Kotlin Compiler Pluginで実現するCustom String Interpolation

by Ryosuke Hasebe

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!CF@IBTFF ,PUMJO$PNQJMFS1MVHJOͰ࣮ݱ͢Δ $VTUPN4USJOH*OUFSQPMBUJPO ,PUMJO'FTU

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ࣗݾ঺հ w ௕୩෦ྑี w 9!CF@IBTFF w (JU)VC!CFIBTF w αʔόʔαΠυΤϯδχΞ w ೥͔Β+BWB ೥͔Β,PUMJOΛαʔόʔαΠυͷ։ൃͰར༻͍ͯ͠·͢ w ෦෼తʹ͸೥͔Β,PUMJOΛ࢖͍ͬͯ·ͨ͠

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ຊ೔ͷηογϣϯͷΞδΣϯμ ,PUMJOͱଞݴޠͷจࣈྻิؒʹ͍ͭͯ ,PUMJO$PNQJMFS1MVHJOʹ͍ͭͯ ,PUMJO$PNQJMFS1MVHJOΛ࢖ͬͯจࣈྻิؒΛΧελϚΠζ͢Δ ࣮ྫ,VFSZ$MJFOUͷ঺հ

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,PUMJOͱଞݴޠͷจࣈྻิؒʹ͍ͭͯ

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,PUMJOͷจࣈྻิؒ 4USJOH*OUFSQPMBUJPO w จࣈྻิؒͱ͸ɺจࣈྻͷதʹม਺΍ࣜΛຒΊࠐΊΔ࢓૊Έ w ,PUMJOͰ͸ɺ΍\^Λ࢖ͬͯهड़ جຊͷΩ

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,PUMJOͷจࣈྻิؒ 4USJOH*OUFSQPMBUJPO w ΋ͪΖΜෳ਺ߦจࣈྻͷͱ͖Ͱ΋ ࢖༻Ͱ͖Δ ෳ਺ߦจࣈྻͷέʔε

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༨ஊ ͸͡Ίͯ,PUMJOΛ࢖ͬͨΩοΧέ w +BWB࣌୅ɺෳ਺ߦจࣈྻ ςΩετ ϒϩοΫ ͕+BWBʹ͸ͳ͔ͬͨ w +BWB͔Βొ৔ w .Z#BUJT"OOPUBUJPOʹෳ਺ߦจࣈྻ Λ࢖͏ͨΊʹ෦෼తʹ,PUMJOΛ࠾༻

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,PUMJOͰ͸ݱঢ়ɺจࣈྻิ׬ΛΧεϚΠζ͢Δ͜ͱ͸Ͱ͖ͳ͍ w จࣈྻิ׬ͷΧελϚΠζͱ͸ɺྫ͑͹͜͏͍͏ػೳͷ͜ͱ

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ଞͷݴޠͷྫ+BWB4DSJQUͷ5BHHFE5FNQMBUFT

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ଞͷݴޠͷྫ+BWB4DSJQUͷ5BHHFE5FNQMBUFT POF\B^UXP\C^UISFF <POF UXP UISFF> <\B^ \C^>

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ଞͷݴޠͷྫ4DBMBͷ$VTUPN*OUFSQPMBUPST

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ଞͷݴޠͷྫ+&14USJOH5FNQMBUFT w +BWB͔ΒϓϨϏϡʔͱͯ͠ ొ৔͕ͨ͠ɺ+BWB͔Β ͠Εͬͱফ͑ͨ

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ຊ౰ʹ,PUMJOͰจࣈྻิؒΛΧελϚ Πζ͢Δ͜ͱ͸Ͱ͖ͳ͍ͷ͔ʁ

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,PUMJO$PNQJMFS1MVHJOΛ ࢖͑͹Ͱ͖Δʂ

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,PUMJO$PNQJMFS1MVHJOͱ͸ w ,PUMJO$PNQJMFSΛ֦ு͠ɺݴޠͷηϚϯςΟΫεΛมߋͰ͖Δػೳ w ͨͩ͠ɺ࣮ݧత͔ͭෆ҆ఆͳ"1* w ୯७ͳίʔυੜ੒ͳΒɺ,41 ,PUMJO4ZNCPM1SPDFTTJOH Λ࢖ͬͨ΄͏͕ ͍͍

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,PUMJO$PNQJMFS1MVHJOͷྫ+FU#SBJOTެࣜ w /PBSH w ಛఆΞϊςʔγϣϯ෇͖ΫϥεʹҾ਺ͳ͠ίϯετϥΫλΛࣗಈੜ੒ IUUQTLPUMJOMBOHPSHEPDTOPBSHQMVHJOIUNM w "MMPQFO w ಛఆΞϊςʔγϣϯ෇͖ΫϥεΛࣗಈతʹPQFOԽ IUUQTLPUMJOMBOHPSHEPDTBMMPQFOQMVHJOIUNM w LPUMJOYTFSJBMJ[BUJPO w 4FS%Fίʔυͷੜ੒ IUUQTHJUIVCDPN,PUMJOLPUMJOYTFSJBMJ[BUJPO w 1PXFSBTTFSU w ΞαʔγϣϯϨϙʔτΛڧԽ IUUQTLPUMJOMBOHPSHEPDTQPXFSBTTFSUIUNM

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,PUMJO$PNQJMFS1MVHJOͷྫSEQBSUZ w ,41 ,PUMJO4ZNCPM1SPDFTTJOH w ܰྔͰߴ଎ͳίϯύΠϥϓϥάΠϯ։ൃΛ࣮ݱ IUUQTHJUIVCDPNHPPHMFLTQ w .PLLFSZ w ,PUMJO.VMUJQMBUGPSN༻ͷϞοΫϥΠϒϥϦ IUUQTHJUIVCDPNMVQVVTT.PLLFSZ w .BQQJF w ߴੑೳͳΦϒδΣΫτϚοϐϯάΛࣗಈੜ੒͢Δ,PUMJO.VMUJQMBUGPSNϓϥάΠϯ IUUQTHJUIVCDPN.S.BQQJFNBQQJF

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,PUMJO$PNQJMFS LU DMBTT KT TP ,PUMJO$PNQJMFS

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,PUMJO$PNQJMFS ύʔεղੳ౳ ग़ྗ LU DMBTT KT 'SPOUFOE #BDLFOE '*3 ʜ *3 ʜ TP '*3'SPOUFOE*OUFSNFEJBUF3FQSFTFOUBUJPO *3*OUFSNFEJBUF3FQSFTFOUBUJPO

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,PUMJO$PNQJMFS ύʔεղੳ౳ ग़ྗ LU DMBTT KT 'SPOUFOE #BDLFOE '*3 ʜ *3 ʜ TP '*3'SPOUFOE*OUFSNFEJBUF3FQSFTFOUBUJPO *3*OUFSNFEJBUF3FQSFTFOUBUJPO $PNQJMFS1MVHJOΛ༻͍Δͱɺ 'SPOUFOE͕ੜ੒͢Δ'*3ͱ#BDLFOE͕ੜ੒͢Δ*3Λ֦ு͢Δ͜ͱ͕Ͱ͖·͢

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'*3֦ுͱ*3֦ுͷҧ͍ w '*3֦ுΛ࢖༻͢Δέʔε w ੩తղੳ w *3֦ுΛ࢖༻͢Δέʔε w ίʔυͷੜ੒มߋ w ϥϯλΠϜ࣌ͷڍಈมߋ w จࣈྻิؒΛΧελϚΠζ͢Δ৔߹͸*3֦ு

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ΑΓৄࡉʹ஌Γ͍ͨ৔߹ w ΋ͬͱ,PUMJOΛ޷͖ʹͳΔʂ,࣌୅ͷ,PUMJO$PNQJMFS1MVHJO։ൃ IUUQTXXXZPVUVCFDPNXBUDI W,F2ZB-'@" ,PUMJO'FTU w 8SJUJOH:PVS5IJSE,PUMJO$PNQJMFS1MVHJO IUUQTXXXZPVUVCFDPNXBUDI W1R6(J@HD ,PUMJO$POG w 8SJUJOHB,PUMJO$PNQJMFS1MVHJO IUUQTXXXZPVUVCFDPNXBUDI W7S*4;J,H

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,PUMJO$PNQJMFS1MVHJOΛ࢖ͬͯ จࣈྻิؒΛΧελϚΠζ͢Δ

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΍Γ͖ͨ͜ͱΰʔϧ ࣮ߦ݁Ռ

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΍Γ͖ͨ͜ͱΰʔϧ ࣮ߦ݁Ռ

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΍Γ͖ͨ͜ͱΰʔϧ ࣮ߦ݁Ռ

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΍Γ͖ͨ͜ͱΰʔϧ ࣮ߦ݁Ռ

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ࠓճ࡞Δ$PNQJMFS1MVHJOʹ͍ͭͯ w ίʔυશମ͸ͪ͜Βʹެ։͍ͯ͠·͢ w IUUQTHJUIVCDPNCFIBTFLPUMJOGFTU w ࠓճ͸࠷খߏ੒Ͱ࡞੒͠·͢ w ࣮ࡍ͸ɺ(SBEMF1MVHJOͱͯ͠ఏڙ͢Δ͜ͱ͕Ұൠత

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w ▶DPNQJMFSQMVHJO w ▶FYBNQMF

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w ˝DPNQJMFSQMVHJO w CVJMEHSBEMFLUT w TSDNBJO w LPUMJO w QMVHJO w 4RM*OUFSQPMBUJPO$PNQJMFS 1MVHJO3FHJTUSBSLU w 4RM*OUFSQPMBUJPO*S(FOFSBUJ PO&YUFOTJPOLU w 4RM*OUFSQPMBUJPO5SBOTGPS NFSLU w SFTPVSDFT w .&5"*/'TFSWJDFT w PSHKFUCSBJOTLPUMJODPNQJM FSQMVHJO$PNQJMFS1MVHJO3 FHJTUSBS w ▶FYBNQMF

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w ▶DPNQJMFSQMVHJO w ˝FYBNQMF w CVJMEHSBEMFLUT w TSDNBJOLPUMJOFYBNQMF w .BJOLU

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w ▶DPNQJMFSQMVHJO w ˝FYBNQMF w CVJMEHSBEMFLUT w TSDNBJOLPUMJOFYBNQMF w .BJOLU w LPUMJO$PNQJMFS1MVHJO$MBTTQBUIDPO fi HVSBUJPOΛ࢖ͬͯɺ DPNQJMFSQMVHJOQSPKFDUʹґଘͤ͞Δ

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w ▶DPNQJMFSQMVHJO w ˝FYBNQMF w CVJMEHSBEMFLUT w TSDNBJOLPUMJOFYBNQMF w .BJOLU w ࠶ܝ

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*3&MFNFOU5SFF

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*3&MFNFOU5SFF

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*S&MFNFOU5SBOTGPSNFS w 7JTJUPSύλʔϯͰ *3&MFNFOU5SFFΛ૸ࠪ w ೚ҙͷ*3&MFNFOUΛมߋͰ͖Δ

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վม͍ͨ͠ιʔείʔυ

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վม͍ͨ͠*3&MFNFOU *S$BMM TRMGVODUJPOݺͼग़͠ ͱ *S$POTU Ҿ਺ͷจࣈྻϦςϥϧ Λมߋ͍ͨ͠

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վม͍ͨ͠*3&MFNFOU *S$BMM TRMGVODUJPOݺͼग़͠ ͱ *S4USJOH$PODBUFOBUJPO Ҿ਺ͷจࣈྻิؒ Λมߋ͍ͨ͠

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׬੒

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࣮ߦ͢Δͧ

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ಈ͍ͨ

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5JQTDPNQJMFSQMVHJOUFNQMBUF w ެࣜͰఏڙ͍ͯ͠Δ5FNQMBUF3FQPTJUPSZ w IUUQTHJUIVCDPN,PUMJODPNQJMFSQMVHJOUFNQMBUF

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5JQTLPUMJODPNQJMFUFTUJOH w IUUQTHJUIVCDPN;BD4XFFST LPUMJODPNQJMFUFTUJOH w 6OJU5FTUͰίϯύΠϧͷςετ͕Ͱ͖Δ w *%&"ͷ%FCVHHFSΛࢗͯ͠ݕূͰ͖Δͷ Ͱศར

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5JQT'*35SFF*%&"1MVHJO IUUQTQMVHJOTKFUCSBJOTDPNQMVHJO fi SUSFF

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5JQTLPUMJOJSFYQMPSFS IUUQTHJUIVCDPNZBJSNLPUMJOJSFYQMPSFS

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࣮ྫ,VFSZ$MJFOUͷ঺հ IUUQTLVFSZDMJFOUITCSZTLEFW

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,VFSZ$MJFOUͷ֓؍ w VOBSZ1MVT Λ࢖ͬͯɺ42-Λ૊ΈཱͯΔ w ಈతʹ42-Λߏங͍ͨ࣌͠͸ɺJGGPS౳Λ࢖͏ w ಈతʹ૊ΈཱͯΔඞཁ͕ͳ͍ͳΒɺώΞυΩϡ ϝϯτͰϕλॻ͖ w ม਺஋ΛຒΊࠐΈ͍ͨ࣌͸ɺจࣈྻิؒΛར༻ MJTU

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༨ஊ LPUMJOYIUNM

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#BTFEPOTQSJOHEBUBKECDPSTQSJOHEBUBSECD w ,VFSZ$MJFOU͸42-ˍύϥϝʔλͷ ߏங͕ओͳ໾ׂ w େࣄͳ෦෼͸޿͘࢖ΘΕ͍ͯΔ TQSJOHEBUB͕୲౰ w +%#$3%#$྆ํʹରԠ w 3%#$ͷ৔߹͸TVTQFOEGVOʹͳΔ ,VFSZ$MJFOU TQSJOHEBUBKECD TQSJOHEBUBSECD +%#$ 3%#$ 3FMBUJPOBM%BUBCBTF 42-ύϥϝʔλ 42-ύϥϝʔλ

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'FBUVSFT w 5SBOTBDUJPO w 5ZQF$POWFSTJPO w 0CTFSWBUJPO 4QSJOHͷ!5SBOTBDUJPOBM͕࢖͑Δ

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'FBUVSFT w 5SBOTBDUJPO w 5ZQF$POWFSTJPO w 0CTFSWBUJPO 4QSJOHͷ5ZQF$POWFSTJPO͕࢖͑Δ

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'FBUVSFT w 5SBOTBDUJPO w 5ZQF$POWFSTJPO w 0CTFSWBUJPO w .JDSPNFUFS0CTFSWBUJPOʹରԠ w ˠ.FUSJDT 5SBDJOH -PHHJOHʹରԠ

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͓ΘΓ Έͳ͞Μ΋ྑ͔ͬͨΒੋඇɺศརͰ໘ന͍$PNQJMFS1MVHJOΛ࡞ͬͯΈ͍ͯͩ͘͞ʂ ,PUMJOΛѪͰ͍͍͖ͯ·͠ΐ͏