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'use strict';
function preserveCamelCase(str) {
var isLastCharLower = false;
for (var i = 0; i < str.length; i++) {
var c = str.charAt(i);
if (isLastCharLower && (/[a-zA-Z]/).test(c) && c.toUpperCase() === c) {
str = str.substr(0, i) + '-' + str.substr(i);
isLastCharLower = false;
i++;
} else {
isLastCharLower = (c.toLowerCase() === c);
}
}
return str;
}
module.exports = function () {
var str = [].map.call(arguments, function (str) {
return str.trim();
}).filter(function (str) {
return str.length;
}).join('-');
if (!str.length) {
return '';
}
if (str.length === 1) {
return str;
}
if (!(/[_.\- ]+/).test(str)) {
if (str === str.toUpperCase()) {
return str.toLowerCase();
}
if (str[0] !== str[0].toLowerCase()) {
return str[0].toLowerCase() + str.slice(1);
}
return str;
}
str = preserveCamelCase(str);
return str
.replace(/^[_.\- ]+/, '')
.toLowerCase()
.replace(/[_.\- ]+(\w|$)/g, function (m, p1) {
return p1.toUpperCase();
});
};