FM / unicode

/usr/include/unicode

Name	Size	Mode	Actions
alphaindex.h	27158	0644	edit dl rm
appendable.h	8739	0644	edit dl rm
basictz.h	10163	0644	edit dl rm
brkiter.h	28478	0644	edit dl rm
bytestream.h	11013	0644	edit dl rm
bytestrie.h	21268	0644	edit dl rm
bytestriebuilder.h	7640	0644	edit dl rm
calendar.h	108424	0644	edit dl rm
caniter.h	7621	0644	edit dl rm
casemap.h	25933	0644	edit dl rm
char16ptr.h	7393	0644	edit dl rm
chariter.h	24638	0644	edit dl rm
choicfmt.h	24544	0644	edit dl rm
coleitr.h	14102	0644	edit dl rm
coll.h	57615	0644	edit dl rm
compactdecimalformat.h	7047	0644	edit dl rm
curramt.h	3869	0644	edit dl rm
currpinf.h	7479	0644	edit dl rm
currunit.h	4112	0644	edit dl rm
datefmt.h	41690	0644	edit dl rm
dbbi.h	1223	0644	edit dl rm
dcfmtsym.h	21101	0644	edit dl rm
decimfmt.h	89676	0644	edit dl rm
docmain.h	7380	0644	edit dl rm
dtfmtsym.h	39126	0644	edit dl rm
dtintrv.h	3935	0644	edit dl rm
dtitvfmt.h	50448	0644	edit dl rm
dtitvinf.h	19072	0644	edit dl rm
dtptngen.h	26692	0644	edit dl rm
dtrule.h	8898	0644	edit dl rm
edits.h	21237	0644	edit dl rm
enumset.h	2130	0644	edit dl rm
errorcode.h	4956	0644	edit dl rm
fieldpos.h	8906	0644	edit dl rm
filteredbrk.h	5501	0644	edit dl rm
fmtable.h	25020	0644	edit dl rm
format.h	12802	0644	edit dl rm
formattedvalue.h	9987	0644	edit dl rm
fpositer.h	3107	0644	edit dl rm
gender.h	3408	0644	edit dl rm
gregocal.h	32642	0644	edit dl rm
icudataver.h	1049	0644	edit dl rm
icuplug.h	12109	0644	edit dl rm
idna.h	13000	0644	edit dl rm
listformatter.h	9004	0644	edit dl rm
localebuilder.h	11350	0644	edit dl rm
localematcher.h	27467	0644	edit dl rm
localpointer.h	19825	0644	edit dl rm
locdspnm.h	7292	0644	edit dl rm
locid.h	48804	0644	edit dl rm
measfmt.h	11690	0644	edit dl rm
measunit.h	107613	0644	edit dl rm
measure.h	4431	0644	edit dl rm
messagepattern.h	34517	0644	edit dl rm
msgfmt.h	45278	0644	edit dl rm
normalizer2.h	34466	0644	edit dl rm
normlzr.h	31690	0644	edit dl rm
nounit.h	2305	0644	edit dl rm
numberformatter.h	94505	0644	edit dl rm
numberrangeformatter.h	25790	0644	edit dl rm
numfmt.h	51034	0644	edit dl rm
numsys.h	7509	0644	edit dl rm
parseerr.h	3155	0644	edit dl rm
parsepos.h	5699	0644	edit dl rm
platform.h	28768	0644	edit dl rm
plurfmt.h	25847	0644	edit dl rm
plurrule.h	21316	0644	edit dl rm
ptypes.h	3577	0644	edit dl rm
putil.h	6471	0644	edit dl rm
rbbi.h	28413	0644	edit dl rm
rbnf.h	50021	0644	edit dl rm
rbtz.h	16210	0644	edit dl rm
regex.h	86385	0644	edit dl rm
region.h	9402	0644	edit dl rm
reldatefmt.h	22751	0644	edit dl rm
rep.h	9599	0644	edit dl rm
resbund.h	18513	0644	edit dl rm
schriter.h	6511	0644	edit dl rm
scientificnumberformatter.h	6589	0644	edit dl rm
search.h	22755	0644	edit dl rm
selfmt.h	14686	0644	edit dl rm
simpleformatter.h	12888	0644	edit dl rm
simpletz.h	46798	0644	edit dl rm
smpdtfmt.h	72778	0644	edit dl rm
sortkey.h	11452	0644	edit dl rm
std_string.h	1076	0644	edit dl rm
strenum.h	10157	0644	edit dl rm
stringoptions.h	5926	0644	edit dl rm
stringpiece.h	10287	0644	edit dl rm
stringtriebuilder.h	15842	0644	edit dl rm
stsearch.h	21926	0644	edit dl rm
symtable.h	4374	0644	edit dl rm
tblcoll.h	37801	0644	edit dl rm
timezone.h	44858	0644	edit dl rm
tmunit.h	3479	0644	edit dl rm
tmutamt.h	5029	0644	edit dl rm
tmutfmt.h	7602	0644	edit dl rm
translit.h	67397	0644	edit dl rm
tzfmt.h	43961	0644	edit dl rm
tznames.h	17251	0644	edit dl rm
tzrule.h	36450	0644	edit dl rm
tztrans.h	6278	0644	edit dl rm
ubidi.h	91759	0644	edit dl rm
ubiditransform.h	13003	0644	edit dl rm
ubrk.h	25043	0644	edit dl rm
ucal.h	62463	0644	edit dl rm
ucasemap.h	15579	0644	edit dl rm
ucat.h	5478	0644	edit dl rm
uchar.h	148111	0644	edit dl rm
ucharstrie.h	23066	0644	edit dl rm
ucharstriebuilder.h	7645	0644	edit dl rm
uchriter.h	13747	0644	edit dl rm
uclean.h	11468	0644	edit dl rm
ucnv.h	85051	0644	edit dl rm
ucnvsel.h	6339	0644	edit dl rm
ucnv_cb.h	6738	0644	edit dl rm
ucnv_err.h	21481	0644	edit dl rm
ucol.h	62987	0644	edit dl rm
ucoleitr.h	10056	0644	edit dl rm
uconfig.h	12356	0644	edit dl rm
ucpmap.h	5663	0644	edit dl rm
ucptrie.h	23044	0644	edit dl rm
ucsdet.h	15043	0644	edit dl rm
ucurr.h	17122	0644	edit dl rm
udat.h	63902	0644	edit dl rm
udata.h	16004	0644	edit dl rm
udateintervalformat.h	12218	0644	edit dl rm
udatpg.h	27405	0644	edit dl rm
udisplaycontext.h	6084	0644	edit dl rm
uenum.h	7981	0644	edit dl rm
ufieldpositer.h	4513	0644	edit dl rm
uformattable.h	11233	0644	edit dl rm
uformattedvalue.h	12600	0644	edit dl rm
ugender.h	2106	0644	edit dl rm
uidna.h	34229	0644	edit dl rm
uiter.h	23299	0644	edit dl rm
uldnames.h	10733	0644	edit dl rm
ulistformatter.h	11043	0644	edit dl rm
uloc.h	55936	0644	edit dl rm
ulocdata.h	11572	0644	edit dl rm
umachine.h	16439	0644	edit dl rm
umisc.h	1365	0644	edit dl rm
umsg.h	24832	0644	edit dl rm
umutablecptrie.h	8490	0644	edit dl rm
unifilt.h	4091	0644	edit dl rm
unifunct.h	4151	0644	edit dl rm
unimatch.h	6244	0644	edit dl rm
unirepl.h	3464	0644	edit dl rm
uniset.h	68108	0644	edit dl rm
unistr.h	174627	0644	edit dl rm
unorm.h	21042	0644	edit dl rm
unorm2.h	25269	0644	edit dl rm
unum.h	56269	0644	edit dl rm
unumberformatter.h	31177	0644	edit dl rm
unumberrangeformatter.h	15737	0644	edit dl rm
unumsys.h	7430	0644	edit dl rm
uobject.h	10934	0644	edit dl rm
upluralrules.h	8997	0644	edit dl rm
uregex.h	73719	0644	edit dl rm
uregion.h	10047	0644	edit dl rm
ureldatefmt.h	17448	0644	edit dl rm
urename.h	137853	0644	edit dl rm
urep.h	5507	0644	edit dl rm
ures.h	37418	0644	edit dl rm
uscript.h	28291	0644	edit dl rm
usearch.h	40153	0644	edit dl rm
uset.h	45503	0644	edit dl rm
usetiter.h	9910	0644	edit dl rm
ushape.h	18430	0644	edit dl rm
uspoof.h	67425	0644	edit dl rm
usprep.h	8382	0644	edit dl rm
ustdio.h	39482	0644	edit dl rm
ustream.h	1934	0644	edit dl rm
ustring.h	74096	0644	edit dl rm
ustringtrie.h	3224	0644	edit dl rm
utext.h	59471	0644	edit dl rm
utf.h	8057	0644	edit dl rm
utf8.h	31572	0644	edit dl rm
utf16.h	23910	0644	edit dl rm
utf32.h	763	0644	edit dl rm
utf_old.h	46929	0644	edit dl rm
utmscale.h	14107	0644	edit dl rm
utrace.h	17595	0644	edit dl rm
utrans.h	26157	0644	edit dl rm
utypes.h	31807	0644	edit dl rm
uvernum.h	6839	0644	edit dl rm
uversion.h	6137	0644	edit dl rm
vtzone.h	21303	0644	edit dl rm

Edit: /usr/include/unicode/msgfmt.h (45278B)

// © 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;

/**
 * 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.
 *
 * A MessageFormat is constructed from a pattern string
 * with arguments in {curly braces} which will be replaced by formatted values.
 *
 * <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.
 *
 * 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()}).
 *
 * 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.
 *
 * An argument might specify a "simple" type for which the specified
 * Format object is created, cached and used.
 *
 * 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.
 *
 * 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.
 *
 * 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).
 *
 * 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 apostrophe 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>
 *
 * Recommendation: Use the real apostrophe (single quote) character
 * \htmlonly&#x2019;\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.
 *
 * 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.
 *
 * 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.
 *
 * <table border=1>
 * <tr>
 * <th>argType
 * <th>argStyle
 * <th>resulting Format object
 * <tr>
 * <td colspan=2>(none)
 * <td><code>null</code>
 * <tr>
 * <td rowspan=6><code>number</code>
 * <td>(none)
 * <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>argStyleText
 * <td><code>new DecimalFormat(argStyleText, new DecimalFormatSymbols(getLocale(), status), status)</code>
 * <tr>
 * <td>argSkeletonText
 * <td><code>NumberFormatter::forSkeleton(argSkeletonText, status).locale(getLocale()).toFormat(status)</code>
 * <tr>
 * <td rowspan=7><code>date</code>
 * <td>(none)
 * <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>argStyleText
 * <td><code>new SimpleDateFormat(argStyleText, getLocale(), status)</code>
 * <tr>
 * <td>argSkeletonText
 * <td><code>DateFormat::createInstanceForSkeleton(argSkeletonText, getLocale(), status)</code>
 * <tr>
 * <td rowspan=6><code>time</code>
 * <td>(none)
 * <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>argStyleText
 * <td><code>new SimpleDateFormat(argStyleText, getLocale(), status)</code>
 * <tr>
 * <td><code>spellout</code>
 * <td>argStyleText (optional)
 * <td><code>new RuleBasedNumberFormat(URBNF_SPELLOUT, getLocale(), status)
 * &nbsp;&nbsp;&nbsp;&nbsp;.setDefaultRuleset(argStyleText, status);</code>
 * <tr>
 * <td><code>ordinal</code>
 * <td>argStyleText (optional)
 * <td><code>new RuleBasedNumberFormat(URBNF_ORDINAL, getLocale(), status)
 * &nbsp;&nbsp;&nbsp;&nbsp;.setDefaultRuleset(argStyleText, status);</code>
 * <tr>
 * <td><code>duration</code>
 * <td>argStyleText (optional)
 * <td><code>new RuleBasedNumberFormat(URBNF_DURATION, getLocale(), status)
 * &nbsp;&nbsp;&nbsp;&nbsp;.setDefaultRuleset(argStyleText, status);</code>
 * </table>
 * 
 *
 * <h4>Argument formatting</h4>
 *
 * Arguments are formatted according to their type, using the default
 * ICU formatters for those types, unless otherwise specified.
 *
 * There are also several ways to control the formatting.
 *
 * We recommend you use default styles, predefined style values, skeletons,
 * or preformatted values, but not pattern strings or custom format objects.
 *
 * For more details, see the
 * <a href="https://unicode-org.github.io/icu/userguide/format_parse/messages">ICU User Guide</a>.
 *
 * <h4>Usage Information</h4>
 *
 * 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.
 *
 * 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>
 *
 *
 * 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
 * output:
 * 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>
 *
 * 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 override;

/**
     * 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 bool operator==(const Format& other) const override;

/**
     * 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>.
 * 
 * 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.
 * The array formatsToAdopt is not itself adopted. 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.
 *
 * 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.
 *
 * 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.
 *
 * 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 pointer 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.
 *
 * 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.
 *
 * 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.
 *
 * 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 override;

/**
     * 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.
 *
 * 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 override;

/**
 * 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.
 *
 * Note 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 override;

/**
 * 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 override;

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 bool operator==(const Format&) const override;
        virtual DummyFormat* clone() const override;
        virtual UnicodeString& format(const Formattable& obj,
                              UnicodeString& appendTo,
                              UErrorCode& status) const;
        virtual UnicodeString& format(const Formattable&,
                                      UnicodeString& appendTo,
                                      FieldPosition&,
                                      UErrorCode& status) const override;
        virtual UnicodeString& format(const Formattable& obj,
                                      UnicodeString& appendTo,
                                      FieldPositionIterator* posIter,
                                      UErrorCode& status) const override;
        virtual void parseObject(const UnicodeString&,
                                 Formattable&,
                                 ParsePosition&) const override;
    };

friend class MessageFormatAdapter; // getFormatTypeList() access
};

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif // _MSGFMT
//eof

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