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* @license Apache-2.0
*
* Copyright (c) 2018 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';
// MODULES //
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var format = require( '@stdlib/string/format' );
// VARIABLES //
var RE_CHARS = /[-\/\\^$*+?.()|[\]{}]/g; // eslint-disable-line no-useless-escape
// MAIN //
/**
* Escapes a regular expression string.
*
* @param {string} str - regular expression string
* @throws {TypeError} first argument must be a string
* @returns {string} escaped string
*
* @example
* var str = rescape( '[A-Z]*' );
* // returns '\\[A\\-Z\\]\\*'
*/
function rescape( str ) {
var len;
var s;
var i;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. Must provide a regular expression string. Value: `%s`.', str ) );
}
// Check if the string starts with a forward slash...
if ( str[ 0 ] === '/' ) {
// Find the last forward slash...
len = str.length;
for ( i = len-1; i >= 0; i-- ) {
if ( str[ i ] === '/' ) {
break;
}
}
}
// If we searched the string to no avail or if the first letter is not `/`, assume that the string is not of the form `/[...]/[guimy]`:
if ( i === void 0 || i <= 0 ) {
return str.replace( RE_CHARS, '\\$&' );
}
// We need to de-construct the string...
s = str.substring( 1, i );
// Only escape the characters between the `/`:
s = s.replace( RE_CHARS, '\\$&' );
// Reassemble:
str = str[ 0 ] + s + str.substring( i );
return str;
}
// EXPORTS //
module.exports = rescape;
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