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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef intl_components_DateTimePart_h_
#define intl_components_DateTimePart_h_
#include <cstddef>
#include <cstdint>
#include "mozilla/Vector.h"
namespace mozilla::intl {
enum class DateTimePartType : int16_t {
Literal,
Weekday,
Era,
Year,
YearName,
RelatedYear,
Month,
Day,
DayPeriod,
Hour,
Minute,
Second,
FractionalSecondDigits,
TimeZoneName,
Unknown
};
enum class DateTimePartSource : int16_t { Shared, StartRange, EndRange };
/**
* The 'Part' object defined in FormatDateTimeToParts and
* FormatDateTimeRangeToParts
*
* Each part consists of three properties: ||Type||, ||Value|| and ||Source||,
* with the ||Source|| property is set to DateTimePartSource::Shared by default.
* (Note: From the spec, the part from FormatDateTimeToParts doesn't have the
* ||Source|| property, so if the caller is FormatDateTimeToParts, it should
* ignore the ||Source|| property).
*
* To store DateTimePart more efficiently, it doesn't store the ||Value|| of
* type string in this struct. Instead, it stores the end index of the string
* in the buffer(which is passed to DateTimeFormat::TryFormatToParts() or
* can be got by calling AutoFormattedDateInterval::ToSpan()). The begin index
* of the ||Value|| is the mEndIndex of the previous part.
*
* Buffer
* 0 i j
* +---------------+---------------+---------------+
* | Part[0].Value | Part[1].Value | Part[2].Value | ....
* +---------------+---------------+---------------+
*
* Part[0].mEndIndex is i. Part[0].Value is stored in the Buffer[0..i].
* Part[1].mEndIndex is j. Part[1].Value is stored in the Buffer[i..j].
*
* See:
* https://tc39.es/ecma402/#sec-formatdatetimetoparts
* https://tc39.es/ecma402/#sec-formatdatetimerangetoparts
*/
struct DateTimePart {
DateTimePart(DateTimePartType type, size_t endIndex,
DateTimePartSource source)
: mEndIndex(endIndex), mType(type), mSource(source) {}
// See the above comments for details, mEndIndex is placed first for reducing
// padding.
size_t mEndIndex;
DateTimePartType mType;
DateTimePartSource mSource;
};
// The common parts are 'month', 'literal', 'day', 'literal', 'year', 'literal',
// 'hour', 'literal', 'minute', 'literal', which are 10 parts, for DateTimeRange
// the number will be doubled, so choosing 32 as the initial length to prevent
// heap allocation.
constexpr size_t INITIAL_DATETIME_PART_VECTOR_SIZE = 32;
using DateTimePartVector =
mozilla::Vector<DateTimePart, INITIAL_DATETIME_PART_VECTOR_SIZE>;
} // namespace mozilla::intl
#endif
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