[JS/TS] Rewrite flexbuffers JS to TS (#6148)
* Partial TS rewrite * Completed port but bugs remain * Expose builder function * Break out and fix stack-value and formatting
This commit is contained in:
Björn Harrtell
GitHub
parent
9fa1d27059
commit
b46db38f57
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@ -130,8 +130,8 @@ package-lock.json
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/*.ilk
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/*.pdb
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.clwb
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js/*.js
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js/*.d.ts
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mjs/*.js
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mjs/*.d.ts
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js/**/*.js
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js/**/*.d.ts
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mjs/**/*.js
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mjs/**/*.d.ts
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yarn-error.log
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1048
js/flexbuffers.js
1048
js/flexbuffers.js
File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,30 @@
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/* eslint-disable @typescript-eslint/no-namespace */
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import { Builder } from './flexbuffers/builder'
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import { toReference as toReferenceFunction } from './flexbuffers/reference';
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export function builder(): Builder {
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return new Builder();
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}
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export function toObject(buffer: Uint8Array): unknown {
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return toReferenceFunction(buffer).toObject();
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}
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export function encode(object: unknown, size = 2048, deduplicateStrings = true, deduplicateKeys = true, deduplicateKeyVectors = true): Uint8Array {
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const builder = new Builder(size > 0 ? size : 2048, deduplicateStrings, deduplicateKeys, deduplicateKeyVectors);
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builder.add(object);
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return builder.finish();
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}
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const builderFunction = builder
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const toObjectFunction = toObject
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const encodeFunction = encode
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export namespace flexbuffers {
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export const builder = builderFunction;
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export const toObject = toObjectFunction;
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export const encode = encodeFunction;
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export const toReference = toReferenceFunction;
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}
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export default flexbuffers;
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@ -0,0 +1,34 @@
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import { BitWidth } from './bit-width'
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export function toByteWidth(bitWidth: BitWidth): number {
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return 1 << bitWidth;
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}
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export function iwidth(value: number | bigint): BitWidth {
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if (value >= -128 && value <= 127) return BitWidth.WIDTH8;
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if (value >= -32768 && value <= 32767) return BitWidth.WIDTH16;
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if (value >= -2147483648 && value <= 2147483647) return BitWidth.WIDTH32;
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return BitWidth.WIDTH64;
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}
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export function fwidth(value: number): BitWidth {
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return value === Math.fround(value) ? BitWidth.WIDTH32 : BitWidth.WIDTH64;
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}
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export function uwidth(value: number): BitWidth {
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if (value <= 255) return BitWidth.WIDTH8;
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if (value <= 65535) return BitWidth.WIDTH16;
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if (value <= 4294967295) return BitWidth.WIDTH32;
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return BitWidth.WIDTH64;
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}
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export function fromByteWidth(value: number): BitWidth {
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if (value === 1) return BitWidth.WIDTH8;
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if (value === 2) return BitWidth.WIDTH16;
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if (value === 4) return BitWidth.WIDTH32;
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return BitWidth.WIDTH64;
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}
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export function paddingSize(bufSize: number, scalarSize: number): number {
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return (~bufSize + 1) & (scalarSize - 1);
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}
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@ -0,0 +1,6 @@
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export enum BitWidth {
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WIDTH8 = 0,
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WIDTH16 = 1,
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WIDTH32 = 2,
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WIDTH64 = 3,
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}
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@ -0,0 +1,549 @@
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import { BitWidth } from './bit-width'
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import { paddingSize, iwidth, uwidth, fwidth, toByteWidth, fromByteWidth } from './bit-width-util'
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import { toUTF8Array } from './flexbuffers-util'
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import { ValueType } from './value-type'
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import { isNumber, isTypedVectorElement, toTypedVector } from './value-type-util'
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import { StackValue } from './stack-value'
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interface StackPointer {
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stackPosition: number,
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isVector: boolean
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presorted?: boolean
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}
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export class Builder {
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buffer: ArrayBuffer
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view: DataView
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readonly stack: Array<StackValue> = [];
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readonly stackPointers: Array<StackPointer> = [];
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offset = 0;
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finished = false;
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readonly stringLookup: Record<string, StackValue> = {};
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readonly keyLookup: Record<string, StackValue> = {};
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readonly keyVectorLookup: Record<string, StackValue> = {};
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readonly indirectIntLookup: Record<number, StackValue> = {};
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readonly indirectUIntLookup: Record<number, StackValue> = {};
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readonly indirectFloatLookup: Record<number, StackValue> = {};
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constructor(size = 2048, private dedupStrings = true, private dedupKeys = true, private dedupKeyVectors = true) {
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this.buffer = new ArrayBuffer(size > 0 ? size : 2048);
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this.view = new DataView(this.buffer);
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}
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private align(width: BitWidth) {
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const byteWidth = toByteWidth(width);
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this.offset += paddingSize(this.offset, byteWidth);
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return byteWidth;
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}
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computeOffset(newValueSize: number): number {
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const targetOffset = this.offset + newValueSize;
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let size = this.buffer.byteLength;
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const prevSize = size;
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while (size < targetOffset) {
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size <<= 1;
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}
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if (prevSize < size) {
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const prevBuffer = this.buffer;
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this.buffer = new ArrayBuffer(size);
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this.view = new DataView(this.buffer);
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new Uint8Array(this.buffer).set(new Uint8Array(prevBuffer), 0);
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}
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return targetOffset;
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}
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pushInt(value: number, width: BitWidth): void {
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if (width === BitWidth.WIDTH8) {
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this.view.setInt8(this.offset, value);
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} else if (width === BitWidth.WIDTH16) {
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this.view.setInt16(this.offset, value, true);
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} else if (width === BitWidth.WIDTH32) {
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this.view.setInt32(this.offset, value, true);
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} else if (width === BitWidth.WIDTH64) {
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this.view.setBigInt64(this.offset, BigInt(value), true);
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} else {
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throw `Unexpected width: ${width} for value: ${value}`;
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}
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}
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pushUInt(value: number, width: BitWidth): void {
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if (width === BitWidth.WIDTH8) {
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this.view.setUint8(this.offset, value);
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} else if (width === BitWidth.WIDTH16) {
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this.view.setUint16(this.offset, value, true);
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} else if (width === BitWidth.WIDTH32) {
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this.view.setUint32(this.offset, value, true);
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} else if (width === BitWidth.WIDTH64) {
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this.view.setBigUint64(this.offset, BigInt(value), true);
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} else {
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throw `Unexpected width: ${width} for value: ${value}`;
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}
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}
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private writeInt(value: number, byteWidth: number) {
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const newOffset = this.computeOffset(byteWidth);
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this.pushInt(value, fromByteWidth(byteWidth));
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this.offset = newOffset;
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}
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private writeUInt(value: number, byteWidth: number) {
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const newOffset = this.computeOffset(byteWidth);
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this.pushUInt(value, fromByteWidth(byteWidth));
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this.offset = newOffset;
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}
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private writeBlob(arrayBuffer: ArrayBuffer) {
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const length = arrayBuffer.byteLength;
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const bitWidth = uwidth(length);
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const byteWidth = this.align(bitWidth);
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this.writeUInt(length, byteWidth);
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const blobOffset = this.offset;
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const newOffset = this.computeOffset(length);
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new Uint8Array(this.buffer).set(new Uint8Array(arrayBuffer), blobOffset);
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this.stack.push(this.offsetStackValue(blobOffset, ValueType.BLOB, bitWidth));
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this.offset = newOffset;
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}
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private writeString(str: string): void {
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if (this.dedupStrings && Object.prototype.hasOwnProperty.call(this.stringLookup, str)) {
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this.stack.push(this.stringLookup[str]);
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return;
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}
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const utf8 = toUTF8Array(str);
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const length = utf8.length;
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const bitWidth = uwidth(length);
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const byteWidth = this.align(bitWidth);
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this.writeUInt(length, byteWidth);
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const stringOffset = this.offset;
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const newOffset = this.computeOffset(length + 1);
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new Uint8Array(this.buffer).set(utf8, stringOffset);
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const stackValue = this.offsetStackValue(stringOffset, ValueType.STRING, bitWidth);
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this.stack.push(stackValue);
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if (this.dedupStrings) {
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this.stringLookup[str] = stackValue;
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}
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this.offset = newOffset;
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}
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private writeKey(str: string): void {
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if (this.dedupKeys && Object.prototype.hasOwnProperty.call(this.keyLookup, str)) {
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this.stack.push(this.keyLookup[str]);
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return;
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}
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const utf8 = toUTF8Array(str);
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const length = utf8.length;
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const newOffset = this.computeOffset(length + 1);
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new Uint8Array(this.buffer).set(utf8, this.offset);
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const stackValue = this.offsetStackValue(this.offset, ValueType.KEY, BitWidth.WIDTH8);
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this.stack.push(stackValue);
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if (this.dedupKeys) {
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this.keyLookup[str] = stackValue;
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}
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this.offset = newOffset;
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}
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private writeStackValue(value: StackValue, byteWidth: number): void {
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const newOffset = this.computeOffset(byteWidth);
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if (value.isOffset()) {
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const relativeOffset = this.offset - value.offset;
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if (byteWidth === 8 || BigInt(relativeOffset) < (BigInt(1) << BigInt(byteWidth * 8))) {
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this.writeUInt(relativeOffset, byteWidth);
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} else {
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throw `Unexpected size ${byteWidth}. This might be a bug. Please create an issue https://github.com/google/flatbuffers/issues/new`
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}
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} else {
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value.writeToBuffer(byteWidth);
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}
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this.offset = newOffset;
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}
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private integrityCheckOnValueAddition() {
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if (this.finished) {
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throw "Adding values after finish is prohibited";
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}
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if (this.stackPointers.length !== 0 && this.stackPointers[this.stackPointers.length - 1].isVector === false) {
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if (this.stack[this.stack.length - 1].type !== ValueType.KEY) {
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throw "Adding value to a map before adding a key is prohibited";
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}
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}
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}
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private integrityCheckOnKeyAddition() {
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if (this.finished) {
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throw "Adding values after finish is prohibited";
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}
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if (this.stackPointers.length === 0 || this.stackPointers[this.stackPointers.length - 1].isVector) {
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throw "Adding key before starting a map is prohibited";
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}
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}
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startVector(): void {
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this.stackPointers.push({ stackPosition: this.stack.length, isVector: true });
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}
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startMap(presorted = false): void {
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this.stackPointers.push({ stackPosition: this.stack.length, isVector: false, presorted: presorted });
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}
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private endVector(stackPointer: StackPointer) {
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const vecLength = this.stack.length - stackPointer.stackPosition;
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const vec = this.createVector(stackPointer.stackPosition, vecLength, 1);
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this.stack.splice(stackPointer.stackPosition, vecLength);
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this.stack.push(vec);
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}
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private endMap(stackPointer: StackPointer) {
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if (!stackPointer.presorted) {
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this.sort(stackPointer);
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}
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let keyVectorHash = "";
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for (let i = stackPointer.stackPosition; i < this.stack.length; i += 2) {
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keyVectorHash += `,${this.stack[i].offset}`;
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}
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const vecLength = (this.stack.length - stackPointer.stackPosition) >> 1;
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if (this.dedupKeyVectors && !Object.prototype.hasOwnProperty.call(this.keyVectorLookup, keyVectorHash)) {
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this.keyVectorLookup[keyVectorHash] = this.createVector(stackPointer.stackPosition, vecLength, 2);
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}
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const keysStackValue = this.dedupKeyVectors ? this.keyVectorLookup[keyVectorHash] : this.createVector(stackPointer.stackPosition, vecLength, 2);
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const valuesStackValue = this.createVector(stackPointer.stackPosition + 1, vecLength, 2, keysStackValue);
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this.stack.splice(stackPointer.stackPosition, vecLength << 1);
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this.stack.push(valuesStackValue);
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}
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private sort(stackPointer: StackPointer) {
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const view = this.view
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const stack = this.stack
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function shouldFlip(v1: StackValue, v2: StackValue) {
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if (v1.type !== ValueType.KEY || v2.type !== ValueType.KEY) {
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throw `Stack values are not keys ${v1} | ${v2}. Check if you combined [addKey] with add... method calls properly.`
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}
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let c1, c2;
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let index = 0;
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do {
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c1 = view.getUint8(v1.offset + index);
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c2 = view.getUint8(v2.offset + index);
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if (c2 < c1) return true;
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if (c1 < c2) return false;
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index += 1;
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} while (c1 !== 0 && c2 !== 0);
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return false;
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}
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function swap(stack: Array<StackValue>, flipIndex: number, i: number) {
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if (flipIndex === i) return;
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const k = stack[flipIndex];
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const v = stack[flipIndex + 1];
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stack[flipIndex] = stack[i];
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stack[flipIndex + 1] = stack[i + 1];
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stack[i] = k;
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stack[i + 1] = v;
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}
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function selectionSort() {
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for (let i = stackPointer.stackPosition; i < stack.length; i += 2) {
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let flipIndex = i;
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for (let j = i + 2; j < stack.length; j += 2) {
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if (shouldFlip(stack[flipIndex], stack[j])) {
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flipIndex = j;
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}
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}
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if (flipIndex !== i) {
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swap(stack, flipIndex, i);
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}
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}
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}
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function smaller(v1: StackValue, v2: StackValue) {
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if (v1.type !== ValueType.KEY || v2.type !== ValueType.KEY) {
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throw `Stack values are not keys ${v1} | ${v2}. Check if you combined [addKey] with add... method calls properly.`
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}
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if (v1.offset === v2.offset) {
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return false;
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}
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let c1, c2;
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let index = 0;
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do {
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c1 = view.getUint8(v1.offset + index);
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c2 = view.getUint8(v2.offset + index);
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if (c1 < c2) return true;
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if (c2 < c1) return false;
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index += 1;
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} while (c1 !== 0 && c2 !== 0);
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return false;
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}
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function quickSort(left: number, right: number) {
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if (left < right) {
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const mid = left + (((right - left) >> 2)) * 2;
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const pivot = stack[mid];
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let left_new = left;
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let right_new = right;
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do {
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while (smaller(stack[left_new], pivot)) {
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left_new += 2;
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}
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while (smaller(pivot, stack[right_new])) {
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right_new -= 2;
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}
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if (left_new <= right_new) {
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swap(stack, left_new, right_new);
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left_new += 2;
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right_new -= 2;
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}
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} while (left_new <= right_new);
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quickSort(left, right_new);
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quickSort(left_new, right);
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}
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}
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let sorted = true;
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for (let i = stackPointer.stackPosition; i < this.stack.length - 2; i += 2) {
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if (shouldFlip(this.stack[i], this.stack[i + 2])) {
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sorted = false;
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break;
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}
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}
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if (!sorted) {
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if (this.stack.length - stackPointer.stackPosition > 40) {
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quickSort(stackPointer.stackPosition, this.stack.length - 2);
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} else {
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selectionSort();
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}
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}
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}
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end(): void {
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if (this.stackPointers.length < 1) return;
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const pointer = this.stackPointers.pop() as StackPointer;
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if (pointer.isVector) {
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this.endVector(pointer);
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} else {
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this.endMap(pointer);
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}
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}
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private createVector(start: number, vecLength: number, step: number, keys: StackValue | null = null) {
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let bitWidth = uwidth(vecLength);
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let prefixElements = 1;
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if (keys !== null) {
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const elementWidth = keys.elementWidth(this.offset, 0);
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if (elementWidth > bitWidth) {
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bitWidth = elementWidth;
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}
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prefixElements += 2;
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}
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let vectorType = ValueType.KEY;
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let typed = keys === null;
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for (let i = start; i < this.stack.length; i += step) {
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const elementWidth = this.stack[i].elementWidth(this.offset, i + prefixElements);
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if (elementWidth > bitWidth) {
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bitWidth = elementWidth;
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}
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if (i === start) {
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vectorType = this.stack[i].type;
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typed = typed && isTypedVectorElement(vectorType);
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} else {
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if (vectorType !== this.stack[i].type) {
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typed = false;
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}
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}
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}
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const byteWidth = this.align(bitWidth);
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const fix = typed && isNumber(vectorType) && vecLength >= 2 && vecLength <= 4;
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if (keys !== null) {
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this.writeStackValue(keys, byteWidth);
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this.writeUInt(1 << keys.width, byteWidth);
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}
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if (!fix) {
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this.writeUInt(vecLength, byteWidth);
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}
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const vecOffset = this.offset;
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for (let i = start; i < this.stack.length; i += step) {
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this.writeStackValue(this.stack[i], byteWidth);
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}
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if (!typed) {
|
||||
for (let i = start; i < this.stack.length; i += step) {
|
||||
this.writeUInt(this.stack[i].storedPackedType(), 1);
|
||||
}
|
||||
}
|
||||
if (keys !== null) {
|
||||
return this.offsetStackValue(vecOffset, ValueType.MAP, bitWidth);
|
||||
}
|
||||
if (typed) {
|
||||
const vType = toTypedVector(vectorType, fix ? vecLength : 0);
|
||||
return this.offsetStackValue(vecOffset, vType, bitWidth);
|
||||
}
|
||||
return this.offsetStackValue(vecOffset, ValueType.VECTOR, bitWidth);
|
||||
}
|
||||
|
||||
private nullStackValue() {
|
||||
return new StackValue(this, ValueType.NULL, BitWidth.WIDTH8);
|
||||
}
|
||||
|
||||
private boolStackValue(value: boolean) {
|
||||
return new StackValue(this, ValueType.BOOL, BitWidth.WIDTH8, value);
|
||||
}
|
||||
|
||||
private intStackValue(value: number | bigint) {
|
||||
return new StackValue(this, ValueType.INT, iwidth(value), value as number);
|
||||
}
|
||||
|
||||
private uintStackValue(value: number) {
|
||||
return new StackValue(this, ValueType.UINT, uwidth(value), value);
|
||||
}
|
||||
|
||||
private floatStackValue(value: number) {
|
||||
return new StackValue(this, ValueType.FLOAT, fwidth(value), value);
|
||||
}
|
||||
|
||||
private offsetStackValue(offset: number, valueType: ValueType, bitWidth: BitWidth): StackValue {
|
||||
return new StackValue(this, valueType, bitWidth, null, offset);
|
||||
}
|
||||
|
||||
private finishBuffer() {
|
||||
if (this.stack.length !== 1) {
|
||||
throw `Stack has to be exactly 1, but it is ${this.stack.length}. You have to end all started vectors and maps before calling [finish]`;
|
||||
}
|
||||
const value = this.stack[0];
|
||||
const byteWidth = this.align(value.elementWidth(this.offset, 0));
|
||||
this.writeStackValue(value, byteWidth);
|
||||
this.writeUInt(value.storedPackedType(), 1);
|
||||
this.writeUInt(byteWidth, 1);
|
||||
this.finished = true;
|
||||
}
|
||||
|
||||
add(value: undefined | null | boolean | bigint | number | DataView | string | Array<unknown> | Record<string, unknown> | unknown): void {
|
||||
this.integrityCheckOnValueAddition();
|
||||
if (typeof value === 'undefined') {
|
||||
throw "You need to provide a value";
|
||||
}
|
||||
if (value === null) {
|
||||
this.stack.push(this.nullStackValue());
|
||||
} else if (typeof value === "boolean") {
|
||||
this.stack.push(this.boolStackValue(value));
|
||||
} else if (typeof value === "bigint") {
|
||||
this.stack.push(this.intStackValue(value));
|
||||
} else if (typeof value == 'number') {
|
||||
if (Number.isInteger(value)) {
|
||||
this.stack.push(this.intStackValue(value));
|
||||
} else {
|
||||
this.stack.push(this.floatStackValue(value));
|
||||
}
|
||||
} else if (ArrayBuffer.isView(value)) {
|
||||
this.writeBlob(value.buffer);
|
||||
} else if (typeof value === 'string' || value instanceof String) {
|
||||
this.writeString(value as string);
|
||||
} else if (Array.isArray(value)) {
|
||||
this.startVector();
|
||||
for (let i = 0; i < value.length; i++) {
|
||||
this.add(value[i]);
|
||||
}
|
||||
this.end();
|
||||
} else if (typeof value === 'object') {
|
||||
const properties = Object.getOwnPropertyNames(value).sort();
|
||||
this.startMap(true);
|
||||
for (let i = 0; i < properties.length; i++) {
|
||||
const key = properties[i];
|
||||
this.addKey(key);
|
||||
this.add((value as Record<string, unknown>)[key]);
|
||||
}
|
||||
this.end();
|
||||
} else {
|
||||
throw `Unexpected value input ${value}`;
|
||||
}
|
||||
}
|
||||
|
||||
finish(): Uint8Array {
|
||||
if (!this.finished) {
|
||||
this.finishBuffer();
|
||||
}
|
||||
const result = this.buffer.slice(0, this.offset);
|
||||
return new Uint8Array(result);
|
||||
}
|
||||
|
||||
isFinished(): boolean {
|
||||
return this.finished;
|
||||
}
|
||||
|
||||
addKey(key: string): void {
|
||||
this.integrityCheckOnKeyAddition();
|
||||
this.writeKey(key);
|
||||
}
|
||||
|
||||
addInt(value: number, indirect = false, deduplicate = false): void {
|
||||
this.integrityCheckOnValueAddition();
|
||||
if (!indirect) {
|
||||
this.stack.push(this.intStackValue(value));
|
||||
return;
|
||||
}
|
||||
if (deduplicate && Object.prototype.hasOwnProperty.call(this.indirectIntLookup, value)) {
|
||||
this.stack.push(this.indirectIntLookup[value]);
|
||||
return;
|
||||
}
|
||||
const stackValue = this.intStackValue(value);
|
||||
const byteWidth = this.align(stackValue.width);
|
||||
const newOffset = this.computeOffset(byteWidth);
|
||||
const valueOffset = this.offset;
|
||||
stackValue.writeToBuffer(byteWidth);
|
||||
const stackOffset = this.offsetStackValue(valueOffset, ValueType.INDIRECT_INT, stackValue.width);
|
||||
this.stack.push(stackOffset);
|
||||
this.offset = newOffset;
|
||||
if (deduplicate) {
|
||||
this.indirectIntLookup[value] = stackOffset;
|
||||
}
|
||||
}
|
||||
|
||||
addUInt(value: number, indirect = false, deduplicate = false): void {
|
||||
this.integrityCheckOnValueAddition();
|
||||
if (!indirect) {
|
||||
this.stack.push(this.uintStackValue(value));
|
||||
return;
|
||||
}
|
||||
if (deduplicate && Object.prototype.hasOwnProperty.call(this.indirectUIntLookup, value)) {
|
||||
this.stack.push(this.indirectUIntLookup[value]);
|
||||
return;
|
||||
}
|
||||
const stackValue = this.uintStackValue(value);
|
||||
const byteWidth = this.align(stackValue.width);
|
||||
const newOffset = this.computeOffset(byteWidth);
|
||||
const valueOffset = this.offset;
|
||||
stackValue.writeToBuffer(byteWidth);
|
||||
const stackOffset = this.offsetStackValue(valueOffset, ValueType.INDIRECT_UINT, stackValue.width);
|
||||
this.stack.push(stackOffset);
|
||||
this.offset = newOffset;
|
||||
if (deduplicate) {
|
||||
this.indirectUIntLookup[value] = stackOffset;
|
||||
}
|
||||
}
|
||||
|
||||
addFloat(value: number, indirect = false, deduplicate = false): void {
|
||||
this.integrityCheckOnValueAddition();
|
||||
if (!indirect) {
|
||||
this.stack.push(this.floatStackValue(value));
|
||||
return;
|
||||
}
|
||||
if (deduplicate && Object.prototype.hasOwnProperty.call(this.indirectFloatLookup, value)) {
|
||||
this.stack.push(this.indirectFloatLookup[value]);
|
||||
return;
|
||||
}
|
||||
const stackValue = this.floatStackValue(value);
|
||||
const byteWidth = this.align(stackValue.width);
|
||||
const newOffset = this.computeOffset(byteWidth);
|
||||
const valueOffset = this.offset;
|
||||
stackValue.writeToBuffer(byteWidth);
|
||||
const stackOffset = this.offsetStackValue(valueOffset, ValueType.INDIRECT_FLOAT, stackValue.width);
|
||||
this.stack.push(stackOffset);
|
||||
this.offset = newOffset;
|
||||
if (deduplicate) {
|
||||
this.indirectFloatLookup[value] = stackOffset;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
export function fromUTF8Array(data: BufferSource): string {
|
||||
const decoder = new TextDecoder();
|
||||
return decoder.decode(data);
|
||||
}
|
||||
|
||||
export function toUTF8Array(str: string) : Uint8Array {
|
||||
const encoder = new TextEncoder();
|
||||
return encoder.encode(str);
|
||||
}
|
||||
|
|
@ -0,0 +1,119 @@
|
|||
import { BitWidth } from './bit-width'
|
||||
import { toByteWidth, fromByteWidth } from './bit-width-util'
|
||||
import { toUTF8Array, fromUTF8Array } from './flexbuffers-util'
|
||||
import { Reference } from './reference'
|
||||
|
||||
import { Long } from '../long'
|
||||
|
||||
export function validateOffset(dataView: DataView, offset: number, width: number): void {
|
||||
if (dataView.byteLength <= offset + width || (offset & (toByteWidth(width) - 1)) !== 0) {
|
||||
throw "Bad offset: " + offset + ", width: " + width;
|
||||
}
|
||||
}
|
||||
|
||||
export function readInt(dataView: DataView, offset: number, width: number): number | Long | bigint {
|
||||
if (width < 2) {
|
||||
if (width < 1) {
|
||||
return dataView.getInt8(offset);
|
||||
} else {
|
||||
return dataView.getInt16(offset, true);
|
||||
}
|
||||
} else {
|
||||
if (width < 3) {
|
||||
return dataView.getInt32(offset, true)
|
||||
} else {
|
||||
if (dataView.setBigInt64 === undefined) {
|
||||
return new Long(dataView.getUint32(offset, true), dataView.getUint32(offset + 4, true))
|
||||
}
|
||||
return dataView.getBigInt64(offset, true)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
export function readUInt(dataView: DataView, offset: number, width: number): number | Long | bigint {
|
||||
if (width < 2) {
|
||||
if (width < 1) {
|
||||
return dataView.getUint8(offset);
|
||||
} else {
|
||||
return dataView.getUint16(offset, true);
|
||||
}
|
||||
} else {
|
||||
if (width < 3) {
|
||||
return dataView.getUint32(offset, true)
|
||||
} else {
|
||||
if (dataView.getBigUint64 === undefined) {
|
||||
return new Long(dataView.getUint32(offset, true), dataView.getUint32(offset + 4, true))
|
||||
}
|
||||
return dataView.getBigUint64(offset, true)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
export function readFloat(dataView: DataView, offset: number, width: number): number {
|
||||
if (width < BitWidth.WIDTH32) {
|
||||
throw "Bad width: " + width;
|
||||
}
|
||||
if (width === BitWidth.WIDTH32) {
|
||||
return dataView.getFloat32(offset, true);
|
||||
}
|
||||
return dataView.getFloat64(offset, true);
|
||||
}
|
||||
|
||||
export function indirect(dataView: DataView, offset: number, width: number): number {
|
||||
const step = readUInt(dataView, offset, width) as number;
|
||||
return offset - step;
|
||||
}
|
||||
|
||||
export function keyIndex(key: string, dataView: DataView, offset: number, parentWidth: number, byteWidth: number, length: number): number | null {
|
||||
const input = toUTF8Array(key);
|
||||
const keysVectorOffset = indirect(dataView, offset, parentWidth) - byteWidth * 3;
|
||||
const bitWidth = fromByteWidth(byteWidth);
|
||||
const indirectOffset = keysVectorOffset - (readUInt(dataView, keysVectorOffset, bitWidth) as number);
|
||||
const _byteWidth = readUInt(dataView, keysVectorOffset + byteWidth, bitWidth) as number;
|
||||
let low = 0;
|
||||
let high = length - 1;
|
||||
while (low <= high) {
|
||||
const mid = (high + low) >> 1;
|
||||
const dif = diffKeys(input, mid, dataView, indirectOffset, _byteWidth);
|
||||
if (dif === 0) return mid;
|
||||
if (dif < 0) {
|
||||
high = mid - 1;
|
||||
} else {
|
||||
low = mid + 1;
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
export function diffKeys(input: Uint8Array, index: number, dataView: DataView, offset: number, width: number): number {
|
||||
const keyOffset = offset + index * width;
|
||||
const keyIndirectOffset = keyOffset - (readUInt(dataView, keyOffset, fromByteWidth(width)) as number);
|
||||
for (let i = 0; i < input.length; i++) {
|
||||
const dif = input[i] - dataView.getUint8(keyIndirectOffset + i);
|
||||
if (dif !== 0) {
|
||||
return dif;
|
||||
}
|
||||
}
|
||||
return dataView.getUint8(keyIndirectOffset + input.length) === 0 ? 0 : -1;
|
||||
}
|
||||
|
||||
export function valueForIndexWithKey(index: number, key: string, dataView: DataView, offset: number, parentWidth: number, byteWidth: number, length: number, path: string): Reference {
|
||||
const _indirect = indirect(dataView, offset, parentWidth);
|
||||
const elementOffset = _indirect + index * byteWidth;
|
||||
const packedType = dataView.getUint8(_indirect + length * byteWidth + index);
|
||||
return new Reference(dataView, elementOffset, fromByteWidth(byteWidth), packedType, `${path}/${key}`)
|
||||
}
|
||||
|
||||
export function keyForIndex(index: number, dataView: DataView, offset: number, parentWidth: number, byteWidth: number): string {
|
||||
const keysVectorOffset = indirect(dataView, offset, parentWidth) - byteWidth * 3;
|
||||
const bitWidth = fromByteWidth(byteWidth);
|
||||
const indirectOffset = keysVectorOffset - (readUInt(dataView, keysVectorOffset, bitWidth) as number);
|
||||
const _byteWidth = readUInt(dataView, keysVectorOffset + byteWidth, bitWidth) as number;
|
||||
const keyOffset = indirectOffset + index * _byteWidth;
|
||||
const keyIndirectOffset = keyOffset - (readUInt(dataView, keyOffset, fromByteWidth(_byteWidth)) as number);
|
||||
let length = 0;
|
||||
while (dataView.getUint8(keyIndirectOffset + length) !== 0) {
|
||||
length++;
|
||||
}
|
||||
return fromUTF8Array(new Uint8Array(dataView.buffer, keyIndirectOffset, length));
|
||||
}
|
||||
|
|
@ -0,0 +1,185 @@
|
|||
import { fromByteWidth } from './bit-width-util'
|
||||
import { ValueType } from './value-type'
|
||||
import { isNumber, isIndirectNumber, isAVector, fixedTypedVectorElementSize, isFixedTypedVector, isTypedVector, typedVectorElementType, packedType, fixedTypedVectorElementType } from './value-type-util'
|
||||
import { indirect, keyForIndex, keyIndex, readFloat, readInt, readUInt, valueForIndexWithKey } from './reference-util'
|
||||
import { Long } from '../long';
|
||||
import { fromUTF8Array } from './flexbuffers-util';
|
||||
import { BitWidth } from './bit-width';
|
||||
|
||||
export function toReference(buffer: Uint8Array): Reference {
|
||||
const len = buffer.byteLength;
|
||||
|
||||
if (len < 3) {
|
||||
throw "Buffer needs to be bigger than 3";
|
||||
}
|
||||
|
||||
const dataView = new DataView(buffer);
|
||||
const byteWidth = dataView.getUint8(len - 1);
|
||||
const packedType = dataView.getUint8(len - 2);
|
||||
const parentWidth = fromByteWidth(byteWidth);
|
||||
const offset = len - byteWidth - 2;
|
||||
|
||||
return new Reference(dataView, offset, parentWidth, packedType, "/")
|
||||
}
|
||||
|
||||
export class Reference {
|
||||
private readonly byteWidth: number
|
||||
private readonly valueType: ValueType
|
||||
private _length = -1
|
||||
constructor(private dataView: DataView, private offset: number, private parentWidth: number, private packedType: ValueType, private path: string) {
|
||||
this.byteWidth = 1 << (packedType & 3)
|
||||
this.valueType = packedType >> 2
|
||||
}
|
||||
|
||||
isNull(): boolean { return this.valueType === ValueType.NULL; }
|
||||
isNumber(): boolean { return isNumber(this.valueType) || isIndirectNumber(this.valueType); }
|
||||
isFloat(): boolean { return ValueType.FLOAT === this.valueType || ValueType.INDIRECT_FLOAT === this.valueType; }
|
||||
isInt(): boolean { return this.isNumber() && !this.isFloat(); }
|
||||
isString(): boolean { return ValueType.STRING === this.valueType || ValueType.KEY === this.valueType; }
|
||||
isBool(): boolean { return ValueType.BOOL === this.valueType; }
|
||||
isBlob(): boolean { return ValueType.BLOB === this.valueType; }
|
||||
isVector(): boolean { return isAVector(this.valueType); }
|
||||
isMap(): boolean { return ValueType.MAP === this.valueType; }
|
||||
|
||||
boolValue(): boolean | null {
|
||||
if (this.isBool()) {
|
||||
return readInt(this.dataView, this.offset, this.parentWidth) > 0;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
intValue(): number | Long | bigint | null {
|
||||
if (this.valueType === ValueType.INT) {
|
||||
return readInt(this.dataView, this.offset, this.parentWidth);
|
||||
}
|
||||
if (this.valueType === ValueType.UINT) {
|
||||
return readUInt(this.dataView, this.offset, this.parentWidth);
|
||||
}
|
||||
if (this.valueType === ValueType.INDIRECT_INT) {
|
||||
return readInt(this.dataView, indirect(this.dataView, this.offset, this.parentWidth), fromByteWidth(this.byteWidth));
|
||||
}
|
||||
if (this.valueType === ValueType.INDIRECT_UINT) {
|
||||
return readUInt(this.dataView, indirect(this.dataView, this.offset, this.parentWidth), fromByteWidth(this.byteWidth));
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
floatValue(): number | null {
|
||||
if (this.valueType === ValueType.FLOAT) {
|
||||
return readFloat(this.dataView, this.offset, this.parentWidth);
|
||||
}
|
||||
if (this.valueType === ValueType.INDIRECT_FLOAT) {
|
||||
return readFloat(this.dataView, indirect(this.dataView, this.offset, this.parentWidth), fromByteWidth(this.byteWidth));
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
numericValue(): number | Long | bigint | null { return this.floatValue() || this.intValue()}
|
||||
|
||||
stringValue(): string | null {
|
||||
if (this.valueType === ValueType.STRING || this.valueType === ValueType.KEY) {
|
||||
const begin = indirect(this.dataView, this.offset, this.parentWidth);
|
||||
return fromUTF8Array(new Uint8Array(this.dataView.buffer, begin, this.length()));
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
blobValue(): Uint8Array | null {
|
||||
if (this.isBlob()) {
|
||||
const begin = indirect(this.dataView, this.offset, this.parentWidth);
|
||||
return new Uint8Array(this.dataView.buffer, begin, this.length());
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
get(key: number): Reference {
|
||||
const length = this.length();
|
||||
if (Number.isInteger(key) && isAVector(this.valueType)) {
|
||||
if (key >= length || key < 0) {
|
||||
throw `Key: [${key}] is not applicable on ${this.path} of ${this.valueType} length: ${length}`;
|
||||
}
|
||||
const _indirect = indirect(this.dataView, this.offset, this.parentWidth);
|
||||
const elementOffset = _indirect + key * this.byteWidth;
|
||||
let _packedType = this.dataView.getUint8(_indirect + length * this.byteWidth + key);
|
||||
if (isTypedVector(this.valueType)) {
|
||||
const _valueType = typedVectorElementType(this.valueType);
|
||||
_packedType = packedType(_valueType, BitWidth.WIDTH8);
|
||||
} else if (isFixedTypedVector(this.valueType)) {
|
||||
const _valueType = fixedTypedVectorElementType(this.valueType);
|
||||
_packedType = packedType(_valueType, BitWidth.WIDTH8);
|
||||
}
|
||||
return new Reference(this.dataView, elementOffset, fromByteWidth(this.byteWidth), _packedType, `${this.path}[${key}]`);
|
||||
}
|
||||
if (typeof key === 'string') {
|
||||
const index = keyIndex(key, this.dataView, this.offset, this.parentWidth, this.byteWidth, length);
|
||||
if (index !== null) {
|
||||
return valueForIndexWithKey(index, key, this.dataView, this.offset, this.parentWidth, this.byteWidth, length, this.path)
|
||||
}
|
||||
}
|
||||
throw `Key [${key}] is not applicable on ${this.path} of ${this.valueType}`;
|
||||
}
|
||||
|
||||
length(): number {
|
||||
let size;
|
||||
if (this._length > -1) {
|
||||
return this._length;
|
||||
}
|
||||
if (isFixedTypedVector(this.valueType)) {
|
||||
this._length = fixedTypedVectorElementSize(this.valueType);
|
||||
} else if (this.valueType === ValueType.BLOB
|
||||
|| this.valueType === ValueType.MAP
|
||||
|| isAVector(this.valueType)) {
|
||||
this._length = readUInt(this.dataView, indirect(this.dataView, this.offset, this.parentWidth) - this.byteWidth, fromByteWidth(this.byteWidth)) as number
|
||||
} else if (this.valueType === ValueType.NULL) {
|
||||
this._length = 0;
|
||||
} else if (this.valueType === ValueType.STRING) {
|
||||
const _indirect = indirect(this.dataView, this.offset, this.parentWidth);
|
||||
let sizeByteWidth = this.byteWidth;
|
||||
size = readUInt(this.dataView, _indirect - sizeByteWidth, fromByteWidth(this.byteWidth));
|
||||
while (this.dataView.getInt8(_indirect + (size as number)) !== 0) {
|
||||
sizeByteWidth <<= 1;
|
||||
size = readUInt(this.dataView, _indirect - sizeByteWidth, fromByteWidth(this.byteWidth));
|
||||
}
|
||||
this._length = size as number;
|
||||
} else if (this.valueType === ValueType.KEY) {
|
||||
const _indirect = indirect(this.dataView, this.offset, this.parentWidth);
|
||||
size = 1;
|
||||
while (this.dataView.getInt8(_indirect + size) !== 0) {
|
||||
size++;
|
||||
}
|
||||
this._length = size;
|
||||
} else {
|
||||
this._length = 1;
|
||||
}
|
||||
return this._length;
|
||||
}
|
||||
|
||||
toObject(): unknown {
|
||||
const length = this.length();
|
||||
if (this.isVector()) {
|
||||
const result = [];
|
||||
for (let i = 0; i < length; i++) {
|
||||
result.push(this.get(i).toObject());
|
||||
}
|
||||
return result;
|
||||
}
|
||||
if (this.isMap()) {
|
||||
const result: Record<string, unknown> = {};
|
||||
for (let i = 0; i < length; i++) {
|
||||
const key = keyForIndex(i, this.dataView, this.offset, this.parentWidth, this.byteWidth);
|
||||
result[key] = valueForIndexWithKey(i, key, this.dataView, this.offset, this.parentWidth, this.byteWidth, length, this.path).toObject();
|
||||
}
|
||||
return result;
|
||||
}
|
||||
if (this.isNull()) {
|
||||
return null;
|
||||
}
|
||||
if (this.isBool()) {
|
||||
return this.boolValue();
|
||||
}
|
||||
if (this.isNumber()) {
|
||||
return this.numericValue();
|
||||
}
|
||||
return this.blobValue() || this.stringValue();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,61 @@
|
|||
import { Builder } from './builder'
|
||||
import { BitWidth } from './bit-width'
|
||||
import { paddingSize, uwidth, fromByteWidth } from './bit-width-util'
|
||||
import { ValueType } from './value-type'
|
||||
import { isInline, packedType } from './value-type-util'
|
||||
|
||||
export class StackValue {
|
||||
constructor(private builder: Builder, public type: ValueType, public width: number, public value: number | boolean | null = null, public offset: number = 0) {
|
||||
|
||||
}
|
||||
|
||||
elementWidth(size: number, index: number): BitWidth {
|
||||
if (isInline(this.type)) return this.width;
|
||||
for (let i = 0; i < 4; i++) {
|
||||
const width = 1 << i;
|
||||
const offsetLoc = size + paddingSize(size, width) + index * width;
|
||||
const offset = offsetLoc - this.offset;
|
||||
const bitWidth = uwidth(offset);
|
||||
if (1 << bitWidth === width) {
|
||||
return bitWidth;
|
||||
}
|
||||
}
|
||||
throw `Element is unknown. Size: ${size} at index: ${index}. This might be a bug. Please create an issue https://github.com/google/flatbuffers/issues/new`;
|
||||
}
|
||||
|
||||
writeToBuffer(byteWidth: number): void {
|
||||
const newOffset = this.builder.computeOffset(byteWidth);
|
||||
if (this.type === ValueType.FLOAT) {
|
||||
if (this.width === BitWidth.WIDTH32) {
|
||||
this.builder.view.setFloat32(this.builder.offset, this.value as number, true);
|
||||
} else {
|
||||
this.builder.view.setFloat64(this.builder.offset, this.value as number, true);
|
||||
}
|
||||
} else if (this.type === ValueType.INT) {
|
||||
const bitWidth = fromByteWidth(byteWidth);
|
||||
this.builder.pushInt(this.value as number, bitWidth);
|
||||
} else if (this.type === ValueType.UINT) {
|
||||
const bitWidth = fromByteWidth(byteWidth);
|
||||
this.builder.pushUInt(this.value as number, bitWidth);
|
||||
} else if (this.type === ValueType.NULL) {
|
||||
this.builder.pushInt(0, this.width);
|
||||
} else if (this.type === ValueType.BOOL) {
|
||||
this.builder.pushInt(this.value ? 1 : 0, this.width);
|
||||
} else {
|
||||
throw `Unexpected type: ${this.type}. This might be a bug. Please create an issue https://github.com/google/flatbuffers/issues/new`
|
||||
}
|
||||
this.offset = newOffset;
|
||||
}
|
||||
|
||||
storedWidth(width = BitWidth.WIDTH8): BitWidth {
|
||||
return isInline(this.type) ? Math.max(width, this.width) : this.width;
|
||||
}
|
||||
|
||||
storedPackedType(width = BitWidth.WIDTH8): ValueType {
|
||||
return packedType(this.type, this.storedWidth(width));
|
||||
}
|
||||
|
||||
isOffset(): boolean {
|
||||
return !isInline(this.type)
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,64 @@
|
|||
import { ValueType } from './value-type'
|
||||
|
||||
export function isInline(value: ValueType): boolean {
|
||||
return value === ValueType.BOOL
|
||||
|| value <= ValueType.FLOAT;
|
||||
}
|
||||
|
||||
export function isNumber(value: ValueType): boolean {
|
||||
return value >= ValueType.INT
|
||||
&& value <= ValueType.FLOAT;
|
||||
}
|
||||
|
||||
export function isIndirectNumber(value: ValueType): boolean {
|
||||
return value >= ValueType.INDIRECT_INT
|
||||
&& value <= ValueType.INDIRECT_FLOAT;
|
||||
}
|
||||
|
||||
export function isTypedVectorElement(value: ValueType): boolean {
|
||||
return value === ValueType.BOOL
|
||||
|| (value >= ValueType.INT
|
||||
&& value <= ValueType.STRING);
|
||||
}
|
||||
|
||||
export function isTypedVector(value: ValueType): boolean {
|
||||
return value === ValueType.VECTOR_BOOL
|
||||
|| (value >= ValueType.VECTOR_INT
|
||||
&& value <= ValueType.VECTOR_STRING_DEPRECATED);
|
||||
}
|
||||
|
||||
export function isFixedTypedVector(value: ValueType): boolean {
|
||||
return value >= ValueType.VECTOR_INT2
|
||||
&& value <= ValueType.VECTOR_FLOAT4;
|
||||
}
|
||||
|
||||
export function isAVector(value: ValueType): boolean {
|
||||
return isTypedVector(value)
|
||||
|| isFixedTypedVector(value)
|
||||
|| value === ValueType.VECTOR;
|
||||
}
|
||||
|
||||
export function toTypedVector(valueType: ValueType, length: number): ValueType {
|
||||
if (length === 0) return valueType - ValueType.INT + ValueType.VECTOR_INT;
|
||||
if (length === 2) return valueType - ValueType.INT + ValueType.VECTOR_INT2;
|
||||
if (length === 3) return valueType - ValueType.INT + ValueType.VECTOR_INT3;
|
||||
if (length === 4) return valueType - ValueType.INT + ValueType.VECTOR_INT4;
|
||||
throw "Unexpected length " + length;
|
||||
}
|
||||
|
||||
export function typedVectorElementType(valueType: ValueType): ValueType {
|
||||
return valueType - ValueType.VECTOR_INT + ValueType.INT;
|
||||
}
|
||||
|
||||
export function fixedTypedVectorElementType(valueType: ValueType): ValueType {
|
||||
return ((valueType - ValueType.VECTOR_INT2) % 3) + ValueType.INT;
|
||||
}
|
||||
|
||||
export function fixedTypedVectorElementSize(valueType: ValueType): ValueType {
|
||||
// The x / y >> 0 trick is to have an int division. Suppose to be faster than Math.floor()
|
||||
return (((valueType - ValueType.VECTOR_INT2) / 3) >> 0) + 2;
|
||||
}
|
||||
|
||||
export function packedType(valueType: ValueType, bitWidth: number): ValueType {
|
||||
return bitWidth | (valueType << 2);
|
||||
}
|
||||
|
|
@ -0,0 +1,30 @@
|
|||
export enum ValueType {
|
||||
NULL = 0,
|
||||
INT = 1,
|
||||
UINT = 2,
|
||||
FLOAT = 3,
|
||||
KEY = 4,
|
||||
STRING = 5,
|
||||
INDIRECT_INT = 6,
|
||||
INDIRECT_UINT = 7,
|
||||
INDIRECT_FLOAT = 8,
|
||||
MAP = 9,
|
||||
VECTOR = 10,
|
||||
VECTOR_INT = 11,
|
||||
VECTOR_UINT = 12,
|
||||
VECTOR_FLOAT = 13,
|
||||
VECTOR_KEY = 14,
|
||||
VECTOR_STRING_DEPRECATED = 15,
|
||||
VECTOR_INT2 = 16,
|
||||
VECTOR_UINT2 = 17,
|
||||
VECTOR_FLOAT2 = 18,
|
||||
VECTOR_INT3 = 19,
|
||||
VECTOR_UINT3 = 20,
|
||||
VECTOR_FLOAT3 = 21,
|
||||
VECTOR_INT4 = 22,
|
||||
VECTOR_UINT4 = 23,
|
||||
VECTOR_FLOAT4 = 24,
|
||||
BLOB = 25,
|
||||
BOOL = 26,
|
||||
VECTOR_BOOL = 36,
|
||||
}
|
||||
|
|
@ -1,8 +1,8 @@
|
|||
{
|
||||
"compilerOptions": {
|
||||
"target": "es5",
|
||||
"target": "ES5",
|
||||
"module": "commonjs",
|
||||
"lib": ["es2015"],
|
||||
"lib": ["ES2015", "ES2020.BigInt", "DOM"],
|
||||
"declaration": true,
|
||||
"outDir": "./js",
|
||||
"strict": true,
|
||||
|
|
@ -11,6 +11,6 @@
|
|||
"forceConsistentCasingInFileNames": true
|
||||
},
|
||||
"include": [
|
||||
"ts/*.ts"
|
||||
"ts/**/*.ts"
|
||||
]
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
"compilerOptions": {
|
||||
"target": "ES2017",
|
||||
"module": "ES2015",
|
||||
"lib": ["ES2017"],
|
||||
"lib": ["ES2017", "ES2020.BigInt", "DOM"],
|
||||
"declaration": true,
|
||||
"outDir": "./mjs",
|
||||
"strict": true,
|
||||
|
|
@ -11,6 +11,6 @@
|
|||
"forceConsistentCasingInFileNames": true
|
||||
},
|
||||
"include": [
|
||||
"ts/*.ts"
|
||||
"ts/**/*.ts"
|
||||
]
|
||||
}
|
||||
Loading…
Reference in New Issue