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import type {IWriter, IWriterGrowable} from '@jsonjoy.com/buffers/lib';
import type {BinaryJsonEncoder, StreamingBinaryJsonEncoder} from '../types';
export class JsonEncoder 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();
}
/**
* Called when the encoder encounters a value that it does not know how to encode.
*
* @param value Some JavaScript value.
*/
public writeUnknown(value: unknown): void {
this.writeNull();
}
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 constr = value.constructor;
switch (constr) {
case Object:
return this.writeObj(value as Record<string, unknown>);
case Array:
return this.writeArr(value as unknown[]);
case Uint8Array:
return this.writeBin(value as Uint8Array);
default:
if (value instanceof Uint8Array) return this.writeBin(value);
Iif (Array.isArray(value)) return this.writeArr(value);
return this.writeUnknown(value);
}
}
case 'undefined': {
return this.writeUndef();
}
default:
return this.writeUnknown(value);
}
}
public writeNull(): void {
this.writer.u32(0x6e756c6c); // null
}
public writeUndef(): void {
const writer = this.writer;
const length = 35;
writer.ensureCapacity(length);
// Write: "data:application/cbor,base64;9w=="
const view = writer.view;
let x = writer.x;
view.setUint32(x, 0x22_64_61_74); // "dat
x += 4;
view.setUint32(x, 0x61_3a_61_70); // a:ap
x += 4;
view.setUint32(x, 0x70_6c_69_63); // plic
x += 4;
view.setUint32(x, 0x61_74_69_6f); // atio
x += 4;
view.setUint32(x, 0x6e_2f_63_62); // n/cb
x += 4;
view.setUint32(x, 0x6f_72_2c_62); // or,b
x += 4;
view.setUint32(x, 0x61_73_65_36); // ase6
x += 4;
view.setUint32(x, 0x34_3b_39_77); // 4;9w
x += 4;
view.setUint16(x, 0x3d_3d); // ==
x += 2;
writer.uint8[x++] = 0x22; // "
writer.x = x;
}
public writeBoolean(bool: boolean): void {
if (bool)
this.writer.u32(0x74727565); // true
else this.writer.u8u32(0x66, 0x616c7365); // false
}
public writeNumber(num: number): void {
const str = num.toString();
this.writer.ascii(str);
}
public writeInteger(int: number): void {
this.writeNumber(int >> 0 === int ? int : Math.trunc(int));
}
public writeUInteger(uint: number): void {
this.writeInteger(uint < 0 ? -uint : uint);
}
public writeFloat(float: number): void {
this.writeNumber(float);
}
public writeBin(buf: Uint8Array): void {
const writer = this.writer;
const length = buf.length;
writer.ensureCapacity(38 + 3 + (length << 1));
// Write: "data:application/octet-stream;base64, - 22 64 61 74 61 3a 61 70 70 6c 69 63 61 74 69 6f 6e 2f 6f 63 74 65 74 2d 73 74 72 65 61 6d 3b 62 61 73 65 36 34 2c
const view = writer.view;
let x = writer.x;
view.setUint32(x, 0x22_64_61_74); // "dat
x += 4;
view.setUint32(x, 0x61_3a_61_70); // a:ap
x += 4;
view.setUint32(x, 0x70_6c_69_63); // plic
x += 4;
view.setUint32(x, 0x61_74_69_6f); // atio
x += 4;
view.setUint32(x, 0x6e_2f_6f_63); // n/oc
x += 4;
view.setUint32(x, 0x74_65_74_2d); // tet-
x += 4;
view.setUint32(x, 0x73_74_72_65); // stre
x += 4;
view.setUint32(x, 0x61_6d_3b_62); // am;b
x += 4;
view.setUint32(x, 0x61_73_65_36); // ase6
x += 4;
view.setUint16(x, 0x34_2c); // 4,
x += 2;
x = toBase64Bin(buf, 0, length, view, x);
writer.uint8[x++] = 0x22; // "
writer.x = x;
}
public writeStr(str: string): void {
const writer = this.writer;
const length = str.length;
writer.ensureCapacity(length * 4 + 2);
if (length < 256) {
const startX = writer.x;
let x = startX;
const uint8 = writer.uint8;
uint8[x++] = 0x22; // "
for (let i = 0; i < length; i++) {
const code = str.charCodeAt(i);
switch (code) {
case 34: // "
case 92: // \
uint8[x++] = 0x5c; // \
break;
}
if (code < 32 || code > 126) {
writer.x = startX;
const jsonStr = JSON.stringify(str);
writer.ensureCapacity(jsonStr.length * 4 + 4);
writer.utf8(jsonStr);
return;
} else uint8[x++] = code;
}
uint8[x++] = 0x22; // "
writer.x = x;
return;
}
const jsonStr = JSON.stringify(str);
writer.ensureCapacity(jsonStr.length * 4 + 4);
writer.utf8(jsonStr);
}
public writeAsciiStr(str: string): void {
const length = str.length;
const writer = this.writer;
writer.ensureCapacity(length * 2 + 2);
const uint8 = writer.uint8;
let x = writer.x;
uint8[x++] = 0x22; // "
for (let i = 0; i < length; i++) {
const code = str.charCodeAt(i);
switch (code) {
case 34: // "
case 92: // \
uint8[x++] = 0x5c; // \
break;
}
uint8[x++] = code;
}
uint8[x++] = 0x22; // "
writer.x = x;
}
public writeArr(arr: unknown[]): void {
const writer = this.writer;
writer.u8(0x5b); // [
const length = arr.length;
const last = length - 1;
for (let i = 0; i < last; i++) {
this.writeAny(arr[i]);
writer.u8(0x2c); // ,
}
if (last >= 0) this.writeAny(arr[last]);
writer.u8(0x5d); // ]
}
public writeArrSeparator(): void {
this.writer.u8(0x2c); // ,
}
public writeObj(obj: Record<string, unknown>): void {
const writer = this.writer;
const keys = Object.keys(obj);
const length = keys.length;
if (!length) return writer.u16(0x7b7d); // {}
writer.u8(0x7b); // {
for (let i = 0; i < length; i++) {
const key = keys[i];
const value = obj[key];
this.writeStr(key);
writer.u8(0x3a); // :
this.writeAny(value);
writer.u8(0x2c); // ,
}
writer.uint8[writer.x - 1] = 0x7d; // }
}
public writeObjSeparator(): void {
this.writer.u8(0x2c); // ,
}
public writeObjKeySeparator(): void {
this.writer.u8(0x3a); // :
}
// ------------------------------------------------------- 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 {
throw new Error('Method not implemented.');
}
public writeEndArr(): void {
this.writer.u8(0x5d); // ]
}
public writeStartObj(): void {
this.writer.u8(0x7b); // {
}
public writeObjChunk(key: string, value: unknown): void {
throw new Error('Method not implemented.');
}
public writeEndObj(): void {
this.writer.u8(0x7d); // }
}
}
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