git.sesse.net Git - casparcg/blob - common/param.h

   1 #pragma once
   2
   3 #include "except.h"
   4
   5 #include <boost/lexical_cast.hpp>
   6 #include <boost/algorithm/string.hpp>
   7
   8 #include <type_traits>
   9 #include <string>
  10
  11 namespace caspar {
  12
  13 class param_comparer
  14 {
  15         const std::wstring& lhs;
  16 public:
  17         explicit param_comparer(const std::wstring& p) : lhs(p) {}
  18         bool operator()(const std::wstring& rhs) { return boost::iequals(lhs, rhs); }
  19 };
  20
  21 template<typename C>
  22 bool contains_param(const std::wstring& name, C&& params)
  23 {
  24         return std::find_if(params.begin(), params.end(), param_comparer(name)) != params.end();
  25 }
  26
  27 template<typename C>
  28 void replace_placeholders(const std::wstring& placeholder, const std::wstring& replacement, C&& params)
  29 {
  30         for (auto& param : params)
  31                 boost::ireplace_all(param, placeholder, replacement);
  32 }
  33
  34 static std::vector<std::wstring> protocol_split(const std::wstring& s)
  35 {
  36         std::vector<std::wstring> result;
  37         size_t pos;
  38
  39         if ((pos = s.find(L"://")) != std::wstring::npos)
  40         {
  41                 result.push_back(s.substr(0, pos));
  42                 result.push_back(s.substr(pos + 3));
  43         }
  44         else
  45         {
  46                 result.push_back(L"");
  47                 result.push_back(s);
  48         }
  49
  50         return result;
  51 }
  52
  53 template<typename T, typename C>
  54 typename std::enable_if<!std::is_convertible<T, std::wstring>::value, typename std::decay<T>::type>::type get_param(const std::wstring& name, C&& params, T fail_value = T())
  55 {
  56         auto it = std::find_if(std::begin(params), std::end(params), param_comparer(name));
  57         if(it == params.end())
  58                 return fail_value;
  59
  60         try
  61         {
  62                 if(++it == params.end())
  63                         throw std::out_of_range("");
  64
  65                 return boost::lexical_cast<typename std::decay<T>::type>(*it);
  66         }
  67         catch(...)
  68         {
  69                 CASPAR_THROW_EXCEPTION(user_error() << msg_info(L"Failed to parse param " + name) << nested_exception(std::current_exception()));
  70         }
  71 }
  72
  73 template<typename C>
  74 std::wstring get_param(const std::wstring& name, C&& params, const std::wstring& fail_value = L"")
  75 {
  76         auto it = std::find_if(std::begin(params), std::end(params), param_comparer(name));
  77         if(it == params.end())
  78                 return fail_value;
  79
  80         try
  81         {
  82                 if(++it == params.end())
  83                         throw std::out_of_range("");
  84
  85                 return *it;
  86         }
  87         catch(...)
  88         {
  89                 CASPAR_THROW_EXCEPTION(user_error() << msg_info(L"Failed to parse param " + name) << nested_exception(std::current_exception()));
  90         }
  91 }
  92
  93 }