var.cpp


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/**
 * forspll - LLVM-based Forsp compiler
 * Copyright (C) 2024  Clyne Sullivan <clyne@bitgloo.com>
 *
 * 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 "var.hpp"

std::list<std::map<std::string, Var>> Var::vars;

Var Var::lookup(const std::string& name, int skip)
{
    for (auto sc = vars.rbegin(); sc != vars.rend(); ++sc) {
        if (skip > 0) {
            --skip;
            continue;
        }
        if (sc->contains(name))
            return (*sc)[name];
    }

    return {};
}

void Var::rename(const std::string& old, const std::string& neww, int skip)
{
    for (auto sc = vars.rbegin(); sc != vars.rend(); ++sc) {
        if (skip > 0) {
            --skip;
            continue;
        }
        if (sc->contains(old)) {
            auto it = sc->find(old);
            (*sc)[neww] = it->second;
            //it->second.value->setName(neww);
            sc->erase(it);
            break;
        }
    }
}

Var Var::lookupLocal(const std::string& name)
{
    return vars.back().contains(name) ? vars.back()[name] : Var();
}

void Var::pushScope()
{
    vars.emplace_back();
}

void Var::popScope()
{
    vars.pop_back();
}

Var& Var::addGlobal(const std::string& name, Var var)
{
    return vars.front().emplace(name, var).first->second;
}

Var& Var::addLocal(const std::string& name, Var var)
{
    return vars.back().emplace(name, var).first->second;
}