Remove router package
This commit is contained in:
lash
parent
b78e28622a
commit
de20c27877
GPG Key ID:
21D2E7BB88C2A746
@ -1,135 +0,0 @@
|
||||
package router
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
)
|
||||
|
||||
// Router contains and parses the routing section of the bytecode for a node.
|
||||
type Router struct {
|
||||
selectors []string
|
||||
symbols map[string]string
|
||||
}
|
||||
|
||||
// NewRouter creates a new Router object.
|
||||
func NewRouter() Router {
|
||||
return Router{
|
||||
symbols: make(map[string]string),
|
||||
}
|
||||
}
|
||||
|
||||
// NewStaticRouter creates a new Router object with a single destination.
|
||||
//
|
||||
// Used for routes that consume input value instead of navigation choices.
|
||||
func NewStaticRouter(symbol string) Router {
|
||||
return Router{
|
||||
symbols: map[string]string{"_": symbol},
|
||||
}
|
||||
}
|
||||
|
||||
// Add associates a selector with a destination symbol.
|
||||
//
|
||||
// Fails if:
|
||||
// - selector or symbol value is invalid
|
||||
// - selector already exists
|
||||
func(r *Router) Add(selector string, symbol string) error {
|
||||
if r.symbols[selector] != "" {
|
||||
return fmt.Errorf("selector %v already set to symbol %v", selector, symbol)
|
||||
}
|
||||
l := len(selector)
|
||||
if (l > 255) {
|
||||
return fmt.Errorf("selector too long (is %v, max 255)", l)
|
||||
}
|
||||
if selector[0] == '_' {
|
||||
return fmt.Errorf("Invalid selector prefix '_'")
|
||||
}
|
||||
l = len(symbol)
|
||||
if (l > 255) {
|
||||
return fmt.Errorf("symbol too long (is %v, max 255)", l)
|
||||
}
|
||||
r.selectors = append(r.selectors, selector)
|
||||
r.symbols[selector] = symbol
|
||||
return nil
|
||||
}
|
||||
|
||||
// Get retrieve symbol for selector.
|
||||
//
|
||||
// Returns an empty string if selector does not exist.
|
||||
//
|
||||
// Will always return an empty string if the router is static.
|
||||
func(r *Router) Get(selector string) string {
|
||||
return r.symbols[selector]
|
||||
}
|
||||
|
||||
// Get the statically defined symbol destination.
|
||||
//
|
||||
// Returns an empty string if not a static router.
|
||||
func(r *Router) Default() string {
|
||||
return r.symbols["_"]
|
||||
}
|
||||
|
||||
// Next removes one selector from the list of registered selectors.
|
||||
//
|
||||
// It returns it together with it associated value in bytecode form.
|
||||
//
|
||||
// Returns an empty byte array if no more selectors remain.
|
||||
func(r *Router) Next() []byte {
|
||||
if len(r.selectors) == 0 {
|
||||
return []byte{}
|
||||
}
|
||||
k := r.selectors[0]
|
||||
r.selectors = r.selectors[1:]
|
||||
v := r.symbols[k]
|
||||
if len(r.selectors) == 0 {
|
||||
r.symbols = nil
|
||||
} else {
|
||||
delete(r.symbols, k)
|
||||
}
|
||||
lk := len(k)
|
||||
lv := len(v)
|
||||
b := []byte{uint8(lk)}
|
||||
b = append(b, k...)
|
||||
b = append(b, uint8(lv))
|
||||
b = append(b, v...)
|
||||
return b
|
||||
}
|
||||
|
||||
// ToBytes consume all selectors and values and returns them in sequence in bytecode form.
|
||||
//
|
||||
// This is identical to concatenating all returned values from non-empty Next() results.
|
||||
func(r *Router) ToBytes() []byte {
|
||||
b := []byte{}
|
||||
for true {
|
||||
v := r.Next()
|
||||
if len(v) == 0 {
|
||||
break
|
||||
}
|
||||
b = append(b, v...)
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
// Restore a Router from bytecode.
|
||||
//
|
||||
// FromBytes(ToBytes()) creates an identical object.
|
||||
func FromBytes(b []byte) Router {
|
||||
rb := NewRouter()
|
||||
navigable := true
|
||||
for len(b) > 0 {
|
||||
var k string
|
||||
l := b[0]
|
||||
if l == 0 {
|
||||
navigable = false
|
||||
} else {
|
||||
k = string(b[1:1+l])
|
||||
b = b[1+l:]
|
||||
}
|
||||
l = b[0]
|
||||
v := string(b[1:1+l])
|
||||
if !navigable {
|
||||
return NewStaticRouter(v)
|
||||
}
|
||||
b = b[1+l:]
|
||||
rb.Add(k, v)
|
||||
}
|
||||
return rb
|
||||
}
|
||||
@ -1,89 +0,0 @@
|
||||
package router
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestRouter(t *testing.T) {
|
||||
r := NewRouter()
|
||||
err := r.Add("foo", "bar")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
err = r.Add("baz", "barbarbar")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
err = r.Add("foo", "xyzzy")
|
||||
if err == nil {
|
||||
t.Errorf("expected error for duplicate key foo")
|
||||
}
|
||||
}
|
||||
|
||||
func TestRouterOut(t *testing.T) {
|
||||
rt := NewRouter()
|
||||
err := rt.Add("foo", "inky")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
err = rt.Add("barbar", "pinky")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
err = rt.Add("bazbazbaz", "blinky")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
rb := []byte{}
|
||||
r := rt.Next()
|
||||
expect := append([]byte{0x3}, []byte("foo")...)
|
||||
expect = append(expect, 4)
|
||||
expect = append(expect, []byte("inky")...)
|
||||
if !bytes.Equal(r, expect) {
|
||||
t.Errorf("expected %v, got %v", expect, r)
|
||||
}
|
||||
rb = append(rb, r...)
|
||||
|
||||
r = rt.Next()
|
||||
expect = append([]byte{0x6}, []byte("barbar")...)
|
||||
expect = append(expect, 5)
|
||||
expect = append(expect, []byte("pinky")...)
|
||||
if !bytes.Equal(r, expect) {
|
||||
t.Errorf("expected %v, got %v", expect, r)
|
||||
}
|
||||
rb = append(rb, r...)
|
||||
|
||||
r = rt.Next()
|
||||
expect = append([]byte{0x9}, []byte("bazbazbaz")...)
|
||||
expect = append(expect, 6)
|
||||
expect = append(expect, []byte("blinky")...)
|
||||
if !bytes.Equal(r, expect) {
|
||||
t.Errorf("expected %v, got %v", expect, r)
|
||||
}
|
||||
rb = append(rb, r...)
|
||||
}
|
||||
|
||||
func TestSerialize(t *testing.T) {
|
||||
rt := NewRouter()
|
||||
err := rt.Add("foo", "inky")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
err = rt.Add("barbar", "pinky")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
err = rt.Add("bazbazbaz", "blinky")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
|
||||
// Serialize and deserialize.
|
||||
ra := rt.ToBytes()
|
||||
rt = FromBytes(ra)
|
||||
rb := rt.ToBytes()
|
||||
if !bytes.Equal(ra, rb) {
|
||||
t.Errorf("expected %v, got %v", ra, rb)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user