Sha256: e3c14b6049e999c2958bd63c8c0124d245a42c2b07e06c66d218862707f07c14
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Size: 1.46 KB
Versions: 15
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Stored size: 1.46 KB
Contents
module AnswersEngine
module Plugin
module ContextExposer
def self.exposed_methods
raise NotImplementedError.new('Specify methods exposed to isolated env')
end
def exposed_methods
self.class.exposed_methods
end
# Create lambda to retrieve a variable or call instance method
def var_or_proc vars, key
myself = self # Avoid stack overflow
return lambda{vars[key]} if vars.has_key?(key)
lambda{|*args| myself.send(key, *args)}
end
def exposed_env vars
keys = exposed_methods + vars.keys
Hash[keys.uniq.map{|key|[key, var_or_proc(vars, key)]}]
end
def expose_to object, env
metaclass = class << object; self; end
env.each do |key, block|
metaclass.send(:define_method, key, block)
end
object
end
# Create isolated context object from self
def create_context vars = {}
create_top_object_script = '(
lambda do
object = Object.new
metaclass = class << object
define_method(:context_binding){binding}
end
object
end
).call'
object = TOPLEVEL_BINDING.eval(create_top_object_script)
env = exposed_env(vars)
expose_to object, env
object
end
# Create an isolated binding
def isolated_binding vars = {}
create_context(vars).context_binding
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems