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# Environment
class Env():
def __init__(self, outer=None, binds=None, exprs=None):
self.data = {}
self.outer = outer or None
if binds:
for i in range(len(binds)):
if binds[i] == "&":
self.data[binds[i+1]] = exprs[i:]
break
else:
self.data[binds[i]] = exprs[i]
def find(self, key):
if key in self.data: return self
elif self.outer: return self.outer.find(key)
else: return None
def set(self, key, value):
self.data[key] = value
return value
def get(self, key):
env = self.find(key)
if not env: raise Exception("'" + key + "' not found")
return env.data[key]
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