added Engine class to hold the state of the engine

git-svn-id: svn://anubis/anaglym/trunk@30 99a6e188-d820-4881-8870-2d33a10e2619

ag.cc

@@ -103,7 +103,7 @@ namespace ag
                 size_t pos = modelname.find_first_not_of(FILENAME_SAFE_CHARS);
                 if (pos == string::npos)
                 {
-                    string path = locateResource(modelname);
+                    string path = g_engine->locateResource(modelname);
                     if (path != "")
                     {
                         WFObj * obj = new WFObj();
@@ -121,13 +121,13 @@ namespace ag
 
     int videoStart(lua_State * L)
     {
-        g_video->start();
+        g_engine->getVideo()->start();
         return 0;
     }
 
     int videoStop(lua_State * L)
     {
-        g_video->stop();
+        g_engine->getVideo()->stop();
         return 0;
     }
 

anaglym.cc

@@ -1,17 +1,25 @@
 
 #include "ag.h"
 #include "Video.h"
+#include "anaglym.h"
 #include <lua.hpp>
 #include <stdlib.h>                 /* exit() */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
 #include <iostream>
 #include <string>
 using namespace std;
 
 static void usage();
-static void report_errors(lua_State * L, int status);
-static void register_libraries(lua_State * L);
 
-Video * g_video = NULL;
+Engine * g_engine;
+
+static void usage()
+{
+    cerr << "Usage: anaglym [options] program.lua[c]" << endl;
+    exit(42);
+}
 
 int main(int argc, char * argv[])
 {
@@ -41,18 +49,51 @@ int main(int argc, char * argv[])
         usage();
     }
 
-    g_video = new Video();
+    g_engine = new Engine();
+    g_engine->load(program);
+    g_engine->run();
+    delete g_engine;
 
-    lua_State * L = lua_open();
+    return 0;
+}
 
-    register_libraries(L);
+void Engine::reportErrors(int status)
+{
+    if (status != 0)
+    {
+        cerr << "Engine: Error: " << lua_tostring(m_luaState, -1) << endl;
+        lua_pop(m_luaState, 1); // remove error message
+    }
+}
 
-    int s = luaL_loadfile(L, program);
+Engine::Engine()
+{
+    m_video = new Video();
+}
+
+Engine::~Engine()
+{
+    delete m_video;
+}
+
+bool Engine::load(const char * program)
+{
+    m_program_path = program;
+    size_t pos = m_program_path.find_last_of("/\\");
+    m_program_path = (pos != string::npos)
+                        ? m_program_path.substr(0, pos)
+                        : ".";
+
+    m_luaState = lua_open();
+
+    registerLibraries();
+
+    int s = luaL_loadfile(m_luaState, program);
 
     if ( s == 0 )
     {
         // execute Lua program
-        s = lua_pcall(L, 0, LUA_MULTRET, 0);
+        s = lua_pcall(m_luaState, 0, LUA_MULTRET, 0);
     }
     else
     {
@@ -60,48 +101,48 @@ int main(int argc, char * argv[])
         return 1;
     }
 
-    report_errors(L, s);
-    lua_close(L);
-
-    delete g_video;
-
-    return 0;
+    reportErrors(s);
+    lua_close(m_luaState);
 }
 
-static void report_errors(lua_State * L, int status)
-{
-    if ( status!=0 )
-    {
-        cerr << "-- " << lua_tostring(L, -1) << endl;
-        lua_pop(L, 1); // remove error message
-    }
-}
-
-static void usage()
-{
-    cerr << "Usage: anaglym [options] program.lua[c]" << endl;
-    exit(42);
-}
-
-static void register_libraries(lua_State * L)
+void Engine::registerLibraries()
 {
     /* Load the Lua string library */
-    lua_pushcfunction(L, luaopen_string);
-    lua_pcall(L, 0, 0, 0);
+    lua_pushcfunction(m_luaState, luaopen_string);
+    lua_pcall(m_luaState, 0, 0, 0);
 
     /* Load the Lua math library */
-    lua_pushcfunction(L, luaopen_math);
-    lua_pcall(L, 0, 0, 0);
+    lua_pushcfunction(m_luaState, luaopen_math);
+    lua_pcall(m_luaState, 0, 0, 0);
 
     /* Load the Lua table library */
-    lua_pushcfunction(L, luaopen_table);
-    lua_pcall(L, 0, 0, 0);
+    lua_pushcfunction(m_luaState, luaopen_table);
+    lua_pcall(m_luaState, 0, 0, 0);
 
-    ag::register_functions(L);
+    ag::register_functions(m_luaState);
 }
 
-string locateResource(const string & shortname)
+string Engine::locateResource(const string & shortname)
 {
-    /* TODO: fill in */
+    string try_path;
+
+    try_path = m_program_path + "/" + shortname;
+    if (fileExists(try_path))
+        return try_path;
+
     return "";
 }
+
+bool Engine::fileExists(const string & path)
+{
+    struct stat st;
+    if (stat(path.c_str(), &st) == 0)
+    {
+        return S_ISREG(st.st_mode) && (st.st_size > 0);
+    }
+    return false;
+}
+
+void Engine::run()
+{
+}

anaglym.h

@@ -3,11 +3,32 @@
 #define ANAGLYM_H
 
 #include <string>
+#include <lua.hpp>
 #include "Video.h"
 
 #define FILENAME_SAFE_CHARS "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-"
 
+class Engine
+{
+    public:
+        Engine();
+        ~Engine();
+
         std::string locateResource(const std::string & shortname);
-extern Video * g_video;
+        Video * getVideo() { return m_video; }
+        bool load(const char * program);
+        void run();
+        void reportErrors(int status);
+
+    protected:
+        void registerLibraries();
+        bool fileExists(const std::string & path);
+
+        lua_State * m_luaState;
+        Video * m_video;
+        std::string m_program_path;
+};
+
+extern Engine * g_engine;
 
 #endif