import {TypedArray} from '../types';

/*

* @license

* Copyright 2018 Google LLC. All Rights Reserved.

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

* =============================================================================

*/

/**

* Tests a boolean expression and throws a message if false.

*/

export function assert(expr: boolean, msg: string|(() => string)) {

if (!expr) {

throw new Error(typeof msg === 'string' ? msg : msg());

}

}

export function assertShapesMatch(

shapeA: number[], shapeB: number[], errorMessagePrefix = ''): void {

assert(

arraysEqual(shapeA, shapeB),

errorMessagePrefix + ` Shapes ${shapeA} and ${shapeB} must match`);

}

export function arraysEqual(n1: number[]|TypedArray, n2: number[]|TypedArray) {

if (n1.length !== n2.length) {

return false;

}

for (let i = 0; i < n1.length; i++) {

if (n1[i] !== n2[i]) {

return false;

}

}

return true;

}

// Number of decimal places to when checking float similarity

export const DECIMAL_PLACES_TO_CHECK = 4;