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openwrt: use a string buffer for json_encode

This commit is contained in:
Bart Van Der Meerssche 2010-05-22 11:01:15 +02:00
parent fdd5363cf7
commit af4edb53e6
1 changed files with 5 additions and 3 deletions
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8
openwrt/package/flukso/src/data.lua
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@ -88,12 +88,14 @@ end
function json_encode(M) function json_encode(M)
local J = {} local J = {}
for meter, T in pairs(M) do for meter, T in pairs(M) do
J[meter] = '['
local H = timestamps(T) local H = timestamps(T)
local SB = {'['} -- use a string buffer for building up the JSON string
for k, timestamp in ipairs(H) do for k, timestamp in ipairs(H) do
J[meter] = J[meter] .. '[' .. timestamp .. ',' .. T[timestamp] .. '],' SB[#SB+1] = '[' .. timestamp .. ',' .. T[timestamp] .. '],'
end end
J[meter] = string.sub(J[meter], 1, -2) .. ']' SB[#SB] = SB[#SB]:sub(1, -2) -- remove the trialing comma from the last entry
SB[#SB+1] = ']'
J[meter] = table.concat(SB)
end end
return J return J
end end