ts/step1_read_print.ts

   1 import { readline } from "./node_readline";
   2
   3 import { MalType } from "./types";
   4 import { readStr } from "./reader";
   5 import { prStr } from "./printer";
   6
   7 // READ
   8 function read(str: string): MalType {
   9     return readStr(str);
  10 }
  11
  12 // EVAL
  13 function evalMal(ast: any, _env?: any): any {
  14     // TODO
  15     return ast;
  16 }
  17
  18 // PRINT
  19 function print(exp: MalType): string {
  20     return prStr(exp);
  21 }
  22
  23 function rep(str: string): string {
  24     return print(evalMal(read(str)));
  25 }
  26
  27 while (true) {
  28     const line = readline("user> ");
  29     if (line == null) {
  30         break;
  31     }
  32     if (line === "") {
  33         continue;
  34     }
  35     try {
  36         console.log(rep(line));
  37     } catch (e) {
  38         const err: Error = e;
  39         console.error(err.message);
  40     }
  41 }