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 <cstddef> // nullptr
#include <iterator>
#include <string>
#include <map>
 
#include <drain/Log.h>
#include <drain/String.h>
#include "Path.h"
 
namespace drain {
 
 
 
 
class TreeUtils {
public:
 
 
 
 
 
 
 
    template <class TR>
    static
    void erase(TR & tree, const typename TR::path_t & path){ // RAISE/virtualize
 
        drain::Logger mout(__FILE__, __FUNCTION__);
        mout.unimplemented("consider: tree(", path, ").clear()");
        /*
        typename path_t::const_iterator it = path.end();
        if (it == path.begin())
            return;
        else {
            --it;
            // Now 'it' points to the leaf
            if (it == path.begin()) // path size = 1 (direct child path)
                children.erase(*it);
            else { // path size > 1
                tree_t & parent = this->get(path.begin(), it);
                parent.children.erase(*it);
            }
        }
        */
    }
 
 
    template <class TR, class S>
    static
    void getPaths(const TR & tree, S & container){
        //const path_t prefix(separator);
        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){
        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 & handler, T & tree, const typename T::path_t & path = typename T::path_t()){
 
        if (handler.visitPrefix(tree, path)){
            // std::cout << "SKIP: " << path << ':'  << '\n'; // << tree(path).data
            return;
        }
        // std::cout << "OK:   " << path << ':'  << '\n'; // << tree(path).data
 
 
        // Recursion
        for (auto & entry: tree(path).getChildren()){
            //const typename T::path_t p(path, entry.first);
            //traverse(handler, entry.second, p);
            // NOTICE: tree stays intact, path expands...
            traverse(handler, tree, typename T::path_t(path, entry.first));
        }
 
        if (handler.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
    //void dump(const TR & tree, std::ostream &ostr = std::cout, bool nodes=false, const std::string &  indent="") { // int depth = 0) const {
    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 (nodes){
        if (callBack != nullptr){ // nodes){
            // std::stringstream sstr;
            if (tree.empty() || !tree.isExclusive()){
                // if (empty || !tree.isExclusive()){
                empty = (*callBack)(tree.data, ostr);
                //if (sstr.LENGTH)
                // ostr << sstr.str(); // See Logger for direct copy? Risk: pending
                // ostr << tree.data;
            }
        }
        ostr << '\n';
 
        // for (const auto & entry: *this){
        // for (const auto & entry: tree.begin()){
        for (typename TR::container_t::const_iterator it = tree.begin(); it != tree.end(); it++){
 
            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){ // nodes){
                //ostr << ':';
                ostrChild << ' ';
            }
 
            // dump(entry.second, ostr, nodes, indent2);
            bool empty2 = dump(it->second, ostrChild, callBack, indent2);
 
            if (!empty2)
                empty = false;
 
            //if (!(empty2 && SKIP_EMPTY))
            // if ((empty2 && SKIP_EMPTY)) ostr << "{\n";
            // ostr << sstr.str();
            //if ((empty2 && SKIP_EMPTY)) ostr << "}\n";
        };
 
        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");
    }
 
 
};
 
 
 
/*
 
void JSONtree::writeINI(const tree_t & t, std::ostream & ostr, const tree_t::path_t & prefix){
 
    //for (tree_t::node_t::const_iterator dit = t.data.begin(); dit != t.data.end(); ++dit){
    for (const auto & entry: t.data){
        ostr << entry.first << '='; // << dit->second;
        Sprinter::toStream(ostr, entry.second, Sprinter::jsonLayout);
        // entry.second.valueToJSON(ostr);
        ostr << '\n';
    }
    ostr << '\n';
 
 
    // Traverse children (only)
    for (tree_t::const_iterator it = t.begin(); it != t.end(); ++it){
 
        tree_t::path_t path(prefix);
        path << it->first;
 
        ostr << '[' << path << ']' << '\n';
 
        writeINI(it->second, ostr, path);
 
        ostr << '\n';
 
    }
 
}
*/
 
 
#ifdef DRAIN_TYPE_UTILS
/*
template <>
struct TypeName<TreeUtils> {
    static const char* get(){
        return "SuperTree";
    }
};
*/
#endif
 
 
} // drain::
 
#endif