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module Docile
# @api private
#
# A namespace for functions relating to the execution of a block against a
# proxy object.
module Execution
# Execute a block in the context of an object whose methods represent the
# commands in a DSL, using a specific proxy class.
#
# @param dsl [Object] context object whose methods make up the
# (initial) DSL
# @param proxy_type [FallbackContextProxy, ChainingFallbackContextProxy]
# which class to instantiate as proxy context
# @param args [Array] arguments to be passed to the block
# @param block [Proc] the block of DSL commands to be executed
# @return [Object] the return value of the block
def exec_in_proxy_context(dsl, proxy_type, *args, &block)
block_context = eval('self', block.binding)
proxy_context = proxy_type.new(dsl, block_context)
begin
block_context.instance_variables.each do |ivar|
value_from_block = block_context.instance_variable_get(ivar)
proxy_context.instance_variable_set(ivar, value_from_block)
end
proxy_context.instance_exec(*args, &block)
ensure
block_context.instance_variables.each do |ivar|
value_from_dsl_proxy = proxy_context.instance_variable_get(ivar)
block_context.instance_variable_set(ivar, value_from_dsl_proxy)
end
end
end
module_function :exec_in_proxy_context
end
end
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