Rangeと仲良くなる15分 with String.Index & Unicode

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ࢿྉΛ࡞͍ͬͯͯൃ֮

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String.Indexͱ஥ྑ͘ͳΒͳ͍ͱ Rangeͱ஥ྑ͘Ͱ͖ͳ͍

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Copyright © 2017 eureka, Inc. All rights reserved. 7 ͜ͷSessionͷ໨ඪ จࣈྻૢ࡞࣌ͷ3BOHFͱ஥ྑ͘ͳΔ ଟ෼3BOHFͱ஥ྑ͘ͳΕͳ͍ͷ͸จࣈྻૢ࡞ͷ͍ͤ Կނ3BOHFͱ4USJOH ओʹ4USJOH*OEFY Λ࢖͏ͱਏ͍ͷ͔ 4XJGUͱ/4ʹ͓͚Δ6OJDPEFͷجૅʹ͍ͭͯཧղ͢Δ 4XJGUͱ4XJGUʹ͓͚Δɺ3BOHFΛ࢖ͬͨจࣈྻૢ࡞ͷͭ·͖ͮϙΠ ϯτΛ֬ೝ͢Δ

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ʊਓਓਓਓਓਓਓਓਓਓʊ ʼ3BOHFͱ஥ྑ͘ͳΔʻ ʉ:?:?:?:?:?:?:?:?ʉ

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Copyright © 2017 eureka, Inc. All rights reserved. 12 Countable or UnCountable ? // Countable let countableRange1 = 0...0 let countableRange2 = 10..<100 // UnCountable let unCountableRange1 = 0.2...19.5 let unCountableRange2 = 0..<20.0

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Copyright © 2017 eureka, Inc. All rights reserved. 13 Countable or UnCountable ? // Countable let countableRange1 = 0...0 let countableRange2 = 10..<100 // UnCountable let unCountableRange1 = 0.2...19.5 let unCountableRange2 = 0..<20.0

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Copyright © 2017 eureka, Inc. All rights reserved. 14 Countable or UnCountable ? $PVOUBCMF4USJEFBCMFQSPUPDPMʹ४ڌ͍ͯ͠Δ͔ 4USJEFBCMF4USJEF4JHOFE*OUFHFS *OUࠁΈͰલޙૢ࡞ՄೳͰ͋Δ͔ʁ 'MPBU %PVCMFͳͲͷ৔߹͸ࠁΉࣄ͕Ͱ͖ͳ͍ͷͰɺ$PVOUBCMF3BOHFʹ Ͱ͖ͳ͍ *OU 'MPBUˡXIBU`TOFYU

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Copyright © 2017 eureka, Inc. All rights reserved. 15 Range or ClosedRange (ด۠ؒ or ൒։۠ؒ)? // Range(半開区間) let range1 = 0..<10 let range2 = 0.0..<10.0 // ClosedRange(閉区間) let closedRange1 = 0...10 let closedRange2 = 0.0...10.0

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Copyright © 2017 eureka, Inc. All rights reserved. 16 Range or ClosedRange (ด۠ؒ or ൒։۠ؒ)? // Range(半開区間) let range1 = 0..<10 let range2 = 0.0..<10.0 // ClosedRange(閉区間) let closedRange1 = 0...10 let closedRange2 = 0.0...10.0

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Copyright © 2017 eureka, Inc. All rights reserved. 17 Range or ClosedRange (ด۠ؒ or ൒։۠ؒ)? $MPTFE3BOHFVQQFS#PVOE3BOHFVQQFS#PVOE ӈͷ୺఺ΛؚΉ͔൱͔ ൒։۠ؒͷΈۭ۠ؒΛද͢ࣄ͕Մೳ ด۠ؒͷΈ#PVOEͷ࠷େ஋Λൣғ಺ʹؚΉ3BOHFΛఆٛՄೳ DPOUBJOT *OUNBY

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Copyright © 2017 eureka, Inc. All rights reserved. 19 Swift 4 - PartialRange ࠨӈ͍ͣΕ͔ͷ୺఺ #PVOE ͕ଘࡏ͠ͳ͍3BOHF let range1 = 0... // CountablePartialRangeFrom let range2 = 0.5... // PartialRangeFrom let range3 = ...100 // PartialRangeThrough let range4 = ..<100.0 // PartialRangeUpTo

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Copyright © 2017 eureka, Inc. All rights reserved. 20 Swift 4 - PartialRange let target = 50 switch target { case 100...: print("greater than 100") case ..<100: print("less than 100") default: print(“default") } // > less than 100

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Copyright © 2017 eureka, Inc. All rights reserved. 24 slice String let array = ["❤", "#", "❤", "$", "%", "&"] let familyLove = array[1...2] // ["#", “❤"] let string = "あのイーハトーヴォのすきとおった風" let targetStart = string.index(string.startIndex, offsetBy: 2) let targetEnd = string.index(string.startIndex, offsetBy: 9) let substring2 = string[targetStart..

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Copyright © 2017 eureka, Inc. All rights reserved. 25 slice String let array = ["❤", "#", "❤", "$", "%", "&"] let familyLove = array[1…2] // ["#", “❤"] let string = "あのイーハトーヴォのすきとおった風" let targetStart = string.index(string.startIndex, offsetBy: 2) let targetEnd = string.index(string.startIndex, offsetBy: 9) let substring2 = string[targetStart..

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Copyright © 2017 eureka, Inc. All rights reserved. 29 why String.Index? lߴίετͳॲཧͰ͋Δ͜ͱΛҙࣝͤ͞ɺ͔ͭޮ཰ͷྑ͍ཁૉΞΫηε͕Մ ೳͳ"1*ͱͳ͍ͬͯΔ͜ͱz ʮ4XJGUͷ4USJOHͷ7JFXʹରͯ͠ɺ*OUͰTVCTDSJQUग़དྷͳ͍ཧ༝ʯ !@NPOPTBO͔ΒҾ༻ *1 https://medium.com/swift-column/swift-string-7147f3f496b1

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Copyright © 2017 eureka, Inc. All rights reserved. 33 Unicodeͷجૅ Character View let string = "résumé〜" string.utf8.count // 15 string.utf16.count // 9 string.unicodeScalars.count // 8 string.characters.count // 8 (string as NSString).length // 9

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Copyright © 2017 eureka, Inc. All rights reserved. 37 ʮ1จࣈʯͱ͸ Ϣʔβ͕ೝࣝ͢Δʮจࣈʯ͸ɺ6OJDPEFͷίʔυϙΠϯτ͕ෳ਺૊Έ߹Θ ͤͯߏ੒͞ΕΔࣄ΋͋Δ ίʔυϙΠϯτΛҰఆͷج४Ͱ·ͱΊΔϩδοΫ͕ڥքΞϧΰϦζϜ #PVOEBSJFT"MHPSJUIN ڥքΞϧΰϦζϜʹΑͬͯϢʔβ͕Ұจࣈͱͯ͠ೝࣝ͢Δ͋ͭ·ΓΛఆٛ ͨ͠΋ͷ͕ॻهૉΫϥελ (SBQIFNF$MVTUFST

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Copyright © 2017 eureka, Inc. All rights reserved. 39 ֦ுॻهૉΫϥελ ڥքϧʔϧ 1. ςΩετ͕ۭͰͳ͍ݶΓɺςΩετͷઌ಄ͱ࠷ޙ͸ڥքʹͳΔ 2. CRͱLFͷؒ͸ڥքʹͳΒͳ͍ɻ΋͘͠͸ɺControlɺCRɺLFͷલޙΛڥքʹ͢Δ 3. ϋϯάϧͷԻઅγʔέϯε͕ଓ͘৔߹͸ڥքʹͳΒͳ͍ 4. ZWJ΍֦ுΩϟϥΫλͷલ͸ڥքʹͳΒͳ͍ 5. SpacingMarkͷલɺ΋͘͠͸ઌ಄௥Ճจࣈͷޙ͸ڥքʹͳΒͳ͍ 6. Emoji Modiﬁer Sequenceɺ΋͘͠͸ZWJΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 7. ࠃضֆจࣈΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 8. ্هͷ৚݅ʹؚ·Εͳ͍৔߹ɺڥքʹͳΔ http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries

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Copyright © 2017 eureka, Inc. All rights reserved. 40 ֦ுॻهૉΫϥελ ڥքϧʔϧ 1. ςΩετ͕ۭͰͳ͍ݶΓɺςΩετͷઌ಄ͱ࠷ޙ͸ڥքʹͳΔ 2. CRͱLFͷؒ͸ڥքʹͳΒͳ͍ɻ΋͘͠͸ɺControlɺCRɺLFͷલޙΛڥքʹ͢Δ 3. ϋϯάϧͷԻઅγʔέϯε͕ଓ͘৔߹͸ڥքʹͳΒͳ͍ 4. ZWJ΍֦ுΩϟϥΫλͷલ͸ڥքʹͳΒͳ͍ 5. SpacingMarkͷલɺ΋͘͠͸ઌ಄௥Ճจࣈͷޙ͸ڥքʹͳΒͳ͍ 6. Emoji Modiﬁer Sequenceɺ΋͘͠͸ZWJΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 7. ࠃضֆจࣈΛؚΉ৔߹͸ڥքʹͳΒͳ͍ 8. ্هͷ৚݅ʹؚ·Εͳ͍৔߹ɺڥքʹͳΔ http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries ཁ͢ΔʹΊΜͲ͍ʂ

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Copyright © 2017 eureka, Inc. All rights reserved. 43 NSString slice // 1文字目を取得する let string = "こんにちは！" let startIndex = string.startIndex let endIndex = string.index(startIndex, offsetBy: 1) string[startIndex..

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Copyright © 2017 eureka, Inc. All rights reserved. 44 NSString substring // 1文字目を取得する let string = "こんにちは！" let startIndex = string.startIndex let endIndex = string.index(startIndex, offsetBy: 1) string[startIndex..

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Copyright © 2017 eureka, Inc. All rights reserved. 45 String.Index 65'ͷίʔυϙΠϯτͱͯ͠ʮʯ͸͕ͭͩɺ4USJOH*OEFY͸ॻهૉ ΫϥελΛߟྀ ͓ͦΒ͘಺෦తʹ͸65'ͰFODPEF*OEFYΛ͍࣋ͬͯΔ ந৅Խ͞Ε͍ͯΔҝɺ಺෦ͷ0⒎TFU͸ࠓޙҙຯ͕มΘΔՄೳੑ͕͋Δ let str = "" str.index(after: str.startIndex).encodedOffset == 2 // -> true

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Copyright © 2017 eureka, Inc. All rights reserved. 46 Swift 3ʹ͓͚ΔSwift.Range to NSRange let utf16String = string.utf16 let utf16StartPoisition = startIndex.samePosition(in: utf16String) let utf16EndPoisition = endIndex.samePosition(in: utf16String) let distance = utf16StartPoisition.distance(to: utf16EndPoisition) let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: distance))

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Copyright © 2017 eureka, Inc. All rights reserved. 47 Swift 3ʹ͓͚ΔSwift.Range > NSRange let utf16String = string.utf16 let utf16StartPoisition = startIndex.samePosition(in: utf16String) let utf16EndPoisition = endIndex.samePosition(in: utf16String) let distance = utf16StartPoisition.distance(to: utf16EndPoisition) let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: distance))

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Copyright © 2017 eureka, Inc. All rights reserved. 48 Swift 3ʹ͓͚ΔSwift.Range > NSRange let utf16String = string.utf16 let utf16StartPoisition = startIndex.samePosition(in: utf16String) let utf16EndPoisition = endIndex.samePosition(in: utf16String) let distance = utf16StartPoisition.distance(to: utf16EndPoisition) let nsString = string as NSString nsString.substring(with: NSRange(location: 0, length: distance)) // ""

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Copyright © 2017 eureka, Inc. All rights reserved. 57 Swift 4 supports Unicode 9 // 1文字目を取得 let emoji = “-家族" emoji.count // 3 let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex.. "-"

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Copyright © 2017 eureka, Inc. All rights reserved. 58 Swift 4 supports Unicode 9 // 1文字目を取得 let emoji = “-家族" emoji.count // 3 let startIndex = emoji.startIndex let endIndex = emoji.index(after: startIndex) emoji[startIndex.. "-" NFFUT6

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Copyright © 2017 eureka, Inc. All rights reserved. 59 Swift 4 SubString͕௥Ճ let string = "あのイーハトーヴォのすきとおった風" let targetStart = string.index(string.startIndex, offsetBy: 2) let targetEnd = string.index(string.startIndex, offsetBy: 9) let subString = string[targetStart..

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Copyright © 2017 eureka, Inc. All rights reserved. 60 Swift 4 - Substring 4XJGUͰ͸ɺ4USJOH͔ΒTMJDF͞Εͨจࣈྻ͸4USJOHͰ͸ͳ͘ɺ4VCTUSJOH 5ZQFͱͳΔ จࣈྻεϥΠεͷύϑΥʔϚϯε޲্ ྆5ZQFڞ4USJOH1SPUPDPMΛ࣮૷͍ͯ͠Δҝɺ΄΅ಉ͡ڍಈ TUBSU*OEFYɺFOE*OEFY͕ݩͷ4USJOHͷ*OEFYΛอ͍࣋ͯ͠Δҝɺ஫ҙ͕ඞ ཁ