@eyhn/msgpack-stream/dist.es2015+esm/ExtensionCodec.mjs

MessagePack for ECMA-262/JavaScript/TypeScript

// ExtensionCodec to handle MessagePack extensions
import { ExtData } from "./ExtData.mjs";
import { timestampExtension } from "./timestamp.mjs";
export class ExtensionCodec {
    constructor() {
        // built-in extensions
        this.builtInEncoders = [];
        this.builtInDecoders = [];
        // custom extensions
        this.encoders = [];
        this.decoders = [];
        this.register(timestampExtension);
    }
    register({ type, encode, decode, }) {
        if (type >= 0) {
            // custom extensions
            this.encoders[type] = encode;
            this.decoders[type] = decode;
        }
        else {
            // built-in extensions
            const index = 1 + type;
            this.builtInEncoders[index] = encode;
            this.builtInDecoders[index] = decode;
        }
    }
    tryToEncode(object, context) {
        // built-in extensions
        for (let i = 0; i < this.builtInEncoders.length; i++) {
            const encodeExt = this.builtInEncoders[i];
            if (encodeExt != null) {
                const data = encodeExt(object, context);
                if (data != null) {
                    const type = -1 - i;
                    return new ExtData(type, data);
                }
            }
        }
        // custom extensions
        for (let i = 0; i < this.encoders.length; i++) {
            const encodeExt = this.encoders[i];
            if (encodeExt != null) {
                const data = encodeExt(object, context);
                if (data != null) {
                    const type = i;
                    return new ExtData(type, data);
                }
            }
        }
        if (object instanceof ExtData) {
            // to keep ExtData as is
            return object;
        }
        return null;
    }
    decode(data, type, context) {
        const decodeExt = type < 0 ? this.builtInDecoders[-1 - type] : this.decoders[type];
        if (decodeExt) {
            return decodeExt(data, type, context);
        }
        else {
            // decode() does not fail, returns ExtData instead.
            return new ExtData(type, data);
        }
    }
}
ExtensionCodec.defaultCodec = new ExtensionCodec();
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