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coerce-date-property.ts
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coerce-date-property.ts
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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {DateAdapter} from '@angular/material/core';
/**
* Function that attempts to coerce a value to a date using a DateAdapter. Date instances, null,
* and undefined will be passed through. Empty strings will be coerced to null. Valid ISO 8601
* strings (https://www.ietf.org/rfc/rfc3339.txt) will be coerced to dates. All other values will
* result in an error being thrown.
* @param adapter The date adapter to use for coercion
* @param value The value to coerce.
* @return A date object coerced from the value.
* @throws Throws when the value cannot be coerced.
*/
export function coerceDateProperty<D>(adapter: DateAdapter<D>, value: any): D | null {
if (typeof value === 'string') {
if (value == '') {
value = null;
} else {
value = adapter.fromIso8601(value) || value;
}
}
if (value == null || adapter.isDateInstance(value)) {
return value;
}
throw Error(`Datepicker: Value must be either a date object recognized by the DateAdapter or ` +
`an ISO 8601 string. Instead got: ${value}`);
}