Add CommandLine for easier command line parsing

engine/core/command_line.h

@@ -0,0 +1,74 @@
+/*
+Copyright (c) 2013 Daniele Bartolini, Michele Rossi
+Copyright (c) 2012 Daniele Bartolini, Simone Boscaratto
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#pragma once
+
+#include "string_utils.h"
+
+namespace crown
+{
+
+/// Helper for parsing command line.
+struct CommandLine
+{
+	CommandLine(int argc, char** argv)
+		: _argc(argc)
+		, _argv(argv)
+	{
+	}
+
+	int find_argument(const char* longopt, char shortopt)
+	{
+		for (int i = 0; i < _argc; i++)
+		{
+			if ((shortopt != '\0' && string::strlen(_argv[i]) > 1 && _argv[i][0] == '-' && _argv[i][1] == shortopt) ||
+				(string::strlen(_argv[i]) > 2 && _argv[i][0] == '-' && _argv[i][1] == '-' && string::strcmp(&_argv[i][2], longopt) == 0))
+			{
+				return i;
+			}
+		}
+
+		return _argc;
+	}
+
+	const char* get_parameter(const char* longopt, char shortopt = '\0')
+	{
+		int argc = find_argument(longopt, shortopt);
+		return argc < _argc ? _argv[argc + 1] : NULL;
+	}
+
+	bool has_argument(const char* longopt, char shortopt = '\0')
+	{
+		return find_argument(longopt, shortopt) < _argc;
+	}
+
+private:
+
+	int _argc;
+	char** _argv;
+};
+
+} // namespace crown