Contents

require "docile/version"
require "docile/fallback_context_proxy"

module Docile
  # Executes a block in the context of an object whose interface represents a DSL.
  #
  # Example of using an Array as a DSL:
  #   Docile.dsl_eval [] do
  #     push 1
  #     push 2
  #     pop
  #     push 3
  #   end
  #   #=> [1, 3]
  #
  # @param dsl [Object]  an object whose methods represent a DSL
  # @param block [Proc]  a block to execute in the DSL context
  # @return    [Object]  the dsl object, after execution of the block
  def dsl_eval(dsl, &block)
    block_context = eval("self", block.binding)
    proxy_context = FallbackContextProxy.new(dsl, block_context)
    begin
      block_context.instance_variables.each { |ivar| proxy_context.instance_variable_set(ivar, block_context.instance_variable_get(ivar)) }
      proxy_context.instance_eval(&block)
    ensure
      block_context.instance_variables.each { |ivar| block_context.instance_variable_set(ivar, proxy_context.instance_variable_get(ivar)) }
    end
    dsl
  end
  module_function :dsl_eval
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
docile-0.9.1	lib/docile.rb
docile-0.9.0	lib/docile.rb