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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4. #include <stdexcept>
  5.  
  6. #include <lua.hpp>
  7.  
  8.  
  9. class Interpreter {
  10.   public:
  11.     // initialize lua and import libraries; handle error
  12.     Interpreter() {
  13.       luaState = luaL_newstate();
  14.  
  15.       if(!luaState)
  16.         throw std::runtime_error("initializing lua failed");
  17.  
  18.       luaL_openlibs(luaState);
  19.     }
  20.  
  21.     ~Interpreter() {
  22.       lua_close(luaState);
  23.     }
  24.  
  25.     // executes a string in the current lua state
  26.     void executeCommand(std::string command) {
  27.       bool err = luaL_dostring(luaState, command.c_str());
  28.  
  29.       if(err)
  30.         reportError();
  31.     }
  32.  
  33.     // executes a file in the current lua state
  34.     void executeFile(std::string file) {
  35.       bool err = luaL_loadfile(luaState, file.c_str());
  36.  
  37.       // could not load file
  38.       if(err)
  39.         reportError();
  40.  
  41.       else {
  42.         bool err = lua_pcall(luaState, 0, 0, 0);
  43.  
  44.         // could not execute file
  45.         if(err)
  46.           reportError();
  47.       }
  48.     }
  49.  
  50.   private:
  51.     lua_State* luaState;
  52.  
  53.     // get error from top of stack, pop it from the stack and report it
  54.     void reportError() {
  55.       std::string err = lua_tostring(luaState, -1);
  56.       lua_pop(luaState, 1);
  57.  
  58.       std::cerr << err << std::endl;
  59.     }
  60. };
  61.  
  62.  
  63. int main(int argc, char** argv) {
  64.   std::vector<std::string> args(argv, argv + argc);
  65.  
  66.   if(args.size() != 3) {
  67.     std::cerr << "usage:\n ./a.out -cmd command\n ./a.out -file file" << std::endl;
  68.   } else {
  69.     // throws on failed initialization, see above
  70.     Interpreter li;
  71.  
  72.     if(args[1] == "-cmd")
  73.       li.executeCommand(args[2]);
  74.     else if(args[1] == "-file")
  75.       li.executeFile(args[2]);
  76.   }
  77. }
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https://ideone.com/NyqObv
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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