Page Speed Optimization Libraries  1.12.34.1
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net_instaweb::MetaTagFilter Class Reference

#include "meta_tag_filter.h"

Inheritance diagram for net_instaweb::MetaTagFilter:
net_instaweb::CommonFilter net_instaweb::EmptyHtmlFilter net_instaweb::HtmlFilter

Public Member Functions

 MetaTagFilter (RewriteDriver *rewrite_driver)
 
virtual void StartDocumentImpl ()
 
virtual void StartElementImpl (HtmlElement *element)
 
virtual void EndElementImpl (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::CommonFilter
 CommonFilter (RewriteDriver *driver)
 
const GoogleUrlbase_url () const
 Getters. More...
 
const GoogleUrldecoded_base_url () const
 
RewriteDriverdriver () const
 
HtmlElementnoscript_element () const
 
void InsertNodeAtBodyEnd (HtmlNode *data)
 
virtual void StartDocument ()
 Note: Don't overload these methods, overload the implementers instead!
 
virtual void StartElement (HtmlElement *element)
 
virtual void EndElement (HtmlElement *element)
 
virtual void Characters (HtmlCharactersNode *characters)
 
ResourcePtr CreateInputResource (StringPiece input_url, bool *is_authorized)
 
ResourcePtr CreateInputResourceOrInsertDebugComment (StringPiece input_url, HtmlElement *element)
 
void ResolveUrl (StringPiece input_url, GoogleUrl *out_url)
 
bool BaseUrlIsValid () const
 
bool DebugMode () const
 
bool CanAddPagespeedOnloadToImage (const HtmlElement &)
 
virtual void LogFilterModifiedContent ()
 
virtual
RewriteDriver::InlineAuthorizationPolicy 
AllowUnauthorizedDomain () const
 
virtual bool IntendedForInlining () const
 
void AddJsToElement (StringPiece js, HtmlElement *script)
 
- 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 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)
 

Static Public Member Functions

static void InitStats (Statistics *stats)
 
static bool ExtractAndUpdateMetaTagDetails (HtmlElement *element, ResponseHeaders *response_headers)
 
- Static Public Member Functions inherited from net_instaweb::CommonFilter
static bool ExtractMetaTagDetails (const HtmlElement &element, const ResponseHeaders *headers, GoogleString *content, GoogleString *mime_type, GoogleString *charset)
 

Additional Inherited Members

- Public Types inherited from net_instaweb::HtmlFilter
enum  ScriptUsage { kWillInjectScripts, kMayInjectScripts, kNeverInjectsScripts }
 Describes a filter's relationship with scripts. More...
 
- Static Public Attributes inherited from net_instaweb::CommonFilter
static const char kCreateResourceFailedDebugMsg []
 Debug message to be inserted when resource creation fails.
 
- Protected Member Functions inherited from net_instaweb::CommonFilter
ServerContextserver_context () const
 
const RewriteOptionsrewrite_options ()
 
virtual const char * LoggingId ()
 

Detailed Description

This class is the implementation of convert_meta_tags filter, which removes meta tags from the html and replaces them with a corresponding response header.

Member Function Documentation

virtual void net_instaweb::MetaTagFilter::EndElementImpl ( HtmlElement element)
virtual

Rewrite tags in the following form: <meta http-equiv="Content-Type" content="text/html"> into response headers. In theory we could delete the tag, but since it is somewhat "dangerous" to mutate the html (in case a script is looking for something), we leave the tag in there. As long as the tags and the headers match, there should not be a performance hit.

Implements net_instaweb::CommonFilter.

static bool net_instaweb::MetaTagFilter::ExtractAndUpdateMetaTagDetails ( HtmlElement element,
ResponseHeaders response_headers 
)
static

Utility function to extract the mime type and/or charset from a meta tag and update the response_headers if they are not set already.

virtual void net_instaweb::MetaTagFilter::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::MetaTagFilter::StartDocumentImpl ( )
virtual

Overload these implementer methods: Intentionally left abstract so that implementers don't forget to change the name from Blah to BlahImpl.

Implements net_instaweb::CommonFilter.


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