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deserializer.cpp
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deserializer.cpp
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/**
* @file
*
* @brief deserialization implementation for xerces plugin
*
* @copyright BSD License (see LICENSE.md or https://www.libelektra.org)
*/
#include "deserializer.hpp"
#include "util.hpp"
#include <xercesc/dom/DOM.hpp>
#include <xercesc/dom/DOMAttr.hpp>
#include <xercesc/dom/DOMDocument.hpp>
#include <xercesc/dom/DOMImplementation.hpp>
#include <xercesc/dom/DOMNode.hpp>
#include <xercesc/parsers/XercesDOMParser.hpp>
#include <algorithm>
#include <iostream>
#include <locale>
#include <map>
#include <kdbease.h>
#include <kdblogger.h>
#include <key.hpp>
XERCES_CPP_NAMESPACE_USE
using namespace std;
using namespace kdb;
using namespace xerces;
namespace
{
XercesPtr<DOMDocument> doc2dom (std::string const & src)
{
XercesDOMParser parser;
parser.setValidationScheme (XercesDOMParser::Val_Auto);
parser.parse (asXMLCh (src));
return XercesPtr<DOMDocument> (parser.adoptDocument ());
}
string trim (string const & str)
{
stringstream ss (str);
string to;
string trimmed;
while (getline (ss, to, '\n'))
{
// Remove whitespace lines, most likely caused by pretty printing
if (!all_of (to.begin (), to.end (), [] (char c) { return isspace (c, locale ()); })) trimmed += to;
}
return trimmed;
}
string getElementText (DOMNode const * parent)
{
string str;
for (auto child = parent->getFirstChild (); child != NULL; child = child->getNextSibling ())
{
if (DOMNode::NodeType::TEXT_NODE == child->getNodeType () || DOMNode::NodeType::CDATA_SECTION_NODE == child->getNodeType ())
{
DOMText * data = dynamic_cast<DOMText *> (child);
if (!data->getIsElementContentWhitespace ()) str += toStr (data->getData ());
}
}
// Trim whitespace that is most likely due to pretty printing
return trim (str);
}
Key newNodeKey (Key const & parent, DOMNode const * node)
{
Key childKey (parent.getName (), KEY_END);
const string keyName = toStr (node->getNodeName ());
childKey.addBaseName (keyName);
return childKey;
}
void node2key (DOMNode const * n, Key const & parent, KeySet const & ks, Key & current)
{
const string keyName = toStr (n->getNodeName ());
ELEKTRA_LOG_DEBUG ("Encountered Element: %s with parent %s", keyName.c_str (), current.getName ().c_str ());
if (!ks.size ())
{ // we map the parent key to the xml root element
// preserve the original name if it is different
auto parentName = parent.rbegin ();
if (parentName != parent.rend () && (*parentName) != keyName)
{
ELEKTRA_LOG_DEBUG ("parent name %s differs from root element name %s", (*parentName).c_str (), keyName.c_str ());
current.setMeta (ELEKTRA_XERCES_ORIGINAL_ROOT_NAME, keyName);
}
}
else
current.addBaseName (keyName);
const string text = getElementText (n);
current.set<string> (text);
if (!current.isValid ()) throw XercesPluginException ("Given keyset contains invalid keys to serialize");
ELEKTRA_LOG_DEBUG ("new parent is %s with value %s", current.getName ().c_str (), current.get<string> ().c_str ());
if (n->hasAttributes ())
{
// get all the attributes of the node
DOMNamedNodeMap * pAttributes = n->getAttributes ();
const XMLSize_t nSize = pAttributes->getLength ();
ELEKTRA_LOG_DEBUG ("\tAttributes");
for (XMLSize_t i = 0; i < nSize; ++i)
{
DOMAttr * pAttributeNode = dynamic_cast<DOMAttr *> (pAttributes->item (i));
ELEKTRA_LOG_DEBUG ("\t%s=%s", asCStr (pAttributeNode->getName ()), asCStr (pAttributeNode->getValue ()));
current.setMeta (toStr (pAttributeNode->getName ()), toStr (pAttributeNode->getValue ()));
}
}
}
void analyzeMultipleElements (DOMNode const * n, Key const & current, map<Key, bool> & arrays)
{
for (auto child = n->getFirstChild (); child != 0; child = child->getNextSibling ())
{
Key childKey = newNodeKey (current, child);
auto it = arrays.find (childKey);
if (it != arrays.end ())
{
if (!it->second)
{
ELEKTRA_LOG_DEBUG ("There are multiple elements of %s, mapping this as an array",
childKey.getName ().c_str ());
arrays[childKey] = true;
}
}
else
arrays[childKey] = false;
}
}
Key newArrayKey (Key const & arrayKey, KeySet & ks)
{
KeySet result (elektraArrayGet (arrayKey.getKey (), ks.getKeySet ()));
if (!result.size ())
{
Key arrayBaseKey = arrayKey.dup ();
Key parentArrayKey = Key (arrayKey.getName (), KEY_END);
parentArrayKey.setMeta ("array", "empty");
ks.append (parentArrayKey);
arrayBaseKey.addBaseName ("#");
result.append (arrayBaseKey);
}
return elektraArrayGetNextKey (result.getKeySet ());
}
void dom2keyset (DOMNode const * n, Key const & parent, KeySet & ks, map<Key, bool> & arrays)
{
if (n)
{
Key current (parent.getName (), KEY_END);
if (n->getNodeType () == DOMNode::ELEMENT_NODE)
{
node2key (n, parent, ks, current);
auto it = arrays.find (current);
const bool array = it != arrays.end () && it->second;
string parentArrayName = current.getName ();
// Multiple elements with that name, map as an array
if (array) current.addBaseName (newArrayKey (current, ks).getBaseName ());
// Only add keys with a value, attributes or leafs or the root to preserve the original name or array keys
if (n->hasAttributes () || !current.getString ().empty () || !n->getFirstChild () || !ks.size () || array)
{
ELEKTRA_LOG_DEBUG ("adding %s", current.getName ().c_str ());
if (array)
{
Key parentArrayKey = ks.lookup (parentArrayName);
parentArrayKey.setMeta ("array", current.getBaseName ());
}
ks.append (current);
}
else
{
ELEKTRA_LOG_DEBUG ("skipping %s", current.getName ().c_str ());
}
}
// the first level cannot have more children so its enough to check that here
analyzeMultipleElements (n, current, arrays);
for (auto child = n->getFirstChild (); child != 0; child = child->getNextSibling ())
dom2keyset (child, current, ks, arrays);
}
}
} // namespace
void xerces::deserialize (Key const & parentKey, KeySet & ks)
{
if (!parentKey.isValid ()) throw XercesPluginException ("Parent key is invalid");
if (parentKey.get<string> ().empty ()) throw XercesPluginException ("No source file specified as key value");
ELEKTRA_LOG_DEBUG ("deserializing relative to %s from file %s", parentKey.getName ().c_str (), parentKey.get<string> ().c_str ());
auto document = doc2dom (parentKey.get<string> ());
map<Key, bool> arrays;
if (document) dom2keyset (document->getDocumentElement (), parentKey, ks, arrays);
}