1// Copyright (c) 2001-2010 Hartmut Kaiser
2// Copyright (c) 2010 Mathias Gaunard
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// This test makes sure that the BOL state (begin of line) is properly reset
8// if a token matched at the beginning of a line is discarded using
9// lex::pass_fail.
10// Additionally this test makes sure the syntax 'self("state", "targetstate")'
11// works properly.
12
13#include <boost/spirit/include/lex_lexertl.hpp>
14
15#include <boost/core/lightweight_test.hpp>
16#include <boost/phoenix/operator/self.hpp>
17
18#include <sstream>
19
20namespace spirit = boost::spirit;
21namespace lex = spirit::lex;
22
23typedef char const* content_iterator;
24typedef lex::lexertl::token<content_iterator> token_type;
25
26struct lexer
27 : lex::lexer<lex::lexertl::actor_lexer<token_type> >
28{
29 lexer() : word("^[a-zA-Z0-9]+$", 1)
30 {
31 self("INITIAL", "O") =
32 word
33 | lex::string("!.*$") [
34 lex::_pass = lex::pass_flags::pass_ignore
35 ]
36 | lex::token_def<>('\n', 2)
37 ;
38
39 self("O", "INITIAL") =
40 lex::string(".") [
41 lex::_pass = lex::pass_flags::pass_fail
42 ]
43 ;
44 }
45
46 lex::token_def<> word;
47};
48
49typedef lexer::iterator_type token_iterator;
50
51int main()
52{
53 std::string const s = "!foo\nbar\n!baz";
54
55 content_iterator begin = s.data();
56 content_iterator end = s.data() + s.size();
57
58 lexer l;
59 token_iterator begin2 = l.begin(first&: begin, last: end);
60 token_iterator end2 = l.end();
61
62 std::size_t test_data[] = { 2, 1, 2 };
63 std::size_t const test_data_size = sizeof(test_data)/sizeof(test_data[0]);
64
65 token_iterator it = begin2;
66 std::size_t i = 0;
67 for (/**/; it != end2 && i < test_data_size; ++it, ++i)
68 {
69 BOOST_TEST(it->id() == test_data[i]);
70 }
71 BOOST_TEST(it == end2);
72 BOOST_TEST(i == test_data_size);
73
74 return boost::report_errors();
75}
76

source code of boost/libs/spirit/test/lex/auto_switch_lexerstate.cpp