support instance variables from block context in multi-level dsl
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@ -15,12 +15,12 @@ module Docile
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#
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# @param dsl [Object] an object whose methods represent a DSL
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# @param block [Proc] a block to execute in the DSL context
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# @return [Object] the given DSL object
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# @return [Object] the dsl object, after execution of the block
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def dsl_eval(dsl, &block)
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block_context = eval("self", block.binding)
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proxy_context = FallbackContextProxy.new(dsl, block_context)
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block_context.instance_variables.each { |ivar| proxy_context.instance_variable_set(ivar, block_context.instance_variable_get(ivar)) }
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begin
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block_context.instance_variables.each { |ivar| proxy_context.instance_variable_set(ivar, block_context.instance_variable_get(ivar)) }
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proxy_context.instance_eval(&block)
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ensure
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block_context.instance_variables.each { |ivar| block_context.instance_variable_set(ivar, proxy_context.instance_variable_get(ivar)) }
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@ -2,12 +2,14 @@ require 'set'
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module Docile
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class FallbackContextProxy
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BASIC_METHODS = Set[:==, :equal?, :"!", :"!=",
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:instance_eval, :instance_variable_get, :instance_variable_set,
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:object_id, :__send__, :__id__]
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NON_PROXIED_METHODS = Set[:object_id, :__send__, :__id__, :==, :equal?, :"!", :"!=", :instance_eval,
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:instance_variables, :instance_variable_get, :instance_variable_set,
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:remove_instance_variable]
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NON_PROXIED_INSTANCE_VARIABLES = Set[:@__receiver__, :@__fallback__]
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instance_methods.each do |method|
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unless BASIC_METHODS.include?(method.to_sym)
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unless NON_PROXIED_METHODS.include?(method.to_sym)
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undef_method(method)
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end
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end
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@ -26,6 +28,11 @@ module Docile
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__proxy_method__(:sub, *args, &block)
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end
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# Special case to allow proxy instance variables
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def instance_variables
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super - NON_PROXIED_INSTANCE_VARIABLES.to_a
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end
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def method_missing(method, *args, &block)
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__proxy_method__(method, *args, &block)
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end
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@ -76,11 +76,17 @@ describe Docile do
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@iv1 = 'iv1'; outer { @iv1.should == 'iv1' }
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end
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#it "should find instance variable from block definition in inner dsl scope" do
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# @iv2 = 'iv2'; outer { inner {
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# @iv2.should == 'iv2'
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# } }
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#end
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it "should write instance variable assigned in block into outer dsl scope" do
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@iv1 = 'foo'; outer { @iv1 = 'bar' }; @iv1.should == 'bar'
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end
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it "should find instance variable from block definition in inner dsl scope" do
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@iv2 = 'iv2'; outer { inner { @iv2.should == 'iv2' } }
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end
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it "should find instance variable from block definition in inner dsl scope" do
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@iv2 = 'foo'; outer { inner { @iv2 = 'bar' } }; @iv2.should == 'bar'
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end
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end
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end
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