函数或函子调用使用sprit boost解析器库规则来保存向量c ++中的值

时间:2015-05-21 05:57:40

标签: c++ boost boost-spirit

我想解析这一行并将所有十六进制值存储在仿函数中 的< 005F> < 0061>并[d 00660066> < 00660069> < 00660066006C>] 这个值在txt文件中,m逐行读取这个填充

像 005F 0061 00660066 00660069 00660066006C 所有值都应该在向量中,但它不起作用

精神规则是解析这一行是

rule<> blanks = *blank_p;
rule<> parse_int = blanks >> "<" >> int_p [AddEntry] >> ">";
rule<> parse_ints = *parse_int ;
rule<> parse_range = *parse_int >>"[" >> blanks >> *parse_int >> "]";

int status = parse (line.c_str(),
*(
     parse_range 
 )
 ).full;

我的算子就是这个

struct AddEntry
{
    vector<int> list;   
    void operator()( int integer)
    {
        list.push_back(integer);
    }
};

1 个答案:

答案 0 :(得分:2)

这是使用Spirit V2进行此操作的示例

<强> Live On Coliru

#define BOOST_SPIRIT_DEBUG
#include <boost/spirit/include/qi.hpp>
namespace qi  = boost::spirit::qi;

int main() {
    typedef std::string::const_iterator It;
    std::string const line = "<005F> <0061> [<00660066> <00660069> <00660066006C>]";

    It f = line.begin(), l = line.end();

    qi::int_parser<uintmax_t, 16> hex_int;
    qi::rule<It, uintmax_t()> braced_hex = '<' >> hex_int >> '>';
    BOOST_SPIRIT_DEBUG_NODE(braced_hex);

    std::vector<uintmax_t> list;
    bool result = qi::phrase_parse(f, l, *braced_hex >> '[' >> *braced_hex >> ']', qi::space, list);

    if (result) {
        std::cout << "Parse success: " << list.size() << "\n";

        for (auto& v : list)
            std::cout << v << " ";
    }
    else {
        std::cout << "Parse failed\n";
    }

    if (f!=l) {
        std::cout << "Remaining unparsed: '" << std::string(f,l) << "'\n";
    }
}

输出:

Parse success: 5
95 97 6684774 6684777 438093348972 

调试输出(如果已启用):

<braced_hex>
    <try><005F> <0061> [<0066</try>
    <success> <0061> [<00660066> </success>
    <attributes>[95]</attributes>
</braced_hex>
<braced_hex>
    <try><0061> [<00660066> <</try>
    <success> [<00660066> <006600</success>
    <attributes>[97]</attributes>
</braced_hex>
<braced_hex>
    <try>[<00660066> <0066006</try>
    <fail/>
</braced_hex>
<braced_hex>
    <try><00660066> <00660069</try>
    <success> <00660069> <0066006</success>
    <attributes>[6684774]</attributes>
</braced_hex>
<braced_hex>
    <try><00660069> <00660066</try>
    <success> <00660066006C>]</success>
    <attributes>[6684777]</attributes>
</braced_hex>
<braced_hex>
    <try><00660066006C>]</try>
    <success>]</success>
    <attributes>[438093348972]</attributes>
</braced_hex>
<braced_hex>
    <try>]</try>
    <fail/>
</braced_hex>

请注意,我的系统int还不足以容纳这些数字,因此解析会失败。对于最大范围,我使用intmax_t但您可以使用其他类型,包括任意精度类型:

另请注意,我不希望使用自动属性传播来使用语义操作。这在Spirit V2中非常普遍。另见