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96 lines
2.3 KiB
96 lines
2.3 KiB
import _ from 'lodash';
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import stringWidth from 'string-width';
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const alignments = [
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'left',
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'right',
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'center'
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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 alignLeft = (subject, width) => {
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return subject + ' '.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 ' '.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 ' '.repeat(halfWidth) + subject + ' '.repeat(halfWidth);
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} else {
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halfWidth = Math.floor(halfWidth);
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return ' '.repeat(halfWidth) + subject + ' '.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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export default (subject, containerWidth, alignment) => {
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if (!_.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 (!_.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 = stringWidth(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 (!_.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.includes(alignment)) {
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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 ' '.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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};
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