cubesystems/releaf

// constructor
function UrlBuilder( params )
{
    if( params === undefined )
    {
        params = {};
    }
    var keepCurrentQuery = true;
    if( params === false || params.baseUrl !== undefined )
    {
        keepCurrentQuery = false;
    }
    if( typeof params === 'string' )
    {
        params = { baseUrl: params };
    }
    // setup members
    this.path = '';
    this.query = {};
    // get url
    var baseUrl = params.baseUrl || location.href;
    // remove anchor
    baseUrl = baseUrl.split( '#' ).shift();
    // split url
    var urlParts = baseUrl.split( '?' );
    this.path = urlParts.shift();
    if( keepCurrentQuery && urlParts.length > 0 )
    {
        var queryParts = urlParts.shift().split( '&' );
        for( var i = 0; i < queryParts.length; i++ )
        {
            if( queryParts[ i ].length > 0 )
            {
                var value;
                var variable = queryParts[ i ].split( '=' );
                var name = variable.shift();

                if( variable.length > 0 )
                {
                    value = decodeURIComponent( variable.shift() );
                }
                else
                {
                    value = '';
                }

                if( decodeURIComponent( name ).substr( decodeURIComponent( name ).length - 2, 2 ) === '[]' )
                {
                    name = decodeURIComponent( name );
                }

                if( name.substr( name.length - 2, 2 ) === '[]' )
                {
                    name = name.substr( 0, name.length - 2 );
                    if( this.query[ name ] === undefined || !(this.query[ name ] instanceof Array) )
                    {
                        this.query[ name ] = [];
                    }
                    this.query[ name ].push( value );
                }
                else
                {
                    this.query[ name ] = value;
                }
            }
        }
    }
    if( params.keep !== undefined && params.keep instanceof Array )
    {
        var filteredQuery = {};
        for( var a = 0; a < params.keep.length; a++ )
        {
            if( this.query[ params.keep[a] ] !== undefined )
            {
                filteredQuery[ params.keep[a] ] = this.query[ params.keep[a] ];
            }
        }
        this.query = filteredQuery;
    }
}

UrlBuilder.prototype.add = function( params, value )
{
    if( params instanceof Array )
    {
        for( var i = 0; i < params.length; i++ )
        {
            if( params[ i ].name !== undefined && params[ i ].value !== undefined )
            {
                var name = params[ i ].name;
                if( name.substr( name.length - 2, 2 ) === '[]' )
                {
                    name = name.substr( 0, name.length - 2 );
                    if( this.query[ name ] === undefined || !(this.query[ name ] instanceof Array) )
                    {
                        this.query[ name ] = [];
                    }
                    this.query[ name ].push( params[ i ].value );
                }
                else
                {
                    this.query[ params[ i ].name ] = params[ i ].value;
                }
            }
        }
    }
    else if( params instanceof Object )
    {
        for( var a in params )
        {
            if (params.hasOwnProperty(a))
            {
                this.query[ a ] = params[ a ];
            }
        }
    }
    else if( typeof params === 'string' )
    {
        if( value === undefined )
        {
            var temp = new UrlBuilder( '?' + params );
            for( var b in temp.query )
            {
                if (temp.query.hasOwnProperty(b))
                {
                    this.query[ b ] = temp.query[b];
                }
            }
        }
        else
        {
            this.query[ params ] = value;
        }
    }
    return this;
};

UrlBuilder.prototype.removeAll = function( preserveParams )
{
    for( var i in this.query )
    {
        if( preserveParams === undefined || jQuery.inArray(i, preserveParams) === -1 )
        {
            this.remove(i);
        }
    }
    return this;
};

UrlBuilder.prototype.remove = function( name )
{
    delete this.query[ name ];
    return this;
};

UrlBuilder.prototype.get = function( name )
{
    if( this.query[ name ] !== undefined )
    {
        return this.query[ name ];
    }
    return null;
};

UrlBuilder.prototype.getUrl = function()
{
    var query = '';
    var isFirst = true;
    for( var i in this.query )
    {
        if(this.query.hasOwnProperty(i))
        {
            if( !isFirst )
            {
                query += '&';
            }
            else
            {
                isFirst = false;
            }
            if( this.query[ i ] instanceof Array )
            {
                query += i + '[]=' + this.query[ i ].map(encodeURIComponent).join( '&' + i + '[]=' );
            }
            else
            {
                query += i + '=' + encodeURIComponent(this.query[ i ]);
            }
        }
    }

    return this.path + '?' + query;
};