Page Speed Optimization Libraries  1.7.30.3
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net_instaweb::JsCombineFilter Class Reference

#include "js_combine_filter.h"

Inheritance diagram for net_instaweb::JsCombineFilter:
net_instaweb::RewriteFilter net_instaweb::CommonFilter

List of all members.

Public Member Functions

 JsCombineFilter (RewriteDriver *rewrite_driver)
virtual const char * id () const

Static Public Member Functions

static void InitStats (Statistics *statistics)
 Registers the provided statistics variable names with 'statistics'.

Static Public Attributes

static const char kJsFileCountReduction []
 statistics variable name

Protected Member Functions

virtual void StartDocumentImpl ()
 RewriteFilter overrides --- HTML parsing event handlers.
virtual void StartElementImpl (HtmlElement *element)
virtual void EndElementImpl (HtmlElement *element)
virtual void Characters (HtmlCharactersNode *characters)
virtual void Flush ()
virtual void DetermineEnabled ()
virtual void IEDirective (HtmlIEDirectiveNode *directive)
virtual const char * Name () const
virtual RewriteContextMakeRewriteContext ()
virtual const UrlSegmentEncoder * encoder () const

Friends

class JsCombineFilterTest

Detailed Description

Implements combining of multiple external JS files into one via the following transformation:

<script src="a.js"> <stuff> <script src="b.js">

gets turned into:

<script src="a.js+b.js"> <script>eval(mod_pagespeed_${hash("a.js")})</script> <stuff> <script>eval(mod_pagespeed_${hash("b.js")})</script>

where $hash stands for using the active Hasher and tweaking the result to be a valid identifier continuation. Further, the combined source file has the code: var mod_pagespeed_${hash("a.js")} = "code of a.js as a string literal"; var mod_pagespeed_${hash("b.js")} = "code of b.js as a string literal";


Constructor & Destructor Documentation

rewrite_driver is the context owning us, and filter_id is the ID we are registered under.


Member Function Documentation

virtual void net_instaweb::JsCombineFilter::Characters ( HtmlCharactersNode *  characters) [protected, virtual]

If a subclass overloads this function and wishes to use InsertNodeAtBodyEnd(), it needs to make an upcall to this implementation for InsertNodeAtBodyEnd() to work correctly.

Reimplemented from net_instaweb::CommonFilter.

virtual void net_instaweb::JsCombineFilter::DetermineEnabled ( ) [protected, virtual]

Override DetermineEnabled so that filters that use the DOM cohort of the property cache can enable writing of it in the RewriterDriver. Filters inheriting from RewriteDriver that use the DOM cohort should override UsePropertyCacheDomCohort to return true.

Reimplemented from net_instaweb::RewriteFilter.

virtual const UrlSegmentEncoder* net_instaweb::JsCombineFilter::encoder ( ) const [inline, protected, virtual]

All RewriteFilters define how they encode URLs and other associated information needed for a rewrite into a URL. The default implementation handles a single URL with no extra data. The filter owns the encoder.

Reimplemented from net_instaweb::RewriteFilter.

Generates a RewriteContext appropriate for this filter. Default implementation returns NULL. This must be overridden by filters. This is used to implement Fetch.

Reimplemented from net_instaweb::RewriteFilter.


The documentation for this class was generated from the following file:
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