Conversion on copy paste:

Copy element as text in case it can't be converted

idea/src/org/jetbrains/jet/plugin/conversion/copy/JavaCopyPastePostProcessor.kt

@@ -107,7 +107,13 @@ public class JavaCopyPastePostProcessor() : CopyPastePostProcessor<TextBlockTran
                 break;
             }
             val elementToConvert = findTopMostParentWhollyInRange(currentRange, leafElement)
-            result.append(converter.elementToKotlin(elementToConvert))
+            val converted = converter.elementToKotlin(elementToConvert)
+            if (converted.isNotEmpty()) {
+                result.append(converted)
+            }
+            else {
+                result.append(elementToConvert.getText())
+            }
             val endOfConverted = elementToConvert.getTextRange()!!.getEndOffset()
             currentRange = TextRange(endOfConverted, currentRange.getEndOffset())
         }

idea/testData/copyPaste/conversion/Arithmetic.expected.kt

@@ -0,0 +1 @@
+b - c + d

idea/testData/copyPaste/conversion/Arithmetic.java

@@ -0,0 +1,3 @@
+public static void main(String[]args){
+    a + <selection>b - c + d</selection> - e
+}

idea/testData/copyPaste/conversion/Arithmetic.to.kt

@@ -0,0 +1 @@
+<caret>

idea/testData/copyPaste/conversion/OnlyOneBraceFromBlock.expected.kt

@@ -0,0 +1,4 @@
+fun main(args: Array<String>) {
+    {
+        val a = Object()
+}

idea/testData/copyPaste/conversion/OnlyOneBraceFromBlock.java

@@ -0,0 +1,5 @@
+class A {
+    public static void main(String[] args) <selection>{
+        Object a = new Object();</selection>
+    }
+}

idea/testData/copyPaste/conversion/OnlyOneBraceFromBlock.to.kt

@@ -0,0 +1,3 @@
+fun main(args: Array<String>) {
+    <caret>
+}

idea/testData/copyPaste/conversion/SingleWordFromIdentifier.expected.kt

@@ -0,0 +1 @@
+class 

idea/testData/copyPaste/conversion/SingleWordFromIdentifier.java

@@ -0,0 +1,3 @@
+<selection>class Some</selection>InterestingClass {
+
+}

idea/testData/copyPaste/conversion/SingleWordFromIdentifier.to.kt

@@ -0,0 +1 @@
+<caret>

idea/tests/org/jetbrains/jet/plugin/conversion/copy/JavaToKotlinCopyPasteConversionTestGenerated.java

@@ -36,6 +36,11 @@ public class JavaToKotlinCopyPasteConversionTestGenerated extends AbstractJavaTo
         JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("idea/testData/copyPaste/conversion"), Pattern.compile("^(.+)\\.java$"), true);
     }
     
+    @TestMetadata("Arithmetic.java")
+    public void testArithmetic() throws Exception {
+        doTest("idea/testData/copyPaste/conversion/Arithmetic.java");
+    }
+    
     @TestMetadata("Constructor.java")
     public void testConstructor() throws Exception {
         doTest("idea/testData/copyPaste/conversion/Constructor.java");
@@ -66,6 +71,11 @@ public class JavaToKotlinCopyPasteConversionTestGenerated extends AbstractJavaTo
         doTest("idea/testData/copyPaste/conversion/OnlyClosingBrace.java");
     }
     
+    @TestMetadata("OnlyOneBraceFromBlock.java")
+    public void testOnlyOneBraceFromBlock() throws Exception {
+        doTest("idea/testData/copyPaste/conversion/OnlyOneBraceFromBlock.java");
+    }
+    
     @TestMetadata("OnlyQualifier.java")
     public void testOnlyQualifier() throws Exception {
         doTest("idea/testData/copyPaste/conversion/OnlyQualifier.java");
@@ -81,4 +91,9 @@ public class JavaToKotlinCopyPasteConversionTestGenerated extends AbstractJavaTo
         doTest("idea/testData/copyPaste/conversion/SeveralMethodsSample.java");
     }
     
+    @TestMetadata("SingleWordFromIdentifier.java")
+    public void testSingleWordFromIdentifier() throws Exception {
+        doTest("idea/testData/copyPaste/conversion/SingleWordFromIdentifier.java");
+    }
+    
 }