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direct check of regex lookbehind capability

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Matt Walsh
2025-09-11 08:47:16 -05:00
parent f17f69f60e
commit 14b1891efd
2 changed files with 21 additions and 17 deletions
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33
server/scripts/modules/utils/metar.mjs
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@@ -5,21 +5,22 @@ import en from '../../vendor/auto/locale/en.js';
// metar-taf-parser requires regex lookbehind
// this does not work in iOS < 16.4
// this is a detection algorithm for iOS versions
const isIos = /iP(ad|od|hone)/i.test(window.navigator.userAgent);
let iosVersionOk = false;
if (isIos) {
// regex match the version string
const iosVersionRaw = /OS (\d+)_(\d+)/.exec(window.navigator.userAgent);
// check for match
if (iosVersionRaw) {
// break into parts
const iosVersionMajor = parseInt(iosVersionRaw[1], 10);
const iosVersionMinor = parseInt(iosVersionRaw[2], 10);
if (iosVersionMajor > 16) iosVersionOk = true;
if (iosVersionMajor === 16 && iosVersionMinor >= 4) iosVersionOk = true;
// this is a detection algorithm for missing lookbehind support
const supportsRegexLookAheadLookBehindCheck = () => {
try {
return (
// deliberately using RegExp for broader browser support during check
/* eslint-disable prefer-regex-literals */
'hibyehihi'
.replace(new RegExp('(?<=hi)hi', 'g'), 'hello')
.replace(new RegExp('hi(?!bye)', 'g'), 'hey') === 'hibyeheyhello'
/* eslint-enable prefer-regex-literals */
);
} catch {
return false;
}
}
};
const supportsRegexLookAheadLookBehind = supportsRegexLookAheadLookBehindCheck();
/**
* Augment observation data by parsing METAR when API fields are missing
@@ -27,8 +28,8 @@ if (isIos) {
* @returns {Object} - Augmented observation with parsed METAR data filled in
*/
const augmentObservationWithMetar = (observation) => {
// check for a metar message and for unusable ios versions
if (!observation?.rawMessage || (isIos && !iosVersionOk)) {
// check for a metar message and for regex lookbehind support
if (!observation?.rawMessage || (!supportsRegexLookAheadLookBehind)) {
return observation;
}