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Scala GraphQL implementation

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package sangria.validation.rules

import sangria.ast
import sangria.ast.AstVisitorCommand
import sangria.validation._

/** Executable definitions
  *
  * A GraphQL document is only valid for execution if all definitions are either operation or
  * fragment definitions.
  */
class ExecutableDefinitions extends ValidationRule {
  override def visitor(ctx: ValidationContext): AstValidatingVisitor = new AstValidatingVisitor {
    override val onEnter: ValidationVisit = { case ast.Document(definitions, _, _, _) =>
      val errors =
        definitions.collect {
          case d
              if !d.isInstanceOf[ast.OperationDefinition] && !d
                .isInstanceOf[ast.FragmentDefinition] =>
            NonExecutableDefinitionViolation(
              definitionName(d),
              d,
              ctx.sourceMapper,
              d.location.toList)
        }

      if (errors.nonEmpty) Left(errors)
      else AstVisitorCommand.RightContinue
    }
  }

  def definitionName(definition: ast.Definition): String = definition match {
    case d: ast.FragmentDefinition => d.name
    case d: ast.OperationDefinition => d.name.getOrElse("unnamed operation")
    case d: ast.TypeDefinition => d.name
    case d: ast.DirectiveDefinition => d.name
    case _: ast.SchemaDefinition => "schema"
    case d: ast.TypeExtensionDefinition => d.name
    case _: ast.SchemaExtensionDefinition => "schema"
  }
}