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68 lignes
1.5 KiB
68 lignes
1.5 KiB
require "./types"
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require "./error"
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module Mal
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class Env
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property data
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def initialize(@outer)
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@data = {} of String => Mal::Type
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end
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def initialize(@outer, binds, exprs : Array(Mal::Type))
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@data = {} of String => Mal::Type
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eval_error "binds must be list or vector" unless binds.is_a? Array
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# Note:
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# Array#zip() can't be used because overload resolution failed
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(0...binds.size).each do |idx|
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sym = binds[idx].unwrap
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eval_error "bind name must be symbol" unless sym.is_a? Mal::Symbol
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if sym.str == "&"
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eval_error "missing variable parameter name" if binds.size == idx
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next_param = binds[idx+1].unwrap
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eval_error "bind name must be symbol" unless next_param.is_a? Mal::Symbol
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var_args = Mal::List.new
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exprs[idx..-1].each{|e| var_args << e} if idx < exprs.size
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@data[next_param.str] = Mal::Type.new var_args
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break
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end
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@data[sym.str] = exprs[idx]
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end
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end
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def dump
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puts "ENV BEGIN".colorize.red
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@data.each do |k, v|
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puts " #{k} -> #{print(v)}".colorize.red
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end
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puts "ENV END".colorize.red
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end
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def set(key, value)
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@data[key] = value
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end
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def find(key)
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return self if @data.has_key? key
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o = @outer
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if o
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o.find key
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else
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nil
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end
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end
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def get(key)
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e = find key
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eval_error "'#{key}' not found" unless e
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e.data[key]
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end
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end
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end
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