KT-11612 Highlight named arguments in the editor somehow

#KT-11612 Fixed

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

@@ -87,6 +87,7 @@ public class KotlinHighlightingColors {
     public static final TextAttributesKey LABEL = createTextAttributesKey("KOTLIN_LABEL");
     public static final TextAttributesKey DEBUG_INFO = createTextAttributesKey("KOTLIN_DEBUG_INFO");
     public static final TextAttributesKey RESOLVED_TO_ERROR = createTextAttributesKey("KOTLIN_RESOLVED_TO_ERROR");
+    public static final TextAttributesKey NAMED_ARGUMENT = createTextAttributesKey("KOTLIN_NAMED_ARGUMENT");
 
     private KotlinHighlightingColors() {
     }

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

@@ -18,10 +18,14 @@ package org.jetbrains.kotlin.idea.highlighter
 
 import com.intellij.lang.annotation.AnnotationHolder
 import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.psi.KtLambdaExpression
+import org.jetbrains.kotlin.psi.KtValueArgument
 import org.jetbrains.kotlin.psi.KtVisitorVoid
+import org.jetbrains.kotlin.psi.psiUtil.endOffset
+import org.jetbrains.kotlin.psi.psiUtil.startOffset
 
 internal class SoftKeywordsHighlightingVisitor(private val holder: AnnotationHolder) : KtVisitorVoid() {
 
@@ -59,4 +63,12 @@ internal class SoftKeywordsHighlightingVisitor(private val holder: AnnotationHol
             holder.createInfoAnnotation(arrow, null).textAttributes = KotlinHighlightingColors.FUNCTION_LITERAL_BRACES_AND_ARROW
         }
     }
+
+    override fun visitArgument(argument: KtValueArgument) {
+        super.visitArgument(argument)
+
+        val argumentName = argument.getArgumentName() ?: return
+        val eq = argument.equalsToken ?: return
+        holder.createInfoAnnotation(TextRange(argumentName.startOffset, eq.endOffset), null).textAttributes = KotlinHighlightingColors.NAMED_ARGUMENT
+    }
 }

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

@@ -51,7 +51,10 @@ class VariablesHighlightingVisitor extends AfterAnalysisHighlightingVisitor {
             }
         }
 
-        highlightVariable(expression, target);
+        if (!(expression.getParent() instanceof KtValueArgumentName)) { // highlighted separately
+            highlightVariable(expression, target);
+        }
+
         super.visitSimpleNameExpression(expression);
     }
 

idea/resources/colorScheme/Darcula_Kotlin.xml

@@ -45,6 +45,11 @@
       <option name="FOREGROUND" value="467cda" />
     </value>
   </option>
+  <option name="KOTLIN_NAMED_ARGUMENT">
+    <value>
+      <option name="FOREGROUND" value="467cda" />
+    </value>
+  </option>
   <option name="KOTLIN_DYNAMIC_FUNCTION_CALL">
     <value>
       <option name="FONT_TYPE" value="3" />

idea/resources/colorScheme/Default_Kotlin.xml

@@ -45,6 +45,11 @@
       <option name="FOREGROUND" value="4a86e8" />
     </value>
   </option>
+  <option name="KOTLIN_NAMED_ARGUMENT">
+    <value>
+      <option name="FOREGROUND" value="4a86e8" />
+    </value>
+  </option>
   <option name="KOTLIN_DYNAMIC_FUNCTION_CALL">
     <value>
       <option name="FONT_TYPE" value="3" />

idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinColorSettingsPage.kt

@@ -65,7 +65,7 @@ class KotlinColorSettingsPage : ColorSettingsPage {
 
 fun Int?.bar() {
     if (this != null) {
-        println(<SMART_CAST_RECEIVER>toString</SMART_CAST_RECEIVER>())
+        println(<NAMED_ARGUMENT>message =</NAMED_ARGUMENT> <SMART_CAST_RECEIVER>toString</SMART_CAST_RECEIVER>())
     }
     else {
         println(<SMART_CONSTANT>this</SMART_CONSTANT>.toString())
@@ -157,7 +157,8 @@ var <PACKAGE_PROPERTY><MUTABLE_VARIABLE><PROPERTY_WITH_BACKING_FIELD>globalCount
                        KotlinBundle.message("options.kotlin.attribute.descriptor.smart.cast") to KotlinHighlightingColors.SMART_CAST_VALUE,
                        KotlinBundle.message("options.kotlin.attribute.descriptor.smart.constant") to KotlinHighlightingColors.SMART_CONSTANT,
                        KotlinBundle.message("options.kotlin.attribute.descriptor.smart.cast.receiver") to KotlinHighlightingColors.SMART_CAST_RECEIVER,
-                       KotlinBundle.message("options.kotlin.attribute.descriptor.label") to KotlinHighlightingColors.LABEL)
+                       KotlinBundle.message("options.kotlin.attribute.descriptor.label") to KotlinHighlightingColors.LABEL,
+                       "Named argument" to KotlinHighlightingColors.NAMED_ARGUMENT)
     }
 
     override fun getColorDescriptors(): Array<ColorDescriptor> = ColorDescriptor.EMPTY_ARRAY

idea/testData/checker/infos/CapturedInInlinedClosure.kt

@@ -9,7 +9,7 @@ fun inline() {
     run ({ x1 })
 
     val x2 = 1
-    run (f = { x2 })
+    run (<info descr="null">f =</info> { x2 })
 
     val x3 = 1
     run {

idea/testData/highlighter/NamedArguments.kt

@@ -0,0 +1,7 @@
+fun <info textAttributesKey="KOTLIN_FUNCTION_DECLARATION">foo</info>(<info textAttributesKey="KOTLIN_PARAMETER">p1</info>: <info textAttributesKey="KOTLIN_CLASS">Int</info>, <info textAttributesKey="KOTLIN_PARAMETER">p2</info>: <info textAttributesKey="KOTLIN_CLASS">String</info>): <info textAttributesKey="KOTLIN_CLASS">String</info> {
+    return <info textAttributesKey="KOTLIN_PARAMETER">p2</info> + <info textAttributesKey="KOTLIN_PARAMETER">p1</info>
+}
+
+fun <info textAttributesKey="KOTLIN_FUNCTION_DECLARATION">bar</info>() {
+    <info textAttributesKey="KOTLIN_PACKAGE_FUNCTION_CALL"><info textAttributesKey="KOTLIN_FUNCTION_CALL">foo</info></info>(1, <info textAttributesKey="KOTLIN_NAMED_ARGUMENT">p2 =</info> "")
+}

idea/tests/org/jetbrains/kotlin/idea/highlighter/HighlightingTestGenerated.java

@@ -83,6 +83,12 @@ public class HighlightingTestGenerated extends AbstractHighlightingTest {
         doTest(fileName);
     }
 
+    @TestMetadata("NamedArguments.kt")
+    public void testNamedArguments() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/highlighter/NamedArguments.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("Object.kt")
     public void testObject() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/highlighter/Object.kt");