33 lines
1.1 KiB
Ruby
33 lines
1.1 KiB
Ruby
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
|