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livetrax/libs/pbd/xml++.cc

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/* xml++.cc
* libxml++ and this file are copyright (C) 2000 by Ari Johnson, and
* are covered by the GNU Lesser General Public License, which should be
* included with libxml++ as the file COPYING.
* Modified for Ardour and released under the same terms.
*/
#include <iostream>
#include "pbd/xml++.h"
#include <libxml/debugXML.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
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xmlChar* xml_version = xmlCharStrdup("1.0");
using namespace std;
static XMLNode* readnode(xmlNodePtr);
static void writenode(xmlDocPtr, XMLNode*, xmlNodePtr, int);
static XMLSharedNodeList* find_impl(xmlXPathContext* ctxt, const string& xpath);
XMLTree::XMLTree()
: _filename()
, _root(0)
, _doc (0)
, _compression(0)
{
}
XMLTree::XMLTree(const string& fn, bool validate)
: _filename(fn)
, _root(0)
, _doc (0)
, _compression(0)
{
read_internal(validate);
}
XMLTree::XMLTree(const XMLTree* from)
: _filename(from->filename())
, _root(new XMLNode(*from->root()))
, _doc (xmlCopyDoc (from->_doc, 1))
, _compression(from->compression())
{
}
XMLTree::~XMLTree()
{
delete _root;
if (_doc) {
xmlFreeDoc (_doc);
}
}
int
XMLTree::set_compression(int c)
{
if (c > 9) {
c = 9;
} else if (c < 0) {
c = 0;
}
_compression = c;
return _compression;
}
bool
XMLTree::read_internal(bool validate)
{
//shouldnt be used anywhere ATM, remove if so!
assert(!validate);
delete _root;
_root = 0;
if (_doc) {
xmlFreeDoc (_doc);
_doc = 0;
}
xmlParserCtxtPtr ctxt = NULL; /* the parser context */
xmlKeepBlanksDefault(0);
/* parse the file, activating the DTD validation option */
if (validate) {
/* create a parser context */
ctxt = xmlNewParserCtxt();
if (ctxt == NULL) {
return false;
}
_doc = xmlCtxtReadFile(ctxt, _filename.c_str(), NULL, XML_PARSE_DTDVALID);
} else {
_doc = xmlParseFile(_filename.c_str());
}
/* check if parsing suceeded */
if (_doc == NULL) {
if (validate) {
xmlFreeParserCtxt(ctxt);
}
return false;
} else {
/* check if validation suceeded */
if (validate && ctxt->valid == 0) {
xmlFreeParserCtxt(ctxt);
throw XMLException("Failed to validate document " + _filename);
}
}
_root = readnode(xmlDocGetRootElement(_doc));
/* free up the parser context */
if (validate) {
xmlFreeParserCtxt(ctxt);
}
return true;
}
bool
XMLTree::read_buffer(const string& buffer)
{
xmlDocPtr doc;
_filename = "";
delete _root;
_root = 0;
doc = xmlParseMemory(const_cast<char*>(buffer.c_str()), buffer.length());
if (!doc) {
return false;
}
_root = readnode(xmlDocGetRootElement(doc));
xmlFreeDoc(doc);
return true;
}
bool
XMLTree::write() const
{
xmlDocPtr doc;
XMLNodeList children;
int result;
xmlKeepBlanksDefault(0);
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doc = xmlNewDoc(xml_version);
xmlSetDocCompressMode(doc, _compression);
writenode(doc, _root, doc->children, 1);
result = xmlSaveFormatFileEnc(_filename.c_str(), doc, "UTF-8", 1);
#ifndef NDEBUG
if (result == -1) {
xmlErrorPtr xerr = xmlGetLastError ();
if (!xerr) {
std::cerr << "unknown XML error during xmlSaveFormatFileEnc()." << std::endl;
} else {
std::cerr << "xmlSaveFormatFileEnc: error"
<< " domain: " << xerr->domain
<< " code: " << xerr->code
<< " msg: " << xerr->message
<< std::endl;
}
}
#endif
xmlFreeDoc(doc);
if (result == -1) {
return false;
}
return true;
}
void
XMLTree::debug(FILE* out) const
{
#ifdef LIBXML_DEBUG_ENABLED
xmlDocPtr doc;
XMLNodeList children;
xmlKeepBlanksDefault(0);
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doc = xmlNewDoc(xml_version);
xmlSetDocCompressMode(doc, _compression);
writenode(doc, _root, doc->children, 1);
xmlDebugDumpDocument (out, doc);
xmlFreeDoc(doc);
#endif
}
const string&
XMLTree::write_buffer() const
{
static string retval;
char* ptr;
int len;
xmlDocPtr doc;
XMLNodeList children;
xmlKeepBlanksDefault(0);
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doc = xmlNewDoc(xml_version);
xmlSetDocCompressMode(doc, _compression);
writenode(doc, _root, doc->children, 1);
xmlDocDumpMemory(doc, (xmlChar **) & ptr, &len);
xmlFreeDoc(doc);
retval = ptr;
free(ptr);
return retval;
}
XMLNode::XMLNode(const string& n)
: _name(n)
, _is_content(false)
{
}
XMLNode::XMLNode(const string& n, const string& c)
: _name(n)
, _is_content(true)
, _content(c)
{
}
XMLNode::XMLNode(const XMLNode& from)
{
*this = from;
}
XMLNode::~XMLNode()
{
clear_lists ();
}
void
XMLNode::clear_lists ()
{
XMLNodeIterator curchild;
XMLPropertyIterator curprop;
_selected_children.clear ();
_propmap.clear ();
for (curchild = _children.begin(); curchild != _children.end(); ++curchild) {
delete *curchild;
}
_children.clear ();
for (curprop = _proplist.begin(); curprop != _proplist.end(); ++curprop) {
delete *curprop;
}
_proplist.clear ();
}
XMLNode&
XMLNode::operator= (const XMLNode& from)
{
if (&from != this) {
XMLPropertyList props;
XMLPropertyIterator curprop;
XMLNodeList nodes;
XMLNodeIterator curnode;
clear_lists ();
_name = from.name();
set_content(from.content());
props = from.properties();
for (curprop = props.begin(); curprop != props.end(); ++curprop) {
add_property((*curprop)->name().c_str(), (*curprop)->value());
}
nodes = from.children();
for (curnode = nodes.begin(); curnode != nodes.end(); ++curnode) {
add_child_copy(**curnode);
}
}
return *this;
}
const string&
XMLNode::set_content(const string& c)
{
if (c.empty()) {
_is_content = false;
} else {
_is_content = true;
}
_content = c;
return _content;
}
XMLNode*
XMLNode::child (const char* name) const
{
/* returns first child matching name */
XMLNodeConstIterator cur;
if (name == 0) {
return 0;
}
for (cur = _children.begin(); cur != _children.end(); ++cur) {
if ((*cur)->name() == name) {
return *cur;
}
}
return 0;
}
const XMLNodeList&
XMLNode::children(const string& n) const
{
/* returns all children matching name */
XMLNodeConstIterator cur;
if (n.empty()) {
return _children;
}
_selected_children.clear();
for (cur = _children.begin(); cur != _children.end(); ++cur) {
if ((*cur)->name() == n) {
_selected_children.insert(_selected_children.end(), *cur);
}
}
return _selected_children;
}
XMLNode*
XMLNode::add_child(const char* n)
{
return add_child_copy(XMLNode (n));
}
void
XMLNode::add_child_nocopy(XMLNode& n)
{
_children.insert(_children.end(), &n);
}
XMLNode*
XMLNode::add_child_copy(const XMLNode& n)
{
XMLNode *copy = new XMLNode(n);
_children.insert(_children.end(), copy);
return copy;
}
boost::shared_ptr<XMLSharedNodeList>
XMLTree::find(const string xpath, XMLNode* node) const
{
xmlXPathContext* ctxt;
xmlDocPtr doc = 0;
if (node) {
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doc = xmlNewDoc(xml_version);
writenode(doc, node, doc->children, 1);
ctxt = xmlXPathNewContext(doc);
} else {
ctxt = xmlXPathNewContext(_doc);
}
boost::shared_ptr<XMLSharedNodeList> result =
boost::shared_ptr<XMLSharedNodeList>(find_impl(ctxt, xpath));
xmlXPathFreeContext(ctxt);
if (doc) {
xmlFreeDoc (doc);
}
return result;
}
std::string
XMLNode::attribute_value()
{
XMLNodeList children = this->children();
assert(!_is_content);
assert(children.size() == 1);
XMLNode* child = *(children.begin());
assert(child->is_content());
return child->content();
}
XMLNode*
XMLNode::add_content(const string& c)
{
return add_child_copy(XMLNode (string(), c));
}
XMLProperty*
XMLNode::property(const char* n)
{
string ns(n);
map<string,XMLProperty*>::iterator iter;
if ((iter = _propmap.find(ns)) != _propmap.end()) {
return iter->second;
}
return 0;
}
XMLProperty*
XMLNode::property(const string& ns)
{
map<string,XMLProperty*>::iterator iter;
if ((iter = _propmap.find(ns)) != _propmap.end()) {
return iter->second;
}
return 0;
}
XMLProperty*
XMLNode::add_property(const char* n, const string& v)
{
string ns(n);
map<string,XMLProperty*>::iterator iter;
if ((iter = _propmap.find(ns)) != _propmap.end()) {
iter->second->set_value (v);
return iter->second;
}
XMLProperty* tmp = new XMLProperty(ns, v);
if (!tmp) {
return 0;
}
_propmap[tmp->name()] = tmp;
_proplist.insert(_proplist.end(), tmp);
return tmp;
}
XMLProperty*
XMLNode::add_property(const char* n, const char* v)
{
string vs(v);
return add_property(n, vs);
}
XMLProperty*
XMLNode::add_property(const char* name, const long value)
{
char str[64];
snprintf(str, sizeof(str), "%ld", value);
return add_property(name, str);
}
void
XMLNode::remove_property(const string& n)
{
if (_propmap.find(n) != _propmap.end()) {
XMLProperty* p = _propmap[n];
_proplist.remove (p);
delete p;
_propmap.erase(n);
}
}
/** Remove any property with the given name from this node and its children */
void
XMLNode::remove_property_recursively(const string& n)
{
remove_property (n);
for (XMLNodeIterator i = _children.begin(); i != _children.end(); ++i) {
(*i)->remove_property_recursively (n);
}
}
void
XMLNode::remove_nodes(const string& n)
{
XMLNodeIterator i = _children.begin();
XMLNodeIterator tmp;
while (i != _children.end()) {
tmp = i;
++tmp;
if ((*i)->name() == n) {
_children.erase (i);
}
i = tmp;
}
}
void
XMLNode::remove_nodes_and_delete(const string& n)
{
XMLNodeIterator i = _children.begin();
XMLNodeIterator tmp;
while (i != _children.end()) {
tmp = i;
++tmp;
if ((*i)->name() == n) {
delete *i;
_children.erase (i);
}
i = tmp;
}
}
void
XMLNode::remove_nodes_and_delete(const string& propname, const string& val)
{
XMLNodeIterator i = _children.begin();
XMLNodeIterator tmp;
XMLProperty* prop;
while (i != _children.end()) {
tmp = i;
++tmp;
prop = (*i)->property(propname);
if (prop && prop->value() == val) {
delete *i;
_children.erase(i);
}
i = tmp;
}
}
XMLProperty::XMLProperty(const string& n, const string& v)
: _name(n)
, _value(v)
{
// Normalize property name (replace '_' with '-' as old session are inconsistent)
for (size_t i = 0; i < _name.length(); ++i) {
if (_name[i] == '_') {
_name[i] = '-';
}
}
}
XMLProperty::~XMLProperty()
{
}
static XMLNode*
readnode(xmlNodePtr node)
{
string name, content;
xmlNodePtr child;
XMLNode* tmp;
xmlAttrPtr attr;
if (node->name) {
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name = (const char*)node->name;
}
tmp = new XMLNode(name);
for (attr = node->properties; attr; attr = attr->next) {
content = "";
if (attr->children) {
content = (char*)attr->children->content;
}
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tmp->add_property((const char*)attr->name, content);
}
if (node->content) {
tmp->set_content((char*)node->content);
} else {
tmp->set_content(string());
}
for (child = node->children; child; child = child->next) {
tmp->add_child_nocopy (*readnode(child));
}
return tmp;
}
static void
writenode(xmlDocPtr doc, XMLNode* n, xmlNodePtr p, int root = 0)
{
XMLPropertyList props;
XMLPropertyIterator curprop;
XMLNodeList children;
XMLNodeIterator curchild;
xmlNodePtr node;
if (root) {
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node = doc->children = xmlNewDocNode(doc, 0, (const xmlChar*) n->name().c_str(), 0);
} else {
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node = xmlNewChild(p, 0, (const xmlChar*) n->name().c_str(), 0);
}
if (n->is_content()) {
node->type = XML_TEXT_NODE;
xmlNodeSetContentLen(node, (const xmlChar*)n->content().c_str(), n->content().length());
}
props = n->properties();
for (curprop = props.begin(); curprop != props.end(); ++curprop) {
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xmlSetProp(node, (const xmlChar*) (*curprop)->name().c_str(), (const xmlChar*) (*curprop)->value().c_str());
}
children = n->children();
for (curchild = children.begin(); curchild != children.end(); ++curchild) {
writenode(doc, *curchild, node);
}
}
static XMLSharedNodeList* find_impl(xmlXPathContext* ctxt, const string& xpath)
{
xmlXPathObject* result = xmlXPathEval((const xmlChar*)xpath.c_str(), ctxt);
if (!result) {
xmlXPathFreeContext(ctxt);
xmlFreeDoc(ctxt->doc);
throw XMLException("Invalid XPath: " + xpath);
}
if (result->type != XPATH_NODESET) {
xmlXPathFreeObject(result);
xmlXPathFreeContext(ctxt);
xmlFreeDoc(ctxt->doc);
throw XMLException("Only nodeset result types are supported.");
}
xmlNodeSet* nodeset = result->nodesetval;
XMLSharedNodeList* nodes = new XMLSharedNodeList();
if (nodeset) {
for (int i = 0; i < nodeset->nodeNr; ++i) {
XMLNode* node = readnode(nodeset->nodeTab[i]);
nodes->push_back(boost::shared_ptr<XMLNode>(node));
}
} else {
// return empty set
}
xmlXPathFreeObject(result);
return nodes;
}
/** Dump a node, its properties and children to a stream */
void
XMLNode::dump (ostream& s, string p) const
{
if (_is_content) {
s << p << " " << content() << "\n";
} else {
s << p << "<" << _name;
for (XMLPropertyList::const_iterator i = _proplist.begin(); i != _proplist.end(); ++i) {
s << " " << (*i)->name() << "=\"" << (*i)->value() << "\"";
}
s << ">\n";
for (XMLNodeList::const_iterator i = _children.begin(); i != _children.end(); ++i) {
(*i)->dump (s, p + " ");
}
s << p << "</" << _name << ">\n";
}
}