106 lines
2.8 KiB
JavaScript
106 lines
2.8 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _lodash = require('lodash');
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var _lodash2 = _interopRequireDefault(_lodash);
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var _stringWidth = require('string-width');
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var _stringWidth2 = _interopRequireDefault(_stringWidth);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const alignments = ['left', 'right', 'center'];
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/**
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* @param {string} subject
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* @param {number} width
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* @returns {string}
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*/
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const alignLeft = (subject, width) => {
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return subject + _lodash2.default.repeat(' ', width);
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};
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/**
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* @param {string} subject
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* @param {number} width
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* @returns {string}
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*/
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const alignRight = (subject, width) => {
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return _lodash2.default.repeat(' ', width) + subject;
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};
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/**
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* @param {string} subject
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* @param {number} width
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* @returns {string}
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*/
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const alignCenter = (subject, width) => {
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let halfWidth;
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halfWidth = width / 2;
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if (halfWidth % 2 === 0) {
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return _lodash2.default.repeat(' ', halfWidth) + subject + _lodash2.default.repeat(' ', halfWidth);
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} else {
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halfWidth = _lodash2.default.floor(halfWidth);
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return _lodash2.default.repeat(' ', halfWidth) + subject + _lodash2.default.repeat(' ', halfWidth + 1);
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}
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};
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/**
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* Pads a string to the left and/or right to position the subject
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* text in a desired alignment within a container.
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*
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* @param {string} subject
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* @param {number} containerWidth
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* @param {string} alignment One of the valid options (left, right, center).
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* @returns {string}
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*/
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exports.default = (subject, containerWidth, alignment) => {
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if (!_lodash2.default.isString(subject)) {
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throw new TypeError('Subject parameter value must be a string.');
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}
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if (!_lodash2.default.isNumber(containerWidth)) {
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throw new TypeError('Container width parameter value must be a number.');
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}
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const subjectWidth = (0, _stringWidth2.default)(subject);
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if (subjectWidth > containerWidth) {
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// console.log('subjectWidth', subjectWidth, 'containerWidth', containerWidth, 'subject', subject);
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throw new Error('Subject parameter value width cannot be greater than the container width.');
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}
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if (!_lodash2.default.isString(alignment)) {
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throw new TypeError('Alignment parameter value must be a string.');
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}
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if (alignments.indexOf(alignment) === -1) {
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throw new Error('Alignment parameter value must be a known alignment parameter value (left, right, center).');
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}
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if (subjectWidth === 0) {
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return _lodash2.default.repeat(' ', containerWidth);
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}
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const availableWidth = containerWidth - subjectWidth;
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if (alignment === 'left') {
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return alignLeft(subject, availableWidth);
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}
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if (alignment === 'right') {
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return alignRight(subject, availableWidth);
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}
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return alignCenter(subject, availableWidth);
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}; |