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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/UPC/Ruby/upc.rb Normal file
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DIGIT_F = {
" ## #" => 0,
" ## #" => 1,
" # ##" => 2,
" #### #" => 3,
" # ##" => 4,
" ## #" => 5,
" # ####" => 6,
" ### ##" => 7,
" ## ###" => 8,
" # ##" => 9,
}
DIGIT_R = {
"### # " => 0,
"## ## " => 1,
"## ## " => 2,
"# # " => 3,
"# ### " => 4,
"# ### " => 5,
"# # " => 6,
"# # " => 7,
"# # " => 8,
"### # " => 9,
}
END_SENTINEL = "# #"
MID_SENTINEL = " # # "
def decode_upc(s)
def decode_upc_impl(input)
upc = input.strip
if upc.length != 95 then
return false
end
pos = 0
digits = []
sum = 0
# end sentinel
if upc[pos .. pos + 2] == END_SENTINEL then
pos += 3
else
return false
end
# 6 left hand digits
for i in 0 .. 5
digit = DIGIT_F[upc[pos .. pos + 6]]
if digit == nil then
return false
else
digits.push(digit)
sum += digit * [1, 3][digits.length % 2]
pos += 7
end
end
# mid sentinel
if upc[pos .. pos + 4] == MID_SENTINEL then
pos += 5
else
return false
end
# 6 right hand digits
for i in 0 .. 5
digit = DIGIT_R[upc[pos .. pos + 6]]
if digit == nil then
return false
else
digits.push(digit)
sum += digit * [1, 3][digits.length % 2]
pos += 7
end
end
# end sentinel
if upc[pos .. pos + 2] == END_SENTINEL then
pos += 3
else
return false
end
if sum % 10 == 0 then
print digits, " "
return true
else
print "Failed Checksum "
return false
end
end
if decode_upc_impl(s) then
puts "Rightside Up"
elsif decode_upc_impl(s.reverse) then
puts "Upside Down"
else
puts "Invalid digit(s)"
end
end
def main
num = 0
print "%2d: " % [num += 1]
decode_upc(" # # # ## # ## # ## ### ## ### ## #### # # # ## ## # # ## ## ### # ## ## ### # # # ")
print "%2d: " % [num += 1]
decode_upc(" # # # ## ## # #### # # ## # ## # ## # # # ### # ### ## ## ### # # ### ### # # # ")
print "%2d: " % [num += 1]
decode_upc(" # # # # # ### # # # # # # # # # # ## # ## # ## # ## # # #### ### ## # # ")
print "%2d: " % [num += 1]
decode_upc(" # # ## ## ## ## # # # # ### # ## ## # # # ## ## # ### ## ## # # #### ## # # # ")
print "%2d: " % [num += 1]
decode_upc(" # # ### ## # ## ## ### ## # ## # # ## # # ### # ## ## # # ### # ## ## # # # ")
print "%2d: " % [num += 1]
decode_upc(" # # # # ## ## # # # # ## ## # # # # # #### # ## # #### #### # # ## # #### # # ")
print "%2d: " % [num += 1]
decode_upc(" # # # ## ## # # ## ## # ### ## ## # # # # # # # # ### # # ### # # # # # ")
print "%2d: " % [num += 1]
decode_upc(" # # # # ## ## # # ## ## ### # # # # # ### ## ## ### ## ### ### ## # ## ### ## # # ")
print "%2d: " % [num += 1]
decode_upc(" # # ### ## ## # # #### # ## # #### # #### # # # # # ### # # ### # # # ### # # # ")
print "%2d: " % [num += 1]
decode_upc(" # # # #### ## # #### # # ## ## ### #### # # # # ### # ### ### # # ### # # # ### # # ")
end
main()