The Tor Browser: content/base/src/nsXMLContentSerializer.cpp@6474c204b198 (annotated)

content/base/src/nsXMLContentSerializer.cpp@6474c204b198 (annotated)

content/base/src/nsXMLContentSerializer.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * nsIContentSerializer implementation that can be used with an
  * nsIDocumentEncoder to convert an XML DOM to an XML string that
  * could be parsed into more or less the original DOM.
  */
 #include "nsXMLContentSerializer.h"
 #include "nsGkAtoms.h"
 #include "nsIDOMProcessingInstruction.h"
 #include "nsIDOMComment.h"
 #include "nsIDOMDocumentType.h"
 #include "nsIContent.h"
 #include "nsIDocument.h"
 #include "nsIDocumentEncoder.h"
 #include "nsNameSpaceManager.h"
 #include "nsTextFragment.h"
 #include "nsString.h"
 #include "prprf.h"
 #include "nsUnicharUtils.h"
 #include "nsCRT.h"
 #include "nsContentUtils.h"
 #include "nsAttrName.h"
 #include "nsILineBreaker.h"
 #include "mozilla/dom/Element.h"
 #include "nsParserConstants.h"
 using namespace mozilla::dom;
 #define kXMLNS "xmlns"
 // to be readable, we assume that an indented line contains
 // at least this number of characters (arbitrary value here).
 // This is a limit for the indentation.
 #define MIN_INDENTED_LINE_LENGTH 15
 // the string used to indent.
 #define INDENT_STRING "  "
 #define INDENT_STRING_LENGTH 2
 nsresult NS_NewXMLContentSerializer(nsIContentSerializer** aSerializer)
 {
   nsXMLContentSerializer* it = new nsXMLContentSerializer();
   if (!it) {
     return NS_ERROR_OUT_OF_MEMORY;
   }
   return CallQueryInterface(it, aSerializer);
 }
 nsXMLContentSerializer::nsXMLContentSerializer()
   : mPrefixIndex(0),
     mColPos(0),
     mIndentOverflow(0),
     mIsIndentationAddedOnCurrentLine(false),
     mInAttribute(false),
     mAddNewlineForRootNode(false),
     mAddSpace(false),
     mMayIgnoreLineBreakSequence(false),
     mBodyOnly(false),
     mInBody(0)
 {
 }
 nsXMLContentSerializer::~nsXMLContentSerializer()
 {
 }
 NS_IMPL_ISUPPORTS(nsXMLContentSerializer, nsIContentSerializer)
 NS_IMETHODIMP
 nsXMLContentSerializer::Init(uint32_t aFlags, uint32_t aWrapColumn,
                              const char* aCharSet, bool aIsCopying,
                              bool aRewriteEncodingDeclaration)
 {
   mPrefixIndex = 0;
   mColPos = 0;
   mIndentOverflow = 0;
   mIsIndentationAddedOnCurrentLine = false;
   mInAttribute = false;
   mAddNewlineForRootNode = false;
   mAddSpace = false;
   mMayIgnoreLineBreakSequence = false;
   mBodyOnly = false;
   mInBody = 0;
   mCharset = aCharSet;
   mFlags = aFlags;
   // Set the line break character:
   if ((mFlags & nsIDocumentEncoder::OutputCRLineBreak)
       && (mFlags & nsIDocumentEncoder::OutputLFLineBreak)) { // Windows
     mLineBreak.AssignLiteral("\r\n");
   }
   else if (mFlags & nsIDocumentEncoder::OutputCRLineBreak) { // Mac
     mLineBreak.AssignLiteral("\r");
   }
   else if (mFlags & nsIDocumentEncoder::OutputLFLineBreak) { // Unix/DOM
     mLineBreak.AssignLiteral("\n");
   }
   else {
     mLineBreak.AssignLiteral(NS_LINEBREAK);         // Platform/default
   }
   mDoRaw = !!(mFlags & nsIDocumentEncoder::OutputRaw);
   mDoFormat = (mFlags & nsIDocumentEncoder::OutputFormatted && !mDoRaw);
   mDoWrap = (mFlags & nsIDocumentEncoder::OutputWrap && !mDoRaw);
   if (!aWrapColumn) {
     mMaxColumn = 72;
   }
   else {
     mMaxColumn = aWrapColumn;
   }
   mPreLevel = 0;
   mIsIndentationAddedOnCurrentLine = false;
   return NS_OK;
 }
 nsresult
 nsXMLContentSerializer::AppendTextData(nsIContent* aNode,
                                        int32_t aStartOffset,
                                        int32_t aEndOffset,
                                        nsAString& aStr,
                                        bool aTranslateEntities)
 {
   nsIContent* content = aNode;
   const nsTextFragment* frag;
   if (!content || !(frag = content->GetText())) {
     return NS_ERROR_FAILURE;
   }
   int32_t fragLength = frag->GetLength();
   int32_t endoffset = (aEndOffset == -1) ? fragLength : std::min(aEndOffset, fragLength);
   int32_t length = endoffset - aStartOffset;
   NS_ASSERTION(aStartOffset >= 0, "Negative start offset for text fragment!");
   NS_ASSERTION(aStartOffset <= endoffset, "A start offset is beyond the end of the text fragment!");
   if (length <= 0) {
     // XXX Zero is a legal value, maybe non-zero values should be an
     // error.
     return NS_OK;
   }
   if (frag->Is2b()) {
     const char16_t *strStart = frag->Get2b() + aStartOffset;
     if (aTranslateEntities) {
       AppendAndTranslateEntities(Substring(strStart, strStart + length), aStr);
     }
     else {
       aStr.Append(Substring(strStart, strStart + length));
     }
   }
   else {
     if (aTranslateEntities) {
       AppendAndTranslateEntities(NS_ConvertASCIItoUTF16(frag->Get1b()+aStartOffset, length), aStr);
     }
     else {
       aStr.Append(NS_ConvertASCIItoUTF16(frag->Get1b()+aStartOffset, length));
     }
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendText(nsIContent* aText,
                                    int32_t aStartOffset,
                                    int32_t aEndOffset,
                                    nsAString& aStr)
 {
   NS_ENSURE_ARG(aText);
   nsAutoString data;
   nsresult rv;
   rv = AppendTextData(aText, aStartOffset, aEndOffset, data, true);
   if (NS_FAILED(rv))
     return NS_ERROR_FAILURE;
   if (mPreLevel > 0 || mDoRaw) {
     AppendToStringConvertLF(data, aStr);
   }
   else if (mDoFormat) {
     AppendToStringFormatedWrapped(data, aStr);
   }
   else if (mDoWrap) {
     AppendToStringWrapped(data, aStr);
   }
   else {
     AppendToStringConvertLF(data, aStr);
   }
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendCDATASection(nsIContent* aCDATASection,
                                            int32_t aStartOffset,
                                            int32_t aEndOffset,
                                            nsAString& aStr)
 {
   NS_ENSURE_ARG(aCDATASection);
   nsresult rv;
   NS_NAMED_LITERAL_STRING(cdata , "<![CDATA[");
   if (mPreLevel > 0 || mDoRaw) {
     AppendToString(cdata, aStr);
   }
   else if (mDoFormat) {
     AppendToStringFormatedWrapped(cdata, aStr);
   }
   else if (mDoWrap) {
     AppendToStringWrapped(cdata, aStr);
   }
   else {
     AppendToString(cdata, aStr);
   }
   nsAutoString data;
   rv = AppendTextData(aCDATASection, aStartOffset, aEndOffset, data, false);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   AppendToStringConvertLF(data, aStr);
   AppendToString(NS_LITERAL_STRING("]]>"), aStr);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendProcessingInstruction(nsIContent* aPI,
                                                     int32_t aStartOffset,
                                                     int32_t aEndOffset,
                                                     nsAString& aStr)
 {
   nsCOMPtr<nsIDOMProcessingInstruction> pi = do_QueryInterface(aPI);
   NS_ENSURE_ARG(pi);
   nsresult rv;
   nsAutoString target, data, start;
   MaybeAddNewlineForRootNode(aStr);
   rv = pi->GetTarget(target);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   rv = pi->GetData(data);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   start.AppendLiteral("<?");
   start.Append(target);
   if (mPreLevel > 0 || mDoRaw) {
     AppendToString(start, aStr);
   }
   else if (mDoFormat) {
     if (mAddSpace) {
       AppendNewLineToString(aStr);
     }
     AppendToStringFormatedWrapped(start, aStr);
   }
   else if (mDoWrap) {
     AppendToStringWrapped(start, aStr);
   }
   else {
     AppendToString(start, aStr);
   }
   if (!data.IsEmpty()) {
     AppendToString(char16_t(' '), aStr);
     AppendToStringConvertLF(data, aStr);
   }
   AppendToString(NS_LITERAL_STRING("?>"), aStr);
   MaybeFlagNewlineForRootNode(aPI);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendComment(nsIContent* aComment,
                                       int32_t aStartOffset,
                                       int32_t aEndOffset,
                                       nsAString& aStr)
 {
   nsCOMPtr<nsIDOMComment> comment = do_QueryInterface(aComment);
   NS_ENSURE_ARG(comment);
   nsresult rv;
   nsAutoString data;
   rv = comment->GetData(data);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   int32_t dataLength = data.Length();
   if (aStartOffset || (aEndOffset != -1 && aEndOffset < dataLength)) {
     int32_t length =
       (aEndOffset == -1) ? dataLength : std::min(aEndOffset, dataLength);
     length -= aStartOffset;
     nsAutoString frag;
     if (length > 0) {
       data.Mid(frag, aStartOffset, length);
     }
     data.Assign(frag);
   }
   MaybeAddNewlineForRootNode(aStr);
   NS_NAMED_LITERAL_STRING(startComment, "<!--");
   if (mPreLevel > 0 || mDoRaw) {
     AppendToString(startComment, aStr);
   }
   else if (mDoFormat) {
     if (mAddSpace) {
       AppendNewLineToString(aStr);
     }
     AppendToStringFormatedWrapped(startComment, aStr);
   }
   else if (mDoWrap) {
     AppendToStringWrapped(startComment, aStr);
   }
   else {
     AppendToString(startComment, aStr);
   }
   // Even if mDoformat, we don't format the content because it
   // could have been preformated by the author
   AppendToStringConvertLF(data, aStr);
   AppendToString(NS_LITERAL_STRING("-->"), aStr);
   MaybeFlagNewlineForRootNode(aComment);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendDoctype(nsIContent* aDocType,
                                       nsAString& aStr)
 {
   nsCOMPtr<nsIDOMDocumentType> docType = do_QueryInterface(aDocType);
   NS_ENSURE_ARG(docType);
   nsresult rv;
   nsAutoString name, publicId, systemId, internalSubset;
   rv = docType->GetName(name);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   rv = docType->GetPublicId(publicId);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   rv = docType->GetSystemId(systemId);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   rv = docType->GetInternalSubset(internalSubset);
   if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
   MaybeAddNewlineForRootNode(aStr);
   AppendToString(NS_LITERAL_STRING("<!DOCTYPE "), aStr);
   AppendToString(name, aStr);
   char16_t quote;
   if (!publicId.IsEmpty()) {
     AppendToString(NS_LITERAL_STRING(" PUBLIC "), aStr);
     if (publicId.FindChar(char16_t('"')) == -1) {
       quote = char16_t('"');
     }
     else {
       quote = char16_t('\'');
     }
     AppendToString(quote, aStr);
     AppendToString(publicId, aStr);
     AppendToString(quote, aStr);
     if (!systemId.IsEmpty()) {
       AppendToString(char16_t(' '), aStr);
       if (systemId.FindChar(char16_t('"')) == -1) {
         quote = char16_t('"');
       }
       else {
         quote = char16_t('\'');
       }
       AppendToString(quote, aStr);
       AppendToString(systemId, aStr);
       AppendToString(quote, aStr);
     }
   }
   else if (!systemId.IsEmpty()) {
     if (systemId.FindChar(char16_t('"')) == -1) {
       quote = char16_t('"');
     }
     else {
       quote = char16_t('\'');
     }
     AppendToString(NS_LITERAL_STRING(" SYSTEM "), aStr);
     AppendToString(quote, aStr);
     AppendToString(systemId, aStr);
     AppendToString(quote, aStr);
   }
   if (!internalSubset.IsEmpty()) {
     AppendToString(NS_LITERAL_STRING(" ["), aStr);
     AppendToString(internalSubset, aStr);
     AppendToString(char16_t(']'), aStr);
   }
   AppendToString(kGreaterThan, aStr);
   MaybeFlagNewlineForRootNode(aDocType);
   return NS_OK;
 }
 nsresult
 nsXMLContentSerializer::PushNameSpaceDecl(const nsAString& aPrefix,
                                           const nsAString& aURI,
                                           nsIContent* aOwner)
 {
   NameSpaceDecl* decl = mNameSpaceStack.AppendElement();
   if (!decl) return NS_ERROR_OUT_OF_MEMORY;
   decl->mPrefix.Assign(aPrefix);
   decl->mURI.Assign(aURI);
   // Don't addref - this weak reference will be removed when
   // we pop the stack
   decl->mOwner = aOwner;
   return NS_OK;
 }
 void
 nsXMLContentSerializer::PopNameSpaceDeclsFor(nsIContent* aOwner)
 {
   int32_t index, count;
   count = mNameSpaceStack.Length();
   for (index = count - 1; index >= 0; index--) {
     if (mNameSpaceStack[index].mOwner != aOwner) {
       break;
     }
     mNameSpaceStack.RemoveElementAt(index);
   }
 }
 bool
 nsXMLContentSerializer::ConfirmPrefix(nsAString& aPrefix,
                                       const nsAString& aURI,
                                       nsIContent* aElement,
                                       bool aIsAttribute)
 {
   if (aPrefix.EqualsLiteral(kXMLNS)) {
     return false;
   }
   if (aURI.EqualsLiteral("http://www.w3.org/XML/1998/namespace")) {
     // The prefix must be xml for this namespace. We don't need to declare it,
     // so always just set the prefix to xml.
     aPrefix.AssignLiteral("xml");
     return false;
   }
   bool mustHavePrefix;
   if (aIsAttribute) {
     if (aURI.IsEmpty()) {
       // Attribute in the null namespace.  This just shouldn't have a prefix.
       // And there's no need to push any namespace decls
       aPrefix.Truncate();
       return false;
     }
     // Attribute not in the null namespace -- must have a prefix
     mustHavePrefix = true;
   } else {
     // Not an attribute, so doesn't _have_ to have a prefix
     mustHavePrefix = false;
   }
   // Keep track of the closest prefix that's bound to aURI and whether we've
   // found such a thing.  closestURIMatch holds the prefix, and uriMatch
   // indicates whether we actually have one.
   nsAutoString closestURIMatch;
   bool uriMatch = false;
   // Also keep track of whether we've seen aPrefix already.  If we have, that
   // means that it's already bound to a URI different from aURI, so even if we
   // later (so in a more outer scope) see it bound to aURI we can't reuse it.
   bool haveSeenOurPrefix = false;
   int32_t count = mNameSpaceStack.Length();
   int32_t index = count - 1;
   while (index >= 0) {
     NameSpaceDecl& decl = mNameSpaceStack.ElementAt(index);
     // Check if we've found a prefix match
     if (aPrefix.Equals(decl.mPrefix)) {
       // If the URIs match and aPrefix is not bound to any other URI, we can
       // use aPrefix
       if (!haveSeenOurPrefix && aURI.Equals(decl.mURI)) {
         // Just use our uriMatch stuff.  That will deal with an empty aPrefix
         // the right way.  We can break out of the loop now, though.
         uriMatch = true;
         closestURIMatch = aPrefix;
         break;
       }
       haveSeenOurPrefix = true;
       // If they don't, and either:
       // 1) We have a prefix (so we'd be redeclaring this prefix to point to a
       //    different namespace) or
       // 2) We're looking at an existing default namespace decl on aElement (so
       //    we can't create a new default namespace decl for this URI)
       // then generate a new prefix.  Note that we do NOT generate new prefixes
       // if we happen to have aPrefix == decl->mPrefix == "" and mismatching
       // URIs when |decl| doesn't have aElement as its owner.  In that case we
       // can simply push the new namespace URI as the default namespace for
       // aElement.
       if (!aPrefix.IsEmpty() || decl.mOwner == aElement) {
         NS_ASSERTION(!aURI.IsEmpty(),
                      "Not allowed to add a xmlns attribute with an empty "
                      "namespace name unless it declares the default "
                      "namespace.");
         GenerateNewPrefix(aPrefix);
         // Now we need to validate our new prefix/uri combination; check it
         // against the full namespace stack again.  Note that just restarting
         // the while loop is ok, since we haven't changed aURI, so the
         // closestURIMatch and uriMatch state is not affected.
         index = count - 1;
         haveSeenOurPrefix = false;
         continue;
       }
     }
     // If we've found a URI match, then record the first one
     if (!uriMatch && aURI.Equals(decl.mURI)) {
       // Need to check that decl->mPrefix is not declared anywhere closer to
       // us.  If it is, we can't use it.
       bool prefixOK = true;
       int32_t index2;
       for (index2 = count-1; index2 > index && prefixOK; --index2) {
         prefixOK = (mNameSpaceStack[index2].mPrefix != decl.mPrefix);
       }
       if (prefixOK) {
         uriMatch = true;
         closestURIMatch.Assign(decl.mPrefix);
       }
     }
     --index;
   }
   // At this point the following invariants hold:
   // 1) The prefix in closestURIMatch is mapped to aURI in our scope if
   //    uriMatch is set.
   // 2) There is nothing on the namespace stack that has aPrefix as the prefix
   //    and a _different_ URI, except for the case aPrefix.IsEmpty (and
   //    possible default namespaces on ancestors)
   // So if uriMatch is set it's OK to use the closestURIMatch prefix.  The one
   // exception is when closestURIMatch is actually empty (default namespace
   // decl) and we must have a prefix.
   if (uriMatch && (!mustHavePrefix || !closestURIMatch.IsEmpty())) {
     aPrefix.Assign(closestURIMatch);
     return false;
   }
   if (aPrefix.IsEmpty()) {
     // At this point, aPrefix is empty (which means we never had a prefix to
     // start with).  If we must have a prefix, just generate a new prefix and
     // then send it back through the namespace stack checks to make sure it's
     // OK.
     if (mustHavePrefix) {
       GenerateNewPrefix(aPrefix);
       return ConfirmPrefix(aPrefix, aURI, aElement, aIsAttribute);
     }
     // One final special case.  If aPrefix is empty and we never saw an empty
     // prefix (default namespace decl) on the namespace stack and we're in the
     // null namespace there is no reason to output an |xmlns=""| here.  It just
     // makes the output less readable.
     if (!haveSeenOurPrefix && aURI.IsEmpty()) {
       return false;
     }
   }
   // Now just set aURI as the new default namespace URI.  Indicate that we need
   // to create a namespace decl for the final prefix
   return true;
 }
 void
 nsXMLContentSerializer::GenerateNewPrefix(nsAString& aPrefix)
 {
   aPrefix.AssignLiteral("a");
   char buf[128];
   PR_snprintf(buf, sizeof(buf), "%d", mPrefixIndex++);
   AppendASCIItoUTF16(buf, aPrefix);
 }
 void
 nsXMLContentSerializer::SerializeAttr(const nsAString& aPrefix,
                                       const nsAString& aName,
                                       const nsAString& aValue,
                                       nsAString& aStr,
                                       bool aDoEscapeEntities)
 {
   nsAutoString attrString_;
   // For innerHTML we can do faster appending without
   // temporary strings.
   bool rawAppend = mDoRaw && aDoEscapeEntities;
   nsAString& attrString = (rawAppend) ? aStr : attrString_;
   attrString.Append(char16_t(' '));
   if (!aPrefix.IsEmpty()) {
     attrString.Append(aPrefix);
     attrString.Append(char16_t(':'));
   }
   attrString.Append(aName);
   if (aDoEscapeEntities) {
     // if problem characters are turned into character entity references
     // then there will be no problem with the value delimiter characters
     attrString.AppendLiteral("=\"");
     mInAttribute = true;
     AppendAndTranslateEntities(aValue, attrString);
     mInAttribute = false;
     attrString.Append(char16_t('"'));
     if (rawAppend) {
       return;
     }
   }
   else {
     // Depending on whether the attribute value contains quotes or apostrophes we
     // need to select the delimiter character and escape characters using
     // character entity references, ignoring the value of aDoEscapeEntities.
     // See http://www.w3.org/TR/REC-html40/appendix/notes.html#h-B.3.2.2 for
     // the standard on character entity references in values.  We also have to
     // make sure to escape any '&' characters.
     bool bIncludesSingle = false;
     bool bIncludesDouble = false;
     nsAString::const_iterator iCurr, iEnd;
     uint32_t uiSize, i;
     aValue.BeginReading(iCurr);
     aValue.EndReading(iEnd);
     for ( ; iCurr != iEnd; iCurr.advance(uiSize) ) {
       const char16_t * buf = iCurr.get();
       uiSize = iCurr.size_forward();
       for ( i = 0; i < uiSize; i++, buf++ ) {
         if ( *buf == char16_t('\'') )
         {
           bIncludesSingle = true;
           if ( bIncludesDouble ) break;
         }
         else if ( *buf == char16_t('"') )
         {
           bIncludesDouble = true;
           if ( bIncludesSingle ) break;
         }
       }
       // if both have been found we don't need to search further
       if ( bIncludesDouble && bIncludesSingle ) break;
     }
     // Delimiter and escaping is according to the following table
     //    bIncludesDouble     bIncludesSingle     Delimiter       Escape Double Quote
     //    FALSE               FALSE               "               FALSE
     //    FALSE               TRUE                "               FALSE
     //    TRUE                FALSE               '               FALSE
     //    TRUE                TRUE                "               TRUE
     char16_t cDelimiter =
         (bIncludesDouble && !bIncludesSingle) ? char16_t('\'') : char16_t('"');
     attrString.Append(char16_t('='));
     attrString.Append(cDelimiter);
     nsAutoString sValue(aValue);
     sValue.ReplaceSubstring(NS_LITERAL_STRING("&"),
                             NS_LITERAL_STRING("&amp;"));
     if (bIncludesDouble && bIncludesSingle) {
       sValue.ReplaceSubstring(NS_LITERAL_STRING("\""),
                               NS_LITERAL_STRING("&quot;"));
     }
     attrString.Append(sValue);
     attrString.Append(cDelimiter);
   }
   if (mPreLevel > 0 || mDoRaw) {
     AppendToStringConvertLF(attrString, aStr);
   }
   else if (mDoFormat) {
     AppendToStringFormatedWrapped(attrString, aStr);
   }
   else if (mDoWrap) {
     AppendToStringWrapped(attrString, aStr);
   }
   else {
     AppendToStringConvertLF(attrString, aStr);
   }
 }
 uint32_t
 nsXMLContentSerializer::ScanNamespaceDeclarations(nsIContent* aContent,
                                                   nsIContent *aOriginalElement,
                                                   const nsAString& aTagNamespaceURI)
 {
   uint32_t index, count;
   nsAutoString uriStr, valueStr;
   count = aContent->GetAttrCount();
   // First scan for namespace declarations, pushing each on the stack
   uint32_t skipAttr = count;
   for (index = 0; index < count; index++) {
     const nsAttrName* name = aContent->GetAttrNameAt(index);
     int32_t namespaceID = name->NamespaceID();
     nsIAtom *attrName = name->LocalName();
     if (namespaceID == kNameSpaceID_XMLNS ||
         // Also push on the stack attrs named "xmlns" in the null
         // namespace... because once we serialize those out they'll look like
         // namespace decls.  :(
         // XXXbz what if we have both "xmlns" in the null namespace and "xmlns"
         // in the xmlns namespace?
         (namespaceID == kNameSpaceID_None &&
          attrName == nsGkAtoms::xmlns)) {
       aContent->GetAttr(namespaceID, attrName, uriStr);
       if (!name->GetPrefix()) {
         if (aTagNamespaceURI.IsEmpty() && !uriStr.IsEmpty()) {
           // If the element is in no namespace we need to add a xmlns
           // attribute to declare that. That xmlns attribute must not have a
           // prefix (see http://www.w3.org/TR/REC-xml-names/#dt-prefix), ie it
           // must declare the default namespace. We just found an xmlns
           // attribute that declares the default namespace to something
           // non-empty. We're going to ignore this attribute, for children we
           // will detect that we need to add it again and attributes aren't
           // affected by the default namespace.
           skipAttr = index;
         }
         else {
           // Default NS attribute does not have prefix (and the name is "xmlns")
           PushNameSpaceDecl(EmptyString(), uriStr, aOriginalElement);
         }
       }
       else {
         PushNameSpaceDecl(nsDependentAtomString(attrName), uriStr,
                           aOriginalElement);
       }
     }
   }
   return skipAttr;
 }
 bool
 nsXMLContentSerializer::IsJavaScript(nsIContent * aContent, nsIAtom* aAttrNameAtom,
                                      int32_t aAttrNamespaceID, const nsAString& aValueString)
 {
   bool isHtml = aContent->IsHTML();
   bool isXul = aContent->IsXUL();
   bool isSvg = aContent->IsSVG();
   if (aAttrNamespaceID == kNameSpaceID_None &&
       (isHtml || isXul || isSvg) &&
       (aAttrNameAtom == nsGkAtoms::href ||
        aAttrNameAtom == nsGkAtoms::src)) {
     static const char kJavaScript[] = "javascript";
     int32_t pos = aValueString.FindChar(':');
     if (pos < (int32_t)(sizeof kJavaScript - 1))
         return false;
     nsAutoString scheme(Substring(aValueString, 0, pos));
     scheme.StripWhitespace();
     if ((scheme.Length() == (sizeof kJavaScript - 1)) &&
         scheme.EqualsIgnoreCase(kJavaScript))
       return true;
     else
       return false;
   }
   return aContent->IsEventAttributeName(aAttrNameAtom);
 }
 void
 nsXMLContentSerializer::SerializeAttributes(nsIContent* aContent,
                                             nsIContent *aOriginalElement,
                                             nsAString& aTagPrefix,
                                             const nsAString& aTagNamespaceURI,
                                             nsIAtom* aTagName,
                                             nsAString& aStr,
                                             uint32_t aSkipAttr,
                                             bool aAddNSAttr)
 {
   nsAutoString prefixStr, uriStr, valueStr;
   nsAutoString xmlnsStr;
   xmlnsStr.AssignLiteral(kXMLNS);
   uint32_t index, count;
   // If we had to add a new namespace declaration, serialize
   // and push it on the namespace stack
   if (aAddNSAttr) {
     if (aTagPrefix.IsEmpty()) {
       // Serialize default namespace decl
       SerializeAttr(EmptyString(), xmlnsStr, aTagNamespaceURI, aStr, true);
     }
     else {
       // Serialize namespace decl
       SerializeAttr(xmlnsStr, aTagPrefix, aTagNamespaceURI, aStr, true);
     }
     PushNameSpaceDecl(aTagPrefix, aTagNamespaceURI, aOriginalElement);
   }
   count = aContent->GetAttrCount();
   // Now serialize each of the attributes
   // XXX Unfortunately we need a namespace manager to get
   // attribute URIs.
   for (index = 0; index < count; index++) {
     if (aSkipAttr == index) {
         continue;
     }
     const nsAttrName* name = aContent->GetAttrNameAt(index);
     int32_t namespaceID = name->NamespaceID();
     nsIAtom* attrName = name->LocalName();
     nsIAtom* attrPrefix = name->GetPrefix();
     // Filter out any attribute starting with [-|_]moz
     nsDependentAtomString attrNameStr(attrName);
     if (StringBeginsWith(attrNameStr, NS_LITERAL_STRING("_moz")) ||
         StringBeginsWith(attrNameStr, NS_LITERAL_STRING("-moz"))) {
       continue;
     }
     if (attrPrefix) {
       attrPrefix->ToString(prefixStr);
     }
     else {
       prefixStr.Truncate();
     }
     bool addNSAttr = false;
     if (kNameSpaceID_XMLNS != namespaceID) {
       nsContentUtils::NameSpaceManager()->GetNameSpaceURI(namespaceID, uriStr);
       addNSAttr = ConfirmPrefix(prefixStr, uriStr, aOriginalElement, true);
     }
     aContent->GetAttr(namespaceID, attrName, valueStr);
     nsDependentAtomString nameStr(attrName);
     bool isJS = IsJavaScript(aContent, attrName, namespaceID, valueStr);
     SerializeAttr(prefixStr, nameStr, valueStr, aStr, !isJS);
     if (addNSAttr) {
       NS_ASSERTION(!prefixStr.IsEmpty(),
                    "Namespaced attributes must have a prefix");
       SerializeAttr(xmlnsStr, prefixStr, uriStr, aStr, true);
       PushNameSpaceDecl(prefixStr, uriStr, aOriginalElement);
     }
   }
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendElementStart(Element* aElement,
                                            Element* aOriginalElement,
                                            nsAString& aStr)
 {
   NS_ENSURE_ARG(aElement);
   nsIContent* content = aElement;
   bool forceFormat = false;
   if (!CheckElementStart(content, forceFormat, aStr)) {
     return NS_OK;
   }
   nsAutoString tagPrefix, tagLocalName, tagNamespaceURI;
   aElement->NodeInfo()->GetPrefix(tagPrefix);
   aElement->NodeInfo()->GetName(tagLocalName);
   aElement->NodeInfo()->GetNamespaceURI(tagNamespaceURI);
   uint32_t skipAttr = ScanNamespaceDeclarations(content,
                           aOriginalElement, tagNamespaceURI);
   nsIAtom *name = content->Tag();
   bool lineBreakBeforeOpen = LineBreakBeforeOpen(content->GetNameSpaceID(), name);
   if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {
     if (mColPos && lineBreakBeforeOpen) {
       AppendNewLineToString(aStr);
     }
     else {
       MaybeAddNewlineForRootNode(aStr);
     }
     if (!mColPos) {
       AppendIndentation(aStr);
     }
     else if (mAddSpace) {
       AppendToString(char16_t(' '), aStr);
       mAddSpace = false;
     }
   }
   else if (mAddSpace) {
     AppendToString(char16_t(' '), aStr);
     mAddSpace = false;
   }
   else {
     MaybeAddNewlineForRootNode(aStr);
   }
   // Always reset to avoid false newlines in case MaybeAddNewlineForRootNode wasn't
   // called
   mAddNewlineForRootNode = false;
   bool addNSAttr;
   addNSAttr = ConfirmPrefix(tagPrefix, tagNamespaceURI, aOriginalElement,
                             false);
   // Serialize the qualified name of the element
   AppendToString(kLessThan, aStr);
   if (!tagPrefix.IsEmpty()) {
     AppendToString(tagPrefix, aStr);
     AppendToString(NS_LITERAL_STRING(":"), aStr);
   }
   AppendToString(tagLocalName, aStr);
   MaybeEnterInPreContent(content);
   if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {
     IncrIndentation(name);
   }
   SerializeAttributes(content, aOriginalElement, tagPrefix, tagNamespaceURI,
                       name, aStr, skipAttr, addNSAttr);
   AppendEndOfElementStart(aOriginalElement, name, content->GetNameSpaceID(),
                           aStr);
   if ((mDoFormat || forceFormat) && !mPreLevel
     && !mDoRaw && LineBreakAfterOpen(content->GetNameSpaceID(), name)) {
     AppendNewLineToString(aStr);
   }
   AfterElementStart(content, aOriginalElement, aStr);
   return NS_OK;
 }
 void
 nsXMLContentSerializer::AppendEndOfElementStart(nsIContent *aOriginalElement,
                                                 nsIAtom * aName,
                                                 int32_t aNamespaceID,
                                                 nsAString& aStr)
 {
   // We don't output a separate end tag for empty elements
   if (!aOriginalElement->GetChildCount()) {
     AppendToString(NS_LITERAL_STRING("/>"), aStr);
   }
   else {
     AppendToString(kGreaterThan, aStr);
   }
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendElementEnd(Element* aElement,
                                          nsAString& aStr)
 {
   NS_ENSURE_ARG(aElement);
   nsIContent* content = aElement;
   bool forceFormat = false, outputElementEnd;
   outputElementEnd = CheckElementEnd(content, forceFormat, aStr);
   nsIAtom *name = content->Tag();
   if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {
     DecrIndentation(name);
   }
   if (!outputElementEnd) {
     PopNameSpaceDeclsFor(aElement);
     MaybeFlagNewlineForRootNode(aElement);
     return NS_OK;
   }
   nsAutoString tagPrefix, tagLocalName, tagNamespaceURI;
   aElement->NodeInfo()->GetPrefix(tagPrefix);
   aElement->NodeInfo()->GetName(tagLocalName);
   aElement->NodeInfo()->GetNamespaceURI(tagNamespaceURI);
 #ifdef DEBUG
   bool debugNeedToPushNamespace =
 #endif
   ConfirmPrefix(tagPrefix, tagNamespaceURI, aElement, false);
   NS_ASSERTION(!debugNeedToPushNamespace, "Can't push namespaces in closing tag!");
   if ((mDoFormat || forceFormat) && !mPreLevel && !mDoRaw) {
     bool lineBreakBeforeClose = LineBreakBeforeClose(content->GetNameSpaceID(), name);
     if (mColPos && lineBreakBeforeClose) {
       AppendNewLineToString(aStr);
     }
     if (!mColPos) {
       AppendIndentation(aStr);
     }
     else if (mAddSpace) {
       AppendToString(char16_t(' '), aStr);
       mAddSpace = false;
     }
   }
   else if (mAddSpace) {
     AppendToString(char16_t(' '), aStr);
     mAddSpace = false;
   }
   AppendToString(kEndTag, aStr);
   if (!tagPrefix.IsEmpty()) {
     AppendToString(tagPrefix, aStr);
     AppendToString(NS_LITERAL_STRING(":"), aStr);
   }
   AppendToString(tagLocalName, aStr);
   AppendToString(kGreaterThan, aStr);
   PopNameSpaceDeclsFor(aElement);
   MaybeLeaveFromPreContent(content);
   if ((mDoFormat || forceFormat) && !mPreLevel
       && !mDoRaw && LineBreakAfterClose(content->GetNameSpaceID(), name)) {
     AppendNewLineToString(aStr);
   }
   else {
     MaybeFlagNewlineForRootNode(aElement);
   }
   AfterElementEnd(content, aStr);
   return NS_OK;
 }
 NS_IMETHODIMP
 nsXMLContentSerializer::AppendDocumentStart(nsIDocument *aDocument,
                                             nsAString& aStr)
 {
   NS_ENSURE_ARG_POINTER(aDocument);
   nsAutoString version, encoding, standalone;
   aDocument->GetXMLDeclaration(version, encoding, standalone);
   if (version.IsEmpty())
     return NS_OK; // A declaration must have version, or there is no decl
   NS_NAMED_LITERAL_STRING(endQuote, "\"");
   aStr += NS_LITERAL_STRING("<?xml version=\"") + version + endQuote;
   if (!mCharset.IsEmpty()) {
     aStr += NS_LITERAL_STRING(" encoding=\"") +
       NS_ConvertASCIItoUTF16(mCharset) + endQuote;
   }
   // Otherwise just don't output an encoding attr.  Not that we expect
   // mCharset to ever be empty.
 #ifdef DEBUG
   else {
     NS_WARNING("Empty mCharset?  How come?");
   }
 #endif
   if (!standalone.IsEmpty()) {
     aStr += NS_LITERAL_STRING(" standalone=\"") + standalone + endQuote;
   }
   aStr.AppendLiteral("?>");
   mAddNewlineForRootNode = true;
   return NS_OK;
 }
 bool
 nsXMLContentSerializer::CheckElementStart(nsIContent * aContent,
                                           bool & aForceFormat,
                                           nsAString& aStr)
 {
   aForceFormat = false;
   return true;
 }
 bool
 nsXMLContentSerializer::CheckElementEnd(nsIContent * aContent,
                                         bool & aForceFormat,
                                         nsAString& aStr)
 {
   // We don't output a separate end tag for empty element
   aForceFormat = false;
   return aContent->GetChildCount() > 0;
 }
 void
 nsXMLContentSerializer::AppendToString(const char16_t aChar,
                                        nsAString& aOutputStr)
 {
   if (mBodyOnly && !mInBody) {
     return;
   }
   mColPos += 1;
   aOutputStr.Append(aChar);
 }
 void
 nsXMLContentSerializer::AppendToString(const nsAString& aStr,
                                        nsAString& aOutputStr)
 {
   if (mBodyOnly && !mInBody) {
     return;
   }
   mColPos += aStr.Length();
   aOutputStr.Append(aStr);
 }
 static const uint16_t kGTVal = 62;
 static const char* kEntities[] = {
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "&amp;", "",
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "", "",
   "&lt;", "", "&gt;"
 };
 static const char* kAttrEntities[] = {
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "&quot;", "", "", "", "&amp;", "",
   "", "", "", "", "", "", "", "", "", "",
   "", "", "", "", "", "", "", "", "", "",
   "&lt;", "", "&gt;"
 };
 void
 nsXMLContentSerializer::AppendAndTranslateEntities(const nsAString& aStr,
                                                    nsAString& aOutputStr)
 {
   nsReadingIterator<char16_t> done_reading;
   aStr.EndReading(done_reading);
   // for each chunk of |aString|...
   uint32_t advanceLength = 0;
   nsReadingIterator<char16_t> iter;
   const char **entityTable = mInAttribute ? kAttrEntities : kEntities;
   for (aStr.BeginReading(iter);
        iter != done_reading;
        iter.advance(int32_t(advanceLength))) {
     uint32_t fragmentLength = iter.size_forward();
     const char16_t* c = iter.get();
     const char16_t* fragmentStart = c;
     const char16_t* fragmentEnd = c + fragmentLength;
     const char* entityText = nullptr;
     advanceLength = 0;
     // for each character in this chunk, check if it
     // needs to be replaced
     for (; c < fragmentEnd; c++, advanceLength++) {
       char16_t val = *c;
       if ((val <= kGTVal) && (entityTable[val][0] != 0)) {
         entityText = entityTable[val];
         break;
       }
     }
     aOutputStr.Append(fragmentStart, advanceLength);
     if (entityText) {
       AppendASCIItoUTF16(entityText, aOutputStr);
       advanceLength++;
     }
   }
 }
 void
 nsXMLContentSerializer::MaybeAddNewlineForRootNode(nsAString& aStr)
 {
   if (mAddNewlineForRootNode) {
     AppendNewLineToString(aStr);
   }
 }
 void
 nsXMLContentSerializer::MaybeFlagNewlineForRootNode(nsINode* aNode)
 {
   nsINode* parent = aNode->GetParentNode();
   if (parent) {
     mAddNewlineForRootNode = parent->IsNodeOfType(nsINode::eDOCUMENT);
   }
 }
 void
 nsXMLContentSerializer::MaybeEnterInPreContent(nsIContent* aNode)
 {
   // support of the xml:space attribute
   if (aNode->HasAttr(kNameSpaceID_XML, nsGkAtoms::space)) {
     nsAutoString space;
     aNode->GetAttr(kNameSpaceID_XML, nsGkAtoms::space, space);
     if (space.EqualsLiteral("preserve"))
       ++mPreLevel;
   }
 }
 void
 nsXMLContentSerializer::MaybeLeaveFromPreContent(nsIContent* aNode)
 {
   // support of the xml:space attribute
   if (aNode->HasAttr(kNameSpaceID_XML, nsGkAtoms::space)) {
     nsAutoString space;
     aNode->GetAttr(kNameSpaceID_XML, nsGkAtoms::space, space);
     if (space.EqualsLiteral("preserve"))
       --mPreLevel;
   }
 }
 void
 nsXMLContentSerializer::AppendNewLineToString(nsAString& aStr)
 {
   AppendToString(mLineBreak, aStr);
   mMayIgnoreLineBreakSequence = true;
   mColPos = 0;
   mAddSpace = false;
   mIsIndentationAddedOnCurrentLine = false;
 }
 void
 nsXMLContentSerializer::AppendIndentation(nsAString& aStr)
 {
   mIsIndentationAddedOnCurrentLine = true;
   AppendToString(mIndent, aStr);
   mAddSpace = false;
   mMayIgnoreLineBreakSequence = false;
 }
 void
 nsXMLContentSerializer::IncrIndentation(nsIAtom* aName)
 {
   // we want to keep the source readable
   if (mDoWrap &&
       mIndent.Length() >= uint32_t(mMaxColumn) - MIN_INDENTED_LINE_LENGTH) {
     ++mIndentOverflow;
   }
   else {
     mIndent.AppendLiteral(INDENT_STRING);
   }
 }
 void
 nsXMLContentSerializer::DecrIndentation(nsIAtom* aName)
 {
   if(mIndentOverflow)
     --mIndentOverflow;
   else
     mIndent.Cut(0, INDENT_STRING_LENGTH);
 }
 bool
 nsXMLContentSerializer::LineBreakBeforeOpen(int32_t aNamespaceID, nsIAtom* aName)
 {
   return mAddSpace;
 }
 bool
 nsXMLContentSerializer::LineBreakAfterOpen(int32_t aNamespaceID, nsIAtom* aName)
 {
   return false;
 }
 bool
 nsXMLContentSerializer::LineBreakBeforeClose(int32_t aNamespaceID, nsIAtom* aName)
 {
   return mAddSpace;
 }
 bool
 nsXMLContentSerializer::LineBreakAfterClose(int32_t aNamespaceID, nsIAtom* aName)
 {
   return false;
 }
 void
 nsXMLContentSerializer::AppendToStringConvertLF(const nsAString& aStr,
                                                 nsAString& aOutputStr)
 {
   if (mBodyOnly && !mInBody) {
     return;
   }
   if (mDoRaw) {
     AppendToString(aStr, aOutputStr);
   }
   else {
     // Convert line-endings to mLineBreak
     uint32_t start = 0;
     uint32_t theLen = aStr.Length();
     while (start < theLen) {
       int32_t eol = aStr.FindChar('\n', start);
       if (eol == kNotFound) {
         nsDependentSubstring dataSubstring(aStr, start, theLen - start);
         AppendToString(dataSubstring, aOutputStr);
         start = theLen;
         // if there was a line break before this substring
         // AppendNewLineToString was called, so we should reverse
         // this flag
         mMayIgnoreLineBreakSequence = false;
       }
       else {
         nsDependentSubstring dataSubstring(aStr, start, eol - start);
         AppendToString(dataSubstring, aOutputStr);
         AppendNewLineToString(aOutputStr);
         start = eol + 1;
       }
     }
   }
 }
 void
 nsXMLContentSerializer::AppendFormatedWrapped_WhitespaceSequence(
                         nsASingleFragmentString::const_char_iterator &aPos,
                         const nsASingleFragmentString::const_char_iterator aEnd,
                         const nsASingleFragmentString::const_char_iterator aSequenceStart,
                         bool &aMayIgnoreStartOfLineWhitespaceSequence,
                         nsAString &aOutputStr)
 {
   // Handle the complete sequence of whitespace.
   // Continue to iterate until we find the first non-whitespace char.
   // Updates "aPos" to point to the first unhandled char.
   // Also updates the aMayIgnoreStartOfLineWhitespaceSequence flag,
   // as well as the other "global" state flags.
   bool sawBlankOrTab = false;
   bool leaveLoop = false;
   do {
     switch (*aPos) {
       case ' ':
       case '\t':
         sawBlankOrTab = true;
         // no break
       case '\n':
         ++aPos;
         // do not increase mColPos,
         // because we will reduce the whitespace to a single char
         break;
       default:
         leaveLoop = true;
         break;
     }
   } while (!leaveLoop && aPos < aEnd);
   if (mAddSpace) {
     // if we had previously been asked to add space,
     // our situation has not changed
   }
   else if (!sawBlankOrTab && mMayIgnoreLineBreakSequence) {
     // nothing to do in the case where line breaks have already been added
     // before the call of AppendToStringWrapped
     // and only if we found line break in the sequence
     mMayIgnoreLineBreakSequence = false;
   }
   else if (aMayIgnoreStartOfLineWhitespaceSequence) {
     // nothing to do
     aMayIgnoreStartOfLineWhitespaceSequence = false;
   }
   else {
     if (sawBlankOrTab) {
       if (mDoWrap && mColPos + 1 >= mMaxColumn) {
         // no much sense in delaying, we only have one slot left,
         // let's write a break now
         aOutputStr.Append(mLineBreak);
         mColPos = 0;
         mIsIndentationAddedOnCurrentLine = false;
         mMayIgnoreLineBreakSequence = true;
       }
       else {
         // do not write out yet, we may write out either a space or a linebreak
         // let's delay writing it out until we know more
         mAddSpace = true;
         ++mColPos; // eat a slot of available space
       }
     }
     else {
       // Asian text usually does not contain spaces, therefore we should not
       // transform a linebreak into a space.
       // Since we only saw linebreaks, but no spaces or tabs,
       // let's write a linebreak now.
       AppendNewLineToString(aOutputStr);
     }
   }
 }
 void
 nsXMLContentSerializer::AppendWrapped_NonWhitespaceSequence(
                         nsASingleFragmentString::const_char_iterator &aPos,
                         const nsASingleFragmentString::const_char_iterator aEnd,
                         const nsASingleFragmentString::const_char_iterator aSequenceStart,
                         bool &aMayIgnoreStartOfLineWhitespaceSequence,
                         bool &aSequenceStartAfterAWhiteSpace,
                         nsAString& aOutputStr)
 {
   mMayIgnoreLineBreakSequence = false;
   aMayIgnoreStartOfLineWhitespaceSequence = false;
   // Handle the complete sequence of non-whitespace in this block
   // Iterate until we find the first whitespace char or an aEnd condition
   // Updates "aPos" to point to the first unhandled char.
   // Also updates the aMayIgnoreStartOfLineWhitespaceSequence flag,
   // as well as the other "global" state flags.
   bool thisSequenceStartsAtBeginningOfLine = !mColPos;
   bool onceAgainBecauseWeAddedBreakInFront = false;
   bool foundWhitespaceInLoop;
   uint32_t length, colPos;
   do {
     if (mColPos) {
       colPos = mColPos;
     }
     else {
       if (mDoFormat && !mPreLevel && !onceAgainBecauseWeAddedBreakInFront) {
         colPos = mIndent.Length();
       }
       else
         colPos = 0;
     }
     foundWhitespaceInLoop = false;
     length = 0;
     // we iterate until the next whitespace character
     // or until we reach the maximum of character per line
     // or until the end of the string to add.
     do {
       if (*aPos == ' ' || *aPos == '\t' || *aPos == '\n') {
         foundWhitespaceInLoop = true;
         break;
       }
       ++aPos;
       ++length;
     } while ( (!mDoWrap || colPos + length < mMaxColumn) && aPos < aEnd);
     // in the case we don't reached the end of the string, but we reached the maxcolumn,
     // we see if there is a whitespace after the maxcolumn
     // if yes, then we can append directly the string instead of
     // appending a new line etc.
     if (*aPos == ' ' || *aPos == '\t' || *aPos == '\n') {
       foundWhitespaceInLoop = true;
     }
     if (aPos == aEnd || foundWhitespaceInLoop) {
       // there is enough room for the complete block we found
       if (mDoFormat && !mColPos) {
         AppendIndentation(aOutputStr);
       }
       else if (mAddSpace) {
         aOutputStr.Append(char16_t(' '));
         mAddSpace = false;
       }
       mColPos += length;
       aOutputStr.Append(aSequenceStart, aPos - aSequenceStart);
       // We have not yet reached the max column, we will continue to
       // fill the current line in the next outer loop iteration
       // (this one in AppendToStringWrapped)
       // make sure we return in this outer loop
       onceAgainBecauseWeAddedBreakInFront = false;
     }
     else { // we reach the max column
       if (!thisSequenceStartsAtBeginningOfLine &&
           (mAddSpace || (!mDoFormat && aSequenceStartAfterAWhiteSpace))) {
           // when !mDoFormat, mAddSpace is not used, mAddSpace is always false
           // so, in the case where mDoWrap && !mDoFormat, if we want to enter in this condition...
         // We can avoid to wrap. We try to add the whole block
         // in an empty new line
         AppendNewLineToString(aOutputStr);
         aPos = aSequenceStart;
         thisSequenceStartsAtBeginningOfLine = true;
         onceAgainBecauseWeAddedBreakInFront = true;
       }
       else {
         // we must wrap
         onceAgainBecauseWeAddedBreakInFront = false;
         bool foundWrapPosition = false;
         int32_t wrapPosition;
         nsILineBreaker *lineBreaker = nsContentUtils::LineBreaker();
         wrapPosition = lineBreaker->Prev(aSequenceStart,
                                          (aEnd - aSequenceStart),
                                          (aPos - aSequenceStart) + 1);
         if (wrapPosition != NS_LINEBREAKER_NEED_MORE_TEXT) {
           foundWrapPosition = true;
         }
         else {
           wrapPosition = lineBreaker->Next(aSequenceStart,
                                            (aEnd - aSequenceStart),
                                            (aPos - aSequenceStart));
           if (wrapPosition != NS_LINEBREAKER_NEED_MORE_TEXT) {
             foundWrapPosition = true;
           }
         }
         if (foundWrapPosition) {
           if (!mColPos && mDoFormat) {
             AppendIndentation(aOutputStr);
           }
           else if (mAddSpace) {
             aOutputStr.Append(char16_t(' '));
             mAddSpace = false;
           }
           aOutputStr.Append(aSequenceStart, wrapPosition);
           AppendNewLineToString(aOutputStr);
           aPos = aSequenceStart + wrapPosition;
           aMayIgnoreStartOfLineWhitespaceSequence = true;
         }
         else {
           // try some simple fallback logic
           // go forward up to the next whitespace position,
           // in the worst case this will be all the rest of the data
           // we update the mColPos variable with the length of
           // the part already parsed.
           mColPos += length;
           // now try to find the next whitespace
           do {
             if (*aPos == ' ' || *aPos == '\t' || *aPos == '\n') {
               break;
             }
             ++aPos;
             ++mColPos;
           } while (aPos < aEnd);
           if (mAddSpace) {
             aOutputStr.Append(char16_t(' '));
             mAddSpace = false;
           }
           aOutputStr.Append(aSequenceStart, aPos - aSequenceStart);
         }
       }
       aSequenceStartAfterAWhiteSpace = false;
     }
   } while (onceAgainBecauseWeAddedBreakInFront);
 }
 void
 nsXMLContentSerializer::AppendToStringFormatedWrapped(const nsASingleFragmentString& aStr,
                                                       nsAString& aOutputStr)
 {
   if (mBodyOnly && !mInBody) {
     return;
   }
   nsASingleFragmentString::const_char_iterator pos, end, sequenceStart;
   aStr.BeginReading(pos);
   aStr.EndReading(end);
   bool sequenceStartAfterAWhitespace = false;
   if (pos < end) {
     nsAString::const_char_iterator end2;
     aOutputStr.EndReading(end2);
     --end2;
     if (*end2 == ' ' || *end2 == '\n' || *end2 == '\t') {
       sequenceStartAfterAWhitespace = true;
     }
   }
   // if the current line already has text on it, such as a tag,
   // leading whitespace is significant
   bool mayIgnoreStartOfLineWhitespaceSequence =
     (!mColPos || (mIsIndentationAddedOnCurrentLine &&
                   sequenceStartAfterAWhitespace &&
                   uint32_t(mColPos) == mIndent.Length()));
   while (pos < end) {
     sequenceStart = pos;
     // if beginning of a whitespace sequence
     if (*pos == ' ' || *pos == '\n' || *pos == '\t') {
       AppendFormatedWrapped_WhitespaceSequence(pos, end, sequenceStart,
         mayIgnoreStartOfLineWhitespaceSequence, aOutputStr);
     }
     else { // any other non-whitespace char
       AppendWrapped_NonWhitespaceSequence(pos, end, sequenceStart,
         mayIgnoreStartOfLineWhitespaceSequence, sequenceStartAfterAWhitespace, aOutputStr);
     }
   }
 }
 void
 nsXMLContentSerializer::AppendWrapped_WhitespaceSequence(
                         nsASingleFragmentString::const_char_iterator &aPos,
                         const nsASingleFragmentString::const_char_iterator aEnd,
                         const nsASingleFragmentString::const_char_iterator aSequenceStart,
                         nsAString &aOutputStr)
 {
   // Handle the complete sequence of whitespace.
   // Continue to iterate until we find the first non-whitespace char.
   // Updates "aPos" to point to the first unhandled char.
   mAddSpace = false;
   mIsIndentationAddedOnCurrentLine = false;
   bool leaveLoop = false;
   nsASingleFragmentString::const_char_iterator lastPos = aPos;
   do {
     switch (*aPos) {
       case ' ':
       case '\t':
         // if there are too many spaces on a line, we wrap
         if (mColPos >= mMaxColumn) {
           if (lastPos != aPos) {
             aOutputStr.Append(lastPos, aPos - lastPos);
           }
           AppendToString(mLineBreak, aOutputStr);
           mColPos = 0;
           lastPos = aPos;
         }
         ++mColPos;
         ++aPos;
         break;
       case '\n':
         if (lastPos != aPos) {
           aOutputStr.Append(lastPos, aPos - lastPos);
         }
         AppendToString(mLineBreak, aOutputStr);
         mColPos = 0;
         ++aPos;
         lastPos = aPos;
         break;
       default:
         leaveLoop = true;
         break;
     }
   } while (!leaveLoop && aPos < aEnd);
   if (lastPos != aPos) {
     aOutputStr.Append(lastPos, aPos - lastPos);
   }
 }
 void
 nsXMLContentSerializer::AppendToStringWrapped(const nsASingleFragmentString& aStr,
                                               nsAString& aOutputStr)
 {
   if (mBodyOnly && !mInBody) {
     return;
   }
   nsASingleFragmentString::const_char_iterator pos, end, sequenceStart;
   aStr.BeginReading(pos);
   aStr.EndReading(end);
   // not used in this case, but needed by AppendWrapped_NonWhitespaceSequence
   bool mayIgnoreStartOfLineWhitespaceSequence = false;
   mMayIgnoreLineBreakSequence = false;
   bool sequenceStartAfterAWhitespace = false;
   if (pos < end && !aOutputStr.IsEmpty()) {
     nsAString::const_char_iterator end2;
     aOutputStr.EndReading(end2);
     --end2;
     if (*end2 == ' ' || *end2 == '\n' || *end2 == '\t') {
       sequenceStartAfterAWhitespace = true;
     }
   }
   while (pos < end) {
     sequenceStart = pos;
     // if beginning of a whitespace sequence
     if (*pos == ' ' || *pos == '\n' || *pos == '\t') {
       sequenceStartAfterAWhitespace = true;
       AppendWrapped_WhitespaceSequence(pos, end, sequenceStart, aOutputStr);
     }
     else { // any other non-whitespace char
       AppendWrapped_NonWhitespaceSequence(pos, end, sequenceStart,
         mayIgnoreStartOfLineWhitespaceSequence, sequenceStartAfterAWhitespace, aOutputStr);
     }
   }
 }

The Tor Browser / annotate

content/base/src/nsXMLContentSerializer.cpp@6474c204b198 (annotated)

content/base/src/nsXMLContentSerializer.cpp