support local variable and method fallback contexts
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2a6452b432
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@ -1,9 +1,11 @@
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require "docile/version"
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require "docile/fallback_context_proxy"
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module Docile
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# Executes a block in the context of an object whose interface represents a DSL.
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#
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# Docile.dsl_eval([]) do
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# Example of using an Array as a DSL:
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# Docile.dsl_eval [] do
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# push 1
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# push 2
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# pop
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@ -16,7 +18,7 @@ module Docile
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# @return [Object] the given DSL object
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def dsl_eval(dsl, &block)
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block_context = eval("self", block.binding)
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dsl.instance_eval(&block)
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FallbackContextProxy.new(dsl, block_context).instance_eval(&block)
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dsl
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end
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module_function :dsl_eval
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@ -0,0 +1,43 @@
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require 'set'
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module Docile
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class FallbackContextProxy
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BASIC_METHODS = Set[:==, :equal?, :"!", :"!=", :instance_eval, :object_id, :__send__, :__id__]
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instance_methods.each do |method|
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unless BASIC_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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def initialize(receiver, fallback)
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@__receiver__ = receiver
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@__fallback__ = fallback
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end
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def id
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@__receiver__.__send__(:id)
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end
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# Special case due to `Kernel#sub`'s existence
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def sub(*args, &block)
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__proxy_method__(:sub, *args, &block)
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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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def __proxy_method__(method, *args, &block)
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begin
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@__receiver__.__send__(method.to_sym, *args, &block)
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rescue ::NoMethodError => e
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begin
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@__fallback__.__send__(method.to_sym, *args, &block)
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rescue ::NoMethodError
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raise(e)
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end
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end
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end
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end
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end
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@ -30,8 +30,7 @@ describe Docile do
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end.should == [1, 3]
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end
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context "methods"
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context "methods" do
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it "should find method of outer dsl in outer dsl scope" do
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outer { a.should == 'a' }
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end
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@ -40,36 +39,44 @@ describe Docile do
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outer { inner { b.should == 'b' } }
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end
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#it "should find method of outer dsl in inner dsl scope" do
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# outer { inner { a.should == 'a' } }
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#end
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#
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#it "should find method of block's context in outer dsl scope" do
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# def c; 'c'; end
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# outer { c.should == 'c' }
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#end
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#
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#it "should find method of block's context in inner dsl scope" do
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# def c; 'c'; end
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# outer { inner { c.should == 'c' } }
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#end
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it "should find method of outer dsl in inner dsl scope" do
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outer { inner { a.should == 'a' } }
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end
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# it "should find local variable from block context in outer dsl scope" do
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# foo = 'foo'
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# outer { foo.should == 'foo' }
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# end
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#
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#
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#
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# it "should find local variable from block definition in inner dsl scope" do
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# bar = 'bar'
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# outer { inner { bar.should == 'bar' } }
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# end
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#
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it "should find method of block's context in outer dsl scope" do
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def c; 'c'; end
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outer { c.should == 'c' }
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end
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it "should find method of block's context in inner dsl scope" do
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def c; 'c'; end
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outer { inner { c.should == 'c' } }
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end
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it "should find method of outer dsl in preference to block context" do
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def a; 'not a'; end
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outer { a.should == 'a' }
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end
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end
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context "local variables" do
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it "should find local variable from block context in outer dsl scope" do
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foo = 'foo'
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outer { foo.should == 'foo' }
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end
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it "should find local variable from block definition in inner dsl scope" do
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bar = 'bar'
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outer { inner { bar.should == 'bar' } }
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end
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end
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context "instance variables" do
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#it "should find instance variable from block definition in inner dsl scope" do
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# @iv1 = 'iv1'; outer { inner { @iv1.should == 'iv1' } }
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#end
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#end
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end
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end
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end
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