Added programopts

1 files changed, 84 insertions, 0 deletions

diff --git a/programopts.cpp b/programopts.cpp
new file mode 100644
index 0000000..81f1be9
--- /dev/null
+++ b/programopts.cpp
@@ -0,0 +1,84 @@
+#include "programopts.h"
+
+#include <algorithm>
+#include <iterator>
+
+using namespace std::string_literals;
+
+namespace {
+ struct PrefixCmp
+ {
+  bool operator()(const std::string& lhs, const std::string& rhs) const
+  {
+   return !(lhs.starts_with(rhs) || rhs.starts_with(lhs)) && lhs < rhs;
+  }
+ };
+}
+
+struct Reichwein::ProgramOpts::impl
+{
+ int m_argc;
+ char** m_argv;
+ std::string m_programName;
+ std::vector<std::string> m_parameters;
+ std::map<std::string, std::function<bool(const std::string&)>, PrefixCmp> m_option_prefixes;
+};
+
+Reichwein::ProgramOpts::ProgramOpts(int argc, char* argv[], std::map<std::string, std::function<bool(const std::string&)>>& option_prefixes):
+ m_pimpl(std::make_unique<impl>())
+{
+ m_pimpl->m_argc = argc;
+ m_pimpl->m_argv = argv;
+ if (m_pimpl->m_argc >= 1)
+  m_pimpl->m_programName = m_pimpl->m_argv[0];
+ //std::copy(option_prefixes.begin(), option_prefixes.end(), std::inserter(m_pimpl->m_option_prefixes, std::next(m_pimpl->m_option_prefixes.begin())));
+}
+
+Reichwein::ProgramOpts::~ProgramOpts()
+{
+}
+
+void Reichwein::ProgramOpts::process()
+{
+ for (int i = 1; i < m_pimpl->m_argc; i++) {
+  std::string arg{ m_pimpl->m_argv[i] };
+  if (arg.size() == 0)
+   throw std::runtime_error("Empty option #"s + std::to_string(i));
+
+  if (arg[0] != '-') { // non-option parameter
+   m_pimpl->m_parameters.push_back(arg);
+  } else {
+   auto prefix_iterator = m_pimpl->m_option_prefixes.find(arg);
+   if (prefix_iterator == m_pimpl->m_option_prefixes.end())
+    throw std::runtime_error("Unknown option: "s + arg);
+   auto& [prefix, f] = *prefix_iterator;
+   std::string optional_parameter;
+   bool parameter_provided{ false };
+
+   if (prefix.size() < arg.size()) {
+    optional_parameter = arg.substr(prefix.size());
+   } else {
+    if (i < m_pimpl->m_argc - 1)
+     optional_parameter = m_pimpl->m_argv[i + 1];
+    if (optional_parameter.size() > 0 && optional_parameter[0] == '-')
+     optional_parameter = "";
+    else
+     parameter_provided = true;
+   }
+   bool parameter_consumed = f(optional_parameter); // call the function from the map
+   if (parameter_provided && parameter_consumed)
+    i++; // skip parameter
+  }
+ }
+}
+
+std::string Reichwein::ProgramOpts::programName()
+{
+ return m_pimpl->m_programName;
+}
+
+std::vector<std::string> Reichwein::ProgramOpts::nonOptionArguments()
+{
+ return m_pimpl->m_parameters;
+}
+