Avoid creation expressions by texts

compiler/frontend/src/org/jetbrains/kotlin/psi/psiUtil/jetPsiUtil.kt

@@ -121,7 +121,13 @@ public fun JetClassOrObject.effectiveDeclarations(): List<JetDeclaration> =
 public fun JetClass.isAbstract(): Boolean = isInterface() || hasModifier(JetTokens.ABSTRACT_KEYWORD)
 
 [suppress("UNCHECKED_CAST")]
-public fun <T: PsiElement> PsiElement.replaced(newElement: T): T = replace(newElement) as T
+public inline fun <reified T: PsiElement> PsiElement.replaced(newElement: T): T {
+    val result = replace(newElement)
+    return if (result is T)
+        result
+    else
+        (result as JetParenthesizedExpression).getExpression() as T
+}
 
 [suppress("UNCHECKED_CAST")]
 public fun <T: PsiElement> T.copied(): T = copy() as T

idea/src/org/jetbrains/kotlin/idea/intentions/branchedTransformations/IfThenUtils.kt

@@ -27,6 +27,7 @@ import org.jetbrains.kotlin.idea.refactoring.inline.KotlinInlineValHandler
 import org.jetbrains.kotlin.idea.refactoring.introduce.introduceVariable.KotlinIntroduceVariableHandler
 import org.jetbrains.kotlin.lexer.JetTokens
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.psi.psiUtil.replaced
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.BindingContextUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils
@@ -58,8 +59,6 @@ fun JetExpression.unwrapBlock(): JetExpression {
     return innerExpression
 }
 
-fun JetExpression.isStatement(): Boolean = isUsedAsStatement(this.analyze())
-
 fun JetExpression?.isNullExpression(): Boolean = this?.unwrapBlock()?.getNode()?.getElementType() == JetNodeTypes.NULL
 
 fun JetExpression?.isNullExpressionOrEmptyBlock(): Boolean = this.isNullExpression() || this is JetBlockExpression && this.getStatements().isEmpty()
@@ -81,21 +80,17 @@ fun JetExpression.evaluatesTo(other: JetExpression): Boolean {
 }
 
 fun JetExpression.convertToIfNotNullExpression(conditionLhs: JetExpression, thenClause: JetExpression, elseClause: JetExpression?): JetIfExpression {
-    val condition = JetPsiFactory(this).createExpression("${conditionLhs.getText()} != null")
+    val condition = JetPsiFactory(this).createExpressionByPattern("$0 != null", conditionLhs)
     return this.convertToIfStatement(condition, thenClause, elseClause)
 }
 
 fun JetExpression.convertToIfNullExpression(conditionLhs: JetExpression, thenClause: JetExpression): JetIfExpression {
-    val condition = JetPsiFactory(this).createExpression("${conditionLhs.getText()} == null")
-    return this.convertToIfStatement(condition, thenClause, null)
+    val condition = JetPsiFactory(this).createExpressionByPattern("$0 == null", conditionLhs)
+    return this.convertToIfStatement(condition, thenClause)
 }
 
-fun JetExpression.convertToIfStatement(condition: JetExpression, thenClause: JetExpression, elseClause: JetExpression?): JetIfExpression {
-    val elseBranch = if (elseClause == null) "" else " else ${elseClause.getText()}"
-    val conditionalString = "if (${condition.getText()}) ${thenClause.getText()}$elseBranch"
-
-    val st = this.replace(conditionalString) as JetExpression
-    return JetPsiUtil.deparenthesize(st) as JetIfExpression
+fun JetExpression.convertToIfStatement(condition: JetExpression, thenClause: JetExpression, elseClause: JetExpression? = null): JetIfExpression {
+    return replaced(JetPsiFactory(this).createIf(condition, thenClause, elseClause))
 }
 
 fun JetIfExpression.introduceValueForCondition(occurrenceInThenClause: JetExpression, editor: Editor) {
@@ -108,9 +103,6 @@ fun JetIfExpression.introduceValueForCondition(occurrenceInThenClause: JetExpres
                                                  null)
 }
 
-fun JetElement.replace(expressionAsString: String): PsiElement =
-        this.replace(JetPsiFactory(this).createExpression(expressionAsString))
-
 fun JetSimpleNameExpression.inlineIfDeclaredLocallyAndOnlyUsedOnceWithPrompt(editor: Editor) {
     val declaration = this.getReference()?.resolve() as JetDeclaration
 

idea/src/org/jetbrains/kotlin/idea/intentions/branchedTransformations/intentions/DoubleBangToIfThenIntention.kt

@@ -24,6 +24,7 @@ import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiDocumentManager
 import org.apache.commons.lang.StringEscapeUtils.escapeJava
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.intentions.JetSelfTargetingRangeIntention
 import org.jetbrains.kotlin.idea.intentions.JetTypeLookupExpression
 import org.jetbrains.kotlin.idea.intentions.branchedTransformations.*
@@ -32,6 +33,7 @@ import org.jetbrains.kotlin.psi.JetPostfixExpression
 import org.jetbrains.kotlin.psi.JetPsiFactory
 import org.jetbrains.kotlin.psi.JetPsiUtil
 import org.jetbrains.kotlin.psi.JetThrowExpression
+import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsStatement
 
 public class DoubleBangToIfThenIntention : JetSelfTargetingRangeIntention<JetPostfixExpression>(javaClass(), "Replace '!!' expression with 'if' expression") {
     override fun applicabilityRange(element: JetPostfixExpression): TextRange? {
@@ -44,7 +46,7 @@ public class DoubleBangToIfThenIntention : JetSelfTargetingRangeIntention<JetPos
 
         val defaultException = JetPsiFactory(element).createExpression("throw NullPointerException()")
 
-        val isStatement = element.isStatement()
+        val isStatement = element.isUsedAsStatement(element.analyze())
         val isStable = base.isStableVariable()
 
         val ifStatement = if (isStatement)

idea/src/org/jetbrains/kotlin/idea/intentions/branchedTransformations/intentions/IfThenToDoubleBangIntention.kt

@@ -18,10 +18,12 @@ package org.jetbrains.kotlin.idea.intentions.branchedTransformations.intentions
 
 import com.intellij.openapi.editor.Editor
 import com.intellij.openapi.util.TextRange
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.intentions.JetSelfTargetingRangeIntention
 import org.jetbrains.kotlin.idea.intentions.branchedTransformations.*
 import org.jetbrains.kotlin.lexer.JetTokens
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsStatement
 
 public class IfThenToDoubleBangIntention : JetSelfTargetingRangeIntention<JetIfExpression>(javaClass(), "Replace 'if' expression with '!!' expression") {
     override fun applicabilityRange(element: JetIfExpression): TextRange? {
@@ -49,7 +51,7 @@ public class IfThenToDoubleBangIntention : JetSelfTargetingRangeIntention<JetIfE
             else -> throw IllegalStateException()
         }
 
-        val matchesAsStatement = element.isStatement() && (matchingClause?.isNullExpressionOrEmptyBlock() ?: true)
+        val matchesAsStatement = element.isUsedAsStatement(element.analyze()) && (matchingClause?.isNullExpressionOrEmptyBlock() ?: true)
         if (!matchesAsStatement && !(matchingClause?.evaluatesTo(expression) ?: false && expression.isStableVariable())) return null
 
         var text = "Replace 'if' expression with '!!' expression"

idea/src/org/jetbrains/kotlin/idea/intentions/branchedTransformations/intentions/SafeAccessToIfThenIntention.kt

@@ -17,12 +17,13 @@
 package org.jetbrains.kotlin.idea.intentions.branchedTransformations.intentions
 
 import com.intellij.openapi.editor.Editor
+import org.jetbrains.kotlin.idea.caches.resolve.analyze
 import org.jetbrains.kotlin.idea.intentions.JetSelfTargetingOffsetIndependentIntention
 import org.jetbrains.kotlin.idea.intentions.branchedTransformations.convertToIfNotNullExpression
 import org.jetbrains.kotlin.idea.intentions.branchedTransformations.introduceValueForCondition
 import org.jetbrains.kotlin.idea.intentions.branchedTransformations.isStableVariable
-import org.jetbrains.kotlin.idea.intentions.branchedTransformations.isStatement
 import org.jetbrains.kotlin.psi.*
+import org.jetbrains.kotlin.resolve.bindingContextUtil.isUsedAsStatement
 
 public class SafeAccessToIfThenIntention : JetSelfTargetingOffsetIndependentIntention<JetSafeQualifiedExpression>("safe.access.to.if.then", javaClass()) {
     override fun isApplicableTo(element: JetSafeQualifiedExpression): Boolean = true
@@ -38,7 +39,7 @@ public class SafeAccessToIfThenIntention : JetSelfTargetingOffsetIndependentInte
         val psiFactory = JetPsiFactory(element)
         val dotQualifiedExpression = psiFactory.createExpression("${receiverAsString}.${selector!!.getText()}")
 
-        val elseClause = if (element.isStatement()) null else psiFactory.createExpression("null")
+        val elseClause = if (element.isUsedAsStatement(element.analyze())) null else psiFactory.createExpression("null")
         val ifExpression = element.convertToIfNotNullExpression(receiver, dotQualifiedExpression, elseClause)
 
         if (!receiverIsStable) {