intellij-sdk-code-samples/topics/tutorials/custom_language_support/prerequisites.md

1. Prerequisites

Steps required before starting implementation of a sample custom language support.

Download and Install IntelliJ IDEA

Download and install either IntelliJ IDEA Ultimate or IntelliJ IDEA Community Edition from here.

Check out Community Edition Source Files

While not required, having the full sources of the platform and all bundled plugins available for browsing allows finding related implementations.

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Download the IntelliJ IDEA Community Edition source files as described in the IntelliJ IDEA Community Edition README file.

Install Required Plugins

Make sure that the Plugin DevKit and Gradle plugins are enabled.

Install and enable Grammar-Kit and PsiViewer (optionally) plugins.

Create a Project

Create an empty IntelliJ Platform Plugin project or start using when creating a plugin hosted on GitHub.