const (
	NodeText    NodeType = iota // Plain text.
	NodeAction                  // A non-control action such as a field evaluation.
	NodeBool                    // A boolean constant.
	NodeChain                   // A sequence of field accesses.
	NodeCommand                 // An element of a pipeline.
	NodeDot                     // The cursor, dot.
	// contains filtered or unexported fields
	NodeField      // A field or method name.
	NodeIdentifier // An identifier; always a function name.
	NodeIf         // An if action.
	NodeList       // A list of Nodes.
	NodeNil        // An untyped nil constant.
	NodeNumber     // A numerical constant.
	NodePipe       // A pipeline of commands.
	NodeRange      // A range action.
	NodeString     // A string constant.
	NodeTemplate   // A template invocation action.
	NodeVariable   // A $ variable.
	NodeWith       // A with action.
)