ceph/src/boost/libs/spirit/test/lex/regression_file_iterator4.cpp

   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
  11 #include <boost/spirit/include/support_multi_pass.hpp>
  12 #include <boost/spirit/include/classic_position_iterator.hpp>
  13 #include <boost/spirit/include/lex_lexertl.hpp>
  14
  15 #include <boost/core/lightweight_test.hpp>
  16 #include <boost/phoenix/operator/self.hpp>
  17 #include <boost/phoenix/statement/sequence.hpp>
  18
  19 namespace spirit = boost::spirit;
  20 namespace lex = spirit::lex;
  21
  22 typedef spirit::classic::position_iterator2<
  23     spirit::multi_pass<std::istreambuf_iterator<char> >
  24 > file_iterator;
  25
  26 inline file_iterator
  27 make_file_iterator(std::istream& input, const std::string& filename)
  28 {
  29     return file_iterator(
  30         spirit::make_default_multi_pass(
  31             std::istreambuf_iterator<char>(input)),
  32         spirit::multi_pass<std::istreambuf_iterator<char> >(),
  33         filename);
  34 }
  35
  36 typedef lex::lexertl::token<file_iterator> token_type;
  37
  38 struct lexer
  39   : lex::lexer<lex::lexertl::actor_lexer<token_type> >
  40 {
  41     lexer() : word("^[a-zA-Z0-9]+$", 1)
  42     {
  43         self =  word [
  44                     lex::_state = "O"
  45                 ]
  46             |   lex::token_def<>("!.*$") [(
  47                     lex::_state = "O"
  48                   , lex::_pass = lex::pass_flags::pass_ignore
  49                 )]
  50             |   lex::token_def<>('\n', 2) [
  51                     lex::_state = "O"
  52                 ]
  53             ;
  54
  55         self("O") =
  56                 lex::token_def<>(".") [(
  57                     lex::_state = "INITIAL"
  58                   , lex::_pass = lex::pass_flags::pass_fail
  59                 )]
  60             ;
  61     }
  62
  63     lex::token_def<> word;
  64 };
  65
  66 typedef lexer::iterator_type token_iterator;
  67
  68 int main()
  69 {
  70     std::stringstream ss;
  71     ss << "!foo\nbar\n!baz";
  72
  73     file_iterator begin = make_file_iterator(ss, "SS");
  74     file_iterator end;
  75
  76     lexer l;
  77     token_iterator begin2 = l.begin(begin, end);
  78     token_iterator end2 = l.end();
  79
  80     std::size_t test_data[] = { 2, 1, 2 };
  81     std::size_t const test_data_size = sizeof(test_data)/sizeof(test_data[0]);
  82
  83     token_iterator it = begin2;
  84     std::size_t i = 0;
  85     for (/**/; it != end2 && i < test_data_size; ++it, ++i)
  86     {
  87         BOOST_TEST(it->id() == test_data[i]);
  88     }
  89     BOOST_TEST(it == end2);
  90     BOOST_TEST(i == test_data_size);
  91
  92     return boost::report_errors();
  93 }