Added highlighting for parameters.

idea/src/org/jetbrains/jet/plugin/highlighter/JetColorSettingsPage.java

@@ -132,6 +132,7 @@ public class JetColorSettingsPage implements ColorSettingsPage {
             new AttributesDescriptor("Mutable variable, parameter or property", JetHighlightingColors.MUTABLE_VARIABLE),
 
             new AttributesDescriptor("Local variable", JetHighlightingColors.LOCAL_VARIABLE),
+            new AttributesDescriptor("Parameter", JetHighlightingColors.PARAMETER),
             new AttributesDescriptor("Closure or anonymous object bound variable", JetHighlightingColors.WRAPPED_INTO_REF),
 
             new AttributesDescriptor("Instance property", JetHighlightingColors.INSTANCE_PROPERTY),

idea/src/org/jetbrains/jet/plugin/highlighter/JetHighlightingColors.java

@@ -161,14 +161,19 @@ public class JetHighlightingColors {
         CodeInsightColors.ANNOTATION_NAME_ATTRIBUTES.getDefaultAttributes()
     );
 
+    public static final TextAttributesKey MUTABLE_VARIABLE = TextAttributesKey.createTextAttributesKey(
+        "KOTLIN_MUTABLE_VARIABLE",
+        new TextAttributes(null, null, Color.BLACK, EffectType.LINE_UNDERSCORE, 0)
+    );
+
     public static final TextAttributesKey LOCAL_VARIABLE = TextAttributesKey.createTextAttributesKey(
         "KOTLIN_LOCAL_VARIABLE",
         CodeInsightColors.LOCAL_VARIABLE_ATTRIBUTES.getDefaultAttributes()
     );
 
-    public static final TextAttributesKey MUTABLE_VARIABLE = TextAttributesKey.createTextAttributesKey(
+    public static final TextAttributesKey PARAMETER = TextAttributesKey.createTextAttributesKey(
-        "KOTLIN_MUTABLE_VARIABLE",
+        "KOTLIN_PARAMETER",
-        new TextAttributes(null, null, Color.BLACK, EffectType.LINE_UNDERSCORE, 0)
+        CodeInsightColors.PARAMETER_ATTRIBUTES.getDefaultAttributes()
     );
 
     public static final TextAttributesKey WRAPPED_INTO_REF = TextAttributesKey.createTextAttributesKey(

idea/src/org/jetbrains/jet/plugin/highlighter/VariablesHighlightingVisitor.java

@@ -89,17 +89,23 @@ class VariablesHighlightingVisitor extends AfterAnalysisHighlightingVisitor {
 
     private void highlightVariable(@NotNull PsiElement elementToHighlight, @NotNull DeclarationDescriptor descriptor) {
         if (descriptor instanceof VariableDescriptor) {
-            if (((VariableDescriptor)descriptor).isVar()) {
+            VariableDescriptor variableDescriptor = (VariableDescriptor) descriptor;
+            if (variableDescriptor.isVar()) {
                 holder.createInfoAnnotation(elementToHighlight, null).setTextAttributes(JetHighlightingColors.MUTABLE_VARIABLE);
             }
-        }
+
-        if (descriptor instanceof LocalVariableDescriptor) {
-            LocalVariableDescriptor variableDescriptor = (LocalVariableDescriptor) descriptor;
             if (Boolean.TRUE.equals(bindingContext.get(MUST_BE_WRAPPED_IN_A_REF, variableDescriptor))) {
                 holder.createInfoAnnotation(elementToHighlight, "Wrapped into a ref-object to be modifier when captured in a closure").setTextAttributes(
                     JetHighlightingColors.WRAPPED_INTO_REF);
             }
-            holder.createInfoAnnotation(elementToHighlight, null).setTextAttributes(JetHighlightingColors.LOCAL_VARIABLE);
+
+            if (descriptor instanceof LocalVariableDescriptor) {
+                holder.createInfoAnnotation(elementToHighlight, null).setTextAttributes(JetHighlightingColors.LOCAL_VARIABLE);
+            }
+
+            if (descriptor instanceof ValueParameterDescriptor) {
+                holder.createInfoAnnotation(elementToHighlight, null).setTextAttributes(JetHighlightingColors.PARAMETER);
+            }
         }
     }
 }