Page Speed Optimization Libraries  1.8.31.2
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net_instaweb::CriticalSelectorFilter Class Reference
Inheritance diagram for net_instaweb::CriticalSelectorFilter:
net_instaweb::CssSummarizerBase net_instaweb::RewriteFilter net_instaweb::CommonFilter

List of all members.

Public Member Functions

 CriticalSelectorFilter (RewriteDriver *rewrite_driver)
virtual const char * Name () const
virtual const char * id () const
virtual
RewriteDriver::InlineAuthorizationPolicy 
AllowUnauthorizedDomain () const
virtual bool IntendedForInlining () const
 Selectors are inlined into the html.

Static Public Attributes

static const char kAddStylesFunction []
static const char kAddStylesInvocation []
static const char kApplyFlushEarlyCss []
static const char kInvokeFlushEarlyCssTemplate []
static const char kMoveScriptId []
static const char kNoscriptStylesClass []

Protected Member Functions

virtual void Summarize (Css::Stylesheet *stylesheet, GoogleString *out) const
virtual void RenderSummary (int pos, HtmlElement *element, HtmlCharactersNode *char_node, bool *is_element_deleted)
virtual void WillNotRenderSummary (int pos, HtmlElement *element, HtmlCharactersNode *char_node, bool *is_element_deleted)
virtual GoogleString CacheKeySuffix () const
virtual void StartDocumentImpl ()
 Parser callbacks.
virtual void EndDocument ()
virtual void RenderDone ()
virtual void DetermineEnabled ()
 Filter control API.

Member Function Documentation

This filter needs access to all critical selectors (even those from unauthorized domains) in order to inline them into HTML. Inlining css from unauthorized domains into HTML is considered safe because it does not cause any new content to be executed compared to the unoptimized page.

Reimplemented from net_instaweb::CommonFilter.

virtual GoogleString net_instaweb::CriticalSelectorFilter::CacheKeySuffix ( ) const [protected, virtual]

Since our computation depends on the selectors that are relevant to the webpage, we incorporate them into the cache key as well.

Reimplemented from net_instaweb::CssSummarizerBase.

virtual void net_instaweb::CriticalSelectorFilter::RenderSummary ( int  pos,
HtmlElement *  element,
HtmlCharactersNode *  char_node,
bool *  is_element_deleted 
) [protected, virtual]

This can be optionally overridden to modify a CSS element based on a successfully computed summary. It might not be invoked if cached information is not readily available, and will not be invoked if CSS parsing failed or some other error occurred. Invocation occurs from a thread with HTML parser context state, so both DOM modification and GetSummaryForStyle() are safe to use. If invoked, the method will be called before SummariesDone().

pos is the position of the element in the summary table.

element points to the <link> or <style> element that was summarized. If the element was a <style>, char_node will also point to its contents node; otherwise it will be NULL. Overrides need to set is_element_deleted to true if they delete the element.

The default implementation does nothing.

Reimplemented from net_instaweb::CssSummarizerBase.

virtual void net_instaweb::CriticalSelectorFilter::Summarize ( Css::Stylesheet *  stylesheet,
GoogleString *  out 
) const [protected, virtual]

Overrides of CssSummarizerBase summary API. These help us compute the critical portions of the various fragments in the page, and to write them out to the page. We also use this to pick up the output of filters before us, like rewrite_css; so we run this even on things that will not contain on-screen critical CSS.

Implements net_instaweb::CssSummarizerBase.

virtual void net_instaweb::CriticalSelectorFilter::WillNotRenderSummary ( int  pos,
HtmlElement *  element,
HtmlCharactersNode *  char_node,
bool *  is_element_deleted 
) [protected, virtual]

Like RenderSummary, but called in cases where we're unable to render a summary for some reason (including not being able to compute one). Note: not called when we're canceled due to disable_further_processing.

Like with RenderSummary, this corresponds to entry [pos] in the summary table, and elements points to the <link> or <style> containing CSS, with char_node being non-null in case it was a <style>. Overrides need to set is_element_deleted to true if they delete the element.

Reimplemented from net_instaweb::CssSummarizerBase.


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