Re: Modified allwords() function
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- Subject: Re: Modified allwords() function
- From: Wim Couwenberg <w.couwenberg@...>
- Date: 2005年5月16日 20:04:35 +0200
This is a perfect example for a coroutine iterator (see chapter 9.3):
The version below looks more contrived but is >10% faster on my system
(in lua 5.0.2)
local function allmatches(pattern)
local lines, linestate, line
local words, wordstate
return function(_, word)
if word then
word = words(wordstate, word)
else
lines, linestate, line = io.lines()
end
while not word do
line = lines(linestate, line)
if not line then break end
words, wordstate, word = string.gfind(line, pattern)
word = words(wordstate, word)
end
return word
end
end
Maybe the linestate/wordstate variables are redundant (didn't check) but
it would be cheating to leave them out (and make an assumption on the
implementation of io.lines and string.gfind).
--
Wim