dotty.tools.dotc.classpath.PackageNameUtils.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2014 Contributor. All rights reserved.
 */
package dotty.tools.dotc.classpath

import dotty.tools.io.ClassPath.RootPackage

/**
 * Common methods related to package names represented as String
 */
object PackageNameUtils {

  /**
   * @param fullClassName full class name with package
   * @return (package, simple class name)
   */
  inline def separatePkgAndClassNames(fullClassName: String): (String, String) = {
    val lastDotIndex = fullClassName.lastIndexOf('.')
    if (lastDotIndex == -1)
      (RootPackage, fullClassName)
    else
      (fullClassName.substring(0, lastDotIndex).nn, fullClassName.substring(lastDotIndex + 1).nn)
  }

  def packagePrefix(inPackage: String): String = if (inPackage == RootPackage) "" else inPackage + "."

  /**
   * `true` if `packageDottedName` is a package directly nested in `inPackage`, for example:
   *   - `packageContains("scala", "scala.collection")`
   *   - `packageContains("", "scala")`
   */
  def packageContains(inPackage: String, packageDottedName: String) = {
    if (packageDottedName.contains("."))
      packageDottedName.startsWith(inPackage) && packageDottedName.lastIndexOf('.') == inPackage.length
    else inPackage == ""
  }
}