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

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@@ -30,6 +30,31 @@
<center>
<h1>News</h1>
<div class="news_item">
<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
</p>
<div class="news_item_contents">
<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>
<p>```python
class memory_Context:
def <strong>init</strong>(self):
self.hiddenItems = []. . .</p>
</div>
<div class="news_item_more">
<a href="memory-logic.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="llm-first-py-cxx.html">The first example of a portable code</a>
@@ -204,23 +229,6 @@ It seems that right now we have less completed features than before the release
<a href="the-pros-and-cons-of-restarting-from-scratch.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="on-the-way-to-durable-applications.html">On the way to durable applications</a>
</h2>
<p class="news_item_date">
2019-08-05 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2019-08-05_on-the-way-to-durable-applications.jpg" alt="Pskov's veche" /></p>
<p>This article describes our first durable application for desktop PCs: PSKOV static site generator.</p>
<p><strong>Durability</strong></p>
<p>A durable application is an application that functions without a single change on operating systems released in years 2010-2030. In other words, a durable application has backward compatibility of 10 years and has the stability to run for 10 years. Actually, <a href="http://opengamestudio.org/pskov">PSKOV</a> runs even under Windows 2000, so PSKOV has backward compatibility of 19 years.. . .</p>
</div>
<div class="news_item_more">
<a href="on-the-way-to-durable-applications.html">Continue reading</a>
</div>
</div>
<p class="pagination_title">Page 1 of 7</p>
<p>

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@@ -30,6 +30,23 @@
<center>
<h1>News</h1>
<div class="news_item">
<h2 class="news_item_title">
<a href="on-the-way-to-durable-applications.html">On the way to durable applications</a>
</h2>
<p class="news_item_date">
2019-08-05 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2019-08-05_on-the-way-to-durable-applications.jpg" alt="Pskov's veche" /></p>
<p>This article describes our first durable application for desktop PCs: PSKOV static site generator.</p>
<p><strong>Durability</strong></p>
<p>A durable application is an application that functions without a single change on operating systems released in years 2010-2030. In other words, a durable application has backward compatibility of 10 years and has the stability to run for 10 years. Actually, <a href="http://opengamestudio.org/pskov">PSKOV</a> runs even under Windows 2000, so PSKOV has backward compatibility of 19 years.. . .</p>
</div>
<div class="news_item_more">
<a href="on-the-way-to-durable-applications.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="defending-availability.html">Defending availability</a>
@@ -185,33 +202,6 @@
<a href="openscenegraph-examples.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="mahjong-techdemo1-gameplay.html">First techdemo of OGS Mahjong 2: Gameplay</a>
</h2>
<p class="news_item_date">
2018-02-16 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2018-02-16-mahjong-techdemo1-gameplay.png" alt="End of a Mahjong party" /></p>
<p>We are glad to announce the release of the first technical demonstration of OGS Mahjong 2. The purpose of this release was to verify gameplay across supported platforms.</p>
<p>Get techdemo for your platform:</p>
<ul>
<li>Run <a href="https://ogstudio.github.io/game-mahjong/versions/013/mjin-player.html">Web version</a> in your browser</li>
<li>Get <a href="https://drive.google.com/open?id=1KW8IEN8Dpz8ODeg8BctVSJyzj9-AL9hR">Android version</a></li>
<li>Get <a href="https://drive.google.com/open?id=1oj0-OXSmEatttzn86u2vgP9SRAIC0ozB">Windows version</a></li>
<li>Get <a href="https://drive.google.com/open?id=1EX7kLIThLiMz9_W7VmBPySms3mlrF-i6">Linux version</a></li>
<li>Get <a href="https://drive.google.com/open?id=1KWnvbHzan8MpMcZPG2QC-7KWoEYbqrM2">macOS version</a></li>
</ul>
<p>Notes:</p>
<ul>
<li>iOS version is not released because it cannot be easily shared outside AppStore.. . .</li>
</ul>
</div>
<div class="news_item_more">
<a href="mahjong-techdemo1-gameplay.html">Continue reading</a>
</div>
</div>
<p class="pagination_title">Page 2 of 7</p>
<p>

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@@ -30,6 +30,33 @@
<center>
<h1>News</h1>
<div class="news_item">
<h2 class="news_item_title">
<a href="mahjong-techdemo1-gameplay.html">First techdemo of OGS Mahjong 2: Gameplay</a>
</h2>
<p class="news_item_date">
2018-02-16 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2018-02-16-mahjong-techdemo1-gameplay.png" alt="End of a Mahjong party" /></p>
<p>We are glad to announce the release of the first technical demonstration of OGS Mahjong 2. The purpose of this release was to verify gameplay across supported platforms.</p>
<p>Get techdemo for your platform:</p>
<ul>
<li>Run <a href="https://ogstudio.github.io/game-mahjong/versions/013/mjin-player.html">Web version</a> in your browser</li>
<li>Get <a href="https://drive.google.com/open?id=1KW8IEN8Dpz8ODeg8BctVSJyzj9-AL9hR">Android version</a></li>
<li>Get <a href="https://drive.google.com/open?id=1oj0-OXSmEatttzn86u2vgP9SRAIC0ozB">Windows version</a></li>
<li>Get <a href="https://drive.google.com/open?id=1EX7kLIThLiMz9_W7VmBPySms3mlrF-i6">Linux version</a></li>
<li>Get <a href="https://drive.google.com/open?id=1KWnvbHzan8MpMcZPG2QC-7KWoEYbqrM2">macOS version</a></li>
</ul>
<p>Notes:</p>
<ul>
<li>iOS version is not released because it cannot be easily shared outside AppStore.. . .</li>
</ul>
</div>
<div class="news_item_more">
<a href="mahjong-techdemo1-gameplay.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="mahjong-recreation-start.html">Mahjong recreation start</a>
@@ -177,22 +204,6 @@
<a href="ios-tutorial.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="osg-sample.html">OpenSceneGraph sample</a>
</h2>
<p class="news_item_date">
2017-05-12 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2017-05_osg-sample.png" alt="Rocket in the distance" /></p>
<p>This article describes creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
<p>Previous tutorials described how to install OpenSceneGraph under Linux, macOS, Windows and render a model using the standard <strong>osgviewer</strong> tool. This time we worked on a <a href="https://github.com/OGStudio/openscenegraph-cross-platform-guide-application">sample OpenSceneGraph application</a> that would run under Linux, macOS, Windows, and Android.. . .</p>
</div>
<div class="news_item_more">
<a href="osg-sample.html">Continue reading</a>
</div>
</div>
<p class="pagination_title">Page 3 of 7</p>
<p>

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@@ -30,6 +30,22 @@
<center>
<h1>News</h1>
<div class="news_item">
<h2 class="news_item_title">
<a href="osg-sample.html">OpenSceneGraph sample</a>
</h2>
<p class="news_item_date">
2017-05-12 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2017-05_osg-sample.png" alt="Rocket in the distance" /></p>
<p>This article describes creation of the tutorials for building sample OpenSceneGraph application under Linux, macOS, Windows, and Android in April 2017.</p>
<p>Previous tutorials described how to install OpenSceneGraph under Linux, macOS, Windows and render a model using the standard <strong>osgviewer</strong> tool. This time we worked on a <a href="https://github.com/OGStudio/openscenegraph-cross-platform-guide-application">sample OpenSceneGraph application</a> that would run under Linux, macOS, Windows, and Android.. . .</p>
</div>
<div class="news_item_more">
<a href="osg-sample.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="its-all-fine.html">It's all fine</a>
@@ -184,25 +200,6 @@
<a href="2016-september-recap.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="ogs-editor-0.10.html">OGS Editor 0.10 and live session materials</a>
</h2>
<p class="news_item_date">
2016-10-03 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2016-10-03_ogs-editor-0.10.png" alt="OGS Editor with Mahjong game" /></p>
<p>Note: we won't release 0.10 for macOS due to technical difficulties with the build system. macOS support will be back for 0.11.</p>
<ul>
<li><strong>OGS Editor 0.10</strong> <a href="https://sourceforge.net/projects/osrpgcreation/files/Editor/jenkins/51_2016-10-01_06-39-48_0.10.0/">is available at SourceForge</a>. Simply unpack the archive and launch the run script.</li>
<li><strong>Mahjong Solitaire game</strong> <a href="https://sourceforge.net/projects/osrpgcreation/files/Games/MahjongSolitaire/">is available at SourceForge</a>, too. Simply unpack the archive and launch the run script.. . .</li>
</ul>
</div>
<div class="news_item_more">
<a href="ogs-editor-0.10.html">Continue reading</a>
</div>
</div>
<p class="pagination_title">Page 4 of 7</p>
<p>

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@@ -30,6 +30,25 @@
<center>
<h1>News</h1>
<div class="news_item">
<h2 class="news_item_title">
<a href="ogs-editor-0.10.html">OGS Editor 0.10 and live session materials</a>
</h2>
<p class="news_item_date">
2016-10-03 00:00
</p>
<div class="news_item_contents">
<p><img src="../../images/2016-10-03_ogs-editor-0.10.png" alt="OGS Editor with Mahjong game" /></p>
<p>Note: we won't release 0.10 for macOS due to technical difficulties with the build system. macOS support will be back for 0.11.</p>
<ul>
<li><strong>OGS Editor 0.10</strong> <a href="https://sourceforge.net/projects/osrpgcreation/files/Editor/jenkins/51_2016-10-01_06-39-48_0.10.0/">is available at SourceForge</a>. Simply unpack the archive and launch the run script.</li>
<li><strong>Mahjong Solitaire game</strong> <a href="https://sourceforge.net/projects/osrpgcreation/files/Games/MahjongSolitaire/">is available at SourceForge</a>, too. Simply unpack the archive and launch the run script.. . .</li>
</ul>
</div>
<div class="news_item_more">
<a href="ogs-editor-0.10.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="yesterdays-live-session-short-overview.html">A few words about live session yesterday</a>
@@ -168,24 +187,6 @@ It's time to create simple Mahjong solitaire game.</p>
<a href="may-live-session-announcement.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="may-live-session-decision.html">May live session (Editor 0.9)</a>
</h2>
<p class="news_item_date">
2016-04-24 00:00
</p>
<div class="news_item_contents">
<p>As you know, the previously published roadmap assumed, that we would hold a live session in April and it would feature a ping-pong game created with Editor 0.9.</p>
<p>We have to admit, our abilities to plan are not yet good enough. That's why the next live session will take place by the end of May. The exact date will be announced later.</p>
<p>Here's a short preview of the coming game:</p>
<iframe width="560" height="315" src="https://www.youtube.com/embed/V3EvCVPc6kg" frameborder="0" allowfullscreen></iframe>
<p>. . .</p>
</div>
<div class="news_item_more">
<a href="may-live-session-decision.html">Continue reading</a>
</div>
</div>
<p class="pagination_title">Page 5 of 7</p>
<p>

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@@ -30,6 +30,24 @@
<center>
<h1>News</h1>
<div class="news_item">
<h2 class="news_item_title">
<a href="may-live-session-decision.html">May live session (Editor 0.9)</a>
</h2>
<p class="news_item_date">
2016-04-24 00:00
</p>
<div class="news_item_contents">
<p>As you know, the previously published roadmap assumed, that we would hold a live session in April and it would feature a ping-pong game created with Editor 0.9.</p>
<p>We have to admit, our abilities to plan are not yet good enough. That's why the next live session will take place by the end of May. The exact date will be announced later.</p>
<p>Here's a short preview of the coming game:</p>
<iframe width="560" height="315" src="https://www.youtube.com/embed/V3EvCVPc6kg" frameborder="0" allowfullscreen></iframe>
<p>. . .</p>
</div>
<div class="news_item_more">
<a href="may-live-session-decision.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="rolling-ball.html">"Rolling ball" live session videos and downloads</a>
@@ -166,23 +184,6 @@
<a href="soon-game-creation-editor-07.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="bye-desura-hello-humblebundle.html">Desura no more, hello Humble Bundle Widget</a>
</h2>
<p class="news_item_date">
2015-07-23 00:00
</p>
<div class="news_item_contents">
<p>After the recent bankruptcy of Desura's parent company, we decided, that we need a new place for our Deluxe version. Something better, more modern and more trustworthy. We have chosen the Humble Widget, with which you can buy the deluxe version of the game without leaving our site.</p>
<p>Here it is:</p>
<iframe src="https://www.humblebundle.com/widget/v2/product/ogsmahjong/ySGF3h34?theme=transparent-light" width="526" height="325" style="border: none;" scrolling="no" frameborder="0"></iframe>
<p>We haven't received a single penny from Desura (due to the minimal cache out limitations), but if you bought the deluxe version from them and experiencing any problems with downloading it (right now we see no problems with that), send us a letter, tell your name on Desura, we'll figure something out.. . .</p>
</div>
<div class="news_item_more">
<a href="bye-desura-hello-humblebundle.html">Continue reading</a>
</div>
</div>
<p class="pagination_title">Page 6 of 7</p>
<p>

17
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@@ -30,6 +30,23 @@
<center>
<h1>News</h1>
<div class="news_item">
<h2 class="news_item_title">
<a href="bye-desura-hello-humblebundle.html">Desura no more, hello Humble Bundle Widget</a>
</h2>
<p class="news_item_date">
2015-07-23 00:00
</p>
<div class="news_item_contents">
<p>After the recent bankruptcy of Desura's parent company, we decided, that we need a new place for our Deluxe version. Something better, more modern and more trustworthy. We have chosen the Humble Widget, with which you can buy the deluxe version of the game without leaving our site.</p>
<p>Here it is:</p>
<iframe src="https://www.humblebundle.com/widget/v2/product/ogsmahjong/ySGF3h34?theme=transparent-light" width="526" height="325" style="border: none;" scrolling="no" frameborder="0"></iframe>
<p>We haven't received a single penny from Desura (due to the minimal cache out limitations), but if you bought the deluxe version from them and experiencing any problems with downloading it (right now we see no problems with that), send us a letter, tell your name on Desura, we'll figure something out.. . .</p>
</div>
<div class="news_item_more">
<a href="bye-desura-hello-humblebundle.html">Continue reading</a>
</div>
</div>
<div class="news_item">
<h2 class="news_item_title">
<a href="test-chamber-for-everyone.html">Test chamber for everyone (Editor 0.7.0)</a>

162
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@@ -0,0 +1,162 @@
<!DOCTYPE html>
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<link rel="stylesheet" href="../../style.css">
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</a>
<div class="clear"></div>
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</div>
<h3 class="left_item_title">In the news...</h3>
<center>
<div class="news_item">
<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
</p>
<div class="news_item_contents">
<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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