ecs: add callbackFiltered and emitFiltered

docs/modules/ecs.html

@@ -323,10 +323,18 @@ end
     <td class="summary">Trigger a custom callback on a single entity.</td>
     </tr>
     <tr>
+    <td class="name" nowrap><a href="#System:callbackFiltered">System:callbackFiltered (filter, name, e, ...)</a></td>
+    <td class="summary">Same as <a href="../modules/ecs.html#System:callback">callback</a>, but will check every system against a filter before calling the callback.</td>
+    </tr>
+    <tr>
     <td class="name" nowrap><a href="#System:emit">System:emit (name, ...)</a></td>
     <td class="summary">Emit an event on the system.</td>
     </tr>
     <tr>
+    <td class="name" nowrap><a href="#System:emitFiltered">System:emitFiltered (filter, name, ...)</a></td>
+    <td class="summary">Same as <a href="../modules/ecs.html#System:emit">emit</a>, but will check every system against a filter before calling the event.</td>
+    </tr>
+    <tr>
     <td class="name" nowrap><a href="#System:destroy">System:destroy ()</a></td>
     <td class="summary">Remove all the entities and subsystems in this system.</td>
     </tr>
@@ -1799,6 +1807,48 @@ avoid repeating your filters or allow controlling several system from a single p
 
 
 
+</dd>
+    <dt>
+    <a name = "System:callbackFiltered"></a>
+    <strong>System:callbackFiltered (filter, name, e, ...)</strong>
+    </dt>
+    <dd>
+    Same as <a href="../modules/ecs.html#System:callback">callback</a>, but will check every system against a filter before calling the callback. </p>
+
+<p> <a href="../modules/ecs.html#System:filter">filter</a> is a function that receive the arguments <code>filter(system, name, e, &hellip;)</code>, and returns a boolean.
+ It will be called on each system before emitting the callback on it; if the filter returns false, the callback will not
+ be called on this system and its subsystems.</p>
+
+<p> Complexity: O(1) per system
+
+    </ul>
+    </ul>
+    </ul>
+    </ul>
+
+    <h3>Parameters:</h3>
+    <ul>
+          <li><span class="parameter">filter</span>
+              <span class="types"><span class="type">function</span></span>
+           filter function
+          </li>
+          <li><span class="parameter">name</span>
+              <span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
+           name of the callback
+          </li>
+          <li><span class="parameter">e</span>
+              <span class="types"><a class="type" href="../modules/ecs.html#Entity_objects">Entity</a></span>
+           the entity to perform the callback on
+          </li>
+          <li><span class="parameter">...</span>
+           other arguments to pass to the callback
+          </li>
+    </ul>
+
+
+
+
+
 </dd>
     <dt>
     <a name = "System:emit"></a>
@@ -1849,6 +1899,44 @@ its sibling systems (i.e. completely stop the propagation of the event).</li>
 
 
 
+</dd>
+    <dt>
+    <a name = "System:emitFiltered"></a>
+    <strong>System:emitFiltered (filter, name, ...)</strong>
+    </dt>
+    <dd>
+    Same as <a href="../modules/ecs.html#System:emit">emit</a>, but will check every system against a filter before calling the event. </p>
+
+<p> <a href="../modules/ecs.html#System:filter">filter</a> is a function that receive the arguments <code>filter(system, name, &hellip;)</code>, and returns a boolean.
+ It will be called on each system before emitting the event on it; if the filter returns false, the event will not
+ be emitted to this system and its subsystems.</p>
+
+<p> Complexity: O(1) per system
+
+    </ul>
+    </ul>
+    </ul>
+    </ul>
+
+    <h3>Parameters:</h3>
+    <ul>
+          <li><span class="parameter">filter</span>
+              <span class="types"><span class="type">function</span></span>
+           filter function
+          </li>
+          <li><span class="parameter">name</span>
+              <span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
+           name of the callback
+          </li>
+          <li><span class="parameter">...</span>
+           other arguments to pass to the callback
+          </li>
+    </ul>
+
+
+
+
+
 </dd>
     <dt>
     <a name = "System:destroy"></a>
@@ -1876,7 +1964,7 @@ its sibling systems (i.e. completely stop the propagation of the event).</li>
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