Kotlinとずっと一緒にいたい話 with Kotlin Scripting

Transcript

1. Kotlin ͱ
   ͣͬͱҰॹʹ͍͍ͨ࿩
   with Kotlin Scripting
   LINE Fukuoka
   അݟ ੣ @umakoz
   Coroutine ϋϯζΦϯ by DroidKaigi @ LINE Fukuoka
   

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2. About me
   • LINE Fukuoka
   • അݟɹ੣ʢumami makotoʣ
   • @umakoz
   •
   !
   3°02'03"
   • LINE Creators Studio
   

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3. KotlinͰ
   Android AppΛ
   ։ൃͯ͠·͔͢ʁ
   

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4. Kotlinͱ
   ͣͬͱ
   ཭Εͨ͘ͳ͍Ͱ͢ΑͶʂ
   

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5. ͔͠͠ɺಥવͷKotlin࢖͍ʹ͍͘Ҋ݅
   Excel fileΛಡΈࠐΜͰɺ
   Kotlin code fileΛग़ྗ͢Δɻ
   ੜ੒ͨ͠fileΛAndroid appͰ࢖͏ɻ
   

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6. Command-line Tool΋
   KotlinͰॻ͖͍͕ͨɻɻɻ
   • Compile͢ΔͷΊΜͲ͍
   • Gradle commandʹ͢Δͷ΋ΊΜͲ͍
   

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7. Kotlin Scripting support
   • KotlinΛScriptݴޠͱͯ͠࢖͑ΔΑ͏ʹ͢Δ
   • command-line toolͱ͸REPLͳͲͷ༻్Λ૝ఆ͍ͯ͠Δ
   • https://github.com/Kotlin/KEEP/blob/master/proposals/
   scripting-support.md
   

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8. Preparation
   • Kotlin CLIΛinstall͢Δ
   • Kotlin 1.3.50લఏ
   $ brew install kotlin
   

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9. generate.main.kts overview
   Command-line͔Β࣮ߦ͢Δscript
   @file:Repository("https://jcenter.bintray.com")
   @file:DependsOn("org.apache.poi:poi-ooxml:4.1.0")
   @file:DependsOn("org.freemarker:freemarker:2.3.29")
   @file:Import("EventXlsxParser.kt")
   import freemarker.template.Configuration
   import ...
   val filePath = args[0]
   val events = EventXlsxParser().parse("${filePath}${File.separator}Events.xlsx")
   val configuration = Configuration(Configuration.getVersion()).apply {
   setDirectoryForTemplateLoading(File("./templates"))
   }
   val template = configuration.getTemplate("ActionEvent.ftl")
   val writer = FileWriter("${filePath}${File.separator}ActionEvent.kt")
   val data = hashMapOf("events" to events)
   template.process(data, writer)
   

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10. generate.main.kts note 1
    • ֦ுࢠΛ ".main.kts" ʹ͢Δ
    ".main"Λ͚ͭΔͱ file-level annotation ͕༗ޮʹͳΔ
    

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11. generate.main.kts note 2
    • file-level annotaionʹΑΓscriptػೳ֦ு͢Δ
    @file:ImportͰඞཁͳґଘ΋@file:DependsOnͰࢦఆ͢Δ
    // maven repository
    @file:Repository("https://jcenter.bintray.com")
    // 3rd-party library
    @file:DependsOn("org.apache.poi:poi-ooxml:4.1.0")
    @file:DependsOn("org.freemarker:freemarker:2.3.29")
    // import another Kotlin code
    @file:Import("EventXlsxParser.kt")
    

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12. generate.main.kts note 3
    • @file:ImportͰ͸Kotlin script΋source΋ಡΈࠐΊΔ
    scriptʹ͢Δͱɺmain͔Βimport fileͷclass͕ࢀরͰ͖ͳ͍
    // script
    @file:Import("EventXlsxParser.main.kts")
    // source
    @file:Import("EventXlsxParser.kt")
    

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13. EventXlsxParser.kt
    import java.nio.file.Paths
    import org.apache.poi.ss.usermodel.WorkbookFactory
    class EventXlsxParser {
    fun parseXlsx(filePath: String): List> {
    val file = Paths.get(filePath).toFile()
    val workbook = WorkbookFactory.create(file)
    val sheet = workbook.getSheet("Action")
    val keys = sheet.first().map { cell -> cell.stringCellValue }
    return sheet.rowIterator().asSequence().drop(1)
    .map { row ->
    keys.mapIndexed { index, key ->
    key to row.getCell(index).stringCellValue
    }.toMap()
    }
    .toList()
    }
    }
    

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14. generate.main.kts note 4
    • @file:paramͰscript parameterΛड͚औΕΔ͸͕ͣͩɺ
    ্ख͘ಈ࡞͠ͳ͔ͬͨʢݪҼ஌ͬͯͨΒڭ͍͑ͯͩ͘͞ ʣ
    // NG
    //@file:param("filePath", "String?")
    // OK
    val filePath = args[0]
    

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15. generate.main.kts note 5
    • ͋ͱ͸ී௨ͷcodeΛॻ͘
    val events = EventXlsxParser().parse("${filePath}${File.separator}Events.xlsx")
    val configuration = Configuration(Configuration.getVersion()).apply {
    setDirectoryForTemplateLoading(File("./"))
    }
    val template = configuration.getTemplate("ActionEvent.ftl")
    val writer = FileWriter("${filePath}${File.separator}ActionEvent.kt")
    val data = hashMapOf("events" to events)
    template.process(data, writer)
    

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16. ActionEvent.ftl
    sealed class ActionEvent(
    val type: String,
    val value: String
    ) {
    <#assign currentType = "">
    <#list events as event>
    <#if currentType != event.type>
    <#assign currentType = event.type>
    <#assign typeValues = events?filter(v -> v.type == currentType)>
    class ${currentType?cap_first} {
    <#typeValues as typeValue>
    object ${typeValue.value?cap_first} : ActionEvent("${typeValue.type}", "${typeValue.value}")
    #list>
    }
    #if>
    #list>
    }
    

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17. Execute
    • kotlin-main-kts-1.3.50.jarΛdownloadͯ͠
    scriptͱಉ͡folderʹஔ͘
    $ kotlinc \
    -cp ./kotlin-main-kts-1.3.50.jar \
    -script ./generate.main.kts \
    /path/to/file
    

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18. ActionEvent.kt
    sealed class ActionEvent(
    val type: String,
    val value: String
    ) {
    class Foo {
    object On : ActionEvent("bar", "on")
    object Off : ActionEvent("bar", "off")
    }
    }
    

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19. Kotlin script Pros
    1. Kotlin code͕scriptͱͯ͠ॻ͚Δ
    2. ໰୊ͳ࣮͘༻Ͱ͖ΔϨϕϧ
    3. Dependencies͸ॳճىಈʗߏ੒มߋ࣌ʹղܾ͠
    Caching͞ΕΔͷͰ଴ͨ͞Εͳ͍
    

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20. Kotlin script Cons
    1. ⾠ Experimental
    2. IDEʹΑΔsupport͕ऑ͍
    • Import
    • Suggestion
    

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21. ๻ͱKotlin͸ͣͬͱҰॹ
    

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22. LINE Fukuoka͸
    Android EngineerΛ
    ืू͍ͯ͠·͢!!!!!
    

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