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Update the docs for byUnicodePattern
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‎core/common/src/format/migration/Unicode.kt

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@@ -39,11 +39,56 @@ public annotation class FormatStringsInDatetimeFormats
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*
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* In addition to the standard syntax, this function also supports the following extensions:
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* * `[]` denote optional sections. For example, `hh:mm[:ss]` will allow parsing seconds optionally.
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* This is similar to what is supported by the Java Time's `DateTimeFormatter` class, but with the difference that,
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* for formatting, the optional sections have a different meaning: they are not included in the output if all the
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* fields they contain have their default values. See [DateTimeFormatBuilder.optional] for more details.
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* * One or more `p` characters before a field specifies that the field should be padded with zeroes to the length
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* equal to the number of `p` characters. This is also supported by the Java Time's `DateTimeFormatter` class.
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* This is similar to what is supported by the Java Time's `DateTimeFormatter` class.
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*
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* Usage example:
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* ```
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* DateTimeComponents.Format {
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* // 2023-01-20T23:53:16.312+03:30[Asia/Tehran]
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* byUnicodePattern("uuuu-MM-dd'T'HH:mm[:ss[.SSS]]xxxxx'['VV']'")
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* }
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* ```
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*
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* The list of supported directives is as follows:
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*
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* | **Directive** | **Meaning** |
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* | `'string'` | literal `string`, without quotes |
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* | `'''` | literal char `'` |
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* | `[fmt]` | equivalent to `fmt` during formatting, but during parsing also accepts the empty string |
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* | `u` | ISO year without padding |
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* | `uu` | last two digits of the ISO year, with the base year 2000 |
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* | `uuuu` | ISO year, zero-padded to four digits |
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* | `M`, `L` | month number (1-12), without padding |
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* | `MM`, `LL` | month number (01-12), zero-padded to two digits |
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* | `d` | day-of-month (1-31), without padding |
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* | `H` | hour-of-day (0-23), without padding |
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* | `HH` | hour-of-day (00-23), zero-padded to two digits |
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* | `m` | minute-of-hour (0-59), without padding |
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* | `mm` | minute-of-hour (00-59), zero-padded to two digits |
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* | `s` | second-of-hour (0-59), without padding |
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* | `ss` | second-of-hour (00-59), zero-padded to two digits |
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* | `S`, `SS`, `SSS`... | fraction-of-second without a leading dot, with as many digits as the format length |
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* | `VV` | timezone name (for example, `Europe/Berlin`) |
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*
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* The UTC offset is formatted using one of the following directives. In every one of these formats, hours, minutes,
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* and seconds are zero-padded to two digits. Also, hours are unconditionally present.
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*
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* | **Directive** | **Minutes** | **Seconds** | **Separator** | **Representation of zero** |
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* | `X` | unless zero | never | none | `Z` |
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* | `XX` | always | never | none | `Z` |
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* | `XXX` | always | never | colon | `Z` |
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* | `XXXX` | always | unless zero | none | `Z` |
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* | `XXXXX`, `ZZZZZ` | always | unless zero | colon | `Z` |
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* | `x` | unless zero | never | none | `+00` |
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* | `xx`, `Z`, `ZZ`, `ZZZ` | always | never | none | `+0000` |
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* | `xxx` | always | never | colon | `+00:00` |
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* | `xxxx` | always | unless zero | none | `+0000` |
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* | `xxxxx` | always | unless zero | colon | `+00:00` |
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*
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* `y` is the most common way to represent the year, but it's not supported by [byUnicodePattern] because its
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* interpretation depends on which calendar is being used.
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* For the ISO chronology and years 0001 and later, one can obtain results that are equivalent to `yyyy` and `yy` like
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* this: `byUnicodePattern(pattern.replace("yyyy", "uuuu").replace("yy", "uu")`.
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*
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* @throws IllegalArgumentException if the pattern is invalid or contains unsupported directives.
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* @throws IllegalArgumentException if the builder is incompatible with the specified directives.
@@ -378,7 +423,7 @@ internal sealed interface UnicodeFormat {
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class FractionOfSecond(override val formatLength: Int) : WithSubsecondPrecision() {
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override val formatLetter = 'S'
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override fun addToFormat(builder: DateTimeFormatBuilder.WithTime) =
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builder.secondFraction(minLength = formatLength, maxLength = formatLength)
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builder.secondFraction(formatLength)
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}
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class MilliOfDay(override val formatLength: Int) : WithSubsecondPrecision() {
@@ -407,7 +452,10 @@ internal sealed interface UnicodeFormat {
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class TimeZoneId(override val formatLength: Int) : ZoneBased() {
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override val formatLetter = 'V'
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override fun addToFormat(builder: DateTimeFormatBuilder.WithDateTimeComponents) = builder.timeZoneId()
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override fun addToFormat(builder: DateTimeFormatBuilder.WithDateTimeComponents) = when (formatLength) {
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2 -> builder.timeZoneId()
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else -> unknownLength()
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}
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}
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class GenericTimeZoneName(override val formatLength: Int) : ZoneBased() {

‎core/common/test/format/DateTimeComponentsFormatTest.kt

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Original file line numberDiff line numberDiff line change
@@ -162,6 +162,15 @@ class DateTimeComponentsFormatTest {
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assertNull(bagWithAlternative.nanosecond)
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}
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@OptIn(FormatStringsInDatetimeFormats::class)
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@Test
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fun testByUnicodePatternDoc() {
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val format = DateTimeComponents.Format {
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byUnicodePattern("uuuu-MM-dd'T'HH:mm[:ss[.SSS]]xxxxx'['VV']'")
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}
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format.parse("2023-01-20T23:53:16.312+03:30[Asia/Tehran]")
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}
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private fun test(strings: Map<DateTimeComponents, Pair<String, Set<String>>>, format: DateTimeFormat<DateTimeComponents>) {
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for ((value, stringsForValue) in strings) {
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val (canonicalString, otherStrings) = stringsForValue

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