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* @license Apache-2.0
*
* Copyright (c) 2022 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';
// FUNCTIONS //
/**
* Tests if a string starts with a minus sign (`-`).
*
* @private
* @param {string} str - input string
* @returns {boolean} boolean indicating if a string starts with a minus sign (`-`)
*/
function startsWithMinus( str ) {
return str[ 0 ] === '-';
}
/**
* Returns a string of `n` zeros.
*
* @private
* @param {number} n - number of zeros
* @returns {string} string of zeros
*/
function zeros( n ) {
var out = '';
var i;
for ( i = 0; i < n; i++ ) {
out += '0';
}
return out;
}
// MAIN //
/**
* Pads a token with zeros to the specified width.
*
* @private
* @param {string} str - token argument
* @param {number} width - token width
* @param {boolean} [right=false] - boolean indicating whether to pad to the right
* @returns {string} padded token argument
*/
function zeroPad( str, width, right ) {
var negative = false;
var pad = width - str.length;
if ( pad < 0 ) {
return str;
}
if ( startsWithMinus( str ) ) {
negative = true;
str = str.substr( 1 );
}
str = ( right ) ?
str + zeros( pad ) :
zeros( pad ) + str;
if ( negative ) {
str = '-' + str;
}
return str;
}
// EXPORTS //
module.exports = zeroPad;
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