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Ingy döt Net 2023-07-01 11:58:00 -04:00
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## Generic utilities
def enumerate(stream): foreach stream as $x (0; .+1; "\(.): \($x)");
def reverseString: explode | reverse | implode;
## UPC functions
def digitL: {
" ## #": 0,
" ## #": 1,
" # ##": 2,
" #### #": 3,
" # ##": 4,
" ## #": 5,
" # ####": 6,
" ### ##": 7,
" ## ###": 8,
" # ##": 9
};
def digitR: {
"### # ": 0,
"## ## ": 1,
"## ## ": 2,
"# # ": 3,
"# ### ": 4,
"# ### ": 5,
"# # ": 6,
"# # ": 7,
"# # ": 8,
"### # ": 9
};
def endSentinel: "# #"; # also at start
def midSentinel:" # # ";
def decodeUpc:
# Emit {rc: boolean, message: string}
def decodeUpcImpl:
# The "nil" result
def nil: { rc: false, message: ""};
(sub("^ *";"") | sub(" *$"; "")) as $upc
| if ($upc|length != 95) then nil
else [1, 3] as $oneThree
| { pos: 0,
digits: [],
sum: 0 }
| # end sentinel
if $upc[.pos: .pos+3] != endSentinel
then nil
else .pos += 3
# 6 left hand digits
| .i = 0
| until( .i == 6 or .i == null;
.i += 1
| digitL[$upc[.pos: .pos+7]] as $digit
| if ($digit|not) then .i = null
else .digits += [$digit]
| .sum += $digit * $oneThree[(.digits|length) % 2]
| .pos += 7
end )
| if .i == null then nil
else # mid sentinel
if $upc[.pos: .pos+5] != midSentinel
then nil
else .pos += 5
# 6 right hand digits
| .i = 0
| until( .i == 6 or .i == null;
.i += 1
| digitR[$upc[.pos: .pos+7]] as $digit
| if ($digit|not) then .i = null
else .digits += [$digit]
| .sum += $digit * $oneThree[(.digits|length) % 2]
| .pos += 7
end )
| if .i == null then nil
else # end sentinel
if ($upc[.pos : .pos+3] != endSentinel) then false
else if (.sum % 10 == 0)
then {rc: true, message: "\(.digits) "}
else {rc: false, message: "Failed Checksum "}
end
end
end
end
end
end
end ;
. as $in
| decodeUpcImpl
| .message
+ (if .rc then "Rightside Up"
else ($in | reverseString | decodeUpcImpl)
| .message
+ (if .rc then "Upside Down"
else "Invalid digit(s)"
end)
end);
## Examples
def barcodes: [
" # # # ## # ## # ## ### ## ### ## #### # # # ## ## # # ## ## ### # ## ## ### # # # ",
" # # # ## ## # #### # # ## # ## # ## # # # ### # ### ## ## ### # # ### ### # # # ",
" # # # # # ### # # # # # # # # # # ## # ## # ## # ## # # #### ### ## # # ",
" # # ## ## ## ## # # # # ### # ## ## # # # ## ## # ### ## ## # # #### ## # # # ",
" # # ### ## # ## ## ### ## # ## # # ## # # ### # ## ## # # ### # ## ## # # # ",
" # # # # ## ## # # # # ## ## # # # # # #### # ## # #### #### # # ## # #### # # ",
" # # # ## ## # # ## ## # ### ## ## # # # # # # # # ### # # ### # # # # # ",
" # # # # ## ## # # ## ## ### # # # # # ### ## ## ### ## ### ### ## # ## ### ## # # ",
" # # ### ## ## # # #### # ## # #### # #### # # # # # ### # # ### # # # ### # # # ",
" # # # #### ## # #### # # ## ## ### #### # # # # ### # ### ### # # ### # # # ### # # "
];
enumerate( barcodes[] | decodeUpc )