65 lines
1.4 KiB
JavaScript
65 lines
1.4 KiB
JavaScript
'use strict';
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function preserveCamelCase(str) {
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let isLastCharLower = false;
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let isLastCharUpper = false;
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let isLastLastCharUpper = false;
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for (let i = 0; i < str.length; i++) {
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const c = str[i];
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if (isLastCharLower && /[a-zA-Z]/.test(c) && c.toUpperCase() === c) {
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str = str.substr(0, i) + '-' + str.substr(i);
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isLastCharLower = false;
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isLastLastCharUpper = isLastCharUpper;
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isLastCharUpper = true;
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i++;
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} else if (isLastCharUpper && isLastLastCharUpper && /[a-zA-Z]/.test(c) && c.toLowerCase() === c) {
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str = str.substr(0, i - 1) + '-' + str.substr(i - 1);
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isLastLastCharUpper = isLastCharUpper;
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isLastCharUpper = false;
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isLastCharLower = true;
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} else {
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isLastCharLower = c.toLowerCase() === c;
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isLastLastCharUpper = isLastCharUpper;
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isLastCharUpper = c.toUpperCase() === c;
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}
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}
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return str;
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}
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module.exports = function (str) {
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if (arguments.length > 1) {
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str = Array.from(arguments)
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.map(x => x.trim())
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.filter(x => x.length)
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.join('-');
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} else {
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str = str.trim();
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}
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if (str.length === 0) {
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return '';
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}
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if (str.length === 1) {
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return str.toLowerCase();
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}
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if (/^[a-z0-9]+$/.test(str)) {
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return str;
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}
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const hasUpperCase = str !== str.toLowerCase();
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if (hasUpperCase) {
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str = preserveCamelCase(str);
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}
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return str
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.replace(/^[_.\- ]+/, '')
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.toLowerCase()
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.replace(/[_.\- ]+(\w|$)/g, (m, p1) => p1.toUpperCase());
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};
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