Ole-Morten Duesund
e8428de775
Vite + TypeScript PWA that mirrors the Android app's core features: - Pre-processed shelter data (build-time UTM33N→WGS84 conversion) - Leaflet map with shelter markers, user location, and offline tiles - Canvas compass arrow (ported from DirectionArrowView.kt) - IndexedDB shelter cache with 7-day staleness check - Service worker with CacheFirst tiles and precached app shell - i18n for en, nb, nn (ported from Android strings.xml) - iOS/Android compass handling with low-pass filter - Respects user map interaction (no auto-snap on pan/zoom) - Build revision cache-breaker for reliable SW updates Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
'use strict';
|
|
|
|
var $SyntaxError = require('es-errors/syntax');
|
|
var $TypeError = require('es-errors/type');
|
|
|
|
var substring = require('./substring');
|
|
|
|
var isInteger = require('math-intrinsics/isInteger');
|
|
var isNaN = require('math-intrinsics/isNaN');
|
|
|
|
// https://262.ecma-international.org/14.0/#sec-parsehexoctet
|
|
|
|
module.exports = function ParseHexOctet(string, position) {
|
|
if (typeof string !== 'string') {
|
|
throw new $TypeError('Assertion failed: `string` must be a String');
|
|
}
|
|
if (!isInteger(position) || position < 0) {
|
|
throw new $TypeError('Assertion failed: `position` must be a nonnegative integer');
|
|
}
|
|
|
|
var len = string.length; // step 1
|
|
if ((position + 2) > len) { // step 2
|
|
var error = new $SyntaxError('requested a position on a string that does not contain 2 characters at that position'); // step 2.a
|
|
return [error]; // step 2.b
|
|
}
|
|
var hexDigits = substring(string, position, position + 2); // step 3
|
|
|
|
var n = +('0x' + hexDigits);
|
|
if (isNaN(n)) {
|
|
return [new $SyntaxError('Invalid hexadecimal characters')];
|
|
}
|
|
return n;
|
|
|
|
/*
|
|
4. Let _parseResult_ be ParseText(StringToCodePoints(_hexDigits_), |HexDigits[~Sep]|).
|
|
5. If _parseResult_ is not a Parse Node, return _parseResult_.
|
|
6. Let _n_ be the unsigned 8-bit value corresponding with the MV of _parseResult_.
|
|
7. Return _n_.
|
|
*/
|
|
};
|