/**
 * Functions for manipulating web forms.
 *
 * @author David I. Lehn <dlehn@digitalbazaar.com>
 * @author Dave Longley
 * @author Mike Johnson
 *
 * Copyright (c) 2011-2014 Digital Bazaar, Inc. All rights reserved.
 */
var forge = require('./forge');

/* Form API */
var form = module.exports = forge.form = forge.form || {};

(function($) {

/**
 * Regex for parsing a single name property (handles array brackets).
 */
var _regex = /([^\[]*?)\[(.*?)\]/g;

/**
 * Parses a single name property into an array with the name and any
 * array indices.
 *
 * @param name the name to parse.
 *
 * @return the array of the name and its array indices in order.
 */
var _parseName = function(name) {
  var rval = [];

  var matches;
  while(!!(matches = _regex.exec(name))) {
    if(matches[1].length > 0) {
      rval.push(matches[1]);
    }
    if(matches.length >= 2) {
      rval.push(matches[2]);
    }
  }
  if(rval.length === 0) {
    rval.push(name);
  }

  return rval;
};

/**
 * Adds a field from the given form to the given object.
 *
 * @param obj the object.
 * @param names the field as an array of object property names.
 * @param value the value of the field.
 * @param dict a dictionary of names to replace.
 */
var _addField = function(obj, names, value, dict) {
  // combine array names that fall within square brackets
  var tmp = [];
  for(var i = 0; i < names.length; ++i) {
    // check name for starting square bracket but no ending one
    var name = names[i];
    if(name.indexOf('[') !== -1 && name.indexOf(']') === -1 &&
      i < names.length - 1) {
      do {
        name += '.' + names[++i];
      } while(i < names.length - 1 && names[i].indexOf(']') === -1);
    }
    tmp.push(name);
  }
  names = tmp;

  // split out array indexes
  var tmp = [];
  $.each(names, function(n, name) {
    tmp = tmp.concat(_parseName(name));
  });
  names = tmp;

  // iterate over object property names until value is set
  $.each(names, function(n, name) {
    // do dictionary name replacement
    if(dict && name.length !== 0 && name in dict) {
       name = dict[name];
    }

    // blank name indicates appending to an array, set name to
    // new last index of array
    if(name.length === 0) {
       name = obj.length;
    }

    // value already exists, append value
    if(obj[name]) {
      // last name in the field
      if(n == names.length - 1) {
        // more than one value, so convert into an array
        if(!$.isArray(obj[name])) {
          obj[name] = [obj[name]];
        }
        obj[name].push(value);
      } else {
        // not last name, go deeper into object
        obj = obj[name];
      }
    } else if(n == names.length - 1) {
      // new value, last name in the field, set value
      obj[name] = value;
    } else {
      // new value, not last name, go deeper
      // get next name
      var next = names[n + 1];

      // blank next value indicates array-appending, so create array
      if(next.length === 0) {
         obj[name] = [];
      } else {
        // if next name is a number create an array, otherwise a map
        var isNum = ((next - 0) == next && next.length > 0);
        obj[name] = isNum ? [] : {};
      }
      obj = obj[name];
    }
  });
};

/**
 * Serializes a form to a JSON object. Object properties will be separated
 * using the given separator (defaults to '.') and by square brackets.
 *
 * @param input the jquery form to serialize.
 * @param sep the object-property separator (defaults to '.').
 * @param dict a dictionary of names to replace (name=replace).
 *
 * @return the JSON-serialized form.
 */
form.serialize = function(input, sep, dict) {
  var rval = {};

  // add all fields in the form to the object
  sep = sep || '.';
  $.each(input.serializeArray(), function() {
    _addField(rval, this.name.split(sep), this.value || '', dict);
  });

  return rval;
};

})(jQuery);
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