Added two player version for lua

.github/workflows/lua.yaml

@@ -0,0 +1,34 @@
+# This workflow will run the tests on the lua version of tictactoe
+
+name: lua
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./tictactoe_lua
+    steps:
+    - name: Checkout repo
+      uses: actions/checkout@v3
+    - uses: actions/checkout@v3
+      with:
+        repository: bluebird75/luaunit
+        path: luaunit
+        clean: false
+        sparse-checkout: |
+          luaunit.lua
+        sparse-checkout-cone-mode: false
+    - uses: leafo/gh-actions-lua@v10
+      with:
+        luaVersion: "5.4"
+    - name: Test
+      run: |
+        mv ../luaunit/luaunit.lua .
+        lua tests/test_tictactoe.lua

.gitignore

@@ -182,6 +182,7 @@ tictactoe_ruby/*.gem
 *.class
 
 /fibonacci
+luaunit.lua
 
 tictactoe_java/*.jar
 

tictactoe_lua/main.lua

@@ -0,0 +1,3 @@
+require("tictactoe_lua")
+
+TicTacToe.play()

tictactoe_lua/tests/test_tictactoe.lua

@@ -0,0 +1,61 @@
+package.path = package.path .. ";../?.lua"
+require("tictactoe_lua")
+
+Lu = require('luaunit')
+
+TestGeneral = {}
+
+function TestGeneral:setUp()
+    TicTacToe.board = { "1", "2", "3", "4", "5", "6", "7", "8", "9" }
+end
+
+function TestGeneral:test_swap_player()
+    Lu.assertEquals(TicTacToe.swap_player("X"), "O")
+    Lu.assertEquals(TicTacToe.swap_player("O"), "X")
+end
+
+function TestGeneral:test_is_board_filled()
+    Lu.assertFalse(TicTacToe.is_board_filled())
+    TicTacToe.board = { "X", "X", "X", "O", "O", "O", "O", "X", "X" }
+    Lu.assertTrue(TicTacToe.is_board_filled())
+end
+
+function TestGeneral:test_check_win_condition()
+    TicTacToe.board = { "X", "X", "3", "4", "5", "6", "7", "8", "X" }
+    Lu.assertEquals(TicTacToe.check_win_condition({ 1, 2, 3 }, "X"), { spots_open = { 3 }, spots_done = 2 })
+    Lu.assertEquals(TicTacToe.check_win_condition({ 1, 2, 9 }, "X"), { spots_open = {}, spots_done = 3 })
+    Lu.assertEquals(TicTacToe.check_win_condition({ 1, 2, 9 }, "O"), { spots_open = {}, spots_done = 0 })
+end
+
+function TestGeneral:Test_isplayer_win_row()
+    TicTacToe.board = {"X", "X", "X", "4", "5", "6", "7", "8", "X"}
+    Lu.assertFalse(TicTacToe.is_player_win("O"))
+    Lu.assertTrue(TicTacToe.is_player_win("X"))
+end
+
+function TestGeneral:Test_isplayer_win_col()
+    TicTacToe.board = {"1", "O", "X", "4", "O", "6", "7", "O", "X"}
+    Lu.assertFalse(TicTacToe.is_player_win("X"))
+    Lu.assertTrue(TicTacToe.is_player_win("O"))
+end
+
+function TestGeneral:Test_isplayer_win_diag()
+    TicTacToe.board = {"1", "2", "X", "4", "X", "6", "X", "O", "O"}
+    Lu.assertFalse(TicTacToe.is_player_win("O"))
+    Lu.assertTrue(TicTacToe.is_player_win("X"))
+end
+
+function TestGeneral:test_fix_spot()
+    TicTacToe.board = {"1", "2", "X", "4", "X", "6", "X", "O", "O"}
+    Lu.assertTrue(TicTacToe.fix_spot(1, "X"))
+    -- Now occupied
+    Lu.assertFalse(TicTacToe.fix_spot(1, "X"))
+    --  Too small
+    Lu.assertFalse(TicTacToe.fix_spot(-3, "O"))
+    --  Too big
+    Lu.assertFalse(TicTacToe.fix_spot(13, "O"))
+end
+
+
+
+os.exit(Lu.LuaUnit.run())

tictactoe_lua/tictactoe_lua.lua

@@ -0,0 +1,112 @@
+TicTacToe = {
+    board = { "1", "2", "3", "4", "5", "6", "7", "8", "9" },
+    win_conditions = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 }, -- Rows
+        { 1, 4, 7 }, { 2, 5, 8 }, { 3, 5, 9 },                -- Cols
+        { 1, 5, 9 }, { 3, 5, 7 }                              -- Diags
+    },
+    player_markers = { X = true, O = true },
+    ai_opponent = false,
+    ai_marker = "X",
+    ai_strength = 0,
+}
+
+function TicTacToe.swap_player(current_player)
+    if current_player == "X" then
+        return "O"
+    end
+    return "X"
+end
+
+function TicTacToe.show_board()
+    local line_separator = "---------------"
+    local side_length = 3
+    print(line_separator)
+    for row = 1, side_length do
+        for col = 1, side_length do
+            io.write("| " .. TicTacToe.board[(row - 1) * side_length + col] .. " |")
+        end
+        print ""
+        print(line_separator)
+    end
+end
+
+function TicTacToe.is_board_filled()
+    for _, value in ipairs(TicTacToe.board) do
+        if TicTacToe.player_markers[value] == nil then
+            return false
+        end
+    end
+    return true
+end
+
+function TicTacToe.check_win_condition(win_condition, current_player)
+    local result = { spots_open = {}, spots_done = 0 }
+    for _, spot in ipairs(win_condition) do
+        if TicTacToe.board[spot] == current_player then
+            result.spots_done = result.spots_done + 1
+            -- If it is not the current player and it is not the other one
+            -- Then it is open
+        elseif TicTacToe.board[spot] ~= TicTacToe.swap_player(current_player) then
+            table.insert(result.spots_open, spot)
+        end
+    end
+    return result
+end
+
+function TicTacToe.is_player_win(current_player)
+    for _, win_condition in pairs(TicTacToe.win_conditions) do
+        local result = TicTacToe.check_win_condition(win_condition, current_player)
+        if result.spots_done == 3 then
+            return true
+        end
+    end
+    return false
+end
+
+function TicTacToe.fix_spot(spot, current_player)
+    if TicTacToe.board[spot] == nil then
+        print("ERROR: Spot has to be in range [1-9]!")
+        return false
+    end
+    if TicTacToe.player_markers[TicTacToe.board[spot]] ~= nil then
+        print("ERROR: Spot " .. spot .. " is already occupied!")
+        return false
+    end
+    TicTacToe.board[spot] = current_player
+    return true
+end
+
+function TicTacToe.player_turn(current_player)
+    while true do
+        print("Player " .. current_player .. " turn.")
+        TicTacToe.show_board()
+        local result = io.read("n")
+        if result == nil then
+            print("ERROR: Input must be a valid integer!")
+            io.read("l")
+            goto continue
+        end
+        if TicTacToe.fix_spot(result, current_player) then
+            break
+        end
+        ::continue::
+    end
+end
+
+function TicTacToe.play()
+    local player = "X"
+
+    while true do
+        TicTacToe.player_turn(player)
+        if TicTacToe.is_player_win(player) then
+            print("Player " .. player .. " wins the game!")
+            break
+        end
+        if TicTacToe.is_board_filled() then
+            print("Draw!")
+            break
+        end
+        player = TicTacToe.swap_player(player)
+    end
+    TicTacToe.show_board()
+end