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ref:cde9a383711a11544ce7e107a78147fb96cc4029

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diff --git a/contrib/libs/icu/include/unicode/tznames.h b/contrib/libs/icu/include/unicode/tznames.h
new file mode 100644
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+++ b/contrib/libs/icu/include/unicode/tznames.h
@@ -0,0 +1,419 @@
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2011-2016, International Business Machines Corporation and
+* others. All Rights Reserved.
+*******************************************************************************
+*/
+#ifndef __TZNAMES_H
+#define __TZNAMES_H
+
+/**
+ * \file
+ * \brief C++ API: TimeZoneNames
+ */
+#include "unicode/utypes.h"
+
+#if U_SHOW_CPLUSPLUS_API
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/uloc.h"
+#include "unicode/unistr.h"
+
+U_CDECL_BEGIN
+
+/**
+ * Constants for time zone display name types.
+ * @stable ICU 50
+ */
+typedef enum UTimeZoneNameType {
+    /**
+     * Unknown display name type.
+     * @stable ICU 50
+     */
+    UTZNM_UNKNOWN           = 0x00,
+    /**
+     * Long display name, such as "Eastern Time".
+     * @stable ICU 50
+     */
+    UTZNM_LONG_GENERIC      = 0x01,
+    /**
+     * Long display name for standard time, such as "Eastern Standard Time".
+     * @stable ICU 50
+     */
+    UTZNM_LONG_STANDARD     = 0x02,
+    /**
+     * Long display name for daylight saving time, such as "Eastern Daylight Time".
+     * @stable ICU 50
+     */
+    UTZNM_LONG_DAYLIGHT     = 0x04,
+    /**
+     * Short display name, such as "ET".
+     * @stable ICU 50
+     */
+    UTZNM_SHORT_GENERIC     = 0x08,
+    /**
+     * Short display name for standard time, such as "EST".
+     * @stable ICU 50
+     */
+    UTZNM_SHORT_STANDARD    = 0x10,
+    /**
+     * Short display name for daylight saving time, such as "EDT".
+     * @stable ICU 50
+     */
+    UTZNM_SHORT_DAYLIGHT    = 0x20,
+    /**
+     * Exemplar location name, such as "Los Angeles".
+     * @stable ICU 51
+     */
+    UTZNM_EXEMPLAR_LOCATION = 0x40
+} UTimeZoneNameType;
+
+U_CDECL_END
+
+U_NAMESPACE_BEGIN
+
+class UVector;
+struct MatchInfo;
+
+/**
+ * <code>TimeZoneNames</code> is an abstract class representing the time zone display name data model defined
+ * by <a href="http://www.unicode.org/reports/tr35/">UTS#35 Unicode Locale Data Markup Language (LDML)</a>.
+ * The model defines meta zone, which is used for storing a set of display names. A meta zone can be shared
+ * by multiple time zones. Also a time zone may have multiple meta zone historic mappings.
+ * <p>
+ * For example, people in the United States refer the zone used by the east part of North America as "Eastern Time".
+ * The tz database contains multiple time zones "America/New_York", "America/Detroit", "America/Montreal" and some
+ * others that belong to "Eastern Time". However, assigning different display names to these time zones does not make
+ * much sense for most of people.
+ * <p>
+ * In <a href="http://cldr.unicode.org/">CLDR</a> (which uses LDML for representing locale data), the display name
+ * "Eastern Time" is stored as long generic display name of a meta zone identified by the ID "America_Eastern".
+ * Then, there is another table maintaining the historic mapping to meta zones for each time zone. The time zones in
+ * the above example ("America/New_York", "America/Detroit"...) are mapped to the meta zone "America_Eastern".
+ * <p>
+ * Sometimes, a time zone is mapped to a different time zone in the past. For example, "America/Indiana/Knox"
+ * had been moving "Eastern Time" and "Central Time" back and forth. Therefore, it is necessary that time zone
+ * to meta zones mapping data are stored by date range.
+ *
+ * <p><b>Note:</b>
+ * The methods in this class assume that time zone IDs are already canonicalized. For example, you may not get proper
+ * result returned by a method with time zone ID "America/Indiana/Indianapolis", because it's not a canonical time zone
+ * ID (the canonical time zone ID for the time zone is "America/Indianapolis". See
+ * {@link TimeZone#getCanonicalID(const UnicodeString& id, UnicodeString& canonicalID, UErrorCode& status)} about ICU
+ * canonical time zone IDs.
+ *
+ * <p>
+ * In CLDR, most of time zone display names except location names are provided through meta zones. But a time zone may
+ * have a specific name that is not shared with other time zones.
+ *
+ * For example, time zone "Europe/London" has English long name for standard time "Greenwich Mean Time", which is also
+ * shared with other time zones. However, the long name for daylight saving time is "British Summer Time", which is only
+ * used for "Europe/London".
+ *
+ * <p>
+ * {@link #getTimeZoneDisplayName} is designed for accessing a name only used by a single time zone.
+ * But is not necessarily mean that a subclass implementation use the same model with CLDR. A subclass implementation
+ * may provide time zone names only through {@link #getTimeZoneDisplayName}, or only through {@link #getMetaZoneDisplayName},
+ * or both.
+ *
+ * <p>
+ * The default <code>TimeZoneNames</code> implementation returned by {@link #createInstance}
+ * uses the locale data imported from CLDR. In CLDR, set of meta zone IDs and mappings between zone IDs and meta zone
+ * IDs are shared by all locales. Therefore, the behavior of {@link #getAvailableMetaZoneIDs},
+ * {@link #getMetaZoneID}, and {@link #getReferenceZoneID} won't be changed no matter
+ * what locale is used for getting an instance of <code>TimeZoneNames</code>.
+ *
+ * @stable ICU 50
+ */
+class U_I18N_API TimeZoneNames : public UObject {
+public:
+    /**
+     * Destructor.
+     * @stable ICU 50
+     */
+    virtual ~TimeZoneNames();
+
+    /**
+     * Return true if the given TimeZoneNames objects are semantically equal.
+     * @param other the object to be compared with.
+     * @return Return TRUE if the given Format objects are semantically equal.
+     * @stable ICU 50
+     */
+    virtual UBool operator==(const TimeZoneNames& other) const = 0;
+
+    /**
+     * Return true if the given TimeZoneNames objects are not semantically
+     * equal.
+     * @param other the object to be compared with.
+     * @return Return TRUE if the given Format objects are not semantically equal.
+     * @stable ICU 50
+     */
+    UBool operator!=(const TimeZoneNames& other) const { return !operator==(other); }
+
+    /**
+     * Clone this object polymorphically.  The caller is responsible
+     * for deleting the result when done.
+     * @return A copy of the object
+     * @stable ICU 50
+     */
+    virtual TimeZoneNames* clone() const = 0;
+
+    /**
+     * Returns an instance of <code>TimeZoneNames</code> for the specified locale.
+     *
+     * @param locale The locale.
+     * @param status Receives the status.
+     * @return An instance of <code>TimeZoneNames</code>
+     * @stable ICU 50
+     */
+    static TimeZoneNames* U_EXPORT2 createInstance(const Locale& locale, UErrorCode& status);
+
+    /**
+     * Returns an instance of <code>TimeZoneNames</code> containing only short specific
+     * zone names (SHORT_STANDARD and SHORT_DAYLIGHT),
+     * compatible with the IANA tz database's zone abbreviations (not localized).
+     * <br>
+     * Note: The input locale is used for resolving ambiguous names (e.g. "IST" is parsed
+     * as Israel Standard Time for Israel, while it is parsed as India Standard Time for
+     * all other regions). The zone names returned by this instance are not localized.
+     * @stable ICU 54
+     */
+     static TimeZoneNames* U_EXPORT2 createTZDBInstance(const Locale& locale, UErrorCode& status);
+
+    /**
+     * Returns an enumeration of all available meta zone IDs.
+     * @param status Receives the status.
+     * @return an enumeration object, owned by the caller.
+     * @stable ICU 50
+     */
+    virtual StringEnumeration* getAvailableMetaZoneIDs(UErrorCode& status) const = 0;
+
+    /**
+     * Returns an enumeration of all available meta zone IDs used by the given time zone.
+     * @param tzID The canoical tiem zone ID.
+     * @param status Receives the status.
+     * @return an enumeration object, owned by the caller.
+     * @stable ICU 50
+     */
+    virtual StringEnumeration* getAvailableMetaZoneIDs(const UnicodeString& tzID, UErrorCode& status) const = 0;
+
+    /**
+     * Returns the meta zone ID for the given canonical time zone ID at the given date.
+     * @param tzID The canonical time zone ID.
+     * @param date The date.
+     * @param mzID Receives the meta zone ID for the given time zone ID at the given date. If the time zone does not have a
+     *          corresponding meta zone at the given date or the implementation does not support meta zones, "bogus" state
+     *          is set.
+     * @return A reference to the result.
+     * @stable ICU 50
+     */
+    virtual UnicodeString& getMetaZoneID(const UnicodeString& tzID, UDate date, UnicodeString& mzID) const = 0;
+
+    /**
+     * Returns the reference zone ID for the given meta zone ID for the region.
+     *
+     * Note: Each meta zone must have a reference zone associated with a special region "001" (world).
+     * Some meta zones may have region specific reference zone IDs other than the special region
+     * "001". When a meta zone does not have any region specific reference zone IDs, this method
+     * return the reference zone ID for the special region "001" (world).
+     *
+     * @param mzID The meta zone ID.
+     * @param region The region.
+     * @param tzID Receives the reference zone ID ("golden zone" in the LDML specification) for the given time zone ID for the
+     *          region. If the meta zone is unknown or the implementation does not support meta zones, "bogus" state
+     *          is set.
+     * @return A reference to the result.
+     * @stable ICU 50
+     */
+    virtual UnicodeString& getReferenceZoneID(const UnicodeString& mzID, const char* region, UnicodeString& tzID) const = 0;
+
+    /**
+     * Returns the display name of the meta zone.
+     * @param mzID The meta zone ID.
+     * @param type The display name type. See {@link #UTimeZoneNameType}.
+     * @param name Receives the display name of the meta zone. When this object does not have a localized display name for the given
+     *         meta zone with the specified type or the implementation does not provide any display names associated
+     *         with meta zones, "bogus" state is set.
+     * @return A reference to the result.
+     * @stable ICU 50
+     */
+    virtual UnicodeString& getMetaZoneDisplayName(const UnicodeString& mzID, UTimeZoneNameType type, UnicodeString& name) const = 0;
+
+    /**
+     * Returns the display name of the time zone. Unlike {@link #getDisplayName},
+     * this method does not get a name from a meta zone used by the time zone.
+     * @param tzID The canonical time zone ID.
+     * @param type The display name type. See {@link #UTimeZoneNameType}.
+     * @param name Receives the display name for the time zone. When this object does not have a localized display name for the given
+     *         time zone with the specified type, "bogus" state is set.
+     * @return A reference to the result.
+     * @stable ICU 50
+     */
+    virtual UnicodeString& getTimeZoneDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UnicodeString& name) const = 0;
+
+    /**
+     * Returns the exemplar location name for the given time zone. When this object does not have a localized location
+     * name, the default implementation may still returns a programmatically generated name with the logic described
+     * below.
+     * <ol>
+     * <li>Check if the ID contains "/". If not, return null.
+     * <li>Check if the ID does not start with "Etc/" or "SystemV/". If it does, return null.
+     * <li>Extract a substring after the last occurrence of "/".
+     * <li>Replace "_" with " ".
+     * </ol>
+     * For example, "New York" is returned for the time zone ID "America/New_York" when this object does not have the
+     * localized location name.
+     *
+     * @param tzID The canonical time zone ID
+     * @param name Receives the exemplar location name for the given time zone, or "bogus" state is set when a localized
+     *          location name is not available and the fallback logic described above cannot extract location from the ID.
+     * @return A reference to the result.
+     * @stable ICU 50
+     */
+    virtual UnicodeString& getExemplarLocationName(const UnicodeString& tzID, UnicodeString& name) const;
+
+    /**
+     * Returns the display name of the time zone at the given date.
+     * <p>
+     * <b>Note:</b> This method calls the subclass's {@link #getTimeZoneDisplayName} first. When the
+     * result is bogus, this method calls {@link #getMetaZoneID} to get the meta zone ID mapped from the
+     * time zone, then calls {@link #getMetaZoneDisplayName}.
+     *
+     * @param tzID The canonical time zone ID.
+     * @param type The display name type. See {@link #UTimeZoneNameType}.
+     * @param date The date.
+     * @param name Receives the display name for the time zone at the given date. When this object does not have a localized display
+     *          name for the time zone with the specified type and date, "bogus" state is set.
+     * @return A reference to the result.
+     * @stable ICU 50
+     */
+    virtual UnicodeString& getDisplayName(const UnicodeString& tzID, UTimeZoneNameType type, UDate date, UnicodeString& name) const;
+
+    /**
+     * @internal ICU internal only, for specific users only until proposed publicly.
+     */
+    virtual void loadAllDisplayNames(UErrorCode& status);
+
+    /**
+     * @internal ICU internal only, for specific users only until proposed publicly.
+     */
+    virtual void getDisplayNames(const UnicodeString& tzID, const UTimeZoneNameType types[], int32_t numTypes, UDate date, UnicodeString dest[], UErrorCode& status) const;
+
+    /**
+     * <code>MatchInfoCollection</code> represents a collection of time zone name matches used by
+     * {@link TimeZoneNames#find}.
+     * @internal
+     */
+    class U_I18N_API MatchInfoCollection : public UMemory {
+    public:
+        /**
+         * Constructor.
+         * @internal
+         */
+        MatchInfoCollection();
+        /**
+         * Destructor.
+         * @internal
+         */
+        virtual ~MatchInfoCollection();
+
+#ifndef U_HIDE_INTERNAL_API
+        /**
+         * Adds a zone match.
+         * @param nameType The name type.
+         * @param matchLength The match length.
+         * @param tzID The time zone ID.
+         * @param status Receives the status
+         * @internal
+         */
+        void addZone(UTimeZoneNameType nameType, int32_t matchLength,
+            const UnicodeString& tzID, UErrorCode& status);
+
+        /**
+         * Adds a meata zone match.
+         * @param nameType The name type.
+         * @param matchLength The match length.
+         * @param mzID The metazone ID.
+         * @param status Receives the status
+         * @internal
+         */
+        void addMetaZone(UTimeZoneNameType nameType, int32_t matchLength,
+            const UnicodeString& mzID, UErrorCode& status);
+
+        /**
+         * Returns the number of entries available in this object.
+         * @return The number of entries.
+         * @internal
+         */
+        int32_t size() const;
+
+        /**
+         * Returns the time zone name type of a match at the specified index.
+         * @param idx The index
+         * @return The time zone name type. If the specified idx is out of range,
+         *      it returns UTZNM_UNKNOWN.
+         * @see UTimeZoneNameType
+         * @internal
+         */
+        UTimeZoneNameType getNameTypeAt(int32_t idx) const;
+
+        /**
+         * Returns the match length of a match at the specified index.
+         * @param idx The index
+         * @return The match length. If the specified idx is out of range,
+         *      it returns 0.
+         * @internal
+         */
+        int32_t getMatchLengthAt(int32_t idx) const;
+
+        /**
+         * Gets the zone ID of a match at the specified index.
+         * @param idx The index
+         * @param tzID Receives the zone ID.
+         * @return TRUE if the zone ID was set to tzID.
+         * @internal
+         */
+        UBool getTimeZoneIDAt(int32_t idx, UnicodeString& tzID) const;
+
+        /**
+         * Gets the metazone ID of a match at the specified index.
+         * @param idx The index
+         * @param mzID Receives the metazone ID
+         * @return TRUE if the meta zone ID was set to mzID.
+         * @internal
+         */
+        UBool getMetaZoneIDAt(int32_t idx, UnicodeString& mzID) const;
+#endif  /* U_HIDE_INTERNAL_API */
+
+    private:
+        UVector* fMatches;  // vector of MatchEntry
+
+        UVector* matches(UErrorCode& status);
+    };
+
+    /**
+     * Finds time zone name prefix matches for the input text at the
+     * given offset and returns a collection of the matches.
+     * @param text The text.
+     * @param start The starting offset within the text.
+     * @param types The set of name types represented by bitwise flags of UTimeZoneNameType enums,
+     *              or UTZNM_UNKNOWN for all name types.
+     * @param status Receives the status.
+     * @return A collection of matches (owned by the caller), or NULL if no matches are found.
+     * @see UTimeZoneNameType
+     * @see MatchInfoCollection
+     * @internal
+     */
+    virtual MatchInfoCollection* find(const UnicodeString& text, int32_t start, uint32_t types, UErrorCode& status) const = 0;
+};
+
+U_NAMESPACE_END
+
+#endif
+
+#endif /* U_SHOW_CPLUSPLUS_API */
+
+#endif