humps.js

// =========
// = humps =
// =========
// Underscore-to-camelCase converter (and vice versa)
// for strings and object keys

// humps is copyright © 2012+ Dom Christie
// Released under the MIT license.


;(function(global) {

  var _processKeys = function(convert, obj, options) {
    if(!_isObject(obj) || _isDate(obj) || _isRegExp(obj) || _isBoolean(obj) || _isFunction(obj)) {
      return obj;
    }

    var output,
        i = 0,
        l = 0;

    if(_isArray(obj)) {
      output = [];
      for(l=obj.length; i<l; i++) {
        output.push(_processKeys(convert, obj[i], options));
      }
    }
    else {
      output = {};
      for(var key in obj) {
        if(Object.prototype.hasOwnProperty.call(obj, key)) {
          output[convert(key, options)] = _processKeys(convert, obj[key], options);
        }
      }
    }
    return output;
  };

  // String conversion methods

  var separateWords = function(string, options) {
    options = options || {};
    var separator = options.separator || '_';
    var split = options.split || /(?=[A-Z])/;

    return string.split(split).join(separator);
  };

  var camelize = function(string) {
    if (_isNumerical(string)) {
      return string;
    }
    string = string.replace(/[\-_\s]+(.)?/g, function(match, chr) {
      return chr ? chr.toUpperCase() : '';
    });
    // Ensure 1st char is always lowercase
    return string.substr(0, 1).toLowerCase() + string.substr(1);
  };

  var pascalize = function(string) {
    var camelized = camelize(string);
    // Ensure 1st char is always uppercase
    return camelized.substr(0, 1).toUpperCase() + camelized.substr(1);
  };

  var decamelize = function(string, options) {
    return separateWords(string, options).toLowerCase();
  };

  // Utilities
  // Taken from Underscore.js

  var toString = Object.prototype.toString;

  var _isFunction = function(obj) {
    return typeof(obj) === 'function';
  };
  var _isObject = function(obj) {
    return obj === Object(obj);
  };
  var _isArray = function(obj) {
    return toString.call(obj) == '[object Array]';
  };
  var _isDate = function(obj) {
    return toString.call(obj) == '[object Date]';
  };
  var _isRegExp = function(obj) {
    return toString.call(obj) == '[object RegExp]';
  };
  var _isBoolean = function(obj) {
    return toString.call(obj) == '[object Boolean]';
  };

  // Performant way to determine if obj coerces to a number
  var _isNumerical = function(obj) {
    obj = obj - 0;
    return obj === obj;
  };

  // Sets up function which handles processing keys
  // allowing the convert function to be modified by a callback
  var _processor = function(convert, options) {
    var callback = options && 'process' in options ? options.process : options;

    if(typeof(callback) !== 'function') {
      return convert;
    }

    return function(string, options) {
      return callback(string, convert, options);
    }
  };

  var humps = {
    camelize: camelize,
    decamelize: decamelize,
    pascalize: pascalize,
    depascalize: decamelize,
    camelizeKeys: function(object, options) {
      return _processKeys(_processor(camelize, options), object);
    },
    decamelizeKeys: function(object, options) {
      return _processKeys(_processor(decamelize, options), object, options);
    },
    pascalizeKeys: function(object, options) {
      return _processKeys(_processor(pascalize, options), object);
    },
    depascalizeKeys: function () {
      return this.decamelizeKeys.apply(this, arguments);
    }
  };

  if (typeof define === 'function' && define.amd) {
    define(humps);
  } else if (typeof module !== 'undefined' && module.exports) {
    module.exports = humps;
  } else {
    global.humps = humps;
  }

})(this);