variable.cpp

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/*
Copyright (c) 2014, Sam Schetterer, Nathan Kutz, University of Washington
Authors: Sam Schetterer
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/
#include "variable.h"
#include "engineimp.h"
#include "item_heads.hpp"
#include "types/type_register.hpp"
void variable::print() const{
    std::cout << "variable " << this->name() << "=" << value;
}

void variable::_retrieve(retrieve_wrapper&& inval, item* caller){
    inval.check_and_get_type(typeid(double), &value);
    if(caller){
        double* d = (double*)inval.get_ptr();
        add_ref(*d, caller);
    }
}

void variable::add_ref(double& in, std::shared_ptr<item> inval){
    in=value;
    if(inval.use_count()){
        safe_mods[inval].insert(&in);
    }
    else{
#ifdef DEBUG
        err("Null pointer passed to variable add_ref", "variable::add_ref",
                "engine/variable.cpp", FATAL_ERROR);
#else
        err("Null pointer passed to variable add_ref", "variable::add_ref",
                "engine/variable.cpp", WARNING);
#endif
    }
}
void variable::add_ref(double& in, item* caller){
    if(caller){
        in = value;
        double* d = &in;
        //add pointer to the list of pointer for the given class
        if(holder->item_exists(caller->name())){
            safe_mods[std::weak_ptr<item>(holder->values[caller->name()].get_shared())].insert(d);
        }
        else{
            modifiers[caller].insert(d);
            err(std::string("Unsafe item ") + caller->name() + 
                    std::string(" being added to a variable modifier list"), 
                    "variable::retrieve", "engine/variable.cpp",
                    WARNING);
        }
    }
    else{
#ifdef DEBUG
        err("Null pointer passed to variable add_ref", "variable::add_ref",
                "engine/variable.cpp", FATAL_ERROR);
#else
        err("Null pointer passed to variable add_ref", "variable::add_ref",
                "engine/variable.cpp", WARNING);
#endif
    }
}
void variable::set(double p){
    value = p;
    //deal with periodicity here
    while(value > high_bound){
        value = low_bound + (value-high_bound);
    }
    while(value < low_bound){
        value = high_bound - (low_bound-value);
    }
    //add items to engine's list of items that require updating
    //Removes items from list if they no longer exist in the engine
    {
        std::map<item*, std::set<double*> >::iterator mit, mremove;

        for(mit = modifiers.begin(); mit!= modifiers.end();){
            if(mit->first && !holder->item_exists(mit->first->name())){
                mremove = mit;
                ++mit;
                modifiers.erase(mremove);
                continue;
            }
            for(auto& sit:mit->second){
                (*sit) = value;
            }
            if(mit->first){
                holder->needs_updating(mit->first->name());
            }
            ++mit;
        }
    }
    {
        std::map<std::weak_ptr<item>, std::set<double*> >::iterator mit, mremove;

        for(mit = safe_mods.begin(); mit!= safe_mods.end();){
            if(!mit->first.use_count()){
                mremove = mit;
                mit++;
                safe_mods.erase(mremove);
                continue;
            }
            for(auto& sit:mit->second){
                (*sit) = value;
            }
            holder->needs_updating(mit->first.lock()->name());
            mit++;
        }
    }
}
void variable::inc(double p){
    set(value + p);
}
void variable::inc(){
    inc(inc_size);
}

void variable::copy(double* inval){
    *inval = value;
}

void variable::parse(const std::string& inval){
    _double::parse(inval);
    inc_size=value;
    low_bound=0;
    high_bound=6.2382;
}

std::string variable::type()const{
    return "var";
}

template class type_register<variable>;