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// Now we'll introduce boolean expressions and control structures.
10// Is it obvious now what we are up to? ;-)
11//
12// [ JDG April 9, 2007 ] spirit2
13// [ JDG February 18, 2011 ] Pure attributes. No semantic actions.
14// [ JDG June 6, 2014 ] Ported from qi calc8 example.
15//
16///////////////////////////////////////////////////////////////////////////////
17
18#include "ast.hpp"
19#include "vm.hpp"
20#include "compiler.hpp"
21#include "statement.hpp"
22#include "error_handler.hpp"
23#include "config.hpp"
24#include <iostream>
25
26///////////////////////////////////////////////////////////////////////////////
27// Main program
28///////////////////////////////////////////////////////////////////////////////
29int
30main()
31{
32 std::cout << "/////////////////////////////////////////////////////////\n\n";
33 std::cout << "Statement parser...\n\n";
34 std::cout << "/////////////////////////////////////////////////////////\n\n";
35 std::cout << "Type some statements... ";
36 std::cout << "An empty line ends input, compiles, runs and prints results\n\n";
37 std::cout << "Example:\n\n";
38 std::cout << " var a = 123;\n";
39 std::cout << " var b = 456;\n";
40 std::cout << " var c = a + b * 2;\n\n";
41 std::cout << "-------------------------\n";
42
43 std::string str;
44 std::string source;
45 while (std::getline(is&: std::cin, str&: str))
46 {
47 if (str.empty())
48 break;
49 source += str + '\n';
50 }
51
52 using client::parser::iterator_type;
53 iterator_type iter(source.begin());
54 iterator_type end(source.end());
55
56
57 client::vmachine vm; // Our virtual machine
58 client::code_gen::program program; // Our VM program
59 client::ast::statement_list ast; // Our AST
60
61 using boost::spirit::x3::with;
62 using client::parser::error_handler_type;
63 error_handler_type error_handler(iter, end, std::cerr); // Our error handler
64
65 // Our compiler
66 client::code_gen::compiler compile(program, error_handler);
67
68 // Our parser
69 auto const parser =
70 // we pass our error handler to the parser so we can access
71 // it later on in our on_error and on_sucess handlers
72 with<client::parser::error_handler_tag>(val: std::ref(t&: error_handler))
73 [
74 client::statement()
75 ];
76
77 using boost::spirit::x3::ascii::space;
78 bool success = phrase_parse(first&: iter, last: end, p: parser, s: space, attr&: ast);
79
80 std::cout << "-------------------------\n";
81
82 if (success && iter == end)
83 {
84 if (compile.start(x: ast))
85 {
86 std::cout << "Success\n";
87 std::cout << "-------------------------\n";
88 vm.execute(code: program());
89
90 std::cout << "-------------------------\n";
91 std::cout << "Assembler----------------\n\n";
92 program.print_assembler();
93
94 std::cout << "-------------------------\n";
95 std::cout << "Results------------------\n\n";
96 program.print_variables(stack: vm.get_stack());
97 }
98 else
99 {
100 std::cout << "Compile failure\n";
101 }
102 }
103 else
104 {
105 std::cout << "Parse failure\n";
106 }
107
108 std::cout << "-------------------------\n\n";
109 return 0;
110}
111

source code of boost/libs/spirit/example/x3/calc/calc9/main.cpp