I need help creating a macro that makes Julia evaluate my floating point expressions as BigFloat

I need a macro that takes any expression matching r"-?[0-9]+\Q.\E[0-9]+", and encloses it in a BigFloat constructor. For example, a macro that receives the source code below:

@my_macro function f()
	sum = 0.0
	x = 902.4
	y = -47.1
	for i in 1:20
		sum += x^2 + 4.3*y
	end
	return sum
end

and returns the following:

function f()
	sum = BigFloat("0.0")
	x = BigFloat("902.4")
	y = BigFloat("-47.1")
	for i in 1:20
		sum += x^2 + BigFloat("4.3")*y
	end
	return sum
end

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