56 lines
1.6 KiB
JavaScript
56 lines
1.6 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MAIN //
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/**
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* Returns a regular expression to capture everything that is not a space immediately after the `function` keyword and before the first left parenthesis.
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*
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* @returns {RegExp} regular expression
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*
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* @example
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* var RE_NATIVE_FUNCTION = reNativeFunction();
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* var bool = RE_NATIVE_FUNCTION.test( Date.toString() );
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* // returns true
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*/
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function reNativeFunction() {
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var str = '';
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// Use a native function as a template:
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str += Function.prototype.toString.call( Function );
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// Escape special RegExp characters:
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str = str.replace( /([.*+?^=!:$(){}|[\]\/\\])/g, '\\$1' ); // eslint-disable-line no-useless-escape
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// Replace any mentions of `Function` to make template generic and replace `for ...` and additional info provided in other environments, such as Rhino.
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str = str.replace( /Function|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?' );
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// Bracket the regular expression:
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str = '^' + str + '$';
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// Create the regular expression:
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return new RegExp( str );
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}
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// EXPORTS //
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module.exports = reNativeFunction;
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