83 lines
2.3 KiB
JavaScript
83 lines
2.3 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 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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// MODULES //
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var validate = require( './validate.js' );
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// VARIABLES //
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var REGEXP_STRING = '[\u0009\u000A\u000B\u000C\u000D\u0020\u0085\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF]';
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// MAIN //
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/**
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* Returns a regular expression to match a white space character.
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*
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* @param {Options} [options] - function options
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* @param {string} [options.flags=''] - regular expression flags
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* @param {boolean} [options.capture=false] - boolean indicating whether to wrap a regular expression matching white space characters with a capture group
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* @throws {TypeError} options argument must be an object
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* @throws {TypeError} must provide valid options
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* @returns {RegExp} regular expression
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*
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* @example
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* var RE_WHITESPACE = reWhitespace();
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*
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* var bool = RE_WHITESPACE.test( ' ' );
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* // returns true
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*
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* bool = RE_WHITESPACE.test( '\t' );
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* // returns true
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*
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* @example
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* var replace = require( '@stdlib/string/replace' );
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* var RE_WHITESPACE = reWhitespace({
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* 'capture': true
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* });
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*
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* var str = 'Duplicate capture';
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* var out = replace( str, RE_WHITESPACE, '$1$1' );
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* // returns 'Duplicate capture'
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*/
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function reWhitespace( options ) {
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var opts;
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var err;
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if ( arguments.length > 0 ) {
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opts = {};
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err = validate( opts, options );
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if ( err ) {
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throw err;
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}
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if ( opts.capture ) {
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return new RegExp( '('+REGEXP_STRING+')', opts.flags );
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}
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return new RegExp( REGEXP_STRING, opts.flags );
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}
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return /[\u0009\u000A\u000B\u000C\u000D\u0020\u0085\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u2028\u2029\u202F\u205F\u3000\uFEFF]/; // eslint-disable-line no-control-regex
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}
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// EXPORTS //
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module.exports = reWhitespace;
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