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import type {BinaryJsonEncoder, StreamingBinaryJsonEncoder} from '../types';
export class UbjsonEncoder implements BinaryJsonEncoder, StreamingBinaryJsonEncoder {
constructor(public readonly writer: IWriter & IWriterGrowable) {}
public encode(value: unknown): Uint8Array {
const writer = this.writer;
writer.reset();
this.writeAny(value);
return writer.flush();
}
public writeAny(value: unknown): void {
switch (typeof value) {
case 'boolean':
return this.writeBoolean(value);
case 'number':
return this.writeNumber(value as number);
case 'string':
return this.writeStr(value);
case 'object': {
if (value === null) return this.writeNull();
const construct = value.constructor;
switch (construct) {
case Array:
return this.writeArr(value as unknown[]);
case Uint8Array:
return this.writeBin(value as Uint8Array);
default:
return this.writeObj(value as Record<string, unknown>);
}
}
case 'bigint':
return this.writeBigInt(value as bigint);
case 'undefined':
return this.writeUndef();
default:
return this.writeNull();
}
}
public writeNull(): void {
this.writer.u8(0x5a);
}
public writeUndef(): void {
this.writer.u8(0x4e);
}
public writeBoolean(bool: boolean): void {
this.writer.u8(bool ? 0x54 : 0x46);
}
public writeNumber(num: number): void {
if (num >> 0 === num) return this.writeInteger(num);
this.writeFloat(num);
}
public writeInteger(int: number): void {
const writer = this.writer;
if (int <= 0xff && 0 <= int) writer.u16(0x5500 | int);
else if (int <= 127 && -128 <= int) {
writer.u16(0x6900);
writer.view.setInt8(writer.x - 1, int);
} else if (int <= 32767 && -32768 <= int) {
writer.ensureCapacity(3);
writer.u8(0x49);
writer.view.setInt16(writer.x, int, false);
writer.x += 2;
} else if (int <= 2147483647 && -2147483648 <= int) {
writer.ensureCapacity(5);
writer.u8(0x6c);
writer.view.setInt32(writer.x, int, false);
writer.x += 4;
}
}
public writeUInteger(uint: number): void {
const writer = this.writer;
Iif (uint < 0xff) writer.u16(0x5500 + uint);
}
public writeFloat(float: number): void {
const writer = this.writer;
writer.ensureCapacity(9);
const view = writer.view;
const x = writer.x;
view.setUint8(x, 0x44);
view.setFloat64(x + 1, float, false);
writer.x = x + 9;
}
public writeBigInt(int: bigint): void {
const writer = this.writer;
writer.ensureCapacity(9);
const view = writer.view;
const x = writer.x;
view.setUint8(x, 0x4c);
view.setBigInt64(x + 1, int, false);
writer.x = x + 9;
}
public writeBin(buf: Uint8Array): void {
const writer = this.writer;
const length = buf.length;
writer.u32(0x5b_24_55_23); // "[$U#"
this.writeInteger(length);
writer.buf(buf, length);
}
public writeStr(str: string): void {
const length = str.length;
const maxLength = length * 4;
const capacity = maxLength + 1 + 5; // 1 for string type, 5 for length.
const writer = this.writer;
writer.ensureCapacity(capacity);
const uint8 = writer.uint8;
uint8[writer.x++] = 0x53;
const x = writer.x;
const oneByteLength = maxLength < 0xff;
if (oneByteLength) {
uint8[writer.x++] = 0x55;
writer.x++;
} else {
uint8[writer.x++] = 0x6c;
writer.x += 4;
}
const size = writer.utf8(str);
if (oneByteLength) uint8[x + 1] = size;
else writer.view.setUint32(x + 1, size);
}
public writeAsciiStr(str: string): void {
this.writeStr(str);
}
public writeArr(arr: unknown[]): void {
const writer = this.writer;
writer.u8(0x5b);
const length = arr.length;
for (let i = 0; i < length; i++) this.writeAny(arr[i]);
writer.u8(0x5d);
}
public writeObj(obj: Record<string, unknown>): void {
const writer = this.writer;
const keys = Object.keys(obj);
const length = keys.length;
writer.u8(0x7b);
for (let i = 0; i < length; i++) {
const key = keys[i];
const value = obj[key];
this.writeKey(key);
this.writeAny(value);
}
writer.u8(0x7d);
}
public writeKey(str: string): void {
const length = str.length;
const maxLength = length * 4;
const capacity = maxLength + 5; // 5 for int.
const writer = this.writer;
writer.ensureCapacity(capacity);
const uint8 = writer.uint8;
const x = writer.x;
const oneByteLength = maxLength < 0xff;
if (oneByteLength) {
uint8[writer.x++] = 0x55;
writer.x++;
} else {
uint8[writer.x++] = 0x6c;
writer.x += 4;
}
const size = writer.utf8(str);
if (oneByteLength) uint8[x + 1] = size;
else writer.view.setUint32(x + 1, size);
}
// ------------------------------------------------------- Streaming encoding
public writeStartStr(): void {
throw new Error('Method not implemented.');
}
public writeStrChunk(str: string): void {
throw new Error('Method not implemented.');
}
public writeEndStr(): void {
throw new Error('Method not implemented.');
}
public writeStartBin(): void {
throw new Error('Method not implemented.');
}
public writeBinChunk(buf: Uint8Array): void {
throw new Error('Method not implemented.');
}
public writeEndBin(): void {
throw new Error('Method not implemented.');
}
public writeStartArr(): void {
this.writer.u8(0x5b);
}
public writeArrChunk(item: unknown): void {
this.writeAny(item);
}
public writeEndArr(): void {
this.writer.u8(0x5d);
}
public writeStartObj(): void {
this.writer.u8(0x7b);
}
public writeObjChunk(key: string, value: unknown): void {
this.writeKey(key);
this.writeAny(value);
}
public writeEndObj(): void {
this.writer.u8(0x7d);
}
}
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