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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 Complex64 = require( '@stdlib/complex/float32/ctor' );
var replace = require( '@stdlib/string/base/replace' );
var format = require( '@stdlib/string/format' );
// FUNCTIONS //
/**
* Matches a complex number string.
*
* @private
* @returns {RegExp} regular expression
*
* @example
* var re = regexp();
* // returns /^([-+]?(\d*\.?\d*(?:[eE][-+]?\d+)?|Infinity|NaN)i?)?([-+])?((\d*\.?\d*(?:[eE][-+]?\d+)?|Infinity|NaN)i)?$/
*/
function regexp() {
return /^([-+]?(\d*\.?\d*(?:[eE][-+]?\d+)?|Infinity|NaN)i?)?([-+])?((\d*\.?\d*(?:[eE][-+]?\d+)?|Infinity|NaN)i)?$/;
}
// MAIN //
/**
* Parse a string representation of a complex number and returns a Complex64 instance.
*
* @param {string} str - string representation of a complex number
* @throws {TypeError} must provide a string
* @throws {Error} must provide a valid string representation of a complex number
* @returns {Complex64} 64-bit complex number
*
* @example
* var str = '1 + 2i';
* var z = parseComplex64( str );
* // returns <Complex64>
*/
function parseComplex64( str ) {
var match;
var re;
var im = 0;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
}
match = replace( str, /\s/g, '' ).match( regexp() );
if ( !match ) {
throw new Error( format( 'invalid argument. Unable to parse input string as a complex number. Value: `%s`.', str ) );
}
// Real part:
re = ( match[1] && !match[1].endsWith( 'i' ) ) ? parseFloat( match[1] ) : 0;
// Imaginary part:
if ( match[4] ) {
im = ( ( match[3] === '-' ) ? -1 : 1 ) * parseFloat( replace( match[4], /i$/, '' ) );
} else if ( match[1] && match[1].endsWith( 'i' ) ) {
im = parseFloat( replace( match[1], /i$/, '' ) );
}
return new Complex64( re, im );
}
// EXPORTS //
module.exports = parseComplex64;
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