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const DECIMAL_RESOLUTION_REGEX = /^(\d+)x(\d+)$/;
const ATTR_LIST_REGEX = /(.+?)=(".*?"|.*?)(?:,|$)/g;
// adapted from https://github.com/kanongil/node-m3u8parse/blob/master/attrlist.js
export class AttrList {
[key: string]: any;
constructor(attrs: string | Record<string, any>) {
if (typeof attrs === 'string') {
attrs = AttrList.parseAttrList(attrs);
}
for (const attr in attrs) {
if (attrs.hasOwnProperty(attr)) {
if (attr.substring(0, 2) === 'X-') {
this.clientAttrs = this.clientAttrs || [];
this.clientAttrs.push(attr);
}
this[attr] = attrs[attr];
}
}
}
decimalInteger(attrName: string): number {
const intValue = parseInt(this[attrName], 10);
if (intValue > Number.MAX_SAFE_INTEGER) {
return Infinity;
}
return intValue;
}
hexadecimalInteger(attrName: string) {
if (this[attrName]) {
let stringValue = (this[attrName] || '0x').slice(2);
stringValue = (stringValue.length & 1 ? '0' : '') + stringValue;
const value = new Uint8Array(stringValue.length / 2);
for (let i = 0; i < stringValue.length / 2; i++) {
value[i] = parseInt(stringValue.slice(i * 2, i * 2 + 2), 16);
}
return value;
} else {
return null;
}
}
hexadecimalIntegerAsNumber(attrName: string): number {
const intValue = parseInt(this[attrName], 16);
if (intValue > Number.MAX_SAFE_INTEGER) {
return Infinity;
}
return intValue;
}
decimalFloatingPoint(attrName: string): number {
return parseFloat(this[attrName]);
}
optionalFloat(attrName: string, defaultValue: number): number {
const value = this[attrName];
return value ? parseFloat(value) : defaultValue;
}
enumeratedString(attrName: string): string | undefined {
return this[attrName];
}
bool(attrName: string): boolean {
return this[attrName] === 'YES';
}
decimalResolution(attrName: string):
| {
width: number;
height: number;
}
| undefined {
const res = DECIMAL_RESOLUTION_REGEX.exec(this[attrName]);
if (res === null) {
return undefined;
}
return {
width: parseInt(res[1], 10),
height: parseInt(res[2], 10),
};
}
static parseAttrList(input: string): Record<string, any> {
let match;
const attrs = {};
const quote = '"';
ATTR_LIST_REGEX.lastIndex = 0;
while ((match = ATTR_LIST_REGEX.exec(input)) !== null) {
let value = match[2];
if (
value.indexOf(quote) === 0 &&
value.lastIndexOf(quote) === value.length - 1
) {
value = value.slice(1, -1);
}
const name = match[1].trim();
attrs[name] = value;
}
return attrs;
}
}