Re: string patterns
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- Subject: Re: string patterns
- From: Andreas Stenius <andreas@...>
- Date: 2007年1月11日 13:08:35 +0100
And as a follow-up on the lpeg hint, here's my toss at it:
space = lpeg.S " \t"
sp = space^0
eq = lpeg.P "="
name = lpeg.C((1 - (space + eq))^1, "name")
sval = lpeg.C((1 - space)^1, "value")
q = lpeg.P "'"
qq = lpeg.P '"'
qval = q* lpeg.C((1 - q)^0, "value")* q
qqval = qq* lpeg.C((1 - qq)^0, "value")* qq
pair = lpeg.T(sp* name* sp* eq* sp* (qval + qqval + sval))
args = lpeg.T(pair^0)
function extract_args(s)
m = lpeg.match(s, args)
if m then
print("Matches:", m)
for k, v in pairs(m) do
print(k, v)
if type(v) == "table" then
for n, s in pairs(v) do
print("", n, s)
end
end
end
else
print("No match")
end
end
extract_args[[class=q href="http://images.goo gle.se/imghp?hl=sv&tab=wi"
onClick='return qs(this);' test=foo]]
Matches: table: 0x552050
1 table: 0x5520a0
name class
value q
2 table: 0x5521a0
name href
value http://images.goo gle.se/imghp?hl=sv&tab=wi
3 table: 0x552250
name onClick
value return qs(this);
4 table: 0x552380
name test
value foo
It's alot more verbose, but I like the power that comes with it :)
Andreas Stenius skrev:
Luiz Henrique de Figueiredo skrev:
No, not alternates like that, simply to be able to:
foo:gsub("(.-)[%s$]", bar)
Then try foo:gsub("(.-)%s?$", bar).
Yes, but this will make the capture greedy.. what saved me was that when
I read the source in lstrlib.c I found the frontiers: %f[...] which
saved me by simply appending a space at the end of my subject.
What made this more problematic was that I wanted to match
[[name=value name2='other val' name3="no, should I match this as well!"]]
where the value MIGHT be enclosed in single OR double quotes, and with
quotes, there may be spaces between the quotes too ;o).
So my pattern I successfully use now isn't pretty:
-- snippet is part of a bigger function
local function parseargs()
local t = {}
;(args .. " "):gsub("(%w+)%s*=%s*([\"']?)(.-)%2%f[%s]",
function( k, _, v )
t[k:lower()] = v
return ""
end)
return t
end
--
Med vänlig hälsning,
Andreas Stenius
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E-post: andreas@boxcom.se
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