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* @license Apache-2.0
*
* Copyright (c) 2024 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 regexp = require( './regexp.js' );
// MAIN //
/**
* Parses a string representing a complex number into a complex-like object.
*
* ## Notes
*
* - The function returns an object containing the following properties:
*
* - **re**: real component
* - **im**: imaginary component
*
* @param {string} str - input string
* @returns {(ComplexLike|null)} an object containing real and imaginary parts
*
* @example
* var str = '4 + 6i';
*
* var z = parse( str );
* // returns { 're': 4, 'im': 6 }
*/
function parse( str ) {
var match;
var re;
var im;
if ( !isString( str ) || str === '' ) {
return null;
}
// OPTIMIZE: Consider implementing an alternative parser to improve performance over regular expression
match = str.match( regexp() ); // [ full_match, real_sign, real_value, imag_sign, imag_value, imag_suffix ]
if ( match === null ) {
return null;
}
// Real component:
if ( match[ 2 ] ) {
re = ( match[ 1 ] === '-' ) ? -1.0 : 1.0;
re *= parseFloat( match[ 2 ] );
} else {
re = 0.0;
}
// Imaginary component:
if ( match[ 5 ] ) {
im = ( match[ 3 ] === '-' ) ? -1.0 : 1.0;
if ( match[ 4 ] ) {
im *= parseFloat( match[ 4 ] );
}
} else {
im = 0.0;
}
return {
're': re,
'im': im
};
}
// EXPORTS //
module.exports = parse;
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