/
commandmanager.go
259 lines (229 loc) · 4.81 KB
/
commandmanager.go
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package main
import (
"fmt"
"strings"
"sync"
. "github.com/xaxys/oasis/api"
)
type ConsoleCaller struct{}
var consoleCaller ConsoleCaller
const PredictionThreshold = 10
var commandManagerLock sync.Mutex
var commandManager *oasisCommandManager
type oasisCommandManager struct {
commandMap *trie
pluginMap map[Plugin]map[string]*trieNode
}
func getCommandManager() *oasisCommandManager {
if commandManager == nil {
commandManagerLock.Lock()
if commandManager == nil {
commandManager = newCommandManager()
}
commandManagerLock.Unlock()
}
return commandManager
}
func newCommandManager() *oasisCommandManager {
return &oasisCommandManager{
commandMap: newTrie(),
pluginMap: map[Plugin]map[string]*trieNode{},
}
}
func (cm *oasisCommandManager) ExcuteCommand(caller CommandCaller, sentence string) bool {
if sentence == "" {
return false
}
defer func() {
if r := recover(); r != nil {
getLogger().Errorf("Recovered from panic: %v", r)
}
}()
var callerName string
var p Plugin = nil
if _, ok := caller.(ConsoleCaller); ok {
callerName = "[Console]"
} else if p, ok = caller.(Plugin); ok {
callerName = fmt.Sprint(p)
} else {
return false
}
args := strings.Split(sentence, " ")
command := strings.ToLower(args[0])
if len(args) > 1 {
args = args[1:]
} else {
args = []string{}
}
getLogger().Infof("%s issued command: %s", callerName, sentence)
c, ok := cm.commandMap.Get(command)
if ok {
c.OnCommand(p, command, args)
return true
} else {
getLogger().Infof("Command: %s is not found.", command)
return false
}
}
func (cm *oasisCommandManager) RegisterCommand(command string, p Plugin, ce CommandExcutor) bool {
command = strings.ToLower(command)
c := &CommandEntry{
Command: command,
Plugin: p,
CommandExcutor: ce,
}
node, ok := cm.commandMap.Insert(c)
if ok {
if cm.pluginMap[p] == nil {
cm.pluginMap[p] = map[string]*trieNode{}
}
cm.pluginMap[p][command] = node
return true
} else {
return false
}
}
func (cm *oasisCommandManager) UnregisterCommand(command string) bool {
c, ok := cm.commandMap.Delete(command)
if ok {
delete(cm.pluginMap[c.Plugin], command)
return true
} else {
return false
}
}
func (cm *oasisCommandManager) UnregisterPluginCommand(p Plugin) {
for _, v := range cm.pluginMap[p] {
v.content = nil
cm.commandMap.Update(v)
}
delete(cm.pluginMap, p)
}
func (cm *oasisCommandManager) GetPrediction(command string, force bool) (int, []CommandEntry) {
num := cm.commandMap.Count(command)
if num > PredictionThreshold && !force || num == 0 {
return num, nil
} else {
var list []CommandEntry
list = append(list, cm.commandMap.Contents(command)...)
return num, list
}
}
func (cm *oasisCommandManager) GetPluginCommands(p Plugin) []CommandEntry {
var list []CommandEntry
if cm.pluginMap[p] != nil {
for _, v := range cm.pluginMap[p] {
list = append(list, *(v.content))
}
}
return list
}
// Trie
type trie struct {
root *trieNode
}
type trieNode struct {
count int
father *trieNode
children map[byte]*trieNode
content *CommandEntry
}
func newTrieNode(father *trieNode) *trieNode {
return &trieNode{
count: 0,
father: father,
children: make(map[byte]*trieNode),
}
}
func newTrie() *trie {
return &trie{
root: newTrieNode(nil),
}
}
func (t *trie) get(key string) (*trieNode, bool) {
b := []byte(key)
x := t.root
for _, c := range b {
next, ok := x.children[c]
if !ok {
return nil, false
}
x = next
}
return x, true
}
func (t *trie) Get(key string) (*CommandEntry, bool) {
x, ok := t.get(key)
if ok && x.content != nil {
return x.content, true
} else {
return nil, false
}
}
func (t *trie) Insert(value *CommandEntry) (*trieNode, bool) {
b := []byte(value.Command)
x := t.root
for _, c := range b {
next, ok := x.children[c]
if !ok {
n := newTrieNode(x)
x.children[c] = n
next = n
}
x = next
}
if x.content != nil {
return nil, false
}
x.content = value
t.Update(x)
return x, true
}
func (t *trie) Update(node *trieNode) {
x := node
for x != nil {
x.count = 0
for _, v := range x.children {
x.count += v.count
}
if x.content != nil {
x.count++
}
x = x.father
}
}
func (t *trie) Delete(key string) (*CommandEntry, bool) {
x, ok := t.get(key)
if ok && x.content != nil {
content := x.content
x.content = nil
t.Update(x)
return content, true
} else {
return nil, false
}
}
func (t *trie) Count(key string) int {
x, ok := t.get(key)
if !ok {
return 0
} else {
return x.count
}
}
func (t *trie) Contents(key string) []CommandEntry {
x, ok := t.get(key)
if !ok {
return nil
} else {
return t.contents(x)
}
}
func (t *trie) contents(node *trieNode) []CommandEntry {
var list []CommandEntry
for _, v := range node.children {
list = append(list, t.contents(v)...)
}
list = append(list, *node.content)
return list
}