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ðŸ“„ alphaindex.h(26.54 KB)
ðŸ“„ appendable.h(8.54 KB)
ðŸ“„ basictz.h(9.99 KB)
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ðŸ“„ calendar.h(107.68 KB)
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ðŸ“„ coll.h(56.28 KB)
ðŸ“„ compactdecimalformat.h(6.88 KB)
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ðŸ“„ datefmt.h(40.7 KB)
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ðŸ“„ decimfmt.h(87.46 KB)
ðŸ“„ displayoptions.h(7.08 KB)
ðŸ“„ docmain.h(7.46 KB)
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ðŸ“„ format.h(12.5 KB)
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ðŸ“„ idna.h(12.71 KB)
ðŸ“„ listformatter.h(8.59 KB)
ðŸ“„ localebuilder.h(11.08 KB)
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ðŸ“„ locid.h(48.31 KB)
ðŸ“„ measfmt.h(11.41 KB)
ðŸ“„ measunit.h(108.23 KB)
ðŸ“„ measure.h(4.68 KB)
ðŸ“„ messageformat2.h(18.13 KB)
ðŸ“„ messageformat2_arguments.h(4.3 KB)
ðŸ“„ messageformat2_data_model.h(123 KB)
ðŸ“„ messageformat2_data_model_names.h(784 B)
ðŸ“„ messageformat2_formattable.h(38.29 KB)
ðŸ“„ messageformat2_function_registry.h(18 KB)
ðŸ“„ messagepattern.h(33.72 KB)
ðŸ“„ msgfmt.h(44.2 KB)
ðŸ“„ normalizer2.h(34.73 KB)
ðŸ“„ normlzr.h(30.79 KB)
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ðŸ“„ numberformatter.h(90.74 KB)
ðŸ“„ numberrangeformatter.h(26.05 KB)
ðŸ“„ numfmt.h(50.16 KB)
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ðŸ“„ parseerr.h(3.08 KB)
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ðŸ“„ platform.h(26.66 KB)
ðŸ“„ plurfmt.h(25.07 KB)
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ðŸ“„ reldatefmt.h(22.36 KB)
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ðŸ“„ scientificnumberformatter.h(6.44 KB)
ðŸ“„ search.h(22.21 KB)
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ðŸ“„ simpleformatter.h(12.58 KB)
ðŸ“„ simplenumberformatter.h(9.18 KB)
ðŸ“„ simpletz.h(45.62 KB)
ðŸ“„ smpdtfmt.h(57.06 KB)
ðŸ“„ sortkey.h(11.12 KB)
ðŸ“„ std_string.h(1.05 KB)
ðŸ“„ strenum.h(9.96 KB)
ðŸ“„ stringoptions.h(5.79 KB)
ðŸ“„ stringpiece.h(10.02 KB)
ðŸ“„ stringtriebuilder.h(15.5 KB)
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ðŸ“„ symtable.h(4.28 KB)
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ðŸ“„ timezone.h(45.64 KB)
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ðŸ“„ translit.h(65.8 KB)
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ðŸ“„ ubidi.h(89.61 KB)
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ðŸ“„ uconfig.h(12.56 KB)
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ðŸ“„ ucptrie.h(22.51 KB)
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ðŸ“„ udat.h(62.36 KB)
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ðŸ“„ udateintervalformat.h(11.93 KB)
ðŸ“„ udatpg.h(30.13 KB)
ðŸ“„ udisplaycontext.h(5.94 KB)
ðŸ“„ udisplayoptions.h(8.86 KB)
ðŸ“„ uenum.h(7.79 KB)
ðŸ“„ ufieldpositer.h(4.41 KB)
ðŸ“„ uformattable.h(10.97 KB)
ðŸ“„ uformattednumber.h(8.09 KB)
ðŸ“„ uformattedvalue.h(12.25 KB)
ðŸ“„ ugender.h(2.06 KB)
ðŸ“„ uidna.h(33.43 KB)
ðŸ“„ uiter.h(22.75 KB)
ðŸ“„ uldnames.h(10.48 KB)
ðŸ“„ ulistformatter.h(10.78 KB)
ðŸ“„ uloc.h(55.38 KB)
ðŸ“„ ulocale.h(6.35 KB)
ðŸ“„ ulocbuilder.h(16.73 KB)
ðŸ“„ ulocdata.h(11.3 KB)
ðŸ“„ umachine.h(14.59 KB)
ðŸ“„ umisc.h(1.34 KB)
ðŸ“„ umsg.h(24.25 KB)
ðŸ“„ umutablecptrie.h(8.3 KB)
ðŸ“„ unifilt.h(4 KB)
ðŸ“„ unifunct.h(4.05 KB)
ðŸ“„ unimatch.h(6.1 KB)
ðŸ“„ unirepl.h(3.38 KB)
ðŸ“„ uniset.h(66.82 KB)
ðŸ“„ unistr.h(171.33 KB)
ðŸ“„ unorm.h(20.55 KB)
ðŸ“„ unorm2.h(25.71 KB)
ðŸ“„ unum.h(55.16 KB)
ðŸ“„ unumberformatter.h(19.68 KB)
ðŸ“„ unumberoptions.h(5.23 KB)
ðŸ“„ unumberrangeformatter.h(15.35 KB)
ðŸ“„ unumsys.h(7.26 KB)
ðŸ“„ uobject.h(10.66 KB)
ðŸ“„ upluralrules.h(8.79 KB)
ðŸ“„ uregex.h(71.99 KB)
ðŸ“„ uregion.h(9.81 KB)
ðŸ“„ ureldatefmt.h(16.98 KB)
ðŸ“„ urename.h(141.31 KB)
ðŸ“„ urep.h(5.38 KB)
ðŸ“„ ures.h(36.65 KB)
ðŸ“„ uscript.h(27.89 KB)
ðŸ“„ usearch.h(39.21 KB)
ðŸ“„ uset.h(45.56 KB)
ðŸ“„ usetiter.h(9.63 KB)
ðŸ“„ ushape.h(18 KB)
ðŸ“„ usimplenumberformatter.h(7.63 KB)
ðŸ“„ uspoof.h(80.32 KB)
ðŸ“„ usprep.h(8.19 KB)
ðŸ“„ ustdio.h(38.56 KB)
ðŸ“„ ustream.h(1.89 KB)
ðŸ“„ ustring.h(72.13 KB)
ðŸ“„ ustringtrie.h(3.15 KB)
ðŸ“„ utext.h(58.1 KB)
ðŸ“„ utf.h(7.87 KB)
ðŸ“„ utf16.h(23.35 KB)
ðŸ“„ utf32.h(763 B)
ðŸ“„ utf8.h(30.83 KB)
ðŸ“„ utf_old.h(45.8 KB)
ðŸ“„ utmscale.h(13.78 KB)
ðŸ“„ utrace.h(17.18 KB)
ðŸ“„ utrans.h(25.54 KB)
ðŸ“„ utypes.h(33.71 KB)
ðŸ“„ uvernum.h(6.33 KB)
ðŸ“„ uversion.h(5.99 KB)
ðŸ“„ vtzone.h(20.68 KB)

Editing: messageformat2.h

// © 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_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/unistr.h"

#ifndef U_HIDE_DEPRECATED_API

U_NAMESPACE_BEGIN

namespace message2 {

class Environment;
    class MessageContext;
    class ResolvedSelector;
    class StaticErrors;

/**
     * <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;

/**
         * 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;

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);
            /**
             * 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 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;

ResolvedSelector resolveVariables(const Environment& env, const data_model::Operand&, MessageContext&, UErrorCode &) const;
        ResolvedSelector resolveVariables(const Environment& env, const data_model::Expression&, MessageContext&, UErrorCode &) const;

// 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&, ResolvedSelector&& 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
        [[nodiscard]] FormattedPlaceholder formatLiteral(const data_model::Literal&) const;
        void formatPattern(MessageContext&, const Environment&, const data_model::Pattern&, UErrorCode&, UnicodeString&) const;
        // Formats a call to a formatting function
        // Dispatches on argument type
        [[nodiscard]] FormattedPlaceholder evalFormatterCall(FormattedPlaceholder&& argument,
                                                       MessageContext& context,
                                                       UErrorCode& status) const;
        // Dispatches on function name
        [[nodiscard]] FormattedPlaceholder evalFormatterCall(const FunctionName& functionName,
                                                       FormattedPlaceholder&& argument,
                                                       FunctionOptions&& options,
                                                       MessageContext& context,
                                                       UErrorCode& status) const;
        // Formats an expression that appears as a selector
        ResolvedSelector formatSelectorExpression(const Environment& env, const data_model::Expression&, MessageContext&, UErrorCode&) const;
        // Formats an expression that appears in a pattern or as the definition of a local variable
        [[nodiscard]] FormattedPlaceholder formatExpression(const Environment&, const data_model::Expression&, MessageContext&, UErrorCode&) const;
        [[nodiscard]] FunctionOptions resolveOptions(const Environment& env, const OptionMap&, MessageContext&, UErrorCode&) const;
        [[nodiscard]] FormattedPlaceholder 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;

}; // class MessageFormatter

} // namespace message2

U_NAMESPACE_END

#endif // U_HIDE_DEPRECATED_API

#endif /* #if !UCONFIG_NO_MF2 */

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif /* U_SHOW_CPLUSPLUS_API */

#endif // MESSAGEFORMAT2_H

// eof

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