Update ICU to 58.1

source/i18n/unicode/ureldatefmt.h

Index: source/i18n/unicode/ureldatefmt.h
diff --git a/source/i18n/unicode/ureldatefmt.h b/source/i18n/unicode/ureldatefmt.h
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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*****************************************************************************************
+* Copyright (C) 2016, International Business Machines
+* Corporation and others. All Rights Reserved.
+*****************************************************************************************
+*/
+
+#ifndef URELDATEFMT_H
+#define URELDATEFMT_H
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING && !UCONFIG_NO_BREAK_ITERATION
+
+#include "unicode/unum.h"
+#include "unicode/udisplaycontext.h"
+#include "unicode/localpointer.h"
+
+/**
+ * \file
+ * \brief C API: URelativeDateTimeFormatter, relative date formatting of unit + numeric offset.
+ *
+ * Provides simple formatting of relative dates, in two ways
+ * <ul>
+ *   <li>relative dates with a quantity e.g "in 5 days"</li>
+ *   <li>relative dates without a quantity e.g "next Tuesday"</li>
+ * </ul>
+ * <p>
+ * This does not provide compound formatting for multiple units,
+ * other than the ability to combine a time string with a relative date,
+ * as in "next Tuesday at 3:45 PM". It also does not provide support
+ * for determining which unit to use, such as deciding between "in 7 days"
+ * and "in 1 week".
+ *
+ * @draft ICU 57
+ */
+
+/**
+ * The formatting style
+ * @stable ICU 54
+ */
+typedef enum UDateRelativeDateTimeFormatterStyle {
+  /**
+   * Everything spelled out.
+   * @stable ICU 54
+   */
+  UDAT_STYLE_LONG,
+
+  /**
+   * Abbreviations used when possible.
+   * @stable ICU 54
+   */
+  UDAT_STYLE_SHORT,
+
+  /**
+   * Use the shortest possible form.
+   * @stable ICU 54
+   */
+  UDAT_STYLE_NARROW,
+
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal UDateRelativeDateTimeFormatterStyle value.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
+    UDAT_STYLE_COUNT
+#endif  // U_HIDE_DEPRECATED_API
+} UDateRelativeDateTimeFormatterStyle;
+
+#ifndef U_HIDE_DRAFT_API
+/**
+ * Represents the unit for formatting a relative date. e.g "in 5 days"
+ * or "next year"
+ * @draft ICU 57
+ */
+typedef enum URelativeDateTimeUnit {
+    /**
+     * Specifies that relative unit is year, e.g. "last year",
+     * "in 5 years". 
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_YEAR,
+    /**
+     * Specifies that relative unit is quarter, e.g. "last quarter",
+     * "in 5 quarters".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_QUARTER,
+    /**
+     * Specifies that relative unit is month, e.g. "last month",
+     * "in 5 months".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_MONTH,
+    /**
+     * Specifies that relative unit is week, e.g. "last week",
+     * "in 5 weeks".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_WEEK,
+    /**
+     * Specifies that relative unit is day, e.g. "yesterday",
+     * "in 5 days".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_DAY,
+    /**
+     * Specifies that relative unit is hour, e.g. "1 hour ago",
+     * "in 5 hours".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_HOUR,
+    /**
+     * Specifies that relative unit is minute, e.g. "1 minute ago",
+     * "in 5 minutes".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_MINUTE,
+    /**
+     * Specifies that relative unit is second, e.g. "1 second ago",
+     * "in 5 seconds".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_SECOND,
+    /**
+     * Specifies that relative unit is Sunday, e.g. "last Sunday",
+     * "this Sunday", "next Sunday", "in 5 Sundays".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_SUNDAY,
+    /**
+     * Specifies that relative unit is Monday, e.g. "last Monday",
+     * "this Monday", "next Monday", "in 5 Mondays".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_MONDAY,
+    /**
+     * Specifies that relative unit is Tuesday, e.g. "last Tuesday",
+     * "this Tuesday", "next Tuesday", "in 5 Tuesdays".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_TUESDAY,
+    /**
+     * Specifies that relative unit is Wednesday, e.g. "last Wednesday",
+     * "this Wednesday", "next Wednesday", "in 5 Wednesdays".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_WEDNESDAY,
+    /**
+     * Specifies that relative unit is Thursday, e.g. "last Thursday",
+     * "this Thursday", "next Thursday", "in 5 Thursdays". 
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_THURSDAY,
+    /**
+     * Specifies that relative unit is Friday, e.g. "last Friday",
+     * "this Friday", "next Friday", "in 5 Fridays".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_FRIDAY,
+    /**
+     * Specifies that relative unit is Saturday, e.g. "last Saturday",
+     * "this Saturday", "next Saturday", "in 5 Saturdays".
+     * @draft ICU 57
+     */
+    UDAT_REL_UNIT_SATURDAY,
+#ifndef U_HIDE_DEPRECATED_API
+    /**
+     * One more than the highest normal URelativeDateTimeUnit value.
+     * @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
+     */
+    UDAT_REL_UNIT_COUNT
+#endif  // U_HIDE_DEPRECATED_API
+} URelativeDateTimeUnit;
+#endif  /* U_HIDE_DRAFT_API */
+
+#ifndef U_HIDE_DRAFT_API
+
+/**
+ * Opaque URelativeDateTimeFormatter object for use in C programs.
+ * @draft ICU 57
+ */
+struct URelativeDateTimeFormatter;
+typedef struct URelativeDateTimeFormatter URelativeDateTimeFormatter;  /**< C typedef for struct URelativeDateTimeFormatter. @draft ICU 57 */
+
+
+/**
+ * Open a new URelativeDateTimeFormatter object for a given locale using the
+ * specified width and capitalizationContext, along with a number formatter
+ * (if desired) to override the default formatter that would be used for
+ * display of numeric field offsets. The default formatter typically rounds
+ * toward 0 and has a minimum of 0 fraction digits and a maximum of 3
+ * fraction digits (i.e. it will show as many decimal places as necessary
+ * up to 3, without showing trailing 0s).
+ *
+ * @param locale
+ *          The locale
+ * @param nfToAdopt
+ *          A number formatter to set for this URelativeDateTimeFormatter
+ *          object (instead of the default decimal formatter). Ownership of
+ *          this UNumberFormat object will pass to the URelativeDateTimeFormatter
+ *          object (the URelativeDateTimeFormatter adopts the UNumberFormat),
+ *          which becomes responsible for closing it. If the caller wishes to
+ *          retain ownership of the UNumberFormat object, the caller must clone
+ *          it (with unum_clone) and pass the clone to ureldatefmt_open. May be
+ *          NULL to use the default decimal formatter.
+ * @param width
+ *          The width - wide, short, narrow, etc.
+ * @param capitalizationContext
+ *          A value from UDisplayContext that pertains to capitalization, e.g.
+ *          UDISPCTX_CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE.
+ * @param status
+ *          A pointer to a UErrorCode to receive any errors.
+ * @return
+ *          A pointer to a URelativeDateTimeFormatter object for the specified locale,
+ *          or NULL if an error occurred.
+ * @draft ICU 57
+ */
+U_DRAFT URelativeDateTimeFormatter* U_EXPORT2
+ureldatefmt_open( const char*          locale,
+                  UNumberFormat*       nfToAdopt,
+                  UDateRelativeDateTimeFormatterStyle width,
+                  UDisplayContext      capitalizationContext,
+                  UErrorCode*          status );
+
+/**
+ * Close a URelativeDateTimeFormatter object. Once closed it may no longer be used.
+ * @param reldatefmt
+ *            The URelativeDateTimeFormatter object to close.
+ * @draft ICU 57
+ */
+U_DRAFT void U_EXPORT2
+ureldatefmt_close(URelativeDateTimeFormatter *reldatefmt);
+
+#if U_SHOW_CPLUSPLUS_API
+
+U_NAMESPACE_BEGIN
+
+/**
+ * \class LocalURelativeDateTimeFormatterPointer
+ * "Smart pointer" class, closes a URelativeDateTimeFormatter via ureldatefmt_close().
+ * For most methods see the LocalPointerBase base class.
+ *
+ * @see LocalPointerBase
+ * @see LocalPointer
+ * @draft ICU 57
+ */
+U_DEFINE_LOCAL_OPEN_POINTER(LocalURelativeDateTimeFormatterPointer, URelativeDateTimeFormatter, ureldatefmt_close);
+
+U_NAMESPACE_END
+
+#endif
+
+/**
+ * Format a combination of URelativeDateTimeUnit and numeric
+ * offset using a numeric style, e.g. "1 week ago", "in 1 week",
+ * "5 weeks ago", "in 5 weeks".
+ *
+ * @param reldatefmt
+ *          The URelativeDateTimeFormatter object specifying the
+ *          format conventions.
+ * @param offset
+ *          The signed offset for the specified unit. This will
+ *          be formatted according to this object's UNumberFormat
+ *          object.
+ * @param unit
+ *          The unit to use when formatting the relative
+ *          date, e.g. UDAT_REL_UNIT_WEEK, UDAT_REL_UNIT_FRIDAY.
+ * @param result
+ *          A pointer to a buffer to receive the formatted result.
+ * @param resultCapacity
+ *          The maximum size of result.
+ * @param status
+ *          A pointer to a UErrorCode to receive any errors. In
+ *          case of error status, the contents of result are
+ *          undefined.
+ * @return
+ *          The length of the formatted result; may be greater
+ *          than resultCapacity, in which case an error is returned.
+ * @draft ICU 57
+ */
+U_DRAFT int32_t U_EXPORT2
+ureldatefmt_formatNumeric( const URelativeDateTimeFormatter* reldatefmt,
+                    double                offset,
+                    URelativeDateTimeUnit unit,
+                    UChar*                result,
+                    int32_t               resultCapacity,
+                    UErrorCode*           status);
+
+/**
+ * Format a combination of URelativeDateTimeUnit and numeric offset
+ * using a text style if possible, e.g. "last week", "this week",
+ * "next week", "yesterday", "tomorrow". Falls back to numeric
+ * style if no appropriate text term is available for the specified
+ * offset in the object's locale.
+ *
+ * @param reldatefmt
+ *          The URelativeDateTimeFormatter object specifying the
+ *          format conventions.
+ * @param offset
+ *          The signed offset for the specified unit.
+ * @param unit
+ *          The unit to use when formatting the relative
+ *          date, e.g. UDAT_REL_UNIT_WEEK, UDAT_REL_UNIT_FRIDAY.
+ * @param result
+ *          A pointer to a buffer to receive the formatted result.
+ * @param resultCapacity
+ *          The maximum size of result.
+ * @param status
+ *          A pointer to a UErrorCode to receive any errors. In
+ *          case of error status, the contents of result are
+ *          undefined.
+ * @return
+ *          The length of the formatted result; may be greater
+ *          than resultCapacity, in which case an error is returned.
+ * @draft ICU 57
+ */
+U_DRAFT int32_t U_EXPORT2
+ureldatefmt_format( const URelativeDateTimeFormatter* reldatefmt,
+                    double                offset,
+                    URelativeDateTimeUnit unit,
+                    UChar*                result,
+                    int32_t               resultCapacity,
+                    UErrorCode*           status);
+
+/**
+ * Combines a relative date string and a time string in this object's
+ * locale. This is done with the same date-time separator used for the
+ * default calendar in this locale to produce a result such as
+ * "yesterday at 3:45 PM".
+ *
+ * @param reldatefmt
+ *          The URelativeDateTimeFormatter object specifying the format conventions.
+ * @param relativeDateString
+ *          The relative date string.
+ * @param relativeDateStringLen
+ *          The length of relativeDateString; may be -1 if relativeDateString
+ *          is zero-terminated.
+ * @param timeString
+ *          The time string.
+ * @param timeStringLen
+ *          The length of timeString; may be -1 if timeString is zero-terminated.
+ * @param result
+ *          A pointer to a buffer to receive the formatted result.
+ * @param resultCapacity
+ *          The maximum size of result.
+ * @param status
+ *          A pointer to a UErrorCode to receive any errors. In case of error status,
+ *          the contents of result are undefined.
+ * @return
+ *          The length of the formatted result; may be greater than resultCapacity,
+ *          in which case an error is returned.
+ * @draft ICU 57
+ */
+U_DRAFT int32_t U_EXPORT2
+ureldatefmt_combineDateAndTime( const URelativeDateTimeFormatter* reldatefmt,
+                    const UChar *     relativeDateString,
+                    int32_t           relativeDateStringLen,
+                    const UChar *     timeString,
+                    int32_t           timeStringLen,
+                    UChar*            result,
+                    int32_t           resultCapacity,
+                    UErrorCode*       status );
+
+#endif  /* U_HIDE_DRAFT_API */
+
+#endif /* !UCONFIG_NO_FORMATTING && !UCONFIG_NO_BREAK_ITERATION */
+
+#endif