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<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* Validation library.
*
* $Id: Validation.php 3917 2009-01-21 03:06:22Z zombor $
*
* @package Validation
* @author Kohana Team
* @copyright (c) 2007-2008 Kohana Team
* @license http://kohanaphp.com/license.html
*/
class Validation extends ArrayObject {

// Filters
protected $pre_filters = array();
protected $post_filters = array();

// Rules and callbacks
protected $rules = array();
protected $callbacks = array();

// Rules that are allowed to run on empty fields
protected $empty_rules = array('required', 'matches');

// Errors
protected $errors = array();
protected $messages = array();

// Fields that are expected to be arrays
protected $array_fields = array();

// Checks if there is data to validate.
protected $submitted;

/**
* Creates a new Validation instance.
*
* @param array array to use for validation
* @return object
*/
public static function factory(array $array)
{
return new Validation($array);
}

/**
* Sets the unique "any field" key and creates an ArrayObject from the
* passed array.
*
* @param array array to validate
* @return void
*/
public function __construct(array $array)
{
// The array is submitted if the array is not empty
$this->submitted = ! empty($array);

parent::__construct($array, ArrayObject::ARRAY_AS_PROPS | ArrayObject::STD_PROP_LIST);
}

/**
* Magic clone method, clears errors and messages.
*
* @return void
*/
public function __clone()
{
$this->errors = array();
$this->messages = array();
}

/**
* Create a copy of the current validation rules and change the array.
*
* @chainable
* @param array new array to validate
* @return Validation
*/
public function copy(array $array)
{
$copy = clone $this;

$copy->exchangeArray($array);

return $copy;
}

/**
* Test if the data has been submitted.
*
* @return boolean
*/
public function submitted($value = NULL)
{
if (is_bool($value))
{
$this->submitted = $value;
}

return $this->submitted;
}

/**
* Returns an array of all the field names that have filters, rules, or callbacks.
*
* @return array
*/
public function field_names()
{
// All the fields that are being validated
$fields = array_unique(array_merge
(
array_keys($this->pre_filters),
array_keys($this->rules),
array_keys($this->callbacks),
array_keys($this->post_filters)
));

// Remove wildcard fields
$fields = array_diff($fields, array('*'));

return $fields;
}

/**
* Returns the array values of the current object.
*
* @return array
*/
public function as_array()
{
return $this->getArrayCopy();
}

/**
* Returns the ArrayObject values, removing all inputs without rules.
* To choose specific inputs, list the field name as arguments.
*
* @param boolean return only fields with filters, rules, and callbacks
* @return array
*/
public function safe_array()
{
// Load choices
$choices = func_get_args();
$choices = empty($choices) ? NULL : array_combine($choices, $choices);

// Get field names
$fields = $this->field_names();

$safe = array();
foreach ($fields as $field)
{
if ($choices === NULL OR isset($choices[$field]))
{
if (isset($this[$field]))
{
$value = $this[$field];

if (is_object($value))
{
// Convert the value back into an array
$value = $value->getArrayCopy();
}
}
else
{
// Even if the field is not in this array, it must be set
$value = NULL;
}

// Add the field to the array
$safe[$field] = $value;
}
}

return $safe;
}

/**
* Add additional rules that will forced, even for empty fields. All arguments
* passed will be appended to the list.
*
* @chainable
* @param string rule name
* @return object
*/
public function allow_empty_rules($rules)
{
// Any number of args are supported
$rules = func_get_args();

// Merge the allowed rules
$this->empty_rules = array_merge($this->empty_rules, $rules);

return $this;
}

/**
* Converts a filter, rule, or callback into a fully-qualified callback array.
*
* @return mixed
*/
protected function callback($callback)
{
if (is_string($callback))
{
if (strpos($callback, '::') !== FALSE)
{
$callback = explode('::', $callback);
}
elseif (function_exists($callback))
{
// No need to check if the callback is a method
$callback = $callback;
}
elseif (method_exists($this, $callback))
{
// The callback exists in Validation
$callback = array($this, $callback);
}
elseif (method_exists('valid', $callback))
{
// The callback exists in valid::
$callback = array('valid', $callback);
}
}

if ( ! is_callable($callback, FALSE))
{
if (is_array($callback))
{
if (is_object($callback[0]))
{
// Object instance syntax
$name = get_class($callback[0]).'->'.$callback[1];
}
else
{
// Static class syntax
$name = $callback[0].'::'.$callback[1];
}
}
else
{
// Function syntax
$name = $callback;
}

throw new Kohana_Exception('validation.not_callable', $name);
}

return $callback;
}

/**
* Add a pre-filter to one or more inputs. Pre-filters are applied before
* rules or callbacks are executed.
*
* @chainable
* @param callback filter
* @param string fields to apply filter to, use TRUE for all fields
* @return object
*/
public function pre_filter($filter, $field = TRUE)
{
if ($field === TRUE OR $field === '*')
{
// Use wildcard
$fields = array('*');
}
else
{
// Add the filter to specific inputs
$fields = func_get_args();
$fields = array_slice($fields, 1);
}

// Convert to a proper callback
$filter = $this->callback($filter);

foreach ($fields as $field)
{
// Add the filter to specified field
$this->pre_filters[$field][] = $filter;
}

return $this;
}

/**
* Add a post-filter to one or more inputs. Post-filters are applied after
* rules and callbacks have been executed.
*
* @chainable
* @param callback filter
* @param string fields to apply filter to, use TRUE for all fields
* @return object
*/
public function post_filter($filter, $field = TRUE)
{
if ($field === TRUE)
{
// Use wildcard
$fields = array('*');
}
else
{
// Add the filter to specific inputs
$fields = func_get_args();
$fields = array_slice($fields, 1);
}

// Convert to a proper callback
$filter = $this->callback($filter);

foreach ($fields as $field)
{
// Add the filter to specified field
$this->post_filters[$field][] = $filter;
}

return $this;
}

/**
* Add rules to a field. Validation rules may only return TRUE or FALSE and
* can not manipulate the value of a field.
*
* @chainable
* @param string field name
* @param callback rules (one or more arguments)
* @return object
*/
public function add_rules($field, $rules)
{
// Get the rules
$rules = func_get_args();
$rules = array_slice($rules, 1);

if ($field === TRUE)
{
// Use wildcard
$field = '*';
}

foreach ($rules as $rule)
{
// Arguments for rule
$args = NULL;

if (is_string($rule))
{
if (preg_match('/^([^\[]++)\[(.+)\]$/', $rule, $matches))
{
// Split the rule into the function and args
$rule = $matches[1];
$args = preg_split('/(?<!\\\\),\s*/', $matches[2]);

// Replace escaped comma with comma
$args = str_replace('\,', ',', $args);
}
}

if ($rule === 'is_array')
{
// This field is expected to be an array
$this->array_fields[$field] = $field;
}

// Convert to a proper callback
$rule = $this->callback($rule);

// Add the rule, with args, to the field
$this->rules[$field][] = array($rule, $args);
}

return $this;
}

/**
* Add callbacks to a field. Callbacks must accept the Validation object
* and the input name. Callback returns are not processed.
*
* @chainable
* @param string field name
* @param callbacks callbacks (unlimited number)
* @return object
*/
public function add_callbacks($field, $callbacks)
{
// Get all callbacks as an array
$callbacks = func_get_args();
$callbacks = array_slice($callbacks, 1);

if ($field === TRUE)
{
// Use wildcard
$field = '*';
}

foreach ($callbacks as $callback)
{
// Convert to a proper callback
$callback = $this->callback($callback);

// Add the callback to specified field
$this->callbacks[$field][] = $callback;
}

return $this;
}

/**
* Validate by processing pre-filters, rules, callbacks, and post-filters.
* All fields that have filters, rules, or callbacks will be initialized if
* they are undefined. Validation will only be run if there is data already
* in the array.
*
* @param object Validation object, used only for recursion
* @param object name of field for errors
* @return bool
*/
public function validate($object = NULL, $field_name = NULL)
{
if ($object === NULL)
{
// Use the current object
$object = $this;
}

// Get all field names
$fields = $this->field_names();

// Copy the array from the object, to optimize multiple sets
$array = $this->getArrayCopy();

foreach ($fields as $field)
{
if ($field === '*')
{
// Ignore wildcard
continue;
}

if ( ! isset($array[$field]))
{
if (isset($this->array_fields[$field]))
{
// This field must be an array
$array[$field] = array();
}
else
{
$array[$field] = NULL;
}
}
}

// Swap the array back into the object
$this->exchangeArray($array);

// Get all defined field names
$fields = array_keys($array);

foreach ($this->pre_filters as $field => $callbacks)
{
foreach ($callbacks as $callback)
{
if ($field === '*')
{
foreach ($fields as $f)
{
$this[$f] = is_array($this[$f]) ? array_map($callback, $this[$f]) : call_user_func($callback, $this[$f]);
}
}
else
{
$this[$field] = is_array($this[$field]) ? array_map($callback, $this[$field]) : call_user_func($callback, $this[$field]);
}
}
}

if ($this->submitted === FALSE)
return FALSE;

foreach ($this->rules as $field => $callbacks)
{
foreach ($callbacks as $callback)
{
// Separate the callback and arguments
list ($callback, $args) = $callback;

// Function or method name of the rule
$rule = is_array($callback) ? $callback[1] : $callback;

if ($field === '*')
{
foreach ($fields as $f)
{
// Note that continue, instead of break, is used when
// applying rules using a wildcard, so that all fields
// will be validated.

if (isset($this->errors[$f]))
{
// Prevent other rules from being evaluated if an error has occurred
continue;
}

if (empty($this[$f]) AND ! in_array($rule, $this->empty_rules))
{
// This rule does not need to be processed on empty fields
continue;
}

if ($args === NULL)
{
if ( ! call_user_func($callback, $this[$f]))
{
$this->errors[$f] = $rule;

// Stop validating this field when an error is found
continue;
}
}
else
{
if ( ! call_user_func($callback, $this[$f], $args))
{
$this->errors[$f] = $rule;

// Stop validating this field when an error is found
continue;
}
}
}
}
else
{
if (isset($this->errors[$field]))
{
// Prevent other rules from being evaluated if an error has occurred
break;
}

if ( ! in_array($rule, $this->empty_rules) AND ! $this->required($this[$field]))
{
// This rule does not need to be processed on empty fields
continue;
}

if ($args === NULL)
{
if ( ! call_user_func($callback, $this[$field]))
{
$this->errors[$field] = $rule;

// Stop validating this field when an error is found
break;
}
}
else
{
if ( ! call_user_func($callback, $this[$field], $args))
{
$this->errors[$field] = $rule;

// Stop validating this field when an error is found
break;
}
}
}
}
}

foreach ($this->callbacks as $field => $callbacks)
{
foreach ($callbacks as $callback)
{
if ($field === '*')
{
foreach ($fields as $f)
{
// Note that continue, instead of break, is used when
// applying rules using a wildcard, so that all fields
// will be validated.

if (isset($this->errors[$f]))
{
// Stop validating this field when an error is found
continue;
}

call_user_func($callback, $this, $f);
}
}
else
{
if (isset($this->errors[$field]))
{
// Stop validating this field when an error is found
break;
}

call_user_func($callback, $this, $field);
}
}
}

foreach ($this->post_filters as $field => $callbacks)
{
foreach ($callbacks as $callback)
{
if ($field === '*')
{
foreach ($fields as $f)
{
$this[$f] = is_array($this[$f]) ? array_map($callback, $this[$f]) : call_user_func($callback, $this[$f]);
}
}
else
{
$this[$field] = is_array($this[$field]) ? array_map($callback, $this[$field]) : call_user_func($callback, $this[$field]);
}
}
}

// Return TRUE if there are no errors
return $this->errors === array();
}

/**
* Add an error to an input.
*
* @chainable
* @param string input name
* @param string unique error name
* @return object
*/
public function add_error($field, $name)
{
$this->errors[$field] = $name;

return $this;
}

/**
* Sets or returns the message for an input.
*
* @chainable
* @param string input key
* @param string message to set
* @return string|object
*/
public function message($input = NULL, $message = NULL)
{
if ($message === NULL)
{
if ($input === NULL)
{
$messages = array();
$keys = array_keys($this->messages);

foreach ($keys as $input)
{
$messages[] = $this->message($input);
}

return implode("\n", $messages);
}

// Return nothing if no message exists
if (empty($this->messages[$input]))
return '';

// Return the HTML message string
return $this->messages[$input];
}
else
{
$this->messages[$input] = $message;
}

return $this;
}

/**
* Return the errors array.
*
* @param boolean load errors from a lang file
* @return array
*/
public function errors($file = NULL)
{
if ($file === NULL)
{
return $this->errors;
}
else
{

$errors = array();
foreach ($this->errors as $input => $error)
{
// Key for this input error
$key = "$file.$input.$error";

if (($errors[$input] = Kohana::lang($key)) === $key)
{
// Get the default error message
$errors[$input] = Kohana::lang("$file.$input.default");
}
}

return $errors;
}
}

/**
* Rule: required. Generates an error if the field has an empty value.
*
* @param mixed input value
* @return bool
*/
public function required($str)
{
if (is_object($str) AND $str instanceof ArrayObject)
{
// Get the array from the ArrayObject
$str = $str->getArrayCopy();
}

if (is_array($str))
{
return ! empty($str);
}
else
{
return ! ($str === '' OR $str === NULL OR $str === FALSE);
}
}

/**
* Rule: matches. Generates an error if the field does not match one or more
* other fields.
*
* @param mixed input value
* @param array input names to match against
* @return bool
*/
public function matches($str, array $inputs)
{
foreach ($inputs as $key)
{
if ($str !== (isset($this[$key]) ? $this[$key] : NULL))
return FALSE;
}

return TRUE;
}

/**
* Rule: length. Generates an error if the field is too long or too short.
*
* @param mixed input value
* @param array minimum, maximum, or exact length to match
* @return bool
*/
public function length($str, array $length)
{
if ( ! is_string($str))
return FALSE;

$size = utf8::strlen($str);
$status = FALSE;

if (count($length) > 1)
{
list ($min, $max) = $length;

if ($size >= $min AND $size <= $max)
{
$status = TRUE;
}
}
else
{
$status = ($size === (int) $length[0]);
}

return $status;
}

/**
* Rule: depends_on. Generates an error if the field does not depend on one
* or more other fields.
*
* @param mixed field name
* @param array field names to check dependency
* @return bool
*/
public function depends_on($field, array $fields)
{
foreach ($fields as $depends_on)
{
if ( ! isset($this[$depends_on]) OR $this[$depends_on] == NULL)
return FALSE;
}

return TRUE;
}

/**
* Rule: chars. Generates an error if the field contains characters outside of the list.
*
* @param string field value
* @param array allowed characters
* @return bool
*/
public function chars($value, array $chars)
{
return ! preg_match('![^'.implode('', $chars).']!u', $value);
}

} // End Validation
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