private IEnumerable <string> BeginSnippetLine(XmlSnippet snippet) =>
 new[] { this.BeginSnippetStatement(snippet) };
 private string BeginSnippetStatement(XmlSnippet snippet) =>
 $"snippet {snippet.Number:00} until {this.EndSnippet}";
 private IEnumerable <string> GetScriptLines(XmlSnippet snippet) =>
 this.BeginSnippetLine(snippet)
 .Concat(snippet.CodeLines.AppendToLast(this.EndSnippet));