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import { isString, delve } from './util';
/** Create an Event handler function that sets a given state property.
* @param {Component} component The component whose state should be updated
* @param {string} key A dot-notated key path to update in the component's state
* @param {string} eventPath A dot-notated key path to the value that should be retrieved from the Event or component
* @returns {function} linkedStateHandler
* @private
*/
export function createLinkedState(component, key, eventPath) {
let path = key.split('.');
return function(e) {
let t = e && e.target || this,
state = {},
obj = state,
v = isString(eventPath) ? delve(e, eventPath) : t.nodeName ? (t.type.match(/^che|rad/) ? t.checked : t.value) : e,
i = 0;
for ( ; i<path.length-1; i++) {
obj = obj[path[i]] || (obj[path[i]] = !i && component.state[path[i]] || {});
}
obj[path[i]] = v;
component.setState(state);
};
}
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