1 /*=============================================================================
2 Copyright (c) 2001-2014 Joel de Guzman
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 =============================================================================*/
7 ///////////////////////////////////////////////////////////////////////////////
8 //
9 // Same as calc6, but this version also shows off grammar modularization.
10 // Here you will see how expressions is built as a modular grammars.
11 //
12 // [ JDG Sometime 2000 ] pre-boost
13 // [ JDG September 18, 2002 ] spirit1
14 // [ JDG April 8, 2007 ] spirit2
15 // [ JDG February 18, 2011 ] Pure attributes. No semantic actions.
16 // [ JDG April 9, 2014 ] Spirit X3 (from qi calc6)
17 // [ JDG May 2, 2014 ] Modular grammar using BOOST_SPIRIT_DEFINE.
18 //
19 ///////////////////////////////////////////////////////////////////////////////
20
21 #include "ast.hpp"
22 #include "vm.hpp"
23 #include "compiler.hpp"
24 #include "expression.hpp"
25 #include "error_handler.hpp"
26
27 ///////////////////////////////////////////////////////////////////////////////
28 // Main program
29 ///////////////////////////////////////////////////////////////////////////////
30 int
main()31 main()
32 {
33 std::cout << "/////////////////////////////////////////////////////////\n\n";
34 std::cout << "Expression parser...\n\n";
35 std::cout << "/////////////////////////////////////////////////////////\n\n";
36 std::cout << "Type an expression...or [q or Q] to quit\n\n";
37
38 typedef std::string::const_iterator iterator_type;
39 typedef client::ast::expression ast_expression;
40 typedef client::compiler compiler;
41
42 std::string str;
43 while (std::getline(std::cin, str))
44 {
45 if (str.empty() || str[0] == 'q' || str[0] == 'Q')
46 break;
47
48 using boost::spirit::x3::ascii::space;
49
50 client::vmachine mach; // Our virtual machine
51 std::vector<int> code; // Our VM code
52 auto calc = client::expression(); // grammar
53
54 ast_expression ast; // Our program (AST)
55 compiler compile(code); // Compiles the program
56
57 iterator_type iter = str.begin();
58 iterator_type const end = str.end();
59 bool r = phrase_parse(iter, end, calc, space, ast);
60
61 if (r && iter == end)
62 {
63 std::cout << "-------------------------\n";
64 std::cout << "Parsing succeeded\n";
65 compile(ast);
66 mach.execute(code);
67 std::cout << "\nResult: " << mach.top() << std::endl;
68 std::cout << "-------------------------\n";
69 }
70 else
71 {
72 std::string rest(iter, end);
73 std::cout << "-------------------------\n";
74 std::cout << "Parsing failed\n";
75 std::cout << "-------------------------\n";
76 }
77 }
78
79 std::cout << "Bye... :-) \n\n";
80 return 0;
81 }
82