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Custom Language Support Tutorial | IntelliJ Platform Plugin SDK

In this tutorial, we will add support for a .properties language and its usages within Java code.

IntelliJ Platform support for custom languages is discussed in more depth in the Custom Language Support section. Corresponding parts are linked under Reference on top of each page in this tutorial.

All relevant code added or changed on a page is linked in Code.

The accompanying Testing a Custom Language Plugin tutorial covers testing the functionality; corresponding parts are linked under Testing.

The complete and fully working example plugin used in this tutorial is the simple_language_plugin code sample.

See Code Samples on how to build and run it.

This is a step-by-step tutorial, and it requires completing each step, in order:

• 1. Prerequisites

• 12. Folding Builder

• 2. Language and File Type

• 13. Go To Symbol Contributor

• 3. Grammar and Parser

• 14. Structure View Factory

• 4. Lexer and Parser Definition

• 15. Structure Aware Navigation Bar

• 5. Syntax Highlighter and Color Settings Page

• 16. Formatter

• 6. PSI Helpers and Utilities

• 17. Code Style Settings

• 7. Annotator

• 18. Commenter

• 8. Line Marker Provider

• 19. Quick Fix

• 9. Completion Contributor

• 20. Documentation

• 10. Reference Contributor

• 21. Spell Checking

• 11. Find Usages Provider

If a topic is not covered in the above sections, let us know via the Was this page helpful? feedback form below or other channels.

Be specific about the topics and reasons for adding them and leave your email in case we need more details. Thanks for your feedback!

19 March 2025

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