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package main
import (
"fmt"
)
type Tree struct {
name string
args []interface{}
}
func NewTree(name string, args ...interface{}) *Tree {
return &Tree{name, args}
}
func (t *Tree) String() string {
s := "(" + t.name
for _, arg := range t.args {
if arg, ok := arg.(*Tree); ok {
s += " " + (*arg).String()
continue
}
if arg, ok := arg.(string); ok {
s += fmt.Sprintf(" %q", arg)
continue
}
s += fmt.Sprintf(" %v", arg)
}
return s + ")"
}
func (t *Tree) Visit(nodename string, action func(t *Tree)) {
if t.name == nodename {
action(t)
}
for _, arg := range t.args {
if child, ok := arg.(*Tree); ok {
child.Visit(nodename, action)
}
}
}
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