Fix inAnnotation test in 173 branch
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  1. .idea/
  2. android-studio/
  3. annotations/
  4. ant/
  5. build-common/
  6. buildSrc/
  7. compiler/
  8. compiler.tests-common/
  9. core/
  10. custom-dependencies/
  11. eval4j/
  12. generators/
  13. gradle/
  14. grammar/
  15. idea/
  16. idea-runner/
  17. j2k/
  18. jps-plugin/
  19. js/
  20. lib/
  21. libraries/
  22. license/
  23. non-compiler-tests/
  24. plugins/
  25. prepare/
  26. resources/
  27. spec-docs/
  28. third-party/
  29. ultimate/
  30. .gitattributes
  31. .gitignore
  32. build.gradle.kts
  33. build.xml
  34. ChangeLog.md
  35. common.xml
  36. description
  37. download_android_sdk.xml
  38. gradle.properties
  39. gradlew
  40. gradlew.bat
  41. node_utils.xml
  42. ReadMe.md
  43. settings.gradle
  44. TeamCityBuild.xml
  45. TeamCityRelay.xml
  46. update_dependencies.xml
  47. upload_plugins.gradle
ReadMe.md

official project TeamCity (simple build status) Maven Central GitHub license

Kotlin Programming Language

Welcome to Kotlin! Some handy links:

Editing Kotlin

Build environment requirements

In order to build Kotlin distribution you need to have:

  • Apache Ant 1.9.4 and higher

  • JDK 1.6, 1.7 and 1.8

  • Setup environment variables as following:

      JAVA_HOME="path to JDK 1.8"
      JDK_16="path to JDK 1.6"
      JDK_17="path to JDK 1.7"
      JDK_18="path to JDK 1.8"
    

For local development, if you‘re not working on bytecode generation or the standard library, it’s OK to have only JDK 8 installed, and to point all of the environment variables mentioned above to your JDK 8 installation.

You also can use Gradle properties to setup JDK_* variables.

Note: The JDK 6 for MacOS is not available on Oracle's site. You can download it here.

Building

To build this project, first time you try to build you need to run this:

ant -f update_dependencies.xml

which will setup the dependencies on

  • intellij-core is a part of command line compiler and contains only necessary APIs.
  • idea-full is a full blown IntelliJ IDEA Community Edition to be used in the plugin module.

Then, you may run Gradle to build the project and run tests, using:

./gradlew <tasks-and-options>

command on Unix/macOS, or

gradlew <tasks-and-options>

on Windows.

Important gradle tasks

  • clean - clean build results
  • dist - assembles the compiler distribution into dist/kotlinc/ folder
  • ideaPlugin - assembles the Kotlin IDEA plugin distribution into dist/artifacts/Kotlin folder
  • install - build and install all public artifacts into local maven repository
  • runIde - build IDEA plugin and run IDEA with it
  • coreLibsTest - build and run stdlib, reflect and kotlin-test tests
  • gradlePluginsTest - build and run gradle plugin tests
  • compilerTest - build and run all compiler tests
  • ideaPluginTest - build and run all IDEA plugin tests

OPTIONAL: Some artifacts, mainly Maven plugin ones, are built separately by Maven: go into libraries directory after building the compiler and run:

mvn install

Refer to libraries/ReadMe.md for details.

Working with the project in IntelliJ IDEA

Working with the Kotlin project requires IntelliJ IDEA 2017.3. You can download an Early Access Preview version of IntelliJ IDEA 2017.3 here.

To import the project in Intellij choose project directory in Open project dialog. Then, after project opened, Select File -> New... -> Module from Existing Sources in the menu, and select build.gradle.kts file in the project's root folder.

In the import dialog, select use default gradle wrapper.

To be able to run tests from IntelliJ easily, check Delegate IDE build/run actions to Gradle in the Gradle runner settings.

At this time, you can use the latest released 1.1.x version of the Kotlin plugin for working with the code. To make sure you have the latest version installed, use Tools | Kotlin | Configure Kotlin Plugin Updates and press “Check for updates now”.

Compiling and running

From this root project there are Run/Debug Configurations for running IDEA or the Compiler Tests for example; so if you want to try out the latest and greatest IDEA plugin

  • VCS -> Git -> Pull
  • Run the “IDEA” run configuration in the project
  • a child IntelliJ IDEA with the Kotlin plugin will then startup

Contributing

We love contributions! There‘s lots to do on Kotlin and on the standard library so why not chat with us about what you’re interested in doing? Please join the #kontributors channel in our Slack chat and let us know about your plans.

If you want to find some issues to start off with, try this query which should find all Kotlin issues that marked as “up-for-grabs”.

Currently only committers can assign issues to themselves so just add a comment if you're starting work on it.

A nice gentle way to contribute would be to review the standard library docs and find classes or functions which are not documented very well and submit a patch.

In particular it‘d be great if all functions included a nice example of how to use it such as for the hashMapOf() function. This is implemented using the @sample macro to include code from a test function. The benefits of this approach are twofold; First, the API’s documentation is improved via beneficial examples that help new users and second, the code coverage is increased.

Also the JavaScript translation could really use your help. See the JavaScript contribution section for more details.

Some of the code in the standard library is created by generating code from templates. See the README in the stdlib section for how run the code generator. The existing templates can be used as examples for creating new ones.

Submitting patches

The best way to submit a patch is to fork the project on github then send us a pull request via github.

If you create your own fork, it might help to enable rebase by default when you pull by executing

git config --global pull.rebase true

This will avoid your local repo having too many merge commits which will help keep your pull request simple and easy to apply.