rvx/dist/rvx.convert.js

A signal based rendering library

/*!
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
import { $, watchUpdates, teardown, map } from './rvx.js';

function debounce(source, delay) {
	const input = $(source.value, source);
	watchUpdates(input, value => {
		if (!Object.is(source.value, value)) {
			const timeout = setTimeout(() => { source.value = value; }, delay);
			teardown(() => clearTimeout(timeout));
		}
	});
	watchUpdates(source, value => {
		input.value = value;
	});
	return input;
}

function optionalString(input) {
	return map(input, value => {
		if (value === null || value === undefined) {
			return value;
		}
		return String(value);
	});
}

function separated(input, separator = " ") {
	return map(input, v => {
		if (Array.isArray(v)) {
			return v.join(separator);
		}
		return v;
	});
}

function string(input) {
	return map(input, String);
}

function trim(source) {
	const input = $(source.value, source);
	watchUpdates(input, value => {
		source.value = value.trim();
	});
	watchUpdates(source, value => {
		if (input.value.trim() !== value) {
			input.value = value;
		}
	});
	return input;
}

export { debounce, optionalString, separated, string, trim };