vgridjs/dist/geohash.cjs.map

Vgrid DGGS JS

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* Geohash implementation in TypeScript\r\n * Original Python implementation by Hiroaki Kawai <kawai@iij.ad.jp>\r\n */\r\n\r\nconst _base32 = '0123456789bcdefghjkmnpqrstuvwxyz';\r\nconst _base32Map: { [key: string]: number } = {};\r\nfor (let i = 0; i < _base32.length; i++) {\r\n    _base32Map[_base32[i]] = i;\r\n}\r\n\r\ninterface BBox {\r\n    s: number;\r\n    w: number;\r\n    n: number;\r\n    e: number;\r\n}\r\n\r\ninterface DecodeResult {\r\n    latitude: number;\r\n    longitude: number;\r\n    latitudeDelta?: number;\r\n    longitudeDelta?: number;\r\n}\r\n\r\nfunction _floatHexToInt(f: number): [number, number] | null {\r\n    if (f < -1.0 || f >= 1.0) {\r\n        return null;\r\n    }\r\n\r\n    if (f === 0.0) {\r\n        return [1, 1];\r\n    }\r\n\r\n    const h = f.toString(16);\r\n    const x = h.indexOf(\"0x1.\");\r\n    if (x < 0) return null;\r\n    const p = h.indexOf(\"p\");\r\n    if (p <= 0) return null;\r\n\r\n    const halfLen = h.slice(x + 4, p).length * 4 - parseInt(h.slice(p + 1));\r\n    let r: number;\r\n    if (x === 0) {\r\n        r = (1 << halfLen) + ((1 << (h.slice(x + 4, p).length * 4)) + parseInt(h.slice(x + 4, p), 16));\r\n    } else {\r\n        r = (1 << halfLen) - ((1 << (h.slice(x + 4, p).length * 4)) + parseInt(h.slice(x + 4, p), 16));\r\n    }\r\n\r\n    return [r, halfLen + 1];\r\n}\r\n\r\nfunction _intToFloatHex(i: number, l: number): number {\r\n    if (l === 0) {\r\n        return -1.0;\r\n    }\r\n\r\n    const half = 1 << (l - 1);\r\n    const s = Math.floor((l + 3) / 4);\r\n    if (i >= half) {\r\n        i = i - half;\r\n        return parseFloat(`0x0.${(i << (s * 4 - l)).toString(16).padStart(s, '0')}p1`);\r\n    } else {\r\n        i = half - i;\r\n        return parseFloat(`-0x0.${(i << (s * 4 - l)).toString(16).padStart(s, '0')}p1`);\r\n    }\r\n}\r\n\r\nfunction _encodeI2c(lat: number, lon: number, latLength: number, lonLength: number): string {\r\n    const precision = Math.floor((latLength + lonLength) / 5);\r\n    let a: number, b: number;\r\n    if (latLength < lonLength) {\r\n        a = lon;\r\n        b = lat;\r\n    } else {\r\n        a = lat;\r\n        b = lon;\r\n    }\r\n\r\n    const boost = [0, 1, 4, 5, 16, 17, 20, 21];\r\n    let ret = '';\r\n    for (let i = 0; i < precision; i++) {\r\n        ret += _base32[(boost[a & 7] + (boost[b & 3] << 1)) & 0x1F];\r\n        const t = a >> 3;\r\n        a = b >> 2;\r\n        b = t;\r\n    }\r\n\r\n    return ret.split('').reverse().join('');\r\n}\r\n\r\nexport function encode(latitude: number, longitude: number, precision: number = 12): string {\r\n    if (latitude >= 90.0 || latitude < -90.0) {\r\n        throw new Error(\"Invalid latitude.\");\r\n    }\r\n    while (longitude < -180.0) {\r\n        longitude += 360.0;\r\n    }\r\n    while (longitude >= 180.0) {\r\n        longitude -= 360.0;\r\n    }\r\n\r\n    const xprecision = precision + 1;\r\n    let latLength = Math.floor(xprecision * 5 / 2);\r\n    let lonLength = latLength;\r\n    if (xprecision % 2 === 1) {\r\n        lonLength += 1;\r\n    }\r\n\r\n    const a = _floatHexToInt(latitude / 90.0);\r\n    const o = _floatHexToInt(longitude / 180.0);\r\n    if (!a || !o) {\r\n        throw new Error(\"Invalid coordinates\");\r\n    }\r\n\r\n    let ai: number, oi: number;\r\n    if (a[1] > latLength) {\r\n        ai = a[0] >> (a[1] - latLength);\r\n    } else {\r\n        ai = a[0] << (latLength - a[1]);\r\n    }\r\n\r\n    if (o[1] > lonLength) {\r\n        oi = o[0] >> (o[1] - lonLength);\r\n    } else {\r\n        oi = o[0] << (lonLength - o[1]);\r\n    }\r\n\r\n    return _encodeI2c(ai, oi, latLength, lonLength).slice(0, precision);\r\n}\r\n\r\nfunction _decodeC2i(hashcode: string): [number, number, number, number] {\r\n    let lon = 0;\r\n    let lat = 0;\r\n    let bitLength = 0;\r\n    let latLength = 0;\r\n    let lonLength = 0;\r\n\r\n    for (const i of hashcode) {\r\n        const t = _base32Map[i];\r\n        if (bitLength % 2 === 0) {\r\n            lon = lon << 3;\r\n            lat = lat << 2;\r\n            lon += (t >> 2) & 4;\r\n            lat += (t >> 2) & 2;\r\n            lon += (t >> 1) & 2;\r\n            lat += (t >> 1) & 1;\r\n            lon += t & 1;\r\n            lonLength += 3;\r\n            latLength += 2;\r\n        } else {\r\n            lon = lon << 2;\r\n            lat = lat << 3;\r\n            lat += (t >> 2) & 4;\r\n            lon += (t >> 2) & 2;\r\n            lat += (t >> 1) & 2;\r\n            lon += (t >> 1) & 1;\r\n            lat += t & 1;\r\n            lonLength += 2;\r\n            latLength += 3;\r\n        }\r\n        bitLength += 5;\r\n    }\r\n\r\n    return [lat, lon, latLength, lonLength];\r\n}\r\n\r\nexport function decode(hashcode: string, delta: boolean = false): DecodeResult {\r\n    const [lat, lon, latLength, lonLength] = _decodeC2i(hashcode);\r\n\r\n    const latitudeDelta = 90.0 / (1 << latLength);\r\n    const longitudeDelta = 180.0 / (1 << lonLength);\r\n    const latitude = _intToFloatHex(lat, latLength) * 90.0 + latitudeDelta;\r\n    const longitude = _intToFloatHex(lon, lonLength) * 180.0 + longitudeDelta;\r\n\r\n    if (delta) {\r\n        return { latitude, longitude, latitudeDelta, longitudeDelta };\r\n    }\r\n    return { latitude, longitude };\r\n}\r\n\r\nexport function decodeExactly(hashcode: string): DecodeResult {\r\n    return decode(hashcode, true);\r\n}\r\n\r\nexport function bbox(hashcode: string): BBox {\r\n    const [lat, lon, latLength, lonLength] = _decodeC2i(hashcode);\r\n    const latitudeDelta = 180.0 / (1 << latLength);\r\n    const longitudeDelta = 360.0 / (1 << lonLength);\r\n    const latitude = _intToFloatHex(lat, latLength) * 90.0;\r\n    const longitude = _intToFloatHex(lon, lonLength) * 180.0;\r\n\r\n    return {\r\n        s: latitude,\r\n        w: longitude,\r\n        n: latitude + latitudeDelta,\r\n        e: longitude + longitudeDelta\r\n    };\r\n}\r\n\r\nexport function neighbors(hashcode: string): string[] {\r\n    const [lat, lon, latLength, lonLength] = _decodeC2i(hashcode);\r\n    const ret: string[] = [];\r\n    let tlat = lat;\r\n\r\n    for (const tlon of [lon - 1, lon + 1]) {\r\n        const code = _encodeI2c(tlat, tlon, latLength, lonLength);\r\n        if (code) {\r\n            ret.push(code);\r\n        }\r\n    }\r\n\r\n    tlat = lat + 1;\r\n    if (!(tlat >> latLength)) {\r\n        for (const tlon of [lon - 1, lon, lon + 1]) {\r\n            ret.push(_encodeI2c(tlat, tlon, latLength, lonLength));\r\n        }\r\n    }\r\n\r\n    tlat = lat - 1;\r\n    if (tlat >= 0) {\r\n        for (const tlon of [lon - 1, lon, lon + 1]) {\r\n            ret.push(_encodeI2c(tlat, tlon, latLength, lonLength));\r\n        }\r\n    }\r\n\r\n    return ret;\r\n}\r\n\r\nexport function expand(hashcode: string): string[] {\r\n    const ret = neighbors(hashcode);\r\n    ret.push(hashcode);\r\n    return ret;\r\n}\r\n\r\n// Vgrid specific functions\r\nexport function geohashParent(geohashId: string): string {\r\n    if (!geohashId || geohashId.length <= 1) {\r\n        throw new Error(\"Cannot get parent of an empty or single-character geohash.\");\r\n    }\r\n    return geohashId.slice(0, -1);\r\n}\r\n\r\nexport function geohashChildren(geohashId: string, resolution: number): string[] {\r\n    if (geohashId.length >= resolution) {\r\n        return geohashId.length === resolution ? [geohashId] : [];\r\n    }\r\n\r\n    let children = [geohashId];\r\n    while (children[0].length < resolution) {\r\n        children = children.flatMap(c => _base32.split('').map(ch => c + ch));\r\n    }\r\n    return children;\r\n}\r\n"]}