variables.cc

#include <stdexcept>
#include <cstddef>
#include <utility>

#include "variables.h"

using namespace std;

class RegularVariable
{
    void Set( std::string s )
    {
        value = s;
    }

    std::string Get( )
    {
        return value;
    }

    std::string value;
};

Scope::Scope()
{
    parent = NULL;
}

Scope::~Scope()
{
    map<string, Variable *>::iterator i;

    // Destroy all variables when exiting a scope
    for(i = variables.begin(); i != variables.end(); i ++ )
    {
        delete i->second;
    }
}

string Scope::lookup( string name )
{
    map<string, Variable *>::iterator i;

    i = variables.find( name );
    if( i == variables.end() ) {
        if( parent == NULL ) {
            throw runtime_error("Variable not defined");
        } else {
            return parent->lookup( name );
        }
    }

    return i->second->Get( );
}