String WebFrameSerializerImpl::preActionBeforeSerializeOpenTag(
const Element* element, SerializeDomParam* param, bool* needSkip)
{
StringBuilder result;
*needSkip = false;
if (param->isHTMLDocument) {
// Skip the open tag of original META tag which declare charset since we
// have overrided the META which have correct charset declaration after
// serializing open tag of HEAD element.
DCHECK(element);
if (isHTMLMetaElement(element) && toHTMLMetaElement(element)->computeEncoding().isValid()) {
// Found META tag declared charset, we need to skip it when
// serializing DOM.
param->skipMetaElement = element;
*needSkip = true;
} else if (isHTMLHtmlElement(*element)) {
// Check something before processing the open tag of HEAD element.
// First we add doc type declaration if original document has it.
if (!param->haveSeenDocType) {
param->haveSeenDocType = true;
result.append(createMarkup(param->document->doctype()));
}
// Add MOTW declaration before html tag.
// See http://msdn2.microsoft.com/en-us/library/ms537628(VS.85).aspx.
result.append(WebFrameSerializer::generateMarkOfTheWebDeclaration(param->url));
} else if (isHTMLBaseElement(*element)) {
// Comment the BASE tag when serializing dom.
result.appendLiteral("<!--");
}
} else {
// Write XML declaration.
if (!param->haveAddedXMLProcessingDirective) {
param->haveAddedXMLProcessingDirective = true;
// Get encoding info.
String xmlEncoding = param->document->xmlEncoding();
if (xmlEncoding.isEmpty())
xmlEncoding = param->document->encodingName();
if (xmlEncoding.isEmpty())
xmlEncoding = UTF8Encoding().name();
result.appendLiteral("<?xml version=\"");
result.append(param->document->xmlVersion());
result.appendLiteral("\" encoding=\"");
result.append(xmlEncoding);
if (param->document->xmlStandalone())
result.appendLiteral("\" standalone=\"yes");
result.appendLiteral("\"?>\n");
}
// Add doc type declaration if original document has it.
if (!param->haveSeenDocType) {
param->haveSeenDocType = true;
result.append(createMarkup(param->document->doctype()));
}
}
return result.toString();
}
// After we finish serializing end tag of a element, we give the target
// element a chance to do some post work to add some additional data.
String WebPageSerializerImpl::postActionAfterSerializeEndTag(
const Element* element, SerializeDomParam* param)
{
StringBuilder result;
if (!param->isHTMLDocument)
return result.toString();
// Comment the BASE tag when serializing DOM.
if (isHTMLBaseElement(*element)) {
result.append("-->");
// Append a new base tag declaration.
result.append(WebPageSerializer::generateBaseTagDeclaration(
param->document->baseTarget()));
}
return result.toString();
}