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15. Formatter

The IntelliJ Platform includes a powerful framework for implementing formatting for custom languages. A formatter enables reformatting code automatically based on code style settings. The formatter controls spaces, indents, wrap, and alignment.

Reference: Code Formatter

  • bullet list {:toc}

15.1. Define a Block

The formatting model represents the formatting structure of a file as a tree of Block objects, with associated indent, wrap, alignment and spacing settings. The goal is to cover each PSI element with such a block. Since each block builds its children's blocks, it can generate extra blocks or skip any PSI elements. Define SimpleBlock based on AbstractBlock.

{% include /code_samples/simple_language_plugin/src/main/java/org/intellij/sdk/language/SimpleBlock.java %}

15.2. Define a Formatting Model Builder

Define a formatter that removes extra spaces except for the single spaces around the property separator. For example, reformat "foo =     bar" to "foo = bar".

Create SimpleFormattingModelBuilder by subclassing FormattingModelBuilder.

{% include /code_samples/simple_language_plugin/src/main/java/org/intellij/sdk/language/SimpleFormattingModelBuilder.java %}

15.3. Register the Formatter

The SimpleFormattingModelBuilder implementation is registered with the IntelliJ Platform in the plugin configuration file using the com.intellij.lang.formatter extension point.

 <extensions defaultExtensionNs="com.intellij">
    <lang.formatter language="Simple"  
            implementationClass="org.intellij.sdk.language.SimpleFormattingModelBuilder"/>
  </extensions>

15.4. Run the Project

Add some extra spaces around the = separator between language and English. Reformat the code by selecting Code | Show Reformat File Dialog and choose Run.

Formatter