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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.charAt(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 () {
let str = [].map.call(arguments, x => x.trim()).filter(x => x.length).join('-');
if (str.length === 0) {
return '';
}
if (str.length === 1) {
return str.toLowerCase();
}
str = preserveCamelCase(str);
return str
.replace(/^[_.\- ]+/, '')
.toLowerCase()
.replace(/[_.\- ]+(\w|$)/g, (m, p1) => p1.toUpperCase());
};
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