Migrate compiler, idea and others to new case conversion api

generators/evaluate/GenerateOperationsMap.kt

@@ -188,7 +188,7 @@ private fun CallableDescriptor.getParametersTypes(): List<KotlinType> =
     listOf((containingDeclaration as ClassDescriptor).defaultType) +
             valueParameters.map { it.type.makeNotNullable() }
 
-private fun KotlinType.asString(): String = typeName.toUpperCase()
+private fun KotlinType.asString(): String = typeName.uppercase()
 
 private val KotlinType.typeName: String
     get(): String = constructor.declarationDescriptor!!.name.asString()

generators/test-generator/tests/org/jetbrains/kotlin/generators/model/SimpleTestMethodModel.kt

@@ -46,10 +46,10 @@ open class SimpleTestMethodModel(
                 extractedName
             } else {
                 val relativePath = FileUtil.getRelativePath(rootDir, file.parentFile)
-                relativePath + "-" + extractedName.capitalize()
+                relativePath + "-" + extractedName.replaceFirstChar(Char::uppercaseChar)
             }
             val ignored = skipIgnored && InTextDirectivesUtils.isIgnoredTarget(targetBackend, file)
-            return (if (ignored) "ignore" else "test") + escapeForJavaIdentifier(unescapedName).capitalize()
+            return (if (ignored) "ignore" else "test") + escapeForJavaIdentifier(unescapedName).replaceFirstChar(Char::uppercaseChar)
         }
 
     init {

generators/test-generator/tests/org/jetbrains/kotlin/generators/util/TestGeneratorUtil.kt

@@ -31,7 +31,7 @@ object TestGeneratorUtil {
 
     @JvmStatic
     fun fileNameToJavaIdentifier(file: File): String {
-        return escapeForJavaIdentifier(file.name).capitalize()
+        return escapeForJavaIdentifier(file.name).replaceFirstChar(Char::uppercaseChar)
     }
 }
 

generators/tests/org/jetbrains/kotlin/generators/protobuf/GenerateProtoBufCompare.kt

@@ -89,7 +89,7 @@ class GenerateProtoBufCompare {
             }
             return (extensionPrefix + fieldDescriptor.name.javaName + (if (fieldDescriptor.isRepeated) "List" else ""))
                 .replace("[A-Z]".toRegex()) { "_" + it.value }
-                .toUpperCase()
+                .uppercase()
         }
     }
 
@@ -236,7 +236,7 @@ class GenerateProtoBufCompare {
 
     fun generateHashCodeForField(field: Descriptors.FieldDescriptor, p: Printer, isExtensionField: Boolean) {
         val fieldName = field.name.javaName
-        val capFieldName = fieldName.capitalize()
+        val capFieldName = fieldName.replaceFirstChar(Char::uppercaseChar)
         val outerClassName = field.file.options.javaOuterClassname.removePrefix("Debug")
         val fullFieldName = "$outerClassName.$fieldName"
 
@@ -310,7 +310,7 @@ class GenerateProtoBufCompare {
 
         val typeName = field.containingType.typeName
         val fieldName = field.name.javaName
-        val capFieldName = fieldName.capitalize()
+        val capFieldName = fieldName.replaceFirstChar(Char::uppercaseChar)
         val methodName = field.helperMethodName()
 
         p.println()
@@ -357,7 +357,7 @@ class GenerateProtoBufCompare {
 
     open inner class FieldGeneratorImpl(field: Descriptors.FieldDescriptor, p: Printer) : FieldGenerator(field, p) {
         val fieldName = field.name.javaName
-        val capFieldName = fieldName.capitalize()
+        val capFieldName = fieldName.replaceFirstChar(Char::uppercaseChar)
 
         override fun printRepeatedField() {
             repeatedFields.add(field)
@@ -496,12 +496,12 @@ class GenerateProtoBufCompare {
         val packageHeader = this.file.`package`
         val descriptor = this.containingType
         val className = descriptor.fullName.removePrefix(packageHeader).replace(".", "")
-        val capFieldName = this.name.javaName.capitalize()
+        val capFieldName = this.name.javaName.replaceFirstChar(Char::uppercaseChar)
         return "$CHECK_EQUALS_NAME$className$capFieldName"
     }
 
     private val String.javaName: String
-        get() = this.split("_").joinToString("") { it.capitalize() }.decapitalize()
+        get() = this.split("_").joinToString("") { it.replaceFirstChar(Char::uppercaseChar) }.replaceFirstChar(Char::lowercaseChar)
 }
 
 private fun Printer.printlnMultiline(string: String) {