From ea81a8087bcd7953b083a2be9db447f75e7ebf56 Mon Sep 17 00:00:00 2001 From: Joel Martin Date: Wed, 2 Apr 2014 22:23:37 -0500 Subject: All: split types into types, env, printer, core. - types: low-level mapping to the implementation language. - core: functions on types that are exposed directly to mal. - printer: implementation called by pr-str, str, prn, println. - env: the environment implementation - Also, unindent all TCO while loops so that the diff of step4 and step5 are minimized. --- python/env.py | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 python/env.py (limited to 'python/env.py') diff --git a/python/env.py b/python/env.py new file mode 100644 index 0000000..4cd8e05 --- /dev/null +++ b/python/env.py @@ -0,0 +1,28 @@ +# 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] -- cgit v1.2.3