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56 lines
2.7 KiB
Plaintext
56 lines
2.7 KiB
Plaintext
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Naming
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The classes in this library follow a few naming conventions, which may
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help you find the correct functionality more quickly. Here they are:
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All classes occupy the HTMLPurifier pseudo-namespace.
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This means that all classes are prefixed with HTMLPurifier_. As such, all
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names under HTMLPurifier_ are reserved, and userspace extensions should
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be registered in a different namespace (or the main namespace).
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All classes correspond to their path if library/ was in the include path
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HTMLPurifier_AttrDef is located at HTMLPurifier/AttrDef.php; replace
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underscores with slashes and append .php and you'll have the location of
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the class.
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Harness and Test are reserved class names for unit tests
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The suffix "Test" indicates that the class is a subclass of UnitTestCase
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(of the Simpletest library) and is testable. "Harness" indicates a subclass
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of UnitTestCase that is not meant to be run but to be extended into
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concrete test cases and contains custom test methods (i.e. assert*())
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Class names do not necessarily represent inheritance hierarchies
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While we try to reflect inheritance in naming to some extent, it is not
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guaranteed (for instance, none of the classes inherit from HTMLPurifier,
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the base class). However, all class files have the require_once
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declarations to whichever classes they are tightly coupled to.
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Strategy has a meaning different from the Gang of Four pattern
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In Design Patterns, the Gang of Four describes a Strategy object as
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encapsulating an algorithm so that they can be switched at run-time. While
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our strategies are indeed algorithms, they are not meant to be substituted:
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all must be present in order for proper functioning.
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Abbreviations are avoided
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We try to avoid abbreviations as much as possible, but in some cases,
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abbreviated version is more readable than the full version. Here, we
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list common abbreviations:
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Attr(s) -> Attribute(s)
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Def -> Definition
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Ambiguity concerning the definition of Def/Definition
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While a definition normally defines the structure/acceptable values of
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an entity, most of the definitions in this application also attempt
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to validate and fix the value. I am unsure of a better name, as
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"Validator" would exclude fixing the value, "Fixer" doesn't invoke
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the proper image of "fixing" something, and "ValidatorFixer" is too long!
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Some other suggestions were "Handler", "Reference", "Check", "Fix",
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"Repair" and "Heal".
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Transform not Transformer
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Transform is both a noun and a verb, and thus we define a "Transform" as
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something that "transforms," leaving "Transformer" (which sounds like an
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electrical device/robot toy).
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