docs/dev-naming.html

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   9 <title>Naming Conventions - HTML Purifier</title>
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  12
  13 <h1>Naming Conventions</h1>
  14
  15 <div id="filing">Filed under Development</div>
  16 <div id="index">Return to the <a href="index.html">index</a>.</div>
  17 <div id="home"><a href="http://htmlpurifier.org/">HTML Purifier</a> End-User Documentation</div>
  18
  19 <p>The classes in this library follow a few naming conventions, which may
  20 help you find the correct functionality more quickly.  Here they are:</p>
  21
  22 <dl>
  23
  24 <dt>All classes occupy the HTMLPurifier pseudo-namespace.</dt>
  25     <dd>This means that all classes are prefixed with HTMLPurifier_.  As such, all
  26     names under HTMLPurifier_ are reserved.  I recommend that you use the name
  27     HTMLPurifierX_YourName_ClassName, especially if you want to take advantage
  28     of HTMLPurifier_ConfigDef.</dd>
  29
  30 <dt>All classes correspond to their path if library/ was in the include path</dt>
  31     <dd>HTMLPurifier_AttrDef is located at HTMLPurifier/AttrDef.php; replace
  32     underscores with slashes and append .php and you'll have the location of
  33     the class.</dd>
  34
  35 <dt>Harness and Test are reserved class names for unit tests</dt>
  36     <dd>The suffix <code>Test</code> indicates that the class is a subclass of UnitTestCase
  37     (of the Simpletest library) and is testable. "Harness" indicates a subclass
  38     of UnitTestCase that is not meant to be run but to be extended into
  39     concrete test cases and contains custom test methods (i.e. assert*())</dd>
  40
  41 <dt>Class names do not necessarily represent inheritance hierarchies</dt>
  42     <dd>While we try to reflect inheritance in naming to some extent, it is not
  43     guaranteed (for instance, none of the classes inherit from HTMLPurifier,
  44     the base class).  However, all class files have the require_once
  45     declarations to whichever classes they are tightly coupled to.</dd>
  46
  47 <dt>Strategy has a meaning different from the Gang of Four pattern</dt>
  48     <dd>In Design Patterns, the Gang of Four describes a Strategy object as
  49     encapsulating an algorithm so that they can be switched at run-time.  While
  50     our strategies are indeed algorithms, they are not meant to be substituted:
  51     all must be present in order for proper functioning.</dd>
  52
  53 <dt>Abbreviations are avoided</dt>
  54     <dd>We try to avoid abbreviations as much as possible, but in some cases,
  55     abbreviated version is more readable than the full version. Here, we
  56     list common abbreviations:
  57     <ul>
  58         <li>Attr to Attributes (note that it is plural, i.e. <code>$attr = array()</code>)</li>
  59         <li>Def to Definition</li>
  60         <li><code>$ret</code> is the value to be returned in a function</li>
  61     </ul>
  62     </dd>
  63
  64 <dt>Ambiguity concerning the definition of Def/Definition</dt>
  65     <dd>While a definition normally defines the structure/acceptable values of
  66     an entity, most of the definitions in this application also attempt
  67     to validate and fix the value.  I am unsure of a better name, as
  68     "Validator" would exclude fixing the value, "Fixer" doesn't invoke
  69     the proper image of "fixing" something, and "ValidatorFixer" is too long!
  70     Some other suggestions were "Handler", "Reference", "Check", "Fix",
  71     "Repair" and "Heal".</dd>
  72
  73 <dt>Transform not Transformer</dt>
  74     <dd>Transform is both a noun and a verb, and thus we define a "Transform" as
  75     something that "transforms," leaving "Transformer" (which sounds like an
  76     electrical device/robot toy).</dd>
  77
  78 </dl>
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