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構造的差分ライブラリ開発時の悲劇・喜劇
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Kuniwak
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October 13, 2017
Programming
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構造的差分ライブラリ開発時の悲劇・喜劇
https://iosdc-reject-conference.connpass.com/event/64175/
Kuniwak
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October 13, 2017
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Transcript
ߏతࠩϥΠϒϥϦ ։ൃ࣌ͷ൵ܶتܶ σόοάΛॿ͚Δ
ߏతͳࠩͱԿ͔ ·ͣ
func testExample1() { let a = Example( key1: "I'm not
changed", key2: "I'm deleted" ) let b = Example( key1: "I'm not changed", key2: "I'm inserted" ) XCTAssertEqual(a, b) } Α͋͘ΔTUSVDUͷൺֱ
XCTAssertEqual failed: ("Example(key1: "I\'m not changed", key2: "I\'m deleted")") is
not equal to ("Example(key1: "I\'m not changed", key2: "I\'m inserted")") - ςετ݁ՌඇৗʹΘ͔ΓͮΒ͍
IUUQHJUIVCDPN,VOJXBL.JSSPS%J⒎,JU ͦ͜Ͱ
import MirrorDiffKit func testExample2() { let a = Example( key1:
"I'm not changed", key2: "I'm deleted" ) let b = Example( key1: "I'm not changed", key2: "I'm inserted" ) XCTAssertEqual(a, b, diff(between: a, and: b)) } ࣦഊ࣌ͷϝοηʔδʹ .JSSPS%J⒎,JUͷEJ⒎Λࢦఆ .JSSPS%J⒎,JUΛJNQPSU
struct Example { key1: "I'm not changed" - key2: "I'm
deleted" + key2: "I'm inserted" } ͜Ε͕ߏతͳࠩ ͙͢ʹࠩҟ͕Θ͔Γ·͢
[ "I'm not changed" "I'm not changed" - "I'm deleted"
"I'm not changed" + "I'm inserted" ] ྻͷॱংมߋͳͲ ߏతͳࠩͰ͢ ͜Εݟ͘͢දࣔ͞Ε·͢
IUUQHJUIVCDPN,VOJXBL.JSSPS%J⒎,JU ΑΖ͓͘͠ئ͍͠·͢
Έͷղઆ ࠩܭࢉͷ
let example = Example( key1: "I'm not changed", key2: "I'm
deleted" ) let hint = ( subject: Example.self, displayStyle: .struct, children: [ (label: "key1", value: "I'm not changed"), (label: "key2", value: "I'm deleted"), ] ) ߏతͳࠩͷܭࢉʹɺ ࣍ͷΑ͏ͳΦϒδΣΫτͷ ߏͷώϯτ͕ෆՄܽͰ͢ ΦϒδΣΫτͷܕ ΦϒδΣΫτͷछྨ ϓϩύςΟͷ໊લͱ
ͦͷػೳΛ୲͏ͷ͕.JSSPS ʢඪ४ϥΠϒϥϦͷ"1*Ͱ͢ʣ
let example = Example( key1: "I'm not changed", key2: "I'm
deleted" ) let mirror = Mirror(reflecting: example) let hint = ( subject: mirror.subjectType, displayStyle: mirror.displayStyle, children: mirror.children ) ௐ͍ͨΦϒδΣΫτ͔Β .JSSPSΦϒδΣΫτΛ ࡞͢Δͱɺ ܕใΦϒδΣΫτͷछྨɺ ϓϩύςΟͷ໊લͱͳͲΛ ೖखͰ͖·͢
.JSSPS%J⒎,JUɺ ͜ͷ.JSSPSΛͬͯ ࣮ݱ͞Ε͍ͯ·͢
͍ΖΜͳ͜ͱ͕Ͱ͖ͦ͏Ͱ ເͷ͕Δ"1*Ͱ͢Ͷ
تܶ͜͜·Ͱͩ
͍OJM͕͍ ൵ܶͦͷ
struct Example { let any: Any? } let example =
Example(any: nil) if let first = Mirror(reflecting: example) .children.first { print(first.value) } ϓϩύςΟΛOJMͰॳظԽ ϓϩύςΟͷΛݟΔͱɺ ઌ΄ͲOJMͰॳظԽͨ͠ͷͰ OJMʹͳ͍ͬͯΔ "OZ ͷϓϩύςΟ͕͋ΔTUSVDU .JSSPSΛ࡞ͯ͠ɺTUSVDUͷ ϓϩύςΟͷώϯτΛೖख
struct Example { let any: Any? } let example =
Example(any: nil) if let first = Mirror(reflecting: example) .children.first { print(first.value == nil) print(first.value) } GBMTF OJMͰ͔֬ΊͯΈΑ͏ ͔͠͠ೖ͍ͬͯΔͷOJMʜ
ߟฤ ൵͠Έͷ
"OZʹ ͳΜͰೖΔ ᶃ Int String Bool Any
0QUJPOBM ೖΕΒΕΔ ᶄ Optional<T> Any
͢ΔͱOJM ೖΓ͏Δ ᶄ nil Any
ᶄ nil Any == nil GBMTF
let x: Any? = nil let wrapper: Any = x
// WARNING: Comparing non-optional value of // type 'Any' to nil always returns false print(x == nil) ࣮ղઆͨ͠ྫΛίʔυʹ͢Δͱܯࠂ͕ग़Δ ʮ0QUJPOBM͡Όͳ͍ͱOJMΛ ɹൺֱͯ͠ৗʹGBMTFͩΑʯ
ͭ·Γɺ"OZʹOJMΛ ೖΕͯͳΒͳ͍ͷͰ͢
͔͠͠ɺ.JSSPSͰऔಘͨ͠ ϓϩύςΟͷͷܕ ແ༻Ͱ"OZͱ͍͏൵͠Έ ͳͷͰɺϓϩύςΟʹOJMΛͭ ΦϒδΣΫτΛ.JSSPSʹ͔͚Δͱ Ϋϥογϡͷةݥ͕͋Γ·͢
.JSSPS%J⒎,JUͰ͜ͷʹ ରॲ͍ͯ͠·͢ͷͰ҆͝৺Λʜ
ཁૉͷUVQMF ൵ܶͦͷ
enum Example { case zero case one(key: String) case two(key1:
String, key2: String) } 4XJGUͰFOVNͷDBTFʹଐ͢ΔΛఆٛͰ͖·͢ ͜ͷଐ͢ΔBTTPDJBUFEWBMVFTͱݺΕ͍ͯ·͢
enum Example { case one(key: String) case two(key1: String, key2:
String) } func test() { let x1: Example = .one(key: "value") let x2: Example = .two(key1: "value1", key2: "value2") let mirror1 = Mirror(reflecting: x1) let mirror2 = Mirror(reflecting: x2) dump(mirror1.children.first!.value) dump(mirror2.children.first!.value) } ͦΕͧΕΛ.JSSPSʹ͔͚·͢ ͜͜ͰBTTPDJBUFEWBMVFTͷ ཁૉ͕ҟͳΔͭͷDBTFΛ ఆٛ͠·͢ BTTPDJBUFWBMVFTɺ TUSVDUͷϓϩύςΟͱ ಉ͡Α͏ʹDIJMESFOͰ දݱ͞Ε·͢ ͦΕͧΕͷDIJMESFOΛ ֬ೝͯ͠Έ·͠ΐ͏
enum Example { case one(key: String) case two(key1: String, key2:
String) } func test() { let x1: Example = .one(key: "value") let x2: Example = .two(key1: "value1", key2: "value2") let mirror1 = Mirror(reflecting: x1) let mirror2 = Mirror(reflecting: x2) dump(mirror1.children.first!.value) dump(mirror2.children.first!.value) } BTTPDJBUFEWBMVFT͕ ͭͷ߹ WBMVF ͭͷ߹ LFZWBMVF LFZWBMVF ܕ͕ҧ͏
ߟฤ ൵͠Έͷ
let y: Any = (number: 123) print(type(of: y)) ܕΛௐͯΈΔͱ
*OU ຊBTTPDJBUFEWBMVFTͷཁૉ͕ ͍ͭ͘Ͱ͋ΕɺDIJMESFOͷܕUVQMFʹ ͔ͨͬͨ͠ͷͰͱਪଌ ͔͠͠ɺཁૉͷ͚࣌ͩࣄ͕͋ͬͯ UVQMFʹͰ͖ͳ͔͔ͬͨ͠Εͳ͍ͷͰɺ ࢼ͠ʹཁૉ͕ͭͷUVQMFΛ࡞ͯ͠ΈΔ UVQMFͰͳ͍
// Error: cannot create a single-element tuple with // an
element label let x: (number: Int) = (number: 123) let y: Any = (number: 123) print(type(of: y)) // Int ࣮ɺ4XJGUͷܕͰཁૉ͕ͭͷUVQMFఆٛͰ͖ͳ͍ ͔͠͠ɺཁૉͷUVQMFܕ͕ ࡞Εͳ͍͚ͩͳͷͰɺܕΛ "OZʹͯ͠͠·͑ཁૉͷ UVQMFΒ͖͠ͷΛఆٛͰ͖Δ ͔͠͠ɺఆٛͰ͖ͨͱͯ͠ɺ ͦͷܕཁૉͷதͷܕʹ ͳΔΑ͏ͩ ͭ·ΓɺཁૉͷUVQMF ଘࡏͰ͖ͳ͍͜ͱ͕Θ͔Δ
ཁૉͷUVQMFܕଘࡏͰ͖ͳ͍ͷͰɺ ຊདྷUVQMFͰ͋Δͣͷ BTTPDJBUFEWBMVFT͕ɺཁૉͷ ͱ͖ʹத͚ͩʹͳΔͷͰͨ͠ʜ
.JSSPS%J⒎,JUͰ͜ͷʹ ରॲ͍ͯ͠·͢ͷͰ҆͝৺Λʜ
ΧδϡΞϧʹյΕΔ ൵ܶͦͷ
·ͱΊ w .JSSPSͱ͍͏TUSVDUͳͲͷߏΛ ௐΔͨΊͷ"1*͕͋Γ·͢ w ৭ʑͰ͖ͦ͏Ͱເ͕͕Γ·͢ w ͔͠͠ɺ͔ͳΓͷͭΒΈ͕͋Γ·͢ͷͰ ͍ͬͯ͘ࡍʹ.JSSPS%J⒎,JUͷ ճආྫΛࢀߟʹ͢ΔͱΑ͍Ͱ͠ΐ͏