source: inc/admin/class.dc.form.php @ 1491:2b9253624dbe

<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of Dotclear 2.
#
# Copyright (c) 2003-2011 Olivier Meunier & Association Dotclear
# Licensed under the GPL version 2.0 license.
# See LICENSE file or
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# -- END LICENSE BLOCK -----------------------------------------
if (!defined('DC_RC_PATH')) { return; }

/**
* dcFormNode Twig Node for Form handling
*
* @uses     Twig_Node
*
*/
class dcFormNode extends Twig_Node
{
     public function __construct($name,Twig_NodeInterface $body,$attr,$lineno,$tag=null)
     {
          parent::__construct(array('body' => $body),array('name' => $name, 'attr' => $attr),$lineno,$tag);
     }
     
     /**
     * Compiles the node to PHP.
     *
     * @param Twig_Compiler A Twig_Compiler instance
     */
     public function compile(Twig_Compiler $compiler)
     {
          $compiler
               ->addDebugInfo($this);
          $compiler
               ->write("\$context['dc_form']->beginForm(")
               ->subcompile($this->getAttribute('name'));
          if ($this->getAttribute('attr') !== null) {
               $compiler
                    ->write(',')
                    ->subcompile($this->getAttribute('attr'));
          }
          $compiler
               ->write(");\n");
          $compiler
               ->subcompile($this->getNode('body'))
               ->write("\$context['dc_form']->renderHiddenWidgets();\n")
               ->write("\$context['dc_form']->endForm();\n")
          ;
     }
}

/**
 * Template form token parser
 */
class dcFormTokenParser extends Twig_TokenParser
{
    /**
     * parse - parses form tag
     * General syntax is :
     *  {% form 'formname' %}
     *  ... {{ form_field (...)}}
     *  {% endform %}
     * Specific attributes can be passed to the form, enabling to set
     * attributes to the form template :
     * {% form 'formname' with {'id':'myform'} %}
     * @param mixed \Twig_Token Description.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function parse(Twig_Token $token)
     {
          $lineno = $token->getLine();
          $stream = $this->parser->getStream();
          $name = $this->parser->getExpressionParser()->parseExpression();
          $attr = null;
          /* parse optional context */
          if ($stream->test(Twig_Token::NAME_TYPE, 'with')) {
               $stream->next();
               $attr = $this->parser->getExpressionParser()->parseExpression();
          }
          $stream->expect(Twig_Token::BLOCK_END_TYPE);
          $body = $this->parser->subparse(array($this,'decideBlockEnd'),true);
          $stream->expect(Twig_Token::BLOCK_END_TYPE);

          return new dcFormNode($name,$body,$attr,$token->getLine(),$this->getTag());
     }

     public function decideBlockEnd(Twig_Token $token)
     {
          return $token->test('endform');
     }

     public function getTag()
     {
          return 'form';
     }
}

/**
 * Template form extension
 */
class dcFormExtension extends Twig_Extension
{
     protected $template;
     protected $tpl;
     protected $core;
     protected $twig;
     protected $forms;
     protected $currentForm;
     protected $blocks;

     public function __construct($core)
     {
          $this->core = $core;
          $this->tpl = array('@forms/form_layout.html.twig');
          $this->forms = array();
          $this->blocks = array();
          $this->currentForm = null;
     }

     public function initRuntime(Twig_Environment $environment)
     {
          $this->twig = $environment;
          $this->twig->getLoader()->addPath(dirname(__FILE__).'/default-templates/forms','forms');
          foreach ($this->tpl as $tpl) {
               $this->template = $this->twig->loadTemplate($tpl);
               $this->blocks = array_merge($this->blocks,$this->template->getBlocks());
          }
     }

     public function addTemplate($tpl) {
          $this->tpl[]=$tpl;
          if (isset($this->twig)) {
               $this->template = $this->twig->loadTemplate($tpl);
               $this->blocks = array_merge($this->blocks,$this->template->getBlocks());
          }
     }

     public function getGlobals()
     {
          return array('dc_form' => $this);
     }

     public function getFunctions()
     {
          return array(
               new Twig_SimpleFunction(
                    'widget',
                    array($this,'renderWidget'),
                    array('is_safe' => array('html'))
               ),
               new Twig_SimpleFunction(
                    'haswidget',
                    array($this,'hasWidget'),
                    array('is_safe' => array('html'))
               ),
               new Twig_SimpleFunction(
                    'form_field',
                    array($this,'renderField'),
                    array('is_safe' => array('html'))
               ),
               new Twig_SimpleFunction(
                    'form_field_attr',
                    array($this,'getFieldAttributes'),
                    array('is_safe' => array('html'))
               ),
               new Twig_SimpleFunction(
                    '_form_is_choice_group',
                    array($this,'isChoiceGroup'),
                    array('is_safe' => array('html'))
               ),
               new Twig_SimpleFunction(
                    '_form_is_choice_selected',
                    array($this,'isChoiceSelected'),
                    array('is_safe' => array('html'))
               )
          );
     }

    /**
     * isChoiceGroup - binding for twig function "_form_is_choice_group"
     *                        returns whether a choice is a group or not
     * @param mixed $choice the choice.
     *
     * @access public
     *
     * @return boolean true is choice is a group (optgroup).
     */
     public function isChoiceGroup($choice)
     {
          return is_array($choice);
     }

    /**
     * isChoiceSelected - binding for twig function "_form_is_choice_selected"
     *                        returns whether current choice matches a value or not
     * @param mixed $choice the choixe.
     * @param mixed $value  the value to check matching.
     *
     * @access public
     *
     * @return boolean if choice is matching the value.
     */
     public function isChoiceSelected($choice,$value)
     {
          return $choice == $value;
     }

    /**
     * getTokenParsers returns token parsers
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function getTokenParsers()
     {
          return array(new dcFormTokenParser());
     }

    /**
     * hasWidget - binding for twig "haswidget" function
     *    returns whether a widget is defined or not
     * 
     * @param mixed $name the widget name.
     *
     * @access public
     *
     * @return boolean true if the widget exists.
     */
     public function hasWidget($name) {
          return isset($this->blocks[$name]);
     }

    /**
     * renderWidget - binding for 'widget' twig function
     * behaves exactly like "block" function, except that a context
     * can be passed to the function
     * 
     * @param mixed $name the widget (block) name to render.
     * @param mixed $attr Description the context for this block.
     *
     *
     * @return mixed Value.
     */
     public function renderWidget($name,$attr) {
          if (!isset($this->blocks[$name]))
               return '';
          echo $this->template->renderBlock(
               $name,
               $attr,
               $this->blocks
          );
     }

    /**
     * getCurrentForm - returns current form if called within a {% form %} tag
     *
     * @access public
     *
     * @return string the current form.
     */
     public function getCurrentForm() {
          return $this->currentForm;
     }

    /**
     * renderField - binding for 'form_field' twig function; renders a field
     *
     * @param mixed $name       field name as defined on php side.
     * @param array $attributes html attributes for field (ex : class, ...).
     * @param array $extra      extra attributes that may be template specific.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function renderField($name,$attributes=array(),$extra=array())
     {
          $field = $this->currentForm->getField($name);
          if ($field) {
               $attr = $field->getAttributes($attributes);
               if (isset($attr['attr'])) {
                    $attr['attr'] = array_merge($attr['attr'],$attributes);
               } else {
                    $attr['attr'] = $attributes;
               }
               $this->renderWidget(
               $field->getWidgetBlock(),
                    array_merge(
                         $attr,
                         $extra
                    )
               );
          }
     }

    /**
     * getFieldAttributes - binding for 'form_field_attr' twig function; returns all field attributes
     *
     * @param mixed $name       field name as defined on php side.
     * @param mixed $name       the attribute name, null to grab all attributes as an array
     *
     * @access public
     *
     * @return array the field attributes
     */   
     public function getFieldAttributes($name,$attr=null)
     {
          $field = $this->currentForm->getField($name);
          if ($field) {
               $a = $field->getAttributes();
               if ($attr !== null) {
                    if (isset($a[$attr])) {
                         return $a[$attr];
                    } else {
                         return null;
                    }
               } else {
                    return $field->getAttributes();
               }
          } else {
               return array();
          }
     }

    /**
     * renderHiddenWidgets -- renders all form hidden fields
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function renderHiddenWidgets()
     {
          foreach ($this->currentForm->getHiddenFields() as $h) {
               $this->renderField($h->getName());
          }
     }

     public function getName()
     {
          return 'dc_form';
     }

    /**
     * addForm -- registers a new form
     *
     * @param mixed \dcForm Description.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function addForm(dcForm $form)
     {
          $this->forms[$form->getName()] = $form;
     }

    /**
     * beginForm -- displays form beginning
     * 
     * @param mixed $name form name.
     * @param array $attr extra attributes.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function beginForm($name,$attr=array())
     {
          if (isset($this->forms[$name])) {
               $this->currentForm = $this->forms[$name];
               $this->currentForm->begin($attr);
          }
          else {
               throw new Twig_Error_Runtime(sprintf(
                    'Form "%s" does not exist',
                    $name
               ));
          }
     }

    /**
     * endForm -- displays form ending
     * 
     * @access public
     *
     * @return mixed Value.
     */
     public function endForm()
     {
          $this->currentForm->end();
          $this->currentForm = null;
     }
}

/**
 * Template form exception
 */
class InvalidFieldException extends Exception {
}

/**
* dcForm - Template form
*
*/
class dcForm
{
     /** @var string form id */
     protected $id;
     /** @var string form name */
     protected $name;
     /** @var dcCore dcCore instance */
     protected $core;
     /** @var string form action */
     protected $action;
     /** @var array(dcField) list of form fields */
     protected $fields;
     /** @var string form method (GET/POST) */
     protected $method;
     /** @var array(dcField) list of submit fields */
     protected $submitfields;
     /** @var array(dcField) list of hidden fields */
     protected $hiddenfields;
     /** @var array(dcField) list of form errors */
     protected $errors;
     /** @var array() list of form properties */
     protected $properties;
     
     
    /**
     * Class constructor
     * 
     * @param mixed  $core   dotclear core
     * @param mixed  $name   form name - can be an array (name,id)
     * @param mixed  $action form action
     * @param string $method form method ('GET' or 'POST')
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function __construct($core,$name,$action,$method='POST')
     {
          $this->core = $core;
          $this->setNID($name);
          $this->method = $method;
          $this->action = $action;
          $this->fields = array();
          $this->core->tpl->getExtension('dc_form')->addForm($this);
          $this->submitfields = array();
          $this->hiddenfields = array();
          $this->errors = array();
          $this->properties = array();
          if ($method == 'POST') {
               $this->addNonce();
          }
     }

     
    /**
     * setProperty - sets form property
     * 
     * @param string $name the property name.
     * @param mixed $value the property value.
     *
     * @access public
     */
     public function setProperty($prop,$value) {
          $this->properties[$prop]=$value;
     }
     
    /**
     * getProperty - gets form property
     * 
     * @param string $name the property name.
      *
     * @return mixed the property value, null if no property found.
     * @access public
     */   
     public function getProperty($prop) {
          if (isset($this->properties[$prop])) {
               return $this->properties[$prop];
          } else {
               return null;
          }
     }
    /**
     * addTemplate - Adds a template file to enrich form fields
     * 
     * @param string $t the template file.
     *
     * @access public
     */
     public function addTemplate($t) {
          $this->core->tpl->getExtension('dc_form')->addTemplate($t);
     }

    /**
     * addNonce -- adds dc nonce to form fields
     *
     * @access protected
     *
     * @return nothing
     */
     protected function addNonce()
     {
          $this->addField(
               new dcFieldHidden(array('xd_check'),
               $this->core->getNonce())
          );
     }

    /**
     * Defines Name & ID from field
     *
     * @param mixed $nid either an array (name, id) or a string
     *                   (name only, id will be set to null).
     *
     * @access protected
     *
     * @return nothing.
     */
     protected function setNID($nid)
     {
          if (is_array($nid)) {
               $this->name = $nid[0];
               $this->id = !empty($nid[1]) ? $nid[1] : null;
          }
          else {
               $this->id = null;
               $this->name = $nid;
          }
     }

    /**
     * getContext - returns form context (to fill-in twig context for instance),
     *                   if any
     *
     * @access public
     *
     * @return array the form context.
     */
     public function getContext() {
          return array();
     }


    /**
     * Returns form name
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function getName()
     {
          return $this->name;
     }

    /**
     * getErrors - returns form errors
     *
     * @access public
     *
     * @return array the list of errors.
     */
     public function getErrors()
     {
          return $this->errors;
     }

    /**
     * addField - adds a new field to form
     *
     * @param mixed \dcField the field to add.
     *
     * @access public
     *
     * @return dcForm the form instance (therefore addField can be chained)
     */
     public function addField(dcField $f)
     {
          if ($f instanceof dcFieldAction) {
               $this->submitfields[$f->getName()] = $f;
          }
          if ($f instanceof dcFieldHidden) {
               $this->hiddenfields[$f->getName()] = $f;
          }
          $this->fields[$f->getName()] = $f;

          return $this;
     }

    /**
     * getField - retrieves a field form form
     *
     * @param string the field name
     *
     * @access public
     *
     * @return dcForm the requested field
     */   
      public function getField($name) {
          if (isset($this->fields[$name])) {
               return $this->fields[$name];
          } else {
               return null;
          }
     }
     
    /**
     * removeField - removes a field
     *
     * @param mixed \dcField the field to remove.
     *
     * @access public
     *
     * @return dcForm the form instance (therefore addField can be chained)
     */
     public function removeField(dcField $f) {
          $n = $f->getName();
          if (isset($this->fields[$n])){
               unset($this->fields[$n]);
          }
          return $this;
     }


    /**
     * renameField - renames a field
     *
     * @param mixed $field   the field to rename.
     * @param mixed $newname new field name
     *
     * @access public
     *
     *
     * @return dcForm the form instance (therefore addField can be chained)
     */
     public function renameField($field,$newname) {
          $oldname = $field->getName();
          if (isset($this->fields[$oldname])) {
               unset($this->fields[$oldname]);
               $field->setName($newname);
               $this->fields[$newname] = $field;
          }
          return $this;
     }

    /**
     * begin - begins a form. Should be not be called directly, it is handled
     *              by the Twig Form extension.
     *
     * @param array $attr form extra attributes, if any.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function begin($attr=array())
     {
          $attr['method'] = $this->method;
          $attr['action'] = $this->action;
          if (!empty($this->id)) {
               $attr['id'] = $this->id;
          }
          $this->core->tpl->getExtension('dc_form')->renderWidget(
               'beginform',
               $attr);
     }

    /**
     * end - ends a form. Should be not be called directly, it is handled
     *              by the Twig Form extension.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function end($attr=array())
     {
          $this->core->tpl->getExtension('dc_form')->renderWidget(
               'endform',$attr);
     }

    /**
     * __isset - magic method isset, checks whether a field exists
     *                   example : if (isset($form->field1))
     *
     * @param mixed $name field name to check.
     *
     * @access public
     *
     * @return boolean true if the field exists.
     */
     public function __isset($name)
     {
          return isset($this->fields[$name]);
     }

    /**
     * __get -- magic method, retrieves a field from a form
     *              example : $f = $form->field1
     *
     * @param mixed $name Description.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function __get($name)
     {
          if (isset($this->fields[$name])) {
               $f = $this->fields[$name];
               if ($f->isMultiple()) {
                    return $f->getValues();
               } else {
                    return $f->getValue();
               }
          } else {
               return $this->getProperty($name);
          }
     }

    /**
     * __set -- magic method, sets a value for a given form field
     *              example : $form->field1 = 'my value';
     *
     * @param mixed $name  the field name.
     * @param mixed $value the field value.
     *
     * @access public
     */
     public function __set($name,$value)
     {
          if (isset($this->fields[$name])) {
               $f = $this->fields[$name];
               if ($f->isMultiple()) {
                    $this->fields[$name]->setValues($value);
               } else {
                    $this->fields[$name]->setValue($value);
               }
          } else {
               $this->setProperty($name,$value);
          }
     }

    /**
     * setupFields - initializes form & fields from $_GET or $_POST
     * 
     * @access protected
     */
     protected function setupFields() {
          $from = $this->method == 'POST' ? $_POST : $_GET;
          if (!empty($from)) {
               foreach ($this->fields as $f) {
                    $f->setup($from);
               }
          }
     }

    /**
     * handleActions - handle appropriate actions, according to submitted fields
     * 
     * @param mixed $submitted the fields that have been submitted.
     *
     * @access protected
     */
     protected function handleActions($submitted) {
          $hasActions = false;
          foreach ($submitted as $f) {
               $action = $f->getAction();
               if ($action != NULL) {
                    $hasActions = true;
                    $ret = call_user_func($action,$this);
               }
          }
     }

    /**
     * getSubmittedFields - retrieves fields that have been submitted, if any
     *
     * @access protected
     *
     * @return array the list of submitted fields.
     */
     protected function getSubmittedFields() {
          $s = array();
          foreach ($this->submitfields as $f) {
               if ($f->isDefined()) {
                    $s[$f->getName()] = $f;
               }
          }
          return $s;
     }

    /**
     * isSubmitted - returns whether form has been submitted or not
     *
     * @access public
     *
     * @return boolean true if the form has been submitted.
     */   
     public function isSubmitted() {
          foreach ($this->submitfields as $f) {
               if ($f->isDefined()) {
                    return true;
               }
          }
          return false;       
     }
     
    /**
     * setup - sets up the form, given the parameters given to the page
     *              should be called after fields have been defined.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function setup()
     {
          $this->setupFields();
          $submitted = $this->getSubmittedFields();
          $this->handleActions($submitted);
     }

    /**
     * check - checks if the form is valid, errors are filled in, in case of
     *              incorrect fields
     *
     * @access public
     */
     public function check(dcAdminContext $ctx)
     {
          $valid = true;
          foreach ($this->fields as $f) {
               try {
                    $f->check();
               }
               catch (InvalidFieldException $e) {
                    $valid = false;
                    $ctx->addError($e->getMessage());
               }
          }
          if (!$valid) {
               throw new InvalidFieldException ("Some fields are missing");
          }
     }

     public function getFieldIDs() {
          return array_keys($this->fields);
     }
     
    /**
     * getHiddenFields - returns the list of hidden fields
     *
     * @access public
     *
     * @return array the list of hidden fields.
     */
     public function getHiddenFields()
     {
          return $this->hiddenfields;
     }
}

/**
 * Template form field
 */
abstract class dcField implements Countable
{
     /** @var string field options */
     protected $options;
     /** @var string field name */
     protected $name;
     /** @var string field values */
     protected $values;
     /** @var string field id */
     protected $id;
     /** @var boolean true if field can contain multiple values */
     protected $multiple;
     /** @var boolean true if the field has been defined */
     protected $defined;

    /**
     * __construct - constructor
     *
     * @param string $name   Name or array(name,id) for field.
     * @param array $values  field values.
     * @param array $options options
     *
     * Currently globally available options are :
     *  * multiple : true/false. Enable multiple values for field
     * @access public
     *
     * @return mixed Value.
     */
     public function __construct($name,$values,$options=array())
     {
          $this->setNID($name);
          $this->options = new ArrayObject($options);
          if ($values === NULL){
               $values = array();
          }
          $this->setValues($values);
          $this->defined = false;
          $this->multiple = (isset($options['multiple']) && $options['multiple']);

     }

    /**
     * defines whether a field is multiple or not
     *
     * @param boolean true if the field is multiple
      *
     * @access public
     */
     public function setMultiple($m=true) {
          $this->multiple = $m;
     }
     
    /**
     * Returns whether can have multiple values or not
     *
     * @return boolean true if the field has multiple values
      *
     * @access public
     */
     public function isMultiple($m=true) {
          return $this->multiple;
     }

    /**
     * setNID - defines fiels name & id
     *
     * @param mixed $nid field name (string) or an array containing  name (1st)
     *                   and id (2nd field).
     *
     * @access protected
     */
     protected function setNID($nid)
     {
          if (is_array($nid)) {
               $this->name = $nid[0];
               $this->id = !empty($nid[1]) ? $nid[1] : null;
          }
          else {
               $this->id = $this->name = $nid;
          }
     }

    /**
     * setValue - sets field value
     *
     * @param mixed $value  field value.
     * @param int   $offset value offset to define (default 0).
     *
     * @access public
     */
     public function setValue($value,$offset=0) {
          $this->values[$offset] = $value;
     }

    /**
     * setValues - set field values
     *
     * @param mixed $values the array of values. If not an array, the parameter
     *                      will be converted to an array containing the value
     *
     * @access public
     */
     public function setValues($values) {
          if (is_array($values)) {
               $this->values = $values;
          } elseif ($values !== NULL) {
               $this->values = array($values);
          }

     }

    /**
     * getValues - return field values
     *
     * @access public
     *
     * @return mixed the array of values.
     */
     public function getValues() {
          return $this->values;
     }

    /**
     * getValue - retrieves a field value
     *
     * @param int $offset value offset (by default 1st value is returned).
     *
     * @access public
     *
     * @return mixed the field value.
     */
     public function getValue($offset=0) {
          if (isset($this->values[$offset])) {
               return $this->values[$offset];
          }
     }

    /**
     * addValue -- Adds a value to the field values.
     * 
     * @param mixed $value Description.
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function addValue($value) {
          $this->values[] = $value;
     }
     public function delValue($offset) {
          if (isset($this->values[$offset])) {
               array_splice($this->values,$offset,1);
          }
     }

    /**
     * count -- returns the number of field values
     * 
     * @access public
     *
     * @return integer the number of values.
     */
     public function count() {
          return count($this->values);
     }

     public function __toString()
     {
          return join(',',$this->values);
     }
     
     abstract public function getWidgetBlock();
     
     public function isEmpty() {
          return (count($this->values) == 0) || empty($this->values[0]);
     }

    /**
     * getAttributes - retrieve field attributes that will be given to the
     *                   twig widget
     *
     * @param array $options extra options given to the widget
     *
     * @access public
     *
     * @return array the attributes.
     */
     public function getAttributes($options=array())
     {
          $offset = isset($options['offset']) ? $options['offset'] : 0;

          $attr = $this->options->getArrayCopy();
          if (isset($this->values[$offset])) {
               $attr['value'] = $this->values[$offset];
          } else {
               $attr['value'] = $this->getDefaultValue();
          }
          if ($offset==0 && !empty($this->id)) {
               $attr['id']=$this->id;
          }
          $attr['name'] = $this->name;
          if ($this->multiple) {
               $attr['name'] = $attr['name'].'[]';
          }
          return $attr;
     }

    /**
     * getDefaultValue - returns field default value
     * 
     * @access public
     *
     * @return mixed the field default value.
     */
     public function getDefaultValue() {
          return '';
     }

    /**
     * getName - returns field name
     * 
     * @access public
     *
     * @return string the field name.
     */
     public function getName()
     {
          return $this->name;
     }

    /**
     * setName - defines field name and/or field id
     * 
     * @param mixed $name the field name or an array containing name and id.
     *
     * @access public
     */
     public function setName($name) {
          $this->setNID($name);
     }

    /**
     * check - checks whether the field is valid or not - raises an exception 
     *              if not valid
     * @access public
     */
     public function check()
     {
          if (isset($this->options ['required']) && $this->options['required']) {
               if (!$this->defined || $this->isEmpty()) {
                    throw new InvalidFieldException(sprintf(
                         'Field "%s" is mandatory',
                         $this->options['label'])
                    );
               }
          }
     }

    /**
     * parseValues - parses field value from context (GET or POST)
     *                   and returns parsed value(s)
     *                   NOTE : the field is not updated with this method
     *                   use setup() to also update the field.
     * @param mixed $from the context (usually $_GET or $_POST).
     *
     * @access public
     *
     * @return array the list of values (empty array if no value).
     */
     public function parseValues($from) {
          if (isset($from[$this->name])) {
               $n = $from[$this->name];
               if (!is_array($n)) {
                    $n = array($n);
               }
               return $n;
          }
          return array();
     }

    /**
     * setup - sets up the field from conetxt (GET or $POST)
     *
     * @param mixed $from the context (usually $_GET or $_POST).
     *
     * @access public
     *
     * @return mixed Value.
     */
     public function setup($from)
     {
          $values = $this->parseValues($from);
          if (count($values)) {
               $this->setValues($values);
               $this->defined = true;
          }
     }

    /**
     * isDefined - returns whether the field is defined or not
     *                   (a field is defined if some values are set after setup())
     * @access public
     *
     * @return mixed Value.
     */
     public function isDefined()
     {
          return $this->defined;
     }
}


/**
 * Template form field of type "password"
 */
class dcFieldPassword extends dcField
{
     public function getWidgetBlock()
     {
          return "field_password";
     }
}

/**
 * Template form field of type "text"
 */
class dcFieldText extends dcField
{
     public function getWidgetBlock()
     {
     return "field_text";
     }
}

/**
 * Template form field of type "textarea"
 */
class dcFieldTextArea extends dcField
{
     public function getWidgetBlock()
     {
          return "field_textarea";
     }
}

/**
 * Template form field of type "hidden"
 */
class dcFieldHidden extends dcField
{
     public function getWidgetBlock()
     {
          return "field_hidden";
     }
}

/**
 * Template form field of type "checkbox"
 */
class dcFieldCheckbox extends dcField
{
     protected $checked;
     
     public function __construct($name,$values,$options=array())
     {
          $val = array();
          if (!is_array($values)) {
               $values = array("1" => !empty($values));
          }
          $this->checked = $values;
          parent::__construct($name,array_keys($values),$options);
     }

    /**
     * setValue - sets field value
     *
     * @param mixed $value  field value.
     * @param int   $offset value offset to define (default 0).
     *
     * @access public
     */
     public function setValue($value,$offset=0) {
          $this->checked[$this->values[0]] = $value;
     }
     
     public function getValue($offset=0) {
          $val = parent::getValue($offset);
          if (isset($this->checked[$val])) {
               return $this->checked[$val]?$val:false;
          } else {
               return false;
          }
     }
     
     public function getAttributes($options=array())
     {
          $a = parent::getAttributes($options);
          
          $val = $a['value'];
          if (isset($this->checked[$val]) && $this->checked[$val]) {
               $a['checked']='checked';
          }
          return $a;
     }

     public function setup($from)
     {
          $this->defined = true;
          $values = $this->parseValues($from);
          foreach ($this->checked as $k=>&$v) {
               $v=false;
          }
          foreach ($values as $v) {
               $this->checked[$v] = true;
          }
          $this->setValues(array_keys($this->checked));
     }

     public function getWidgetBlock()
     {
          return "field_checkbox";
     }

     public function getDefaultValue() {
          return false;
     }
}

/**
 * Template form action
 */
abstract class dcFieldAction extends dcField
{
     protected $action;

     public function __construct($name,$values,$options=array())
     {
          parent::__construct($name,$values,$options);

          if (isset($options['action'])) {
               $this->action = $options['action'];
          } else {
               $this->action = NULL;
          }
     }

     public function getAction()
     {
          return $this->action;
     }
}

/**
 * Template form field of type "submit"
 */
class dcFieldSubmit extends dcFieldAction
{
     public function getWidgetBlock()
     {
          return "field_submit";
     }
}

/**
 * Template form field of type "combo"
 */
class dcFieldCombo extends dcField
{
     protected $combo;
     protected $combo_values;

     public function __construct($name,$value,$combo,$options=array())
     {
          $this->combo = $combo;
          $this->combo_values = $combo;
          foreach ($combo as $k=>$v) {
               if (is_array($v)) {
                    unset($this->combo_values[$k]);
                    $this->combo_values = array_merge($v,$this->combo_values);
               }
          }
          parent::__construct($name,$value,$options);
     }

     public function getWidgetBlock()
     {
          return "field_combo";
     }

     public function getDefaultValue() {
          return current(array_keys($this->combo_values));
     }

     public function parseValues($from) {
          $values = parent::parseValues($from);
          if (!is_array($values)) {
               $values = array($values);
          }
          foreach ($values as &$v) {
               if (!isset($this->combo_values[$v])) {
                    $v = $this->getDefaultValue();
               }
          }
          return $values;
     }

     public function getAttributes($options=array()) {
          $attr = parent::getAttributes($options);
          $attr['options'] = $this->combo;
          return $attr;
     }
}

?>