cs/step0_repl.cs

   1 using System;
   2 using System.IO;
   3 using Mal;
   4
   5 namespace Mal {
   6     class step0_repl {
   7         // read
   8         static string READ(string str) {
   9             return str;
  10         }
  11
  12         // eval
  13         static string EVAL(string ast, string env) {
  14             return ast;
  15         }
  16
  17         // print
  18         static string PRINT(string exp) {
  19             return exp;
  20         }
  21
  22         // REPL
  23         static string RE(string env, string str) {
  24             return EVAL(READ(str), env);
  25         }
  26
  27         static void Main(string[] args) {
  28             string prompt = "user> ";
  29
  30             while (true) {
  31                 string line;
  32                 try {
  33                     line = Mal.readline.Readline(prompt);
  34                     if (line == null) { break; }
  35                 } catch (IOException e) {
  36                     Console.WriteLine("IOException: " + e.Message);
  37                     break;
  38                 }
  39                 Console.WriteLine(PRINT(RE(null, line)));
  40             }
  41         }
  42     }
  43 }