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<title>3/tp</title>
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<!--Weave of '3/dvc' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">★</a></li><li><a href="index.html">if</a></li><li><a href="index.html#3">Chapter 3: Space and Time</a></li><li><b>Devices</b></li></ul><p class="purpose">A plugin giving minimal support for switchable devices.</p>
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. </b>The Devices plugin does just one thing: it applies an indicator property
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to things of the kind "device". This used to be accomplished by the Standard
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Rules in a clumsy sort of way (with a direct I6 code injection), but in the
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age of Inter we want to avoid that sort of tomfoolery.
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</p>
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<pre class="display">
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<span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">K_device</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="identifier">property</span><span class="plain"> *</span><span class="identifier">P_switchable</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b></p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">PL::Devices::start</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="identifier">PLUGIN_REGISTER</span><span class="plain">(</span><span class="identifier">PLUGIN_NEW_BASE_KIND_NOTIFY</span><span class="plain">, </span><span class="functiontext">PL::Devices::devices_new_base_kind_notify</span><span class="plain">);</span>
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<span class="identifier">PLUGIN_REGISTER</span><span class="plain">(</span><span class="identifier">PLUGIN_COMPLETE_MODEL</span><span class="plain">, </span><span class="functiontext">PL::Devices::IF_complete_model</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Devices::start appears nowhere else.</p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. </b></p>
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<pre class="display">
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<span class="plain"><</span><span class="identifier">notable</span><span class="plain">-</span><span class="identifier">device</span><span class="plain">-</span><span class="identifier">kinds</span><span class="plain">> ::=</span>
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<span class="identifier">device</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP4"></a><b>§4. </b></p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Devices::devices_new_base_kind_notify</span><span class="plain">(</span><span class="identifier">kind</span><span class="plain"> *</span><span class="identifier">new_base</span><span class="plain">, </span><span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">name</span><span class="plain">, </span><span class="identifier">wording</span><span class="plain"> </span><span class="identifier">W</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (<</span><span class="identifier">notable</span><span class="plain">-</span><span class="identifier">device</span><span class="plain">-</span><span class="identifier">kinds</span><span class="plain">>(</span><span class="identifier">W</span><span class="plain">)) { </span><span class="identifier">K_device</span><span class="plain"> = </span><span class="identifier">new_base</span><span class="plain">; </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">TRUE</span><span class="plain">; }</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Devices::devices_new_base_kind_notify is used in <a href="#SP2">§2</a>.</p>
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<p class="inwebparagraph"><a id="SP5"></a><b>§5. </b></p>
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<pre class="display">
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<span class="reserved">int</span><span class="plain"> </span><span class="functiontext">PL::Devices::IF_complete_model</span><span class="plain">(</span><span class="reserved">int</span><span class="plain"> </span><span class="identifier">stage</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">stage</span><span class="plain"> == 3) {</span>
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<span class="identifier">P_switchable</span><span class="plain"> = </span><span class="identifier">Properties::EitherOr::new_nameless</span><span class="plain">(</span><span class="identifier">L</span><span class="string">"switchable"</span><span class="plain">);</span>
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<span class="identifier">Properties::EitherOr::implement_as_attribute</span><span class="plain">(</span><span class="identifier">P_switchable</span><span class="plain">, </span><span class="identifier">TRUE</span><span class="plain">);</span>
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<span class="identifier">instance</span><span class="plain"> *</span><span class="identifier">I</span><span class="plain">;</span>
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<span class="identifier">LOOP_OVER_OBJECT_INSTANCES</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">)</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">Instances::of_kind</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">, </span><span class="identifier">K_device</span><span class="plain">))</span>
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<span class="identifier">Properties::EitherOr::assert</span><span class="plain">(</span>
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<span class="identifier">P_switchable</span><span class="plain">, </span><span class="identifier">Instances::as_subject</span><span class="plain">(</span><span class="identifier">I</span><span class="plain">), </span><span class="identifier">TRUE</span><span class="plain">, </span><span class="identifier">CERTAIN_CE</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">FALSE</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function PL::Devices::IF_complete_model is used in <a href="#SP2">§2</a>.</p>
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<hr class="tocbar">
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<ul class="toc"><li><a href="3-tp.html">Back to 'The Player'</a></li><li><a href="3-bck.html">Continue with 'Backdrops'</a></li></ul><hr class="tocbar">
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<!--End of weave-->
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