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import { Key, KeyPath, Value } from "./types";
import valueToKey from "./valueToKey";
// http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-extracting-a-key-from-a-value-using-a-key-path
const extractKey = (keyPath: KeyPath, value: Value) => {
if (Array.isArray(keyPath)) {
const result: Key[] = [];
for (let item of keyPath) {
// This doesn't make sense to me based on the spec, but it is needed to pass the W3C KeyPath tests (see same
// comment in validateKeyPath)
if (
item !== undefined &&
item !== null &&
typeof item !== "string" &&
(item as any).toString
) {
item = (item as any).toString();
}
result.push(valueToKey(extractKey(item, value)));
}
return result;
}
if (keyPath === "") {
return value;
}
let remainingKeyPath: string | null = keyPath;
let object = value;
while (remainingKeyPath !== null) {
let identifier;
const i = remainingKeyPath.indexOf(".");
if (i >= 0) {
identifier = remainingKeyPath.slice(0, i);
remainingKeyPath = remainingKeyPath.slice(i + 1);
} else {
identifier = remainingKeyPath;
remainingKeyPath = null;
}
if (!object.hasOwnProperty(identifier)) {
return;
}
object = object[identifier];
}
return object;
};
export default extractKey;
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