Fix for KT-10885

Assignment as expression conversion: e.g int i = j = 0

j2k/src/org/jetbrains/kotlin/j2k/ast/Expressions.kt

@@ -31,10 +31,21 @@ class ArrayAccessExpression(val expression: Expression, val index: Expression, v
     }
 }
 
-class AssignmentExpression(val left: Expression, val right: Expression, val op: Operator) : Expression() {
-    override fun generateCode(builder: CodeBuilder) {
+open class AssignmentExpression(val left: Expression, val right: Expression, val op: Operator) : Expression() {
+
+    fun appendAssignment(builder: CodeBuilder, left: Expression, right: Expression) {
         builder.appendOperand(this, left).append(" ").append(op).append(" ").appendOperand(this, right)
     }
+
+    override fun generateCode(builder: CodeBuilder) {
+        if (right !is AssignmentExpression)
+            appendAssignment(builder, left, right)
+        else {
+            right.generateCode(builder)
+            builder.append("\n")
+            appendAssignment(builder, left, right.left)
+        }
+    }
 }
 
 class BangBangExpression(val expr: Expression) : Expression() {

j2k/src/org/jetbrains/kotlin/j2k/ast/LocalVariable.kt

@@ -28,12 +28,18 @@ class LocalVariable(
 ) : Element() {
 
     override fun generateCode(builder: CodeBuilder) {
+        if(initializer is AssignmentExpression)
+            builder append initializer append "\n"
         builder append annotations append (if (isVal) "val " else "var ") append identifier
         if (explicitType != null) {
             builder append ":" append explicitType
         }
         if (!initializer.isEmpty) {
-            builder append " = " append initializer
+            builder append " = "
+            if(initializer is AssignmentExpression)
+                builder append initializer.left
+            else
+                builder append initializer
         }
     }
 }

j2k/testData/fileOrElement/assignmentExpression/and.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x &= 2

j2k/testData/fileOrElement/assignmentExpression/assignment.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x = 2

j2k/testData/fileOrElement/assignmentExpression/assignmentAsExpression.java

@@ -0,0 +1,11 @@
+public class AssignmentAsExpression {
+    private int field;
+    private int field2;
+
+    public void assign(int value) {
+        int v = field = value;
+        field = field2 = value;
+        int j;
+        int i = j = 0;
+    }
+}

j2k/testData/fileOrElement/assignmentExpression/assignmentAsExpression.kt

@@ -0,0 +1,14 @@
+class AssignmentAsExpression {
+    private var field: Int = 0
+    private var field2: Int = 0
+
+    fun assign(value: Int) {
+        field = value
+        val v = field
+        field2 = value
+        field = field2
+        val j: Int
+        j = 0
+        val i = j
+    }
+}

j2k/testData/fileOrElement/assignmentExpression/divideAssign.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x /= 2

j2k/testData/fileOrElement/assignmentExpression/minusAssign.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x -= 2

j2k/testData/fileOrElement/assignmentExpression/multiplyAssign.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x *= 2

j2k/testData/fileOrElement/assignmentExpression/or.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x |= 2

j2k/testData/fileOrElement/assignmentExpression/plusAssign.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x += 2

j2k/testData/fileOrElement/assignmentExpression/reminder.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x %= 2

j2k/testData/fileOrElement/assignmentExpression/shiftLeft.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x <<= 2

j2k/testData/fileOrElement/assignmentExpression/shiftRight.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x >>= 2

j2k/testData/fileOrElement/assignmentExpression/unsignedRightShift.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x >>>= 2

j2k/testData/fileOrElement/assignmentExpression/xor.java

@@ -1,2 +1,2 @@
-//expression
+//statement
 x ^= 2

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterForWebDemoTestGenerated.java

@@ -412,6 +412,12 @@ public class JavaToKotlinConverterForWebDemoTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("assignmentAsExpression.java")
+        public void testAssignmentAsExpression() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assignmentExpression/assignmentAsExpression.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("divideAssign.java")
         public void testDivideAssign() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assignmentExpression/divideAssign.java");
@@ -1743,8 +1749,7 @@ public class JavaToKotlinConverterForWebDemoTestGenerated extends AbstractJavaTo
 
         @TestMetadata("escapedCharactersInCodeQuote.java")
         public void testEscapedCharactersInCodeQuote() throws Exception {
-            String fileName =
-                    KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/docComments/escapedCharactersInCodeQuote.java");
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/docComments/escapedCharactersInCodeQuote.java");
             doTest(fileName);
         }
 

j2k/tests/org/jetbrains/kotlin/j2k/JavaToKotlinConverterSingleFileTestGenerated.java

@@ -412,6 +412,12 @@ public class JavaToKotlinConverterSingleFileTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("assignmentAsExpression.java")
+        public void testAssignmentAsExpression() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assignmentExpression/assignmentAsExpression.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("divideAssign.java")
         public void testDivideAssign() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/assignmentExpression/divideAssign.java");
@@ -1743,8 +1749,7 @@ public class JavaToKotlinConverterSingleFileTestGenerated extends AbstractJavaTo
 
         @TestMetadata("escapedCharactersInCodeQuote.java")
         public void testEscapedCharactersInCodeQuote() throws Exception {
-            String fileName =
-                    KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/docComments/escapedCharactersInCodeQuote.java");
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/docComments/escapedCharactersInCodeQuote.java");
             doTest(fileName);
         }