Page Speed Optimization Libraries
1.7.30.2
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Public Member Functions | |
CriticalSelectorFilter (RewriteDriver *rewrite_driver) | |
virtual const char * | Name () const |
virtual const char * | id () const |
virtual bool | AllowUnauthorizedDomain () const |
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. |
virtual bool net_instaweb::CriticalSelectorFilter::AllowUnauthorizedDomain | ( | ) | const [inline, virtual] |
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.