src/vs/editor/common/services/semanticTokensDto.ts
152 LOC · 133 covered · 19 uncovered · 18 ranges · 5 concepts · 5 introducers · 4 tests
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/*---------------------------------------------------------------------------------------------
semanticTokensDto.ts ×9
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { VSBuffer } from '../../../base/common/buffer.js';
import * as platform from '../../../base/common/platform.js';
export interface IFullSemanticTokensDto {
id: number;
type: 'full';
data: Uint32Array;
}
export interface IDeltaSemanticTokensDto {
id: number;
type: 'delta';
deltas: { start: number; deleteCount: number; data?: Uint32Array }[];
}
export type ISemanticTokensDto = IFullSemanticTokensDto | IDeltaSemanticTokensDto;
const enum EncodedSemanticTokensType {
Full = 1,
Delta = 2
}
function reverseEndianness(arr: Uint8Array): void {
for (let i = 0, len = arr.length; i < len; i += 4) {
// flip bytes 0<->3 and 1<->2
const b0 = arr[i + 0];
const b1 = arr[i + 1];
const b2 = arr[i + 2];
const b3 = arr[i + 3];
arr[i + 0] = b3;
arr[i + 1] = b2;
arr[i + 2] = b1;
arr[i + 3] = b0;
}
}
function toLittleEndianBuffer(arr: Uint32Array): VSBuffer {
const uint8Arr = new Uint8Array(arr.buffer, arr.byteOffset, arr.length * 4);
if (!platform.isLittleEndian()) {
// the byte order must be changed
reverseEndianness(uint8Arr);
}
}
function fromLittleEndianBuffer(buff: VSBuffer): Uint32Array {
const uint8Arr = buff.buffer;
if (!platform.isLittleEndian()) {
// the byte order must be changed
reverseEndianness(uint8Arr);
}
return new Uint32Array(uint8Arr.buffer, uint8Arr.byteOffset, uint8Arr.length / 4);
} else {
const data = new Uint8Array(uint8Arr.byteLength);
data.set(uint8Arr);
return new Uint32Array(data.buffer, data.byteOffset, data.length / 4);
}
export function encodeSemanticTokensDto(semanticTokens: ISemanticTokensDto): VSBuffer {
const dest = new Uint32Array(encodeSemanticTokensDtoSize(semanticTokens));
let offset = 0;
dest[offset++] = semanticTokens.id;
if (semanticTokens.type === 'full') {
dest[offset++] = semanticTokens.data.length;
dest.set(semanticTokens.data, offset); offset += semanticTokens.data.length;
dest[offset++] = semanticTokens.deltas.length;
for (const delta of semanticTokens.deltas) {
dest[offset++] = delta.start;
dest[offset++] = delta.deleteCount;
if (delta.data) {
dest[offset++] = delta.data.length;
dest.set(delta.data, offset); offset += delta.data.length;
} else {
}
}
}
function encodeSemanticTokensDtoSize(semanticTokens: ISemanticTokensDto): number {
let result = 0;
result += (
+ 1 // id
+ 1 // type
);
if (semanticTokens.type === 'full') {
+ 1 // data length
+ semanticTokens.data.length
);
+ 1 // delta count
);
result += (
+ 1 // start
+ 1 // deleteCount
+ 1 // data length
) * semanticTokens.deltas.length;
for (const delta of semanticTokens.deltas) {
if (delta.data) {
result += delta.data.length;
}
}
}
}
export function decodeSemanticTokensDto(_buff: VSBuffer): ISemanticTokensDto {
const src = fromLittleEndianBuffer(_buff);
let offset = 0;
const id = src[offset++];
const type: EncodedSemanticTokensType = src[offset++];
if (type === EncodedSemanticTokensType.Full) {
const data = src.subarray(offset, offset + length); offset += length;
return {
id: id,
type: 'full',
data: data
};
}
const deltas: { start: number; deleteCount: number; data?: Uint32Array }[] = [];
for (let i = 0; i < deltaCount; i++) {
const start = src[offset++];
const deleteCount = src[offset++];
const length = src[offset++];
let data: Uint32Array | undefined;
if (length > 0) {
data = src.subarray(offset, offset + length); offset += length;
}
deltas[i] = { start, deleteCount, data };
}
return {
id: id,
type: 'delta',
deltas: deltas
};
}