RCRPG/C++11

From Rosetta Code
RCRPG/C++11 is part of RCRPG. You may find other members of RCRPG at Category:RCRPG.
C++11 version of RCRPG. The code can also be checked out and contributed to on github .

Code[edit]

 
//
// main.cpp
// RCRPGCpp
//
// Created by pistacchio on 19/03/14.
//
//
 
#include <algorithm>
#include <iostream>
#include <map>
#include <set>
#include <string>
#include <random>
#include <regex>
#include <vector>
 
// Initialize the randomization engine
std::default_random_engine rnd_eng(std::random_device{}());
 
//////////////////
// String utils //
//////////////////
 
// Concats string in a nice readable format adding "," and "and"
std::string descriptive_join(const std::vector<std::string>& items) {
std::string desc;
std::vector<std::string> itms {items.begin(), items.end()};
int items_size {(int)items.size()};
 
if (items_size > 1) {
for (int i {0}; i < items_size - 1; i++) {
itms.insert(itms.begin() + i * 2 + 1, i == items_size -2 ? " and " : ", ");
}
}
 
std::for_each(itms.begin(), itms.end(), [&](std::string s) {
desc += s;
});
 
return desc;
}
 
//////////
// Item //
//////////
 
enum Item {LADDER, SLEDGE, GOLD};
static const std::map<Item, std::string> Item_strings {
{LADDER, "a ladder"},
{SLEDGE, "a sledge"},
{GOLD, "some gold"}
};
static const std::map<std::string, Item> String_items {
{"ladder", LADDER},
{"sledge", SLEDGE},
{"gold", GOLD}
};
 
/////////////
// Aliases //
/////////////
 
std::map<std::string, std::string> Aliases {
{"i", "inventory"},
{"n", "north"},
{"e", "east"},
{"w", "west"},
{"s", "south"},
{"get", "take"},
{"u", "up"},
{"l", "look"},
{"d", "down"}
};
std::string unalias(std::string term) {
if (Aliases.find(term) == Aliases.end()) {
return term;
} else {
return Aliases.find(term)->second;
}
}
void list_aliases() {
std::cout << "Current aliases are:" << std::endl;
for_each(Aliases.begin(), Aliases.end(), [](std::pair<std::string, std::string> alias){
std::cout << alias.first << " -> " << alias.second << std::endl;
});
}
void add_alias(std::string alias, std::string command) {
if (Aliases.find(alias) == Aliases.end()) {
Aliases[alias] = command;
}
 
}
 
//////////////
// Location //
//////////////
 
struct Location {
int x;
int y;
int z;
 
Location (int xval, int yval, int zval): x(xval), y(yval), z(zval) {}
 
Location& operator+= (Location const& other) {
*this = *this + other;
return *this;
}
Location operator+ (const Location& other) {
return Location(this->x + other.x, this->y + other.y, this->z + other.z);
}
};
bool operator< (const Location& left, const Location& right) {
return std::to_string(left.x) + '-' + std::to_string(left.y) + '-' + std::to_string(left.z) <
std::to_string(right.x) + '-' + std::to_string(right.y) + '-' + std::to_string(right.z);
}
 
///////////////
// Direction //
///////////////
 
static const std::map<std::string, Location> Direction {
{"north", Location( 0, -1, 0)},
{"south", Location( 0, 1, 0)},
{"east", Location(-1, 0, 0)},
{"west", Location( 1, 0, 0)},
{"up", Location( 0, 0, -1)},
{"down", Location( 0, 0, 1)}
};
 
//////////////////////////////
// Interface Item Container //
//////////////////////////////
 
// Inherited by Player and Room, both need a way to contain items
class IItemContainer {
public:
bool has_item(const Item item) const {
return items.find(item) != items.end();
}
bool add_item(Item item) {
if (items.find(item) == items.end()) {
items.insert(item);
return true;
} else {
return false;
}
}
std::set<Item> add_all_items(std::set<Item> new_items) {
items.insert(new_items.begin(), new_items.end());
return items;
}
bool remove_item(Item item) {
if (items.find(item) == items.end()) {
return false;
} else {
items.erase(item);
return true;
}
}
std::set<Item> remove_all_items() {
std::set<Item> removed_items {items.begin(), items.end()};
items = std::set<Item> {};
return removed_items;
}
protected:
std::set<Item> items;
};
 
 
//////////
// Room //
//////////
 
class Room : public IItemContainer {
public:
Room () = default;
Room (std::string description): description(description) {
std::uniform_int_distribution<int> gen(0, 2);
 
if (gen(rnd_eng) == 0) {
items.insert(LADDER);
}
if (gen(rnd_eng) == 0) {
items.insert(SLEDGE);
}
if (gen(rnd_eng) == 0) {
items.insert(GOLD);
}
}
const std::string describe (std::vector<std::string> adjacent_directions) const {
std::string items_on_floor;
std::string exits;
 
if (items.size() > 0) {
items_on_floor = "\nOn the floor you can see " + describe_items();
}
 
if (adjacent_directions.size() == 1) {
exits = "There is one exit: " + adjacent_directions.front();
} else if (adjacent_directions.size() > 1) {
exits = "\nYou can see the following directions: ";
 
exits += descriptive_join(adjacent_directions) + ".";
}
 
return description + items_on_floor + exits + "\n";
}
private:
std::string description;
std::string describe_items () const {
std::vector<std::string> itms;
std::for_each(items.begin(), items.end(), [&](Item i) {
itms.push_back(Item_strings.find(i)->second);
});
 
return descriptive_join(itms) + ".";
}
};
 
 
///////////
// World //
///////////
 
class World {
public:
World () {
rooms[Location(0, 0, 0)] = Room{"The room where it all started..."};
rooms[Location(1, 1, 5)] = Room{"You found it! Lots of gold!"};
}
bool room_exists (const Location room) const {
return rooms.find(room) != rooms.end();
}
Room& room_at (const Location location) {
return rooms[location];
}
const void dig (Location location) {
rooms[location] = Room{};
}
const std::vector<std::string> adjacent_directions (Location location) {
std::vector<std::string> result {};
 
std::for_each(Direction.begin(), Direction.end(), [&](std::pair<std::string, Location> direction) {
if (room_exists(location + direction.second)) {
result.push_back(direction.first);
}
});
 
return result;
}
private:
std::map<Location, Room> rooms;
};
 
////////////
// Player //
////////////
 
class Player : public IItemContainer {
public:
Player () : current_location(0, 0, 0) {
items.insert(SLEDGE);
};
const Location goto_direction (const Location direction) {
current_location += direction;
return current_location;
}
Location get_current_location () const {
return current_location;
}
std::string inventory () {
if (items.size() == 0) {
return "You are not carrying anything";
} else {
std::vector<std::string> itemsv;
std::for_each(items.begin(), items.end(), [&](Item i) {
itemsv.push_back(Item_strings.find(i)->second);
});
return "You are carrying: " + descriptive_join(itemsv);
}
}
bool equip(Item item) {
if (has_item(item)) {
equipping = true;
equipped = item;
return true;
} else {
return false;
}
}
bool unequip(Item item) {
if (equipped == item) {
equipping = false;
return true;
} else {
return false;
}
}
bool is_equipping(Item item) {
return equipping == true && equipped == item;
}
private:
Location current_location;
bool equipping {false};
Item equipped;
};
 
 
//////////
// Game //
//////////
 
class Game {
public:
void execute(const std::string command) {
std::vector<std::string> cmd;
 
std::for_each(std::sregex_token_iterator {command.begin(), command.end(), std::regex {"\\s+"}, -1},
std::sregex_token_iterator {},
[&](std::ssub_match sm) {
cmd.push_back(sm.str());
});
 
std::string action {unalias(cmd.front())};
 
// HELP
if (action == "help") {
print_help();
 
// MOVE (Up, Down, North etc)
} else if (Direction.find(action) != Direction.end()) {
Location direction {Direction.find(action)->second};
Location location {direction + player.get_current_location()};
 
if (world.room_exists(location)) {
Room& room {world.room_at(location)};
if (action == "up" && !room.has_item(LADDER)) {
std::cout << "You can't go upwards without a ladder!" << std::endl;
} else {
Location current_location = player.goto_direction(direction);
std::cout << world.room_at(current_location).describe(world.adjacent_directions(current_location));
}
} else {
std::cout << "There's no exit in that direction!" << std::endl;
}
 
// LOOK and describe the room
} else if (action == "look") {
std::cout << world.room_at(player.get_current_location()).describe(world.adjacent_directions(player.get_current_location()));
 
// DIG towards a direction
} else if (action == "dig") {
if (cmd.size() != 2) {
std::cout << "Where do you want to dig?" << std::endl;
} else if (!player.is_equipping(SLEDGE)) {
std::cout << "With your bare hands?!" << std::endl;
} else {
if (Direction.find(cmd[1]) == Direction.end()) {
std::cout << "That is not a direction I recognize" << std::endl;
} else {
Location new_loc = player.get_current_location() + Direction.find(cmd[1])->second;
if (world.room_exists(new_loc)) {
std::cout << "There is already an exit, there!" << std::endl;
} else {
world.dig(player.get_current_location() + Direction.find(cmd[1])->second);
std::cout << "There is now a new exit " << cmd[1] << "ward" << std::endl;
}
}
}
 
// DROP an item or all in the inventory
} else if (action == "drop") {
if (cmd.size() == 1) {
std::cout << "Drop what?" << std::endl;
} else {
if (cmd[1] == "all" ) {
Room& room {world.room_at(player.get_current_location())};
room.add_all_items(player.remove_all_items());
std::cout << "All items dropped;" << std::endl;
} else if (String_items.find(cmd[1]) == String_items.end()) {
std::cout << "\"" << cmd[1] <<"\" is not something I recognize" << std::endl;
} else {
Item item {String_items.find(cmd[1])->second};
if (player.remove_item(item)) {
Room& room {world.room_at(player.get_current_location())};
room.add_item(item);
std::cout << "Item dropped" << std::endl;
} else {
std::cout << "You don't have any" << cmd[1] << std::endl;
}
}
}
 
// TAKE an item from the room or all of them
} else if (action == "take" ) {
if (cmd.size() == 1) {
std::cout << "Take what?" << std::endl;
} else {
if (cmd[1] == "all") {
Room& room {world.room_at(player.get_current_location())};
player.add_all_items(room.remove_all_items());
std::cout << "All items taken;" << std::endl;
} else if (String_items.find(cmd[1]) == String_items.end()) {
std::cout << "\"" << cmd[1] <<"\" is not something I recognize" << std::endl;
} else {
Item item {String_items.find(cmd[1])->second};
Room& room {world.room_at(player.get_current_location())};
if (room.remove_item(item)) {
player.add_item(item);
std::cout << "Item taken" << std::endl;
} else {
std::cout << "There is no such item in the room" << std::endl;
}
}
}
 
// INVENTORY listing
} else if (action == "inventory") {
std::cout << player.inventory() << std::endl;
 
// EQUIP an item currently in the inventory
} else if (action == "equip") {
if (cmd.size() == 1) {
std::cout << "What do you want to equip?" << std::endl;
} else {
if (String_items.find(cmd[1]) == String_items.end()) {
std::cout << "That is not an item I recognize" << std::endl;
} else {
if (player.equip(String_items.find(cmd[1])->second)) {
std::cout << "Item equipped!" << std::endl;
} else {
std::cout << "You don't have it" << std::endl;
}
}
}
 
// UNEQUIP an item currently equipped
} else if (action == "unequip") {
if (cmd.size() == 1) {
std::cout << "What do you want to unequip?" << std::endl;
} else {
if (String_items.find(cmd[1]) == String_items.end()) {
std::cout << "That is not an item I recognize" << std::endl;
} else {
if (player.equip(String_items.find(cmd[1])->second)) {
std::cout << "Item unequipped!" << std::endl;
} else {
std::cout << "You don't have it" << std::endl;
}
}
}
 
// ALIAS a command, or list the aliases
} else if (action == "alias") {
if (cmd.size() == 1) {
list_aliases();
} else if (cmd.size() == 3) {
add_alias(cmd[1], cmd[2]);
std::cout << "Alias added" << std::endl;
} else {
std::cout << "The correct use is: alias <ALIAS> <COMMAND>" << std::endl;
}
 
// WHAT?! A command that is not undertood by this simplistic parser
} else {
std::cout << "Hm?! What do you mean?" << std::endl;
}
}
void print_help() {
std::cout << "You need a sledge to dig rooms and ladders to go upwards." << std::endl
<< "Valid commands are: directions (north, south...), dig, take, drop, equip, inventory and look." << std::endl
<< "Additionally you can tag rooms with the 'name' command and alias commands with 'alias'." << std::endl
<< "Have fun!" << std::endl;
}
private:
World world;
Player player;
};
 
 
////////////////
// Main cycle //
////////////////
 
int main()
{
Game game;
std::string input_line;
 
std::cout << "Welcome to the dungeon!" << std::endl
<< "Grab the sledge and make your way to room 1,1,5 for a non-existant prize!" << std::endl << std::endl;
game.print_help();
 
while (input_line != "exit") {
std::getline(std::cin, input_line);
 
game.execute(input_line);
}
 
std::cout << "See you next time!" << std::endl;
 
return 0;
}