org.scalajs.ir.OriginalName.scala Maven / Gradle / Ivy
/*
* Scala.js (https://www.scala-js.org/)
*
* Copyright EPFL.
*
* Licensed under Apache License 2.0
* (https://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package org.scalajs.ir
import Names._
/** An optional original name.
*
* Since an `OriginalName` is basically an optional `UTF8String`, original
* names must always be well-formed Unicode strings. Unpaired surrogates are
* not valid.
*/
final class OriginalName private (private val bytes: Array[Byte])
extends AnyVal {
/* The underlying field is a `bytes` instead of a `UTF8String` for two
* reasons:
* - a `UTF8String` cannot be `null`, and
* - the underlying val of a value class cannot itself be a custom value
* class.
*/
def isEmpty: Boolean = bytes == null
def isDefined: Boolean = bytes != null
/** Gets the underlying `UTF8String` without checking for emptiness. */
@inline private def unsafeGet: UTF8String =
UTF8String.unsafeCreate(bytes)
def get: UTF8String = {
if (isEmpty)
throw new NoSuchElementException("NoOriginalName.get")
unsafeGet
}
def orElse(name: Name): OriginalName =
orElse(name.encoded)
def orElse(name: MethodName): OriginalName =
orElse(name.simpleName)
def orElse(name: UTF8String): OriginalName =
if (isDefined) this
else OriginalName(name)
def getOrElse(name: Name): UTF8String =
getOrElse(name.encoded)
def getOrElse(name: MethodName): UTF8String =
getOrElse(name.simpleName)
def getOrElse(name: UTF8String): UTF8String =
if (isDefined) unsafeGet
else name
def getOrElse(name: String): UTF8String = {
/* Do not use `getOrElse(UTF8Sring(name))` so that we do not pay the cost
* of encoding the `name` in UTF-8 if `this.isDefined`.
*/
if (isDefined) unsafeGet
else UTF8String(name)
}
override def toString(): String =
if (isDefined) s"OriginalName($unsafeGet)"
else "NoOriginalName"
}
object OriginalName {
val NoOriginalName: OriginalName = new OriginalName(null)
def apply(name: UTF8String): OriginalName =
new OriginalName(name.bytes)
def apply(name: Name): OriginalName =
apply(name.encoded)
def apply(name: MethodName): OriginalName =
apply(name.simpleName)
def apply(name: String): OriginalName =
apply(UTF8String(name))
}