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