class InstructionEncoder {
    constructor(buffer) {
        this.buffer = buffer;
        this.typePos = 0;
        this.size = 0;
    }
    encode(type, machine) {
        if (type > 255 /* TYPE_SIZE */) {
                throw new Error(`Opcode type over 8-bits. Got ${type}.`);
            }
        this.buffer.push(type | machine | arguments.length - 2 << 8 /* ARG_SHIFT */);
        this.typePos = this.buffer.length - 1;
        for (let i = 2; i < arguments.length; i++) {
            let op = arguments[i];
            if (typeof op === 'number' && op > 65535 /* MAX_SIZE */) {
                    throw new Error(`Operand over 16-bits. Got ${op}.`);
                }
            this.buffer.push(op);
        }
        this.size = this.buffer.length;
    }
    patch(position, target) {
        if (this.buffer[position + 1] === -1) {
            this.buffer[position + 1] = target;
        } else {
            throw new Error('Trying to patch operand in populated slot instead of a reserved slot.');
        }
    }
    patchWith(position, target, operand) {
        if (this.buffer[position + 1] === -1) {
            this.buffer[position + 1] = target;
            this.buffer[position + 2] = operand;
        } else {
            throw new Error('Trying to patch operand in populated slot instead of a reserved slot.');
        }
    }
}

export { InstructionEncoder };