jquery-deparam.js

(function(deparam){
    if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
        try {
            var jquery = require('jquery');
        } catch (e) {
        }
        module.exports = deparam(jquery);
    } else if (typeof define === 'function' && define.amd){
        define(['jquery'], function(jquery){
            return deparam(jquery);
        });
    } else {
        var global;
        try {
          global = (false || eval)('this'); // best cross-browser way to determine global for < ES5
        } catch (e) {
          global = window; // fails only if browser (https://developer.mozilla.org/en-US/docs/Web/Security/CSP/CSP_policy_directives)
        }
        global.deparam = deparam(global.jQuery); // assume jQuery is in global namespace
    }
})(function ($) {
    var deparam = function( params, coerce ) {
        var obj = {},
        coerce_types = { 'true': !0, 'false': !1, 'null': null };

        // If params is an empty string or otherwise falsy, return obj.
        if (!params) {
            return obj;
        }

        // Iterate over all name=value pairs.
        params.replace(/\+/g, ' ').split('&').forEach(function(v){
            var param = v.split( '=' ),
            key = decodeURIComponent( param[0] ),
            val,
            cur = obj,
            i = 0,

            // If key is more complex than 'foo', like 'a[]' or 'a[b][c]', split it
            // into its component parts.
            keys = key.split( '][' ),
            keys_last = keys.length - 1;

            // If the first keys part contains [ and the last ends with ], then []
            // are correctly balanced.
            if ( /\[/.test( keys[0] ) && /\]$/.test( keys[ keys_last ] ) ) {
                // Remove the trailing ] from the last keys part.
                keys[ keys_last ] = keys[ keys_last ].replace( /\]$/, '' );

                // Split first keys part into two parts on the [ and add them back onto
                // the beginning of the keys array.
                keys = keys.shift().split('[').concat( keys );

                keys_last = keys.length - 1;
            } else {
                // Basic 'foo' style key.
                keys_last = 0;
            }

            // Are we dealing with a name=value pair, or just a name?
            if ( param.length === 2 ) {
                val = decodeURIComponent( param[1] );

                // Coerce values.
                if ( coerce ) {
                    val = val && !isNaN(val) && ((+val + '') === val) ? +val        // number
                    : val === 'undefined'                       ? undefined         // undefined
                    : coerce_types[val] !== undefined           ? coerce_types[val] // true, false, null
                    : val;                                                          // string
                }

                if ( keys_last ) {
                    // Complex key, build deep object structure based on a few rules:
                    // * The 'cur' pointer starts at the object top-level.
                    // * [] = array push (n is set to array length), [n] = array if n is
                    //   numeric, otherwise object.
                    // * If at the last keys part, set the value.
                    // * For each keys part, if the current level is undefined create an
                    //   object or array based on the type of the next keys part.
                    // * Move the 'cur' pointer to the next level.
                    // * Rinse & repeat.
                    for ( ; i <= keys_last; i++ ) {
                        key = keys[i] === '' ? cur.length : keys[i];
                        cur = cur[key] = i < keys_last
                        ? cur[key] || ( keys[i+1] && isNaN( keys[i+1] ) ? {} : [] )
                        : val;
                    }

                } else {
                    // Simple key, even simpler rules, since only scalars and shallow
                    // arrays are allowed.

                    if ( Object.prototype.toString.call( obj[key] ) === '[object Array]' ) {
                        // val is already an array, so push on the next value.
                        obj[key].push( val );

                    } else if ( {}.hasOwnProperty.call(obj, key) ) {
                        // val isn't an array, but since a second value has been specified,
                        // convert val into an array.
                        obj[key] = [ obj[key], val ];

                    } else {
                        // val is a scalar.
                        obj[key] = val;
                    }
                }

            } else if ( key ) {
                // No value was defined, so set something meaningful.
                obj[key] = coerce
                ? undefined
                : '';
            }
        });

        return obj;
    };
    if ($) {
      $.prototype.deparam = $.deparam = deparam;
    }
    return deparam;
});