RCRPG/Go
< RCRPG
<lang go>package main
import (
"container/vector" "fmt" "io" "os" "rand" "sort" "strings"
)
const (
VERSION_MAJOR = 1 VERSION_MINOR = 0
)
type Direction int
const (
NORTH = Direction(iota) SOUTH EAST WEST UP DOWN NUM_DIRECTIONS = iota
)
func (d Direction) Opposite() Direction {
return d ^ 1
}
func (d Direction) String() string {
switch d {
case NORTH: return "north"
case SOUTH: return "south"
case EAST: return "east"
case WEST: return "west"
case UP: return "up"
case DOWN: return "down"
}
panic("Invalid direction!")
}
type Item int
const (
NIL_ITEM = Item(iota) GOLD LADDER SLEDGE NUM_ITEMS = iota
)
func (item Item) String() string {
switch item {
case GOLD: return "Gold coin"
case LADDER: return "Ladder"
case SLEDGE: return "Sledge hammer"
}
panic("Invalid item!")
}
type Room struct {
X,Y,Z int Name string Passages [6]*Room Items map[Item] int
}
// Creates a new room func GenerateRoom(X,Y,Z int) *Room {
room := new(Room)
room.X,room.Y,room.Z = X,Y,Z
room.Name = ""
room.Items = make(map[Item] int)
switch item := Item(rand.Intn(4)); item {
case GOLD, LADDER, SLEDGE:
room.Items[item]++
}
return room
}
// Connects this room to another func (room *Room) Connect(dir Direction, other *Room) {
room.Passages[dir] = other other.Passages[dir.Opposite()] = room
}
// The room name func (room *Room) String() string {
if len(room.Name) == 0 {
return fmt.Sprintf("Room %d,%d,%d", room.X, room.Y, room.Z)
}
return room.Name
}
// Counts the number of items are laying in this room func (room *Room) NumItems() int {
total := 0
for _, count := range room.Items {
total += count
}
return total
}
// Counts the number of exits out of this room func (room *Room) NumExits() int {
total := 0
for _, other := range room.Passages {
if other != nil {
total++
}
}
return total
}
// Prints a description of the current room func (room *Room) Describe() {
fmt.Printf("You are at %s\n", room)
if room.NumItems() > 0 {
fmt.Print("On the ground you can see: ")
first := true
for item := NIL_ITEM; item < NUM_ITEMS; item++ {
count := room.Items[item]
if count <= 0 { continue }
if !first { fmt.Print(", ") }
first = false
if count == 1 {
fmt.Printf("a %s", item)
} else {
fmt.Printf("%d %ss", count, item)
}
}
fmt.Println()
}
if room.NumExits() == 0 {
fmt.Print("There are no exits.\n")
} else {
fmt.Print("Exits are:\n")
for dir := Direction(0); dir < NUM_DIRECTIONS; dir++ {
other := room.Passages[dir]
if other != nil {
fmt.Printf(" %s: %s\n", dir, other)
}
}
}
}
type Game struct {
// Three level mapping of the rooms Rooms map[int] map[int] map[int] *Room // Number of items of each type Inventory map[Item] int // Currently equipped item Equipped Item // Current room Room *Room // All commands Commands map[string] func(args []string) // All aliases Aliases map[string] []string // Help texts HelpText map[string] string
}
// Counts the number of items you have in your inventory func (g *Game) NumItems() int {
total := 0
for _, count := range g.Inventory {
total += count
}
return total
}
// Creates or returns the room at specified coordinates. func (g *Game) GetRoomAt(X,Y,Z int) *Room {
if g.Rooms == nil {
g.Rooms = make(map[int] map[int] map[int] *Room)
}
if g.Rooms[X] == nil {
g.Rooms[X] = make(map[int] map[int] *Room)
}
if g.Rooms[X][Y] == nil {
g.Rooms[X][Y] = make(map[int] *Room)
}
room := g.Rooms[X][Y][Z]
if room == nil {
room = GenerateRoom(X,Y,Z)
g.Rooms[X][Y][Z] = room
}
return room
}
// north, south, east, west, up, down: Moves around func (g *Game) Move(args []string) {
if len(args) != 1 {
fmt.Print("Invalid number of arguments\n")
return
}
var dir Direction
switch strings.ToLower(args[0]) {
default:
fmt.Printf("Invalid direction: %q\n", args[0])
return
case "north": dir = NORTH
case "south": dir = SOUTH
case "east": dir = EAST
case "west": dir = WEST
case "up": dir = UP
case "down": dir = DOWN
}
other := g.Room.Passages[dir]
if other == nil {
fmt.Printf("You can't move %s. There is a wall in the way.\n", dir)
} else if dir == UP && g.Room.Items[LADDER] == 0 {
fmt.Printf("You can't move %s. There are no %s.\n", dir, LADDER)
} else {
g.Room = other
other.Describe()
}
}
// attack: Breaks a wall. func (g *Game) Sledge(args []string) {
if len(args) != 1 {
fmt.Print("Invalid number of arguments\n")
return
}
if g.Equipped != SLEDGE {
fmt.Printf("You need a %s equipped to break the wall.\n", SLEDGE)
return
}
X,Y,Z := g.Room.X,g.Room.Y,g.Room.Z
var dir Direction
switch strings.ToLower(args[0]) {
default:
fmt.Printf("Invalid direction: %q\n", args[0])
return
case "north": dir = NORTH; Y--
case "south": dir = SOUTH; Y++
case "east": dir = EAST; X++
case "west": dir = WEST; X--
case "up": dir = UP; Z++
case "down": dir = DOWN; Z--
}
other := g.Room.Passages[dir]
if other != nil {
fmt.Print("There is already a passage there.\n")
return
}
other = g.GetRoomAt(X,Y,Z)
g.Room.Connect(dir,other)
fmt.Printf("Made a passage %s to %s\n", dir, other)
}
// drop: Puts items down func (g *Game) DropItem(args []string) {
if len(args) != 1 {
fmt.Print("Invalid number of arguments\n")
return
}
var item Item
switch strings.ToLower(args[0]) {
default:
fmt.Printf("You don't have any %q.\n", args[0])
return
case "all":
if g.NumItems() == 0 {
fmt.Print("You don't have any items.\n")
return
}
fmt.Print("You drop: ")
first := true
for item := NIL_ITEM; item < NUM_ITEMS; item++ {
count := g.Inventory[item]
if count <= 0 { continue }
if !first { fmt.Print(", ") }
first = false
if count == 1 {
fmt.Printf("a %s", item)
} else {
fmt.Printf("%d %ss", count, item)
}
g.Inventory[item] = 0
g.Room.Items[item] += count
}
fmt.Println()
return
case "gold": item = GOLD
case "ladder": item = LADDER
case "sledge": item = SLEDGE
}
total := g.Inventory[item]
if total == 0 {
fmt.Printf("You don't have any %ss.\n", item)
return
}
g.Inventory[item]--
g.Room.Items[item]++
fmt.Printf("You drop a %s.\n", item)
}
// take: Picks up items func (g *Game) TakeItem(args []string) {
if len(args) != 1 {
fmt.Print("Invalid number of arguments\n")
return
}
var item Item
switch strings.ToLower(args[0]) {
default:
fmt.Printf("You don't see any %q.\n", args[0])
return
case "all":
if g.Room.NumItems() == 0 {
fmt.Print("You don't see any items.\n")
return
}
fmt.Print("You take: ")
first := true
for item := NIL_ITEM; item < NUM_ITEMS; item++ {
count := g.Room.Items[item]
if count <= 0 { continue }
if !first { fmt.Print(", ") }
first = false
if count == 1 {
fmt.Printf("a %s", item)
} else {
fmt.Printf("%d %ss", count, item)
}
g.Room.Items[item] = 0
g.Inventory[item] += count
}
fmt.Println()
return
case "gold": item = GOLD
case "ladder": item = LADDER
case "sledge": item = SLEDGE
}
total := g.Room.Items[item]
if total == 0 {
fmt.Printf("You don't see any %ss.\n", item)
return
}
g.Room.Items[item]--
g.Inventory[item]++
fmt.Printf("You take a %s.\n", item)
}
// inventory: Shows what you are carrying func (g *Game) ShowInventory(args []string) {
if len(args) != 0 {
fmt.Print("Invalid number of arguments\n")
return
}
if g.Equipped != NIL_ITEM {
fmt.Printf("You have a %s equipped.\n", g.Equipped)
}
if g.NumItems() == 0 {
fmt.Print("You are not carrying anything.\n")
return
}
fmt.Print("You are carrying: ")
first := true
for item := NIL_ITEM; item < NUM_ITEMS; item++ {
count := g.Inventory[item]
if count <= 0 { continue }
if !first { fmt.Print(", ") }
first = false
if count == 1 {
fmt.Printf("a %s", item)
} else {
fmt.Printf("%d %ss", count, item)
}
}
fmt.Println()
}
// name: Renames the current room func (g *Game) RenameRoom(args []string) {
if len(args) != 1 {
fmt.Print("Invalid number of arguments\n")
return
}
g.Room.Name = args[0]
fmt.Printf("This room is now called %q\n", args[0])
g.Room.Describe()
}
// equip: Equips an item func (g *Game) EquipItem(args []string) {
if len(args) != 1 {
fmt.Print("Invalid number of arguments\n")
return
}
var item Item
switch strings.ToLower(args[0]) {
default:
fmt.Printf("You don't have any %q.\n", args[0])
return
case "gold": item = GOLD
case "ladder": item = LADDER
case "sledge": item = SLEDGE
}
count := g.Inventory[item]
if count <= 0 {
fmt.Printf("You don't have any %ss.\n", item)
return
} else if item == g.Equipped {
fmt.Printf("You already have a %s equipped.\n", item)
return
}
if g.Equipped != NIL_ITEM {
fmt.Printf("You unequip the %s. ", g.Equipped)
g.Inventory[g.Equipped]++
}
fmt.Printf("You equip a %s.\n", item)
g.Inventory[item]--
g.Equipped = item
}
// alias: Creats an alias func (g *Game) CreateAlias(args []string) {
if len(args) < 1 {
fmt.Print("Invalid number of arguments\n")
return
}
name := strings.ToLower(args[0])
switch name {
case "north","south","east","west","up","down","attack","drop","take","inventory","name","equip","alias":
fmt.Printf("Can't overwrite the %q command.\n", name)
return
}
if len(args) == 1 {
g.Commands[name] = nil
fmt.Printf("Removed the %q alias.\n", name)
return
}
g.Aliases[name] = args[1:]
fmt.Printf("Created the %q alias.\n", name)
}
// help: Shows information about commands func (g *Game) Help(args []string) {
if len(args) == 0 {
fmt.Print("Commands:\n")
for _, cmd := range g.GetCommands() {
fmt.Printf(" %s\n", cmd)
}
} else if len(args) == 1 {
name := args[0]
arr, ok := g.Aliases[name]
if ok {
fmt.Printf("Alias for: %q\n", strings.Join(arr," "))
return
}
_, ok = g.Commands[name]
if ok {
fmt.Printf("Command: %s\n", name)
descr, ok := g.HelpText[name]
if ok {
fmt.Printf(" %s\n", descr)
}
return
}
fmt.Printf("Unknown command: %q\n", name)
} else if len(args) > 1 {
fmt.Print("Invalid number of arguments\n")
}
}
// look: Looks around func (g *Game) Look(args []string) {
if len(args) != 0 {
fmt.Print("Invalid number of arguments\n")
return
}
g.Room.Describe()
}
// quit: Ends the game. The End. Final. func (g *Game) Quit(args []string) {
if len(args) != 0 {
fmt.Print("Invalid number of arguments\n")
return
}
os.Exit(0)
}
// Resolves aliases and dispatches to the correct handler func (g *Game) Dispatch(args []string) {
argv := vector.StringVector(args)
seen := make(map[string]bool)
name := argv.At(0)
seen[name] = true
prefix, ok := g.Aliases[name]
for ok {
argv.Cut(0,1)
prefixv := vector.StringVector(prefix)
argv.InsertVector(0,&prefixv)
name = argv.At(0)
if seen[name] {
fmt.Print("Recursive alias.\n")
return
}
seen[name] = true
prefix, ok = g.Aliases[name]
}
cb := g.Commands[name]
if cb == nil {
fmt.Printf("Invalid command: %q\n", name)
return
}
cb(argv.Data()[1:])
return
}
// Set everything up func (g *Game) Initialize() *Game {
startRoom := g.GetRoomAt(0,0,0)
startRoom.Name = "Start room"
startRoom.Items[SLEDGE] = 1
goalRoom := g.GetRoomAt(1,1,5)
goalRoom.Name = "Prize room"
g.Room = startRoom
g.Inventory = make(map[Item] int)
g.Commands = map[string] func(args []string) {
"move": func(args []string) { g.Move(args) },
"attack": func(args []string) { g.Sledge(args) },
"drop": func(args []string) { g.DropItem(args) },
"take": func(args []string) { g.TakeItem(args) },
"inventory": func(args []string) { g.ShowInventory(args) },
"name": func(args []string) { g.RenameRoom(args) },
"equip": func(args []string) { g.EquipItem(args) },
"alias": func(args []string) { g.CreateAlias(args) },
"quit": func(args []string) { g.Quit(args) },
"look": func(args []string) { g.Look(args) },
"help": func(args []string) { g.Help(args) },
}
g.Aliases = map[string] []string {
"north": []string{"move","north"},
"south": []string{"move","south"},
"east": []string{"move","east"},
"west": []string{"move","west"},
"up": []string{"move","up"},
"down": []string{"move","down"},
"n": []string{"north"},
"s": []string{"south"},
"e": []string{"east"},
"w": []string{"west"},
"u": []string{"up"},
"d": []string{"down"},
"i": []string{"inventory"},
"inv": []string{"inventory"},
"a": []string{"attack"},
}
g.HelpText = map[string] string {
"move": "Moves you trough passages.",
"attack": "Attacks a wall with the equipped Sledge hammer.",
"drop": "Drops items.",
"take": "Picks up items.",
"inventory": "Shows your inventory.",
"name": "Rename a room.",
"equip": "Equip an item.",
"alias": "Creates an alias.",
"quit": "Exits the game.",
"look": "Describes the room.",
"help": "Help about commands.",
}
return g
}
// Read a single line of input func readLine(in io.Reader) (string, bool) {
line := new(vector.StringVector)
buf := []byte{0}
_, err := in.Read(buf)
for err == nil && buf[0] != '\n' && buf[0] != '\r' {
line.Push(string(buf))
_, err = in.Read(buf)
}
if buf[0] == '\r' {
in.Read(buf)
}
return strings.Join(line.Data(), ""), err == nil
}
// Returns a sorted array of command and alias names func (g *Game) GetCommands() []string {
commandNames := new(vector.StringVector)
for name := range g.Commands {
commandNames.Push(name)
}
for name := range g.Aliases {
commandNames.Push(name)
}
sort.Sort(commandNames)
return commandNames.Data()
}
// Main game loop func (g *Game) Run() {
fmt.Printf("Welcome to RC Minimalist RPG, Go version %d.%d.\n", VERSION_MAJOR, VERSION_MINOR)
fmt.Print("You start in room 0,0,0. Your goal is at 1,1,5. Good luck!\n")
fmt.Printf("Commands: %s\n", strings.Join(g.GetCommands(), ", "))
g.Room.Describe()
fmt.Print("\n> ")
line, ok := readLine(os.Stdin)
for ok && len(line) == 0 {
fmt.Print("\n> ")
line, ok = readLine(os.Stdin)
}
for ok {
tokens := strings.Split(line, " ", 0)
g.Dispatch(tokens)
fmt.Print("\n> ")
line, ok = readLine(os.Stdin)
for ok && len(line) == 0 {
fmt.Print("\n> ")
line, ok = readLine(os.Stdin)
}
}
}
func main() {
g := new(Game).Initialize() g.Run()
}</lang>