CadNum

Author: Dmitry Ovsyanko

.github/workflows/main.yml

@@ -1,5 +1,11 @@
 name: unit tests
-on: push
+on:
+  push:
+    branches: 
+      - main
+  pull_request:
+    branches: 
+      - main
 jobs:
   build:
     runs-on: ubuntu-latest

__tests__/isCadNum.js

@@ -0,0 +1,45 @@
+const {isCadNum, randomCadNum} = require ('..')
+
+const RE = /^\d{2}:\d{2}:\d{6,7}:\d{1,}$/
+
+test ('basic', () => {
+
+	expect (() => isCadNum ()).toThrow ()
+	expect (() => isCadNum (123)).toThrow ()
+
+	expect (() => isCadNum ('47:14:120300:')).toThrow ()
+	expect (() => isCadNum ('47:14:12030:814')).toThrow ()
+	expect (() => isCadNum ('47:14:12030011:814')).toThrow ()
+
+	expect (() => isCadNum ('47-14-120300-814')).toThrow ()
+		
+	expect (() => isCadNum ('47!14:120300:814')).toThrow ()
+	expect (() => isCadNum ('47:14-1203001:814')).toThrow ()
+
+	expect (() => isCadNum ('47:14:12030O:814')).toThrow ()
+	expect (() => isCadNum ('47:14:1203001:81A')).toThrow ()
+
+	expect (isCadNum ('47:14:120300:814')).toBeUndefined ()
+	expect (isCadNum ('47:14:1203001:814')).toBeUndefined ()
+
+	for (const pre of [undefined, '', '47', '47:', '47:14', '47:14', '47:14:120300', '47:14:1203001', '47:14:120300:', '47:14:1203001:']) {
+
+		for (const length of [undefined, 14, 18]) {
+
+			for (let i = 0; i < 10; i ++) {
+
+				const v = randomCadNum (pre || length ? {pre, length} : undefined)
+
+				expect (v).toMatch (RE)
+				if (pre && length > pre.length + 2) {
+					expect (v).toMatch (pre)
+					expect (v).toHaveLength (length)
+				}				
+				
+			}
+
+		}
+
+	}
+
+})

index.js

@@ -4,6 +4,7 @@ const {INN_10, INN_12_2, INN_12_1} = require ('./lib/INN')
 const SNILS = require ('./lib/SNILS')
 const BankAcct = require ('./lib/BankAcct')
 const BankCard = require ('./lib/BankCard')
+const CadNum = require ('./lib/CadNum'), cadNum = new CadNum ()
 const {OKPO_8, OKPO_10} = require ('./lib/OKPO')
 class KPP extends Check {constructor () {super (9)}}
 
@@ -42,4 +43,7 @@ module.exports = {
 	isBankCard     : str        => new BankCard ().verify (str),
 	randomBankCard : opt        => new BankCard ().random (opt),
 
+	isCadNum       : str        => cadNum.verify (str),
+	randomCadNum   : opt        => cadNum.random (opt),
+
 }

lib/CadNum.js

@@ -0,0 +1,94 @@
+const CH_COLON = ':'.charCodeAt (0)
+const CH_0     = '0'.charCodeAt (0)
+const CH_9     = '9'.charCodeAt (0)
+
+module.exports = class {
+
+	raise (s, o) {
+
+		const err = Error (s)
+
+		for (const k in o) err [k] = o [k]
+		
+		throw err
+	
+	}	
+
+	verify (str) {
+
+		const type = typeof str; if (type !== 'string') this.raise (`CadNum must be of type string`, {str, type})
+		
+		const {length} = str; if (length < 14) this.raise (`CadNum must be at least 14 charaters long`, {str, length})
+			
+		const lastColonIndex = str.lastIndexOf (':')
+
+		switch (lastColonIndex) {
+
+			case -1:
+				this.raise (`Invalid CadNum "${str}": colon not found`, {str, lastColonIndex})
+
+			case 12:
+			case 13:
+				break
+
+			default:
+				this.raise (`Invalid CadNum "${str}": the last colon found at position ${lastColonIndex}`, {str, lastColonIndex})
+
+		}
+
+		for (let index = 0; index < length; index ++) if (index !== lastColonIndex) {
+			
+			const c = str.charCodeAt (index)
+
+			switch (index) {
+
+				case 2:
+				case 5:
+					if (c !== CH_COLON) this.raise (`Invalid CadNum "${str}": not a colon at position ${index}`, {str, index})
+					break
+
+				default:
+					if (c < CH_0 || c > CH_9) this.raise (`Invalid CadNum "${str}": not a digit at position ${index}`, {str, index})
+
+			}
+
+		}
+	
+	}
+
+	random (options = {}) {
+
+		let {pre, length} = options
+
+		if (!pre) pre = ''
+
+		if (pre.length === 12 || pre.length === 13) if (pre.charCodeAt (pre.length - 1) !== CH_COLON) pre += ':'
+
+		if (!length) length = 14 + Math.floor (5 * Math.random ())
+
+		if (length <= pre.length) length = pre.length + 1
+
+		const b = Buffer.alloc (length)
+
+		for (let i = 0; i < pre.length; i ++) b [i] = pre.charCodeAt (i)
+
+		for (let i = pre.length; i < length; i ++) b [i] = 48 + Math.floor (10 * Math.random ())
+
+		b [2] = CH_COLON
+		b [5] = CH_COLON
+
+		if (b.lastIndexOf (CH_COLON) < 12) {
+
+			let lastColonIndex = 12
+
+			if (length > 14 && Math.random () > 0.5) lastColonIndex ++
+			
+			b [lastColonIndex] = CH_COLON
+
+		}
+
+		return b.toString ()
+
+	}
+	
+}