quick_fix.md

title
18. Quick Fix

A quick fix for a custom language supports the IntelliJ Platform-based IDE feature Intention Actions. For the Simple Language, this tutorial adds a quick fix that helps to define an unresolved property from its usage.

Reference: Code Inspections and Intentions

• bullet list {:toc}

18.1. Update the Element Factory

The SimpleElementFactory is updated to include two new methods to support the user choice of creating a new property for the Simple Language quick fix. The new createCRLF() method supports adding a newline to the end of the test.simple file before adding a new property. A new overload of createProperty() creates a new key-value pair for Simple Language.

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

18.2. Define an Intention Action

The SimpleCreatePropertyQuickFix creates a property in the file chosen by the user - in this case, a Java file containing a prefix:key - and navigate to this property after creation. Under the hood, SimpleCreatePropertyQuickFix is an Intention Action. For a more in-depth example of an Intention Action, see conditional_operator_intention.

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

18.3. Update the Annotator

When a badProperty annotation is created, the badProperty.registerFix() method is called. This method call registers the SimpleCreatePropertyQuickFix as the Intention Action for the Intellij Platform to use to correct the problem.

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

18.4. Run the Project

Open the test Java file in an IDE Development Instance running the simple_language_plugin.

To test SimpleCreatePropertyQuickFix, change simple:website to simple:website.url. The key website.url is highlighted by SimpleAnnotator as an invalid key, as shown below. Choose "Create Property".

{:width="800px"}

The IDE opens the test.simple file and adds website.url as a new key. Add the new value jetbrains.com for the new website.url key.

Now switch back to the Java file; the new key is highlighted as valid.