56 lines
1.6 KiB
JavaScript
56 lines
1.6 KiB
JavaScript
|
/**
|
||
|
|
* @license Apache-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2021 The Stdlib Authors.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
'use strict';
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns a regular expression to capture everything that is not a space immediately after the `function` keyword and before the first left parenthesis.
|
||
|
|
*
|
||
|
|
* @returns {RegExp} regular expression
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var RE_NATIVE_FUNCTION = reNativeFunction();
|
||
|
|
* var bool = RE_NATIVE_FUNCTION.test( Date.toString() );
|
||
|
|
* // returns true
|
||
|
|
*/
|
||
|
|
function reNativeFunction() {
|
||
|
|
var str = '';
|
||
|
|
|
||
|
|
// Use a native function as a template:
|
||
|
|
str += Function.prototype.toString.call( Function );
|
||
|
|
|
||
|
|
// Escape special RegExp characters:
|
||
|
|
str = str.replace( /([.*+?^=!:$(){}|[\]\/\\])/g, '\\$1' ); // eslint-disable-line no-useless-escape
|
||
|
|
|
||
|
|
// Replace any mentions of `Function` to make template generic and replace `for ...` and additional info provided in other environments, such as Rhino.
|
||
|
|
str = str.replace( /Function|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?' );
|
||
|
|
|
||
|
|
// Bracket the regular expression:
|
||
|
|
str = '^' + str + '$';
|
||
|
|
|
||
|
|
// Create the regular expression:
|
||
|
|
return new RegExp( str );
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = reNativeFunction;
|