angular_string_normalization_filters.js

ANGULAR_APP
  .filter('toNoCase', function () {
    var hasSpace = /\s/;
    var hasSeparator = /[\W_]/;
    var separatorSplitter = /[\W_]+(.|$)/g;
    var camelSplitter = /(.)([A-Z]+)/g;
    function unseparate(string) {
      return string.replace(separatorSplitter, function (m, next) {
        return next ? ' ' + next : '';
      });
    }
    function uncamelize(string) {
      return string.replace(camelSplitter, function (m, previous, uppers) {
        return previous + ' ' + uppers.toLowerCase().split('').join(' ');
      });
    }
    return function (str) {
      if (typeof str !== 'string') return '';
      if (hasSpace.test(str)) return str.toLowerCase();
      if (hasSeparator.test(str)) return (unseparate(str) || str).toLowerCase();
      return uncamelize(str).toLowerCase();
    }
  })
  .filter('toSpaceCase', function (toNoCaseFilter) {
    return function (str) {
      return toNoCaseFilter(str).replace(/[\W_]+(.|$)/g, function (matches, match) {
        return match ? ' ' + match : '';
      });
    }
  })
  .filter('toSnakeCase', function (toSpaceCaseFilter) {
    return function (str) {
      return toSpaceCaseFilter(str).replace(/\s/g, '-');
    }
  })
  .filter('toCamelCase', function (toSpaceCaseFilter) {
    return function (str) {
      return toSpaceCaseFilter(str).replace(/\s(\w)/g, function (matches, letter) {
        return letter.toUpperCase();
      });
    }
  })