dom.js

export function append(target, node) {
	target.appendChild(node);
}

export function insert(target, node, anchor) {
	target.insertBefore(node, anchor);
}

export function detach(node) {
	node.parentNode.removeChild(node);
}

export function detach_between(before, after) {
	while (before.nextSibling && before.nextSibling !== after) {
		before.parentNode.removeChild(before.nextSibling);
	}
}

export function detach_before(after) {
	while (after.previousSibling) {
		after.parentNode.removeChild(after.previousSibling);
	}
}

export function detach_after(before) {
	while (before.nextSibling) {
		before.parentNode.removeChild(before.nextSibling);
	}
}

export function destroy_each(iterations, detaching) {
	for (let i = 0; i < iterations.length; i += 1) {
		if (iterations[i]) iterations[i].d(detaching);
	}
}

export function element(name) {
	return document.createElement(name);
}

export function svg_element(name) {
	return document.createElementNS('http://www.w3.org/2000/svg', name);
}

export function text(data) {
	return document.createTextNode(data);
}

export function space() {
	return text(' ');
}

export function empty() {
	return text('');
}

export function listen(node, event, handler, options) {
	node.addEventListener(event, handler, options);
	return () => node.removeEventListener(event, handler, options);
}

export function prevent_default(fn) {
	return function(event) {
		event.preventDefault();
		return fn.call(this, event);
	};
}

export function stop_propagation(fn) {
	return function(event) {
		event.stopPropagation();
		return fn.call(this, event);
	};
}

export function attr(node, attribute, value) {
	if (value == null) node.removeAttribute(attribute);
	else node.setAttribute(attribute, value);
}

export function set_attributes(node, attributes) {
	for (const key in attributes) {
		if (key === 'style') {
			node.style.cssText = attributes[key];
		} else if (key in node) {
			node[key] = attributes[key];
		} else {
			attr(node, key, attributes[key]);
		}
	}
}

export function set_custom_element_data(node, prop, value) {
	if (prop in node) {
		node[prop] = value;
	} else {
		attr(node, prop, value);
	}
}

export function xlink_attr(node, attribute, value) {
	node.setAttributeNS('http://www.w3.org/1999/xlink', attribute, value);
}

export function get_binding_group_value(group) {
	const value = [];
	for (let i = 0; i < group.length; i += 1) {
		if (group[i].checked) value.push(group[i].__value);
	}
	return value;
}

export function to_number(value) {
	return value === '' ? undefined : +value;
}

export function time_ranges_to_array(ranges) {
	const array = [];
	for (let i = 0; i < ranges.length; i += 1) {
		array.push({ start: ranges.start(i), end: ranges.end(i) });
	}
	return array;
}

export function children(element) {
	return Array.from(element.childNodes);
}

export function claim_element(nodes, name, attributes, svg) {
	for (let i = 0; i < nodes.length; i += 1) {
		const node = nodes[i];
		if (node.nodeName === name) {
			for (let j = 0; j < node.attributes.length; j += 1) {
				const attribute = node.attributes[j];
				if (!attributes[attribute.name]) node.removeAttribute(attribute.name);
			}
			return nodes.splice(i, 1)[0]; // TODO strip unwanted attributes
		}
	}

	return svg ? svg_element(name) : element(name);
}

export function claim_text(nodes, data) {
	for (let i = 0; i < nodes.length; i += 1) {
		const node = nodes[i];
		if (node.nodeType === 3) {
			node.data = data;
			return nodes.splice(i, 1)[0];
		}
	}

	return text(data);
}

export function set_data(text, data) {
	data = '' + data;
	if (text.data !== data) text.data = data;
}

export function set_input_type(input, type) {
	try {
		input.type = type;
	} catch (e) {
		// do nothing
	}
}

export function set_style(node, key, value) {
	node.style.setProperty(key, value);
}

export function select_option(select, value) {
	for (let i = 0; i < select.options.length; i += 1) {
		const option = select.options[i];

		if (option.__value === value) {
			option.selected = true;
			return;
		}
	}
}

export function select_options(select, value) {
	for (let i = 0; i < select.options.length; i += 1) {
		const option = select.options[i];
		option.selected = ~value.indexOf(option.__value);
	}
}

export function select_value(select) {
	const selected_option = select.querySelector(':checked') || select.options[0];
	return selected_option && selected_option.__value;
}

export function select_multiple_value(select) {
	return [].map.call(select.querySelectorAll(':checked'), option => option.__value);
}

export function add_resize_listener(element, fn) {
	if (getComputedStyle(element).position === 'static') {
		element.style.position = 'relative';
	}

	const object = document.createElement('object');
	object.setAttribute('style', 'display: block; position: absolute; top: 0; left: 0; height: 100%; width: 100%; overflow: hidden; pointer-events: none; z-index: -1;');
	object.type = 'text/html';

	let win;

	object.onload = () => {
		win = object.contentDocument.defaultView;
		win.addEventListener('resize', fn);
	};

	if (/Trident/.test(navigator.userAgent)) {
		element.appendChild(object);
		object.data = 'about:blank';
	} else {
		object.data = 'about:blank';
		element.appendChild(object);
	}

	return {
		cancel: () => {
			win && win.removeEventListener && win.removeEventListener('resize', fn);
			element.removeChild(object);
		}
	};
}

export function toggle_class(element, name, toggle) {
	element.classList[toggle ? 'add' : 'remove'](name);
}

export function custom_event(type, detail) {
	const e = document.createEvent('CustomEvent');
	e.initCustomEvent(type, false, false, detail);
	return e;
}