--- esI.py-	2016-09-06 23:00:00.000000000 +0900
+++ esI.py	2016-09-07 00:00:00.000000000 +0900
@@ -281,6 +281,41 @@ def es_split(s):
 
 	return lst
 
+def do_expr(expr, info):
+	(k, v) = expr[:2]
+	if k == 'kwd' and v == 'return':
+		r = do_expr( expr[2], info )
+		info.get('call_stk')[-1]['ret'] = r
+		return r
+	return 123 # !!!
+
+def do_blk(blk, info):
+	(_, _, lst) = blk  # [ 'br_s', '{', lst ]
+	call_inf = info.get('call_stk')[-1]
+	for expr in lst:
+		do_expr(expr, info)
+		if 'ret' in call_inf:
+			return call_inf.get('ret')
+
+def do_fcall(name, args, info):
+	lst = info.get('lst')
+
+	f = lambda (k, nm): k == 'fdef' and nm == name
+	fdef = next( ( e for e in lst if f( e[:2] ) ), None )
+	if fdef is None:
+		err_exit("not found fdef '{}'".format(name))
+
+	(args_info, ret_type, body) = fdef[2:]
+
+	names = [ e[1] for e in args_info if e[0] == 'name' ]
+	env = dict( zip(names, args) )
+	
+	call_stk = info.get('call_stk')
+	call_stk.append( { 'name' : name, 'env' : env } )
+	do_blk(body, info)
+	call_inf = call_stk.pop()
+	return call_inf.get('ret', None)
+
 def err_exit(msg, rcode=1):
 	print('Err {}'.format(msg))
 	sys.exit(rcode)
@@ -294,5 +329,10 @@ if __name__ == "__main__":
 			s = f.read()
 		lst = es_split(s)
 		print yaml.dump(lst)
+
+		argv = sys.argv[1:]
+		args = [ len(argv), argv ]
+		info = { 'lst' : lst, 'call_stk' : [] }
+		rcode = do_fcall( 'main', args, info )
 	sys.exit(rcode)
 # EOF