9 lines
232 B
CoffeeScript
9 lines
232 B
CoffeeScript
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{nilp, car, cdr} = require './lists'
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module.exports = lookup = (scopes, name) ->
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throw new Error "Unknown variable '#{name}'" if nilp scopes
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scope = car scopes
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return scope[name] if scope[name]?
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lookup((cdr scopes), name)
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