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# File 'lib/ext/object.rb', line 136
def when(val=:noval)
iam = self
return val == self ? self : Forwarder.new do |name, *args, &block|
iam.define_singleton_method(:else) { |*vars| self }
iam
end if val != :noval
Forwarder.new do |name, *args, &block|
if (iam.respond_to?(name) || iam.methods.include?(name)) && (got = iam.__send__(name, *args, &block))
thn = Forwarder.new do |name, *inargs, &block|
if name.sym == :then
if block
ret = iam.instance_exec(*inargs, &block)
ret.define_singleton_method(:else) { |*vars| self }
ret
elsif inargs.mt?
thn
else
ret = inargs.sequester!
ret.define_singleton_method(:else) { |*vars| self }
ret
end
else
ret = __send__(name, *inargs, &block)
ret.define_singleton_method(:else) { |*vars, &blk|
if vars.mt? && block._?
Forwarder.new { ret }
else
ret
end
}
ret
end
end
else
ret = Forwarder.new do |name, *args, &block|
if name.sym == :then
els = Forwarder.new do |name, *targs, &block|
if name.sym == :else
if block
iam.instance_exec(*targs, &block)
elsif targs.mt?
Forwarder.new { |name, *eargs, &block| __send__(name, *eargs, &block) }
else
targs.sequester!
end
else
els
end
end
else
iam
end
end
end
end
end
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