sc.cpp

来自「一个在linux下的shell的计算器」· C++ 代码 · 共 112 行

/*
 *
 *
 *
 */

#include <iostream>
#include <cstdlib>
#include <readline/readline.h>
#include <readline/history.h>
#include "sc.h"

using namespace std;

//
//
//
void DisplayBanner()
{
 cout << endl;
 cout << "SC " << SCVERSION << ", the shell calculator by SD" << endl;
 cout << endl;
}

//
//
//
bool GetReadline(string prompt, string & line)
{
#ifdef USE_READLINE
 char *buf = readline(prompt.c_str());
 if (buf == NULL) return false;
 line = string(buf);
 free(buf); 
 return true;
#else
 cout << prompt;
 getline(cin, line);
 return true;
#endif
}

//
//
//
void InteractiveMode(Interpreter & sc)
{
 string str;
 bool inLoop = true;
 DisplayBanner();
 while (inLoop)
 {
  if (!GetReadline(sc.GetPrompt(), str))
  {
   cout << endl;
   break;
  }
  try
  {
   inLoop = !sc.Execute(str);
   #ifdef USE_READLINE
   if (inLoop) add_history(str.c_str());
   #endif
  }
  catch (Exception *ex)
  {
   cerr << ex->ToString() << endl;
   delete ex;
  };
  sc.DisplayStack(10);
 }
}

//
//
//
void BatchMode(Interpreter & sc, int ncmd, char *cmd[])
{
 int i;
 string str;
 for (i=1;i<ncmd;i++)
 {
  str = string(cmd[i]);
  try
  {
   sc.Execute(str); 
  }
  catch(Exception *ex)
  {
   cerr << ex->ToString() << endl;
   delete ex;
  } 
 }
}

//
//
//
int main(int argc, char *argv[])
{
 Interpreter sc;

 srand48(long(time(NULL)));

 if (argc == 1) InteractiveMode(sc);
 else BatchMode(sc, argc, argv);
 
 if (sc.stack.Length() > 0) cout << sc.GetResult() << endl;
 return 0;
}