bloglang/13/env.cpp

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#include "env.hpp"
#include <cassert>
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int env_var::get_offset(const std::string& name) const {
if(name == this->name) return 0;
assert(parent);
return parent->get_offset(name) + 1;
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}
bool env_var::has_variable(const std::string& name) const {
if(name == this->name) return true;
if(parent) return parent->has_variable(name);
return false;
}
int env_offset::get_offset(const std::string& name) const {
assert(parent);
return parent->get_offset(name) + offset;
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}
bool env_offset::has_variable(const std::string& name) const {
if(parent) return parent->has_variable(name);
return false;
}