parser/htmlparser/src/CParserContext.cpp
author Blake Kaplan <mrbkap@gmail.com>
Mon, 29 Sep 2008 21:19:43 -0700
changeset 19898 961d90be2ba80d1ecafb00edc027908beca1e733
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 19915 996d2802d3f2762122f9cb25a4b2302d2facbb8f
permissions -rw-r--r--
Bug 364315 - Speculatively look for URLs in the document while the parser waits for a script to download and execute. This should show a decent speedup, especially on mobile. Currently, this only finds other <script>s to preload, but hopefully we'll extend it to images and stylesheets as well. r+sr=jst

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#include "nsIAtom.h"
#include "CParserContext.h"
#include "nsToken.h"
#include "prenv.h"  
#include "nsIHTMLContentSink.h"
#include "nsHTMLTokenizer.h"

CParserContext::CParserContext(nsScanner* aScanner, 
                               void *aKey, 
                               eParserCommands aCommand,
                               nsIRequestObserver* aListener, 
                               nsIDTD *aDTD, 
                               eAutoDetectResult aStatus, 
                               PRBool aCopyUnused)
  : mDTD(aDTD),
    mListener(aListener),
    mKey(aKey),
    mPrevContext(nsnull),
    mScanner(aScanner),
    mDTDMode(eDTDMode_unknown),
    mStreamListenerState(eNone),
    mContextType(eCTNone),
    mAutoDetectStatus(aStatus),
    mParserCommand(aCommand),
    mMultipart(PR_TRUE),
    mCopyUnused(aCopyUnused),
    mNumConsumed(0)
{ 
  MOZ_COUNT_CTOR(CParserContext); 
} 

CParserContext::~CParserContext()
{
  // It's ok to simply ingore the PrevContext.
  MOZ_COUNT_DTOR(CParserContext);
}

void
CParserContext::SetMimeType(const nsACString& aMimeType)
{
  mMimeType.Assign(aMimeType);

  mDocType = ePlainText;

  if (mMimeType.EqualsLiteral(kHTMLTextContentType))
    mDocType = eHTML_Strict;
  else if (mMimeType.EqualsLiteral(kXMLTextContentType)          ||
           mMimeType.EqualsLiteral(kXMLApplicationContentType)   ||
           mMimeType.EqualsLiteral(kXHTMLApplicationContentType) ||
           mMimeType.EqualsLiteral(kXULTextContentType)          ||
#ifdef MOZ_SVG
           mMimeType.EqualsLiteral(kSVGTextContentType)          ||
#endif
           mMimeType.EqualsLiteral(kRDFApplicationContentType)   ||
           mMimeType.EqualsLiteral(kRDFTextContentType))
    mDocType = eXML;
}

nsresult
CParserContext::GetTokenizer(PRInt32 aType,
                             nsIContentSink* aSink,
                             nsITokenizer*& aTokenizer)
{
  nsresult result = NS_OK;
  
  if (!mTokenizer) {
    if (aType == NS_IPARSER_FLAG_HTML || mParserCommand == eViewSource) {
      nsCOMPtr<nsIHTMLContentSink> theSink = do_QueryInterface(aSink);
      PRUint16 theFlags = 0;

      if (theSink) {
        // XXX This code is repeated both here and in CNavDTD. Can the two
        // callsites be combined?
        PRBool enabled;
        theSink->IsEnabled(eHTMLTag_frameset, &enabled);
        if(enabled) {
          theFlags |= NS_IPARSER_FLAG_FRAMES_ENABLED;
        }
        
        theSink->IsEnabled(eHTMLTag_script, &enabled);
        if(enabled) {
          theFlags |= NS_IPARSER_FLAG_SCRIPT_ENABLED;
        }
      }

      mTokenizer = new nsHTMLTokenizer(mDTDMode, mDocType,
                                       mParserCommand, theFlags);
      if (!mTokenizer) {
        return NS_ERROR_OUT_OF_MEMORY;
      }

      // Make sure the new tokenizer has all of the necessary information.
      // XXX this might not be necessary.
      if (mPrevContext) {
        mTokenizer->CopyState(mPrevContext->mTokenizer);
      }
    }
    else if (aType == NS_IPARSER_FLAG_XML) {
      mTokenizer = do_QueryInterface(mDTD, &result);
    }
  }
  
  aTokenizer = mTokenizer;

  return result;
}