import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/gtests/nss_bogo_shim/config.h

@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Generic command line flags system for NSS BoGo shim.  This class
+// could actually in principle handle other programs. The flags are
+// defined in the consumer code.
+
+#ifndef config_h_
+#define config_h_
+
+#include <cassert>
+
+#include <iostream>
+#include <map>
+#include <memory>
+#include <queue>
+#include <string>
+#include <typeinfo>
+
+// Abstract base class for a given config flag.
+class ConfigEntryBase {
+ public:
+  ConfigEntryBase(const std::string& name, const std::string& type)
+      : name_(name), type_(type) {}
+
+  virtual ~ConfigEntryBase() {}
+
+  const std::string& type() const { return type_; }
+  virtual bool Parse(std::queue<const char*>* args) = 0;
+
+ protected:
+  bool ParseInternal(std::queue<const char*>* args, std::string* out);
+  bool ParseInternal(std::queue<const char*>* args, int* out);
+  bool ParseInternal(std::queue<const char*>* args, bool* out);
+
+  const std::string name_;
+  const std::string type_;
+};
+
+// Template specializations for the concrete flag types.
+template <typename T>
+class ConfigEntry : public ConfigEntryBase {
+ public:
+  ConfigEntry(const std::string& name, T init)
+      : ConfigEntryBase(name, typeid(T).name()), value_(init) {}
+  T get() const { return value_; }
+
+  bool Parse(std::queue<const char*>* args) {
+    return ParseInternal(args, &value_);
+  }
+
+ private:
+  T value_;
+};
+
+// The overall configuration (I.e., the total set of flags).
+class Config {
+ public:
+  enum Status { kOK, kUnknownFlag, kMalformedArgument, kMissingValue };
+
+  Config() : entries_() {}
+
+  template <typename T>
+  void AddEntry(const std::string& name, T init) {
+    entries_[name] = std::unique_ptr<ConfigEntryBase>(
+      new ConfigEntry<T>(name, init));
+  }
+
+  Status ParseArgs(int argc, char** argv);
+
+  template <typename T>
+  T get(const std::string& key) const {
+    auto e = entry(key);
+    assert(e->type() == typeid(T).name());
+    return static_cast<const ConfigEntry<T>*>(e)->get();
+  }
+
+ private:
+  static std::string XformFlag(const std::string& arg);
+
+  std::map<std::string, std::unique_ptr<ConfigEntryBase>> entries_;
+
+  const ConfigEntryBase* entry(const std::string& key) const {
+    auto e = entries_.find(key);
+    if (e == entries_.end()) return nullptr;
+    return e->second.get();
+  }
+};
+
+#endif  // config_h_