @return Reference to 'appendTo' parameter. |
| * @stable ICU 2.0 |
| */ |
| UnicodeString& format(const Formattable* source, |
| int32_t count, |
| UnicodeString& appendTo, |
| FieldPosition& ignore, |
| UErrorCode& status) const; |
| |
| /** |
| * Formats the given array of arguments into a user-readable string |
| * using the given pattern. |
| * |
| * <p>If this format uses named arguments, appendTo is unchanged and |
| * status is set to U_ILLEGAL_ARGUMENT_ERROR. |
| * |
| * @param pattern The pattern. |
| * @param arguments An array of objects to be formatted. |
| * @param count The number of elements of 'source'. |
| * @param appendTo Output parameter to receive result. |
| * Result is appended to existing contents. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @return Reference to 'appendTo' parameter. |
| * @stable ICU 2.0 |
| */ |
| static UnicodeString& format(const UnicodeString& pattern, |
| const Formattable* arguments, |
| int32_t count, |
| UnicodeString& appendTo, |
| UErrorCode& status); |
| |
| /** |
| * Formats the given array of arguments into a user-readable |
| * string. The array must be stored within a single Formattable |
| * object of type kArray. If the Formattable object type is not of |
| * type kArray, then returns a failing UErrorCode. |
| * |
| * <p>If this format uses named arguments, appendTo is unchanged and |
| * status is set to U_ILLEGAL_ARGUMENT_ERROR. |
| * |
| * @param obj A Formattable of type kArray containing |
| * arguments to be formatted. |
| * @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 Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @return Reference to 'appendTo' parameter. |
| * @stable ICU 2.0 |
| */ |
| virtual UnicodeString& format(const Formattable& obj, |
| UnicodeString& appendTo, |
| FieldPosition& pos, |
| UErrorCode& status) const; |
| |
| /** |
| * Formats the given array of arguments into a user-defined argument name |
| * array. This function supports both named and numbered |
| * arguments-- if numbered, the formatName is the |
| * corresponding UnicodeStrings (e.g. "0", "1", "2"...). |
| * |
| * @param argumentNames argument name array |
| * @param arguments An array of objects to be formatted. |
| * @param count The number of elements of 'argumentNames' and |
| * arguments. The number of argumentNames and arguments |
| * must be the same. |
| * @param appendTo Output parameter to receive result. |
| * Result is appended to existing contents. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @return Reference to 'appendTo' parameter. |
| * @stable ICU 4.0 |
| */ |
| UnicodeString& format(const UnicodeString* argumentNames, |
| const Formattable* arguments, |
| int32_t count, |
| UnicodeString& appendTo, |
| UErrorCode& status) const; |
| /** |
| * Parses the given string into an array of output arguments. |
| * |
| * @param source String to be parsed. |
| * @param pos On input, starting position for parse. On output, |
| * final position after parse. Unchanged if parse |
| * fails. |
| * @param count Output parameter to receive the number of arguments |
| * parsed. |
| * @return an array of parsed arguments. The caller owns both |
| * the array and its contents. |
| * @stable ICU 2.0 |
| */ |
| virtual Formattable* parse(const UnicodeString& source, |
| ParsePosition& pos, |
| int32_t& count) const; |
| |
| /** |
| * Parses the given string into an array of output arguments. |
| * |
| * <p>If this format uses named arguments, status is set to |
| * U_ARGUMENT_TYPE_MISMATCH. |
| * |
| * @param source String to be parsed. |
| * @param count Output param to receive size of returned array. |
| * @param status Input/output error code. If the |
| * pattern cannot be parsed, set to failure code. |
| * @return an array of parsed arguments. The caller owns both |
| * the array and its contents. Returns NULL if status is not U_ZERO_ERROR. |
| * |
| * @stable ICU 2.0 |
| */ |
| virtual Formattable* parse(const UnicodeString& source, |
| int32_t& count, |
| UErrorCode& status) const; |
| |
| /** |
| * Parses the given string into an array of output arguments |
| * stored within a single Formattable of type kArray. |
| * |
| * @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 pos On input, starting position for parse. On output, |
| * final position after parse. Unchanged if parse |
| * fails. |
| * @stable ICU 2.0 |
| */ |
| virtual void parseObject(const UnicodeString& source, |
| Formattable& result, |
| ParsePosition& pos) const; |
| |
| /** |
| * Convert an 'apostrophe-friendly' pattern into a standard |
| * pattern. Standard patterns treat all apostrophes as |
| * quotes, which is problematic in some languages, e.g. |
| * French, where apostrophe is commonly used. This utility |
| * assumes that only an unpaired apostrophe immediately before |
| * a brace is a true quote. Other unpaired apostrophes are paired, |
| * and the resulting standard pattern string is returned. |
| * |
| * <p><b>Note</b> it is not guaranteed that the returned pattern |
| * is indeed a valid pattern. The only effect is to convert |
| * between patterns having different quoting semantics. |
| * |
| * @param pattern the 'apostrophe-friendly' patttern to convert |
| * @param status Input/output error code. If the pattern |
| * cannot be parsed, the failure code is set. |
| * @return the standard equivalent of the original pattern |
| * @stable ICU 3.4 |
| */ |
| static UnicodeString autoQuoteApostrophe(const UnicodeString& pattern, |
| UErrorCode& status); |
| |
| |
| /** |
| * Returns true if this MessageFormat uses named arguments, |
| * and false otherwise. See class description. |
| * |
| * @return true if named arguments are used. |
| * @stable ICU 4.0 |
| */ |
| UBool usesNamedArguments() const; |
| |
| |
| #ifndef U_HIDE_INTERNAL_API |
| /** |
| * This API is for ICU internal use only. |
| * Please do not use it. |
| * |
| * Returns argument types count in the parsed pattern. |
| * Used to distinguish pattern "{0} d" and "d". |
| * |
| * @return The number of formattable types in the pattern |
| * @internal |
| */ |
| int32_t getArgTypeCount() const; |
| #endif /* U_HIDE_INTERNAL_API */ |
| |
| /** |
| * Returns a unique class ID POLYMORPHICALLY. Pure virtual override. |
| * This method is to implement a simple version of RTTI, since not all |
| * C++ compilers support genuine RTTI. Polymorphic operator==() and |
| * clone() methods call this method. |
| * |
| * @return The class ID for this object. All objects of a |
| * given class have the same class ID. Objects of |
| * other classes have different class IDs. |
| * @stable ICU 2.0 |
| */ |
| virtual UClassID getDynamicClassID(void) const; |
| |
| /** |
| * Return the class ID for this class. This is useful only for |
| * comparing to a return value from getDynamicClassID(). For example: |
| * <pre> |
| * . Base* polymorphic_pointer = createPolymorphicObject(); |
| * . if (polymorphic_pointer->getDynamicClassID() == |
| * . Derived::getStaticClassID()) ... |
| * </pre> |
| * @return The class ID for all objects of this class. |
| * @stable ICU 2.0 |
| */ |
| static UClassID U_EXPORT2 getStaticClassID(void); |
| |
| #ifndef U_HIDE_INTERNAL_API |
| /** |
| * Compares two Format objects. This is used for constructing the hash |
| * tables. |
| * |
| * @param left pointer to a Format object. Must not be NULL. |
| * @param right pointer to a Format object. Must not be NULL. |
| * |
| * @return whether the two objects are the same |
| * @internal |
| */ |
| static UBool equalFormats(const void* left, const void* right); |
| #endif /* U_HIDE_INTERNAL_API */ |
| |
| private: |
| |
| Locale fLocale; |
| MessagePattern msgPattern; |
| Format** formatAliases; // see getFormats |
| int32_t formatAliasesCapacity; |
| |
| MessageFormat(); // default constructor not implemented |
| |
| /** |
| * This provider helps defer instantiation of a PluralRules object |
| * until we actually need to select a keyword. |
| * For example, if the number matches an explicit-value selector like "=1" |
| * we do not need any PluralRules. |
| */ |
| class U_I18N_API PluralSelectorProvider : public PluralFormat::PluralSelector { |
| public: |
| PluralSelectorProvider(const MessageFormat &mf, UPluralType type); |
| virtual ~PluralSelectorProvider(); |
| virtual UnicodeString select(void *ctx, double number, UErrorCode& ec) const; |
| |
| void reset(); |
| private: |
| const MessageFormat &msgFormat; |
| PluralRules* rules; |
| UPluralType type; |
| }; |
| |
| /** |
| * A MessageFormat formats an array of arguments. Each argument |
| * has an expected type, based on the pattern. For example, if |
| * the pattern contains the subformat "{3,number,integer}", then |
| * we expect argument 3 to have type Formattable::kLong. This |
| * array needs to grow dynamically if the MessageFormat is |
| * modified. |
| */ |
| Formattable::Type* argTypes; |
| int32_t argTypeCount; |
| int32_t argTypeCapacity; |
| |
| /** |
| * true if there are different argTypes for the same argument. |
| * This only matters when the MessageFormat is used in the plain C (umsg_xxx) API |
| * where the pattern argTypes determine how the va_arg list is read. |
| */ |
| UBool hasArgTypeConflicts; |
| |
| // Variable-size array management |
| UBool allocateArgTypes(int32_t capacity, UErrorCode& status); |
| |
| /** |
| * Default Format objects used when no format is specified and a |
| * numeric or date argument is formatted. These are volatile |
| * cache objects maintained only for performance. They do not |
| * participate in operator=(), copy constructor(), nor |
| * operator==(). |
| */ |
| NumberFormat* defaultNumberFormat; |
| DateFormat* defaultDateFormat; |
| |
| UHashtable* cachedFormatters; |
| UHashtable* customFormatArgStarts; |
| |
| PluralSelectorProvider pluralProvider; |
| PluralSelectorProvider ordinalProvider; |
| |
| /** |
| * Method to retrieve default formats (or NULL on failure). |
| * These are semantically const, but may modify *this. |
| */ |
| const NumberFormat* getDefaultNumberFormat(UErrorCode&) const; |
| const DateFormat* getDefaultDateFormat(UErrorCode&) const; |
| |
| /** |
| * Finds the word s, in the keyword list and returns the located index. |
| * @param s the keyword to be searched for. |
| * @param list the list of keywords to be searched with. |
| * @return the index of the list which matches the keyword s. |
| */ |
| static int32_t findKeyword( const UnicodeString& s, |
| const char16_t * const *list); |
| |
| /** |
| * Thin wrapper around the format(... AppendableWrapper ...) variant. |
| * Wraps the destination UnicodeString into an AppendableWrapper and |
| * supplies default values for some other parameters. |
| */ |
| UnicodeString& format(const Formattable* arguments, |
| const UnicodeString *argumentNames, |
| int32_t cnt, |
| UnicodeString& appendTo, |
| FieldPosition* pos, |
| UErrorCode& status) const; |
| |
| /** |
| * Formats the arguments and writes the result into the |
| * AppendableWrapper, updates the field position. |
| * |
| * @param msgStart Index to msgPattern part to start formatting from. |
| * @param plNumber NULL except when formatting a plural argument sub-message |
| * where a '#' is replaced by the format string for this number. |
| * @param arguments The formattable objects array. (Must not be NULL.) |
| * @param argumentNames NULL if numbered values are used. Otherwise the same |
| * length as "arguments", and each entry is the name of the |
| * corresponding argument in "arguments". |
| * @param cnt The length of arguments (and of argumentNames if that is not NULL). |
| * @param appendTo Output parameter to receive the result. |
| * The result string is appended to existing contents. |
| * @param pos Field position status. |
| * @param success The error code status. |
| */ |
| void format(int32_t msgStart, |
| const void *plNumber, |
| const Formattable* arguments, |
| const UnicodeString *argumentNames, |
| int32_t cnt, |
| AppendableWrapper& appendTo, |
| FieldPosition* pos, |
| UErrorCode& success) const; |
| |
| UnicodeString getArgName(int32_t partIndex); |
| |
| void setArgStartFormat(int32_t argStart, Format* formatter, UErrorCode& status); |
| |
| void setCustomArgStartFormat(int32_t argStart, Format* formatter, UErrorCode& status); |
| |
| int32_t nextTopLevelArgStart(int32_t partIndex) const; |
| |
| UBool argNameMatches(int32_t partIndex, const UnicodeString& argName, int32_t argNumber); |
| |
| void cacheExplicitFormats(UErrorCode& status); |
| |
| int32_t skipLeadingSpaces(UnicodeString& style); |
| |
| Format* createAppropriateFormat(UnicodeString& type, |
| UnicodeString& style, |
| Formattable::Type& formattableType, |
| UParseError& parseError, |
| UErrorCode& ec); |
| |
| const Formattable* getArgFromListByName(const Formattable* arguments, |
| const UnicodeString *argumentNames, |
| int32_t cnt, UnicodeString& name) const; |
| |
| Formattable* parse(int32_t msgStart, |
| const UnicodeString& source, |
| ParsePosition& pos, |
| int32_t& count, |
| UErrorCode& ec) const; |
| |
| FieldPosition* updateMetaData(AppendableWrapper& dest, int32_t prevLength, |
| FieldPosition* fp, const Formattable* argId) const; |
| |
| /** |
| * Finds the "other" sub-message. |
| * @param partIndex the index of the first PluralFormat argument style part. |
| * @return the "other" sub-message start part index. |
| */ |
| int32_t findOtherSubMessage(int32_t partIndex) const; |
| |
| /** |
| * Returns the ARG_START index of the first occurrence of the plural number in a sub-message. |
| * Returns -1 if it is a REPLACE_NUMBER. |
| * Returns 0 if there is neither. |
| */ |
| int32_t findFirstPluralNumberArg(int32_t msgStart, const UnicodeString &argName) const; |
| |
| Format* getCachedFormatter(int32_t argumentNumber) const; |
| |
| UnicodeString getLiteralStringUntilNextArgument(int32_t from) const; |
| |
| void copyObjects(const MessageFormat& that, UErrorCode& ec); |
| |
| void formatComplexSubMessage(int32_t msgStart, |
| const void *plNumber, |
| const Formattable* arguments, |
| const UnicodeString *argumentNames, |
| int32_t cnt, |
| AppendableWrapper& appendTo, |
| UErrorCode& success) const; |
| |
| /** |
| * Convenience method that ought to be in NumberFormat |
| */ |
| NumberFormat* createIntegerFormat(const Locale& locale, UErrorCode& status) const; |
| |
| /** |
| * Returns array of argument types in the parsed pattern |
| * for use in C API. Only for the use of umsg_vformat(). Not |
| * for public consumption. |
| * @param listCount Output parameter to receive the size of array |
| * @return The array of formattable types in the pattern |
| */ |
| const Formattable::Type* getArgTypeList(int32_t& listCount) const { |
| listCount = argTypeCount; |
| return argTypes; |
| } |
| |
| /** |
| * Resets the internal MessagePattern, and other associated caches. |
| */ |
| void resetPattern(); |
| |
| /** |
| * A DummyFormatter that we use solely to store a NULL value. UHash does |
| * not support storing NULL values. |
| */ |
| class U_I18N_API DummyFormat : public Format { |
| public: |
| virtual UBool operator==(const Format&) const; |
| virtual DummyFormat* clone() const; |
| virtual UnicodeString& format(const Formattable& obj, |
| UnicodeString& appendTo, |
| UErrorCode& status) const; |
| virtual UnicodeString& format(const Formattable&, |
| UnicodeString& appendTo, |
| FieldPosition&, |
| UErrorCode& status) const; |
| virtual UnicodeString& format(const Formattable& obj, |
| UnicodeString& appendTo, |
| FieldPositionIterator* posIter, |
| UErrorCode& status) const; |
| virtual void parseObject(const UnicodeString&, |
| Formattable&, |
| ParsePosition&) const; |
| }; |
| |
| friend class MessageFormatAdapter; // getFormatTypeList() access |
| }; |
| |
| U_NAMESPACE_END |
| |
| #endif /* #if !UCONFIG_NO_FORMATTING */ |
| |
| #endif /* U_SHOW_CPLUSPLUS_API */ |
| |
| #endif // _MSGFMT |
| //eof |
