Panda3D

executionEnvironment.h

00001 // Filename: executionEnvironment.h
00002 // Created by:  drose (15May00)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef EXECUTIONENVIRONMENT_H
00016 #define EXECUTIONENVIRONMENT_H
00017 
00018 #include "dtoolbase.h"
00019 
00020 #include "vector_string.h"
00021 #include "filename.h"
00022 
00023 #include <map>
00024 
00025 ////////////////////////////////////////////////////////////////////
00026 //       Class : ExecutionEnvironment
00027 // Description : Encapsulates access to the environment variables and
00028 //               command-line arguments at the time of execution.
00029 //               This is encapsulated to support accessing these
00030 //               things during static init time, which seems to be
00031 //               risky at best.
00032 ////////////////////////////////////////////////////////////////////
00033 class EXPCL_DTOOL ExecutionEnvironment {
00034 private:
00035   ExecutionEnvironment();
00036 
00037 PUBLISHED:
00038   INLINE static bool has_environment_variable(const string &var);
00039   INLINE static string get_environment_variable(const string &var);
00040   INLINE static void set_environment_variable(const string &var, const string &value);
00041 
00042   INLINE static void shadow_environment_variable(const string &var, const string &value);
00043   INLINE static void clear_shadow(const string &var);
00044 
00045   static string expand_string(const string &str);
00046 
00047   INLINE static int get_num_args();
00048   INLINE static string get_arg(int n);
00049 
00050   INLINE static string get_binary_name();
00051   INLINE static string get_dtool_name();
00052 
00053   static Filename get_cwd();
00054 
00055 private:
00056   bool ns_has_environment_variable(const string &var) const;
00057   string ns_get_environment_variable(const string &var) const;
00058   void ns_set_environment_variable(const string &var, const string &value);
00059   void ns_shadow_environment_variable(const string &var, const string &value);
00060   void ns_clear_shadow(const string &var);
00061 
00062   int ns_get_num_args() const;
00063   string ns_get_arg(int n) const;
00064 
00065   string ns_get_binary_name() const;
00066   string ns_get_dtool_name() const;
00067 
00068   static ExecutionEnvironment *get_ptr();
00069 
00070   void read_environment_variables();
00071   void read_args();
00072 
00073 private:
00074   typedef map<string, string> EnvironmentVariables;
00075   EnvironmentVariables _variables;
00076 
00077   typedef vector_string CommandArguments;
00078   CommandArguments _args;
00079 
00080   string _binary_name;
00081   string _dtool_name;
00082 
00083   static ExecutionEnvironment *_global_ptr;
00084 };
00085 
00086 #include "executionEnvironment.I"
00087 
00088 #endif
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