mirrors/PMTiles
1
0
Fork 0
mirror of https://github.com/protomaps/PMTiles.git synced 2026-02-04 10:51:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

code style cleanup

Browse Source
This commit is contained in:
Brandon Liu
2022-02-18 10:44:20 +08:00
parent 313ce5b037
commit 47f03b768e
1 changed files with 55 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

107
js/pmtiles.ts
View File

@@ -1,4 +1,4 @@
declare var L: any;
declare const L: any;
export const shift = (n: number, shift: number) => {
return n * Math.pow(2, shift);
@@ -57,9 +57,9 @@ const compare = (
i: number
) => {
if (tz != view.getUint8(i)) return tz - view.getUint8(i);
var x = getUint24(view, i + 1);
const x = getUint24(view, i + 1);
if (tx != x) return tx - x;
var y = getUint24(view, i + 4);
const y = getUint24(view, i + 4);
if (ty != y) return ty - y;
return 0;
};
@@ -70,7 +70,7 @@ export const queryLeafdir = (
x: number,
y: number
): Entry | null => {
let offset_len = queryView(view, z | 0x80, x, y);
const offset_len = queryView(view, z | 0x80, x, y);
if (offset_len) {
return {
z: z,
@@ -85,7 +85,7 @@ export const queryLeafdir = (
};
export const queryTile = (view: DataView, z: number, x: number, y: number) => {
let offset_len = queryView(view, z, x, y);
const offset_len = queryView(view, z, x, y);
if (offset_len) {
return {
z: z,
@@ -105,11 +105,11 @@ const queryView = (
x: number,
y: number
): [number, number] | null => {
var m = 0;
var n = view.byteLength / 17 - 1;
let m = 0;
let n = view.byteLength / 17 - 1;
while (m <= n) {
var k = (n + m) >> 1;
var cmp = compare(z, x, y, view, k * 17);
const k = (n + m) >> 1;
const cmp = compare(z, x, y, view, k * 17);
if (cmp > 0) {
m = k + 1;
} else if (cmp < 0) {
@@ -123,8 +123,8 @@ const queryView = (
export const queryLeafLevel = (view: DataView): number | null => {
if (view.byteLength < 17) return null;
let numEntries = view.byteLength / 17;
let entry = parseEntry(view, numEntries - 1);
const numEntries = view.byteLength / 17;
const entry = parseEntry(view, numEntries - 1);
if (entry.is_dir) return entry.z;
return null;
};
@@ -146,8 +146,8 @@ const entrySort = (a: Entry, b: Entry): number => {
};
export const parseEntry = (dataview: DataView, i: number): Entry => {
var z_raw = dataview.getUint8(i * 17);
var z = z_raw & 127;
const z_raw = dataview.getUint8(i * 17);
const z = z_raw & 127;
return {
z: z,
x: getUint24(dataview, i * 17 + 1),
@@ -159,8 +159,8 @@ export const parseEntry = (dataview: DataView, i: number): Entry => {
};
export const sortDir = (dataview: DataView): ArrayBuffer => {
let entries: Entry[] = [];
for (var i = 0; i < dataview.byteLength / 17; i++) {
const entries: Entry[] = [];
for (let i = 0; i < dataview.byteLength / 17; i++) {
entries.push(parseEntry(dataview, i));
}
return createDirectory(entries);
@@ -169,11 +169,11 @@ export const sortDir = (dataview: DataView): ArrayBuffer => {
export const createDirectory = (entries: Entry[]): ArrayBuffer => {
entries.sort(entrySort);
let buffer = new ArrayBuffer(17 * entries.length);
let arr = new Uint8Array(buffer);
for (var i = 0; i < entries.length; i++) {
var entry = entries[i];
var z = entry.z;
const buffer = new ArrayBuffer(17 * entries.length);
const arr = new Uint8Array(buffer);
for (let i = 0; i < entries.length; i++) {
const entry = entries[i];
let z = entry.z;
if (entry.is_dir) z = z | 0x80;
arr[i * 17] = z;
@@ -203,22 +203,22 @@ export const createDirectory = (entries: Entry[]): ArrayBuffer => {
export const deriveLeaf = (root: Root, tile: Zxy): Zxy | null => {
const leaf_level = queryLeafLevel(root.dir);
if (leaf_level) {
let level_diff = tile.z - leaf_level;
let leaf_x = Math.trunc(tile.x / (1 << level_diff));
let leaf_y = Math.trunc(tile.y / (1 << level_diff));
const level_diff = tile.z - leaf_level;
const leaf_x = Math.trunc(tile.x / (1 << level_diff));
const leaf_y = Math.trunc(tile.y / (1 << level_diff));
return { z: leaf_level, x: leaf_x, y: leaf_y };
}
return null;
};
export const parseHeader = (dataview: DataView): Header => {
var magic = dataview.getUint16(0, true);
const magic = dataview.getUint16(0, true);
if (magic !== 19792) {
throw new Error('File header does not begin with "PM"');
}
var version = dataview.getUint16(2, true);
var json_size = dataview.getUint32(4, true);
var root_entries = dataview.getUint16(8, true);
const version = dataview.getUint16(2, true);
const json_size = dataview.getUint32(4, true);
const root_entries = dataview.getUint16(8, true);
return {
version: version,
json_size: json_size,
@@ -232,7 +232,7 @@ export class PMTiles {
leaves: Map<number, CachedLeaf>;
maxLeaves: number;
constructor(url: string, maxLeaves: number = 64) {
constructor(url: string, maxLeaves = 64) {
this.root = null;
this.url = url;
this.leaves = new Map<number, CachedLeaf>();
@@ -242,11 +242,11 @@ export class PMTiles {
async fetchRoot(url: string): Promise<Root> {
const controller = new AbortController();
const signal = controller.signal;
let resp = await fetch(url, {
const resp = await fetch(url, {
signal: signal,
headers: { Range: "bytes=0-511999" },
});
let contentLength = resp.headers.get("Content-Length");
const contentLength = resp.headers.get("Content-Length");
if (!contentLength || +contentLength !== 512000) {
console.error(
"Content-Length mismatch indicates byte serving not supported; aborting."
@@ -254,10 +254,10 @@ export class PMTiles {
controller.abort();
}
let a = await resp.arrayBuffer();
let header = parseHeader(new DataView(a, 0, 10));
const a = await resp.arrayBuffer();
const header = parseHeader(new DataView(a, 0, 10));
var root_dir = new DataView(
let root_dir = new DataView(
a,
10 + header.json_size,
17 * header.root_entries
@@ -281,9 +281,9 @@ export class PMTiles {
}
async metadata(): Promise<any> {
let root = await this.getRoot();
let dec = new TextDecoder("utf-8");
let result = JSON.parse(
const root = await this.getRoot();
const dec = new TextDecoder("utf-8");
const result = JSON.parse(
dec.decode(new DataView(root.buffer, 10, root.header.json_size))
);
if (result.compression) {
@@ -310,13 +310,13 @@ export class PMTiles {
}
async fetchLeafdir(version: number, entry: Entry): Promise<ArrayBuffer> {
let resp = await fetch(this.url, {
const resp = await fetch(this.url, {
headers: {
Range:
"bytes=" + entry.offset + "-" + (entry.offset + entry.length - 1),
},
});
var buf = await resp.arrayBuffer();
let buf = await resp.arrayBuffer();
if (version === 1) {
console.warn("Sorting pmtiles v1 directory.");
@@ -327,18 +327,18 @@ export class PMTiles {
}
async getLeafdir(version: number, entry: Entry): Promise<ArrayBuffer> {
let leaf = this.leaves.get(entry.offset);
const leaf = this.leaves.get(entry.offset);
if (leaf) return await leaf.buffer;
var buf = this.fetchLeafdir(version, entry);
const buf = this.fetchLeafdir(version, entry);
this.leaves.set(entry.offset, {
lastUsed: performance.now(),
buffer: buf,
});
if (this.leaves.size > this.maxLeaves) {
var minUsed = Infinity;
var minKey = undefined;
let minUsed = Infinity;
let minKey = undefined;
this.leaves.forEach((val, key) => {
if (val.lastUsed < minUsed) {
minUsed = val.lastUsed;
@@ -351,20 +351,23 @@ export class PMTiles {
}
async getZxy(z: number, x: number, y: number): Promise<Entry | null> {
let root = await this.getRoot();
let entry = queryTile(root.dir, z, x, y);
const root = await this.getRoot();
const entry = queryTile(root.dir, z, x, y);
if (entry) return entry;
let leafcoords = deriveLeaf(root, { z: z, x: x, y: y });
const leafcoords = deriveLeaf(root, { z: z, x: x, y: y });
if (leafcoords) {
let leafdir_entry = queryLeafdir(
const leafdir_entry = queryLeafdir(
root.dir,
leafcoords.z,
leafcoords.x,
leafcoords.y
);
if (leafdir_entry) {
let leafdir = await this.getLeafdir(root.header.version, leafdir_entry);
const leafdir = await this.getLeafdir(
root.header.version,
leafdir_entry
);
return queryTile(new DataView(leafdir), z, x, y);
}
}
@@ -373,9 +376,9 @@ export class PMTiles {
}
export const leafletLayer = (source: PMTiles, options: any) => {
var cls = L.GridLayer.extend({
const cls = L.GridLayer.extend({
createTile: function (coord: any, done: any) {
var tile: any = document.createElement("img");
const tile: any = document.createElement("img");
source.getZxy(coord.z, coord.x, coord.y).then((result) => {
if (result === null) return;
@@ -398,8 +401,8 @@ export const leafletLayer = (source: PMTiles, options: any) => {
return resp.arrayBuffer();
})
.then((buf) => {
var blob = new Blob([buf], { type: "image/png" });
var imageUrl = window.URL.createObjectURL(blob);
const blob = new Blob([buf], { type: "image/png" });
const imageUrl = window.URL.createObjectURL(blob);
tile.src = imageUrl;
tile.cancel = null;
done(null, tile);
@@ -412,7 +415,7 @@ export const leafletLayer = (source: PMTiles, options: any) => {
},
_removeTile: function (key: string) {
var tile = this._tiles[key];
const tile = this._tiles[key];
if (!tile) {
return;
}