Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmllite/xmlprinter.cc

+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/libjingle/xmllite/xmlprinter.h"
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "webrtc/libjingle/xmllite/xmlconstants.h"
+#include "webrtc/libjingle/xmllite/xmlelement.h"
+#include "webrtc/libjingle/xmllite/xmlnsstack.h"
+
+namespace buzz {
+
+class XmlPrinterImpl {
+public:
+  XmlPrinterImpl(std::ostream* pout, XmlnsStack* ns_stack);
+  void PrintElement(const XmlElement* element);
+  void PrintQuotedValue(const std::string& text);
+  void PrintBodyText(const std::string& text);
+  void PrintCDATAText(const std::string& text);
+
+private:
+  std::ostream *pout_;
+  XmlnsStack* ns_stack_;
+};
+
+void XmlPrinter::PrintXml(std::ostream* pout, const XmlElement* element) {
+  XmlnsStack ns_stack;
+  PrintXml(pout, element, &ns_stack);
+}
+
+void XmlPrinter::PrintXml(std::ostream* pout, const XmlElement* element,
+                          XmlnsStack* ns_stack) {
+  XmlPrinterImpl printer(pout, ns_stack);
+  printer.PrintElement(element);
+}
+
+XmlPrinterImpl::XmlPrinterImpl(std::ostream* pout, XmlnsStack* ns_stack)
+    : pout_(pout),
+      ns_stack_(ns_stack) {
+}
+
+void XmlPrinterImpl::PrintElement(const XmlElement* element) {
+  ns_stack_->PushFrame();
+
+  // first go through attrs of pel to add xmlns definitions
+  const XmlAttr* attr;
+  for (attr = element->FirstAttr(); attr; attr = attr->NextAttr()) {
+    if (attr->Name() == QN_XMLNS) {
+      ns_stack_->AddXmlns(STR_EMPTY, attr->Value());
+    } else if (attr->Name().Namespace() == NS_XMLNS) {
+      ns_stack_->AddXmlns(attr->Name().LocalPart(),
+                          attr->Value());
+    }
+  }
+
+  // then go through qnames to make sure needed xmlns definitons are added
+  std::vector<std::string> new_ns;
+  std::pair<std::string, bool> prefix;
+  prefix = ns_stack_->AddNewPrefix(element->Name().Namespace(), false);
+  if (prefix.second) {
+    new_ns.push_back(prefix.first);
+    new_ns.push_back(element->Name().Namespace());
+  }
+
+  for (attr = element->FirstAttr(); attr; attr = attr->NextAttr()) {
+    prefix = ns_stack_->AddNewPrefix(attr->Name().Namespace(), true);
+    if (prefix.second) {
+      new_ns.push_back(prefix.first);
+      new_ns.push_back(attr->Name().Namespace());
+    }
+  }
+
+  // print the element name
+  *pout_ << '<' << ns_stack_->FormatQName(element->Name(), false);
+
+  // and the attributes
+  for (attr = element->FirstAttr(); attr; attr = attr->NextAttr()) {
+    *pout_ << ' ' << ns_stack_->FormatQName(attr->Name(), true) << "=\"";
+    PrintQuotedValue(attr->Value());
+    *pout_ << '"';
+  }
+
+  // and the extra xmlns declarations
+  std::vector<std::string>::iterator i(new_ns.begin());
+  while (i < new_ns.end()) {
+    if (*i == STR_EMPTY) {
+      *pout_ << " xmlns=\"" << *(i + 1) << '"';
+    } else {
+      *pout_ << " xmlns:" << *i << "=\"" << *(i + 1) << '"';
+    }
+    i += 2;
+  }
+
+  // now the children
+  const XmlChild* child = element->FirstChild();
+
+  if (child == NULL)
+    *pout_ << "/>";
+  else {
+    *pout_ << '>';
+    while (child) {
+      if (child->IsText()) {
+        if (element->IsCDATA()) {
+          PrintCDATAText(child->AsText()->Text());
+        } else {
+          PrintBodyText(child->AsText()->Text());
+        }
+      } else {
+        PrintElement(child->AsElement());
+      }
+      child = child->NextChild();
+    }
+    *pout_ << "</" << ns_stack_->FormatQName(element->Name(), false) << '>';
+  }
+
+  ns_stack_->PopFrame();
+}
+
+void XmlPrinterImpl::PrintQuotedValue(const std::string& text) {
+  size_t safe = 0;
+  for (;;) {
+    size_t unsafe = text.find_first_of("<>&\"", safe);
+    if (unsafe == std::string::npos)
+      unsafe = text.length();
+    *pout_ << text.substr(safe, unsafe - safe);
+    if (unsafe == text.length())
+      return;
+    switch (text[unsafe]) {
+      case '<': *pout_ << "&lt;"; break;
+      case '>': *pout_ << "&gt;"; break;
+      case '&': *pout_ << "&amp;"; break;
+      case '"': *pout_ << "&quot;"; break;
+    }
+    safe = unsafe + 1;
+    if (safe == text.length())
+      return;
+  }
+}
+
+void XmlPrinterImpl::PrintBodyText(const std::string& text) {
+  size_t safe = 0;
+  for (;;) {
+    size_t unsafe = text.find_first_of("<>&", safe);
+    if (unsafe == std::string::npos)
+      unsafe = text.length();
+    *pout_ << text.substr(safe, unsafe - safe);
+    if (unsafe == text.length())
+      return;
+    switch (text[unsafe]) {
+      case '<': *pout_ << "&lt;"; break;
+      case '>': *pout_ << "&gt;"; break;
+      case '&': *pout_ << "&amp;"; break;
+    }
+    safe = unsafe + 1;
+    if (safe == text.length())
+      return;
+  }
+}
+
+void XmlPrinterImpl::PrintCDATAText(const std::string& text) {
+  *pout_ << "<![CDATA[" << text << "]]>";
+}
+
+}  // namespace buzz