///
/// Evaluates the expression using values from the specified table.
/// \param args The table of variable values.
/// \return The output from the expression.
///
float_type evaluate(const args_type & args = args_type()) const
{
std::vector<float_type> stack;
for (const auto & t : _queue)
{
if (t.type == _token::number)
{
stack.push_back(t.get_value());
}
else if (t.type == _token::variable)
{
const auto item = args.find(t.text);
if (item == args.end())
throw jade::error()
<< "undefined variable '"
<< t.text
<< "'";
stack.push_back(item->second);
}
else
{
if (stack.size() < 2)
throw jade::error("invalid expression");
const auto n2 = stack.back();
stack.pop_back();
const auto n1 = stack.back();
stack.pop_back();
if (t.type == _token::plus ) stack.push_back(n1 + n2);
else if (t.type == _token::minus) stack.push_back(n1 - n2);
else if (t.type == _token::star ) stack.push_back(n1 * n2);
else if (t.type == _token::slash) stack.push_back(n1 / n2);
else throw jade::error("invalid operator");
}
}
if (stack.size() != 1)
throw jade::error("invalid expression");
return stack[0];
}
inline std::vector<char const *> get_args_ptrs(args_type const& args)
{
std::vector<char const*> args_ptrs{args.size()};
std::transform(std::begin(args), std::end(args), std::begin(args_ptrs), [](std::string const& s){ return s.c_str(); });
return args_ptrs;
}
std::vector<const char*> libclang_vim::get_args_ptrs(const args_type& args) {
std::vector<const char*> args_ptrs{args.size()};
std::transform(std::begin(args), std::end(args), std::begin(args_ptrs),
[](const std::string& s) { return s.c_str(); });
return args_ptrs;
}
