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* Copyright (c) Siemens 2016 - 2025
* SPDX-License-Identifier: MIT
*/
/** */
export interface Section {
value: string;
current?: boolean;
/** Indicate this is a network mask. */
mask?: boolean;
}
export interface Ip4SplitOptions {
type?: 'insert' | 'delete' | 'paste';
input?: string | null;
pos?: number;
cidr?: boolean;
}
export interface Ip6SplitOptions {
type?: 'insert' | 'delete' | 'paste';
input?: string | null;
pos?: number;
zeroCompression?: boolean;
cidr?: boolean;
}
const isDigit = (c: string): boolean => c >= '0' && c <= '9';
const isHex = (c: string): boolean => (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F');
/**
* Parse IPv4 input string into IPv4 address section array.
*/
export const splitIpV4Sections = (options: Ip4SplitOptions): Section[] => {
const { input, pos, cidr } = options;
const sections: Section[] = [{ value: '' }];
Iif (!input) {
return sections;
}
let maxDots = 3;
for (let i = 0; i < input.length; i++) {
const c = input.charAt(i);
if (isDigit(c)) {
sections.at(-1)!.value += c;
} else if (c === '.' && maxDots > 0) {
maxDots--;
sections.push({ value: c }, { value: '' });
} else Iif (cidr && c === '/') {
sections.push({ value: c }, { value: '', mask: true });
}
if (pos === i) {
sections.at(-1)!.current = true;
}
}
// Trim empty sections for example the user entered ..
let previousDivider = false;
for (let i = 0; i < sections.length; i += 2) {
const isDivider = sections.at(i)?.value === '' && sections.at(i + 1)?.value === '.';
Iif (previousDivider && isDivider) {
sections.splice(i, 2);
}
previousDivider = isDivider;
}
// Split values > 255 in multiple sections:
// - 256 will be split into 25 and 6
// - 255255255 will be split into 255, 255 and 255
for (let i = 0; i < sections.length; i++) {
const { value, current } = sections[i];
if (value.length >= 3 && parseInt(value, 10) > 255) {
const append: Section[] = [];
let n = '';
for (const c of value) {
if (parseInt(n + c, 10) > 255) {
append.push({ value: n }, { value: '.' });
n = c;
} else {
n += c;
}
}
if (n.length > 0) {
append.push({ value: n });
}
sections.splice(i, 1, ...append);
if (current) {
sections[i + append.length - 1].current = true;
}
}
}
// Split leading zero sections:
// Assume a string starting by 0 e.g. 012 will be split into 0 and 12
for (let i = 0; i < sections.length; i++) {
const sec = sections[i];
if (sec.value.length > 1 && sec.value.startsWith('0')) {
sections.splice(i, 1, { value: '0' }, { value: sec.value.substring(1) });
}
}
// Ensure the that the CIDR divider is a slash
Iif (cidr) {
const startCidr = 7;
Iif (startCidr < sections.length && sections[startCidr].value === '.') {
sections[startCidr].value = '/';
}
const prefixPos = startCidr + 1;
Iif (prefixPos < sections.length) {
const prefixLength = sections[prefixPos].value;
Iif (parseInt(prefixLength, 10) > 32) {
sections[prefixPos].value = prefixLength.substring(0, 2);
}
}
}
return sections;
};
export const splitIpV6Sections = (options: Ip6SplitOptions): Section[] => {
const { type, input, pos, zeroCompression, cidr } = options;
const sections: Section[] = [{ value: '' }];
Iif (!input) {
return sections;
}
for (let i = 0; i < input.length; i++) {
const c = input.charAt(i).toUpperCase();
if (isHex(c)) {
sections.at(-1)!.value += c;
} else if (c === ':') {
if (input.charAt(i - 1) === c) {
// Merge :: characters
sections.at(-2)!.value += c;
} else {
sections.push({ value: c }, { value: '' });
}
} else if (cidr && c === '/') {
sections.push({ value: c }, { value: '', mask: true });
}
if (pos === i) {
sections.at(-1)!.current = true;
}
}
// Split values > FFFF in multiple sections:
// - 1FFFF will be split into 1FFF and F
for (let i = 0; i < sections.length; i++) {
const { value, current } = sections[i];
if (value.length > 4) {
const append: Section[] = [];
for (let p = 0; p < value.length; p += 4) {
const part = value.substring(p, p + 4);
append.push({ value: part });
if (part.length === 4) {
append.push({ value: ':' });
}
}
sections.splice(i, 1, ...append);
if (current) {
sections[i + append.length - 1].current = true;
}
}
}
// Drop invalid zero compression indicators '::'
const removeEnd = pos === input.length - 1 || type === 'paste';
let matches = sections.filter(s => s.value.startsWith('::'));
if (matches) {
matches = removeEnd ? matches : matches.reverse();
if (zeroCompression) {
matches.shift();
}
// Only allow one occurrence of ::
for (const drop of matches) {
drop.value = drop.value.substring(1);
}
}
// Ensure the that the CIDR divider is a slash
if (cidr) {
const startCidr = matches.length > 0 ? 13 : 15;
if (startCidr < sections.length && sections[startCidr].value === ':') {
sections[startCidr].value = '/';
}
const prefixPos = startCidr + 1;
if (prefixPos < sections.length) {
const prefixLength = sections[prefixPos].value;
if (parseInt(prefixLength, 10) > 128) {
sections[prefixPos].value = prefixLength.substring(0, 2);
}
}
}
return sections;
};
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