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///////////////////////////////////////////////////////////////////////////////
28int
29main()
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(is&: std::cin, str&: 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(first&: iter, last: end, expr: parser, skipper: space, attr&: 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(code: 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(stack: 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

source code of boost/libs/spirit/example/qi/compiler_tutorial/calc7/main.cpp