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mal/python/step1_read_print.py

33 lines
657 B
Python

import sys, traceback
import mal_readline
import mal_types as types
import reader, printer
# read
def READ(str):
return reader.read_str(str)
# eval
def EVAL(ast, env):
#print("EVAL %s" % printer._pr_str(ast))
return ast
# print
def PRINT(exp):
return printer._pr_str(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 reader.Blank: continue
except Exception as e:
print("".join(traceback.format_exception(*sys.exc_info())))