FlagBase.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)
*/
 
#ifndef DRAIN_FLAG_BASE
#define DRAIN_FLAG_BASE
 
#include <iostream>
#include <list>
#include <iterator>
#include <iostream>
#include <list>
#include <sstream>
#include <stdexcept>
#include <typeinfo>
 
#include <drain/Log.h>
#include <drain/StringTools.h>
#include <drain/Dictionary.h>
#include <drain/TypeName.h>
 
namespace drain {
 
 
class FlagResolver {
 
public:
 
    // Definite
    typedef std::string  key_t;
 
    // "Recommended" storage type for both numeric and enumerated-type flags.
    typedef unsigned long int ivalue_t;
 
    typedef drain::Dictionary<key_t,ivalue_t> dict_t;
 
    static
    const ivalue_t ALL; // = std::numeric_limits<FlagResolver::ivalue_t>::max();
 
 
 
    // Consider: lenient: if true, bypasses unknown keys silently, otherwise throws exception
    // Consider: FLAG for keys only, and for numerics throw exception
    template <typename T>
    static
    ivalue_t getIntValue(const drain::Dictionary<key_t,T> & dict, const std::string & keys, char separator=',');
 
    template <typename T>
    static
    std::string getKeys(const drain::Dictionary<key_t,T> & dict, ivalue_t, char separator=',');
 
    template <typename T>
    static
    std::ostream & keysToStream(const drain::Dictionary<key_t,T> &dict, ivalue_t value, std::ostream & ostr, char separator=',');
 
 
    template <typename T, typename V>
    static
    void valuesToList(ivalue_t value, const drain::Dictionary<key_t,T> &dict, std::list<V> & container);
 
 
    template <typename T>
    static
    ivalue_t addEntry(drain::Dictionary<key_t,T> & dict, const key_t & key, ivalue_t i=0);
 
 
 
    template <typename T>
    static
    ivalue_t getFreeBit(const drain::Dictionary<key_t,T> & dict);
 
 
};
 
 
template <typename T>
typename FlagResolver::ivalue_t FlagResolver::getFreeBit(const drain::Dictionary<key_t,T> & dict){
 
    drain::Logger mout(__FILE__, __FUNCTION__);
 
    // Bit mask containing all the values.
    ivalue_t currentMask = 0;
    for (const auto & entry: dict){
        currentMask = currentMask | entry.second;
    }
 
    mout.debug2("sum:" , currentMask );
 
    ivalue_t i = 1;
    while ((i&currentMask) > 0){
        mout.debug3("checking bit:" , i , " vs.\t" , currentMask );
        //full = (full>>1);
        i = (i<<1);
    }
    /*
    while (full>0){
        mout.debug2("checking bit:" , i , " vs.\t" , full );
        full = (full>>1);
        i = (i<<1);
    }
    */
 
    mout.debug("released: " , i );
 
    return i;
 
}
 
/*
template <typename T>
typename FlagResolver::ivalue_t FlagResolver::addEntry(drain::Dictionary<key_t,T> &dict, const typename dict_t::key_t & key){
 
    drain::Logger mout(__FILE__, __FUNCTION__);
    if (dict.hasKey(key)){
        mout.info(key , " already in dict: " , dict );
        return dict.getValue(key);
    }
 
    return addEntry(dict, key, )
}
*/
 
template <typename T>
typename FlagResolver::ivalue_t FlagResolver::addEntry(drain::Dictionary<key_t,T> &dict, const typename dict_t::key_t & key, ivalue_t i){
 
    drain::Logger mout(__FILE__, __FUNCTION__);
 
    if (dict.hasKey(key)){
        mout.info(key , " already in dict: " , dict );
        return dict.getValue(key);
    }
 
    if (i==0)
        i = getFreeBit(dict);
 
    if (i>0){
        dict.add(key, i);
    }
    else {
        mout.warn(key , " could not get a valid (non-zero) bit flag for dict: " , dict );
    }
 
    return i;
};
 
 
template <typename T>
typename FlagResolver::ivalue_t FlagResolver::getIntValue(const drain::Dictionary<key_t,T> & dict, const std::string & args, char separator){
 
    drain::Logger mout(__FILE__, __FUNCTION__);
 
    FlagResolver::ivalue_t v = 0;
 
    std::list<key_t> keys;
 
    if (!separator){
        separator = dict.separator;
    }
 
    if (separator){
        //drain::
        // StringTools foo;
        StringTools::split(args, keys, separator);
    }
 
 
    for (const key_t & key: keys){
 
        if (key == ""){
            continue;
        }
        else if (key == "0"){
            v = 0; // TODO if resets and sets?
            continue;
        }
        // mout.warn(" '" , *it , "'" );
 
        //typename dict_t::const_iterator dit = dict.findByKey(key);
        typename drain::Dictionary<key_t,T>::const_iterator dit = dict.findByKey(key);
 
        if (dit != dict.end()){ // String key match,
            // Numeric value for an alphabetic key was found
            v = (v | static_cast<FlagResolver::ivalue_t>(dit->second) );
        }
        else {
            // Numeric value
            FlagResolver::ivalue_t x = 0;
            std::stringstream sstr(key);
            sstr >> x; // FIX if empty
            if (x == 0){
                // String "0" handled already above
                // Consider: could advice keys only: sprinter(dict.getKeys()
                // Or key-value pairs: sprinter(dict)
                // static const SprinterLayout cmdArgLayout = {",", "?", "=", ""};
                // mout.error("key '", key, "' not found in: ", sprinter(dict, Sprinter::cmdLineLayout));
                // mout.error("key '", key, "' not föund in: ", sprinter(dict.getContainer(), cmdArgLayout) );
                mout.error("key '", key, "' not found in: ", dict);
                //throw std::runtime_error(key, ": key not found in Flags, dict: ", dict);
            }
            v = v | x;
            // Nice to know
            /*
            dict_t::const_iterator vit = dictionaryRef.findByValue(v);
            if (vit != dictionaryRef.end()){
                std::cout << "(assigned key '" << vit->second << "')\n"; // or vit->first?
            }
            */
        }
    }
 
    return v;
}
 
 
template <typename T>
std::string FlagResolver::getKeys(const drain::Dictionary<key_t,T> &dict, ivalue_t v, char separator){
    std::stringstream sstr;
    keysToStream(dict, v, sstr, separator);
    return sstr.str();
}
 
 
 
//
 
template <typename T>
std::ostream & FlagResolver::keysToStream(const drain::Dictionary<FlagResolver::key_t,T> &dict, ivalue_t value, std::ostream & ostr, char separator) {
 
    /* note: instead of shifting bits of this->value, traverses the dictionary which can contain
        - combined values
        - repeated values (aliases)
    */
 
    if (!separator)
        separator = dict.separator;
 
    char sep = 0;
 
    for (const auto & entry: dict){
        const ivalue_t v = (entry.second); // static_cast<ivalue_t>
        //if ((entry.second > 0) && ((entry.second & value) == entry.second)){ // fully covered in value
        //if ((entry.second == 0) && ((entry.second & value) == entry.second)){ // fully covered in value
        if ((v > 0) && ((v & value) == v)){ // fully covered in value
            if (sep)
                ostr <<  sep;// "{" << (int)(sep) << "}" <<
            else
                sep = separator;
            ostr << entry.first;
        }
        else {
 
        }
    }
 
    return ostr;
}
 
 
 
 
template <typename T, typename V>
void FlagResolver::valuesToList(ivalue_t value, const drain::Dictionary<key_t,T> &dict, std::list<V> & container){
    for (const auto & entry: dict){
        if ((entry.second > 0) && ((entry.second & value) == entry.second)){ // fully covered in value
            // ostr << entry.first;
            container.push_back(static_cast<V>(entry.second));
            // container.push_back(entry.first);
        }
    }
}
 
 
 
// NEW 2022/2023
 
 
// typedef drain::Dictionary<std::string,unsigned long> FlaggerDict;
 
// #define FlaggerDict FlagResolver::dict_t
 
template <typename E=std::size_t, typename T=E> //, typename D=drain::Dictionary<std::string,unsigned long> >
class  FlaggerBase {
 
public:
 
    //static
    //const SprinterLayout dictLayout = {",", "?", "=", ""};
 
    // Manifested numeric type (enum or unsigned integer)
    typedef E value_t;
    typedef T storage_t;
    typedef Dictionary<std::string,E> dict_t;
    typedef typename dict_t::key_t key_t; // ~string
 
    // Practical "storage" value
    // typedef typename dict_t::value_t dict_value_t;  // TODO: xould be same as value_t ?
 
    // Rember to add an initialized unit: template<> SingleFlagger<...>::dict = {{...,...}, ...}
    // static const dict_t dict;
 
protected:
    // Default constructor. Local value \c ownValue will be used.
    inline
    FlaggerBase(char separator=','): value(ownValue), separator(','), ownValue((storage_t)0){ // drain::NEUTRAL VALUE!
    }
 
 
    inline
    FlaggerBase(storage_t & v, char separator=','): value(v), separator(','){
    }
 
    /*  Risky? (Ambiguous)
    inline
    FlaggerBase(const dict_value_t & v): value(ownValue), ownValue(v) {
    }
    */
 
    virtual inline
    ~FlaggerBase(){
    }
 
public:
 
 
    virtual
    const dict_t & getDict() const = 0;
 
    virtual inline
    void reset(){
        this->value = storage_t(0); // ALERT! enums need neutral value.
    };
 
 
 
    virtual
    bool isSet(const storage_t & x) const = 0;
 
 
    inline
    bool isSet(const key_t & key) const {
        return isSet(getDict().getValue(key));
    };
 
    inline
    const storage_t & getValue() const {
        return value;
    }
 
 
    inline
    operator const storage_t & () const {  // should be ivalue ?
        return this->value;
    }
 
    inline
    operator storage_t & () { // should be ivalue ?
        return this->value;
    }
 
    inline
    operator bool() const {
        return static_cast<FlagResolver::ivalue_t>(this->value) != 0;
    }
 
 
    virtual
    const key_t & str() const = 0;
 
    // String
    operator const key_t & () const {
        return str();
    }
 
    // Own or external value.
    storage_t & value;
 
    char separator;
 
    void debug(std::ostream & ostr) const;
 
    /* these apply to SingleFlaggers */
    /*
    virtual inline
    void set(const key_t & key){
        if (key.empty())
            return;  // needed?
        assign(key); // potential problem: assign assumes string arg
    }
 
    virtual inline
    void set(const value_t & value){
        this->value = value;
    };
 
    virtual inline
    void set(const FlaggerBase<E> & flagger){
        this->value = flagger.value;
    }
    */
 
protected:
 
private:
 
    // protect?
    virtual
    void assign(const std::string & s) = 0;
 
 
    // Own value, discarded if external value referenced.
    storage_t ownValue = 0;  // NEUTRAL
 
};
 
 
template <typename E,typename T>
void drain::FlaggerBase<E,T>::debug(std::ostream & ostr) const {
    //ostr << typeid(drain::FlaggerBase<E>).name() << ": value=" << getValue() << ", ";
    ostr << drain::TypeName<E>::str() << ": value=" << getValue() << ", ";
    FlagResolver::keysToStream(getDict(), getValue(), ostr) << ", ";
    ostr <<  " dict: " << getDict();
}
 
template <typename E,typename T>
inline
std::ostream & operator<<(std::ostream & ostr, const drain::FlaggerBase<E,T> & flagger) {
    return ostr << flagger.str(); // flags.keysToStream(ostr);
}
 
/*
template <typename E>
const SprinterLayout drain::FlaggerBase<E>::dictLayout = {",", "?", "=", ""};
*/
 
 
 
 
} // drain::
 
 
#endif