keyword argument can be renamed

python/psi-api/src/com/jetbrains/python/psi/PyElementGenerator.java

@@ -77,6 +77,8 @@ public abstract class PyElementGenerator {
 
   public abstract PyNamedParameter createParameter(@NotNull String name);
 
+  public abstract PyKeywordArgument createKeywordArgument(LanguageLevel languageLevel, String keyword, String value);
+
   public abstract PsiFile createDummyFile(LanguageLevel langLevel, String contents);
 
   public abstract PyExpressionStatement createDocstring(String content);

python/psi-api/src/com/jetbrains/python/psi/PyKeywordArgument.java

@@ -1,12 +1,13 @@
 package com.jetbrains.python.psi;
 
+import com.intellij.psi.PsiNamedElement;
 import org.jetbrains.annotations.Nullable;
 import com.intellij.lang.ASTNode;
 
 /**
  * @author yole
  */
-public interface PyKeywordArgument extends PyExpression {
+public interface PyKeywordArgument extends PyExpression, PsiNamedElement {
   @Nullable
   String getKeyword();
 

python/src/com/jetbrains/python/codeInsight/controlflow/PyControlFlowBuilder.java

@@ -96,7 +96,7 @@ public class PyControlFlowBuilder extends PyRecursiveElementVisitor {
 
   @Override
   public void visitPyElement(PyElement node) {
-    if (node instanceof PsiNamedElement) {
+    if (node instanceof PsiNamedElement && !(node instanceof PyKeywordArgument)) {
       myBuilder.startNode(node);
       myBuilder.addNode(ReadWriteInstruction.newInstruction(myBuilder, node, node.getName(), ReadWriteInstruction.ACCESS.WRITE));
     }

python/src/com/jetbrains/python/findUsages/PythonFindUsagesProvider.java

@@ -47,6 +47,9 @@ public class PythonFindUsagesProvider implements FindUsagesProvider {
       }
       return "variable";
     }
+    if (element instanceof PyKeywordArgument) {
+      return "keyword argument";
+    }
     return "";
   }
 

python/src/com/jetbrains/python/psi/impl/PyElementGeneratorImpl.java

@@ -239,6 +239,12 @@ public class PyElementGeneratorImpl extends PyElementGenerator {
     return createFromText(LanguageLevel.getDefault(), PyNamedParameter.class, "def f(" + name + "): pass", PATH_PARAMETER);
   }
 
+  @Override
+  public PyKeywordArgument createKeywordArgument(LanguageLevel languageLevel, String keyword, String value) {
+    PyCallExpression callExpression = (PyCallExpression) createExpressionFromText(languageLevel, "foo(" + keyword + "=" + value + ")");
+    return (PyKeywordArgument) callExpression.getArguments()[0];
+  }
+
   @NotNull
   public <T> T createFromText(LanguageLevel langLevel, Class<T> aClass, final String text, final int[] path) {
     PsiElement ret = createDummyFile(langLevel, text);

python/src/com/jetbrains/python/psi/impl/PyKeywordArgumentImpl.java

@@ -1,13 +1,18 @@
 package com.jetbrains.python.psi.impl;
 
 import com.intellij.lang.ASTNode;
+import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiReference;
 import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.util.IncorrectOperationException;
 import com.jetbrains.python.PyTokenTypes;
+import com.jetbrains.python.psi.LanguageLevel;
+import com.jetbrains.python.psi.PyElementGenerator;
 import com.jetbrains.python.psi.PyExpression;
 import com.jetbrains.python.psi.PyKeywordArgument;
 import com.jetbrains.python.psi.types.PyType;
 import com.jetbrains.python.psi.types.TypeEvalContext;
+import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -53,4 +58,19 @@ public class PyKeywordArgumentImpl extends PyElementImpl implements PyKeywordArg
     }
     return null;
   }
+
+  @Override
+  public String getName() {
+    return getKeyword();
+  }
+
+  @Override
+  public PsiElement setName(@NonNls @NotNull String name) throws IncorrectOperationException {
+    PyElementGenerator generator = PyElementGenerator.getInstance(getProject());
+    PyExpression expression = getValueExpression();
+    PyKeywordArgument keywordArgument = generator.createKeywordArgument(LanguageLevel.forElement(this), name,
+                                                                        expression != null ? expression.getText() : name);
+    getNode().replaceChild(getKeywordNode(), keywordArgument.getKeywordNode());
+    return this;
+  }
 }