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router.go
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router.go
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package kit
import (
"bytes"
"fmt"
"sort"
"strings"
)
type Router struct {
parent *Router
operators []Operator
children map[*Router]bool
}
func NewRouter(operators ...Operator) *Router {
ops := make([]Operator, 0)
for i := range operators {
op := operators[i]
if with, ok := op.(WithMiddleOperators); ok {
ops = append(ops, with.MiddleOperators()...)
}
ops = append(ops, op)
}
return &Router{
operators: ops,
}
}
func (r *Router) Register(x *Router) {
if r.children == nil {
r.children = map[*Router]bool{}
}
if x.parent != nil {
panic(fmt.Errorf("router %v already registered to router %v", x, x.parent))
}
x.parent = r
r.children[x] = true
}
func (r *Router) route() *Route {
parent := r.parent
operators := r.operators
for parent != nil {
operators = append(parent.operators, operators...)
parent = parent.parent
}
return &Route{
Operators: operators,
last: len(r.children) == 0,
}
}
func (r *Router) Routes() (routes Routes) {
maybeAppendRoute := func(router *Router) {
route := router.route()
if route.last && len(route.Operators) > 0 {
routes = append(routes, route)
}
if len(router.children) > 0 {
routes = append(routes, router.Routes()...)
}
}
if len(r.children) == 0 {
maybeAppendRoute(r)
return
}
for child := range r.children {
maybeAppendRoute(child)
}
return
}
type Routes []*Route
func (rs Routes) String() string {
keys := make([]string, len(rs))
for i, r := range rs {
keys[i] = r.String()
}
sort.Strings(keys)
return strings.Join(keys, "\n")
}
type Route struct {
Operators []Operator
last bool
}
func (rs *Route) OperatorFactories() (factories []*OperatorFactory) {
length := len(rs.Operators)
for i, op := range rs.Operators {
factories = append(factories, NewOperatorFactory(op, i == length-1))
}
return
}
func (rs *Route) String() string {
buf := &bytes.Buffer{}
factories := rs.OperatorFactories()
for i, operatorFactory := range factories {
if i > 0 {
buf.WriteString(" |> ")
}
buf.WriteString(operatorFactory.String())
}
return buf.String()
}