conveyal/modeify

/**
 * Expose `toNoCase`.
 */

module.exports = toNoCase;


/**
 * Test whether a string is camel-case.
 */

var hasSpace = /\s/;
var hasCamel = /[a-z][A-Z]/;
var hasSeparator = /[\W_]/;


/**
 * Remove any starting case from a `string`, like camel or snake, but keep
 * spaces and punctuation that may be important otherwise.
 *
 * @param {String} string
 * @return {String}
 */

function toNoCase (string) {
  if (hasSpace.test(string)) return string.toLowerCase();

  if (hasSeparator.test(string)) string = unseparate(string);
  if (hasCamel.test(string)) string = uncamelize(string);
  return string.toLowerCase();
}


/**
 * Separator splitter.
 */

var separatorSplitter = /[\W_]+(.|$)/g;


/**
 * Un-separate a `string`.
 *
 * @param {String} string
 * @return {String}
 */

function unseparate (string) {
  return string.replace(separatorSplitter, function (m, next) {
    return next ? ' ' + next : '';
  });
}


/**
 * Camelcase splitter.
 */

var camelSplitter = /(.)([A-Z]+)/g;


/**
 * Un-camelcase a `string`.
 *
 * @param {String} string
 * @return {String}
 */

function uncamelize (string) {
  return string.replace(camelSplitter, function (m, previous, uppers) {
    return previous + ' ' + uppers.toLowerCase().split('').join(' ');
  });
}