{

template<class Scanner>

struct definition

{

boost::spirit::rule<typename boost::spirit::lexeme_scanner<Scanner>::type> chr, qchr, escape_seq;

boost::spirit::rule<Scanner> string, qstring, cstring, key, value, entry, info;

definition(const info_grammar &self)

{

using namespace boost::spirit;

escape_seq = chset_p("0abfnrtv\"\'\\");

chr = (anychar_p - space_p - '\\' - '{' - '}' - '#' - '"') | ('\\' >> escape_seq);

qchr = (anychar_p - '"' - '\n' - '\\') | ('\\' >> escape_seq);

string = lexeme_d[+chr];

qstring = lexeme_d['"' >> *qchr >> '"'];

cstring = lexeme_d['"' >> *qchr >> '"' >> '\\'];

key = string | qstring;

value = string | qstring | (+cstring >> qstring) | eps_p;

entry = key >> value >> !('{' >> *entry >> '}');

info = *entry >> end_p;

// Debug nodes

BOOST_SPIRIT_DEBUG_NODE(escape_seq);

BOOST_SPIRIT_DEBUG_NODE(chr);

BOOST_SPIRIT_DEBUG_NODE(qchr);

BOOST_SPIRIT_DEBUG_NODE(string);

BOOST_SPIRIT_DEBUG_NODE(qstring);

BOOST_SPIRIT_DEBUG_NODE(key);

BOOST_SPIRIT_DEBUG_NODE(value);

BOOST_SPIRIT_DEBUG_NODE(entry);

BOOST_SPIRIT_DEBUG_NODE(info);

}

const boost::spirit::rule<Scanner> &start() const

{

return info;

}

};

{

using namespace boost::spirit;

// Parse and display result

info_grammar g;

parse_info<const char *> pi = parse(s, g, space_p | comment_p(";"));

std::cout << "Parse result: " << (pi.hit ? "Success" : "Failure") << "\n";

{

// Sample data 1

const char *data1 =

"\n"

"key1 data1\n"

"{\n"

"\tkey data\n"

"}\n"

"key2 \"data2 \" {\n"

"\tkey data\n"

"}\n"

"key3 \"data\"\n"

"\t \"3\" {\n"

"\tkey data\n"

"}\n"

"\n"

"\"key4\" data4\n"

"{\n"

"\tkey data\n"

"}\n"

"\"key.5\" \"data.5\" { \n"

"\tkey data \n"

"}\n"

"\"key6\" \"data\"\n"

"\t \"6\" {\n"

"\tkey data\n"

"}\n"

" \n"

"key1 data1\n"

"{\n"

"\tkey data\n"

"}\n"

"key2 \"data2 \" {\n"

"\tkey data\n"

"}\n"

"key3 \"data\"\n"

"\t \"3\" {\n"

"\tkey data\n"

"}\n"

"\n"

"\"key4\" data4\n"

"{\n"

"\tkey data\n"

"}\n"

"\"key.5\" \"data.5\" {\n"

"\tkey data\n"

"}\n"

"\"key6\" \"data\"\n"

"\t \"6\" {\n"

"\tkey data\n"

"}\n"

"\\\\key\\t7 data7\\n\\\"data7\\\"\n"

"{\n"

"\tkey data\n"

"}\n"

"\"\\\\key\\t8\" \"data8\\n\\\"data8\\\"\"\n"

"{\n"

"\tkey data\n"

"}\n"

"\n";

// Sample data 2

const char *data2 =

"key1\n"

"key2\n"

"key3\n"

"key4\n";

// Parse sample data

info_parse(data1);

info_parse(data2);