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livetrax/libs/pbd/xml++.cc
Carl Hetherington 4e1f451520 Remove unnecessary 0 checks before delete; see http://www.parashift.com/c++-faq-lite/freestore-mgmt.html#faq-16.8 Apologies for the big commit.
git-svn-id: svn://localhost/ardour2/branches/3.0@4332 d708f5d6-7413-0410-9779-e7cbd77b26cf
2008-12-18 19:31:00 +00:00

591 lines
11 KiB
C++

/* 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.
*/
#include <pbd/xml++.h>
#include <libxml/debugXML.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#define XML_VERSION "1.0"
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),
_compression(0)
{
}
XMLTree::XMLTree(const string &fn, bool validate)
: _filename(fn),
_root(0),
_compression(0)
{
read_internal(validate);
}
XMLTree::XMLTree(const XMLTree * from)
{
_filename = from->filename();
_root = new XMLNode(*from->root());
_compression = from->compression();
}
XMLTree::~XMLTree()
{
delete _root;
}
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;
xmlParserCtxtPtr ctxt; /* the parser context */
xmlDocPtr doc; /* the resulting document tree */
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);
xmlFreeDoc(doc);
xmlCleanupParser();
throw XMLException("Failed to validate document " + _filename);
}
}
_root = readnode(xmlDocGetRootElement(doc));
/* free up the parser context */
if(validate) {
xmlFreeParserCtxt(ctxt);
}
xmlFreeDoc(doc);
xmlCleanupParser();
return true;
}
bool
XMLTree::read_buffer(const string & buffer)
{
xmlDocPtr doc;
_filename = "";
delete _root;
_root = 0;
doc = xmlParseMemory((char *) buffer.c_str(), buffer.length());
if (!doc) {
return false;
}
_root = readnode(xmlDocGetRootElement(doc));
xmlFreeDoc(doc);
return true;
}
bool
XMLTree::write(void) const
{
xmlDocPtr doc;
XMLNodeList children;
int result;
xmlKeepBlanksDefault(0);
doc = xmlNewDoc((xmlChar *) XML_VERSION);
xmlSetDocCompressMode(doc, _compression);
writenode(doc, _root, doc->children, 1);
result = xmlSaveFormatFileEnc(_filename.c_str(), doc, "UTF-8", 1);
xmlFreeDoc(doc);
if (result == -1) {
return false;
}
return true;
}
void
XMLTree::debug(FILE* out) const
{
xmlDocPtr doc;
XMLNodeList children;
xmlKeepBlanksDefault(0);
doc = xmlNewDoc((xmlChar *) XML_VERSION);
xmlSetDocCompressMode(doc, _compression);
writenode(doc, _root, doc->children, 1);
xmlDebugDumpDocument (out, doc);
xmlFreeDoc(doc);
}
const string &
XMLTree::write_buffer(void) const
{
static string retval;
char *ptr;
int len;
xmlDocPtr doc;
XMLNodeList children;
xmlKeepBlanksDefault(0);
doc = xmlNewDoc((xmlChar *) 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), _content(string())
{
}
XMLNode::XMLNode(const string & n, const string & c)
:_name(n), _is_content(true), _content(c)
{
}
XMLNode::XMLNode(const XMLNode& from)
{
XMLPropertyList props;
XMLPropertyIterator curprop;
XMLNodeList nodes;
XMLNodeIterator curnode;
_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);
}
}
XMLNode::~XMLNode()
{
XMLNodeIterator curchild;
XMLPropertyIterator curprop;
for (curchild = _children.begin(); curchild != _children.end(); ++curchild) {
delete *curchild;
}
for (curprop = _proplist.begin(); curprop != _proplist.end(); ++curprop) {
delete *curprop;
}
}
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>
XMLNode::find(const string xpath) const
{
xmlDocPtr doc = xmlNewDoc((xmlChar *) XML_VERSION);
writenode(doc, (XMLNode *) this, doc->children, 1);
xmlXPathContext* ctxt = xmlXPathNewContext(doc);
boost::shared_ptr<XMLSharedNodeList> result =
boost::shared_ptr<XMLSharedNodeList>(find_impl(ctxt, xpath));
xmlXPathFreeContext(ctxt);
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);
if(_propmap.find(ns) != _propmap.end()){
remove_property(ns);
}
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)
{
static char str[1024];
snprintf(str, 1024, "%ld", value);
return add_property(name, str);
}
void
XMLNode::remove_property(const string & n)
{
if (_propmap.find(n) != _propmap.end()) {
_proplist.remove(_propmap[n]);
_propmap.erase(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) {
name = (char *) node->name;
}
tmp = new XMLNode(name);
for (attr = node->properties; attr; attr = attr->next) {
content = "";
if (attr->children) {
content = (char *) attr->children->content;
}
tmp->add_property((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) {
node = doc->children = xmlNewDocNode(doc, 0, (xmlChar *) n->name().c_str(), 0);
} else {
node = xmlNewChild(p, 0, (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) {
xmlSetProp(node, (xmlChar *) (*curprop)->name().c_str(), (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;
}