scalafix.util.TokenOps.scala Maven / Gradle / Ivy

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package scalafix.util

import scala.meta.tokens.Token

object TokenOps {

  /** Returns true if this token is an identifier that requires a leading space before colon.
   *
   * Example:
   *   needsLeadingSpaceBeforeColon(foo_) // true
   *   needsLeadingSpaceBeforeColon(foo)  // false
   *   val foo_ : Int = 2 // OK
   *   val foo_: Int = 2  // ERROR
   *   val foo: Int = 2   // OK
   *
    **/
  def needsLeadingSpaceBeforeColon(ident: Token): Boolean = ident match {
    case Token.Ident(_) =>
      ident.syntax.lastOption.exists {
        case '`' => false
        case ch => !ch.isLetterOrDigit
      }
    case _ => false
  }
}