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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
import { memcpy } from '../util/buffer.js';
import {
TypedArray, TypedArrayConstructor,
BigIntArray, BigIntArrayConstructor
} from '../interfaces.js';
/** @ignore */ type DataValue<T> = T extends TypedArray ? number : T extends BigIntArray ? WideValue<T> : T;
/** @ignore */ type WideValue<T extends BigIntArray> = T extends BigIntArray ? bigint | Int32Array | Uint32Array : never;
/** @ignore */ type ArrayCtor<T extends TypedArray | BigIntArray> =
T extends TypedArray ? TypedArrayConstructor<T> :
T extends BigIntArray ? BigIntArrayConstructor<T> :
any;
/** @ignore */
const roundLengthUpToNearest64Bytes = (len: number, BPE: number) => ((((Math.ceil(len) * BPE) + 63) & ~63) || 64) / BPE;
/** @ignore */
const sliceOrExtendArray = <T extends TypedArray | BigIntArray>(arr: T, len = 0) => (
arr.length >= len ? arr.subarray(0, len) : memcpy(new (arr.constructor as any)(len), arr, 0)
) as T;
/** @ignore */
export interface BufferBuilder<T extends TypedArray | BigIntArray = any, TValue = DataValue<T>> {
readonly offset: number;
}
/** @ignore */
export class BufferBuilder<T extends TypedArray | BigIntArray = any, TValue = DataValue<T>> {
constructor(buffer: T, stride = 1) {
this.buffer = buffer;
this.stride = stride;
this.BYTES_PER_ELEMENT = buffer.BYTES_PER_ELEMENT;
this.ArrayType = buffer.constructor as ArrayCtor<T>;
this._resize(this.length = Math.ceil(buffer.length / stride));
}
public buffer: T;
public length: number;
public readonly stride: number;
public readonly ArrayType: ArrayCtor<T>;
public readonly BYTES_PER_ELEMENT: number;
public get byteLength() {
return Math.ceil(this.length * this.stride) * this.BYTES_PER_ELEMENT;
}
public get reservedLength() { return this.buffer.length / this.stride; }
public get reservedByteLength() { return this.buffer.byteLength; }
// @ts-ignore
public set(index: number, value: TValue) { return this; }
public append(value: TValue) { return this.set(this.length, value); }
public reserve(extra: number) {
if (extra > 0) {
this.length += extra;
const stride = this.stride;
const length = this.length * stride;
const reserved = this.buffer.length;
if (length >= reserved) {
this._resize(reserved === 0
? roundLengthUpToNearest64Bytes(length * 1, this.BYTES_PER_ELEMENT)
: roundLengthUpToNearest64Bytes(length * 2, this.BYTES_PER_ELEMENT)
);
}
}
return this;
}
public flush(length = this.length) {
length = roundLengthUpToNearest64Bytes(length * this.stride, this.BYTES_PER_ELEMENT);
const array = sliceOrExtendArray<T>(this.buffer, length);
this.clear();
return array;
}
public clear() {
this.length = 0;
this._resize(0);
return this;
}
protected _resize(newLength: number) {
return this.buffer = <T>memcpy(new this.ArrayType(newLength), this.buffer);
}
}
(BufferBuilder.prototype as any).offset = 0;
/** @ignore */
export class DataBufferBuilder<T extends TypedArray> extends BufferBuilder<T, number> {
public last() { return this.get(this.length - 1); }
public get(index: number) { return this.buffer[index]; }
public set(index: number, value: number) {
this.reserve(index - this.length + 1);
this.buffer[index * this.stride] = value;
return this;
}
}
/** @ignore */
export class BitmapBufferBuilder extends DataBufferBuilder<Uint8Array> {
constructor(data = new Uint8Array(0)) { super(data, 1 / 8); }
public numValid = 0;
public get numInvalid() { return this.length - this.numValid; }
public get(idx: number) { return this.buffer[idx >> 3] >> idx % 8 & 1; }
public set(idx: number, val: number) {
const { buffer } = this.reserve(idx - this.length + 1);
const byte = idx >> 3, bit = idx % 8, cur = buffer[byte] >> bit & 1;
// If `val` is truthy and the current bit is 0, flip it to 1 and increment `numValid`.
// If `val` is falsey and the current bit is 1, flip it to 0 and decrement `numValid`.
val ? cur === 0 && ((buffer[byte] |= (1 << bit)), ++this.numValid)
: cur === 1 && ((buffer[byte] &= ~(1 << bit)), --this.numValid);
return this;
}
public clear() {
this.numValid = 0;
return super.clear();
}
}
/** @ignore */
export class OffsetsBufferBuilder extends DataBufferBuilder<Int32Array> {
constructor(data = new Int32Array(1)) { super(data, 1); }
public append(value: number) {
return this.set(this.length - 1, value);
}
public set(index: number, value: number) {
const offset = this.length - 1;
const buffer = this.reserve(index - offset + 1).buffer;
if (offset < index++) {
buffer.fill(buffer[offset], offset, index);
}
buffer[index] = buffer[index - 1] + value;
return this;
}
public flush(length = this.length - 1) {
if (length > this.length) {
this.set(length - 1, 0);
}
return super.flush(length + 1);
}
}
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