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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 replace = require( '@stdlib/string/replace' );
var Number = require( '@stdlib/number/ctor' );
// 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} 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 imaginaryParts = [];
var currentToken = '';
var isImaginary;
var realParts = [];
var parts = [];
var valid = true;
var value;
var part;
var re = 0;
var im = 0;
var i;
if ( typeof str !== 'string' ) {
return null;
}
str = replace( str, ' ', '' );
for ( i = 0; i < str.length; i++ ) {
if ( (str[i] === '+' || str[i] === '-') && i !== 0 && str[i - 1] !== 'e' ) {
parts.push( currentToken );
currentToken = '';
} else if ( i === str.length - 1 ) {
currentToken += str[ i ];
parts.push( currentToken );
}
currentToken += str[ i ];
}
for ( i = 0; i < parts.length; i++ ) { // Check for invalid parts...
part = parts[ i ];
isImaginary = false;
// Check for Iota on either sides:
if ( part[0] === 'i' ) {
part = part.slice( 1 );
isImaginary = true;
} else if ( part[part.length - 1] === 'i' ) {
part = part.slice( 0, part.length - 1 );
isImaginary = true;
}
value = Number( part );
if ( isNaN( value ) && part !== 'NaN' && part !== '+NaN' && part !== '-NaN' ) {
valid = false;
break;
}
if ( isImaginary ) {
imaginaryParts.push( value );
}
else {
realParts.push( value );
}
}
if ( !valid ) {
return null;
}
for ( i = 0; i < realParts.length; i++ ) {
re += realParts[i];
}
for ( i = 0; i < imaginaryParts.length; i++ ) {
im += imaginaryParts[i];
}
return {
're': re,
'im': im
};
}
// EXPORTS //
module.exports = parse;
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