Convert HTML parser to handle 8-bit resources without converting to UChar*

https://bugs.webkit.org/show_bug.cgi?id=90321

Reviewed by Adam Barth.

Source/WebCore: 

No new tests, no new functionality therefore covered by existing tests.

Changed the parsing of HTML to handle 8-bit strings without converting the 
whole string to 16-bits.  Primary change was to use the appropriate 
character pointer type (LChar* or UChar*) depending on the source string.
This access is abstracted in SegmentedSubstring by getCurrentChar{8,16} and
incrementAndGetCurrentChar{8,16} methods.  In SegmentedString, the advance()
and advanceAndUpdateLineNumber() methods have been refactored into a
state machine managed pair of function pointers.  The possible functions
have not only the 8 and 16 bitness factored out, they also have the 
"exclude line numbers" logic factored out for advanceAndUpdateLineNumber().
This change also has improvements over http://trac.webkit.org/changeset/123679.
The most prominent change was to inline the 8 bit paths for both advance()
and advanceAndUpdateLineNumber().
This provides a net speed-up even with the 8/16 bit testing.
Other changes involve using String methods to access and compare with the
source data.

* html/FTPDirectoryDocument.cpp:
(WebCore::FTPDirectoryDocumentParser::append): Changed to use currentChar()
instead of SegmentedString '*' operator.
* html/parser/HTMLEntityParser.cpp: Changed to use currentChar() instead of
SegmentedString '*' operator.
* html/parser/HTMLParserIdioms.cpp:
(WebCore::stripLeadingAndTrailingHTMLSpaces): Added 8-bit fast path.
* html/parser/HTMLSourceTracker.cpp:
(WebCore::HTMLSourceTracker::sourceForToken): Changed to use currentChar() instead of
SegmentedString '*' operator.
* loader/cache/CachedScript.cpp:
(WebCore::CachedScript::script): Updated to use new String::dataSize() method.
* platform/text/SegmentedString.cpp:
(WebCore::SegmentedString::SegmentedString):
(WebCore::SegmentedString::operator=):
(WebCore::SegmentedString::clear):
(WebCore::SegmentedString::append):
(WebCore::SegmentedString::prepend):
(WebCore::SegmentedString::advanceSubstring):
(WebCore::SegmentedString::advance):
(WebCore::SegmentedString::advance8): Fast path advance function for 8 bit data.
(WebCore::SegmentedString::advance16): Fast path advance function for 16 bit data.
(WebCore::SegmentedString::advanceAndUpdateLineNumber8): Fast path
advanceAndUpdateLineNumber for 8 bit data when we need to update the line number.
(WebCore::SegmentedString::advanceAndUpdateLineNumber16): Fast path
advanceAndUpdateLineNumber for 16 bit data when we need to update the line number.
(WebCore::SegmentedString::advanceSlowCase): Slow case advance function for both
8 and 16 bit advance.
(WebCore::SegmentedString::advanceAndUpdateLineNumberSlowCase): Slow case
advanceAndUpdateLineNumber function for both 8 and 16 bit data.
(WebCore::SegmentedString::advanceEmpty): Advance function when input has been exhausted.
(WebCore::SegmentedString::updateSlowCaseFunctionPointers): Set advance function
pointers to slow case functions.
* platform/text/SegmentedString.h:
(WebCore::SegmentedSubstring::SegmentedSubstring):
(WebCore::SegmentedSubstring::clear):
(SegmentedSubstring):
(WebCore::SegmentedSubstring::is8Bit): New getter.
(WebCore::SegmentedSubstring::appendTo):
(WebCore::SegmentedSubstring::getCurrentChar8): New getter for the 8 bit case.
(WebCore::SegmentedSubstring::getCurrentChar16): New getter for the 16 bit case.
(WebCore::SegmentedSubstring::incrementAndGetCurrentChar8): New wrapper functions
that pre-increments the 8 bit pointer and returns the next character.
(WebCore::SegmentedSubstring::incrementAndGetCurrentChar16): New wrapper functions
that pre-increments the 16 bit pointer and returns the next character.
(WebCore::SegmentedSubstring::currentSubString):
(WebCore::SegmentedSubstring::getCurrentChar):
(WebCore::SegmentedSubstring::incrementAndGetCurrentChar):
(WebCore::SegmentedString::SegmentedString):
(WebCore::SegmentedString::push):
(WebCore::SegmentedString::isEmpty):
(WebCore::SegmentedString::lookAhead):
(WebCore::SegmentedString::lookAheadIgnoringCase):
(WebCore::SegmentedString::advance): Wrapper that contains 8 bit fast path
or calls via member function point to approriate advance() flavor.
(WebCore::SegmentedString::advanceAndUpdateLineNumber): Wrapper that
contains 8 bit fast path or calls via member function point to approriate
advance() flavor.
(WebCore::SegmentedString::advanceAndASSERT):
(WebCore::SegmentedString::advanceAndASSERTIgnoringCase):
(WebCore::SegmentedString::advancePastNonNewline):
(WebCore::SegmentedString::advancePastNewlineAndUpdateLineNumber):
(WebCore::SegmentedString::currentChar):
(WebCore::SegmentedString::decrementAndCheckLength): Decrement substring length and
change to slow case functions when only one character left.
(WebCore::SegmentedString::updateAdvanceFunctionPointers): Select appropriate
advance functions based on current substring.
(WebCore::SegmentedString::lookAheadInline): Changed to use String::startsWith().
(WebCore::SegmentedString::lookAheadSlowCase):
* xml/parser/CharacterReferenceParserInlineMethods.h:
(WebCore::consumeCharacterReference): Changed to use currentChar() instead of
SegmentedString '*' operator.
* xml/parser/MarkupTokenizerBase.h:
(WebCore::MarkupTokenizerBase::InputStreamPreprocessor::nextInputCharacter):
(WebCore::MarkupTokenizerBase::InputStreamPreprocessor::peek): Changed to use
currentChar() instead of SegmentedString '*' operator.
(WebCore::MarkupTokenizerBase::InputStreamPreprocessor::advance):

Source/WTF: 

* wtf/text/WTFString.h:
(WTF::String::dataSize): New method to return the number of bytes 
the string requires.  This replaces a harcoded calculation based on
length and sizeof(UChar).


git-svn-id: svn://svn.chromium.org/blink/trunk@124679 bbb929c8-8fbe-4397-9dbb-9b2b20218538

0 files changed, 0 insertions, 0 deletions