mirror of
https://github.com/ms-ati/docile
synced 2023-03-27 23:21:52 -04:00
32 lines
1.1 KiB
Ruby
32 lines
1.1 KiB
Ruby
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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# Example of using an Array as a DSL:
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#
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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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# push 3
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# end
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# #=> [1, 3]
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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 dsl object, after execution of the block
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def dsl_eval(dsl, *args, &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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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_exec(*args,&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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end
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dsl
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end
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module_function :dsl_eval
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end
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