1 | #include <iostream>
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2 | #include <boost/spirit/include/qi.hpp>
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3 |
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4 | namespace qi = boost::spirit::qi;
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5 | using qi::omit;
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6 | using qi::repeat;
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7 | using std::cout;
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8 | using std::endl;
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9 | using qi::string;
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10 | using qi::char_;
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11 |
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12 | typedef qi::rule<std::string::const_iterator, std::string()> strrule_t;
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13 |
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14 | void test(const std::string input, strrule_t rule)
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15 | {
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16 | std::string target;
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17 | std::string::const_iterator i = input.begin(), ie = input.end();
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18 |
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19 | if (qi::parse(i, ie, rule, target))
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20 | {
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21 | cout << "Success: '" << target << "'" << endl;
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22 | }
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23 | else
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24 | {
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25 | cout << "Failed to match." << endl;
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26 | }
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27 | }
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28 |
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29 | int main()
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30 | {
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31 | strrule_t shortHexValue = repeat(4)[char_("a-fA-F0-9")];
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32 | strrule_t longHexValue = repeat(8)[char_("a-fA-F0-9")];
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33 | strrule_t hexValue1 = omit[string("0x")] >> ( longHexValue | shortHexValue );
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34 | strrule_t hexValue2 = omit[string("0x")] >> ( shortHexValue | longHexValue );
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35 |
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36 | test( "0x123FAA22", hexValue1 );
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37 | test( "0x12AA", hexValue1 );
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38 | test( "0x123FAA22", hexValue2 );
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39 | test( "0x1A22", hexValue2 );
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40 |
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41 | return 0;
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42 | }
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