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#if !defined(BOOST_SPIRIT_MINIC_ERROR_HANDLER_HPP)
8#define BOOST_SPIRIT_MINIC_ERROR_HANDLER_HPP
9
10#include <iostream>
11#include <string>
12#include <vector>
13
14namespace client
15{
16 ///////////////////////////////////////////////////////////////////////////////
17 // The error handler
18 ///////////////////////////////////////////////////////////////////////////////
19 template <typename Iterator>
20 struct error_handler
21 {
22 template <typename, typename, typename>
23 struct result { typedef void type; };
24
25 error_handler(Iterator first, Iterator last)
26 : first(first), last(last) {}
27
28 template <typename Message, typename What>
29 void operator()(
30 Message const& message,
31 What const& what,
32 Iterator err_pos) const
33 {
34 int line;
35 Iterator line_start = get_pos(err_pos, line);
36 if (err_pos != last)
37 {
38 std::cout << message << what << " line " << line << ':' << std::endl;
39 std::cout << get_line(err_pos: line_start) << std::endl;
40 for (; line_start != err_pos; ++line_start)
41 std::cout << ' ';
42 std::cout << '^' << std::endl;
43 }
44 else
45 {
46 std::cout << "Unexpected end of file. ";
47 std::cout << message << what << " line " << line << std::endl;
48 }
49 }
50
51 Iterator get_pos(Iterator err_pos, int& line) const
52 {
53 line = 1;
54 Iterator i = first;
55 Iterator line_start = first;
56 while (i != err_pos)
57 {
58 bool eol = false;
59 if (i != err_pos && *i == '\r') // CR
60 {
61 eol = true;
62 line_start = ++i;
63 }
64 if (i != err_pos && *i == '\n') // LF
65 {
66 eol = true;
67 line_start = ++i;
68 }
69 if (eol)
70 ++line;
71 else
72 ++i;
73 }
74 return line_start;
75 }
76
77 std::string get_line(Iterator err_pos) const
78 {
79 Iterator i = err_pos;
80 // position i to the next EOL
81 while (i != last && (*i != '\r' && *i != '\n'))
82 ++i;
83 return std::string(err_pos, i);
84 }
85
86 Iterator first;
87 Iterator last;
88 std::vector<Iterator> iters;
89 };
90}
91
92#endif
93
94

source code of boost/libs/spirit/example/qi/compiler_tutorial/mini_c/error_handler.hpp