boolean.ts
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boolean.ts
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	import { is, predicates } from "@sealcode/ts-predicates";
	import { Context } from "koa";
	import { FormDataValue } from "../form-types.js";
	import { FieldParseResult, FormField } from "./field.js";

	const truthy = ["true", "on", "yes", "1"];
	const falsy = ["false", "off", "no", "0"];

	export class Boolean<Required extends boolean> extends FormField<
	Required,
	boolean
	> {
	predicate = predicates.boolean;
	constructor(required: Required, public error_message: string = "") {
	super(required);
	}

	public async isValueValid(
	_: Context,
	value: boolean
	): Promise<{ valid: boolean; message: string }> {
	if (this.required && !value) {
	return { valid: false, message: this.error_message };
	}
	return { valid: true, message: "" };
	}

	async parse(
	_: Context,
	value: FormDataValue
	): Promise<FieldParseResult<boolean>> {
	if (is(value, predicates.boolean)) {
	return { parsable: true, parsed_value: value, error: null };
	} else if (
	is(value, predicates.string) &&
	[...truthy, ...falsy].includes(value)
	) {
	return {
	parsable: true,
	parsed_value: truthy.includes(value),
	error: null,
	};
	} else if (is(value, predicates.undefined)) {
	return {
	parsable: true,
	parsed_value: false,
	error: null,
	};
	} else if (value === null) {
	return { parsable: true, parsed_value: false, error: null };
	} else {
	return {
	parsable: false,
	parsed_value: null,
	error: "Please enter a boolean",
	};
	}
	}

	public getEmptyValue(): boolean {
	return false;
	}
	}