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package kong
import (
"fmt"
)
// Next should be called by Visitor to proceed with the walk.
//
// The walk will terminate if "err" is non-nil.
type Next func(err error) error
// Visitor can be used to walk all nodes in the model.
type Visitor func(node Visitable, next Next) error
// Visit all nodes.
func Visit(node Visitable, visitor Visitor) error {
return visitor(node, func(err error) error {
if err != nil {
return err
}
switch node := node.(type) {
case *Application:
return visitNodeChildren(node.Node, visitor)
case *Node:
return visitNodeChildren(node, visitor)
case *Value:
case *Flag:
return Visit(node.Value, visitor)
default:
panic(fmt.Sprintf("unsupported node type %T", node))
}
return nil
})
}
func visitNodeChildren(node *Node, visitor Visitor) error {
if node.Argument != nil {
if err := Visit(node.Argument, visitor); err != nil {
return err
}
}
for _, flag := range node.Flags {
if err := Visit(flag, visitor); err != nil {
return err
}
}
for _, pos := range node.Positional {
if err := Visit(pos, visitor); err != nil {
return err
}
}
for _, child := range node.Children {
if err := Visit(child, visitor); err != nil {
return err
}
}
return nil
}
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