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//
// Copyright 2011,2014 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/property_tree.hpp>
#include <uhd/types/dict.hpp>
#include <boost/foreach.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/make_shared.hpp>
#include <iostream>
using namespace uhd;
/***********************************************************************
* Helper function to iterate through paths
**********************************************************************/
#include <boost/tokenizer.hpp>
#define path_tokenizer(path) \
boost::tokenizer<boost::char_separator<char> > \
(path, boost::char_separator<char>("/"))
/***********************************************************************
* Property path implementation wrapper
**********************************************************************/
fs_path::fs_path(void): std::string(){}
fs_path::fs_path(const char *p): std::string(p){}
fs_path::fs_path(const std::string &p): std::string(p){}
std::string fs_path::leaf(void) const{
const size_t pos = this->rfind("/");
if (pos == std::string::npos) return *this;
return this->substr(pos+1);
}
fs_path fs_path::branch_path(void) const{
const size_t pos = this->rfind("/");
if (pos == std::string::npos) return *this;
return fs_path(this->substr(0, pos));
}
fs_path uhd::operator/(const fs_path &lhs, const fs_path &rhs){
//strip trailing slash on left-hand-side
if (not lhs.empty() and *lhs.rbegin() == '/'){
return fs_path(lhs.substr(0, lhs.size()-1)) / rhs;
}
//strip leading slash on right-hand-side
if (not rhs.empty() and *rhs.begin() == '/'){
return lhs / fs_path(rhs.substr(1));
}
return fs_path(lhs + "/" + rhs);
}
/***********************************************************************
* Property tree implementation
**********************************************************************/
class property_tree_impl : public uhd::property_tree{
public:
property_tree_impl(const fs_path &root = fs_path()):
_root(root)
{
_guts = boost::make_shared<tree_guts_type>();
}
sptr subtree(const fs_path &path_) const{
const fs_path path = _root / path_;
boost::mutex::scoped_lock lock(_guts->mutex);
property_tree_impl *subtree = new property_tree_impl(path);
subtree->_guts = this->_guts; //copy the guts sptr
return sptr(subtree);
}
void remove(const fs_path &path_){
const fs_path path = _root / path_;
boost::mutex::scoped_lock lock(_guts->mutex);
node_type *parent = NULL;
node_type *node = &_guts->root;
BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
if (not node->has_key(name)) throw_path_not_found(path);
parent = node;
node = &(*node)[name];
}
if (parent == NULL) throw uhd::runtime_error("Cannot uproot");
parent->pop(fs_path(path.leaf()));
}
bool exists(const fs_path &path_) const{
const fs_path path = _root / path_;
boost::mutex::scoped_lock lock(_guts->mutex);
node_type *node = &_guts->root;
BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
if (not node->has_key(name)) return false;
node = &(*node)[name];
}
return true;
}
std::vector<std::string> list(const fs_path &path_) const{
const fs_path path = _root / path_;
boost::mutex::scoped_lock lock(_guts->mutex);
node_type *node = &_guts->root;
BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
if (not node->has_key(name)) throw_path_not_found(path);
node = &(*node)[name];
}
return node->keys();
}
void _create(const fs_path &path_, const boost::shared_ptr<void> &prop){
const fs_path path = _root / path_;
boost::mutex::scoped_lock lock(_guts->mutex);
node_type *node = &_guts->root;
BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
if (not node->has_key(name)) (*node)[name] = node_type();
node = &(*node)[name];
}
if (node->prop.get() != NULL) throw uhd::runtime_error("Cannot create! Property already exists at: " + path);
node->prop = prop;
}
boost::shared_ptr<void> &_access(const fs_path &path_) const{
const fs_path path = _root / path_;
boost::mutex::scoped_lock lock(_guts->mutex);
node_type *node = &_guts->root;
BOOST_FOREACH(const std::string &name, path_tokenizer(path)){
if (not node->has_key(name)) throw_path_not_found(path);
node = &(*node)[name];
}
if (node->prop.get() == NULL) throw uhd::runtime_error("Cannot access! Property uninitialized at: " + path);
return node->prop;
}
private:
void throw_path_not_found(const fs_path &path) const{
throw uhd::lookup_error("Path not found in tree: " + path);
}
//basic structural node element
struct node_type : uhd::dict<std::string, node_type>{
boost::shared_ptr<void> prop;
};
//tree guts which may be referenced in a subtree
struct tree_guts_type{
node_type root;
boost::mutex mutex;
};
//members, the tree and root prefix
boost::shared_ptr<tree_guts_type> _guts;
const fs_path _root;
};
property_tree::~property_tree(void){
/* NOP */
}
/***********************************************************************
* Property tree factory
**********************************************************************/
uhd::property_tree::sptr uhd::property_tree::make(void){
return sptr(new property_tree_impl());
}
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