smarty/docs/ru/programmers/plugins.xml

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 <chapter id="plugins">
  <title>Extending Smarty With Plugins</title>
  <para>
   Version 2.0 introduced the plugin architecture that is used
   for almost all the customizable functionality of Smarty. This includes:
   <itemizedlist spacing="compact">
    <listitem><simpara>functions</simpara></listitem>
    <listitem><simpara>modifiers</simpara></listitem>
    <listitem><simpara>block functions</simpara></listitem>
    <listitem><simpara>compiler functions</simpara></listitem>
    <listitem><simpara>prefilters</simpara></listitem>
    <listitem><simpara>postfilters</simpara></listitem>
    <listitem><simpara>outputfilters</simpara></listitem>
    <listitem><simpara>resources</simpara></listitem>
    <listitem><simpara>inserts</simpara></listitem>
   </itemizedlist>
   With the exception of resources, backwards compatibility with the old
   way of registering handler functions via register_* API is preserved. If
   you did not use the API but instead modified the class variables
   <literal>$custom_funcs</literal>, <literal>$custom_mods</literal>, and
   other ones directly, then you will need to adjust your scripts to either
   use the API or convert your custom functionality into plugins.
  </para>
   
  <sect1>
   <title>How Plugins Work</title>
   <para>
    Plugins are always loaded on demand. Only the specific modifiers,
    functions, resources, etc invoked in the templates scripts will be
    loaded. Moreover, each plugin is loaded only once, even if you have
    several different instances of Smarty running within the same request.
   </para>
   <para>
    Pre/postfilters and output filters are a bit of a special case. Since
    they are not mentioned in the templates, they must be registered or
    loaded explicitly via API functions before the template is processed.
    The order in which multiple filters of the same type are executed
    depends on the order in which they are registered or loaded.
   </para>
   <para>
    There is only one plugins directory (for performance reasons). To
    install a plugin, simply place it in the directory and Smarty will use
    it automatically.
   </para>

&programmers.plugins.plugins-naming-conventions;

&programmers.plugins.plugins-writing;

&programmers.plugins.plugins-functions;

&programmers.plugins.plugins-modifiers;

&programmers.plugins.plugins-block-functions;

&programmers.plugins.plugins-compiler-functions;

&programmers.plugins.plugins-prefilters-postfilters;

&programmers.plugins.plugins-outputfilters;

&programmers.plugins.plugins-resources;

&programmers.plugins.plugins-inserts;
</chapter>
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