/**
 * @license
 * Copyright 2017 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.
 * =============================================================================
 */
import { env } from './environment';
import { isTypedArrayBrowser } from './platforms/is_typed_array_browser';
import * as base from './util_base';
export * from './util_base';
export * from './hash_util';
/**
 * Create typed array for scalar value. Used for storing in `DataStorage`.
 */
export function createScalarValue(value, dtype) {
    if (dtype === 'string') {
        return encodeString(value);
    }
    return toTypedArray([value], dtype);
}
function noConversionNeeded(a, dtype) {
    return (a instanceof Float32Array && dtype === 'float32') ||
        (a instanceof Int32Array && dtype === 'int32') ||
        (a instanceof Uint8Array && dtype === 'bool');
}
export function toTypedArray(a, dtype) {
    if (dtype === 'string') {
        throw new Error('Cannot convert a string[] to a TypedArray');
    }
    if (Array.isArray(a)) {
        a = flatten(a);
    }
    if (env().getBool('DEBUG')) {
        base.checkConversionForErrors(a, dtype);
    }
    if (noConversionNeeded(a, dtype)) {
        return a;
    }
    if (dtype == null || dtype === 'float32' || dtype === 'complex64') {
        return new Float32Array(a);
    }
    else if (dtype === 'int32') {
        return new Int32Array(a);
    }
    else if (dtype === 'bool') {
        const bool = new Uint8Array(a.length);
        for (let i = 0; i < bool.length; ++i) {
            if (Math.round(a[i]) !== 0) {
                bool[i] = 1;
            }
        }
        return bool;
    }
    else {
        throw new Error(`Unknown data type ${dtype}`);
    }
}
/**
 * Returns the current high-resolution time in milliseconds relative to an
 * arbitrary time in the past. It works across different platforms (node.js,
 * browsers).
 *
 * ```js
 * console.log(tf.util.now());
 * ```
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
export function now() {
    return env().platform.now();
}
/**
 * Returns a platform-specific implementation of
 * [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).
 *
 * If `fetch` is defined on the global object (`window`, `process`, etc.),
 * `tf.util.fetch` returns that function.
 *
 * If not, `tf.util.fetch` returns a platform-specific solution.
 *
 * ```js
 * const resource = await tf.util.fetch('https://cdn.jsdelivr.net/npm/@tensorflow/tfjs');
 * // handle response
 * ```
 *
 * @doc {heading: 'Util'}
 */
export function fetch(path, requestInits) {
    return env().platform.fetch(path, requestInits);
}
/**
 * Encodes the provided string into bytes using the provided encoding scheme.
 *
 * @param s The string to encode.
 * @param encoding The encoding scheme. Defaults to utf-8.
 *
 * @doc {heading: 'Util'}
 */
export function encodeString(s, encoding = 'utf-8') {
    encoding = encoding || 'utf-8';
    return env().platform.encode(s, encoding);
}
/**
 * Decodes the provided bytes into a string using the provided encoding scheme.
 * @param bytes The bytes to decode.
 *
 * @param encoding The encoding scheme. Defaults to utf-8.
 *
 * @doc {heading: 'Util'}
 */
export function decodeString(bytes, encoding = 'utf-8') {
    encoding = encoding || 'utf-8';
    return env().platform.decode(bytes, encoding);
}
export function isTypedArray(a) {
    // TODO(mattsoulanille): Remove this fallback in 5.0.0
    if (env().platform.isTypedArray != null) {
        return env().platform.isTypedArray(a);
    }
    else {
        return isTypedArrayBrowser(a);
    }
}
// NOTE: We explicitly type out what T extends instead of any so that
// util.flatten on a nested array of number doesn't try to infer T as a
// number[][], causing us to explicitly type util.flatten<number>().
/**
 *  Flattens an arbitrarily nested array.
 *
 * ```js
 * const a = [[1, 2], [3, 4], [5, [6, [7]]]];
 * const flat = tf.util.flatten(a);
 * console.log(flat);
 * ```
 *
 *  @param arr The nested array to flatten.
 *  @param result The destination array which holds the elements.
 *  @param skipTypedArray If true, avoids flattening the typed arrays. Defaults
 *      to false.
 *
 * @doc {heading: 'Util', namespace: 'util'}
 */
export function flatten(arr, result = [], skipTypedArray = false) {
    if (result == null) {
        result = [];
    }
    if (typeof arr === 'boolean' || typeof arr === 'number' ||
        typeof arr === 'string' || base.isPromise(arr) || arr == null ||
        isTypedArray(arr) && skipTypedArray) {
        result.push(arr);
    }
    else if (Array.isArray(arr) || isTypedArray(arr)) {
        for (let i = 0; i < arr.length; ++i) {
            flatten(arr[i], result, skipTypedArray);
        }
    }
    else {
        let maxIndex = -1;
        for (const key of Object.keys(arr)) {
            // 0 or positive integer.
            if (/^([1-9]+[0-9]*|0)$/.test(key)) {
                maxIndex = Math.max(maxIndex, Number(key));
            }
        }
        for (let i = 0; i <= maxIndex; i++) {
            // tslint:disable-next-line: no-unnecessary-type-assertion
            flatten(arr[i], result, skipTypedArray);
        }
    }
    return result;
}
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All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport {env} from './environment';\nimport {isTypedArrayBrowser} from './platforms/is_typed_array_browser';\nimport {BackendValues, DataType, RecursiveArray, TensorLike, TypedArray} from './types';\nimport * as base from './util_base';\nexport * from './util_base';\nexport * from './hash_util';\n\n/**\n * Create typed array for scalar value. Used for storing in `DataStorage`.\n */\nexport function createScalarValue(\n    value: DataType, dtype: DataType): BackendValues {\n  if (dtype === 'string') {\n    return encodeString(value);\n  }\n\n  return toTypedArray([value], dtype);\n}\n\nfunction noConversionNeeded(a: TensorLike, dtype: DataType): boolean {\n  return (a instanceof Float32Array && dtype === 'float32') ||\n      (a instanceof Int32Array && dtype === 'int32') ||\n      (a instanceof Uint8Array && dtype === 'bool');\n}\n\nexport function toTypedArray(a: TensorLike, dtype: DataType): TypedArray {\n  if (dtype === 'string') {\n    throw new Error('Cannot convert a string[] to a TypedArray');\n  }\n  if (Array.isArray(a)) {\n    a = flatten(a);\n  }\n\n  if (env().getBool('DEBUG')) {\n    base.checkConversionForErrors(a as number[], dtype);\n  }\n  if (noConversionNeeded(a, dtype)) {\n    return a as TypedArray;\n  }\n  if (dtype == null || dtype === 'float32' || dtype === 'complex64') {\n    return new Float32Array(a as number[]);\n  } else if (dtype === 'int32') {\n    return new Int32Array(a as number[]);\n  } else if (dtype === 'bool') {\n    const bool = new Uint8Array((a as number[]).length);\n    for (let i = 0; i < bool.length; ++i) {\n      if (Math.round((a as number[])[i]) !== 0) {\n        bool[i] = 1;\n      }\n    }\n    return bool;\n  } else {\n    throw new Error(`Unknown data type ${dtype}`);\n  }\n}\n\n/**\n * Returns the current high-resolution time in milliseconds relative to an\n * arbitrary time in the past. It works across different platforms (node.js,\n * browsers).\n *\n * ```js\n * console.log(tf.util.now());\n * ```\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\nexport function now(): number {\n  return env().platform.now();\n}\n\n/**\n * Returns a platform-specific implementation of\n * [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API).\n *\n * If `fetch` is defined on the global object (`window`, `process`, etc.),\n * `tf.util.fetch` returns that function.\n *\n * If not, `tf.util.fetch` returns a platform-specific solution.\n *\n * ```js\n * const resource = await tf.util.fetch('https://cdn.jsdelivr.net/npm/@tensorflow/tfjs');\n * // handle response\n * ```\n *\n * @doc {heading: 'Util'}\n */\nexport function fetch(\n    path: string, requestInits?: RequestInit): Promise<Response> {\n  return env().platform.fetch(path, requestInits);\n}\n\n/**\n * Encodes the provided string into bytes using the provided encoding scheme.\n *\n * @param s The string to encode.\n * @param encoding The encoding scheme. Defaults to utf-8.\n *\n * @doc {heading: 'Util'}\n */\nexport function encodeString(s: string, encoding = 'utf-8'): Uint8Array {\n  encoding = encoding || 'utf-8';\n  return env().platform.encode(s, encoding);\n}\n\n/**\n * Decodes the provided bytes into a string using the provided encoding scheme.\n * @param bytes The bytes to decode.\n *\n * @param encoding The encoding scheme. Defaults to utf-8.\n *\n * @doc {heading: 'Util'}\n */\nexport function decodeString(bytes: Uint8Array, encoding = 'utf-8'): string {\n  encoding = encoding || 'utf-8';\n  return env().platform.decode(bytes, encoding);\n}\n\nexport function isTypedArray(a: {}): a is Float32Array|Int32Array|Uint8Array|\n    Uint8ClampedArray {\n  // TODO(mattsoulanille): Remove this fallback in 5.0.0\n  if (env().platform.isTypedArray != null) {\n    return env().platform.isTypedArray(a);\n  } else {\n    return isTypedArrayBrowser(a);\n  }\n}\n\n// NOTE: We explicitly type out what T extends instead of any so that\n// util.flatten on a nested array of number doesn't try to infer T as a\n// number[][], causing us to explicitly type util.flatten<number>().\n/**\n *  Flattens an arbitrarily nested array.\n *\n * ```js\n * const a = [[1, 2], [3, 4], [5, [6, [7]]]];\n * const flat = tf.util.flatten(a);\n * console.log(flat);\n * ```\n *\n *  @param arr The nested array to flatten.\n *  @param result The destination array which holds the elements.\n *  @param skipTypedArray If true, avoids flattening the typed arrays. Defaults\n *      to false.\n *\n * @doc {heading: 'Util', namespace: 'util'}\n */\nexport function\nflatten<T extends number|boolean|string|Promise<number>|TypedArray>(\n    arr: T|RecursiveArray<T>, result: T[] = [], skipTypedArray = false): T[] {\n  if (result == null) {\n    result = [];\n  }\n  if (typeof arr === 'boolean' || typeof arr === 'number' ||\n    typeof arr === 'string' || base.isPromise(arr) || arr == null ||\n      isTypedArray(arr) && skipTypedArray) {\n    result.push(arr as T);\n  } else if (Array.isArray(arr) || isTypedArray(arr)) {\n    for (let i = 0; i < arr.length; ++i) {\n      flatten(arr[i], result, skipTypedArray);\n    }\n  } else {\n    let maxIndex = -1;\n    for (const key of Object.keys(arr)) {\n      // 0 or positive integer.\n      if (/^([1-9]+[0-9]*|0)$/.test(key)) {\n        maxIndex = Math.max(maxIndex, Number(key));\n      }\n    }\n    for (let i = 0; i <= maxIndex; i++) {\n      // tslint:disable-next-line: no-unnecessary-type-assertion\n      flatten((arr as RecursiveArray<T>)[i], result, skipTypedArray);\n    }\n  }\n  return result;\n}\n"]}