Next Level DSLs Configure your app the Kotlin way! Aaron Sarazan - - PowerPoint PPT Presentation

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Next Level DSLs Configure your app the Kotlin way! Aaron Sarazan - - PowerPoint PPT Presentation

Mar 27, 2023 221 likes •859 views

Next Level DSLs Configure your app the Kotlin way! Aaron Sarazan CTO - Stencil Ltd. https://gitlab.com/asarazan/kotlinconf18 aaron@stencil.ltd Isolated Feature Development A Plugin Its like an app, just smaller Android Manifest Plugin

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https://gitlab.com/asarazan/kotlinconf18

Next Level DSLs

Configure your app the Kotlin way!

Aaron Sarazan CTO - Stencil Ltd. aaron@stencil.ltd

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Isolated Feature Development

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A Plugin

It’s like an app, just smaller

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Android Manifest

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Plugin DSL

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Plugin DSL

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Plugin DSL

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Plugin DSL

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Plugin DSL

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Back to Basics

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Help! What’s a DSL?

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When you really wish your language could do the thing.

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Help! What’s a DSL?

Java

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Help! What’s a DSL?

LISP

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Help! What’s a DSL?

Ruby

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Podfiles

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Help! What’s a DSL?

Domain Specific Language

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white space

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Remove Boilerplate

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Help! What’s a DSL?

Domain Specific Language

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Help! What’s a DSL?

Domain Specific Language

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Help! What’s a DSL?

Domain Specific Language

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Help! What’s a DSL?

Domain Specific Language

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You don’t DO the thing. You STATE the thing.

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GRADLE!

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Here’s How It Works

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Here’s How It Works

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Here’s How It Works

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Experience Get!

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Why Kotlin?

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Groovy-Style

Type-Safe Builders

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It was literally built for it.

Kotlin is made for DSLs

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When Should I Make a DSL?

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Anko

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Anko

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Anko

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This is Really Unpleasant

...and there has to be a better way.

  • XML
  • Configuration
  • Declaration
  • Boilerplate
  • Builders
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Builders

ALWAYS a candidate for DSLs

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Readability

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Work Backwards

Start from the result that you want to enable ...then write the code that enables it!

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Start With Builders

Immutability with a side of Java-friendliness!

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@DslMarker

Prevent Scoping Mishaps!

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Good Hygiene

  • Don’t pollute the global namespace
  • Unary “+” only if well-scoped
  • Keep Lambda files next to your builder classes

○ Plugin.kt ○ PluginLambdas.kt

  • Don’t extend system types

○ String, Int, etc.

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Good Hygiene

  • Don’t pollute the global namespace
  • Unary “+” only if well-scoped
  • Keep Lambda files next to your builder classes

○ Plugin.kt ○ PluginLambdas.kt

  • Don’t extend system types

○ String, Int, etc.

  • Have fun!
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So Who’s Ready?

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Follow Along At Home

  • https://gitlab.com/asarazan/kotlinconf18
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Thank You

aaron@stencil.ltd https://gitlab.com/asarazan/kotlinconf18

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DSLs EVERYWHERE

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Kotlin’s Strongest Metaphors

Applied to Java’s biggest bummers

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How Did We Get Here?

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Value Types & Structs!!!

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Next Level DSLs

Configure your app the Kotlin way!

Aaron Sarazan CTO - Stencil Ltd. aaron@stencil.ltd

https://gitlab.com/asarazan/kotlinconf18

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How About That Keynote?

I can’t wait to get home and try out {AWESOME NEW FEATURE}

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Next Level DSLs

Configure your app the Kotlin way!

Aaron Sarazan CTO - Stencil Ltd. aaron@stencil.ltd

https://gitlab.com/asarazan/kotlinconf18

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Follow Along At Home

  • https://gitlab.com/asarazan/kotlinconf18
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Why Kotlin?