const DECIMAL_RESOLUTION_REGEX = /^(\d+)x(\d+)$/;
const ATTR_LIST_REGEX = /\s*(.+?)\s*=((?:\".*?\")|.*?)(?:,|$)/g;
// adapted from https://github.com/kanongil/node-m3u8parse/blob/master/attrlist.js
class AttrList {
constructor(attrs) {
if (typeof attrs === 'string') {
attrs = AttrList.parseAttrList(attrs);
}
for(var attr in attrs){
Eif(attrs.hasOwnProperty(attr)) {
this[attr] = attrs[attr];
}
}
}
decimalInteger(attrName) {
const intValue = parseInt(this[attrName], 10);
if (intValue > Number.MAX_SAFE_INTEGER) {
return Infinity;
}
return intValue;
}
hexadecimalInteger(attrName) {
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) {
const intValue = parseInt(this[attrName], 16);
if (intValue > Number.MAX_SAFE_INTEGER) {
return Infinity;
}
return intValue;
}
decimalFloatingPoint(attrName) {
return parseFloat(this[attrName]);
}
enumeratedString(attrName) {
return this[attrName];
}
decimalResolution(attrName) {
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) {
var match, attrs = {};
ATTR_LIST_REGEX.lastIndex = 0;
while ((match = ATTR_LIST_REGEX.exec(input)) !== null) {
var value = match[2], quote = '"';
if (value.indexOf(quote) === 0 &&
value.lastIndexOf(quote) === (value.length-1)) {
value = value.slice(1, -1);
}
attrs[match[1]] = value;
}
return attrs;
}
}
export default AttrList;
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