1 files changed, 32 insertions, 0 deletions
diff --git a/python/step0_repl.py b/python/step0_repl.py
new file mode 100644
index 0000000..8d42c33
--- /dev/null
+++ b/python/step0_repl.py
@@ -0,0 +1,32 @@
+import sys, traceback
+import mal_readline
+
+# read
+def READ(str):
+    return str
+
+# eval
+def EVAL(ast, env):
+    # try it as an expression then a statement
+    try:
+        return eval(ast)
+    except SyntaxError:
+        exec compile(ast, '', 'single') in globals()
+        return None
+
+# print
+def PRINT(exp):
+    return exp
+
+# repl
+def REP(str):
+    return PRINT(EVAL(READ(str), {}))
+
+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()[0], sys.exc_info()[1], sys.exc_info()[2]))