KT-21974 Editor color scheme option for Kotlin typealias names (#1457)

idea/idea-analysis/src/org/jetbrains/kotlin/idea/KotlinBundle.properties

@@ -74,6 +74,7 @@ options.kotlin.attribute.descriptor.kdoc.tag=Comments//KDoc//KDoc tag
 options.kotlin.attribute.descriptor.kdoc.value=Comments//KDoc//Link in KDoc tag
 options.kotlin.attribute.descriptor.object=Classes and Interfaces//Object
 options.kotlin.attribute.descriptor.enumEntry=Classes and Interfaces//Enum entry
+options.kotlin.attribute.descriptor.typeAlias=Classes and Interfaces//Type alias
 options.kotlin.attribute.descriptor.var=Properties and Variables//Var (mutable variable, parameter or property)
 options.kotlin.attribute.descriptor.local.variable=Properties and Variables//Local variable or value
 options.kotlin.attribute.descriptor.captured.variable=Properties and Variables//Variables and values captured in a closure

idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/KotlinHighlightingColors.java

@@ -59,6 +59,7 @@ public class KotlinHighlightingColors {
     public static final TextAttributesKey ANNOTATION = createTextAttributesKey("KOTLIN_ANNOTATION", JavaHighlightingColors.ANNOTATION_NAME_ATTRIBUTES);
     public static final TextAttributesKey OBJECT = createTextAttributesKey("KOTLIN_OBJECT", CLASS);
     public static final TextAttributesKey ENUM_ENTRY = createTextAttributesKey("KOTLIN_ENUM_ENTRY", DefaultLanguageHighlighterColors.INSTANCE_FIELD);
+    public static final TextAttributesKey TYPE_ALIAS = createTextAttributesKey("KOTLIN_TYPE_ALIAS", CLASS);
 
     // variable kinds
     public static final TextAttributesKey MUTABLE_VARIABLE = createTextAttributesKey("KOTLIN_MUTABLE_VARIABLE");

idea/idea-analysis/src/org/jetbrains/kotlin/idea/highlighter/TypeKindHighlightingVisitor.kt

@@ -57,6 +57,9 @@ internal class TypeKindHighlightingVisitor(holder: AnnotationHolder, bindingCont
             else if (referenceTarget is TypeParameterDescriptor) {
                 highlightName(expression, TYPE_PARAMETER)
             }
+            else if (referenceTarget is TypeAliasDescriptor) {
+                highlightName(expression, TYPE_ALIAS)
+            }
         }
     }
 
@@ -92,6 +95,16 @@ internal class TypeKindHighlightingVisitor(holder: AnnotationHolder, bindingCont
         super.visitClassOrObject(classOrObject)
     }
 
+    override fun visitTypeAlias(typeAlias: KtTypeAlias) {
+        val identifier = typeAlias.nameIdentifier
+        val descriptor = bindingContext.get(BindingContext.TYPE_ALIAS, typeAlias)
+        if (identifier != null && descriptor != null) {
+            if (applyHighlighterExtensions(identifier, descriptor)) return
+            highlightName(identifier, TYPE_ALIAS)
+        }
+        super.visitTypeAlias(typeAlias)
+    }
+
     override fun visitDynamicType(type: KtDynamicType) {
         // Do nothing: 'dynamic' is highlighted as a keyword
     }