Form Parser::parse() const
{
Form ast;
auto it = tokens.cbegin();
while (it != tokens.cend()) {
if (*it != "(") {
std::ostringstream ss;
ss << "Error: token " << *it << "is not in an expression";
throw ParsingError(ss.str());
}
ast.push_back(parse_expr(++it, tokens.cend()));
}
return ast;
}
