net_instaweb::AddHeadFilter Class Reference

#include "add_head_filter.h"

Inheritance diagram for net_instaweb::AddHeadFilter:

Public Member Functions
	AddHeadFilter (HtmlParse *parser, bool combine_multiple_heads)
virtual void	StartDocument ()
virtual void	StartElement (HtmlElement *element)
virtual void	EndDocument ()
virtual void	EndElement (HtmlElement *element)
virtual void	Flush ()
virtual const char *	Name () const
	The name of this filter – used for logging and debugging.
Public Member Functions inherited from net_instaweb::EmptyHtmlFilter
virtual void	Cdata (HtmlCdataNode *cdata)
	Called for CDATA blocks (e.g. <![CDATA[foobar]]>)
virtual void	Comment (HtmlCommentNode *comment)
	Called for HTML comments that aren't IE directives (e.g. ).
virtual void	IEDirective (HtmlIEDirectiveNode *directive)
virtual void	Characters (HtmlCharactersNode *characters)
	Called for raw characters between tags.
virtual void	Directive (HtmlDirectiveNode *directive)
	Called for HTML directives (e.g. <!doctype foobar>).
virtual void	DetermineEnabled (GoogleString *disabled_reason)
virtual bool	CanModifyUrls ()
ScriptUsage	GetScriptUsage () const override
Public Member Functions inherited from net_instaweb::HtmlFilter
virtual void	RenderDone ()
bool	is_enabled () const
void	set_is_enabled (bool is_enabled)

Additional Inherited Members
Public Types inherited from net_instaweb::HtmlFilter
enum	ScriptUsage { kWillInjectScripts, kMayInjectScripts, kNeverInjectsScripts }
	Describes a filter's relationship with scripts. More...

Detailed Description

Guarantees there is a head element in HTML. This enables downstream filters to assume that there will be a head.

Member Function Documentation

virtual void net_instaweb::AddHeadFilter::EndDocument ( )

virtual

Note: EndDocument will be called immediately before the last Flush call. (which also means that in the RewriteDriver use it is called before rendering for the last flush window).

Reimplemented from net_instaweb::EmptyHtmlFilter.

virtual void net_instaweb::AddHeadFilter::Flush ( )

virtual

Notifies the Filter that a flush is occurring. A filter that's generating streamed output should flush at this time. A filter that's mutating elements can mutate any element seen since the most recent flush; once an element is flushed it is already on the wire to its destination and it's too late to mutate. Flush is initiated by an application calling HttpParse::Flush().

Flush() is called after all other handlers during a HttpParse::Flush(), except RenderDone(), which (if in use) happens after Flush().

Reimplemented from net_instaweb::EmptyHtmlFilter.

virtual void net_instaweb::AddHeadFilter::StartDocument ( )

virtual

Starts a new document. Filters should clear their state in this function, as the same Filter instance may be used for multiple HTML documents.

Reimplemented from net_instaweb::EmptyHtmlFilter.

virtual void net_instaweb::AddHeadFilter::StartElement ( HtmlElement *  element )

virtual

When an HTML element is encountered during parsing, each filter's StartElement method is called. The HtmlElement lives for the entire duration of the document.

Todo:

TODO(jmarantz): consider passing handles rather than pointers and reference-counting them instead to save memory on long documents.

Reimplemented from net_instaweb::EmptyHtmlFilter.

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

• net/instaweb/rewriter/public/add_head_filter.h