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feat: Add strptime and strftime to datetime classes (#101)
- strftime and strptime easily map to DateTimeFormatterBuilder, although with a different syntax. - strftime and strptime are implementation dependent, yielding different results on different operating systems and locale definitions. - The JVM locale is set to the Python's locale on startup
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...eter/src/main/java/ai/timefold/jpyinterpreter/types/datetime/PythonDateTimeFormatter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package ai.timefold.jpyinterpreter.types.datetime; | ||
|
|
||
| import java.time.DayOfWeek; | ||
| import java.time.format.DateTimeFormatter; | ||
| import java.time.format.DateTimeFormatterBuilder; | ||
| import java.time.format.FormatStyle; | ||
| import java.time.format.TextStyle; | ||
| import java.time.temporal.ChronoField; | ||
| import java.time.temporal.WeekFields; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| import ai.timefold.jpyinterpreter.types.errors.ValueError; | ||
|
|
||
| /** | ||
| * Based on the format specified | ||
| * <a href="https://docs.python.org/3.11/library/datetime.html#strftime-and-strptime-format-codes">in | ||
| * the datetime documentation</a>. | ||
| */ | ||
| public class PythonDateTimeFormatter { | ||
| private final static Pattern DIRECTIVE_PATTERN = Pattern.compile("([^%]*)%(.)"); | ||
|
|
||
| static DateTimeFormatter getDateTimeFormatter(String pattern) { | ||
| DateTimeFormatterBuilder builder = new DateTimeFormatterBuilder(); | ||
| var matcher = DIRECTIVE_PATTERN.matcher(pattern); | ||
| int endIndex = 0; | ||
| while (matcher.find()) { | ||
| var literalPart = matcher.group(1); | ||
| builder.appendLiteral(literalPart); | ||
| endIndex = matcher.end(); | ||
|
|
||
| char directive = matcher.group(2).charAt(0); | ||
| switch (directive) { | ||
| case 'a' -> { | ||
| builder.appendText(ChronoField.DAY_OF_WEEK, TextStyle.SHORT); | ||
| } | ||
| case 'A' -> { | ||
| builder.appendText(ChronoField.DAY_OF_WEEK, TextStyle.FULL); | ||
| } | ||
| case 'w' -> { | ||
| builder.appendValue(ChronoField.DAY_OF_WEEK); | ||
| } | ||
| case 'd' -> { | ||
| builder.appendValue(ChronoField.DAY_OF_MONTH, 2); | ||
| } | ||
| case 'b' -> { | ||
| builder.appendText(ChronoField.MONTH_OF_YEAR, TextStyle.SHORT); | ||
| } | ||
| case 'B' -> { | ||
| builder.appendText(ChronoField.MONTH_OF_YEAR, TextStyle.FULL); | ||
| } | ||
| case 'm' -> { | ||
| builder.appendValue(ChronoField.MONTH_OF_YEAR, 2); | ||
| } | ||
| case 'y' -> { | ||
| builder.appendPattern("uu"); | ||
| } | ||
| case 'Y' -> { | ||
| builder.appendValue(ChronoField.YEAR); | ||
| } | ||
| case 'H' -> { | ||
| builder.appendValue(ChronoField.HOUR_OF_DAY, 2); | ||
| } | ||
| case 'I' -> { | ||
| builder.appendValue(ChronoField.HOUR_OF_AMPM, 2); | ||
| } | ||
| case 'p' -> { | ||
| builder.appendText(ChronoField.AMPM_OF_DAY); | ||
| } | ||
| case 'M' -> { | ||
| builder.appendValue(ChronoField.MINUTE_OF_HOUR, 2); | ||
| } | ||
| case 'S' -> { | ||
| builder.appendValue(ChronoField.SECOND_OF_MINUTE, 2); | ||
| } | ||
| case 'f' -> { | ||
| builder.appendValue(ChronoField.MICRO_OF_SECOND, 6); | ||
| } | ||
| case 'z' -> { | ||
| builder.appendOffset("+HHmmss", ""); | ||
| } | ||
| case 'Z' -> { | ||
| builder.appendZoneOrOffsetId(); | ||
| } | ||
| case 'j' -> { | ||
| builder.appendValue(ChronoField.DAY_OF_YEAR, 3); | ||
| } | ||
| case 'U' -> { | ||
| builder.appendValue(WeekFields.of(DayOfWeek.SUNDAY, 7).weekOfYear(), 2); | ||
| } | ||
| case 'W' -> { | ||
| builder.appendValue(WeekFields.of(DayOfWeek.MONDAY, 7).weekOfYear(), 2); | ||
| } | ||
| case 'c' -> { | ||
| builder.appendLocalized(FormatStyle.MEDIUM, FormatStyle.MEDIUM); | ||
| } | ||
| case 'x' -> { | ||
| builder.appendLocalized(FormatStyle.MEDIUM, null); | ||
| } | ||
| case 'X' -> { | ||
| builder.appendLocalized(null, FormatStyle.MEDIUM); | ||
| } | ||
| case '%' -> { | ||
| builder.appendLiteral("%"); | ||
| } | ||
| case 'G' -> { | ||
| builder.appendValue(WeekFields.of(DayOfWeek.MONDAY, 4).weekBasedYear()); | ||
| } | ||
| case 'u' -> { | ||
| builder.appendValue(WeekFields.of(DayOfWeek.MONDAY, 4).dayOfWeek(), 1); | ||
| } | ||
| case 'V' -> { | ||
| builder.appendValue(WeekFields.of(DayOfWeek.MONDAY, 4).weekOfYear(), 2); | ||
| } | ||
| default -> { | ||
| throw new ValueError("Invalid directive (" + directive + ") in format string (" + pattern + ")."); | ||
| } | ||
| } | ||
| } | ||
| builder.appendLiteral(pattern.substring(endIndex)); | ||
| return builder.toFormatter(); | ||
| } | ||
| } |
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