start option description

src/cxxopts.cpp

@@ -0,0 +1,61 @@
+#include "cxxopts.hpp"
+
+namespace cxxopts
+{
+
+  std::basic_regex<char> option_matcher
+    ("--([[:alpha:]][-_[:alpha:]]+)(=(.*))?|-([a-zA-Z]+)");
+
+  std::basic_regex<char> option_specifier
+    ("(([a-zA-Z]),)?([a-zA-Z][-_a-zA-Z]+)");
+
+OptionAdder
+Options::add_options()
+{
+  return OptionAdder(*this);
+}
+
+OptionAdder&
+OptionAdder::operator()
+( 
+  const std::string& opts, 
+  const std::string& desc
+)
+{
+  std::match_results<const char*> result;
+  std::regex_match(opts.c_str(), result, option_specifier);
+
+  if (result.empty())
+  {
+    throw invalid_option_format_error(opts);
+  }
+
+  const auto& s = result[2];
+  const auto& l = result[3];
+
+  auto option = std::make_shared<OptionDetails>(desc);
+
+  if (s.length() != 0)
+  {
+    auto result = m_options.m_short.insert(std::make_pair(s.str()[0], option));
+
+    if (!result.second)
+    {
+      throw option_exists_error(s.str());
+    }
+  }
+
+  if (l.length() != 0)
+  {
+    auto result = m_options.m_long.insert(std::make_pair(l, option));
+
+    if (!result.second)
+    {
+      throw option_exists_error(l.str());
+    }
+  }
+
+  return *this;
+}
+
+}

src/cxxopts.hpp

@@ -1,5 +1,7 @@
 #include <regex>
 #include <set>
+#include <map>
+#include <exception>
 
 namespace cxxopts
 {
@@ -7,8 +9,60 @@ namespace cxxopts
 
   extern std::basic_regex<char> option_specifier;
 
+  class OptionException : public std::exception
+  {
+  };
+
+  class option_exists_error : public OptionException
+  {
+    public:
+    option_exists_error(const std::string& option)
+    {
+      m_message = u8"Option ‘" + option + u8"’ already exists";
+    }
+
+    const char*
+    what() const noexcept
+    {
+      return m_message.c_str();
+    }
+
+    private:
+    std::string m_message;
+  };
+
+  class invalid_option_format_error : public OptionException
+  {
+    public:
+    invalid_option_format_error(const std::string& format)
+    {
+      m_message = u8"Invalid option format ‘" + format + u8"’";
+    }
+
+    const char*
+    what() const noexcept
+    {
+      return m_message.c_str();
+    }
+
+    private:
+    std::string m_message;
+  };
+
   class OptionAdder;
 
+  class OptionDetails
+  {
+    public:
+    OptionDetails(const std::string& description)
+    : m_desc(description)
+    {
+    }
+
+    private:
+    std::string m_desc;
+  };
+
   class Options
   {
     public:
@@ -22,8 +76,8 @@ namespace cxxopts
     private:
     friend class OptionAdder;
 
-    std::set<char32_t> m_short;
+    std::map<char, std::shared_ptr<OptionDetails>> m_short;
-    std::set<std::string> m_long;
+    std::map<std::string, std::shared_ptr<OptionDetails>> m_long;
   };
 
   class OptionAdder

src/main.cpp

@@ -1,21 +1,15 @@
+#include <codecvt>
 #include <iostream>
 #include <locale>
+#include <sstream>
 
 #include "cxxopts.hpp"
 
 int main(int argc, char* argv[])
 {
-  std::locale::global(std::locale(""));
   try
   {
 
-  cxxopts::option_matcher.imbue(std::locale(""));
-  cxxopts::option_matcher.assign
-    ("--([[:alpha:]][-_[:alpha:]]+)(=(.*))?|-([a-zA-Z]+)", 
-     std::regex_constants::extended | std::regex_constants::ECMAScript | 
-       std::regex_constants::collate);
-  std::cout << cxxopts::option_matcher.getloc().name() << std::endl;
-
   std::match_results<const char*> result;
 
   for (int i = 1; i < argc; ++i)
@@ -32,6 +26,13 @@ int main(int argc, char* argv[])
     }
   }
 
+  cxxopts::Options options;
+
+  options.add_options()
+    ("a,apple", "an apple")
+    ("b,bob", "Bob")
+  ;
+
   } catch (const std::regex_error& e)
   {
     std::cout << "regex_error: " << e.what() << std::endl;