https://navpro.truckerpath.com/assets/here-flexible-polyline-CkLVKbma.js

1var DECODING_TABLE = [
2	62,
3	-1,
4	-1,
5	52,
6	53,
7	54,
8	55,
9	56,
10	57,
11	58,
12	59,
13	60,
14	61,
15	-1,
16	-1,
17	-1,
18	-1,
19	-1,
20	-1,
21	-1,
22	0,
23	1,
24	2,
25	3,
26	4,
27	5,
28	6,
29	7,
30	8,
31	9,
32	10,
33	11,
34	12,
35	13,
36	14,
37	15,
38	16,
39	17,
40	18,
41	19,
42	20,
43	21,
44	22,
45	23,
46	24,
47	25,
48	-1,
49	-1,
50	-1,
51	-1,
52	63,
53	-1,
54	26,
55	27,
56	28,
57	29,
58	30,
59	31,
60	32,
61	33,
62	34,
63	35,
64	36,
65	37,
66	38,
67	39,
68	40,
69	41,
70	42,
71	43,
72	44,
73	45,
74	46,
75	47,
76	48,
77	49,
78	50,
79	51
80];
81var FORMAT_VERSION = 1;
82var decodeChar = (char) => {
83	const charCode = char.charCodeAt(0);
84	const idx = DECODING_TABLE[charCode - 45];
85	if (idx === -1) throw new Error("Invalid flexible polyline character.");
86	return idx;
87};
88var decodeUnsignedValues = (encoded) => {
89	let result = 0;
90	let shift = 0;
91	const resList = [];
92	for (let i = 0; i < encoded.length; i++) {
93		const value = decodeChar(encoded[i]);
94		result |= (value & 31) << shift;
95		if ((value & 32) === 0) {
96			resList.push(result);
97			result = 0;
98			shift = 0;
99		} else shift += 5;
100	}
101	if (shift > 0) throw new Error("Invalid encoding");
102	return resList;
103};
104var decodeHeader = (version, encodedHeader) => {
105	if (version !== FORMAT_VERSION) throw new Error("Invalid format version");
106	const precision = encodedHeader & 15;
107	const thirdDim = encodedHeader >> 4 & 7;
108	const thirdDimPrecision = encodedHeader >> 7 & 15;
109	return {
110		precision,
111		thirdDim,
112		thirdDimPrecision
113	};
114};
115var toSigned = (val) => {
116	let res = val;
117	if (res & 1) res = ~res;
118	res >>= 1;
119	return res;
120};
121const decode = (encoded) => {
122	if (!encoded || typeof encoded !== "string") throw new Error("Encoded polyline must be a non-empty string.");
123	const decoder = decodeUnsignedValues(encoded);
124	if (decoder.length < 2) throw new Error("Invalid encoding. Missing header");
125	const header = decodeHeader(decoder[0], decoder[1]);
126	const factorDegree = Math.pow(10, header.precision);
127	const factorZ = Math.pow(10, header.thirdDimPrecision);
128	const { thirdDim } = header;
129	let lastLat = 0;
130	let lastLng = 0;
131	let lastZ = 0;
132	const res = [];
133	let i = 2;
134	for (; i < decoder.length;) {
135		const deltaLat = toSigned(decoder[i]) / factorDegree;
136		const deltaLng = toSigned(decoder[i + 1]) / factorDegree;
137		lastLat += deltaLat;
138		lastLng += deltaLng;
139		if (thirdDim) {
140			if (i + 2 >= decoder.length) throw new Error("Invalid encoding. Premature ending reached");
141			const deltaZ = toSigned(decoder[i + 2]) / factorZ;
142			lastZ += deltaZ;
143			res.push([
144				lastLat,
145				lastLng,
146				lastZ
147			]);
148			i += 3;
149		} else {
150			res.push([lastLat, lastLng]);
151			i += 2;
152		}
153	}
154	if (i !== decoder.length) throw new Error("Invalid encoding. Premature ending reached");
155	return {
156		...header,
157		polyline: res
158	};
159};
160export { decode as t };