Panda3D
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configVariableSearchPath.cxx
00001 // Filename: configVariableSearchPath.cxx
00002 // Created by:  drose (21Oct04)
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 #include "configVariableSearchPath.h"
00016 #include "executionEnvironment.h"
00017 
00018 ////////////////////////////////////////////////////////////////////
00019 //     Function: ConfigVariableSearchPath::reload_search_path
00020 //       Access: Private
00021 //  Description: Recopies the config variable into the search path for
00022 //               returning its value.
00023 ////////////////////////////////////////////////////////////////////
00024 void ConfigVariableSearchPath::
00025 reload_search_path() {
00026   nassertv(_core != (ConfigVariableCore *)NULL);
00027   mark_cache_valid(_local_modified);
00028   _cache.clear();
00029 
00030   _cache.append_path(_prefix);
00031   int num_unique_references = _core->get_num_unique_references();
00032   for (int i = 0; i < num_unique_references; i++) {
00033     const ConfigDeclaration *decl = _core->get_unique_reference(i);
00034     const ConfigPage *page = decl->get_page();
00035 
00036     Filename page_filename(page->get_name());
00037     Filename page_dirname = page_filename.get_dirname();
00038     ExecutionEnvironment::shadow_environment_variable("THIS_PRC_DIR", page_dirname.to_os_specific());
00039     string expanded = ExecutionEnvironment::expand_string(decl->get_string_value());
00040     ExecutionEnvironment::clear_shadow("THIS_PRC_DIR");
00041     if (!expanded.empty()) {
00042       Filename dir = Filename::from_os_specific(expanded);
00043       dir.make_true_case();
00044       _cache.append_directory(dir);
00045     }
00046   }
00047 
00048   if (_prefix.is_empty() && _postfix.is_empty() && 
00049       num_unique_references == 0) {
00050     // An empty search path implicitly has the default value.
00051     _cache = _default_value;
00052   }
00053 
00054   _cache.append_path(_postfix);
00055 }
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