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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP version 4.0                                                      |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Herim Vasquez <vasquezh@iro.umontreal.ca>                   |
// |          Bertrand Mansion <bmansion@mamasam.com>                     |
// |          Alexey Borzov <avb@php.net>
// +----------------------------------------------------------------------+
//
// $Id$

require_once('HTML/QuickForm/group.php');
require_once('HTML/QuickForm/select.php');
/**
 * Static utility methods.
 */
require_once 'HTML/QuickForm/utils.php';

/**
 * Class to dynamically create two or more HTML Select elements
 * The first select changes the content of the second select and so on.
 * This element is considered as a group. Selects will be named
 * groupName[0], groupName[1], groupName[2]...
 *
 * @author       Herim Vasquez <vasquezh@iro.umontreal.ca>
 * @author       Bertrand Mansion <bmansion@mamasam.com>
 * @version      1.0
 * @since        PHP4.04pl1
 * @access       public
 */
class HTML_QuickForm_hierselect extends HTML_QuickForm_group
{
    // {{{ properties

/**
     * Options for all the select elements
     *
     * Format is a bit more complex as we need to know which options
     * are related to the ones in the previous select:
     *
     * Ex:
     * // first select
     * $select1[0] = 'Pop';
     * $select1[1] = 'Classical';
     * $select1[2] = 'Funeral doom';
     *
     * // second select
     * $select2[0][0] = 'Red Hot Chil Peppers';
     * $select2[0][1] = 'The Pixies';
     * $select2[1][0] = 'Wagner';
     * $select2[1][1] = 'Strauss';
     * $select2[2][0] = 'Pantheist';
     * $select2[2][1] = 'Skepticism';
     *
     * // If only need two selects
     * //     - and using the depracated functions
     * $sel =& $form->addElement('hierselect', 'cds', 'Choose CD:');
     * $sel->setMainOptions($select1);
     * $sel->setSecOptions($select2);
     *
     * //     - and using the new setOptions function
     * $sel =& $form->addElement('hierselect', 'cds', 'Choose CD:');
     * $sel->setOptions(array($select1, $select2));
     *
     * // If you have a third select with prices for the cds
     * $select3[0][0][0] = '15.00$';
     * $select3[0][0][1] = '17.00$';
     * etc
     *
     * // You can now use
     * $sel =& $form->addElement('hierselect', 'cds', 'Choose CD:');
     * $sel->setOptions(array($select1, $select2, $select3));
     *
     * @var       array
     * @access    private
     */
    var $_options = array();

/**
     * Number of select elements on this group
     *
     * @var       int
     * @access    private
     */
    var $_nbElements = 0;

/**
     * The javascript used to set and change the options
     *
     * @var       string
     * @access    private
     */
    var $_js = '';

// }}}
    // {{{ constructor

/**
     * Class constructor
     *
     * @param     string    $elementName    (optional)Input field name attribute
     * @param     string    $elementLabel   (optional)Input field label in form
     * @param     mixed     $attributes     (optional)Either a typical HTML attribute string
     *                                      or an associative array. Date format is passed along the attributes.
     * @param     mixed     $separator      (optional)Use a string for one separator,
     *                                      use an array to alternate the separators.
     * @access    public
     * @return    void
     */
    public function __construct($elementName=null, $elementLabel=null, $attributes=null, $separator=null) {
        // TODO MDL-52313 Replace with the call to parent::__construct().
        HTML_QuickForm_element::__construct($elementName, $elementLabel, $attributes);
        $this->_persistantFreeze = true;
        if (isset($separator)) {
            $this->_separator = $separator;
        }
        $this->_type = 'hierselect';
        $this->_appendName = true;
    } //end constructor

/**
     * Old syntax of class constructor. Deprecated in PHP7.
     *
     * @deprecated since Moodle 3.1
     */
    public function HTML_QuickForm_hierselect($elementName=null, $elementLabel=null, $attributes=null, $separator=null) {
        debugging('Use of class name as constructor is deprecated', DEBUG_DEVELOPER);
        self::__construct($elementName, $elementLabel, $attributes, $separator);
    }

// }}}
    // {{{ setOptions()

/**
     * Initialize the array structure containing the options for each select element.
     * Call the functions that actually do the magic.
     *
     * @param     array    $options    Array of options defining each element
     *
     * @access    public
     * @return    void
     */
    function setOptions($options)
    {
        $this->_options = $options;

if (empty($this->_elements)) {
            $this->_nbElements = count($this->_options);
            $this->_createElements();
        } else {
            // setDefaults has probably been called before this function
            // check if all elements have been created
            $totalNbElements = count($this->_options);
            for ($i = $this->_nbElements; $i < $totalNbElements; $i ++) {
                $this->_elements[] = new HTML_QuickForm_select($i, null, array(), $this->getAttributes());
                $this->_nbElements++;
            }
        }

$this->_setOptions();
    } // end func setMainOptions

// }}}
    // {{{ setMainOptions()

/**
     * Sets the options for the first select element. Deprecated. setOptions() should be used.
     *
     * @param     array     $array    Options for the first select element
     *
     * @access    public
     * @deprecated          Deprecated since release 3.2.2
     * @return    void
     */
    function setMainOptions($array)
    {
        $this->_options[0] = $array;

if (empty($this->_elements)) {
            $this->_nbElements = 2;
            $this->_createElements();
        }
    } // end func setMainOptions

// }}}
    // {{{ setSecOptions()

/**
     * Sets the options for the second select element. Deprecated. setOptions() should be used.
     * The main _options array is initialized and the _setOptions function is called.
     *
     * @param     array     $array    Options for the second select element
     *
     * @access    public
     * @deprecated          Deprecated since release 3.2.2
     * @return    void
     */
    function setSecOptions($array)
    {
        $this->_options[1] = $array;

if (empty($this->_elements)) {
            $this->_nbElements = 2;
            $this->_createElements();
        } else {
            // setDefaults has probably been called before this function
            // check if all elements have been created
            $totalNbElements = 2;
            for ($i = $this->_nbElements; $i < $totalNbElements; $i ++) {
                $this->_elements[] = new HTML_QuickForm_select($i, null, array(), $this->getAttributes());
                $this->_nbElements++;
            }
        }

$this->_setOptions();
    } // end func setSecOptions

// }}}
    // {{{ _setOptions()

/**
     * Sets the options for each select element
     *
     * @access    private
     * @return    void
     */
    function _setOptions()
    {
        $arrayKeys = [];
        foreach (array_keys($this->_elements) AS $key) {
            if (isset($this->_options[$key])) {
                if ((empty($arrayKeys)) || HTML_QuickForm_utils::recursiveIsset($this->_options[$key], $arrayKeys)) {
                    $array = empty($arrayKeys) ? $this->_options[$key] : HTML_QuickForm_utils::recursiveValue($this->_options[$key], $arrayKeys);
                    if (is_array($array)) {
                        $select =& $this->_elements[$key];
                        $select->_options = array();
                        $select->loadArray($array);
                        $value = is_array($v = $select->getValue()) ? $v[0] : key($array);
                        $arrayKeys[] = $value;
                    }
                }
            }
        }
    } // end func _setOptions

// }}}
    // {{{ setValue()

/**
     * Sets values for group's elements
     *
     * @param     array     $value    An array of 2 or more values, for the first,
     *                                the second, the third etc. select
     *
     * @access    public
     * @return    void
     */
    function setValue($value)
    {
        // fix for bug #6766. Hope this doesn't break anything more
        // after bug #7961. Forgot that _nbElements was used in
        // _createElements() called in several places...
        $this->_nbElements = max($this->_nbElements, count($value));
        parent::setValue($value);
        $this->_setOptions();
    } // end func setValue

// }}}
    // {{{ _createElements()

/**
     * Creates all the elements for the group
     *
     * @access    private
     * @return    void
     */
    function _createElements()
    {
        for ($i = 0; $i < $this->_nbElements; $i++) {
            $this->_elements[] = new HTML_QuickForm_select($i, null, array(), $this->getAttributes());
        }
    } // end func _createElements

// }}}
    // {{{ toHtml()

function toHtml()
    {
        $this->_js = '';
        if (!$this->_flagFrozen) {
            // set the onchange attribute for each element except last
            $keys     = array_keys($this->_elements);
            $onChange = array();
            for ($i = 0; $i < count($keys) - 1; $i++) {
                $select =& $this->_elements[$keys[$i]];
                $onChange[$i] = $select->getAttribute('onchange');
                $select->updateAttributes(
                    array('onchange' => '_hs_swapOptions(this.form, \'' . $this->_escapeString($this->getName()) . '\', ' . $keys[$i] . ');' . $onChange[$i])
                );
            }

// create the js function to call
            if (!defined('HTML_QUICKFORM_HIERSELECT_EXISTS')) {
                $this->_js .= <<<JAVASCRIPT
function _hs_findOptions(ary, keys)
{
    var key = keys.shift();
    if (!key in ary) {
        return {};
    } else if (0 == keys.length) {
        return ary[key];
    } else {
        return _hs_findOptions(ary[key], keys);
    }
}

function _hs_findSelect(form, groupName, selectIndex)
{
    if (groupName+'['+ selectIndex +']' in form) {
        return form[groupName+'['+ selectIndex +']'];
    } else {
        return form[groupName+'['+ selectIndex +'][]'];
    }
}

function _hs_unescapeEntities(str)
{
    var div = document.createElement('div');
    div.innerHTML = str;
    return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
}

function _hs_replaceOptions(ctl, optionList)
{
    var j = 0;
    ctl.options.length = 0;
    for (i in optionList) {
        var optionText = (-1 == optionList[i].indexOf('&'))? optionList[i]: _hs_unescapeEntities(optionList[i]);
        ctl.options[j++] = new Option(optionText, i, false, false);
    }
}

function _hs_swapOptions(form, groupName, selectIndex)
{
    var hsValue = [];
    for (var i = 0; i <= selectIndex; i++) {
        hsValue[i] = _hs_findSelect(form, groupName, i).value;
    }

_hs_replaceOptions(_hs_findSelect(form, groupName, selectIndex + 1),
                       _hs_findOptions(_hs_options[groupName][selectIndex], hsValue));
    if (selectIndex + 1 < _hs_options[groupName].length) {
        _hs_swapOptions(form, groupName, selectIndex + 1);
    }
}

function _hs_setupOnReset(form, groupNames)
{
    setTimeout(function() { _hs_onReset(form, groupNames); }, 25);
}

if (_hs_prevOnload) {
        _hs_prevOnload();
    }
}

var _hs_prevOnload = null;
if (window.onload) {
    _hs_prevOnload = window.onload;
}
window.onload = _hs_onReload;

var _hs_options = {};
var _hs_defaults = {};

JAVASCRIPT;
                define('HTML_QUICKFORM_HIERSELECT_EXISTS', true);
            }
            // option lists
            $jsParts = array();
            for ($i = 1; $i < $this->_nbElements; $i++) {
                $jsParts[] = $this->_convertArrayToJavascript($this->_options[$i]);
            }
            $this->_js .= "\n_hs_options['" . $this->_escapeString($this->getName()) . "'] = [\n" .
                          implode(",\n", $jsParts) .
                          "\n];\n";
            // default value; if we don't actually have any values yet just use
            // the first option (for single selects) or empty array (for multiple)
            $values = array();
            foreach (array_keys($this->_elements) as $key) {
                if (is_array($v = $this->_elements[$key]->getValue())) {
                    $values[] = count($v) > 1? $v: $v[0];
                } else {
                    // XXX: accessing the supposedly private _options array
                    $values[] = $this->_elements[$key]->getMultiple() || empty($this->_elements[$key]->_options[0])?
                                array():
                                $this->_elements[$key]->_options[0]['attr']['value'];
                }
            }
            $this->_js .= "_hs_defaults['" . $this->_escapeString($this->getName()) . "'] = " .
                          $this->_convertArrayToJavascript($values, false) . ";\n";
        }
        include_once('HTML/QuickForm/Renderer/Default.php');
        $renderer = new HTML_QuickForm_Renderer_Default();
        $renderer->setElementTemplate('{element}');
        parent::accept($renderer);

if (!empty($onChange)) {
            $keys     = array_keys($this->_elements);
            for ($i = 0; $i < count($keys) - 1; $i++) {
                $this->_elements[$keys[$i]]->updateAttributes(array('onchange' => $onChange[$i]));
            }
        }
        return (empty($this->_js)? '': "<script type=\"text/javascript\">\n//<![CDATA[\n" . $this->_js . "//]]>\n</script>") .
               $renderer->toHtml();
    } // end func toHtml

// }}}
    // {{{ accept()

function accept(&$renderer, $required = false, $error = null)
    {
        $renderer->renderElement($this, $required, $error);
    } // end func accept

// }}}
    // {{{ onQuickFormEvent()

// }}}
    // {{{ _convertArrayToJavascript()

/**
    * Converts PHP array to its Javascript analog
    *
    * @access private
    * @param  array     PHP array to convert
    * @param  bool      Generate Javascript object literal (default, works like PHP's associative array) or array literal
    * @return string    Javascript representation of the value
    */
    function _convertArrayToJavascript($array, $assoc = true)
    {
        if (!is_array($array)) {
            return $this->_convertScalarToJavascript($array);
        } else {
            $items = array();
            foreach ($array as $key => $val) {
                $item = $assoc? "'" . $this->_escapeString($key) . "': ": '';
                if (is_array($val)) {
                    $item .= $this->_convertArrayToJavascript($val, $assoc);
                } else {
                    $item .= $this->_convertScalarToJavascript($val);
                }
                $items[] = $item;
            }
        }
        $js = implode(', ', $items);
        return $assoc? '{ ' . $js . ' }': '[' . $js . ']';
    }

// }}}
    // {{{ _convertScalarToJavascript()

/**
    * Converts PHP's scalar value to its Javascript analog
    *
    * @access private
    * @param  mixed     PHP value to convert
    * @return string    Javascript representation of the value
    */
    function _convertScalarToJavascript($val)
    {
        if (is_bool($val)) {
            return $val ? 'true' : 'false';
        } elseif (is_int($val) || is_double($val)) {
            return $val;
        } elseif (is_string($val)) {
            return "'" . $this->_escapeString($val) . "'";
        } elseif (is_null($val)) {
            return 'null';
        } else {
            // don't bother
            return '{}';
        }
    }

// }}}
    // {{{ _escapeString()

/**
    * Quotes the string so that it can be used in Javascript string constants
    *
    * @access private
    * @param  string
    * @return string
    */
    function _escapeString($str)
    {
        return strtr($str,array(
            "\r"    => '\r',
            "\n"    => '\n',
            "\t"    => '\t',
            "'"     => "\\'",
            '"'     => '\"',
            '\\'    => '\\\\'
        ));
    }

// }}}
} // end class HTML_QuickForm_hierselect
?>

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