Module:StripToNumbers

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Summary

Example: fetch first number:

"sdfsdf 23.56 sdfsdf 33" (using main) => 23.56

"text without number" (using mainnull, with fallback text) => No number found

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---

local p = {}

function p.main(frame)
	local theString = mw.text.unstrip(frame.args[1])
	local onlyNumber
	onlyNumber = (string.match(theString, "%-?[%d%.]+"))
	checkedNumber = tonumber(onlyNumber)
	if checkedNumber == nil then
		error(" Input did not contain valid numeric data")
	else
		return checkedNumber
	end
end

function p.halve(frame)
	local checkedNumber = (p.main(frame))
	local halvedNumber
	halvedNumber = (checkedNumber / 2)
	return halvedNumber
end

function p.mainnull(frame)
	local theString = mw.text.unstrip(frame.args[1])
	local fallback = frame.args[2]
	local onlyNumber
	onlyNumber = (string.match(theString, "%-?[%d%.]+"))
	checkedNumber = tonumber(onlyNumber)
	if checkedNumber == nil then
		if fallback == nil then
			return nil
		else
			return mw.text.unstrip(fallback)
		end
	else
		return checkedNumber
	end
end

return p