65 lines
1.7 KiB
Lua
65 lines
1.7 KiB
Lua
local require = require
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local json = require "json"
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math.randomseed(os.time())
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-- read csv lines
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function ParseCSVLine(line,sep)
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local res = {}
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local pos = 1
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sep = sep or ','
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while true do
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local c = string.sub(line,pos,pos)
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if (c == "") then break end
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if (c == '"') then
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local txt = ""
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repeat
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local startp,endp = string.find(line,'^%b""',pos)
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txt = txt..string.sub(line,startp+1,endp-1)
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pos = endp + 1
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c = string.sub(line,pos,pos)
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if (c == '"') then txt = txt..'"' end
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until (c ~= '"')
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table.insert(res,txt)
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assert(c == sep or c == "")
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pos = pos + 1
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else
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local startp,endp = string.find(line,sep,pos)
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if (startp) then
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table.insert(res,string.sub(line,pos,startp-1))
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pos = endp + 1
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else
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table.insert(res,string.sub(line,pos))
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break
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end
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end
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end
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return res
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end
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loadFile = function()
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local filename = "zip_code_database.csv"
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local data = {}
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local count = 0
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local sep = ","
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for line in io.lines(filename) do
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local values = ParseCSVLine(line,sep)
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data[count + 1] = { zip=values[1], type=values[2], city=values[4], state=values[7], county=values[8], timezone=values[9] }
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count = count + 1
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end
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return data
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end
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generator = function()
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local data = loadFile()
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return coroutine.create(function()
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for k,v in pairs(data) do
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coroutine.yield(json.stringify(v))
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end
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end)
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end
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return generator() |