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alphaindex.h
26.54
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appendable.h
8.54
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basictz.h
9.99
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brkiter.h
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bytestream.h
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bytestrie.h
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bytestriebuilder.h
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calendar.h
107.54
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caniter.h
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casemap.h
25.42
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char16ptr.h
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chariter.h
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choicfmt.h
23.99
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coleitr.h
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coll.h
59.6
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compactdecimalformat.h
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curramt.h
3.67
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currpinf.h
7.3
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currunit.h
4.02
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datefmt.h
40.7
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dbbi.h
1.19
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dcfmtsym.h
20.96
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decimfmt.h
87.46
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displayoptions.h
7.08
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docmain.h
7.6
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dtfmtsym.h
38.22
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dtintrv.h
3.84
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dtitvfmt.h
48.87
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dtitvinf.h
18.63
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dtptngen.h
28.05
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dtrule.h
8.66
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edits.h
20.74
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enumset.h
2.08
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errorcode.h
4.84
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fieldpos.h
8.69
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filteredbrk.h
5.37
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fmtable.h
24.37
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format.h
12.51
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formattednumber.h
6.28
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formattedvalue.h
9.75
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fpositer.h
3.03
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gender.h
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gregocal.h
30.32
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icudataver.h
1.02
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icuplug.h
12.1
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idna.h
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listformatter.h
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localebuilder.h
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localematcher.h
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localpointer.h
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locdspnm.h
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locid.h
48.62
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measfmt.h
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measunit.h
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measure.h
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messageformat2.h
21.05
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messageformat2_arguments.h
4.49
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messageformat2_data_model.h
101.89
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messageformat2_data_model_names.h
784
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messageformat2_formattable.h
38.36
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messageformat2_function_registry.h
18.07
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messagepattern.h
33.79
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msgfmt.h
44.2
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normalizer2.h
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normlzr.h
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nounit.h
2.24
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numberformatter.h
90.69
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numberrangeformatter.h
26
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numfmt.h
50.16
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numsys.h
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parseerr.h
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parsepos.h
5.56
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platform.h
27.18
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plurfmt.h
25.07
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plurrule.h
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ptypes.h
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putil.h
6.32
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rbbi.h
32.04
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rbnf.h
56.16
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rbtz.h
15.75
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regex.h
84.45
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region.h
9.2
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reldatefmt.h
22.48
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rep.h
9.38
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resbund.h
18.02
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schriter.h
6.09
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scientificnumberformatter.h
6.44
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search.h
22.21
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selfmt.h
14.35
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simpleformatter.h
12.6
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simplenumberformatter.h
8.87
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simpletz.h
45.62
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smpdtfmt.h
57.06
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sortkey.h
11.13
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std_string.h
1.05
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strenum.h
9.96
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stringoptions.h
5.79
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stringpiece.h
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stringtriebuilder.h
15.53
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stsearch.h
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symtable.h
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tblcoll.h
36.96
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timezone.h
45.59
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tmunit.h
3.4
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tmutamt.h
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tmutfmt.h
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translit.h
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tzfmt.h
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tznames.h
16.85
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tzrule.h
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tztrans.h
6.11
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ubidi.h
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ubiditransform.h
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ubrk.h
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ucal.h
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ucasemap.h
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ucat.h
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uchar.h
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ucharstrie.h
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ucharstriebuilder.h
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uchriter.h
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uclean.h
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ucnv.h
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ucnv_cb.h
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ucnv_err.h
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ucnvsel.h
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ucol.h
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ucoleitr.h
9.82
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uconfig.h
12.56
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ucpmap.h
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ucptrie.h
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udat.h
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udata.h
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udateintervalformat.h
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ufieldpositer.h
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uformattable.h
10.97
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uformattednumber.h
8.09
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uformattedvalue.h
12.25
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ugender.h
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uidna.h
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uiter.h
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uldnames.h
10.48
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ulistformatter.h
10.78
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uloc.h
55.38
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ulocale.h
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ulocbuilder.h
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umachine.h
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umsg.h
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umutablecptrie.h
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unifilt.h
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unifunct.h
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unimatch.h
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uniset.h
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unistr.h
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unorm.h
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unorm2.h
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unum.h
55.16
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unumberformatter.h
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unumberoptions.h
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unumberrangeformatter.h
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unumsys.h
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uobject.h
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upluralrules.h
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uregex.h
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uregion.h
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ureldatefmt.h
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urename.h
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urep.h
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ures.h
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uscript.h
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usearch.h
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uset.h
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ushape.h
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utext.h
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utf.h
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utf16.h
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utf_old.h
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utrans.h
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utypes.h
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uvernum.h
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uversion.h
8.21
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vtzone.h
20.68
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2025-07-11 14:03
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// © 2024 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html #include "unicode/utypes.h" #ifndef MESSAGEFORMAT2_H #define MESSAGEFORMAT2_H #if U_SHOW_CPLUSPLUS_API #if !UCONFIG_NO_NORMALIZATION #if !UCONFIG_NO_FORMATTING #if !UCONFIG_NO_MF2 /** * \file * \brief C++ API: Formats messages using the draft MessageFormat 2.0. */ #include "unicode/messageformat2_arguments.h" #include "unicode/messageformat2_data_model.h" #include "unicode/messageformat2_function_registry.h" #include "unicode/normalizer2.h" #include "unicode/unistr.h" #ifndef U_HIDE_DEPRECATED_API U_NAMESPACE_BEGIN namespace message2 { class Environment; class MessageContext; class StaticErrors; class InternalValue; /** * <p>MessageFormatter is a Technical Preview API implementing MessageFormat 2.0. * * <p>See <a target="github" href="https://github.com/unicode-org/message-format-wg/blob/main/spec/syntax.md">the * description of the syntax with examples and use cases</a> and the corresponding * <a target="github" href="https://github.com/unicode-org/message-format-wg/blob/main/spec/message.abnf">ABNF</a> grammar.</p> * * The MessageFormatter class is mutable and movable. It is not copyable. * (It is mutable because if it has a custom function registry, the registry may include * `FormatterFactory` objects implementing custom formatters, which are allowed to contain * mutable state.) * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ class U_I18N_API MessageFormatter : public UObject { // Note: This class does not currently inherit from the existing // `Format` class. public: /** * Move assignment operator: * The source MessageFormatter will be left in a valid but undefined state. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ MessageFormatter& operator=(MessageFormatter&&) noexcept; /** * Destructor. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ virtual ~MessageFormatter(); /** * Formats the message to a string, using the data model that was previously set or parsed, * and the given `arguments` object. * * @param arguments Reference to message arguments * @param status Input/output error code used to indicate syntax errors, data model * errors, resolution errors, formatting errors, selection errors, as well * as other errors (such as memory allocation failures). Partial output * is still provided in the presence of most error types. * @return The string result of formatting the message with the given arguments. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ UnicodeString formatToString(const MessageArguments& arguments, UErrorCode &status); /** * Not yet implemented; formats the message to a `FormattedMessage` object, * using the data model that was previously set or parsed, * and the given `arguments` object. * * @param arguments Reference to message arguments * @param status Input/output error code used to indicate syntax errors, data model * errors, resolution errors, formatting errors, selection errors, as well * as other errors (such as memory allocation failures). Partial output * is still provided in the presence of most error types. * @return The `FormattedMessage` representing the formatted message. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ FormattedMessage format(const MessageArguments& arguments, UErrorCode &status) const { (void) arguments; if (U_SUCCESS(status)) { status = U_UNSUPPORTED_ERROR; } return FormattedMessage(status); } /** * Accesses the locale that this `MessageFormatter` object was created with. * * @return A reference to the locale. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ const Locale& getLocale() const { return locale; } /** * Serializes the data model as a string in MessageFormat 2.0 syntax. * * @return result A string representation of the data model. * The string is a valid MessageFormat 2.0 message. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ UnicodeString getPattern() const; /** * Accesses the data model referred to by this * `MessageFormatter` object. * * @return A reference to the data model. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ const MFDataModel& getDataModel() const; /** * Used in conjunction with the * MessageFormatter::Builder::setErrorHandlingBehavior() method. * * @internal ICU 76 technology preview * @deprecated This API is for technology preview only. */ typedef enum UMFErrorHandlingBehavior { /** * Suppress errors and return best-effort output. * * @internal ICU 76 technology preview * @deprecated This API is for technology preview only. */ U_MF_BEST_EFFORT = 0, /** * Signal all MessageFormat errors using the UErrorCode * argument. * * @internal ICU 76 technology preview * @deprecated This API is for technology preview only. */ U_MF_STRICT } UMFErrorHandlingBehavior; /** * The mutable Builder class allows each part of the MessageFormatter to be initialized * separately; calling its `build()` method yields an immutable MessageFormatter. * * Not copyable or movable. */ class U_I18N_API Builder : public UObject { private: friend class MessageFormatter; // The pattern to be parsed to generate the formatted message UnicodeString pattern; bool hasPattern = false; bool hasDataModel = false; // The data model to be used to generate the formatted message // Initialized either by `setDataModel()`, or by the parser // through a call to `setPattern()` MFDataModel dataModel; // Normalized representation of the pattern; // ignored if `setPattern()` wasn't called UnicodeString normalizedInput; // Errors (internal representation of parse errors) // Ignored if `setPattern()` wasn't called StaticErrors* errors; Locale locale; // Not owned const MFFunctionRegistry* customMFFunctionRegistry; // Error behavior; see comment in `MessageFormatter` class bool signalErrors = false; void clearState(); public: /** * Sets the locale to use for formatting. * * @param locale The desired locale. * @return A reference to the builder. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ Builder& setLocale(const Locale& locale); /** * Sets the pattern (contents of the message) and parses it * into a data model. If a data model was * previously set, it is removed. * * @param pattern A string in MessageFormat 2.0 syntax. * @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. * @return A reference to the builder. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ Builder& setPattern(const UnicodeString& pattern, UParseError& parseError, UErrorCode& status); /** * Sets a custom function registry. * * @param functionRegistry Reference to the function registry to use. * `functionRegistry` is not copied, * and the caller must ensure its lifetime contains * the lifetime of the `MessageFormatter` object built by this * builder. * @return A reference to the builder. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ Builder& setFunctionRegistry(const MFFunctionRegistry& functionRegistry); /** * Sets a data model. If a pattern was previously set, it is removed. * * @param dataModel Data model to format. Passed by move. * @return A reference to the builder. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ Builder& setDataModel(MFDataModel&& dataModel); /** * Set the error handling behavior for this formatter. * * "Strict" error behavior means that that formatting methods * will set their UErrorCode arguments to signal MessageFormat * data model, resolution, and runtime errors. Syntax errors are * always signaled. * * "Best effort" error behavior means that MessageFormat errors are * suppressed: formatting methods will _not_ set their * UErrorCode arguments to signal MessageFormat data model, * resolution, or runtime errors. Best-effort output * will be returned. Syntax errors are always signaled. * This is the default behavior. * * @param type An enum with type UMFErrorHandlingBehavior; * if type == `U_MF_STRICT`, then * errors are handled strictly. * If type == `U_MF_BEST_EFFORT`, then * best-effort output is returned. * * The default is to suppress all MessageFormat errors * and return best-effort output. * * @return A reference to the builder. * * @internal ICU 76 technology preview * @deprecated This API is for technology preview only. */ Builder& setErrorHandlingBehavior(UMFErrorHandlingBehavior type); /** * Constructs a new immutable MessageFormatter using the pattern or data model * that was previously set, and the locale (if it was previously set) * or default locale (otherwise). * * The builder object (`this`) can still be used after calling `build()`. * * @param status Input/output error code. If neither the pattern * nor the data model is set, set to failure code. * @return The new MessageFormatter object * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ MessageFormatter build(UErrorCode& status) const; /** * Default constructor. * Returns a Builder with the default locale and with no * data model or pattern set. Either `setPattern()` * or `setDataModel()` has to be called before calling `build()`. * * @param status Input/output error code. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ Builder(UErrorCode& status); /** * Destructor. * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ virtual ~Builder(); }; // class MessageFormatter::Builder // TODO: Shouldn't be public; only used for testing /** * Returns a string consisting of the input with optional spaces removed. * * @return A normalized string representation of the input * * @internal ICU 75 technology preview * @deprecated This API is for technology preview only. */ const UnicodeString& getNormalizedPattern() const { return normalizedInput; } private: friend class Builder; friend class Checker; friend class MessageArguments; friend class MessageContext; MessageFormatter(const MessageFormatter::Builder& builder, UErrorCode &status); MessageFormatter() = delete; // default constructor not implemented // Do not define default assignment operator const MessageFormatter &operator=(const MessageFormatter &) = delete; // Selection methods // Takes a vector of FormattedPlaceholders void resolveSelectors(MessageContext&, const Environment& env, UErrorCode&, UVector&) const; // Takes a vector of vectors of strings (input) and a vector of PrioritizedVariants (output) void filterVariants(const UVector&, UVector&, UErrorCode&) const; // Takes a vector of vectors of strings (input) and a vector of PrioritizedVariants (input/output) void sortVariants(const UVector&, UVector&, UErrorCode&) const; // Takes a vector of strings (input) and a vector of strings (output) void matchSelectorKeys(const UVector&, MessageContext&, InternalValue* rv, UVector&, UErrorCode&) const; // Takes a vector of FormattedPlaceholders (input), // and a vector of vectors of strings (output) void resolvePreferences(MessageContext&, UVector&, UVector&, UErrorCode&) const; // Formatting methods // Used for normalizing variable names and keys for comparison UnicodeString normalizeNFC(const UnicodeString&) const; [[nodiscard]] FormattedPlaceholder formatLiteral(const data_model::Literal&) const; void formatPattern(MessageContext&, const Environment&, const data_model::Pattern&, UErrorCode&, UnicodeString&) const; // Evaluates a function call // Dispatches on argument type [[nodiscard]] InternalValue* evalFunctionCall(FormattedPlaceholder&& argument, MessageContext& context, UErrorCode& status) const; // Dispatches on function name [[nodiscard]] InternalValue* evalFunctionCall(const FunctionName& functionName, InternalValue* argument, FunctionOptions&& options, MessageContext& context, UErrorCode& status) const; // Formats an expression that appears in a pattern or as the definition of a local variable [[nodiscard]] InternalValue* formatExpression(const Environment&, const data_model::Expression&, MessageContext&, UErrorCode&) const; [[nodiscard]] FunctionOptions resolveOptions(const Environment& env, const OptionMap&, MessageContext&, UErrorCode&) const; [[nodiscard]] InternalValue* formatOperand(const Environment&, const data_model::Operand&, MessageContext&, UErrorCode&) const; [[nodiscard]] FormattedPlaceholder evalArgument(const data_model::VariableName&, MessageContext&, UErrorCode&) const; void formatSelectors(MessageContext& context, const Environment& env, UErrorCode &status, UnicodeString& result) const; // Function registry methods bool hasCustomMFFunctionRegistry() const { return (customMFFunctionRegistry != nullptr); } // Precondition: custom function registry exists // Note: this is non-const because the values in the MFFunctionRegistry are mutable // (a FormatterFactory can have mutable state) const MFFunctionRegistry& getCustomMFFunctionRegistry() const; bool isCustomFormatter(const FunctionName&) const; FormatterFactory* lookupFormatterFactory(const FunctionName&, UErrorCode& status) const; bool isBuiltInSelector(const FunctionName&) const; bool isBuiltInFormatter(const FunctionName&) const; bool isCustomSelector(const FunctionName&) const; const SelectorFactory* lookupSelectorFactory(MessageContext&, const FunctionName&, UErrorCode&) const; bool isSelector(const FunctionName& fn) const { return isBuiltInSelector(fn) || isCustomSelector(fn); } bool isFormatter(const FunctionName& fn) const { return isBuiltInFormatter(fn) || isCustomFormatter(fn); } const Formatter* lookupFormatter(const FunctionName&, UErrorCode&) const; Selector* getSelector(MessageContext&, const FunctionName&, UErrorCode&) const; Formatter* getFormatter(const FunctionName&, UErrorCode&) const; bool getDefaultFormatterNameByType(const UnicodeString&, FunctionName&) const; // Checking for resolution errors void checkDeclarations(MessageContext&, Environment*&, UErrorCode&) const; void check(MessageContext&, const Environment&, const data_model::Expression&, UErrorCode&) const; void check(MessageContext&, const Environment&, const data_model::Operand&, UErrorCode&) const; void check(MessageContext&, const Environment&, const OptionMap&, UErrorCode&) const; void initErrors(UErrorCode&); void clearErrors() const; void cleanup() noexcept; // The locale this MessageFormatter was created with /* const */ Locale locale; // Registry for built-in functions MFFunctionRegistry standardMFFunctionRegistry; // Registry for custom functions; may be null if no custom registry supplied // Note: this is *not* owned by the MessageFormatter object // The reason for this choice is to have a non-destructive MessageFormatter::Builder, // while also not requiring the function registry to be deeply-copyable. Making the // function registry copyable would impose a requirement on any implementations // of the FormatterFactory and SelectorFactory interfaces to implement a custom // clone() method, which is necessary to avoid sharing between copies of the // function registry (and thus double-frees) // Not deeply immutable (the values in the function registry are mutable, // as a FormatterFactory can have mutable state const MFFunctionRegistry* customMFFunctionRegistry; // Data model, representing the parsed message MFDataModel dataModel; // Normalized version of the input string (optional whitespace removed) UnicodeString normalizedInput; // Errors -- only used while parsing and checking for data model errors; then // the MessageContext keeps track of errors // Must be a raw pointer to avoid including the internal header file // defining StaticErrors // Owned by `this` StaticErrors* errors = nullptr; // Error handling behavior. // If true, then formatting methods set their UErrorCode arguments // to signal MessageFormat errors, and no useful output is returned. // If false, then MessageFormat errors are not signaled and the // formatting methods return best-effort output. // The default is false. bool signalErrors = false; // Used for implementing normalizeNFC() const Normalizer2* nfcNormalizer = nullptr; }; // class MessageFormatter } // namespace message2 U_NAMESPACE_END #endif // U_HIDE_DEPRECATED_API #endif /* #if !UCONFIG_NO_MF2 */ #endif /* #if !UCONFIG_NO_FORMATTING */ #endif /* #if !UCONFIG_NO_NORMALIZATION */ #endif /* U_SHOW_CPLUSPLUS_API */ #endif // MESSAGEFORMAT2_H // eof