J2K: parenthesize receiver if needed

#KT-10121 Fixed

idea/src/org/jetbrains/kotlin/idea/intentions/RemoveUnnecessaryParenthesesIntention.kt

@@ -17,18 +17,23 @@
 package org.jetbrains.kotlin.idea.intentions
 
 import com.intellij.openapi.editor.Editor
+import com.intellij.openapi.util.TextRange
 import org.jetbrains.kotlin.psi.KtParenthesizedExpression
 import org.jetbrains.kotlin.psi.KtPsiUtil
 import org.jetbrains.kotlin.psi.psiUtil.containsInside
 
-public class RemoveUnnecessaryParenthesesIntention : SelfTargetingIntention<KtParenthesizedExpression>(javaClass(), "Remove unnecessary parentheses") {
-    override fun isApplicableTo(element: KtParenthesizedExpression, caretOffset: Int): Boolean {
-        val expression = element.getExpression() ?: return false
-        if (!KtPsiUtil.areParenthesesUseless(element)) return false
-        return !expression.getTextRange().containsInside(caretOffset)
+public class RemoveUnnecessaryParenthesesIntention : SelfTargetingRangeIntention<KtParenthesizedExpression>(KtParenthesizedExpression::class.java, "Remove unnecessary parentheses") {
+    override fun applicabilityRange(element: KtParenthesizedExpression): TextRange? {
+        element.getExpression() ?: return null
+        if (!KtPsiUtil.areParenthesesUseless(element)) return null
+        return element.getTextRange()
     }
 
     override fun applyTo(element: KtParenthesizedExpression, editor: Editor) {
+        applyTo(element)
+    }
+
+    fun applyTo(element: KtParenthesizedExpression) {
         element.replace(element.getExpression()!!)
     }
 }

idea/src/org/jetbrains/kotlin/idea/j2k/J2kPostProcessings.kt

@@ -64,6 +64,7 @@ object J2KPostProcessingRegistrar {
         registerIntentionBasedProcessing(AddOperatorModifierIntention()) { applyTo(it) }
         registerIntentionBasedProcessing(ObjectLiteralToLambdaIntention()) { applyTo(it) }
         registerIntentionBasedProcessing(AnonymousFunctionToLambdaIntention()) { applyTo(it) }
+        registerIntentionBasedProcessing(RemoveUnnecessaryParenthesesIntention()) { applyTo(it) }
 
         registerDiagnosticBasedProcessing<KtBinaryExpressionWithTypeRHS>(Errors.USELESS_CAST) { element, diagnostic ->
             val expression = RemoveRightPartOfBinaryExpressionFix(element, "").invoke()

j2k/src/org/jetbrains/kotlin/j2k/CodeConverter.kt

@@ -63,10 +63,14 @@ class CodeConverter(
     public fun convertExpressions(expressions: List<PsiExpression>): List<Expression>
             = expressions.map { convertExpression(it) }
 
-    public fun convertExpression(expression: PsiExpression?): Expression {
+    public fun convertExpression(expression: PsiExpression?, shouldParenthesize: Boolean = false): Expression {
         if (expression == null) return Expression.Empty
 
-        return expressionConverter.convertExpression(expression, this).assignPrototype(expression)
+        val converted = expressionConverter.convertExpression(expression, this).assignPrototype(expression)
+        if (shouldParenthesize) {
+            return ParenthesizedExpression(converted).assignNoPrototype()
+        }
+        return converted
     }
 
     public fun convertLocalVariable(variable: PsiLocalVariable): LocalVariable {

j2k/src/org/jetbrains/kotlin/j2k/ExpressionConverter.kt

@@ -268,7 +268,7 @@ class DefaultExpressionConverter : JavaElementVisitor(), ExpressionConverter {
                     val isExtension = property.isExtensionDeclaration()
                     val propertyAccess = if (isTopLevel) {
                         if (isExtension)
-                            QualifiedExpression(codeConverter.convertExpression(arguments.firstOrNull()), propertyName).assignNoPrototype()
+                            QualifiedExpression(codeConverter.convertExpression(arguments.firstOrNull(), true), propertyName).assignNoPrototype()
                         else
                             propertyName
                     }
@@ -293,7 +293,7 @@ class DefaultExpressionConverter : JavaElementVisitor(), ExpressionConverter {
             else if (origin is KtFunction) {
                 if (isTopLevel) {
                     result = if (origin.isExtensionDeclaration()) {
-                        val qualifier = codeConverter.convertExpression(arguments.firstOrNull())
+                        val qualifier = codeConverter.convertExpression(arguments.firstOrNull(), true)
                         MethodCallExpression.build(qualifier,
                                                    origin.name!!,
                                                    convertArguments(expression, isExtension = true),
@@ -314,7 +314,7 @@ class DefaultExpressionConverter : JavaElementVisitor(), ExpressionConverter {
                 val resolvedQualifier = (methodExpr.qualifier as? PsiReferenceExpression)?.resolve()
                 if (isFacadeClassFromLibrary(resolvedQualifier)) {
                     result = if (target.isKotlinExtensionFunction()) {
-                        val qualifier = codeConverter.convertExpression(arguments.firstOrNull())
+                        val qualifier = codeConverter.convertExpression(arguments.firstOrNull(), true)
                         MethodCallExpression.build(qualifier,
                                                    methodExpr.referenceName!!,
                                                    convertArguments(expression, isExtension = true),

j2k/src/org/jetbrains/kotlin/j2k/SpecialMethod.kt

@@ -306,7 +306,7 @@ enum class SpecialMethod(val qualifiedClassName: String?, val methodName: String
 
         override fun convertCall(qualifier: PsiExpression?, arguments: Array<PsiExpression>, typeArgumentsConverted: List<Type>, codeConverter: CodeConverter): Expression? {
             if (arguments.size < 2) return null // incorrect call
-            return MethodCallExpression.build(codeConverter.convertExpression(arguments[1]), "format", codeConverter.convertExpressions(listOf(arguments[0]) + arguments.drop(2)), emptyList(), false)
+            return MethodCallExpression.build(codeConverter.convertExpression(arguments[1], true), "format", codeConverter.convertExpressions(listOf(arguments[0]) + arguments.drop(2)), emptyList(), false)
         }
     },
 
@@ -319,7 +319,7 @@ enum class SpecialMethod(val qualifiedClassName: String?, val methodName: String
 
         override fun convertCall(qualifier: PsiExpression?, arguments: Array<PsiExpression>, typeArgumentsConverted: List<Type>, codeConverter: CodeConverter): Expression? {
             if (arguments.isEmpty()) return null // incorrect call
-            return MethodCallExpression.build(codeConverter.convertExpression(arguments.first()), "format", codeConverter.convertExpressions(arguments.drop(1)), emptyList(), false)
+            return MethodCallExpression.build(codeConverter.convertExpression(arguments.first(), true), "format", codeConverter.convertExpressions(arguments.drop(1)), emptyList(), false)
         }
     },
 
@@ -347,7 +347,7 @@ enum class SpecialMethod(val qualifiedClassName: String?, val methodName: String
 
     STRING_VALUE_OF(JAVA_LANG_STRING, "valueOf", 1) {
         override fun convertCall(qualifier: PsiExpression?, arguments: Array<PsiExpression>, typeArgumentsConverted: List<Type>, codeConverter: CodeConverter)
-                = MethodCallExpression.build(codeConverter.convertExpression(arguments.single()), "toString", emptyList(), emptyList(), false)
+                = MethodCallExpression.build(codeConverter.convertExpression(arguments.single(), true), "toString", emptyList(), emptyList(), false)
     },
 
     SYSTEM_OUT_PRINTLN(PrintStream::class.java.name, "println", null) {
@@ -412,7 +412,7 @@ private fun convertSystemOutMethodCall(
 }
 
 private fun CodeConverter.convertToRegex(expression: PsiExpression?): Expression
-        = MethodCallExpression.build(convertExpression(expression), "toRegex", emptyList(), emptyList(), false).assignNoPrototype()
+        = MethodCallExpression.build(convertExpression(expression, true), "toRegex", emptyList(), emptyList(), false).assignNoPrototype()
 
 private fun addIgnoreCaseArgument(
         qualifier: PsiExpression?,

j2k/testData/fileOrElement/assertStatement/onlyConditionWithBraces.kt

@@ -1 +1 @@
-assert((boolMethod()))
+assert(boolMethod())

j2k/testData/fileOrElement/methodCallExpression/parameterToReceiver.java

@@ -0,0 +1,7 @@
+//method
+public static void adjust(String name, int maxLen) {
+    String.format("%-" + maxLen + "s", name);
+    String.valueOf(1 + 1);
+    "a".split("\\s+" + "\\s+", 2)
+    kotlinApi.KotlinApiKt.extensionFunction(1 + 1)
+}

j2k/testData/fileOrElement/methodCallExpression/parameterToReceiver.kt

@@ -0,0 +1,6 @@
+fun adjust(name: String, maxLen: Int) {
+    ("%-" + maxLen + "s").format(name)
+    (1 + 1).toString()
+    "a".split(("\\s+" + "\\s+").toRegex(), 2).toTypedArray()
+    (1 + 1).extensionFunction()
+}

j2k/testData/fileOrElement/nullability/VariableInitializedWithTernaryNull.kt

@@ -1,4 +1,4 @@
 // !specifyLocalVariableTypeByDefault: true
 fun foo(b: Boolean) {
-    val s: String? = (if (b) "abc" else null)
+    val s: String? = if (b) "abc" else null
 }

j2k/testData/fileOrElement/parenthesizedExpression/parenthesized.java

@@ -1,2 +1,2 @@
 //expression
-(1 + 2)
+(1 + 2).foo()

j2k/testData/fileOrElement/parenthesizedExpression/parenthesized.kt

@@ -1 +1 @@
-(1 + 2)
+(1 + 2).foo()

j2k/testData/fileOrElement/parenthesizedExpression/parenthesized2.java

@@ -1,2 +1,2 @@
 //expression
-(str.toString() + "abc")
+(str.toString() + "abc").foo()

j2k/testData/fileOrElement/parenthesizedExpression/parenthesized2.kt

@@ -1 +1 @@
-(str.toString() + "abc")
+(str.toString() + "abc").foo()

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

@@ -3091,6 +3091,12 @@ public class JavaToKotlinConverterForWebDemoTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("parameterToReceiver.java")
+        public void testParameterToReceiver() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/methodCallExpression/parameterToReceiver.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("simpleCall.java")
         public void testSimpleCall() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/methodCallExpression/simpleCall.java");

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

@@ -3091,6 +3091,12 @@ public class JavaToKotlinConverterSingleFileTestGenerated extends AbstractJavaTo
             doTest(fileName);
         }
 
+        @TestMetadata("parameterToReceiver.java")
+        public void testParameterToReceiver() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/methodCallExpression/parameterToReceiver.java");
+            doTest(fileName);
+        }
+
         @TestMetadata("simpleCall.java")
         public void testSimpleCall() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("j2k/testData/fileOrElement/methodCallExpression/simpleCall.java");