net_instaweb::CollapseWhitespaceFilter Class Reference

#include "collapse_whitespace_filter.h"

Inheritance diagram for net_instaweb::CollapseWhitespaceFilter:

Public Member Functions
	CollapseWhitespaceFilter (HtmlParse *html_parse)
virtual void	StartDocument ()
virtual void	StartElement (HtmlElement *element)
virtual void	EndElement (HtmlElement *element)
virtual void	Characters (HtmlCharactersNode *characters)
	Called for raw characters between tags.
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	EndDocument ()
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	Directive (HtmlDirectiveNode *directive)
	Called for HTML directives (e.g. <!doctype foobar>).
virtual void	Flush ()
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

Reduce the size of the HTML by collapsing whitespace (except within certain tags, e.g.

 and <script>).  Note that this is a dangerous filter, as
CSS can be used to make the HTML whitespace-sensitive in unpredictable
places; thus, it should only be used for content that you are sure will not
do this.

Todo:
TODO(mdsteele): Use the CSS parser (once it's finished) to try to
intelligently determine when the CSS "white-space: pre" property is in use;
that would make this filter much safer.  

Member Function Documentation

virtual void net_instaweb::CollapseWhitespaceFilter::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::CollapseWhitespaceFilter::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:

• pagespeed/kernel/html/collapse_whitespace_filter.h