1 /*=============================================================================
2 Copyright (c) 2001-2011 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 // Now we'll introduce variables and assignment. This time, we'll also
10 // be renaming some of the rules -- a strategy for a grander scheme
11 // to come ;-)
12 //
13 // This version also shows off grammar modularization. Here you will
14 // see how expressions and statements are built as modular grammars.
15 //
16 // [ JDG April 9, 2007 ] spirit2
17 // [ JDG February 18, 2011 ] Pure attributes. No semantic actions.
18 //
19 ///////////////////////////////////////////////////////////////////////////////
20
21 #include "statement.hpp"
22 #include "vm.hpp"
23 #include "compiler.hpp"
24
25 ///////////////////////////////////////////////////////////////////////////////
26 // Main program
27 ///////////////////////////////////////////////////////////////////////////////
28 int
main()29 main()
30 {
31 std::cout << "/////////////////////////////////////////////////////////\n\n";
32 std::cout << "Statement parser...\n\n";
33 std::cout << "/////////////////////////////////////////////////////////\n\n";
34 std::cout << "Type some statements... ";
35 std::cout << "An empty line ends input, compiles, runs and prints results\n\n";
36 std::cout << "Example:\n\n";
37 std::cout << " var a = 123;\n";
38 std::cout << " var b = 456;\n";
39 std::cout << " var c = a + b * 2;\n\n";
40 std::cout << "-------------------------\n";
41
42 std::string str;
43 std::string source;
44 while (std::getline(std::cin, str))
45 {
46 if (str.empty())
47 break;
48 source += str + '\n';
49 }
50
51 typedef std::string::const_iterator iterator_type;
52 iterator_type iter = source.begin();
53 iterator_type end = source.end();
54
55 client::vmachine vm; // Our virtual machine
56 client::code_gen::program program; // Our VM program
57 client::ast::statement_list ast; // Our AST
58
59 client::error_handler<iterator_type>
60 error_handler(iter, end); // Our error handler
61 client::parser::statement<iterator_type>
62 parser(error_handler); // Our parser
63 client::code_gen::compiler
64 compile(program, error_handler); // Our compiler
65
66 boost::spirit::ascii::space_type space;
67 bool success = phrase_parse(iter, end, parser, space, ast);
68
69 std::cout << "-------------------------\n";
70
71 if (success && iter == end)
72 {
73 if (compile(ast))
74 {
75 std::cout << "Success\n";
76 std::cout << "-------------------------\n";
77 vm.execute(program());
78
79 std::cout << "-------------------------\n";
80 std::cout << "Assembler----------------\n\n";
81 program.print_assembler();
82
83 std::cout << "-------------------------\n";
84 std::cout << "Results------------------\n\n";
85 program.print_variables(vm.get_stack());
86 }
87 else
88 {
89 std::cout << "Compile failure\n";
90 }
91 }
92 else
93 {
94 std::cout << "Parse failure\n";
95 }
96
97 std::cout << "-------------------------\n\n";
98 return 0;
99 }
100
101
102