func (p *Trie) outputDot(vec *vector.StringVector, rune int, serial int64, rgen *rand.Rand) {
this := make([]byte, 10)
child := make([]byte, 10)
utf8.EncodeRune(this, rune)
thisChar := string(this[0])
if serial == -1 {
thisChar = "root"
}
for childRune, childNode := range p.children {
utf8.EncodeRune(child, childRune)
childSerial := rgen.Int63()
childNodeStr := fmt.Sprintf("\"%s(%d)\"", string(child[0]), childSerial)
var notation string
if string(child[0]) == "/" {
notation = fmt.Sprintf("[label=\"%s\" shape=box color=red]", string(child[0]))
} else {
notation = fmt.Sprintf("[label=\"%s\"]", string(child[0]))
}
vec.Push(fmt.Sprintf("\t%s %s\n\t\"%s(%d)\" -> \"%s(%d)\"", childNodeStr, notation, thisChar, serial, string(child[0]), childSerial))
childNode.outputDot(vec, childRune, childSerial, rgen)
}
}
// randInt64 returns a random integer taking half the range of an int64.
func randInt64(rand *rand.Rand) int64 { return rand.Int63() - 1<<62 }