added: input and its subclasses

src/file_input.cc

@@ -0,0 +1,42 @@
+#include "file_input.h"
+#include <utility>
+#include <string>
+
+file_input::file_input(std::ifstream &&ifs):
+        in{std::move(ifs)} {}
+
+inline game_command get_direction(std::string &str, const char *COMMANDS[],
+                                  const int COMMANDS_CNT) {
+        for (int i = 0; i < COMMANDS_CNT; ++i)
+                if (str == COMMANDS[i] &&
+                    i >= game_command::move_north &&
+                    i <= game_command::move_southeast)
+                        return (game_command)i;
+
+        return game_command_panic;
+}
+
+game_command file_input::get_command() {
+        const char *COMMANDS[] = {
+                "q", "no", "so", "ea", "we", "ne", "nw", "se", "sw", "u", "a"
+        };
+        const int COMMANDS_CNT = 11;
+        std::string cmd;
+        in >> cmd;
+        game_command tmp;
+
+        if (cmd == "q")
+                return game_command_terminate;
+        else if (cmd == "u")
+                return (game_command)((tmp = get_direction(cmd, COMMANDS,
+                                             COMMANDS_CNT)) == game_command_panic
+                                      ? tmp : tmp - move_north + apply_north);
+        else if (cmd == "a")
+                return (game_command)((tmp = get_direction(cmd, COMMANDS,
+                                             COMMANDS_CNT)) == game_command_panic
+                                      ? tmp : tmp - move_north + attack_north);
+        else // is just moving
+                return get_direction(cmd, COMMANDS, COMMANDS_CNT);
+
+        return game_command_pass;
+}