Re: common prefix?
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- Subject: Re: common prefix?
- From: Michal Kolodziejczyk <miko@...>
- Date: 2009年7月17日 19:17:18 +0200
Michal Kolodziejczyk wrote:
> Petite Abeille wrote:
>> Hello,
>>
>> Does anyone has a little function to compute the common prefix of a list
>> of strings?
>>
>> E.g.:
>>
>> local aList = { 'foobarbaz', 'foobar', 'foo' }
>>
>> print( CommonPrefix( aList ) )
>>
>>> foo
>
> Here is my try:
...and yet another - you may like this one:
function CommonPrefix(...)
local anIterator=function(...)
local TStrings={...}
local numStrings=#TStrings
local aCharPointer=1
local aChar
return function()
aChar=TStrings[1]:sub(aCharPointer,aCharPointer)
for i=2,numStrings do
if aChar~=TStrings[i]:sub(aCharPointer,aCharPointer) then
return nil
end
end
aCharPointer=aCharPointer+1
return aChar
end
end
local aResult={}
for aChar in anIterator(...) do
aResult[#aResult+1]=aChar
end
return table.concat(aResult)
end
Regards,
miko