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MUD.go
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MUD.go
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package main
import (
"database/sql"
_ "github.com/mattn/go-sqlite3"
"fmt"
"log"
"bufio"
"os"
"strings"
)
// Struct :
type Zone struct {
ID int
Name string
Rooms []*Room
}
type Room struct {
ID int
Zone *Zone
Name string
Description string
Exits [6]Exit
}
type Exit struct {
To *Room
Description string
}
var Direction = map[string]int {
"n" : 0,
"e" : 1,
"w" : 2,
"s" : 3,
"u" : 4,
"d" : 5,
}
var ReDirection = map[int]string {
0 : "n",
1 : "e",
2 : "w",
3 : "s",
4 : "u",
5 : "d",
}
type Player struct {
FirstName string
LastName string
Location *Room
}
var ALLROOM = make (map[int]*Room)
// Part 1:
var allCommands = make(map[string]func(string, Player))
// the MAKE bulid this type of data set in map and bulid the refrence
func commandLoop(player Player) error {
initCommands()
cmdwhere("", player)
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
line := scanner.Text()
//log.Printf("The line was: %s", line)
doCommand(line, player)
}
if err := scanner.Err(); err != nil {
return fmt.Errorf("in main command loop: %v", err)
}
return nil
}
func addCommand(cmd string, f func(string, Player)) {
for i := range cmd {
if i == 0 {
continue
}
prefix := cmd[:i]
allCommands[prefix] = f
}
allCommands[cmd] = f
}
func initCommands() {
addCommand("look", cmdLook)
addCommand("north", cmdNorth)
addCommand("east", cmdEast)
addCommand("west", cmdWest)
addCommand("south", cmdSouth)
addCommand("up", cmdUp)
addCommand("down", cmdDown)
addCommand("where", cmdwhere)
addCommand("recall", cmdRecall)
addCommand("laugh", cmdLaugh)
addCommand("tell", cmdTell)
}
func doCommand(cmd string, player Player) error {
words := strings.Fields(cmd)
if len(words) == 0 {
return nil
}
for i := 0; i < len(words) ; i++ {
if f, exists := allCommands[strings.ToLower(words[i])]; exists {
if strings.ToLower(words[i]) == "l" || strings.ToLower(words[i]) == "lo" || strings.ToLower(words[i]) == "loo" || strings.ToLower(words[i]) == "look"{
cmdLook(words[i + 1], player)
i++
} else {
f(cmd, player)
}
}
}
return nil
}
func cmdLaugh(s string, player Player) {
if len(s) > 5 {
log.Println("HAHAHAHAAHA! You laught about", s[5:])
} else {
fmt.Printf("\n")
log.Println("HAHAHAHAAHA! You laught.")
}
}
func cmdTell(s string, player Player) {
if len(s) > 4 {
log.Println("You tell", s[4:])
} else {
fmt.Printf("\n")
log.Println("You try to tell somebody about lsomething")
}
}
func cmdLook(s string, player Player) {
if player.checkexit(string(s[0])) {
look_next_loca := player.Location.Exits[Direction[string(s[0])]].Description
fmt.Printf("\n")
fmt.Printf(look_next_loca)
} else {
fmt.Printf("\n")
fmt.Printf("There is nothing in that direcation.")
}
}
func cmdwhere(s string, player Player) {
fmt.Printf(player.Location.Name)
fmt.Printf("\n")
fmt.Printf(player.Location.Description)
fmt.Printf("\n")
dir_list := []string{}
for d := 0; d < 6; d++ {
if player.Location.Exits[d].To != nil {
dir_list = append(dir_list, ReDirection[d])
}
}
fmt.Printf("[ Exits: %s ]\n", strings.Trim(fmt.Sprint(dir_list), "[]"))
}
func cmdRecall(s string, player Player) {
fmt.Printf("You take out a wishbone and pull apart. You see a light coming to you...\n")
player.recall()
cmdwhere(s, player)
}
func cmdNorth(s string, player Player) {
if player.checkexit("n") {
next_loca := player.Location.Exits[Direction["n"]].To
player = player.updatelocation(next_loca)
cmdwhere(s,player)
} else {
fmt.Printf("You can't go that direction!\n")
}
}
func cmdEast(s string, player Player) {
if player.checkexit("e") {
player = player.updatelocation(player.Location.Exits[Direction["e"]].To)
fmt.Printf("\n")
cmdwhere(s,player)
} else {
fmt.Printf("You can't go that direction!\n")
}
}
func cmdWest(s string, player Player) {
if player.checkexit("w") {
player = player.updatelocation(player.Location.Exits[Direction["w"]].To)
fmt.Printf("\n")
cmdwhere(s,player)
} else {
fmt.Printf("You can't go that direction!\n")
}
}
func cmdSouth(s string, player Player) {
if player.checkexit("s") {
player = player.updatelocation(player.Location.Exits[Direction["s"]].To)
fmt.Printf("\n")
cmdwhere(s,player)
} else {
fmt.Printf("You can't go that direction!\n")
}
}
func cmdUp(s string, player Player) {
if player.checkexit("u") {
player = player.updatelocation(player.Location.Exits[Direction["u"]].To)
fmt.Printf("\n")
cmdwhere(s,player)
} else {
fmt.Printf("You can't go that direction!\n")
}
}
func cmdDown(s string, player Player) {
if player.checkexit("d") {
player = player.updatelocation(player.Location.Exits[Direction["d"]].To)
fmt.Printf("\n")
cmdwhere(s,player)
} else {
fmt.Printf("You can't go that direction!\n")
}
}
// Part 2:
func loadzone (transaction *sql.Tx) (map[int]*Zone, error) {
var id int
//var zone_id int
var name string
//var description string
var allzone = make(map[int]*Zone)
rows, err := transaction.Query(`SELECT id, name FROM zones ORDER BY id`)
if err != nil {
return nil , err
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&id, &name); err != nil {
return nil, err
}
new_zone := Zone{id,name, nil}
new_pointer := &new_zone
allzone[id] = new_pointer
}
return allzone, nil
}
func loadroom (Zone map[int]*Zone ,transaction *sql.Tx) (map[int]*Room, error) {
var room_id int
var room_name string
var room_description string
var allroom = make(map[int]*Room)
var zone_id int
rows, err := transaction.Query(`SELECT id, zone_id, name, description FROM rooms`)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&room_id, &zone_id, &room_name, &room_description); err != nil {
return nil, err
}
zone_pointer := Zone[zone_id]
new_room := Room{room_id, zone_pointer, room_name, room_description, [6]Exit{}}
allroom[room_id] = &new_room
Zone[zone_id].Rooms = []*Room{&new_room}
}
return allroom, nil
}
func loadExit (Room map[int]*Room, transaction *sql.Tx) (map[int]*Room, error) {
var from_room int
var to_room int
var direction string
var description string
rows, err := transaction.Query(`SELECT * FROM exits`)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
if err := rows.Scan(&from_room, &to_room, &direction, &description); err != nil {
return nil, err
}
to_pointer := Room[to_room]
new_exit := Exit{to_pointer, description}
Room[from_room].Exits[Direction[direction]] = new_exit
}
return Room, nil
}
func loadalldata(tx *sql.Tx) error {
ALLzone, err := loadzone(tx)
if err != nil {
return err
}
ALLroom, err := loadroom(ALLzone, tx)
ALLROOM, err = loadExit(ALLroom, tx)
if err != nil {
return err
}
//for key, value := range ALLROOM {
// fmt.Printf("ROOM: ", key, "pointer: ", value)
// fmt.Printf("\n")
//}
return nil
}
func opentransaction(database *sql.DB) error {
tx, err := database.Begin()
if err != nil {
return fmt.Errorf("Starting Transaction: %v", err)
}
err = loadalldata(tx)
if err != nil {
tx.Rollback()
return fmt.Errorf("Loading world data: %v", err)
} else {
if err := tx.Commit(); err != nil {
return fmt.Errorf("Transaction failed while loading world data : %v", err)
}
}
return nil
}
// Player methods:
func initplayer() Player {
player := Player{"Poor", "Guy", ALLROOM[3001]}
return player
}
func (player Player) recall() {
player.Location = ALLROOM[3001]
}
func (player Player) updatelocation(new_room *Room) Player{
player.Location = new_room
return player
}
func (player Player) checkexit(dir string) bool{
num_dir := Direction[dir]
return player.Location.Exits[num_dir].To != nil
}
func main () {
// Part 2:
// the path to the database--this could be an absolute path
path := "world.db"
options :=
"?" + "_busy_timeout=10000" +
"&" + "_foreign_keys=ON" +
"&" + "_journal_mode=WAL" +
"&" + "mode=rw" +
"&" + "_synchronous=NORMAL"
db, err := sql.Open("sqlite3", path+options)
if err != nil {
// handle the error here
fmt.Errorf("Opening Database: %v", err)
}
defer db.Close()
err = opentransaction(db)
if err != nil {
fmt.Errorf("Starting Transaction: %v", err)
}
// Player:
player1 := initplayer()
// Part 1:
log.SetFlags(log.Ltime | log.Lshortfile)
if err := commandLoop(player1); err != nil {
log.Fatalf("%v", err)
}
}