@motorcycle/mostly-dom/lib.es2015/isolate.js

Motorcycle.ts adapter for mostly-dom. Built on @motorcycle/dom.

import { curry3, join } from '@typed/prelude';
import { tap } from '@motorcycle/stream';
/**
 * Isolates a component by adding an isolation class name to the outermost
 * DOM element emitted by the component’s view stream.
 *
 * The isolation class name is generated by appending the given isolation `key`
 * to the prefix `$$isolation$$-`, e.g., given `foo` as `key` produces
 * `$$isolation$$-foo`.
 *
 * Isolating components are useful especially when dealing with lists of a
 * specific component, so that events can be differentiated between the siblings.
 * However, isolated components are not isolated from access by an ancestor DOM
 * element.
 *
 * Note that `isolate` is curried.
 *
 * @name isolate<Sources extends DomSources, Sinks extends DomSinks>(component: Component<Sources, Sinks>, key: string, sources: Sources): Sinks
 *
 * @example
 * import { empty } from '@motorcycle/stream'
 * import { createDomSource } from '@motorcycle/dom'
 *
 * const sources = createDomSource(empty())
 * const sinks = isolate(MyComponent, `myIsolationKey`, sources)
 */
export var isolate = curry3(function isolate(component, key, sources) {
    var dom = sources.dom;
    var isolatedDom = dom.query("." + KEY_PREFIX + key);
    var sinks = component(Object.assign({}, sources, { dom: isolatedDom }));
    var isolatedSinks = Object.assign({}, sinks, { view$: isolateView(sinks.view$, key) });
    return isolatedSinks;
});
var KEY_PREFIX = "__isolation__";
function isolateView(view$, key) {
    var prefixedKey = KEY_PREFIX + key;
    return tap(function (vNode) {
        var _a = vNode.props.className, className = _a === void 0 ? EMPTY_CLASS_NAME : _a;
        var needsIsolation = className.indexOf(prefixedKey) === -1;
        if (needsIsolation)
            vNode.props.className = removeSuperfluousSpaces(join(CLASS_NAME_SEPARATOR, [className, prefixedKey]));
    }, view$);
}
var EMPTY_CLASS_NAME = "";
var CLASS_NAME_SEPARATOR = " ";
function removeSuperfluousSpaces(str) {
    return str.replace(RE_TWO_OR_MORE_SPACES, CLASS_NAME_SEPARATOR);
}
var RE_TWO_OR_MORE_SPACES = /\s{2,}/g;
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