How can I just use unrecognized characters?

I managed to parse the pgn file thanks to the Boost Spirit library, but it fails as soon as there are some characters that I did not "expect".

Here is my grammar of the Spirit:

#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

BOOST_FUSION_ADAPT_STRUCT(
    loloof64::pgn_tag,
    (std::string, key),
    (std::string, value)
)

BOOST_FUSION_ADAPT_STRUCT(
    loloof64::game_move,
    (unsigned, move_number),
    (std::string, move_turn),
    (std::string, white_move),
    (std::string, black_move),
    (std::string, result)
)

BOOST_FUSION_ADAPT_STRUCT(
    loloof64::pgn_game,
    (std::vector<loloof64::pgn_tag>, header),
    (std::vector<loloof64::game_move>, moves)
)

namespace loloof64 {
    namespace qi = boost::spirit::qi;
    namespace ascii = boost::spirit::ascii;
    namespace phoenix = boost::phoenix;

    template <typename Iterator>
    struct pgn_parser : qi::grammar<Iterator, std::vector<pgn_game>, qi::unused_type>
    {
        pgn_parser() : pgn_parser::base_type(games)
        {
            using qi::lexeme;
            using ascii::char_;
            using qi::uint_;
            using qi::alnum;
            using qi::space;
            using qi::omit;
            using qi::eol;
            using qi::lit;

            quoted_string %= lexeme[lit('"') >> *(char_ - '"') >> lit('"')];

            tag %=
                '['
                >> +alnum
                >> omit[+space]
                >> quoted_string
                >> ']'
                >> omit[+eol]
                ;

            header %= +tag;

            move_turn %= qi::string("...") | qi::string(".");

            regular_move %=
                +char_("a-hNBRQK")
                >> +char_("a-h1-8x=NBRQK")
                >> -qi::string("e.p.")
                ;
            castle_move %= qi::string("O-O-O") | qi::string("O-O");
            single_move %=
                (regular_move | castle_move) >> -(char_('+') | char_('#'))
                ;

            result %= qi::string("1-0") | qi::string("0-1") | qi::string("1/2-1/2") | qi::string("*");

            full_move %=
                uint_
                >> move_turn
                >> omit[*space]
                >> single_move
                >> -(omit[+space] >> single_move)
                >> -(omit[+space] >> result)
                ;

            game_description %= full_move
                >> *(omit[*space] >> full_move);

            single_game %=
                -header
                >> game_description
                ;

            games %=
                single_game
                >> *(omit[*(space|eol)] >> single_game)
                ;
        }

        qi::rule<Iterator, pgn_tag(), qi::unused_type> tag;
        qi::rule<Iterator, std::vector<pgn_tag>, qi::unused_type> header;
        qi::rule<Iterator, std::string(), qi::unused_type> quoted_string;

        qi::rule<Iterator, std::string(), qi::unused_type> result;
        qi::rule<Iterator, std::string(), qi::unused_type> regular_move;
        qi::rule<Iterator, std::string(), qi::unused_type> castle_move;
        qi::rule<Iterator, std::string(), qi::unused_type> single_move;
        qi::rule<Iterator, std::string(), qi::unused_type> move_turn;
        qi::rule<Iterator, game_move(), qi::unused_type> full_move;
        qi::rule<Iterator, std::vector<game_move>, qi::unused_type> game_description;

        qi::rule<Iterator, pgn_game, qi::unused_type> single_game;
        qi::rule<Iterator, std::vector<pgn_game>, qi::unused_type> games;
    };
}

How can I just use any character that I couldn’t β€œforesee”? I mean, how could I ignore any character that I don't want in any of the rules of my grammar?

Regarding test goals:

here is my parser header (pgn_games_extractor.hpp)

#ifndef PGNGAMESEXTRACTOR_HPP
#define PGNGAMESEXTRACTOR_HPP

#include <string>
#include <vector>
#include <fstream>
#include <stdexcept>

namespace loloof64 {

    struct pgn_tag {
        std::string key;
        std::string value;
    };

    struct game_move {
        unsigned move_number;
        std::string move_turn;
        std::string white_move;
        std::string black_move;
        std::string result;
    };

    struct pgn_game {
        std::vector<pgn_tag> header;
        std::vector<game_move> moves;
    };

    class PgnGamesExtractor
    {
        public:
            PgnGamesExtractor(std::string inputFilePath);
            PgnGamesExtractor(std::ifstream &inputFile);
            /*
            Both constructos may throw PgnParsingException (if bad pgn format) and InputFileException (if missing file)
            */
            std::vector<pgn_game> getGames() const { return games; }
            virtual ~PgnGamesExtractor();

        protected:

        private:
            std::vector<pgn_game> games;
            void parseInput(std::ifstream &inputFile);
    };

    class PgnParsingException : public std::runtime_error
    {
    public:
        PgnParsingException(std::string message):     std::runtime_error(message){}
    };

    class InputFileException : public std::runtime_error
    {
    public:
        InputFileException(std::string message) :     std::runtime_error(message){}
    };
}

#endif // PGNGAMESEXTRACTOR_HPP

Here is my parser source (pgn_games_extractor.cpp):

#include "pgn_games_extractor.hpp"

#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

BOOST_FUSION_ADAPT_STRUCT(
    loloof64::pgn_tag,
    (std::string, key),
    (std::string, value)
)

BOOST_FUSION_ADAPT_STRUCT(
    loloof64::game_move,
    (unsigned, move_number),
    (std::string, move_turn),
    (std::string, white_move),
    (std::string, black_move),
    (std::string, result)
)

BOOST_FUSION_ADAPT_STRUCT(
    loloof64::pgn_game,
    (std::vector<loloof64::pgn_tag>, header),
    (std::vector<loloof64::game_move>, moves)
)

namespace loloof64 {
    namespace qi = boost::spirit::qi;
    namespace ascii = boost::spirit::ascii;
    namespace phoenix = boost::phoenix;

    template <typename Iterator>
    struct pgn_parser : qi::grammar<Iterator, std::vector<pgn_game>, qi::unused_type>
    {
        pgn_parser() : pgn_parser::base_type(games)
        {
            using qi::lexeme;
            using ascii::char_;
            using qi::uint_;
            using qi::alnum;
            using qi::space;
            using qi::omit;
            using qi::eol;
            using qi::lit;

            quoted_string %= lexeme[lit('"') >> *(char_ - '"') >> lit('"')];

            tag %=
                '['
                >> +alnum
                >> omit[+space]
                >> quoted_string
                >> ']'
                >> omit[+eol]
                ;

            header %= +tag;

            move_turn %= qi::string("...") | qi::string(".");

            regular_move %=
                +char_("a-hNBRQK")
                >> +char_("a-h1-8x=NBRQK")
                >> -qi::string("e.p.")
                ;
            castle_move %= qi::string("O-O-O") | qi::string("O-O");
            single_move %=
                (regular_move | castle_move) >> -(char_('+') | char_('#'))
                ;

            result %= qi::string("1-0") | qi::string("0-1") | qi::string("1/2-1/2") | qi::string("*");

            full_move %=
                uint_
                >> move_turn
                >> omit[*space]
                >> single_move
                >> -(omit[+space] >> single_move)
                >> -(omit[+space] >> result)
                ;

            game_description %= full_move
                >> *(omit[*space] >> full_move);

            single_game %=
                -header
                >> game_description
                ;

            games %=
                single_game
                >> *(omit[*(space|eol)] >> single_game)
                ;
        }

        qi::rule<Iterator, pgn_tag(), qi::unused_type> tag;
        qi::rule<Iterator, std::vector<pgn_tag>, qi::unused_type> header;
        qi::rule<Iterator, std::string(), qi::unused_type> quoted_string;

        qi::rule<Iterator, std::string(), qi::unused_type> result;
        qi::rule<Iterator, std::string(), qi::unused_type> regular_move;
        qi::rule<Iterator, std::string(), qi::unused_type> castle_move;
        qi::rule<Iterator, std::string(), qi::unused_type> single_move;
        qi::rule<Iterator, std::string(), qi::unused_type> move_turn;
        qi::rule<Iterator, game_move(), qi::unused_type> full_move;
        qi::rule<Iterator, std::vector<game_move>, qi::unused_type> game_description;

        qi::rule<Iterator, pgn_game, qi::unused_type> single_game;
        qi::rule<Iterator, std::vector<pgn_game>, qi::unused_type> games;
    };
}


loloof64::PgnGamesExtractor::PgnGamesExtractor(std::string inputFilePath)
{
    std::ifstream inputFile(inputFilePath);
    parseInput(inputFile);
}

loloof64::PgnGamesExtractor::PgnGamesExtractor(std::ifstream &inputFile)
{
    parseInput(inputFile);
}

loloof64::PgnGamesExtractor::~PgnGamesExtractor()
{
    //dtor
}

void loloof64::PgnGamesExtractor::parseInput(std::ifstream &inputFile)
{
    using namespace std;

    if (! inputFile) throw InputFileException("File does not exist !");

    string content("");
    getline(inputFile, content, (char) inputFile.eof());

    if (inputFile.fail() || inputFile.bad()) throw new     InputFileException("Could not read the input file !");

    loloof64::pgn_parser<string::const_iterator> parser;
    std::vector<loloof64::pgn_game> temp_games;

    string::const_iterator iter = content.begin();
    string::const_iterator end = content.end();

    bool success = boost::spirit::qi::phrase_parse(iter, end, parser, boost::spirit::qi::eol, temp_games);

    if (success && iter == end)
    {
        games = temp_games;
    }
    else
    {
        string error_fragment(iter, end);
        string error_message("");

        error_message = "Failed to parse the input at :'" + error_fragment + "' !";

        throw PgnParsingException(error_message);
    }
}

I ask this question because I could not parse the following pgn: ScotchGambitPgn.zip . I think this is due to an encoding problem with this file.

I am using Spirit 2 and C ++ 11 (Gnu)

+4
3

, :

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//#define BOOST_SPIRIT_DEBUG
#ifndef PGNGAMESEXTRACTOR_HPP
#define PGNGAMESEXTRACTOR_HPP

#include <string>
#include <vector>
#include <fstream>
#include <stdexcept>

namespace loloof64 {

struct pgn_tag {
    std::string key;
    std::string value;
};

struct game_move {
    unsigned move_number;
    std::string white_move;
    std::string black_move;
    enum result_t { white_won, black_won, draw, undecided } result;
};

struct pgn_game {
    std::vector<pgn_tag> header;
    std::vector<game_move> moves;
};

class PgnGamesExtractor {
  public:
    PgnGamesExtractor(std::string inputFilePath);
    PgnGamesExtractor(std::istream &inputFile);
    /*
    Both constructos may throw PgnParsingException (if bad pgn format) and InputFileException (if missing file)
    */
    std::vector<pgn_game> getGames() const { return games; }
    virtual ~PgnGamesExtractor();

  protected:
  private:
    std::vector<pgn_game> games;
    void parseInput(std::istream &inputFile);
};

class PgnParsingException : public virtual std::runtime_error {
  public:
    PgnParsingException(std::string message) : std::runtime_error(message) {}
};

class InputFileException : public virtual std::runtime_error {
  public:
    InputFileException(std::string message) : std::runtime_error(message) {}
};
}

#endif // PGNGAMESEXTRACTOR_HPP

#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

BOOST_FUSION_ADAPT_STRUCT(loloof64::pgn_tag, key, value)
BOOST_FUSION_ADAPT_STRUCT(loloof64::game_move, move_number, white_move, black_move, result)
BOOST_FUSION_ADAPT_STRUCT(loloof64::pgn_game, header, moves)

namespace loloof64 {
namespace qi = boost::spirit::qi;

template <typename Iterator> struct pgn_parser : qi::grammar<Iterator, std::vector<pgn_game>, qi::space_type> {
    pgn_parser() : pgn_parser::base_type(games) {
        using namespace qi;

        const std::string no_move;
        result.add
            ("1-0",     game_move::white_won)
            ("0-1",     game_move::black_won)
            ("1/2-1/2", game_move::draw)
            ("*",       game_move::undecided);

        quoted_string    = '"' >> *~char_('"') >> '"';
        tag              = '[' >> +alnum >> quoted_string >> ']';
        header           = +tag;
        regular_move     = lit("O-O-O") | "O-O" | (+char_("a-hNBRQK") >> +char_("a-h1-8x=NBRQK") >> -lit("e.p."));
        single_move      = raw [ regular_move >> -char_("+#") ];
        full_move        = uint_ 
            >> (lexeme["..." >> attr(no_move)] | "." >> single_move) 
            >> (single_move | attr(no_move))
            >> -result;

        game_description = +full_move;
        single_game      = -header >> game_description;
        games            = *single_game;

        BOOST_SPIRIT_DEBUG_NODES(
                    (tag)(header)(quoted_string)(regular_move)(single_move)
                    (full_move)(game_description)(single_game)(games)
                )
    }

  private:
    qi::rule<Iterator, pgn_tag(),              qi::space_type> tag;
    qi::rule<Iterator, std::vector<pgn_tag>,   qi::space_type> header;

    qi::rule<Iterator, game_move(),            qi::space_type> full_move;
    qi::rule<Iterator, std::vector<game_move>, qi::space_type> game_description;

    qi::rule<Iterator, pgn_game,               qi::space_type> single_game;
    qi::rule<Iterator, std::vector<pgn_game>,  qi::space_type> games;

    // lexemes
    qi::symbols<char, game_move::result_t> result;
    qi::rule<Iterator, std::string()> quoted_string;
    qi::rule<Iterator> regular_move;
    qi::rule<Iterator, std::string()> single_move;
};
}

loloof64::PgnGamesExtractor::PgnGamesExtractor(std::string inputFilePath) {
    std::ifstream inputFile(inputFilePath);
    parseInput(inputFile);
}

loloof64::PgnGamesExtractor::PgnGamesExtractor(std::istream &inputFile) { parseInput(inputFile); }

loloof64::PgnGamesExtractor::~PgnGamesExtractor() {
    // dtor
}

void loloof64::PgnGamesExtractor::parseInput(std::istream &inputFile) {
    if (inputFile.fail() || inputFile.bad())
        throw new InputFileException("Could not read the input file !");

    typedef boost::spirit::istream_iterator It;
    loloof64::pgn_parser<It> parser;
    std::vector<loloof64::pgn_game> temp_games;

    It iter(inputFile >> std::noskipws), end;

    bool success = boost::spirit::qi::phrase_parse(iter, end, parser, boost::spirit::qi::space, temp_games);

    if (success && iter == end) {
        games.swap(temp_games);
    } else {
        std::string error_fragment(iter, end);
        throw PgnParsingException("Failed to parse the input at :'" + error_fragment + "' !");
    }
}

int main() {
    loloof64::PgnGamesExtractor pge(std::cin); // "ScotchGambit.pgn"
    std::cout << "Parsed " << pge.getGames().size() << " games\n";
    for (auto& g : pge.getGames())
        for (auto& m : g.moves)
            std::cout << m.move_number << ".\t" << m.white_move << "\t" << m.black_move << "\n";
}

:

  • (boost::spirit::istream_iterator)
  • ( )
  • lexeme ( )
  • % =
  • ( raw[])
  • , , "..." ( no_move)
  • ( istream& ifstream&)

, . , ,

Parsed 6166 games
1.  e4  e5
2.  Nf3 Nc6
3.  d4  exd4
4.  Bc4 Qf6
5.  O-O d6
6.  Ng5 Nh6
7.  f4  Be7
8.  e5  Qg6
9.  exd6    cxd6
10. c3  dxc3
11. Nxc3    O-O
12. Nd5 Bd7
13. Rf3 Bg4
14. Bd3 Bxf3
15. Qxf3    f5
16. Bc4 Kh8
17. Nxe7    Nxe7
18. Qxb7    Qf6
19. Be3 Rfb8
20. Qd7 Rd8
21. Qb7 d5
22. Bb3 Nc6
23. Bxd5    Nd4
24. Rd1 Ne2+
25. Kf1 Rab8
26. Qxa7    Rxb2
27. Ne6 Qxe6
28. Bxe6    Rxd1+
29. Kf2 
1.  e4  e5
2.  Nf3 Nc6
3.  d4  exd4
4.  Bc4 Bc5
5.  Ng5 Ne5
6.  Bxf7+   Nxf7
7.  Nxf7    Bb4+
8.  c3  dxc3
9.  bxc3    Bxc3+
10. Nxc3    Kxf7
11. Qd5+    Kf8
12. Ba3+    d6
13. e5  Qg5
14. exd6    Qxd5
+2

X3.

  • (10 )
  • 7.4 3.6s (clang)
  • 11.4 6.0s (gcc5)
  • 0.80s 0.55s (clang gcc)

().

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//#define BOOST_SPIRIT_DEBUG
#ifndef PGNGAMESEXTRACTOR_HPP
#define PGNGAMESEXTRACTOR_HPP

#include <string>
#include <vector>
#include <fstream>
#include <stdexcept>

namespace loloof64 {

struct pgn_tag {
    std::string key;
    std::string value;
};

struct game_move {
    unsigned move_number;
    std::string white_move;
    std::string black_move;
    enum result_t { white_won, black_won, draw, undecided } result;
};

struct pgn_game {
    std::vector<pgn_tag> header;
    std::vector<game_move> moves;
};

class PgnGamesExtractor {
  public:
    PgnGamesExtractor(std::string inputFilePath);
    PgnGamesExtractor(std::istream &inputFile);
    /*
    Both constructos may throw PgnParsingException (if bad pgn format) and InputFileException (if missing file)
    */
    std::vector<pgn_game> getGames() const { return games; }
    virtual ~PgnGamesExtractor();

  protected:
  private:
    std::vector<pgn_game> games;
    void parseInput(std::istream &inputFile);
};

class PgnParsingException : public virtual std::runtime_error {
  public:
    PgnParsingException(std::string message) : std::runtime_error(message) {}
};

class InputFileException : public virtual std::runtime_error {
  public:
    InputFileException(std::string message) : std::runtime_error(message) {}
};
}

#endif // PGNGAMESEXTRACTOR_HPP

#include <boost/spirit/home/x3.hpp>
#include <boost/spirit/include/support_istream_iterator.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

BOOST_FUSION_ADAPT_STRUCT(loloof64::pgn_tag, key, value)
BOOST_FUSION_ADAPT_STRUCT(loloof64::game_move, move_number, white_move, black_move, result)
BOOST_FUSION_ADAPT_STRUCT(loloof64::pgn_game, header, moves)

namespace loloof64 {
    namespace pgn_parser {
        using namespace boost::spirit::x3;

        static std::string const no_move;
        static auto const result = []{
            symbols<game_move::result_t> table;
            table.add
                ("1-0",     game_move::white_won)
                ("0-1",     game_move::black_won)
                ("1/2-1/2", game_move::draw)
                ("*",       game_move::undecided);
            return table;
        }();

        static auto const quoted_string    = lexeme['"' >> *~char_('"') >> '"'];
        static auto const tag              = '[' >> +alnum >> quoted_string >> ']';
        static auto const header           = +tag;
        static auto const regular_move     = as_parser("O-O-O") | "O-O" | (+char_("a-hNBRQK") >> +char_("a-h1-8x=NBRQK") >> -lit("e.p."));
        static auto const single_move      = rule<struct single_move_, std::string> { "single_move" }
                                           = raw [ lexeme [ regular_move >> -char_("+#")] ];
        static auto const full_move        = rule<struct full_move_, game_move> { "full_move" }
                                     = uint_ 
            >> (lexeme["..." >> attr(no_move)] | "." >> single_move) 
            >> (single_move | attr(no_move))
            >> -result;

        static auto const game_description = +full_move;
        static auto const single_game      = rule<struct single_game_, pgn_game> { "single_game" }
                                           = -header >> game_description;
        static auto const games            = *single_game;
    }

}

loloof64::PgnGamesExtractor::PgnGamesExtractor(std::string inputFilePath) {
    std::ifstream inputFile(inputFilePath);
    parseInput(inputFile);
}

loloof64::PgnGamesExtractor::PgnGamesExtractor(std::istream &inputFile) { parseInput(inputFile); }

loloof64::PgnGamesExtractor::~PgnGamesExtractor() {
    // dtor
}

void loloof64::PgnGamesExtractor::parseInput(std::istream &inputFile) {
    if (inputFile.fail() || inputFile.bad())
        throw new InputFileException("Could not read the input file !");

    typedef boost::spirit::istream_iterator It;
    std::vector<loloof64::pgn_game> temp_games;

    It iter(inputFile >> std::noskipws), end;

    bool success = boost::spirit::x3::phrase_parse(iter, end, pgn_parser::games, boost::spirit::x3::space, temp_games);

    if (success && iter == end) {
        games.swap(temp_games);
    } else {
        std::string error_fragment(iter, end);
        throw PgnParsingException("Failed to parse the input at :'" + error_fragment + "' !");
    }
}

#include <iostream>

int main() {
    loloof64::PgnGamesExtractor pge("ScotchGambit.pgn");
    std::cout << "Parsed " << pge.getGames().size() << " games\n";
    for (auto& g : pge.getGames())
        for (auto& m : g.moves)
            std::cout << m.move_number << ".\t" << m.white_move << "\t" << m.black_move << "\n";
}
+3

, . , , . ? <93>, , /, - .

ascii::char, 7- .

,

using ascii::char_;

using qi::char_;
+2

Source: https://habr.com/ru/post/1619093/


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