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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      5  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  *
     22  */
     23 
     24 #include "config.h"
     25 #include "HTMLElement.h"
     26 
     27 #include "Attribute.h"
     28 #include "CSSPropertyNames.h"
     29 #include "CSSValueKeywords.h"
     30 #include "DocumentFragment.h"
     31 #include "Event.h"
     32 #include "EventListener.h"
     33 #include "EventNames.h"
     34 #include "ExceptionCode.h"
     35 #include "Frame.h"
     36 #include "HTMLBRElement.h"
     37 #include "HTMLCollection.h"
     38 #include "HTMLDocument.h"
     39 #include "HTMLElementFactory.h"
     40 #include "HTMLFormElement.h"
     41 #include "HTMLNames.h"
     42 #include "HTMLParserIdioms.h"
     43 #include "RenderWordBreak.h"
     44 #include "ScriptEventListener.h"
     45 #include "Settings.h"
     46 #include "Text.h"
     47 #include "TextIterator.h"
     48 #include "markup.h"
     49 #include <wtf/StdLibExtras.h>
     50 #include <wtf/text/CString.h>
     51 
     52 namespace WebCore {
     53 
     54 using namespace HTMLNames;
     55 
     56 using std::min;
     57 using std::max;
     58 
     59 PassRefPtr<HTMLElement> HTMLElement::create(const QualifiedName& tagName, Document* document)
     60 {
     61     return adoptRef(new HTMLElement(tagName, document));
     62 }
     63 
     64 String HTMLElement::nodeName() const
     65 {
     66     // FIXME: Would be nice to have an atomicstring lookup based off uppercase
     67     // chars that does not have to copy the string on a hit in the hash.
     68     // FIXME: We should have a way to detect XHTML elements and replace the hasPrefix() check with it.
     69     if (document()->isHTMLDocument() && !tagQName().hasPrefix())
     70         return tagQName().localNameUpper();
     71     return Element::nodeName();
     72 }
     73 
     74 bool HTMLElement::ieForbidsInsertHTML() const
     75 {
     76     // FIXME: Supposedly IE disallows settting innerHTML, outerHTML
     77     // and createContextualFragment on these tags.  We have no tests to
     78     // verify this however, so this list could be totally wrong.
     79     // This list was moved from the previous endTagRequirement() implementation.
     80     // This is also called from editing and assumed to be the list of tags
     81     // for which no end tag should be serialized. It's unclear if the list for
     82     // IE compat and the list for serialization sanity are the same.
     83     if (hasLocalName(areaTag)
     84         || hasLocalName(baseTag)
     85         || hasLocalName(basefontTag)
     86         || hasLocalName(brTag)
     87         || hasLocalName(colTag)
     88 #if ENABLE(DATAGRID)
     89         || hasLocalName(dcellTag)
     90         || hasLocalName(dcolTag)
     91 #endif
     92         || hasLocalName(embedTag)
     93         || hasLocalName(frameTag)
     94         || hasLocalName(hrTag)
     95         || hasLocalName(imageTag)
     96         || hasLocalName(imgTag)
     97         || hasLocalName(inputTag)
     98         || hasLocalName(isindexTag)
     99         || hasLocalName(linkTag)
    100         || hasLocalName(metaTag)
    101         || hasLocalName(paramTag)
    102         || hasLocalName(sourceTag)
    103         || hasLocalName(wbrTag))
    104         return true;
    105     // FIXME: I'm not sure why dashboard mode would want to change the
    106     // serialization of <canvas>, that seems like a bad idea.
    107 #if ENABLE(DASHBOARD_SUPPORT)
    108     if (hasLocalName(canvasTag)) {
    109         Settings* settings = document()->settings();
    110         if (settings && settings->usesDashboardBackwardCompatibilityMode())
    111             return true;
    112     }
    113 #endif
    114     return false;
    115 }
    116 
    117 bool HTMLElement::mapToEntry(const QualifiedName& attrName, MappedAttributeEntry& result) const
    118 {
    119     if (attrName == alignAttr
    120         || attrName == contenteditableAttr
    121         || attrName == hiddenAttr) {
    122         result = eUniversal;
    123         return false;
    124     }
    125     if (attrName == dirAttr) {
    126         result = hasLocalName(bdoTag) ? eBDO : eUniversal;
    127         return true;
    128     }
    129 
    130     return StyledElement::mapToEntry(attrName, result);
    131 }
    132 
    133 void HTMLElement::parseMappedAttribute(Attribute* attr)
    134 {
    135     if (isIdAttributeName(attr->name()) || attr->name() == classAttr || attr->name() == styleAttr)
    136         return StyledElement::parseMappedAttribute(attr);
    137 
    138     String indexstring;
    139     if (attr->name() == alignAttr) {
    140         if (equalIgnoringCase(attr->value(), "middle"))
    141             addCSSProperty(attr, CSSPropertyTextAlign, "center");
    142         else
    143             addCSSProperty(attr, CSSPropertyTextAlign, attr->value());
    144     } else if (attr->name() == contenteditableAttr) {
    145         setContentEditable(attr);
    146     } else if (attr->name() == hiddenAttr) {
    147         addCSSProperty(attr, CSSPropertyDisplay, CSSValueNone);
    148     } else if (attr->name() == tabindexAttr) {
    149         indexstring = getAttribute(tabindexAttr);
    150         int tabindex = 0;
    151         if (!indexstring.length()) {
    152             clearTabIndexExplicitly();
    153         } else if (parseHTMLInteger(indexstring, tabindex)) {
    154             // Clamp tabindex to the range of 'short' to match Firefox's behavior.
    155             setTabIndexExplicitly(max(static_cast<int>(std::numeric_limits<short>::min()), min(tabindex, static_cast<int>(std::numeric_limits<short>::max()))));
    156         }
    157     } else if (attr->name() == langAttr) {
    158         // FIXME: Implement
    159     } else if (attr->name() == dirAttr) {
    160         if (!equalIgnoringCase(attr->value(), "auto"))
    161             addCSSProperty(attr, CSSPropertyDirection, attr->value());
    162         dirAttributeChanged(attr);
    163         addCSSProperty(attr, CSSPropertyUnicodeBidi, hasLocalName(bdoTag) ? CSSValueBidiOverride : CSSValueEmbed);
    164     } else if (attr->name() == draggableAttr) {
    165         const AtomicString& value = attr->value();
    166         if (equalIgnoringCase(value, "true")) {
    167             addCSSProperty(attr, CSSPropertyWebkitUserDrag, CSSValueElement);
    168             addCSSProperty(attr, CSSPropertyWebkitUserSelect, CSSValueNone);
    169         } else if (equalIgnoringCase(value, "false"))
    170             addCSSProperty(attr, CSSPropertyWebkitUserDrag, CSSValueNone);
    171     }
    172 // standard events
    173     else if (attr->name() == onclickAttr) {
    174         setAttributeEventListener(eventNames().clickEvent, createAttributeEventListener(this, attr));
    175     } else if (attr->name() == oncontextmenuAttr) {
    176         setAttributeEventListener(eventNames().contextmenuEvent, createAttributeEventListener(this, attr));
    177     } else if (attr->name() == ondblclickAttr) {
    178         setAttributeEventListener(eventNames().dblclickEvent, createAttributeEventListener(this, attr));
    179     } else if (attr->name() == onmousedownAttr) {
    180         setAttributeEventListener(eventNames().mousedownEvent, createAttributeEventListener(this, attr));
    181     } else if (attr->name() == onmousemoveAttr) {
    182         setAttributeEventListener(eventNames().mousemoveEvent, createAttributeEventListener(this, attr));
    183     } else if (attr->name() == onmouseoutAttr) {
    184         setAttributeEventListener(eventNames().mouseoutEvent, createAttributeEventListener(this, attr));
    185     } else if (attr->name() == onmouseoverAttr) {
    186         setAttributeEventListener(eventNames().mouseoverEvent, createAttributeEventListener(this, attr));
    187     } else if (attr->name() == onmouseupAttr) {
    188         setAttributeEventListener(eventNames().mouseupEvent, createAttributeEventListener(this, attr));
    189     } else if (attr->name() == onmousewheelAttr) {
    190         setAttributeEventListener(eventNames().mousewheelEvent, createAttributeEventListener(this, attr));
    191     } else if (attr->name() == onfocusAttr) {
    192         setAttributeEventListener(eventNames().focusEvent, createAttributeEventListener(this, attr));
    193     } else if (attr->name() == onfocusinAttr) {
    194         setAttributeEventListener(eventNames().focusinEvent, createAttributeEventListener(this, attr));
    195     } else if (attr->name() == onfocusoutAttr) {
    196         setAttributeEventListener(eventNames().focusoutEvent, createAttributeEventListener(this, attr));
    197     } else if (attr->name() == onblurAttr) {
    198         setAttributeEventListener(eventNames().blurEvent, createAttributeEventListener(this, attr));
    199     } else if (attr->name() == onkeydownAttr) {
    200         setAttributeEventListener(eventNames().keydownEvent, createAttributeEventListener(this, attr));
    201     } else if (attr->name() == onkeypressAttr) {
    202         setAttributeEventListener(eventNames().keypressEvent, createAttributeEventListener(this, attr));
    203     } else if (attr->name() == onkeyupAttr) {
    204         setAttributeEventListener(eventNames().keyupEvent, createAttributeEventListener(this, attr));
    205     } else if (attr->name() == onscrollAttr) {
    206         setAttributeEventListener(eventNames().scrollEvent, createAttributeEventListener(this, attr));
    207     } else if (attr->name() == onbeforecutAttr) {
    208         setAttributeEventListener(eventNames().beforecutEvent, createAttributeEventListener(this, attr));
    209     } else if (attr->name() == oncutAttr) {
    210         setAttributeEventListener(eventNames().cutEvent, createAttributeEventListener(this, attr));
    211     } else if (attr->name() == onbeforecopyAttr) {
    212         setAttributeEventListener(eventNames().beforecopyEvent, createAttributeEventListener(this, attr));
    213     } else if (attr->name() == oncopyAttr) {
    214         setAttributeEventListener(eventNames().copyEvent, createAttributeEventListener(this, attr));
    215     } else if (attr->name() == onbeforepasteAttr) {
    216         setAttributeEventListener(eventNames().beforepasteEvent, createAttributeEventListener(this, attr));
    217     } else if (attr->name() == onpasteAttr) {
    218         setAttributeEventListener(eventNames().pasteEvent, createAttributeEventListener(this, attr));
    219     } else if (attr->name() == ondragenterAttr) {
    220         setAttributeEventListener(eventNames().dragenterEvent, createAttributeEventListener(this, attr));
    221     } else if (attr->name() == ondragoverAttr) {
    222         setAttributeEventListener(eventNames().dragoverEvent, createAttributeEventListener(this, attr));
    223     } else if (attr->name() == ondragleaveAttr) {
    224         setAttributeEventListener(eventNames().dragleaveEvent, createAttributeEventListener(this, attr));
    225     } else if (attr->name() == ondropAttr) {
    226         setAttributeEventListener(eventNames().dropEvent, createAttributeEventListener(this, attr));
    227     } else if (attr->name() == ondragstartAttr) {
    228         setAttributeEventListener(eventNames().dragstartEvent, createAttributeEventListener(this, attr));
    229     } else if (attr->name() == ondragAttr) {
    230         setAttributeEventListener(eventNames().dragEvent, createAttributeEventListener(this, attr));
    231     } else if (attr->name() == ondragendAttr) {
    232         setAttributeEventListener(eventNames().dragendEvent, createAttributeEventListener(this, attr));
    233     } else if (attr->name() == onselectstartAttr) {
    234         setAttributeEventListener(eventNames().selectstartEvent, createAttributeEventListener(this, attr));
    235     } else if (attr->name() == onsubmitAttr) {
    236         setAttributeEventListener(eventNames().submitEvent, createAttributeEventListener(this, attr));
    237     } else if (attr->name() == onerrorAttr) {
    238         setAttributeEventListener(eventNames().errorEvent, createAttributeEventListener(this, attr));
    239     } else if (attr->name() == onwebkitanimationstartAttr) {
    240         setAttributeEventListener(eventNames().webkitAnimationStartEvent, createAttributeEventListener(this, attr));
    241     } else if (attr->name() == onwebkitanimationiterationAttr) {
    242         setAttributeEventListener(eventNames().webkitAnimationIterationEvent, createAttributeEventListener(this, attr));
    243     } else if (attr->name() == onwebkitanimationendAttr) {
    244         setAttributeEventListener(eventNames().webkitAnimationEndEvent, createAttributeEventListener(this, attr));
    245     } else if (attr->name() == onwebkittransitionendAttr) {
    246         setAttributeEventListener(eventNames().webkitTransitionEndEvent, createAttributeEventListener(this, attr));
    247     } else if (attr->name() == oninputAttr) {
    248         setAttributeEventListener(eventNames().inputEvent, createAttributeEventListener(this, attr));
    249     } else if (attr->name() == oninvalidAttr) {
    250         setAttributeEventListener(eventNames().invalidEvent, createAttributeEventListener(this, attr));
    251     } else if (attr->name() == ontouchstartAttr) {
    252         setAttributeEventListener(eventNames().touchstartEvent, createAttributeEventListener(this, attr));
    253     } else if (attr->name() == ontouchmoveAttr) {
    254         setAttributeEventListener(eventNames().touchmoveEvent, createAttributeEventListener(this, attr));
    255     } else if (attr->name() == ontouchendAttr) {
    256         setAttributeEventListener(eventNames().touchendEvent, createAttributeEventListener(this, attr));
    257     } else if (attr->name() == ontouchcancelAttr) {
    258         setAttributeEventListener(eventNames().touchcancelEvent, createAttributeEventListener(this, attr));
    259 #if ENABLE(FULLSCREEN_API)
    260     } else if (attr->name() == onwebkitfullscreenchangeAttr) {
    261         setAttributeEventListener(eventNames().webkitfullscreenchangeEvent, createAttributeEventListener(this, attr));
    262 #endif
    263     }
    264 }
    265 
    266 String HTMLElement::innerHTML() const
    267 {
    268     return createMarkup(this, ChildrenOnly);
    269 }
    270 
    271 String HTMLElement::outerHTML() const
    272 {
    273     return createMarkup(this);
    274 }
    275 
    276 // FIXME: This logic should move into Range::createContextualFragment
    277 PassRefPtr<DocumentFragment> HTMLElement::deprecatedCreateContextualFragment(const String& markup, FragmentScriptingPermission scriptingPermission)
    278 {
    279     // The following is in accordance with the definition as used by IE.
    280     if (ieForbidsInsertHTML())
    281         return 0;
    282 
    283     if (hasLocalName(colTag) || hasLocalName(colgroupTag) || hasLocalName(framesetTag)
    284         || hasLocalName(headTag) || hasLocalName(styleTag) || hasLocalName(titleTag))
    285         return 0;
    286 
    287     return Element::deprecatedCreateContextualFragment(markup, scriptingPermission);
    288 }
    289 
    290 static inline bool hasOneChild(ContainerNode* node)
    291 {
    292     Node* firstChild = node->firstChild();
    293     return firstChild && !firstChild->nextSibling();
    294 }
    295 
    296 static inline bool hasOneTextChild(ContainerNode* node)
    297 {
    298     return hasOneChild(node) && node->firstChild()->isTextNode();
    299 }
    300 
    301 static void replaceChildrenWithFragment(HTMLElement* element, PassRefPtr<DocumentFragment> fragment, ExceptionCode& ec)
    302 {
    303     if (!fragment->firstChild()) {
    304         element->removeChildren();
    305         return;
    306     }
    307 
    308     if (hasOneTextChild(element) && hasOneTextChild(fragment.get())) {
    309         static_cast<Text*>(element->firstChild())->setData(static_cast<Text*>(fragment->firstChild())->data(), ec);
    310         return;
    311     }
    312 
    313     if (hasOneChild(element)) {
    314         element->replaceChild(fragment, element->firstChild(), ec);
    315         return;
    316     }
    317 
    318     element->removeChildren();
    319     element->appendChild(fragment, ec);
    320 }
    321 
    322 static void replaceChildrenWithText(HTMLElement* element, const String& text, ExceptionCode& ec)
    323 {
    324     if (hasOneTextChild(element)) {
    325         static_cast<Text*>(element->firstChild())->setData(text, ec);
    326         return;
    327     }
    328 
    329     RefPtr<Text> textNode = Text::create(element->document(), text);
    330 
    331     if (hasOneChild(element)) {
    332         element->replaceChild(textNode.release(), element->firstChild(), ec);
    333         return;
    334     }
    335 
    336     element->removeChildren();
    337     element->appendChild(textNode.release(), ec);
    338 }
    339 
    340 // We may want to move a version of this function into DocumentFragment.h/cpp
    341 static PassRefPtr<DocumentFragment> createFragmentFromSource(const String& markup, Element* contextElement, ExceptionCode& ec)
    342 {
    343     Document* document = contextElement->document();
    344     RefPtr<DocumentFragment> fragment;
    345 
    346     fragment = DocumentFragment::create(document);
    347     if (document->isHTMLDocument()) {
    348         fragment->parseHTML(markup, contextElement);
    349         return fragment;
    350     }
    351 
    352     bool wasValid = fragment->parseXML(markup, contextElement);
    353     if (!wasValid) {
    354         ec = INVALID_STATE_ERR;
    355         return 0;
    356     }
    357     return fragment;
    358 }
    359 
    360 void HTMLElement::setInnerHTML(const String& html, ExceptionCode& ec)
    361 {
    362     RefPtr<DocumentFragment> fragment = createFragmentFromSource(html, this, ec);
    363     if (fragment)
    364         replaceChildrenWithFragment(this, fragment.release(), ec);
    365 }
    366 
    367 void HTMLElement::setOuterHTML(const String& html, ExceptionCode& ec)
    368 {
    369     Node* p = parentNode();
    370     if (!p || !p->isHTMLElement()) {
    371         ec = NO_MODIFICATION_ALLOWED_ERR;
    372         return;
    373     }
    374     HTMLElement* parent = toHTMLElement(p);
    375 
    376     RefPtr<DocumentFragment> fragment = createFragmentFromSource(html, parent, ec);
    377     if (fragment) {
    378         // FIXME: Why doesn't this have code to merge neighboring text nodes the way setOuterText does?
    379         parent->replaceChild(fragment.release(), this, ec);
    380     }
    381 }
    382 
    383 PassRefPtr<DocumentFragment> HTMLElement::textToFragment(const String& text, ExceptionCode& ec)
    384 {
    385     RefPtr<DocumentFragment> fragment = DocumentFragment::create(document());
    386     unsigned int i, length = text.length();
    387     UChar c = 0;
    388     for (unsigned int start = 0; start < length; ) {
    389 
    390         // Find next line break.
    391         for (i = start; i < length; i++) {
    392           c = text[i];
    393           if (c == '\r' || c == '\n')
    394               break;
    395         }
    396 
    397         fragment->appendChild(Text::create(document(), text.substring(start, i - start)), ec);
    398         if (ec)
    399             return 0;
    400 
    401         if (c == '\r' || c == '\n') {
    402             fragment->appendChild(HTMLBRElement::create(document()), ec);
    403             if (ec)
    404                 return 0;
    405             // Make sure \r\n doesn't result in two line breaks.
    406             if (c == '\r' && i + 1 < length && text[i + 1] == '\n')
    407                 i++;
    408         }
    409 
    410         start = i + 1; // Character after line break.
    411     }
    412 
    413     return fragment;
    414 }
    415 
    416 void HTMLElement::setInnerText(const String& text, ExceptionCode& ec)
    417 {
    418     if (ieForbidsInsertHTML()) {
    419         ec = NO_MODIFICATION_ALLOWED_ERR;
    420         return;
    421     }
    422     if (hasLocalName(colTag) || hasLocalName(colgroupTag) || hasLocalName(framesetTag) ||
    423         hasLocalName(headTag) || hasLocalName(htmlTag) || hasLocalName(tableTag) ||
    424         hasLocalName(tbodyTag) || hasLocalName(tfootTag) || hasLocalName(theadTag) ||
    425         hasLocalName(trTag)) {
    426         ec = NO_MODIFICATION_ALLOWED_ERR;
    427         return;
    428     }
    429 
    430     // FIXME: This doesn't take whitespace collapsing into account at all.
    431 
    432     if (!text.contains('\n') && !text.contains('\r')) {
    433         if (text.isEmpty()) {
    434             removeChildren();
    435             return;
    436         }
    437         replaceChildrenWithText(this, text, ec);
    438         return;
    439     }
    440 
    441     // FIXME: Do we need to be able to detect preserveNewline style even when there's no renderer?
    442     // FIXME: Can the renderer be out of date here? Do we need to call updateStyleIfNeeded?
    443     // For example, for the contents of textarea elements that are display:none?
    444     RenderObject* r = renderer();
    445     if (r && r->style()->preserveNewline()) {
    446         if (!text.contains('\r')) {
    447             replaceChildrenWithText(this, text, ec);
    448             return;
    449         }
    450         String textWithConsistentLineBreaks = text;
    451         textWithConsistentLineBreaks.replace("\r\n", "\n");
    452         textWithConsistentLineBreaks.replace('\r', '\n');
    453         replaceChildrenWithText(this, textWithConsistentLineBreaks, ec);
    454         return;
    455     }
    456 
    457     // Add text nodes and <br> elements.
    458     ec = 0;
    459     RefPtr<DocumentFragment> fragment = textToFragment(text, ec);
    460     if (!ec)
    461         replaceChildrenWithFragment(this, fragment.release(), ec);
    462 }
    463 
    464 static void mergeWithNextTextNode(PassRefPtr<Node> node, ExceptionCode& ec)
    465 {
    466     ASSERT(node && node->isTextNode());
    467     Node* next = node->nextSibling();
    468     if (!next || !next->isTextNode())
    469         return;
    470 
    471     RefPtr<Text> textNode = static_cast<Text*>(node.get());
    472     RefPtr<Text> textNext = static_cast<Text*>(next);
    473     textNode->appendData(textNext->data(), ec);
    474     if (ec)
    475         return;
    476     if (textNext->parentNode()) // Might have been removed by mutation event.
    477         textNext->remove(ec);
    478 }
    479 
    480 void HTMLElement::setOuterText(const String &text, ExceptionCode& ec)
    481 {
    482     if (ieForbidsInsertHTML()) {
    483         ec = NO_MODIFICATION_ALLOWED_ERR;
    484         return;
    485     }
    486     if (hasLocalName(colTag) || hasLocalName(colgroupTag) || hasLocalName(framesetTag) ||
    487         hasLocalName(headTag) || hasLocalName(htmlTag) || hasLocalName(tableTag) ||
    488         hasLocalName(tbodyTag) || hasLocalName(tfootTag) || hasLocalName(theadTag) ||
    489         hasLocalName(trTag)) {
    490         ec = NO_MODIFICATION_ALLOWED_ERR;
    491         return;
    492     }
    493 
    494     ContainerNode* parent = parentNode();
    495     if (!parent) {
    496         ec = NO_MODIFICATION_ALLOWED_ERR;
    497         return;
    498     }
    499 
    500     RefPtr<Node> prev = previousSibling();
    501     RefPtr<Node> next = nextSibling();
    502     RefPtr<Node> newChild;
    503     ec = 0;
    504 
    505     // Convert text to fragment with <br> tags instead of linebreaks if needed.
    506     if (text.contains('\r') || text.contains('\n'))
    507         newChild = textToFragment(text, ec);
    508     else
    509         newChild = Text::create(document(), text);
    510 
    511     if (!this || !parentNode())
    512         ec = HIERARCHY_REQUEST_ERR;
    513     if (ec)
    514         return;
    515     parent->replaceChild(newChild.release(), this, ec);
    516 
    517     RefPtr<Node> node = next ? next->previousSibling() : 0;
    518     if (!ec && node && node->isTextNode())
    519         mergeWithNextTextNode(node.release(), ec);
    520 
    521     if (!ec && prev && prev->isTextNode())
    522         mergeWithNextTextNode(prev.release(), ec);
    523 }
    524 
    525 Node* HTMLElement::insertAdjacent(const String& where, Node* newChild, ExceptionCode& ec)
    526 {
    527     // In Internet Explorer if the element has no parent and where is "beforeBegin" or "afterEnd",
    528     // a document fragment is created and the elements appended in the correct order. This document
    529     // fragment isn't returned anywhere.
    530     //
    531     // This is impossible for us to implement as the DOM tree does not allow for such structures,
    532     // Opera also appears to disallow such usage.
    533 
    534     if (equalIgnoringCase(where, "beforeBegin")) {
    535         ContainerNode* parent = this->parentNode();
    536         return (parent && parent->insertBefore(newChild, this, ec)) ? newChild : 0;
    537     }
    538 
    539     if (equalIgnoringCase(where, "afterBegin"))
    540         return insertBefore(newChild, firstChild(), ec) ? newChild : 0;
    541 
    542     if (equalIgnoringCase(where, "beforeEnd"))
    543         return appendChild(newChild, ec) ? newChild : 0;
    544 
    545     if (equalIgnoringCase(where, "afterEnd")) {
    546         ContainerNode* parent = this->parentNode();
    547         return (parent && parent->insertBefore(newChild, nextSibling(), ec)) ? newChild : 0;
    548     }
    549 
    550     // IE throws COM Exception E_INVALIDARG; this is the best DOM exception alternative.
    551     ec = NOT_SUPPORTED_ERR;
    552     return 0;
    553 }
    554 
    555 Element* HTMLElement::insertAdjacentElement(const String& where, Element* newChild, ExceptionCode& ec)
    556 {
    557     if (!newChild) {
    558         // IE throws COM Exception E_INVALIDARG; this is the best DOM exception alternative.
    559         ec = TYPE_MISMATCH_ERR;
    560         return 0;
    561     }
    562 
    563     Node* returnValue = insertAdjacent(where, newChild, ec);
    564     ASSERT(!returnValue || returnValue->isElementNode());
    565     return static_cast<Element*>(returnValue);
    566 }
    567 
    568 // Step 3 of http://www.whatwg.org/specs/web-apps/current-work/multipage/apis-in-html-documents.html#insertadjacenthtml()
    569 static Element* contextElementForInsertion(const String& where, Element* element, ExceptionCode& ec)
    570 {
    571     if (equalIgnoringCase(where, "beforeBegin") || equalIgnoringCase(where, "afterEnd")) {
    572         ContainerNode* parent = element->parentNode();
    573         if (parent && !parent->isElementNode()) {
    574             ec = NO_MODIFICATION_ALLOWED_ERR;
    575             return 0;
    576         }
    577         ASSERT(!parent || parent->isElementNode());
    578         return static_cast<Element*>(parent);
    579     }
    580     if (equalIgnoringCase(where, "afterBegin") || equalIgnoringCase(where, "beforeEnd"))
    581         return element;
    582     ec =  SYNTAX_ERR;
    583     return 0;
    584 }
    585 
    586 void HTMLElement::insertAdjacentHTML(const String& where, const String& markup, ExceptionCode& ec)
    587 {
    588     RefPtr<DocumentFragment> fragment = document()->createDocumentFragment();
    589     Element* contextElement = contextElementForInsertion(where, this, ec);
    590     if (!contextElement)
    591         return;
    592 
    593     if (document()->isHTMLDocument())
    594          fragment->parseHTML(markup, contextElement);
    595     else {
    596         if (!fragment->parseXML(markup, contextElement))
    597             // FIXME: We should propagate a syntax error exception out here.
    598             return;
    599     }
    600 
    601     insertAdjacent(where, fragment.get(), ec);
    602 }
    603 
    604 void HTMLElement::insertAdjacentText(const String& where, const String& text, ExceptionCode& ec)
    605 {
    606     RefPtr<Text> textNode = document()->createTextNode(text);
    607     insertAdjacent(where, textNode.get(), ec);
    608 }
    609 
    610 void HTMLElement::addHTMLAlignment(Attribute* attr)
    611 {
    612     addHTMLAlignmentToStyledElement(this, attr);
    613 }
    614 
    615 void HTMLElement::addHTMLAlignmentToStyledElement(StyledElement* element, Attribute* attr)
    616 {
    617     // Vertical alignment with respect to the current baseline of the text
    618     // right or left means floating images.
    619     int floatValue = CSSValueInvalid;
    620     int verticalAlignValue = CSSValueInvalid;
    621 
    622     const AtomicString& alignment = attr->value();
    623     if (equalIgnoringCase(alignment, "absmiddle"))
    624         verticalAlignValue = CSSValueMiddle;
    625     else if (equalIgnoringCase(alignment, "absbottom"))
    626         verticalAlignValue = CSSValueBottom;
    627     else if (equalIgnoringCase(alignment, "left")) {
    628         floatValue = CSSValueLeft;
    629         verticalAlignValue = CSSValueTop;
    630     } else if (equalIgnoringCase(alignment, "right")) {
    631         floatValue = CSSValueRight;
    632         verticalAlignValue = CSSValueTop;
    633     } else if (equalIgnoringCase(alignment, "top"))
    634         verticalAlignValue = CSSValueTop;
    635     else if (equalIgnoringCase(alignment, "middle"))
    636         verticalAlignValue = CSSValueWebkitBaselineMiddle;
    637     else if (equalIgnoringCase(alignment, "center"))
    638         verticalAlignValue = CSSValueMiddle;
    639     else if (equalIgnoringCase(alignment, "bottom"))
    640         verticalAlignValue = CSSValueBaseline;
    641     else if (equalIgnoringCase(alignment, "texttop"))
    642         verticalAlignValue = CSSValueTextTop;
    643 
    644     if (floatValue != CSSValueInvalid)
    645         element->addCSSProperty(attr, CSSPropertyFloat, floatValue);
    646 
    647     if (verticalAlignValue != CSSValueInvalid)
    648         element->addCSSProperty(attr, CSSPropertyVerticalAlign, verticalAlignValue);
    649 }
    650 
    651 bool HTMLElement::supportsFocus() const
    652 {
    653     return Element::supportsFocus() || (rendererIsEditable() && parentNode() && !parentNode()->rendererIsEditable());
    654 }
    655 
    656 String HTMLElement::contentEditable() const
    657 {
    658     const AtomicString& value = fastGetAttribute(contenteditableAttr);
    659 
    660     if (value.isNull())
    661         return "inherit";
    662     if (value.isEmpty() || equalIgnoringCase(value, "true"))
    663         return "true";
    664     if (equalIgnoringCase(value, "false"))
    665          return "false";
    666     if (equalIgnoringCase(value, "plaintext-only"))
    667         return "plaintext-only";
    668 
    669     return "inherit";
    670 }
    671 
    672 void HTMLElement::setContentEditable(Attribute* attr)
    673 {
    674     const AtomicString& enabled = attr->value();
    675     if (enabled.isEmpty() || equalIgnoringCase(enabled, "true")) {
    676         addCSSProperty(attr, CSSPropertyWebkitUserModify, CSSValueReadWrite);
    677         addCSSProperty(attr, CSSPropertyWordWrap, CSSValueBreakWord);
    678         addCSSProperty(attr, CSSPropertyWebkitNbspMode, CSSValueSpace);
    679         addCSSProperty(attr, CSSPropertyWebkitLineBreak, CSSValueAfterWhiteSpace);
    680     } else if (equalIgnoringCase(enabled, "false")) {
    681         addCSSProperty(attr, CSSPropertyWebkitUserModify, CSSValueReadOnly);
    682         attr->decl()->removeProperty(CSSPropertyWordWrap, false);
    683         attr->decl()->removeProperty(CSSPropertyWebkitNbspMode, false);
    684         attr->decl()->removeProperty(CSSPropertyWebkitLineBreak, false);
    685     } else if (equalIgnoringCase(enabled, "plaintext-only")) {
    686         addCSSProperty(attr, CSSPropertyWebkitUserModify, CSSValueReadWritePlaintextOnly);
    687         addCSSProperty(attr, CSSPropertyWordWrap, CSSValueBreakWord);
    688         addCSSProperty(attr, CSSPropertyWebkitNbspMode, CSSValueSpace);
    689         addCSSProperty(attr, CSSPropertyWebkitLineBreak, CSSValueAfterWhiteSpace);
    690     }
    691 }
    692 
    693 void HTMLElement::setContentEditable(const String& enabled, ExceptionCode& ec)
    694 {
    695     if (equalIgnoringCase(enabled, "true"))
    696         setAttribute(contenteditableAttr, "true", ec);
    697     else if (equalIgnoringCase(enabled, "false"))
    698         setAttribute(contenteditableAttr, "false", ec);
    699     else if (equalIgnoringCase(enabled, "plaintext-only"))
    700         setAttribute(contenteditableAttr, "plaintext-only");
    701     else if (equalIgnoringCase(enabled, "inherit"))
    702         removeAttribute(contenteditableAttr, ec);
    703     else
    704         ec = SYNTAX_ERR;
    705 }
    706 
    707 bool HTMLElement::draggable() const
    708 {
    709     return equalIgnoringCase(getAttribute(draggableAttr), "true");
    710 }
    711 
    712 void HTMLElement::setDraggable(bool value)
    713 {
    714     setAttribute(draggableAttr, value ? "true" : "false");
    715 }
    716 
    717 bool HTMLElement::spellcheck() const
    718 {
    719     return isSpellCheckingEnabled();
    720 }
    721 
    722 void HTMLElement::setSpellcheck(bool enable)
    723 {
    724     setAttribute(spellcheckAttr, enable ? "true" : "false");
    725 }
    726 
    727 
    728 void HTMLElement::click()
    729 {
    730     dispatchSimulatedClick(0, false, false);
    731 }
    732 
    733 // accessKeyAction is used by the accessibility support code
    734 // to send events to elements that our JavaScript caller does
    735 // does not.  The elements JS is interested in have subclasses
    736 // that override this method to direct the click appropriately.
    737 // Here in the base class, then, we only send the click if
    738 // the caller wants it to go to any HTMLElement, and we say
    739 // to send the mouse events in addition to the click.
    740 void HTMLElement::accessKeyAction(bool sendToAnyElement)
    741 {
    742     if (sendToAnyElement)
    743         dispatchSimulatedClick(0, true);
    744 }
    745 
    746 String HTMLElement::title() const
    747 {
    748     return getAttribute(titleAttr);
    749 }
    750 
    751 short HTMLElement::tabIndex() const
    752 {
    753     if (supportsFocus())
    754         return Element::tabIndex();
    755     return -1;
    756 }
    757 
    758 void HTMLElement::setTabIndex(int value)
    759 {
    760     setAttribute(tabindexAttr, String::number(value));
    761 }
    762 
    763 PassRefPtr<HTMLCollection> HTMLElement::children()
    764 {
    765     return HTMLCollection::create(this, NodeChildren);
    766 }
    767 
    768 bool HTMLElement::rendererIsNeeded(RenderStyle *style)
    769 {
    770     if (hasLocalName(noscriptTag)) {
    771         Frame* frame = document()->frame();
    772 #if ENABLE(XHTMLMP)
    773         if (!document()->shouldProcessNoscriptElement())
    774             return false;
    775 #else
    776         if (frame && frame->script()->canExecuteScripts(NotAboutToExecuteScript))
    777             return false;
    778 #endif
    779     } else if (hasLocalName(noembedTag)) {
    780         Frame* frame = document()->frame();
    781         if (frame && frame->loader()->subframeLoader()->allowPlugins(NotAboutToInstantiatePlugin))
    782             return false;
    783     }
    784     return StyledElement::rendererIsNeeded(style);
    785 }
    786 
    787 RenderObject* HTMLElement::createRenderer(RenderArena* arena, RenderStyle* style)
    788 {
    789     if (hasLocalName(wbrTag))
    790         return new (arena) RenderWordBreak(this);
    791     return RenderObject::createObject(this, style);
    792 }
    793 
    794 HTMLFormElement* HTMLElement::findFormAncestor() const
    795 {
    796     for (ContainerNode* ancestor = parentNode(); ancestor; ancestor = ancestor->parentNode()) {
    797         if (ancestor->hasTagName(formTag))
    798             return static_cast<HTMLFormElement*>(ancestor);
    799     }
    800     return 0;
    801 }
    802 
    803 HTMLFormElement* HTMLElement::virtualForm() const
    804 {
    805     return findFormAncestor();
    806 }
    807 
    808 static void setHasDirAutoFlagRecursively(Node* firstNode, bool flag, Node* lastNode = 0)
    809 {
    810     firstNode->setSelfOrAncestorHasDirAutoAttribute(flag);
    811 
    812     Node* node = firstNode->firstChild();
    813 
    814     while (node) {
    815         if (node->selfOrAncestorHasDirAutoAttribute() == flag)
    816             return;
    817 
    818         if (node->isHTMLElement() && toElement(node)->hasAttribute(dirAttr)) {
    819             if (node == lastNode)
    820                 return;
    821             node = node->traverseNextSibling(firstNode);
    822             continue;
    823         }
    824         node->setSelfOrAncestorHasDirAutoAttribute(flag);
    825         if (node == lastNode)
    826             return;
    827         node = node->traverseNextNode(firstNode);
    828     }
    829 }
    830 
    831 void HTMLElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
    832 {
    833     StyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
    834     adjustDirectionalityIfNeededAfterChildrenChanged(beforeChange, childCountDelta);
    835 }
    836 
    837 TextDirection HTMLElement::directionalityIfhasDirAutoAttribute(bool& isAuto) const
    838 {
    839     if (!(selfOrAncestorHasDirAutoAttribute() && equalIgnoringCase(getAttribute(dirAttr), "auto"))) {
    840         isAuto = false;
    841         return LTR;
    842     }
    843 
    844     isAuto = true;
    845     return directionality();
    846 }
    847 
    848 TextDirection HTMLElement::directionality(Node** strongDirectionalityTextNode) const
    849 {
    850     Node* node = firstChild();
    851     while (node) {
    852         // Skip bdi, script and style elements
    853         if (equalIgnoringCase(node->nodeName(), "bdi") || node->hasTagName(scriptTag) || node->hasTagName(styleTag)) {
    854             node = node->traverseNextSibling(this);
    855             continue;
    856         }
    857 
    858         // Skip elements with valid dir attribute
    859         if (node->isElementNode()) {
    860             AtomicString dirAttributeValue = toElement(node)->fastGetAttribute(dirAttr);
    861             if (equalIgnoringCase(dirAttributeValue, "rtl") || equalIgnoringCase(dirAttributeValue, "ltr") || equalIgnoringCase(dirAttributeValue, "auto")) {
    862                 node = node->traverseNextSibling(this);
    863                 continue;
    864             }
    865         }
    866 
    867         if (node->isTextNode()) {
    868             bool hasStrongDirectionality;
    869             WTF::Unicode::Direction textDirection = node->textContent(true).defaultWritingDirection(&hasStrongDirectionality);
    870             if (hasStrongDirectionality) {
    871                 if (strongDirectionalityTextNode)
    872                     *strongDirectionalityTextNode = node;
    873                 return (textDirection == WTF::Unicode::LeftToRight) ? LTR : RTL;
    874             }
    875         }
    876         node = node->traverseNextNode(this);
    877     }
    878     if (strongDirectionalityTextNode)
    879         *strongDirectionalityTextNode = 0;
    880     return LTR;
    881 }
    882 
    883 void HTMLElement::dirAttributeChanged(Attribute* attribute)
    884 {
    885     Element* parent = parentElement();
    886 
    887     if (parent && parent->isHTMLElement() && parent->selfOrAncestorHasDirAutoAttribute())
    888         toHTMLElement(parent)->adjustDirectionalityIfNeededAfterChildAttributeChanged(this);
    889 
    890     if (equalIgnoringCase(attribute->value(), "auto"))
    891         calculateAndAdjustDirectionality();
    892 }
    893 
    894 void HTMLElement::adjustDirectionalityIfNeededAfterChildAttributeChanged(Element* child)
    895 {
    896     ASSERT(selfOrAncestorHasDirAutoAttribute());
    897     Node* strongDirectionalityTextNode;
    898     TextDirection textDirection = directionality(&strongDirectionalityTextNode);
    899     setHasDirAutoFlagRecursively(child, false);
    900     if (renderer() && renderer()->style() && renderer()->style()->direction() != textDirection) {
    901         Element* elementToAdjust = this;
    902         for (; elementToAdjust; elementToAdjust = elementToAdjust->parentElement()) {
    903             if (elementToAdjust->hasAttribute(dirAttr)) {
    904                 elementToAdjust->setNeedsStyleRecalc();
    905                 return;
    906             }
    907         }
    908     }
    909 }
    910 
    911 void HTMLElement::calculateAndAdjustDirectionality()
    912 {
    913     Node* strongDirectionalityTextNode;
    914     TextDirection textDirection = directionality(&strongDirectionalityTextNode);
    915     setHasDirAutoFlagRecursively(this, true, strongDirectionalityTextNode);
    916     if (renderer() && renderer()->style() && renderer()->style()->direction() != textDirection)
    917         setNeedsStyleRecalc();
    918 }
    919 
    920 void HTMLElement::adjustDirectionalityIfNeededAfterChildrenChanged(Node* beforeChange, int childCountDelta)
    921 {
    922     if ((!document() || document()->renderer()) && childCountDelta < 0) {
    923         Node* node = beforeChange ? beforeChange->traverseNextSibling() : 0;
    924         for (int counter = 0; node && counter < childCountDelta; counter++, node = node->traverseNextSibling()) {
    925             if (node->isElementNode() && toElement(node)->hasAttribute(dirAttr))
    926                 continue;
    927 
    928             setHasDirAutoFlagRecursively(node, false);
    929         }
    930     }
    931 
    932     if (!selfOrAncestorHasDirAutoAttribute())
    933         return;
    934 
    935     Node* oldMarkedNode = beforeChange ? beforeChange->traverseNextSibling() : 0;
    936     while (oldMarkedNode && oldMarkedNode->isHTMLElement() && toHTMLElement(oldMarkedNode)->hasAttribute(dirAttr))
    937         oldMarkedNode = oldMarkedNode->traverseNextSibling(this);
    938     if (oldMarkedNode)
    939         setHasDirAutoFlagRecursively(oldMarkedNode, false);
    940 
    941     for (Element* elementToAdjust = this; elementToAdjust; elementToAdjust = elementToAdjust->parentElement()) {
    942         if (elementToAdjust->isHTMLElement() && elementToAdjust->hasAttribute(dirAttr)) {
    943             toHTMLElement(elementToAdjust)->calculateAndAdjustDirectionality();
    944             return;
    945         }
    946     }
    947 }
    948 
    949 } // namespace WebCore
    950 
    951 #ifndef NDEBUG
    952 
    953 // For use in the debugger
    954 void dumpInnerHTML(WebCore::HTMLElement*);
    955 
    956 void dumpInnerHTML(WebCore::HTMLElement* element)
    957 {
    958     printf("%s\n", element->innerHTML().ascii().data());
    959 }
    960 #endif
    961