1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2001-2011 Hartmut Kaiser
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7=============================================================================*/
8///////////////////////////////////////////////////////////////////////////////
9//
10// Not a calculator anymore, right? :-)
11//
12// [ JDG April 10, 2007 ] spirit2
13// [ JDG February 18, 2011 ] Pure attributes. No semantic actions.
14// [ HK June 3, 2011 ] Adding lexer
15//
16///////////////////////////////////////////////////////////////////////////////
17
18#include "config.hpp"
19#include "function.hpp"
20#include "vm.hpp"
21#include "compiler.hpp"
22#include "lexer.hpp"
23#include <boost/lexical_cast.hpp>
24#include <fstream>
25
26///////////////////////////////////////////////////////////////////////////////
27// Main program
28///////////////////////////////////////////////////////////////////////////////
29int main(int argc, char **argv)
30{
31 char const* filename;
32 if (argc > 1)
33 {
34 filename = argv[1];
35 }
36 else
37 {
38 std::cerr << "Error: No input file provided." << std::endl;
39 return 1;
40 }
41
42 std::ifstream in(filename, std::ios_base::in);
43
44 if (!in)
45 {
46 std::cerr << "Error: Could not open input file: "
47 << filename << std::endl;
48 return 1;
49 }
50
51 std::string source_code; // We will read the contents here.
52 in.unsetf(mask: std::ios::skipws); // No white space skipping!
53 std::copy(
54 first: std::istream_iterator<char>(in),
55 last: std::istream_iterator<char>(),
56 result: std::back_inserter(x&: source_code));
57
58 typedef std::string::const_iterator base_iterator_type;
59 typedef client::lexer::conjure_tokens<base_iterator_type> lexer_type;
60 typedef lexer_type::iterator_type iterator_type;
61
62 lexer_type lexer; // Our lexer
63
64 base_iterator_type first = source_code.begin();
65 base_iterator_type last = source_code.end();
66
67 iterator_type iter = lexer.begin(first, last);
68 iterator_type end = lexer.end();
69
70 client::vmachine vm; // Our virtual machine
71 client::ast::function_list ast; // Our AST
72
73 client::error_handler<base_iterator_type, iterator_type>
74 error_handler(first, last); // Our error handler
75 client::parser::function<iterator_type, lexer_type>
76 function(error_handler, lexer); // Our parser
77 client::code_gen::compiler
78 compiler(error_handler); // Our compiler
79
80 // note: we don't need a skipper
81 bool success = parse(first&: iter, last: end, expr: +function, attr&: ast);
82
83 std::cout << "-------------------------\n";
84
85 if (success && iter == end)
86 {
87 if (compiler(ast))
88 {
89 boost::shared_ptr<client::code_gen::function>
90 p = compiler.find_function(name: "main");
91 if (!p)
92 return 1;
93
94 int nargs = argc-2;
95 if (p->nargs() != nargs)
96 {
97 std::cerr << "Error: main function requires " << p->nargs() << " arguments." << std::endl;
98 std::cerr << nargs << " supplied." << std::endl;
99 return 1;
100 }
101
102 std::cout << "Success\n";
103 std::cout << "-------------------------\n";
104 std::cout << "Assembler----------------\n\n";
105 compiler.print_assembler();
106
107 // Push the arguments into our stack
108 for (int i = 0; i < nargs; ++i)
109 vm.get_stack()[i] = boost::lexical_cast<int>(arg: argv[i+2]);
110
111 // Call the interpreter
112 int r = vm.execute(code: compiler.get_code());
113
114 std::cout << "-------------------------\n";
115 std::cout << "Result: " << r << std::endl;
116 std::cout << "-------------------------\n\n";
117 }
118 else
119 {
120 std::cout << "Compile failure\n";
121 }
122 }
123 else
124 {
125 error_handler.dump_error_line(err_pos_base: first);
126 std::cout << "Parse failure\n";
127 }
128 return 0;
129}
130
131
132

source code of boost/libs/spirit/example/qi/compiler_tutorial/conjure2/main.cpp