CODEWITHSUNDEEP
lua
Pwrcdr87
Pwrcdr87

Reputation: 965

Lua: Desired Results are Received Then Not Without Changing Code

Right now I'm trying to use Lua to receive variables from barcodes sent out from an outside source. When I run this, there is a variable rotation from the local function rot(input) that appears to be "buggy". If I run this code exactly as it is with the print statements below, the rotation will appear and disappear. Please help me understand why this may happen?

Please note: There are two aspects of this code that I'm currently working on. A) Code128 is not properly retrieving the variables. B)My code can definitely be shortened. But I'm new and learning as I go. The main purpose for this thread is to help me understand why code will sometimes display the desired result, then won't the next minute?

Thank you.

Edited: I've updated the code a bit to make it cleaner. Condensed all of my string.match statements into tables with other barcode related fields. Still learning and looking to make it even more cleaner. I love learning this, but am still having the same problem with my local function rot(input) and getting intermittent results. Any help is greatly appreciated!

local function rot(input)
rotTable = {["R"] = "cw", ["I"] = "180", ["B"] = "ccw"}
for k,v in pairs (rotTable) do
    if input == k then
        rotation = v
    else
        rotation = ""
    end
end
return rotation
end

local function barCode(input)

local bcID = string.match(input,"%^(B%w)")
    if bcID == "BY" then
        bcID = string.match(input,"%^BY.*%^(B%w)")
    end
local bcTable = {
    ["BC"] = {"code128", 10,  string.match(input,"%^BY.*%^BC(%u),(%d*),(%u),%u,%u%^FD(.*)%^FS")},
    ["B2"] = {"bc2of5i", 20, string.match(input,"%^B2(%u),(%d*),(%u),%u,%u%^FD(.*)%^FS")},
    ["BE"] = {"ean13", 10, string.match(input,"%^BE(%u),(%d*),(%u),%u%^FD(.*)%^FS")},
    ["B8"] = {"ean8", 10, string.match(input,"%^B8(%u),(%d*),(%u),%u%^FD(.*)%^FS")},
    ["B3"] = {"code39", 10, string.match(input,"%^B3(%u),%u,(%d*),(%u),%u%^FD(.*)%^FS")},
    ["BU"] = {"upc_a", -1, string.match(input,"%^BU(%u),(%d*),(%u),%u%,%u^FD(.*)%^FS")}
    }

for k,v in pairs (bcTable) do
    if bcID == k then
        bcFields = v
        bcType, qzone, bcR, bcH, bcHr, bcData = unpack(bcFields)
    end
end

hPos = 0
vPos = 0

bcOutput = '<'..bcType..' qzone=\"'..qzone..'\" hbb=\"0\" vbb=\"0\" bbwidth=\"1\" hpos=\"'..hPos..'\" vpos=\"'..vPos..'\" rotation = \"'..rot(bcR)..'\" bgcolor=\"0\" barcolor=\"255\" textcolor=\"255\" barwidth=\"1\" height=\"8\">'..bcData..'</'..bcType..'>'

return bcOutput

end

print(barCode("^BY3^BCN,102,N,N^FDCHF05000042^FS"))
print(barCode("^B2B,110,N,N,N^FD45681382^FS"))
print(barCode("^BUN,183,N,N,N^FD61414199999^FS"))
print(barCode("^B8I,146,N,N^FD212345645121^FS"))
print(barCode("^BEB,183,N,N^FD211234567891^FS"))

Upvotes: 1

Views: 66

Answers (1)

lhf
lhf

Reputation: 72312

I'm not sure what is wrong with your code, if anything, but rot can be written more simply as

local rotTable = {["R"] = "cw", ["I"] = "180", ["B"] = "ccw"}
local function rot(input)
   return rotTable[input] or ""
end

In general, you shouldn't need to search Lua tables. For instance, the loop for k,v in pairs (bcTable) do can be replace by indexing as in the code above.

Upvotes: 1

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