1:   2:   3:   4:   5:   6:   7:   8:   9:  10:  11:  12:  13:  14:  15:  16:  17:  18:  19:  20:  21:  22:  23:  24:  25:  26:  27:  28:  29:  30:  31:  32:  33:  34:  35:  36:  37:  38:  39:  40:  41:  42:  43:  44:  45:  46:  47:  48:  49:  50:  51:  52:  53:  54:  55:  56:  57:  58:  59:  60:  61:  62:  63:  64:  65:  66:  67:  68:  69:  70:  71:  72:  73:  74:  75:  76:  77:  78:  79:  80:  81:  82:  83:  84:  85:  86:  87:  88:  89:  90:  91:  92:  93:  94:  95:  96:  97:  98:  99: 100: 101: 102: 103: 104: 105: 106: 107: 108: 109: 110: 111: 

<?php
namespace Nethgui\Renderer;

/*
 * Copyright (C) 2011 Nethesis S.r.l.
 * 
 * This script is part of NethServer.
 * 
 * NethServer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * NethServer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with NethServer.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Transform a view in a JSON string
 * 
 * @author Davide Principi <davide.principi@nethesis.it>
 * @since 1.0
 */
class Json extends AbstractRenderer
{
    private function deepWalk(&$events)
    {
        // iterative tree walk - $q is the node queue:
        $q = array($this->view);

        while ($view = array_shift($q)) {

            foreach ($view as $offset => $value) {

                $eventTarget = $view->getClientEventTarget($offset);

                if ($value instanceof \Nethgui\View\ViewInterface) {
                    // honor the ViewInterface contract: if template is FALSE
                    // skip rendering, otherwise enqueue:
                    if ($value->getTemplate() !== FALSE) {
                        $q[] = $value;
                    }
                    continue;
                }

                if ($value instanceof \Traversable) {
                    $eventData = $this->traversableToArray($value);
                } else {
                    $eventData = $value;
                }

                $events[] = array($eventTarget, $eventData);
            }
        }
    }

    /**
     * Convert a \Traversable object to a PHP array
     * @param \Traversable $value
     * @return array
     */
    function traversableToArray(\Traversable $value)
    {
        $a = array();
        foreach ($value as $k => $v) {
            if ($v instanceof \Traversable) {
                $v = $this->traversableToArray($v);
            }
            $a[$k] = $v;
        }
        return $a;
    }

    public function render()
    {
        $events = array();
        $output = array();

        $this->deepWalk($events);

        if (count($events) > 0) {
            $output = $events;
        }
        
        $commands = $this->getCommandList();
        if (count($commands) > 0) {
            $output[] = array('__COMMANDS__', $commands);            
        }

        $output[] = array('__STATE__', md5(json_encode($output)));

        return json_encode($output);
    }

    public function getCharset()
    {
        return 'UTF-8';
    }

    public function getContentType()
    {
        return 'application/json';
    }

}