first commit

2022-10-20 20:29:11 +08:00
commit 4d531f8044
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+// ArgumentParser.cxx -- flightgear viewer argument parser
+//
+// Copyright (C) 2021 by Erik Hofman
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+
+#include <cstring>
+#include <iostream>
+#include <string>
+#include <map>
+
+#include "ArgumentParser.hxx"
+
+ArgumentParser::ArgumentParser(int argc, char **argv) :
+   arg_num(argc),
+   arg_values(argv),
+   appName(argv[0]),
+   arguments( osg::ArgumentParser(&arg_num, arg_values) )
+{
+    for (int i=1; i<argc; i++)
+    {
+        std::string arg = argv[i];
+        std::string val;
+
+        if (arg[0] == '-')
+        {
+            std::size_t pos = arg.find('='); 
+            if (pos != std::string::npos)
+            {
+                val = arg.substr(pos+1);
+                arg = arg.substr(0, pos);
+            }
+            else if ((i+1)<argc && argv[i+1][0] != '-') {
+                val = argv[++i];
+            } else {
+                val = "";
+            }
+
+            args[arg] = val;
+        }
+        else {
+            files.push_back(arg);
+        }
+    }
+}
+
+bool
+ArgumentParser::read(const char *arg)
+{
+    auto it = args.find(arg);
+    if (it != args.end())
+    {
+        args.erase(it);
+        return true;
+    }
+    return false;
+}
+
+bool
+ArgumentParser::read(const char *arg, std::string& value)
+{
+    auto it = args.find(arg);
+    if (it != args.end())
+    {
+        value = it->second;
+        args.erase(it);
+        return true;
+    }
+    return false;
+}
+ 
+bool
+ArgumentParser::read(const char *arg, std::string& name, std::string& value)
+{
+    auto it = args.find(arg);
+
+    // old fgviewer behavior: --prop name=value
+    if (it != args.end()) {
+        std::string str = it->second;
+
+        std::size_t pos = str.find("=");
+        if (pos != std::string::npos && pos != str.size())
+        {
+            value = str.substr(pos);
+            name = str.substr(0, pos);
+            args.erase(it);
+            return true;
+        }
+    }
+
+    // FlightGear behavior: --prop:name=value
+    std::string str = name;
+    str += ':'; 
+    str += name;
+
+    it = args.find(str);
+    if (it != args.end())
+    {
+        value = it->second;
+        args.erase(it);
+        return true;
+    }
+
+    return false;
+}
+
+void
+ArgumentParser::reportRemainingOptionsAsUnrecognized()
+{
+   for (auto it : args) {
+      std::cerr << "Unsupported argument: " << it.first << std::endl;
+   }
+}
+
+
+void
+ArgumentParser::writeErrorMessages(std::ostream& output)
+{
+}