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<?php
/**
 * HTML Interface for drawing HTML elements
 * @version 0.9
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

interface htmlInterface {
    /**
     * Returns HTML content
     * @return string html
     */

    public function getHTML();
}

/**
 * Exceptions which will be thrown for this libary.
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

class Form_Exception extends Exception {}
/**
 * A HTML element object which is used for generating parts of the form
 * @version 0.9
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

abstract class Form_Html_Element implements htmlInterface {    
    /**
     * The tagname of the current element drawing
     *
     * @var string
     */

    protected $tagName;
    /**
     * Indicates the HTMLtag is selfclosing or not
     *
     * @var unknown_type
     */

    protected $selfClosing;
    /**
     * An numeric array with HTML properties which are allowed
     *
     * @var array
     */

    protected $allowedProperties;
    /**
     * A set of properties, key is the name, value is the value
     *
     * @var array
     */

    private $properties;    
    public function __construct() {
        $this->properties = array();
        $this->allowedProperties = array();
        $this->selfClosing = false;
        $this->tagName = null;
    }

    /**
     * Set a desired property of this HTML element
     *
     * @param string $propertyName
     * @param string $propertyValue
     * @return boolean
     */

    public function __set($propertyName,$propertyValue) {
        if(in_array($propertyName,$this->allowedProperties)) {
            $this->properties[$propertyName] = $propertyValue;
            return true;
        }
else {
            throw new Form_Exception('Property ('.$propertyName.') is not known.');
        }
    }

    /**
     * Get a desired property of the this HTML element
     *
     * @param string $propertyName
     * @return string
     */

    public function __get($propertyName) {
        switch ($propertyName) {
            case
'text' :
                return $this->text;                
            default :

                if(in_array($propertyName,$this->allowedProperties)) {
                    return $this->properties[$propertyName];
                }
else {
                    throw new Form_Exception('Property ('.$propertyName.') is not known.');
                }
        }
    }

    /**
     * Returns all of the properties
     *
     * @return array
     */

    protected function getProperties() {
        return $this->properties;
    }

    /**
     * Draw the property, and draw innerHTML of parent properties of neccasary
     *
     * @param string $innerHTML HTML contents
     * @return string HTML contents
     */

    public function getHTML($innerHTML=false) {
        if(is_null($this->tagName)) throw new Form_Exception('Tagname of Form_Html_Element not set yet.');
        
        $str = '';
        $str = '<'.$this->tagName.' ';
        
        foreach ($this->getProperties() as $name=>$property) {
            $str .= $name.'="'.$property.'" ';
        }

        
        if($this->selfClosing) {
            $str .= '/>';
        }
else {
            $str .= '>'.(!$innerHTML ? '' : $innerHTML).'</'.$this->tagName.'>';
        }

        
        return $str;
    }
}

/**
 * Class the generate forms
 *
 * @version 0.9
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 *
 */

class Form extends Form_Html_Element {
    protected $fields;
    public function __construct() {
        parent::__construct();
        $this->fields = array();
        $this->allowedProperties[] = 'method';        
        $this->allowedProperties[] = 'action';        
        $this->allowedProperties[] = 'enctype';        
        $this->allowedProperties[] = 'id';        
        $this->allowedProperties[] = 'class';        
        
        $this->tagName = 'form';
        $this->selfClosing = false;
    }

    public function addField($label,Form_Field $field) {
        $this->fields[$field->name] = array('label' => $label, 'field' => $field);
    }
    
    public function getHTML() {
        $innerHTML = '';
                
        foreach ($this->fields as $fieldElements) {            
            $innerHTML .= '<div>';
            
            if($fieldElements['label'] instanceof Form_Label ) {                
                $innerHTML .= $fieldElements['label']->getHTML();
            }

            $innerHTML .= $fieldElements['field']->getHTML();
            
            $innerHTML .= '</div>';
        }

        
        return parent::getHTML($innerHTML);
    }
}

/**
 * Abstract class for a form field. A form field can either be a input field or a textarea
 *
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

abstract class Form_Field extends Form_Html_Element {}
/**
 * The abstract class for generating the labels for a form field. The children tell the class
 * wether it's a div or something else.
 *
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

abstract class Form_Label extends Form_Html_Element {
    const SAFE_LABEL = true;
    protected $text;
    public function __construct($text) {        
        parent::__construct();
        $this->text = self::SAFE_LABEL ? htmlentities($text) : $text;
    }

    /**
     * The inner text can be protected against HTML code
     *
     * @param string $propertyName
     * @param string $propertyValue
     * @return boolean
     */

    public function __set($propertyName,$propertyValue) {
        switch ($propertyName) {
            case
'text':                
                $this->text = self::SAFE_LABEL ? htmlentities($propertyValue) : $propertyValue;
                return true;        
            default:

                return parent::__set($propertyName,$propertyValue);                
        }
    }

    /**
     * Text is special property, returns property value
     *
     * @param string $propertyName
     * @return string
     */

    public function __get($propertyName) {
        switch ($propertyName) {
            case
'text' :
                return $this->text;                
            default :

                return parent::__get($propertyName);
        }
    }    
}

/**
 * Input elements
 *
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

final class Form_Field_Input extends Form_Field {
    public function __construct($type,$name) {
        parent::__construct();
        
        $this->allowedProperties[] = 'class';
        $this->allowedProperties[] = 'name';
        $this->allowedProperties[] = 'type';
        $this->allowedProperties[] = 'value';
        
        $this->selfClosing = true;
        $this->tagName = 'input';
        
        $this->type = $type;
        $this->name = $name;
        
    }
}

/**
 * Class for drawing textarea's
 *
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

final class Form_Field_TextArea extends Form_Field {
    const SAFE_LABEL = true;
    protected $text;
    /**
     *
     * @param string $text innertext of the element
     * @param string $name html property name
     * @param integer $cols number of editable columns
     * @param integer $rows number of editable rows
     */

    public function __construct($text,$name,$cols,$rows) {
        parent::__construct();
        $this->allowedProperties[] = 'name';
        $this->allowedProperties[] = 'id';
        $this->allowedProperties[] = 'class';
        $this->allowedProperties[] = 'cols';
        $this->allowedProperties[] = 'rows';
        
        $this->text = self::SAFE_LABEL ? htmlentities($text) : $text;
        $this->tagName = 'textarea';
        $this->selfClosing = false;
        
        $this->name = $name;
        $this->cols = $cols;
        $this->rows = $rows;
    }

    /**
     *
     * @param string $propertyName
     * @param string $propertyValue
     * @return boolean
     */

    public function __set($propertyName,$propertyValue) {
        switch ($propertyName) {
            case
'text':                
                $this->text = self::SAFE_LABEL ? htmlentities($propertyValue) : $propertyValue;
                return true;        
            default:

                return parent::__set($propertyName,$propertyValue);                
        }
    }

    /**
     *
     * @param string $propertyName
     * @return string
     */

    public function __get($propertyName) {
        switch ($propertyName) {
            case
'text' :
                return $this->text;                
            default :

                return parent::__get($propertyName);
        }
    }

    /**
     *
     * @return string
     */

    public function getHTML() {
        return parent::getHTML($this->text);
    }
}

/**
 * A field label with a DIV before it.
 * @author Kees Schepers <kees.schepers@scooterbase.net>
 */

final class Form_Label_Div extends Form_Label {
    /**
     *
     * @param string $text innertext of the element
     */

    public function __construct($text) {
        parent::__construct($text);
                
        $this->text = $text;
        $this->tagName = 'div';
        $this->selfClosing = false;
    }

    /**
     *
     * @return string HTML contents
     */

    public function getHTML() {        
        return parent::getHTML($this->text);
    }
}


/**
 * Voorbeeld
*/

$form = new Form();
$form->addField(new Form_Label_Div('Gebruikersnaam'),new Form_Field_Input('text','username'));
$form->addField(new Form_Label_Div('E-mail'),new Form_Field_Input('text','e-mail'));
$form->addField(null,new Form_Field_TextArea('Test','comments',40,10));
echo $form->getHTML();
?>

 
 

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