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                <h2 class="news_item_title">
                    <a href="memory-logic.html">"Memory" game logic</a>
                </h2>
                <p class="news_item_date">
                    2024-05-03 00:00
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<h1 id="memorygamelogic">"Memory" game logic</h1>
<p>In April I implemented "Memory" game logic in Python as limited language model and successfully converted the code to C++ by the instrument under development.</p>
<p>Limited language model assumes the following architecture of two parts:</p>
<ol>
<li>state context</li>
<li>pure functions without side effects working only with the context</li>
</ol>
<p>Game logic state context in Python currently looks like this (<a href="https://git.opengamestudio.org/kornerr/research-portable-memory/src/commit/6fcd542daa6242c8c23dddb88d04cda74a730328/v3/memory_Context.h">C++</a>):</p>
<pre><code class="python language-python">class memory_Context:
  def __init__(self):
    self.hiddenItems = []
    self.mismatchedItems = []
    self.playfieldItems = {}
    self.playfieldSize = 0
    self.recentField = "none"
    self.selectedId = -1
    self.selectedItems = []
    self.victory = False
</code></pre>
<p>Since the instrument only works with functions at the moment, I had to write C++ context code manually.</p>
<p>Functions look like this (<a href="https://git.opengamestudio.org/kornerr/research-portable-memory/src/commit/6fcd542daa6242c8c23dddb88d04cda74a730328/v3/memory.cpp#L29">C++</a>):</p>
<pre><code class="python language-python"># Select item
@llm_by_value
def memory_selectItem(
  c: memory_Context
) -&gt; memory_Context:
  if (
    len(c.selectedItems) == 2
  ):
    c.selectedItems.clear()
  #}
  c.selectedItems.append(c.selectedId)
  c.recentField = "selectedItems"
  return c
#}
</code></pre>
<p>Limited language model functions have the following features:</p>
<ul>
<li><code>@llm_by_value</code> Python decorator is used to pass arguments by value instead of by reference (which is default in Python)</li>
<li>passing arguments by value is mandatory to limit function scope to only single context field, it's formalized Single Responsibility Principle</li>
<li>context contains <code>recentField</code> representing a stored "event"; this allows functions to run only when necessary field changes</li>
<li>function must use <code>recentField</code> to specify which field it changed or provide <code>none</code> if no action was performed</li>
<li>function takes only context as an input and only returns (an updated) context as an output</li>
</ul>
<p>"Memory" game logic has the following functions:</p>
<table>
<thead>
<tr>
<th>№</th>
<th>Function</th>
<th>Caller</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td><code>memory_generateConstPlayfield</code></td>
<td>User</td>
<td>Generate simplified playfield with items of the same group following each other sequentially</td>
</tr>
<tr>
<td>2</td>
<td><code>memory_selectItem</code></td>
<td>User</td>
<td>Select playfield item</td>
</tr>
<tr>
<td>3</td>
<td><code>memory_shouldDeselectMismatchedItems</code></td>
<td>System</td>
<td>Reaction to deselect a pair of the selected items of different groups</td>
</tr>
<tr>
<td>4</td>
<td><code>memory_shouldDetectVictory</code></td>
<td>System</td>
<td>Reaction to detect victory when all items got hidden</td>
</tr>
<tr>
<td>5</td>
<td><code>memory_shouldHideMatchingItems</code></td>
<td>System</td>
<td>Reaction to hide a pair of the selected items of the same group</td>
</tr>
</tbody>
</table>
<p>To verify functions work identically in both Python and C++, I cover each function with at least one test:</p>
<ul>
<li><code>memory_test_generateConstPlayfield</code></li>
<li><code>memory_test_selectItem_1x</code></li>
<li><code>memory_test_selectItem_2x</code></li>
<li><code>memory_test_selectItem_3x</code></li>
<li><code>memory_test_shouldDeselectMismatchedItems</code></li>
<li><code>memory_test_shouldDeselectMismatchedItems_itemTwice</code></li>
<li><code>memory_test_shouldDetectVictory</code></li>
<li><code>memory_test_shouldHideMatchingItems</code></li>
</ul>
<h1 id="mayplans">May plans</h1>
<p>I'll make a text UI for "Memory" game.</p>
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