| 1 | // Copyright (c) 2001-2011 Hartmut Kaiser |
|---|---|
| 2 | // |
| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 5 | |
| 6 | #include <boost/spirit/include/lex_lexertl.hpp> |
| 7 | |
| 8 | #include <boost/phoenix/object.hpp> |
| 9 | #include <boost/phoenix/operator.hpp> |
| 10 | |
| 11 | #include <boost/core/lightweight_test.hpp> |
| 12 | |
| 13 | /////////////////////////////////////////////////////////////////////////////// |
| 14 | // Token definition |
| 15 | /////////////////////////////////////////////////////////////////////////////// |
| 16 | template <typename Lexer> |
| 17 | struct switch_state_tokens : boost::spirit::lex::lexer<Lexer> |
| 18 | { |
| 19 | // define tokens and associate them with the lexer |
| 20 | switch_state_tokens() |
| 21 | { |
| 22 | namespace phoenix = boost::phoenix; |
| 23 | using boost::spirit::lex::_state; |
| 24 | |
| 25 | identifier = "[a-zA-Z_][a-zA-Z0-9_]*"; |
| 26 | this->self = identifier [ phoenix::ref(t&: state_) = _state ]; |
| 27 | |
| 28 | integer = "[0-9]+"; |
| 29 | this->self("INT") = integer [ _state = "INITIAL"]; |
| 30 | } |
| 31 | |
| 32 | std::string state_; |
| 33 | boost::spirit::lex::token_def<> identifier, integer; |
| 34 | }; |
| 35 | |
| 36 | /////////////////////////////////////////////////////////////////////////////// |
| 37 | int main() |
| 38 | { |
| 39 | using namespace boost::spirit; |
| 40 | using namespace boost::spirit::lex; |
| 41 | |
| 42 | typedef std::string::iterator base_iterator_type; |
| 43 | typedef boost::spirit::lex::lexertl::token<base_iterator_type> token_type; |
| 44 | typedef boost::spirit::lex::lexertl::actor_lexer<token_type> lexer_type; |
| 45 | |
| 46 | { |
| 47 | switch_state_tokens<lexer_type> lex; |
| 48 | |
| 49 | { |
| 50 | // verify whether using _state as an rvalue works |
| 51 | std::string input("abc123"); |
| 52 | base_iterator_type first = input.begin(); |
| 53 | BOOST_TEST(boost::spirit::lex::tokenize(first, input.end(), lex) && |
| 54 | lex.state_ == "INITIAL"); |
| 55 | } |
| 56 | { |
| 57 | // verify whether using _state as an lvalue works |
| 58 | std::string input("123abc123"); |
| 59 | base_iterator_type first = input.begin(); |
| 60 | BOOST_TEST(boost::spirit::lex::tokenize(first, input.end(), lex, "INT") && |
| 61 | lex.state_ == "INITIAL"); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | return boost::report_errors(); |
| 66 | } |
| 67 | |
| 68 |