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ea81a8087b
- 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.
29 lines
789 B
Python
29 lines
789 B
Python
# Environment
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class Env():
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def __init__(self, outer=None, binds=None, exprs=None):
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self.data = {}
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self.outer = outer or None
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if binds:
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for i in range(len(binds)):
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if binds[i] == "&":
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self.data[binds[i+1]] = exprs[i:]
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break
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else:
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self.data[binds[i]] = exprs[i]
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def find(self, key):
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if key in self.data: return self
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elif self.outer: return self.outer.find(key)
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else: return None
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def set(self, key, value):
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self.data[key] = value
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return value
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def get(self, key):
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env = self.find(key)
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if not env: raise Exception("'" + key + "' not found")
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return env.data[key]
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