livescript/env.ls

   1 export class Env
   2     (outer = null, data = {}) ->
   3         @outer = outer
   4         @data = data
   5
   6     set: (symbol, ast) ->
   7         @data[symbol] = ast
   8
   9     find: (symbol) ->
  10         if symbol of @data then @
  11         else if @outer? then @outer.find symbol
  12
  13     get: (symbol) ->
  14         result = @try-get symbol
  15         if not result
  16         then throw new Error "symbol not found: #{symbol}"
  17         else result
  18
  19     try-get: (symbol) ->
  20         env = @find symbol
  21         if env then env.data[symbol]