Simple quoteed string parser written in lua

QuotedStringParser.lua

local quotes = {
	['\''] = true,
	['\"'] = true
}
local function parseString(line)
	local function skipWhiteSpace(index)
		return string.find(line, '%S', index)
	end 

	local function findNextSpace(index)
		return string.find(line, '%s', index)
	end

	local function findClosingQuote(index, type)
		return string.find(line, type, index)
	end 
	
	local parts = {}

	local index = 1
	while index ~= nil do 
		index = skipWhiteSpace(index)
		if not index then break end 

		local cur = string.sub(line, index, index)
		if quotes[cur] then
			local closer = findClosingQuote(index + 1, cur)
			local quotedString = string.sub(line, index + 1, closer and closer - 1 or nil)
			table.insert(parts, quotedString)
			if not closer then break end 
			index = closer
		else
			local nextSpace = findNextSpace(index)
			local word = string.sub(line, index, nextSpace and nextSpace - 1 or nil)
			table.insert(parts, word)
			if not nextSpace then break end 
			index = nextSpace
		end 
	end
	
	return parts 
end

for k,v in pairs(parseString("hello world 'this is a test'")) do 
	print(v)
end