提升program_options部分键匹配 [英] Boost program_options partial key match
问题描述
我正在尝试使用Boost :: program_options读取配置文件.配置文件如下:
I'm trying to read config files with Boost::program_options. The config files look like:
hier.arch.y.option_name = 0x5
another.hier.archy.setting_name = 0x1E
我希望能够仅通过"option_name"或"setting_name"进行搜索.我不太担心重复项,但是如果有一种方法可以选择匹配2个子字符串(即另一个" +设置名称"),那也很好.
I want to be able to search by just "option_name" or "setting_name". I'm not worried too much about duplicates but if there's a way optionally to match 2 substrings (i.e. "another" + "setting_name") that'd be great too.
有没有一种方法可以使program_options基于子字符串进行匹配?
Is there a way to get program_options to match based on substring?
代码示例:
namespace po = boost::program_options;
po::options_description cmd_opts{"Options"};
po::options_description config_file_opts;
cmd_opts.add_options()
("help,h", "Help message")
("config_help", "List of configurations available in config file");
po::variables_map vm;
po::store(parse_command_line(argc, argv, combined_opts), vm);
auto parsed_opts = po::parse_config_file<char>(vm.["config_file"].as<std::string>);
po::store(parsed_opts, vm);
配置文件:
foo.bar.setting0 = 0x5
foo.notbar.setting1 = 0x6
bar.notfoo.setting2 = 0x5E
我想分配以下选项:
int setting0;
int setting1;
int setting2;
推荐答案
问枚举已解析的选项是什么意思?
Q. What does enumerate the parsed options mean?
A. 在Coliru上直播
A. Live On Coliru
for (auto& opt : parsed_opts.options) {
for (auto& val : opt.value) {
std::cout
<< std::quoted(opt.string_key) << "\t-> "
<< std::quoted(val) << std::endl;
}
}
打印
"foo.bar.setting0" -> "0x5"
"foo.notbar.setting1" -> "0x6"
"bar.notfoo.setting2" -> "0x5E"
模糊匹配,听起来像是正则表达式工作吗?
Matching fuzzily, sounds like a regex job, maybe?
Live On Coliru
int setting0 = 0, setting1 = 0, setting2 = 0;
struct { int& target; boost::regex re; }
fuzzy_opt_desc[] = {
{ setting0, boost::regex{R"(bar\.setting0$)"} },
{ setting1, boost::regex{R"(^foo\..*?setting1$)"} },
{ setting2, boost::regex{R"(setting2$)"} },
};
for (auto& opt : parsed_opts.options) {
for (auto const& desc : fuzzy_opt_desc) {
if (boost::regex_search(opt.string_key, desc.re)) {
for (auto& val : opt.value) {
desc.target = std::stoul(val, nullptr, 16);
std::cout
<< std::quoted(opt.string_key) << "\t-> "
<< desc.target << std::endl;
}
}
} }
std::cout << "Finally: " << setting0 << ", " << setting1 << ", " << setting2 << "\n";
打印
"foo.bar.setting0" -> 5
"foo.notbar.setting1" -> 6
"bar.notfoo.setting2" -> 94
Finally: 5, 6, 94
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