python/step0_repl.py


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

import sys, traceback
import mal_readline

# read
def READ(str):
    return str

# eval
def EVAL(ast, env):
        #print("EVAL %s" % printer._pr_str(ast))
        return ast

# print
def PRINT(exp):
    return exp

# repl
def REP(str):
    return PRINT(EVAL(READ(str), {}))

# repl loop
while True:
    try:
        line = mal_readline.readline("user> ")
        if line == None: break
        if line == "": continue
        print(REP(line))
    except Exception as e:
        print("".join(traceback.format_exception(*sys.exc_info())))