ssr.js

// https://html.spec.whatwg.org/multipage/syntax.html#attributes-2
// https://infra.spec.whatwg.org/#noncharacter
export const invalidAttributeNameCharacter = /[\s'">\/=\u{FDD0}-\u{FDEF}\u{FFFE}\u{FFFF}\u{1FFFE}\u{1FFFF}\u{2FFFE}\u{2FFFF}\u{3FFFE}\u{3FFFF}\u{4FFFE}\u{4FFFF}\u{5FFFE}\u{5FFFF}\u{6FFFE}\u{6FFFF}\u{7FFFE}\u{7FFFF}\u{8FFFE}\u{8FFFF}\u{9FFFE}\u{9FFFF}\u{AFFFE}\u{AFFFF}\u{BFFFE}\u{BFFFF}\u{CFFFE}\u{CFFFF}\u{DFFFE}\u{DFFFF}\u{EFFFE}\u{EFFFF}\u{FFFFE}\u{FFFFF}\u{10FFFE}\u{10FFFF}]/u;

export function spread(args) {
	const attributes = Object.assign({}, ...args);
	let str = '';

	Object.keys(attributes).forEach(name => {
		if (invalidAttributeNameCharacter.test(name)) return;

		const value = attributes[name];
		if (value === undefined) return;
		if (value === true) str += " " + name;

		const escaped = String(value)
			.replace(/"/g, '"')
			.replace(/'/g, ''');

		str += " " + name + "=" + JSON.stringify(escaped);
	});

	return str;
}

export const escaped = {
	'"': '"',
	"'": ''',
	'&': '&',
	'<': '&lt;',
	'>': '&gt;'
};

export function escape(html) {
	return String(html).replace(/["'&<>]/g, match => escaped[match]);
}

export function each(items, assign, fn) {
	let str = '';
	for (let i = 0; i < items.length; i += 1) {
		str += fn(assign(items[i], i));
	}
	return str;
}

export const missingComponent = {
	_render: () => ''
};

export function validateSsrComponent(component, name) {
	if (!component || !component._render) {
		if (name === 'svelte:component') name += 'this={...}';
		throw new Error(`<${name}> is not a valid SSR component. You may need to review your build config to ensure that dependencies are compiled, rather than imported as pre-compiled modules`);
	}

	return component;
}