| 1 | // Copyright (c) 2009 Carl Barron |
|---|---|
| 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 <iostream> |
| 7 | #include <sstream> |
| 8 | |
| 9 | #include <boost/detail/lightweight_test.hpp> |
| 10 | #include <boost/spirit/include/lex.hpp> |
| 11 | #include <boost/spirit/include/lex_lexertl.hpp> |
| 12 | #include <boost/spirit/include/phoenix.hpp> |
| 13 | |
| 14 | namespace lex = boost::spirit::lex; |
| 15 | namespace phoenix = boost::phoenix; |
| 16 | |
| 17 | /////////////////////////////////////////////////////////////////////////////// |
| 18 | template <typename Lexer> |
| 19 | struct multi_tokens : lex::lexer<Lexer> |
| 20 | { |
| 21 | int level; |
| 22 | |
| 23 | multi_tokens() : level(0) |
| 24 | { |
| 25 | using lex::_state; |
| 26 | using lex::_start; |
| 27 | using lex::_end; |
| 28 | using lex::_pass; |
| 29 | using lex::pass_flags; |
| 30 | |
| 31 | a = "A"; |
| 32 | b = "B"; |
| 33 | c = "C"; |
| 34 | this->self = |
| 35 | a [ ++phoenix::ref(t&: level) ] |
| 36 | | b |
| 37 | | c [ |
| 38 | _state = "in_dedenting", |
| 39 | _end = _start, |
| 40 | _pass = pass_flags::pass_ignore |
| 41 | ] |
| 42 | ; |
| 43 | |
| 44 | d = "."; |
| 45 | this->self("in_dedenting") = |
| 46 | d [ |
| 47 | if_(cond: --phoenix::ref(t&: level)) [ |
| 48 | _end = _start |
| 49 | ] |
| 50 | .else_ [ |
| 51 | _state = "INITIAL" |
| 52 | ] |
| 53 | ] |
| 54 | ; |
| 55 | } |
| 56 | |
| 57 | lex::token_def<> a, b, c, d; |
| 58 | }; |
| 59 | |
| 60 | struct dumper |
| 61 | { |
| 62 | typedef bool result_type; |
| 63 | |
| 64 | dumper(std::stringstream& strm) : strm(strm) {} |
| 65 | |
| 66 | template <typename Token> |
| 67 | bool operator () (Token const &t) |
| 68 | { |
| 69 | strm << (char)(t.id() - lex::min_token_id + 'a'); |
| 70 | return true; |
| 71 | } |
| 72 | |
| 73 | std::stringstream& strm; |
| 74 | |
| 75 | private: |
| 76 | // silence MSVC warning C4512: assignment operator could not be generated |
| 77 | dumper& operator= (dumper const&); |
| 78 | }; |
| 79 | |
| 80 | /////////////////////////////////////////////////////////////////////////////// |
| 81 | int main() |
| 82 | { |
| 83 | typedef lex::lexertl::token<std::string::iterator> token_type; |
| 84 | typedef lex::lexertl::actor_lexer<token_type> base_lexer_type; |
| 85 | typedef multi_tokens<base_lexer_type> lexer_type; |
| 86 | typedef lexer_type::iterator_type iterator; |
| 87 | |
| 88 | std::string in("AAABBC"); |
| 89 | std::string::iterator first(in.begin()); |
| 90 | std::stringstream strm; |
| 91 | |
| 92 | lexer_type the_lexer; |
| 93 | BOOST_TEST(lex::tokenize(first, in.end(), the_lexer, dumper(strm))); |
| 94 | BOOST_TEST(strm.str() == "aaabbddd"); |
| 95 | |
| 96 | return boost::report_errors(); |
| 97 | } |
| 98 | |
| 99 |