TreeUtils.h

/*
 
MIT License
 
Copyright (c) 2017 FMI Open Development / Markus Peura, first.last@fmi.fi
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
/*
Part of Rack development has been done in the BALTRAD projects part-financed
by the European Union (European Regional Development Fund and European
Neighbourhood Partnership Instrument, Baltic Sea Region Programme 2007-2013)
*/
 
// TODO: check
#ifndef DRAIN_TREE_UTILS
#define DRAIN_TREE_UTILS "2.1"
 
#include <string>
 
#include <drain/Log.h>
 
namespace drain {
 
 
 
 
class TreeUtils {
 
public:
 
 
    template <class TR, class S>
    static
    void getPaths(const TR & tree, S & container){
        for (const auto & entry: tree){
            typename TR::path_t p;
            p << entry.first;
            getPaths(entry.second, container, p); // recursion
        };
    }
 
 
    template <class TR, class S>
    static
    void getPaths(const TR & tree, S & container, const typename TR::path_t & path){ // consider empty() and checking empty
        container.push_back(path);
        for (const auto & entry: tree){
                //for (typename container_t::const_iterator it = begin(); it != end(); ++it){
            typename TR::path_t p = path;
            p << entry.first;
            getPaths(entry.second, container, p); // recursion
        };
    }
 
    template <class T1, class T2>
    static
    void deepCopy(const T1 & srcTree, T2 & dstTree){
 
        for (const auto & entry: srcTree){
            deepCopy(entry.second, dstTree.addChild(entry.first));
        };
 
        if (dstTree.empty() || !dstTree.isExclusive())
            dstTree.data = srcTree.data;
 
    }
 
 
 
 
    template <class T, class H>
    static void traverse(H & visitor, T & tree, const typename T::path_t & path = typename T::path_t()){
 
        if (visitor.visitPrefix(tree, path)){
            return;
        }
 
 
        // Recursion
        for (auto & entry: tree(path).getChildren()){
            // NOTICE: tree stays intact, path expands...
            traverse(visitor, tree, typename T::path_t(path, entry.first));
        }
 
        if (visitor.visitPostfix(tree, path)){
            // What to do? Not much commands below ...
        }
 
 
    }
 
 
    template <class T>
    static
    bool dataDumper(const T & data, std::ostream &ostr){
        ostr << data << ' ';
        return true;
    }
 
 
    template <class TR, bool SKIP_EMPTY=false>
    static
    bool dump(const TR & tree, std::ostream &ostr = std::cout,
            bool (* callBack)(const typename TR::node_data_t &, std::ostream &) = TreeUtils::dataDumper, const std::string & indent="") { // int depth = 0) const {
 
        // https://www.w3.org/TR/xml-entity-names/025.html
        /*
        static const std::string EMPTY(" ");
        static const std::string VERT("│");
        static const std::string VERT_RIGHT("├");
        static const std::string UP_RIGHT("└");
        static const std::string HORZ("─");
        static const std::string HORZ_DOWN("┬");
        */
 
        bool empty = true;
 
        if (callBack != nullptr){
            if (! (tree.isExclusive() && tree.hasChildren())){
                // if (tree.empty()){
                empty = (*callBack)(tree.data, ostr);
            }
        }
        ostr << '\n';
 
        for (typename TR::container_t::const_iterator it = tree.begin(); it != tree.end(); it++){
 
            if (it->second.empty()){
                continue;
            }
 
            std::ostream & ostrChild = ostr; // for now...
 
            std::string indent2;
            if (it == --tree.end()){
                ostrChild   << indent << "└──"; // UP_RIGHT << HORZ << HORZ; // "'––";
                indent2      = indent  + "   "; // EMPTY  + EMPTY + EMPTY;   // "   ";
            }
            else {
                ostrChild   << indent << "├──"; // VERT_RIGHT << HORZ << HORZ; // "¦––";
                indent2      = indent  + "│  "; // VERT + EMPTY + EMPTY; // "|  ";
            }
            ostrChild << it->first; // << '\n'; //' ' << depth << '\n';
 
            if (callBack != nullptr){
                ostrChild << ' ';
            }
 
            // dump(entry.second, ostr, nodes, indent2);
            bool empty2 = dump(it->second, ostrChild, callBack, indent2);
 
            if (!empty2)
                empty = false;
 
        };
 
        return empty;
 
    }
 
    template <class TR>
    static
    void dumpContents(const TR & tree, std::ostream &ostr = std::cout, const typename TR::path_t & path = "") {
        ostr << path << '=';
        ostr << tree.data << '\n';
        for (const auto & entry: tree){
            ostr << entry.first << '\t';  // UNIMPLEMENTED: recursion?
            dumpContents(entry.second, ostr); //, path+"/"+it->first);
        };
    }
 
    // TODO: move to TreeUtils, Sprinter-like?
    template <class TR>
    static inline
    void writeINI(const TR & t, std::ostream & ostr = std::cout, const typename TR::path_t & prefix = typename TR::path_t()){
        drain::Logger mout(__FILE__, __FUNCTION__);
        mout.unimplemented("future extension");
    }
 
 
 
    template <class TR>
    static inline
    void readINI(TR & tree, std::istream & istr){
        drain::Logger mout(__FILE__, __FUNCTION__);
        mout.unimplemented("future extension");
    }
 
 
};
 
 
 
template <class T>
class TreeVisitor {
 
public:
 
    inline
    TreeVisitor(){};
 
    virtual inline
    ~TreeVisitor(){};
 
    virtual inline
    int visitPrefix(T & tree, const typename T::path_t & path){
        return 0;
    }
 
    virtual inline
    int visitPostfix(T & tree, const typename T::path_t & path){
        return 0;
    }
 
};
 
 
 
 
#ifdef DRAIN_TYPENAME
DRAIN_TYPENAME(TreeUtils);
#endif
 
 
} // drain::
 
#endif