package com.github.codeql

// Functions copied from stdlib/jdk7/src/kotlin/AutoCloseable.kt, which is not available within kotlinc,
// but allows the `.use` pattern to be applied to JDK7 AutoCloseables:

/**
 * Executes the given [block] function on this resource and then closes it down correctly whether an exception
 * is thrown or not.
 *
 * In case if the resource is being closed due to an exception occurred in [block], and the closing also fails with an exception,
 * the latter is added to the [suppressed][java.lang.Throwable.addSuppressed] exceptions of the former.
 *
 * @param block a function to process this [AutoCloseable] resource.
 * @return the result of [block] function invoked on this resource.
 */
public inline fun <T : AutoCloseable?, R> T.useAC(block: (T) -> R): R {
  var exception: Throwable? = null
  try {
      return block(this)
  } catch (e: Throwable) {
      exception = e
      throw e
  } finally {
      this.closeFinallyAC(exception)
  }
}

/**
* Closes this [AutoCloseable], suppressing possible exception or error thrown by [AutoCloseable.close] function when
* it's being closed due to some other [cause] exception occurred.
*
* The suppressed exception is added to the list of suppressed exceptions of [cause] exception.
*/
fun AutoCloseable?.closeFinallyAC(cause: Throwable?) = when {
  this == null -> {}
  cause == null -> close()
  else ->
      try {
          close()
      } catch (closeException: Throwable) {
          cause.addSuppressed(closeException)
      }
}
