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#!/usr/bin/env -S nim r -d:release --verbosity:0 --hints:off
import std/[strutils, tables]
const
Weights = [8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2]
TranslitTable = {
'A':1, 'B':2, 'C':3, 'D':4, 'E':5, 'F':6, 'G':7, 'H':8,
'J':1, 'K':2, 'L':3, 'M':4, 'N':5, 'P':7, 'R':9,
'S':2, 'T':3, 'U':4, 'V':5, 'W':6, 'X':7, 'Y':8, 'Z':9,
}.toTable()
proc isValidVIN(input: string): bool =
if input.len != 17: return false
var values: array[17, int]
for i, c in input:
if i == 8: continue # skip check digit
if c in Letters:
values[i] = TranslitTable[c]
elif c in Digits:
values[i] = c.ord - '0'.ord
else:
return false
var productSum: int
for i, v in values:
productSum += v * Weights[i]
let checkDigit = block:
let tmp = productSum mod 11
if tmp == 10: 'X'
else: chr('0'.ord + tmp)
checkDigit == input[8]
when isMainModule:
import std/unittest
const
Test = ["5GZCZ43D13S812715", "1M8GDM9ASKP042788"]
Expected = [true, false]
suite "Vehicle Identification Numbers":
test "valid number":
check isValidVIN(Test[0]) == Expected[0]
test "invalid number":
check isValidVIN(Test[1]) == Expected[1]
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