Ticket #10548: example.cpp

#include <boost/spirit/include/lex_lexertl.hpp>
#include <boost/bind.hpp>
#include <boost/ref.hpp>
#include <iostream>

namespace lex = boost::spirit::lex;

enum class token { word, eol, char_ };

template <class Lexer>
struct word_count_tokens: lex::lexer<Lexer> {
    word_count_tokens() {
        this->self.add
            ("[^ \t\n]+", token::word)
            ("\n"       , token::eol)
            ("."        , token::char_);
    }
};

struct counter {
    using result_type = bool;

    template <class Token>
    bool operator()(Token const &t, int &c, int w, int &l) {
        switch(t.id()) {
            case token::word:
                ++w;
                c += t.value().size();
                break;
            case token::eol:
                ++l;
                ++c;
                break;
            case token::char_:
                ++c;
                break;
        }
        return true;
    }
};

int main(int argc, char *argv[]) {
    int c{0}, w{0}, l{0};
    const std::string text{"test test\nline test"};
    const char * first = text.data(),
               * last  = text.data() + text.size();

    word_count_tokens<lex::lexertl::lexer<> > word_count_functor;
    bool r = lex::tokenize(first, last, word_count_functor,
        boost::bind(counter(), _1, boost::ref(c), boost::ref(w), boost::ref(l)));

    std::cout << "result: " << r << std::endl;
    std::cout << c << '\t' << w << '\t' << l << std::endl;

    return 0;
}