| /*============================================================================= |
| Copyright (c) 2001-2010 Joel de Guzman |
| |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| =============================================================================*/ |
| #include <boost/config/warning_disable.hpp> |
| #include <input/parse_sexpr_impl.hpp> |
| #include <scheme/compiler.hpp> |
| #include <utree/io.hpp> |
| #include <iostream> |
| #include <fstream> |
| |
| bool ignore_bom(std::ifstream& in, char const* filename) |
| { |
| // Ignore the BOM marking the beginning of a UTF-8 file in Windows |
| char c = in.peek(); |
| if (c == '\xef') |
| { |
| char s[3]; |
| in >> s[0] >> s[1] >> s[2]; |
| s[3] = '\0'; |
| if (s != std::string("\xef\xbb\xbf")) |
| { |
| std::cerr << "Error: Unexpected characters from input file: " |
| << filename << std::endl; |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Main program |
| /////////////////////////////////////////////////////////////////////////////// |
| int main() |
| { |
| char const* filename = "factorial.scm"; |
| std::ifstream in(filename, std::ios_base::in); |
| |
| if (!in) |
| { |
| std::cerr << "Error: Could not open input file: " |
| << filename << std::endl; |
| return -1; |
| } |
| if (!ignore_bom(in, filename)) |
| return -1; |
| |
| using scheme::interpreter; |
| using scheme::function; |
| |
| interpreter program(in); |
| function factorial = program["factorial"]; |
| std::cout << factorial(10) << std::endl; |
| |
| return 0; |
| } |
| |
| |