47 lines
853 B
Ruby
47 lines
853 B
Ruby
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class Functional
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include Enumerable
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def self.method_missing meth, *args, &exe
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self.new.send meth, *args, &exe
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end
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def push_method code, *args, &exe
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name = "__meth_#{exe.object_id}"
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define_singleton_method name, &exe
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@stack.push [code % name]+args
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self
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end
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def initialize obj = nil, func = nil, *args
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@stack, @obj, @func, @args = [], obj, func, args
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end
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def collect &exe
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push_method "value=%s(value)", &exe
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end
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# map/reduce?
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def map &exe
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raise "Reserved for MapReduce."
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end
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# map/reduce?
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def reduce &exe
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raise "Reserved for MapReduce."
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end
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def select &exe
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push_method "%s(value)||next", &exe
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end
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def delete_if &exe
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push_method "%s(value)&&next", &exe
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end
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def each &exe
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return self unless exe
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@obj.send @func || :each, *@args, &eval( "lambda{|value|#{@stack.join( ";")};exe.call(value)}")
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end
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end
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