[FIR] Extract java synthetic names calculation to platform specific component

compiler/fir/jvm/src/org/jetbrains/kotlin/fir/resolve/FirJavaSyntheticNamesProvider.kt

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.resolve
+
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.resolve.calls.FirSyntheticNamesProvider
+import org.jetbrains.kotlin.load.java.propertyNameByGetMethodName
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.util.capitalizeDecapitalize.capitalizeAsciiOnly
+import org.jetbrains.kotlin.util.capitalizeDecapitalize.capitalizeFirstWord
+
+object FirJavaSyntheticNamesProvider : FirSyntheticNamesProvider() {
+    private const val GETTER_PREFIX = "get"
+    private const val IS_PREFIX = "is"
+
+    override fun possibleGetterNamesByPropertyName(name: Name): List<Name> {
+        if (name.isSpecial) return emptyList()
+        val identifier = name.identifier
+        val capitalizedAsciiName = identifier.capitalizeAsciiOnly()
+        val capitalizedFirstWordName = identifier.capitalizeFirstWord(asciiOnly = true)
+        return listOfNotNull(
+            Name.identifier(GETTER_PREFIX + capitalizedAsciiName),
+            if (capitalizedFirstWordName == capitalizedAsciiName) null else Name.identifier(GETTER_PREFIX + capitalizedFirstWordName),
+            name.takeIf { identifier.startsWith(IS_PREFIX) }
+        ).filter {
+            propertyNameByGetMethodName(it) == name
+        }
+    }
+
+    override fun setterNameByGetterName(name: Name): Name {
+        val identifier = name.identifier
+        val prefix = when {
+            identifier.startsWith("get") -> "get"
+            identifier.startsWith("is") -> "is"
+            else -> throw IllegalArgumentException()
+        }
+        return Name.identifier("set" + identifier.removePrefix(prefix))
+    }
+}
+
+fun FirSession.registerJavaSyntheticNamesProvider() {
+    register(FirSyntheticNamesProvider::class, FirJavaSyntheticNamesProvider)
+}