Peek in Calendar implementation of swift-foundation

$ZCP[V.PCJMF.FFUVQ TXJGUGPVOEBUJPO $BMFOEBSͷ࣮૷Λ೷͘

ΞδΣϯμ w TXJGUGPVOEBUJPOʹ͍ͭͯ w TXJGUGPVOEBUJPO TXJGUGPVOEBUJPOJDVͷؔ܎ਤ w TXJGUGPVOEBUJPOΛ೷͘ • date(bySetting:value:for:)
• date(byAdding:value:to:wrappingComponents:)

w IPLVSPO w 5XJUUFS (JU)VC ;FOO FUDʜ w ೖࣾ w
αΠϘ΢ζ0 ffi DFJ04 ࣗݾ঺հ

TXJGUGPVOEBUJPO ֓ཁ w BQQMFTXJGUGPVOEBUJPOϦϙδτϦ w 'PVOEBUJPOͷΦʔϓϯιʔε൛ w طଘͷ'PVOEBUJPOΑΓ΋଎͍ w IUUQTHJUIVCDPNBQQMFTXJGUGPVOEBUJPO
w IUUQTXXXTXJGUPSHCMPHGPVOEBUJPOQSFWJFXOPXBWBJMBCMF

TXJGUGPVOEBUJPO TXJGUGPVOEBUJPOJDVύοέʔδ w TXJGUGPVOEBUJPO͕ґଘ͢Δ*$6࣮૷ w ཪํతͳଘࡏ w BQQMFPTTEJTUSJCVUJPOT*$6ϦϙδτϦ͔Βࣗಈநग़ w 4XJGU1.Λαϙʔτ
w $ ϥΠϒϥϦ w TXJGUGPVOEBUJPO͔Βར༻Ͱ͖ΔΑ͏ʹϒϦοδ༻$࣮૷΋༻ҙ ''*

TXJGUGPVOEBUJPO w *OUFSOBUJPOBM$PNQPOFOUTGPS6OJDPEF w 6OJDPEFͱJOΛఏڙ͢ΔϥΠϒϥϦ w ࣌ؒʹؔ͢Δԋࢉ ྐྵͷऔΓѻ͍΍λΠϜκʔϯԋࢉ w
਺஋ɺ೔࣌ɺ௨՟ͳͲͷϑΥʔϚολʔ w ଞɺ6OJDPEFͷαϙʔτɺςΩετڥքɺਖ਼نදݱͳͲ *$6

TXJGUGPVOEBUJPO w *$6͕࣋ͭػೳΛ૊Έ߹Θͤͯಠࣗͷ"1*Λఏڙ w *$6Ͱͷԋࢉ݁ՌͷՃ޻ w *$6Ͱ͸࣮૷͞Ε͍ͯͳ͍೔෇ԋࢉͷ࣮૷ w Calendar →
_Calendar → ICU4C TXJGUGPVOEBUJPOJDVͱͷؔ܎ੑ Calendarͷ৔߹

TXJGUGPVOEBUJPO w NSCalendarΫϥεͷ୯ͳΔϥούʔ w ΄ͱΜͲͷ৔߹ɺNSCalendarͷಉ໊ͷϝιουʹॲཧΛҠৡ͍ͯ͠Δ͚ͩ w $PSF'PVOEBUJPO΋όϯυϧ͞Ε͓ͯΓɺCFCalendarͰ*$6Λݺͼग़͢ w TXJGUGPVOEBUJPO JDV
ొ৔Ҏલ͔Βৄࡉͳ࣮૷ΛݟΔ͜ͱ͸Ͱ͖͍ͯͨ w TXJGUGPVOEBUJPOͱൺֱͯ͠Ͳͷఔ౓ͷৄࡉ͔͞͸ະ֬ೝ w Calendar → NSCalendar (CFCalendar) → ICU4C طଘͷTXJGUDPSFMJCTGPVOEBUJPO Calendarͷ৔߹

struct Calendar class _Calendar class Calendar class GregorianCalendar class JapaneseCalendar
ɾ ɾ ɾ class EraRules (ucal.cpp) TXJGUGPVOEBUJPO TXJGUGPVOEBUJPOJDV

struct Calendar class _Calendar TXJGUGPVOEBUJPO

TXJGUGPVOEBUJPO w ७ਮͳ4XJGUͷߏ଄ମ 7BMVFTFNBOUJDT w ΫϥΠΞϯτ͕௚઀ѻ͏͜ͱʹͳΔ෦෼ w _Calendar͔Βͷ໭ͬͯ͘Δ݁ՌͷՃ޻ w
_Calendar΍*$6Ͱ͸࣮૷͞Ε͍ͯͳ͍೔෇ԋࢉͷ࣮૷ public struct Calendar

TXJGUGPVOEBUJPO w ओʹ*$6΁ͷϒϦοδ w VDBMDQQʹఆٛ͞Εͨؔ਺ ''* ͷݺͼग़͠ w ݺͼग़͠தͷϩοΫ w
*$6Ͱ͸࣮૷͞Ε͍ͯͳ͍೔෇ԋࢉͷ࣮૷ internal class _Calendar

struct Calendar class _Calendar TXJGUGPVOEBUJPO

class Calendar class GregorianCalendar class JapaneseCalendar ɾ ɾ ɾ class
EraRules (ucal.cpp) TXJGUGPVOEBUJPOJDV

TXJGUGPVOEBUJPOJDV w 4XJGU͔Β*$6 $ ࣮૷ Λݺͼग़ͨ͢Ίͷ''* 'PSFJHO'VODUJPO*OUFSGBDF w 4XJGUͰ$
Λ௚઀ݺ΂ΔΑ͏ʹͳͬͨͷͰ͸ʁ w *$6ͷCalendarΫϥεͷϙΠϯλΛఏڙ w ઌͷ_CalendarΫϥε͔Βؒ઀తʹ*$6ͷCalendarΫϥεʹΞΫηεՄೳʹ ucal.cpp

TXJGUGPVOEBUJPOJDV w *$6 w ྐྵಠࣗͷࣄ৘Λߟྀͨ͠೿ੜΫϥε w GregorianCalendar ϢϦ΢εྐྵ άϨΰϦΦྐྵ
w JapaneseCalendar ࿨ྐྵ w ਖ਼֬ʹ͸GregorianCalendarͷαϒΫϥε w FSBͱZFBSͷಈ͖͕ಛघͳͨΊɺ͞ΒʹEraRulesΫϥε͕༻ҙ͞Ε͍ͯΔ class Calendar

class Calendar class GregorianCalendar class JapaneseCalendar ɾ ɾ ɾ class
EraRules (ucal.cpp) TXJGUGPVOEBUJPOJDV

• date(bySetting:value:for:) -> Date? • date(byAdding:value:to:wrappingComponents:) -> Date? w υΩϡϝϯςʔγϣϯ͔Β͸ɺOJM͕ฦ͞ΕΔ৚͕͍݅·͍ͪΘ͔Βͳ͍
w NSCalendarͰ͸ॻ͔Ε͍ͯΔ಺༰͕ඍົʹҧ͏ w ͚Ͳ΍ͬͺΓΘ͔Βͳ͍ w ͱΓ͋͑ͣɺvalueҾ਺ʹInt.maxΛ౉͕ͪ͠ w ༗ޮൣғΛ୳ΔͷఘΊ͕ͪ TXJGUGPVOEBUJPOΛ೷͘

දʹ·ͱΊ·ͨ͠

஫ҙשى IUUQTHJUIVCDPNBQQMFTXJGUGPVOEBUJPOUSFF CCBGEDFCBEFDEFD ͜ͷ࣌఺ ˢ ͷιʔείʔυΛࢀর͍ͯ͠·͢ɻ TXJGUGPVOEBUJPOͱTXJGUGPVOEBUJPOJDVͷίʔυ΍࣮ࡍʹಈ͔ͨ݁͠Ռ͔Βಡ Έऔͬͨ݁ՌͰ͢ɻਖ਼֬ʹಡΈऔΕͨอূ͸Ͱ͖͔Ͷ·͢ɻ ֬ೝͨ͠ྐྵ͸ɺάϨΰϦΦྐྵͱ࿨ྐྵͷΈͰ͢ɻͦͷଞͷྐྵͰ͸ɺҟͳΔ݁ՌʹͳΔ ͔΋͠Ε·ͤΜɻ
04ʹόϯυϧ͞Ε͍ͯΔ'PVOEBUJPO͕ɺಉ༷ͷಈ͖Λ͢Δͷ͔͸͖ͪΜͱ֬ೝ͠ ͍ͯ·ͤΜɻ

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ component era year value (Gregorian) d
d value (Japanese) d ্ݶ͸೥߸͕ มΘΔ͝ͱʹ૿Ճ dάϨΰϦΦྐྵͷ্ݶ͔Β dateͷ೥߸͕։࢝ͨ͠೥Λݮࢉ ྫ ݱࡏ ྩ࿨։࢝ͷ೥ Լݶͷิ଍ Լݶ͸ɺdateҾ਺ͷ஋ΑΓ΋ԼճΔ஋Λࢦఆ͢Δͱnil͕ฦΔ ྫ ݱࡏ ྐྵʹ.gregorianΛɺdateʹ.nowΛࢦఆɹɹɹɹྐྵʹ.japaneseΛɺdateʹ.nowΛࢦఆ FSB ੢ྐྵ ˠ⭕ɺ لݩલ ˠ❌ɹɹɹɹɹɹɹɹFSB ྩ࿨ ˠ⭕ɺ ฏ੒ ˠ❌ ZFBSˠ⭕ɺҎԼˠ❌ɹɹɹɹɹɹɹɹZFBSˠ⭕ɺҎԼˠ❌

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ component month day hour minute, second
weekday quarter weekOfMonth weekOfYear nanosecond value (ڞ௨) d d d d d d ͸ɺdateΛ ͦͷ··ฦ͢ d d d

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ component calendar timeZone isLeapMonth value ৗʹnil͕ฦ͞ΕΔ
ৗʹnil͕ฦ͞ΕΔ ৗʹnil͕ฦ͞ΕΔ

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ w weekdayOrdinalͱyearForWeekOfYear͸ௐ΂͖Εͳ͔ͬͨ w weekdayOrdinal ͸ɺ༗ޮൣғ಺ͱࢥΘΕΔ஋Ͱ΋Ϋϥογϡͨ͠Γॲཧ͕ࢭ·ͬͨΓ͢Δ

w ϢϦ΢ε೔͔ΒTXJGUGPVOEBUJPO͕نఆ͢Δ࣌఺·Ͱ w طଘ࣮૷ͱͷޓ׵ੑͷͨΊʁ w d Date(timeIntervalSinceReferenceDate: -211845067200.0)…
Date(timeIntervalSinceReferenceDate: 15927175497600.0) w date͕͜ͷൣғΛ௒͑Δͱnil͕ฦ͞ΕΔ w date(byAdding:value:to:wrappingComponents:)ͱ͸ҟͳΔ date date(bySetting:value:for:)

date(byAdding:value:to:wrappingComponents:) componentx value ͷ༗ޮൣғ component era, year, month, day, hour,
minute, second, weekday, weekdayOrdinal, quarter, weekOfMonth, weekOfYear, yearForWeekOfYear, nanosecond calendar timeZone isLeapMonth value IntͷൣғͰ ੍ݶͳ͠ ৗʹnil͕ฦ͞ΕΔৗʹnil͕ฦ͞ΕΔৗʹnil͕ฦ͞ΕΔ

date(byAdding:value:to:wrappingComponents:) w ϢϦ΢ε೔͔ΒTXJGUGPVOEBUJPO͕نఆ͢Δ࣌఺·Ͱ w d Date(timeIntervalSinceReferenceDate: -211845067200.0)… Date(timeIntervalSinceReferenceDate:
15927175497600.0) w date͸ɺԋࢉલʹ͜ͷൣғʹऩ·ΔΑ͏ʹmax(min())͕औΒΕΔ w ԋࢉͷ݁Ռɺ͜ͷൣғ֎ʹͳͬͯ΋ͦͷ··ฦ͢ w *$6ଆͰ͸΋ͬͱେ͖ͳൣғ لݩલສ೥ ～ ੢ྐྵສ೥ ͕ѻ͑Δ ࠷ॳͷાஔΛߦ͏ͷ͸ɺTXJGUGPVOEBUJPOͷ੍໿ʁ date

date(byAdding:value:to:wrappingComponents:) w ݁ՌʹӨڹ͠ͳ͍ wrappingComponents

• date(bySetting:value:for:) -> Date? • date(byAdding:value:to:wrappingComponents:) -> Date? w υΩϡϝϯςʔγϣϯ͔Β͸ɺOJM͕ฦ͞ΕΔ৚͕͍݅·͍ͪΘ͔Βͳ͍
w NSCalendarͰ͸ॻ͔Ε͍ͯΔ಺༰͕ඍົʹҧ͏ w ͚Ͳ΍ͬͺΓΘ͔Βͳ͍ wͱΓ͋͑ͣɺvalueҾ਺ʹInt.maxΛ౉͕ͪ͠ w ༗ޮൣғΛ୳ΔͷఘΊ͕ͪ TXJGUGPVOEBUJPOΛ೷͘

value ʹ .max Λ౉͢ͱɺ date(byAdding:…)ͷ৔߹͸ɺdate ͷ஋͕ͦͷ··ฦ͞ΕΔ date(bySetting:…)ͷ৔߹͸ɺnil ͕ฦ͞ΕΔ

Peek in Calendar implementation of swift-founda...

Peek in Calendar implementation of swift-foundation

Takuma Shimizu

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$ZCP[V.PCJMF.FFUVQ TXJGUGPVOEBUJPO $BMFOEBSͷ࣮૷Λ೷͘

ΞδΣϯμ w TXJGUGPVOEBUJPOʹ͍ͭͯ w TXJGUGPVOEBUJPO TXJGUGPVOEBUJPOJDVͷؔ܎ਤ w TXJGUGPVOEBUJPOΛ೷͘ • date(bySetting:value:for:)

w IPLVSPO w 5XJUUFS (JU)VC ;FOO FUDʜ w ೖࣾ w

TXJGUGPVOEBUJPO ֓ཁ w BQQMFTXJGUGPVOEBUJPOϦϙδτϦ w 'PVOEBUJPOͷΦʔϓϯιʔε൛ w طଘͷ'PVOEBUJPOΑΓ΋଎͍ w IUUQTHJUIVCDPNBQQMFTXJGUGPVOEBUJPO

TXJGUGPVOEBUJPO TXJGUGPVOEBUJPOJDVύοέʔδ w TXJGUGPVOEBUJPO͕ґଘ͢Δ$6࣮૷ w ཪํతͳଘࡏ w BQQMFPTTEJTUSJCVUJPOT$6ϦϙδτϦ͔Βࣗಈநग़ w 4XJGU1.Λαϙʔτ

TXJGUGPVOEBUJPO w *OUFSOBUJPOBM$PNQPOFOUTGPS6OJDPEF w 6OJDPEFͱJOΛఏڙ͢ΔϥΠϒϥϦ w ࣌ؒʹؔ͢Δԋࢉ ྐྵͷऔΓѻ͍΍λΠϜκʔϯԋࢉ w

TXJGUGPVOEBUJPO w $6͕࣋ͭػೳΛ૊Έ߹Θͤͯಠࣗͷ"1Λఏڙ w $6Ͱͷԋࢉ݁ՌͷՃ޻ w $6Ͱ͸࣮૷͞Ε͍ͯͳ͍೔෇ԋࢉͷ࣮૷ w Calendar →

TXJGUGPVOEBUJPO w NSCalendarΫϥεͷ୯ͳΔϥούʔ w ΄ͱΜͲͷ৔߹ɺNSCalendarͷಉ໊ͷϝιουʹॲཧΛҠৡ͍ͯ͠Δ͚ͩ w $PSF'PVOEBUJPO΋όϯυϧ͞Ε͓ͯΓɺCFCalendarͰ*$6Λݺͼग़͢ w TXJGUGPVOEBUJPO JDV

struct Calendar class _Calendar class Calendar class GregorianCalendar class JapaneseCalendar

struct Calendar class _Calendar TXJGUGPVOEBUJPO

TXJGUGPVOEBUJPO w ७ਮͳ4XJGUͷߏ଄ମ 7BMVFTFNBOUJDT w ΫϥΠΞϯτ͕௚઀ѻ͏͜ͱʹͳΔ෦෼ w _Calendar͔Βͷ໭ͬͯ͘Δ݁ՌͷՃ޻ w

TXJGUGPVOEBUJPO w ओʹ$6΁ͷϒϦοδ w VDBMDQQʹఆٛ͞Εͨؔ਺ '' ͷݺͼग़͠ w ݺͼग़͠தͷϩοΫ w

struct Calendar class _Calendar TXJGUGPVOEBUJPO

struct Calendar class _Calendar class Calendar class GregorianCalendar class JapaneseCalendar

class Calendar class GregorianCalendar class JapaneseCalendar ɾ ɾ ɾ class

TXJGUGPVOEBUJPOJDV w 4XJGU͔Β$6 $ ࣮૷ Λݺͼग़ͨ͢Ίͷ'' 'PSFJHO'VODUJPO*OUFSGBDF w 4XJGUͰ$

TXJGUGPVOEBUJPOJDV w *$6 w ྐྵಠࣗͷࣄ৘Λߟྀͨ͠೿ੜΫϥε w GregorianCalendar ϢϦ΢εྐྵ άϨΰϦΦྐྵ

class Calendar class GregorianCalendar class JapaneseCalendar ɾ ɾ ɾ class

struct Calendar class _Calendar class Calendar class GregorianCalendar class JapaneseCalendar

• date(bySetting:value:for:) -> Date? • date(byAdding:value:to:wrappingComponents:) -> Date? w υΩϡϝϯςʔγϣϯ͔Β͸ɺOJM͕ฦ͞ΕΔ৚͕͍݅·͍ͪΘ͔Βͳ͍

දʹ·ͱΊ·ͨ͠

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ component era year value (Gregorian) d

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ component month day hour minute, second

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ component calendar timeZone isLeapMonth value ৗʹnil͕ฦ͞ΕΔ

date(bySetting:value:for:) componentx value ͷ༗ޮൣғ w weekdayOrdinalͱyearForWeekOfYear͸ௐ΂͖Εͳ͔ͬͨ w weekdayOrdinal ͸ɺ༗ޮൣғ಺ͱࢥΘΕΔ஋Ͱ΋Ϋϥογϡͨ͠Γॲཧ͕ࢭ·ͬͨΓ͢Δ

w ϢϦ΢ε೔͔ΒTXJGUGPVOEBUJPO͕نఆ͢Δ࣌఺·Ͱ w طଘ࣮૷ͱͷޓ׵ੑͷͨΊʁ w d Date(timeIntervalSinceReferenceDate: -211845067200.0)…

date(byAdding:value:to:wrappingComponents:) componentx value ͷ༗ޮൣғ component era, year, month, day, hour,

date(byAdding:value:to:wrappingComponents:) w ϢϦ΢ε೔͔ΒTXJGUGPVOEBUJPO͕نఆ͢Δ࣌఺·Ͱ w d Date(timeIntervalSinceReferenceDate: -211845067200.0)… Date(timeIntervalSinceReferenceDate:

date(byAdding:value:to:wrappingComponents:) w ݁ՌʹӨڹ͠ͳ͍ wrappingComponents

• date(bySetting:value:for:) -> Date? • date(byAdding:value:to:wrappingComponents:) -> Date? w υΩϡϝϯςʔγϣϯ͔Β͸ɺOJM͕ฦ͞ΕΔ৚͕͍݅·͍ͪΘ͔Βͳ͍

value ʹ .max Λ౉͢ͱɺ date(byAdding:…)ͷ৔߹͸ɺdate ͷ஋͕ͦͷ··ฦ͞ΕΔ date(bySetting:…)ͷ৔߹͸ɺnil ͕ฦ͞ΕΔ