Sha256: 3ee44b60760a03830fa9a46222af9cb38ea8094d4064ee3b4362a24ff965299a
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Versions: 123
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Stored size: 1.29 KB
Contents
#!/usr/bin/env ruby
require 'tins'
LetScope = Tins::BlankSlate.with :instance_eval, :to_s, :inspect, :extend
class LetScope
include Tins::MethodMissingDelegator::DelegatorModule
include Tins::BlockSelf
def initialize(my_self, bindings = {}, outer_scope = nil)
super(my_self)
@outer_scope = outer_scope
@bindings = bindings
extend Tins::Eigenclass
eigenclass_eval { extend Tins::Constant }
each_binding do |name, value|
eigenclass_eval { constant name, value }
end
end
def each_binding(&block)
if @outer_scope
@outer_scope.each_binding(&block)
end
@bindings.each(&block)
end
def let(bindings = {}, &block)
ls = LetScope.new(block_self(&block), bindings, self)
ls.instance_eval(&block)
end
# Including this module into your current namespace defines the let method.
module Include
include Tins::BlockSelf
def let(bindings = {}, &block)
ls = LetScope.new(block_self(&block), bindings)
ls.instance_eval(&block)
end
end
end
if $0 == __FILE__
class Foo
include LetScope::Include
def twice(x)
2 * x
end
def test
let x: 1, y: twice(1) do
let z: twice(x) do
puts "#{x} * #{y} == #{z} # => #{x * y == twice(x)}"
end
end
end
end
Foo.new.test
end
Version data entries
123 entries across 109 versions & 8 rubygems