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Showing content from https://plugins.jetbrains.com/docs/intellij/custom-language-support.html below:

Custom Language Support | IntelliJ Platform Plugin SDK

IntelliJ Platform is a powerful platform for building development tools targeting any language. Most of the IDE features consist of language-independent (provided by the platform) and language-specific parts. Supporting a particular feature for a new language can be achieved with a small amount of effort: a plugin must implement only the language-specific part.

This part of the documentation explains the main concepts of the Language API and guides you through the sequence of steps that are usually required to develop a custom language plugin. You can obtain additional information about the Language API from the Javadoc comments for the Language API classes and from the Properties language support source code, which is part of the IntelliJ IDEA Community Edition source code.

If you prefer a full example to the detailed descriptions offered in this section, please check out a step-by-step tutorial on how to create custom language support for Simple Language: Custom Language Support Tutorial. Corresponding steps from the tutorial are linked under the " Example " section on each page of this reference.

The webinar How We Built Comma, the Raku IDE, on the IntelliJ Platform offers an excellent introduction as well.

• Registering a File Type

• Implementing Parser and PSI

• Implementing Lexer

• Syntax and Error Highlighting

• References and Resolve

  • Symbols

  • Declarations and References

  • Web Symbols

• Navigation

• Code Completion

• Find Usages

• Safe Delete Refactoring

• Rename Refactoring

• Code Formatter

• Go to Class and Go to Symbol

• Code Inspections and Intentions

• Documentation

• Structure View

• Parameter Info

• Navigation Bar

• Inlay Hints

• Code Hierarchy

• Spell Checking

• Surround With

• Additional Minor Features

See Language Server Protocol (LSP) for supporting language servers.

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22 May 2025

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