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BsonBinary,
BsonDbPointer,
BsonDecimal128,
BsonFloat,
BsonInt32,
BsonInt64,
BsonJavascriptCode,
BsonJavascriptCodeWithScope,
BsonMaxKey,
BsonMinKey,
BsonObjectId,
BsonSymbol,
BsonTimestamp,
} from '../bson/values';
import {toBase64Bin} from '@jsonjoy.com/base64/lib/toBase64Bin';
import {JsonEncoder} from '../json/JsonEncoder';
import type {IWriter, IWriterGrowable} from '@jsonjoy.com/buffers/lib';
export interface EjsonEncoderOptions {
/** Use canonical format (preserves all type information) or relaxed format (more readable) */
canonical?: boolean;
}
export class EjsonEncoder extends JsonEncoder {
constructor(
writer: IWriter & IWriterGrowable,
private options: EjsonEncoderOptions = {},
) {
super(writer);
}
/**
* Encode to string (for backward compatibility).
* This method maintains the previous API but uses the binary encoder internally.
*/
public encodeToString(value: unknown): string {
const bytes = this.encode(value);
return new TextDecoder().decode(bytes);
}
public writeUnknown(value: unknown): void {
this.writeNull();
}
public writeAny(value: unknown): void {
if (value === null || value === undefined) {
if (value === undefined) {
return this.writeUndefinedWrapper();
}
return this.writeNull();
}
if (typeof value === 'boolean') {
return this.writeBoolean(value);
}
if (typeof value === 'string') {
return this.writeStr(value);
}
if (typeof value === 'number') {
return this.writeNumberAsEjson(value);
}
if (Array.isArray(value)) {
return this.writeArr(value);
}
if (value instanceof Date) {
return this.writeDateAsEjson(value);
}
if (value instanceof RegExp) {
return this.writeRegExpAsEjson(value);
}
// Handle BSON value classes
if (value instanceof BsonObjectId) {
return this.writeObjectIdAsEjson(value);
}
if (value instanceof BsonInt32) {
return this.writeBsonInt32AsEjson(value);
}
if (value instanceof BsonInt64) {
return this.writeBsonInt64AsEjson(value);
}
if (value instanceof BsonFloat) {
return this.writeBsonFloatAsEjson(value);
}
if (value instanceof BsonDecimal128) {
return this.writeBsonDecimal128AsEjson(value);
}
if (value instanceof BsonBinary) {
return this.writeBsonBinaryAsEjson(value);
}
if (value instanceof BsonJavascriptCode) {
return this.writeBsonCodeAsEjson(value);
}
if (value instanceof BsonJavascriptCodeWithScope) {
return this.writeBsonCodeWScopeAsEjson(value);
}
if (value instanceof BsonSymbol) {
return this.writeBsonSymbolAsEjson(value);
}
if (value instanceof BsonTimestamp) {
return this.writeBsonTimestampAsEjson(value);
}
if (value instanceof BsonDbPointer) {
return this.writeBsonDbPointerAsEjson(value);
}
if (value instanceof BsonMinKey) {
return this.writeBsonMinKeyAsEjson();
}
if (value instanceof BsonMaxKey) {
return this.writeBsonMaxKeyAsEjson();
}
if (typeof value === 'object' && value !== null) {
return this.writeObj(value as Record<string, unknown>);
}
// Fallback for unknown types
return this.writeUnknown(value);
}
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,
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) {
let x = writer.x;
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.utf8(JSON.stringify(str));
return;
} else uint8[x++] = code;
}
uint8[x++] = 0x22; // "
writer.x = x;
return;
}
writer.utf8(JSON.stringify(str));
}
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 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; // }
}
// EJSON-specific type wrapper methods
private writeUndefinedWrapper(): void {
// Write {"$undefined":true}
const writer = this.writer;
writer.ensureCapacity(18);
writer.u8(0x7b); // {
writer.u32(0x2224756e);
writer.u32(0x64656669);
writer.u32(0x6e656422); // "$undefined"
writer.u8(0x3a); // :
writer.u32(0x74727565); // true
writer.u8(0x7d); // }
}
private writeNumberAsEjson(value: number): void {
if (this.options.canonical) {
if (Number.isInteger(value)) {
// Determine if it fits in Int32 or needs Int64
if (value >= -2147483648 && value <= 2147483647) {
this.writeNumberIntWrapper(value);
} else {
this.writeNumberLongWrapper(value);
}
} else {
this.writeNumberDoubleWrapper(value);
}
} else {
// Relaxed format
if (!Number.isFinite(value)) {
this.writeNumberDoubleWrapper(value);
} else {
this.writeNumber(value);
}
}
}
private writeNumberIntWrapper(value: number): void {
// Write {"$numberInt":"value"}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246e75);
writer.u32(0x6d626572);
writer.u32(0x496e7422); // "$numberInt"
writer.u8(0x3a); // :
this.writeStr(value + '');
writer.u8(0x7d); // }
}
private writeNumberLongWrapper(value: number): void {
// Write {"$numberLong":"value"}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246e75);
writer.u32(0x6d626572);
writer.u32(0x4c6f6e67);
writer.u16(0x223a); // "$numberLong":
this.writeStr(value + '');
writer.u8(0x7d); // }
}
private writeNumberDoubleWrapper(value: number): void {
// Write {"$numberDouble":"value"}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246e75);
writer.u32(0x6d626572);
writer.u32(0x446f7562);
writer.u16(0x6c65);
writer.u16(0x223a); // "$numberDouble":
if (!Number.isFinite(value)) {
this.writeStr(this.formatNonFinite(value));
} else {
this.writeStr(value + '');
}
writer.u8(0x7d); // }
}
private writeDateAsEjson(value: Date): void {
const timestamp = value.getTime();
// Check if date is valid
Iif (Number.isNaN(timestamp)) {
throw new Error('Invalid Date');
}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246461);
writer.u16(0x7465);
writer.u16(0x223a); // "$date":
if (this.options.canonical) {
// Write {"$numberLong":"timestamp"}
writer.u8(0x7b); // {
writer.u32(0x22246e75);
writer.u32(0x6d626572);
writer.u32(0x4c6f6e67);
writer.u16(0x223a); // "$numberLong":
this.writeStr(timestamp + '');
writer.u8(0x7d); // }
} else {
// Use ISO format for dates between 1970-9999 in relaxed mode
const year = value.getFullYear();
if (year >= 1970 && year <= 9999) {
this.writeStr(value.toISOString());
} else {
// Write {"$numberLong":"timestamp"}
writer.u8(0x7b); // {
writer.u32(0x22246e75);
writer.u32(0x6d626572);
writer.u32(0x4c6f6e67);
writer.u16(0x223a); // "$numberLong":
this.writeStr(timestamp + '');
writer.u8(0x7d); // }
}
}
writer.u8(0x7d); // }
}
private writeRegExpAsEjson(value: RegExp): void {
// Write {"$regularExpression":{"pattern":"...","options":"..."}}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22247265);
writer.u32(0x67756c61);
writer.u32(0x72457870);
writer.u32(0x72657373);
writer.u32(0x696f6e22); // "$regularExpression"
writer.u16(0x3a7b); // :{
writer.u32(0x22706174);
writer.u32(0x7465726e);
writer.u16(0x223a); // "pattern":
this.writeStr(value.source);
writer.u8(0x2c); // ,
writer.u32(0x226f7074);
writer.u32(0x696f6e73);
writer.u16(0x223a); // "options":
this.writeStr(value.flags);
writer.u16(0x7d7d); // }}
}
private writeObjectIdAsEjson(value: BsonObjectId): void {
// Write {"$oid":"hexstring"}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246f69);
writer.u16(0x6422); // "$oid"
writer.u8(0x3a); // :
this.writeStr(this.objectIdToHex(value));
writer.u8(0x7d); // }
}
private writeBsonInt32AsEjson(value: BsonInt32): void {
if (this.options.canonical) {
this.writeNumberIntWrapper(value.value);
} else {
this.writeNumber(value.value);
}
}
private writeBsonInt64AsEjson(value: BsonInt64): void {
if (this.options.canonical) {
this.writeNumberLongWrapper(value.value);
} else {
this.writeNumber(value.value);
}
}
private writeBsonFloatAsEjson(value: BsonFloat): void {
if (this.options.canonical) {
this.writeNumberDoubleWrapper(value.value);
} else {
Iif (!Number.isFinite(value.value)) {
this.writeNumberDoubleWrapper(value.value);
} else {
this.writeNumber(value.value);
}
}
}
private writeBsonDecimal128AsEjson(value: BsonDecimal128): void {
// Write {"$numberDecimal":"..."}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246e75);
writer.u32(0x6d626572);
writer.u32(0x44656369);
writer.u32(0x6d616c22); // "$numberDecimal"
writer.u8(0x3a); // :
this.writeStr(this.decimal128ToString(value.data));
writer.u8(0x7d); // }
}
private writeBsonBinaryAsEjson(value: BsonBinary): void {
// Write {"$binary":{"base64":"...","subType":"..."}}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246269);
writer.u32(0x6e617279);
writer.u16(0x223a); // "$binary":
writer.u8(0x7b); // {
writer.u32(0x22626173);
writer.u32(0x65363422); // "base64"
writer.u8(0x3a); // :
this.writeStr(this.uint8ArrayToBase64(value.data));
writer.u8(0x2c); // ,
writer.u32(0x22737562);
writer.u32(0x54797065);
writer.u16(0x223a); // "subType":
this.writeStr(value.subtype.toString(16).padStart(2, '0'));
writer.u16(0x7d7d); // }}
}
private writeBsonCodeAsEjson(value: BsonJavascriptCode): void {
// Write {"$code":"..."}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x2224636f);
writer.u16(0x6465);
writer.u16(0x223a); // "$code":
this.writeStr(value.code);
writer.u8(0x7d); // }
}
private writeBsonCodeWScopeAsEjson(value: BsonJavascriptCodeWithScope): void {
// Write {"$code":"...","$scope":{...}}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x2224636f);
writer.u16(0x6465);
writer.u16(0x223a); // "$code":
this.writeStr(value.code);
writer.u8(0x2c); // ,
writer.u32(0x22247363);
writer.u32(0x6f706522); // "$scope"
writer.u8(0x3a); // :
this.writeAny(value.scope);
writer.u8(0x7d); // }
}
private writeBsonSymbolAsEjson(value: BsonSymbol): void {
// Write {"$symbol":"..."}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22247379);
writer.u32(0x6d626f6c);
writer.u16(0x223a); // "$symbol":
this.writeStr(value.symbol);
writer.u8(0x7d); // }
}
private writeBsonTimestampAsEjson(value: BsonTimestamp): void {
// Write {"$timestamp":{"t":...,"i":...}}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22247469);
writer.u32(0x6d657374);
writer.u32(0x616d7022); // "$timestamp"
writer.u16(0x3a7b); // :{
writer.u16(0x2274);
writer.u16(0x223a); // "t":
this.writeNumber(value.timestamp);
writer.u8(0x2c); // ,
writer.u16(0x2269);
writer.u16(0x223a); // "i":
this.writeNumber(value.increment);
writer.u16(0x7d7d); // }}
}
private writeBsonDbPointerAsEjson(value: BsonDbPointer): void {
// Write {"$dbPointer":{"$ref":"...","$id":{...}}}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246462);
writer.u32(0x506f696e);
writer.u32(0x74657222); // "$dbPointer"
writer.u16(0x3a7b); // :{
writer.u32(0x22247265);
writer.u16(0x6622); // "$ref"
writer.u8(0x3a); // :
this.writeStr(value.name);
writer.u8(0x2c); // ,
writer.u32(0x22246964);
writer.u16(0x223a); // "$id":
this.writeAny(value.id);
writer.u16(0x7d7d); // }}
}
private writeBsonMinKeyAsEjson(): void {
// Write {"$minKey":1}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246d69);
writer.u32(0x6e4b6579);
writer.u16(0x223a); // "$minKey":
this.writeNumber(1);
writer.u8(0x7d); // }
}
private writeBsonMaxKeyAsEjson(): void {
// Write {"$maxKey":1}
const writer = this.writer;
writer.u8(0x7b); // {
writer.u32(0x22246d61);
writer.u32(0x784b6579);
writer.u16(0x223a); // "$maxKey":
this.writeNumber(1);
writer.u8(0x7d); // }
}
// Utility methods
private formatNonFinite(value: number): string {
if (value === Infinity) return 'Infinity';
if (value === -Infinity) return '-Infinity';
return 'NaN';
}
private objectIdToHex(objectId: BsonObjectId): string {
// Convert ObjectId components to 24-character hex string
const timestamp = objectId.timestamp.toString(16).padStart(8, '0');
const process = objectId.process.toString(16).padStart(10, '0');
const counter = objectId.counter.toString(16).padStart(6, '0');
return timestamp + process + counter;
}
private uint8ArrayToBase64(data: Uint8Array): string {
// Convert Uint8Array to base64 string
let binary = '';
for (let i = 0; i < data.length; i++) {
binary += String.fromCharCode(data[i]);
}
return btoa(binary);
}
private decimal128ToString(data: Uint8Array): string {
// This is a simplified implementation
// In a real implementation, you'd need to parse the IEEE 754-2008 decimal128 format
// For now, return a placeholder that indicates the format
return '0'; // TODO: Implement proper decimal128 to string conversion
}
}
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