116 lines
2.7 KiB
JavaScript
116 lines
2.7 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2022 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isNumber = require( './is_number.js' );
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var zeroPad = require( './zero_pad.js' );
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// NOTE: for the following, we explicitly avoid using stdlib packages in this particular package in order to avoid circular dependencies.
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var lowercase = String.prototype.toLowerCase;
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var uppercase = String.prototype.toUpperCase;
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// MAIN //
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/**
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* Formats a token object argument as an integer.
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*
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* @private
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* @param {Object} token - token object
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* @throws {Error} must provide a valid integer
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* @returns {string} formatted token argument
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*/
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function formatInteger( token ) {
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var base;
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var out;
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var i;
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switch ( token.specifier ) {
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case 'b':
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// Case: %b (binary)
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base = 2;
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break;
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case 'o':
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// Case: %o (octal)
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base = 8;
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break;
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case 'x':
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case 'X':
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// Case: %x, %X (hexadecimal)
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base = 16;
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break;
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case 'd':
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case 'i':
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case 'u':
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default:
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// Case: %d, %i, %u (decimal)
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base = 10;
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break;
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}
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out = token.arg;
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i = parseInt( out, 10 );
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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.
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if ( !isNumber( out ) ) {
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throw new Error( 'invalid integer. Value: ' + out );
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}
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i = 0;
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}
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if ( i < 0 && ( token.specifier === 'u' || base !== 10 ) ) {
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i = 0xffffffff + i + 1;
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}
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if ( i < 0 ) {
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out = ( -i ).toString( base );
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if ( token.precision ) {
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out = zeroPad( out, token.precision, token.padRight );
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}
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out = '-' + out;
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} else {
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out = i.toString( base );
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if ( !i && !token.precision ) {
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out = '';
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} else if ( token.precision ) {
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out = zeroPad( out, token.precision, token.padRight );
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}
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if ( token.sign ) {
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out = token.sign + out;
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}
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}
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if ( base === 16 ) {
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if ( token.alternate ) {
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out = '0x' + out;
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}
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out = ( token.specifier === uppercase.call( token.specifier ) ) ?
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uppercase.call( out ) :
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lowercase.call( out );
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}
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if ( base === 8 ) {
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if ( token.alternate && out.charAt( 0 ) !== '0' ) {
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out = '0' + out;
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}
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}
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return out;
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}
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// EXPORTS //
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module.exports = formatInteger;
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