Telegram Web K with changes to work inside I2P https://web.telegram.i2p/
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3 years ago
/*
* https://github.com/morethanwords/tweb
* Copyright (C) 2019-2021 Eduard Kuzmenko
* https://github.com/morethanwords/tweb/blob/master/LICENSE
*/
import { MOUNT_CLASS_TO } from "../config/debug";
/**
* Descend sorted storage
*/
type ItemType = number;
export enum SliceEnd {
None = 0,
Top = 1,
Bottom = 2,
Both = SliceEnd.Top | SliceEnd.Bottom
};
export interface Slice extends Array<ItemType> {
//slicedArray: SlicedArray;
end: SliceEnd;
isEnd: (side: SliceEnd) => boolean;
setEnd: (side: SliceEnd) => void;
unsetEnd: (side: SliceEnd) => void;
slice: (from?: number, to?: number) => Slice;
splice: (start: number, deleteCount: number, ...items: ItemType[]) => Slice;
}
export interface SliceConstructor {
new(...items: ItemType[]): Slice;
}
export default class SlicedArray {
private slices: Slice[]/* = [[7,6,5],[4,3,2],[1,0,-1]] */;
private sliceConstructor: SliceConstructor;
constructor() {
// @ts-ignore
this.sliceConstructor = SlicedArray.getSliceConstructor(this);
const first = this.constructSlice();
//first.setEnd(SliceEnd.Bottom);
this.slices = [first];
}
private static getSliceConstructor(slicedArray: SlicedArray) {
return class Slice extends Array<ItemType> implements Slice {
//slicedArray: SlicedArray;
end: SliceEnd = SliceEnd.None;
/* constructor(...items: ItemType[]) {
super(...items);
//this.slicedArray = slicedArray;
} */
isEnd(side: SliceEnd): boolean {
if((this.end & side) === side) {
return true;
}/* else if(!this.slicedArray) {
return false;
} */
let isEnd = false;
if(side === SliceEnd.Top) {
const slice = slicedArray.last;
isEnd = slice.end & side ? this.includes(slice[slice.length - 1])/* || !slice.length */ : false;
} else if(side === SliceEnd.Bottom) {
const slice = slicedArray.first;
isEnd = slice.end & side ? this.includes(slice[0])/* || !slice.length */ : false;
} else if(side === SliceEnd.Both) {
return this.isEnd(SliceEnd.Top) && this.isEnd(SliceEnd.Bottom);
}
if(isEnd) {
this.setEnd(side);
}
return isEnd;
}
setEnd(side: SliceEnd) {
this.end |= side;
}
unsetEnd(side: SliceEnd) {
this.end &= ~side;
3 years ago
}
splice(start: number, deleteCount: number, ...items: ItemType[]) {
const ret = super.splice(start, deleteCount, ...items);
if(!this.length) {
const slices = slicedArray.slices as number[][];
const idx = slices.indexOf(this);
if(idx !== -1) {
if(slices.length === 1) { // left empty slice without ends
this.unsetEnd(SliceEnd.Both);
} else { // delete this slice
slices.splice(idx, 1);
}
}
}
return ret;
}
}
}
public constructSlice(...items: ItemType[]) {
//const slice = new Slice(this, ...items);
// can't pass items directly to constructor because first argument is length
const slice = new this.sliceConstructor(items.length);
for(let i = 0, length = items.length; i < length; ++i) {
slice[i] = items[i];
}
return slice;
// ! code below will slow execution in 15 times
/* const self = this;
const p: Slice = new Proxy(slice, {
get: function(target, name: any) {
if(name === 'constructor') {
const p = new Proxy(Slice, {
construct: (target, args) => {
return self.constructSlice(...args);
}
});
return p;
}
return target[name];
}
});
return p; */
/*
var p = slicedArray.constructSlice();
p.length = 100000;
p.fill(255);
var a = new Array(100000);
a.fill(255);
var b = 0;
var perf = performance.now();
for(var i = 0; i < p.length; ++i) {
b += p[i];
}
console.log('perf 1', performance.now() - perf);
b = 0;
perf = performance.now();
for(var i = 0; i < a.length; ++i) {
b += a[i];
}
console.log('perf 2', performance.now() - perf);
*/
}
public insertSlice(slice: ItemType[], flatten = true) {
if(!slice.length) {
return;
}
const first = this.slices[0];
if(!first.length) {
first.push(...slice);
return first;
}
const lowerBound = slice[slice.length - 1];
const upperBound = slice[0];
let foundSlice: Slice, lowerIndex = -1, upperIndex = -1, foundSliceIndex = 0;
for(; foundSliceIndex < this.slices.length; ++foundSliceIndex) {
foundSlice = this.slices[foundSliceIndex];
lowerIndex = foundSlice.indexOf(lowerBound);
upperIndex = foundSlice.indexOf(upperBound);
if(upperIndex !== -1 && -1 !== lowerIndex) {
break;
} else if(upperIndex !== -1 || -1 !== lowerIndex) {
break;
}
}
if(upperIndex !== -1 && -1 !== lowerIndex) {
} else if(upperIndex !== -1) { // ([1, 2, 3] | [1, 2, 3, 4, 5]) -> [1, 2, 3, 4, 5]
const sliced = slice.slice(foundSlice.length - upperIndex);
foundSlice.push(...sliced);
} else if(lowerIndex !== -1) { // ([1, 2, 3] | [-1, 0, 1]) -> [-1, 0, 1, 2, 3]
const sliced = slice.slice(0, slice.length - lowerIndex - 1);
foundSlice.unshift(...sliced);
} else {
let insertIndex = 0;
for(const length = this.slices.length; insertIndex < length; ++insertIndex) { // * maybe should iterate from the end, could be faster ?
const s = this.slices[insertIndex];
if(slice[0] > s[0]) {
break;
}
}
this.slices.splice(insertIndex, 0, this.constructSlice(...slice));
foundSliceIndex = insertIndex;
}
if(flatten) {
return this.flatten(foundSliceIndex);
}
}
private flatten(foundSliceIndex: number) {
if(this.slices.length >= 2) {
for(let i = 0, length = this.slices.length; i < (length - 1); ++i) {
const prevSlice = this.slices[i];
const nextSlice = this.slices[i + 1];
const upperIndex = prevSlice.indexOf(nextSlice[0]);
if(upperIndex !== -1) {
prevSlice.setEnd(nextSlice.end);
this.slices.splice(i + 1, 1);
if(i < foundSliceIndex) {
--foundSliceIndex;
}
--length; // respect array bounds
--i; // repeat from the same place
this.insertSlice(nextSlice, false);
}
}
}
return this.slices[foundSliceIndex];
}
// *
get first() {
return this.slices[0];
}
get last() {
return this.slices[this.slices.length - 1];
}
get slice() {
return this.first;
}
get length() {
return this.slice.length;
}
public findSlice(item: ItemType) {
for(let i = 0, length = this.slices.length; i < length; ++i) {
const slice = this.slices[i];
const index = slice.indexOf(item);
if(index !== -1) {
return {slice, index};
}
}
return undefined;
}
public findSliceOffset(maxId: number) {
let slice: Slice;
for(let i = 0; i < this.slices.length; ++i) {
let offset = 0;
slice = this.slices[i];
if(slice.length < 2) {
continue;
}
for(; offset < slice.length; offset++) {
if(maxId >= slice[offset]) {
/* if(!offset) { // because can't find 3 in [[5,4], [2,1]]
return undefined;
} */
return {
slice,
offset: maxId === slice[offset] ? offset : offset - 1
};
}
}
}
if(slice && slice.isEnd(SliceEnd.Top)) {
return {
slice,
offset: slice.length
};
}
return undefined;
}
// * https://core.telegram.org/api/offsets
public sliceMe(offsetId: number, add_offset: number, limit: number) {
let slice = this.slice;
let offset = 0;
let sliceOffset = 0;
if(offsetId) {
const pos = this.findSliceOffset(offsetId);
if(!pos) {
return undefined;
}
slice = pos.slice;
offset = sliceOffset = pos.offset;
if(slice.includes(offsetId)) {
sliceOffset += 1;
}
/* if(slice.includes(offsetId) && add_offset < 0) {
add_offset += 1;
} */
}
let sliceStart = Math.max(sliceOffset + add_offset, 0);
let sliceEnd = sliceOffset + add_offset + limit;
//const fixHalfBackLimit = add_offset && !(limit / add_offset % 2) && (sliceEnd % 2) ? 1 : 0;
//sliceEnd += fixHalfBackLimit;
const sliced = slice.slice(sliceStart, sliceEnd) as Slice;
const topWasMeantToLoad = add_offset < 0 ? limit + add_offset : limit;
const bottomWasMeantToLoad = Math.abs(add_offset);
// can use 'slice' here to check because if it's end, then 'sliced' is out of 'slice'
// useful when there is only 1 message in chat on its reopening
const topFulfilled = (slice.length - sliceOffset) >= topWasMeantToLoad || (slice.isEnd(SliceEnd.Top) ? (sliced.setEnd(SliceEnd.Top), true) : false);
const bottomFulfilled = (sliceOffset - bottomWasMeantToLoad) >= 0 || (slice.isEnd(SliceEnd.Bottom) ? (sliced.setEnd(SliceEnd.Bottom), true) : false);
//console.log('sliceMe', topFulfilled, bottomFulfilled);
return {
slice: sliced,
offsetIdOffset: offset,
fulfilled: SliceEnd.None | (topFulfilled && bottomFulfilled ? SliceEnd.Both : ((topFulfilled ? SliceEnd.Top : SliceEnd.None) | (bottomFulfilled ? SliceEnd.Bottom : SliceEnd.None)))
};
}
public unshift(...items: ItemType[]) {
let slice = this.first;
if(!slice.length) {
slice.setEnd(SliceEnd.Bottom);
} else if(!slice.isEnd(SliceEnd.Bottom)) {
slice = this.constructSlice();
slice.setEnd(SliceEnd.Bottom);
this.slices.unshift(slice);
}
slice.unshift(...items);
}
public push(...items: ItemType[]) {
let slice = this.last;
if(!slice.length) {
slice.setEnd(SliceEnd.Top);
} else if(!slice.isEnd(SliceEnd.Top)) {
slice = this.constructSlice();
slice.setEnd(SliceEnd.Top);
this.slices.push(slice);
}
slice.push(...items);
}
public delete(item: ItemType) {
const found = this.findSlice(item);
if(found) {
found.slice.splice(found.index, 1);
return true;
}
return false;
}
}
MOUNT_CLASS_TO && (MOUNT_CLASS_TO.SlicedArray = SlicedArray);