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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';
// MODULES //
var isNumber = require( './is_number.js' );
var zeroPad = require( './zero_pad.js' );
// NOTE: for the following, we explicitly avoid using stdlib packages in this particular package in order to avoid circular dependencies.
var lowercase = String.prototype.toLowerCase;
var uppercase = String.prototype.toUpperCase;
// MAIN //
/**
* Formats a token object argument as an integer.
*
* @private
* @param {Object} token - token object
* @throws {Error} must provide a valid integer
* @returns {string} formatted token argument
*/
function formatInteger( token ) {
var base;
var out;
var i;
switch ( token.specifier ) {
case 'b':
// Case: %b (binary)
base = 2;
break;
case 'o':
// Case: %o (octal)
base = 8;
break;
case 'x':
case 'X':
// Case: %x, %X (hexadecimal)
base = 16;
break;
case 'd':
case 'i':
case 'u':
default:
// Case: %d, %i, %u (decimal)
base = 10;
break;
}
out = token.arg;
i = parseInt( out, 10 );
if ( !isFinite( i ) ) { // NOTE: We use the global `isFinite` function here instead of `@stdlib/math/base/assert/is-finite` in order to avoid circular dependencies.
if ( !isNumber( out ) ) {
throw new Error( 'invalid integer. Value: ' + out );
}
i = 0;
}
if ( i < 0 && ( token.specifier === 'u' || base !== 10 ) ) {
i = 0xffffffff + i + 1;
}
if ( i < 0 ) {
out = ( -i ).toString( base );
if ( token.precision ) {
out = zeroPad( out, token.precision, token.padRight );
}
out = '-' + out;
} else {
out = i.toString( base );
if ( !i && !token.precision ) {
out = '';
} else if ( token.precision ) {
out = zeroPad( out, token.precision, token.padRight );
}
if ( token.sign ) {
out = token.sign + out;
}
}
if ( base === 16 ) {
if ( token.alternate ) {
out = '0x' + out;
}
out = ( token.specifier === uppercase.call( token.specifier ) ) ?
uppercase.call( out ) :
lowercase.call( out );
}
if ( base === 8 ) {
if ( token.alternate && out.charAt( 0 ) !== '0' ) {
out = '0' + out;
}
}
return out;
}
// EXPORTS //
module.exports = formatInteger;
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