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