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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/UPC/D/upc.d Normal file
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import std.algorithm : countUntil, each, map;
import std.array : array;
import std.conv : to;
import std.range : empty, retro;
import std.stdio : writeln;
import std.string : strip;
import std.typecons : tuple;
immutable LEFT_DIGITS = [
" ## #",
" ## #",
" # ##",
" #### #",
" # ##",
" ## #",
" # ####",
" ### ##",
" ## ###",
" # ##"
];
immutable RIGHT_DIGITS = LEFT_DIGITS.map!`a.map!"a == '#' ? ' ' : '#'".array`.array;
immutable END_SENTINEL = "# #";
immutable MID_SENTINEL = " # # ";
void decodeUPC(string input) {
auto decode(string candidate) {
int[] output;
size_t pos = 0;
auto next = pos + END_SENTINEL.length;
auto part = candidate[pos .. next];
if (part == END_SENTINEL) {
pos = next;
} else {
return tuple(false, cast(int[])[]);
}
foreach (_; 0..6) {
next = pos + 7;
part = candidate[pos .. next];
auto i = countUntil(LEFT_DIGITS, part);
if (i >= 0) {
output ~= i;
pos = next;
} else {
return tuple(false, cast(int[])[]);
}
}
next = pos + MID_SENTINEL.length;
part = candidate[pos .. next];
if (part == MID_SENTINEL) {
pos = next;
} else {
return tuple(false, cast(int[])[]);
}
foreach (_; 0..6) {
next = pos + 7;
part = candidate[pos .. next];
auto i = countUntil(RIGHT_DIGITS, part);
if (i >= 0) {
output ~= i;
pos = next;
} else {
return tuple(false, cast(int[])[]);
}
}
next = pos + END_SENTINEL.length;
part = candidate[pos .. next];
if (part == END_SENTINEL) {
pos = next;
} else {
return tuple(false, cast(int[])[]);
}
int sum = 0;
foreach (i,v; output) {
if (i % 2 == 0) {
sum += 3 * v;
} else {
sum += v;
}
}
return tuple(sum % 10 == 0, output);
}
auto candidate = input.strip;
auto output = decode(candidate);
if (output[0]) {
writeln(output[1]);
} else {
output = decode(candidate.retro.array.to!string);
if (output[0]) {
writeln(output[1], " Upside down");
} else if (output[1].empty) {
writeln("Invalid digit(s)");
} else {
writeln("Invalid checksum", output);
}
}
}
void main() {
auto barcodes = [
" # # # ## # ## # ## ### ## ### ## #### # # # ## ## # # ## ## ### # ## ## ### # # # ",
" # # # ## ## # #### # # ## # ## # ## # # # ### # ### ## ## ### # # ### ### # # # ",
" # # # # # ### # # # # # # # # # # ## # ## # ## # ## # # #### ### ## # # ",
" # # ## ## ## ## # # # # ### # ## ## # # # ## ## # ### ## ## # # #### ## # # # ",
" # # ### ## # ## ## ### ## # ## # # ## # # ### # ## ## # # ### # ## ## # # # ",
" # # # # ## ## # # # # ## ## # # # # # #### # ## # #### #### # # ## # #### # # ",
" # # # ## ## # # ## ## # ### ## ## # # # # # # # # ### # # ### # # # # # ",
" # # # # ## ## # # ## ## ### # # # # # ### ## ## ### ## ### ### ## # ## ### ## # # ",
" # # ### ## ## # # #### # ## # #### # #### # # # # # ### # # ### # # # ### # # # ",
" # # # #### ## # #### # # ## ## ### #### # # # # ### # ### ### # # ### # # # ### # # ",
];
barcodes.each!decodeUPC;
}