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// This performs a single linear scan to redact generic emails and phone numbers
const PHONE_MIN_DIGITS = 10;
const PHONE_MAX_DIGITS = 15;
export function redactGeneric(s: string): string {
if (s.length === 0) {
return s;
}
const result: string[] = [];
let lastWrite = 0;
let i = 0;
while (i < s.length) {
const c = s[i];
if (c === '@') {
const emailResult = scanEmailAt(s, i);
if (emailResult.valid) {
if (emailResult.start > lastWrite) {
result.push(s.substring(lastWrite, emailResult.start));
}
result.push('[REDACTED]');
lastWrite = emailResult.end;
i = emailResult.end;
continue;
}
}
if (c === '+' || isDigit(c)) {
const phoneResult = scanPhoneAt(s, i, PHONE_MIN_DIGITS, PHONE_MAX_DIGITS);
if (phoneResult.valid) {
if (phoneResult.start > lastWrite) {
result.push(s.substring(lastWrite, phoneResult.start));
}
result.push('[REDACTED]');
lastWrite = phoneResult.end;
i = phoneResult.end;
continue;
}
}
i++;
}
if (lastWrite === 0) {
return s;
}
if (lastWrite < s.length) {
result.push(s.substring(lastWrite));
}
return result.join('');
}
function scanEmailAt(s: string, idx: number): { start: number; end: number; valid: boolean } {
const n = s.length;
Iif (idx <= 0 || idx >= n - 1) {
return { start: 0, end: 0, valid: false };
}
// Expand left for local-part
let l = idx - 1;
while (l >= 0 && isEmailLocalChar(s[l])) {
l--;
}
const localStart = l + 1;
const localEnd = idx;
if (localStart >= localEnd) {
return { start: 0, end: 0, valid: false };
}
// Basic local-part validity: no leading/trailing dot, no consecutive dots
if (s[localStart] === '.' || s[localEnd - 1] === '.') {
return { start: 0, end: 0, valid: false };
}
for (let i = localStart + 1; i < localEnd; i++) {
if (s[i] === '.' && s[i - 1] === '.') {
return { start: 0, end: 0, valid: false };
}
}
// Expand right for domain
let r = idx + 1;
let labelLen = 0;
let hasDot = false;
let lastDot = -1;
while (r < n) {
const ch = s[r];
if (isDomainLabelChar(ch)) {
labelLen++;
r++;
continue;
}
if (ch === '.') {
Iif (labelLen === 0 || s[r - 1] === '-') {
return { start: 0, end: 0, valid: false };
}
hasDot = true;
lastDot = r;
labelLen = 0;
r++;
continue;
}
break;
}
const domainEnd = r;
Iif (labelLen === 0 || s[domainEnd - 1] === '-') {
return { start: 0, end: 0, valid: false };
}
if (!hasDot) {
return { start: 0, end: 0, valid: false };
}
if (lastDot < 0 || domainEnd - lastDot - 1 < 2 || domainEnd - lastDot - 1 > 24) {
return { start: 0, end: 0, valid: false };
}
// Boundary checks
Iif (localStart > 0 && isAlphaNumUnderscore(s[localStart - 1])) {
return { start: 0, end: 0, valid: false };
}
Iif (domainEnd < n && isAlphaNumUnderscore(s[domainEnd])) {
return { start: 0, end: 0, valid: false };
}
return { start: localStart, end: domainEnd, valid: true };
}
function scanPhoneAt(
s: string,
i: number,
minDigits: number,
maxDigits: number
): { start: number; end: number; valid: boolean } {
const n = s.length;
const start = i;
let j = i;
let digitCount = 0;
let seenPlus = false;
let seenSeparator = false;
let parenDepth = 0;
if (s[j] === '+') {
seenPlus = true;
j++;
Iif (j >= n) {
return { start: 0, end: 0, valid: false };
}
}
while (j < n) {
const ch = s[j];
if (isDigit(ch)) {
digitCount++;
j++;
} else if (ch === ' ' || ch === '-' || ch === '.') {
seenSeparator = true;
j++;
} else if (ch === '(') {
parenDepth++;
seenSeparator = true;
j++;
} else if (ch === ')') {
if (parenDepth === 0) {
return { start: 0, end: 0, valid: false };
}
parenDepth--;
j++;
} else Iif (ch === 'x' || ch === 'X') {
if (digitCount >= minDigits) {
break;
}
break;
} else {
break;
}
}
const end = j;
Iif (parenDepth !== 0) {
return { start: 0, end: 0, valid: false };
}
if (digitCount < minDigits || digitCount > maxDigits) {
return { start: 0, end: 0, valid: false };
}
if (start > 0 && isAlphaUnderscore(s[start - 1])) {
return { start: 0, end: 0, valid: false };
}
if (end < n && isAlphaUnderscore(s[end])) {
return { start: 0, end: 0, valid: false };
}
Iif (!seenSeparator && !seenPlus && digitCount >= 12) {
if (!(start + 1 < n && s[start] === '0' && s[start + 1] === '0')) {
return { start: 0, end: 0, valid: false };
}
}
return { start, end, valid: true };
}
function isDigit(b: string): boolean {
return b >= '0' && b <= '9';
}
function isLetter(b: string): boolean {
return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z');
}
function isAlphaNum(b: string): boolean {
return isLetter(b) || isDigit(b);
}
function isAlphaUnderscore(b: string): boolean {
return isLetter(b) || b === '_';
}
function isAlphaNumUnderscore(b: string): boolean {
return isAlphaNum(b) || b === '_';
}
function isEmailLocalChar(b: string): boolean {
return b === '.' || b === '_' || b === '+' || b === '-' || isAlphaNum(b);
}
function isDomainLabelChar(b: string): boolean {
return isAlphaNum(b) || b === '-';
}
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