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git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@534 48356398-32a2-884e-a903-53898d9a118a
36 lines
1.7 KiB
Plaintext
36 lines
1.7 KiB
Plaintext
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Configuration
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Configuration is documented on a per-use case: if a class uses a certain
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value from the configuration object, it has to define its name and what the
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value is used for. This means decentralized configuration declarations that
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are nevertheless error checking and a centralized configuration object.
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Directives are divided into namespaces, indicating the major portion of
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functionality they cover (although there may be overlaps. Please consult
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the documentation in ConfigDef for more information on these namespaces.
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Since configuration is dependant on context, internal classes require a
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configuration object to be passed as a parameter. (They also require a
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Context object).
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In relation to HTMLDefinition and CSSDefinition, there is a special class
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of directives that influence the *construction* of the Definition object.
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A standard call pattern would look like:
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1. Client calls Config->getHTMLDefinition()
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2. Config calls HTMLDefinition->createNew(this)
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3. HTMLDefinition constructs itself with base configuration
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4. HTMLDefinition calls Config->get('HTMLDefinition')
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5. Config returns array of directives that later construction
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6. HTMLDefinition performs operations and changes specified by directives
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7. HTMLPurifier returns constructed definition
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8. Config caches definition so it doesn't have to be generated again
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9. Config returns definition
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You could also override Config's copy of the definition with your own
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custom copy, which OVERRIDES all directives. Only the base, vanilla copy
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is the Singleton, the object actually interfaced with is a operated-upon
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clone of that object. Also, if an update to the directives would update
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the definition, you'd have to force reconstruction.
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