def action_exp(toks):
tok = toks[0]
if isinstance(tok, env.exp): return tok
if len(tok) == 2:
op = tok[0]
r = tok[1]
if isinstance(r, list): r = action_exp(r)
return env.oper(op, r)
elif len(tok) == 3:
op = tok[1]
l = tok[0]
r = tok[2]
if isinstance(l, list): l = action_exp(l)
if isinstance(r, list): r = action_exp(r)
return env.oper(op, l, r)
else:
return tok
def action_exp(toks):
tok = toks[0]
if isinstance(tok,env.exp): return tok
if len(tok)==2:
op=tok[0]
r=tok[1]
if isinstance(r,list): r=action_exp(r)
return env.oper(op,r)
elif len(tok)==3:
op=tok[1]
l=tok[0]
r=tok[2]
if isinstance(l,list): l=action_exp(l)
if isinstance(r,list): r=action_exp(r)
return env.oper(op,l,r)
else:
return tok