settable-by.ts
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settable-by.ts
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	import Field, { HybridField } from "../../../chip-types/field";
	import type { Context } from "../../../main";
	import type Policy from "../../../chip-types/policy";

	export default class SettableBy<T extends Field> extends HybridField<T> {
	typeName = "settable-by";
	policy: Policy;

	constructor(base_field: T, policy: Policy) {
	super(base_field);
	this.policy = policy;
	}

	async isProperValue(
	context: Context,
	input: Parameters<T["encode"]>[1],
	old_value: Parameters<T["encode"]>[2]
	) {
	const result = await this.policy.check(context);
	if (result && !result.allowed) {
	return Field.invalid(result.reason);
	}
	return this.virtual_field.checkValue(context, input, old_value, null);
	}
	}