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<?php
/**
* Base class for HTML_QuickForm2 rules
*
* PHP version 5
*
* LICENSE
*
* This source file is subject to BSD 3-Clause License that is bundled
* with this package in the file LICENSE and available at the URL
* https://raw.githubusercontent.com/pear/HTML_QuickForm2/trunk/docs/LICENSE
*
* @category HTML
* @package HTML_QuickForm2
* @author Alexey Borzov <avb@php.net>
* @author Bertrand Mansion <golgote@mamasam.com>
* @copyright 2006-2019 Alexey Borzov <avb@php.net>, Bertrand Mansion <golgote@mamasam.com>
* @license https://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @link https://pear.php.net/package/HTML_QuickForm2
*/
/**
* Abstract base class for HTML_QuickForm2 rules
*
* This class provides methods that allow chaining several rules together.
* Its validate() method executes the whole rule chain starting from this rule.
*
* @category HTML
* @package HTML_QuickForm2
* @author Alexey Borzov <avb@php.net>
* @author Bertrand Mansion <golgote@mamasam.com>
* @license https://opensource.org/licenses/BSD-3-Clause BSD 3-Clause License
* @version Release: 2.1.0
* @link https://pear.php.net/package/HTML_QuickForm2
*/
abstract class HTML_QuickForm2_Rule
{
/**
* Constant showing that validation should be run server-side
* @see HTML_QuickForm2_Node::addRule()
*/
const SERVER = 1;
/**
* Constant showing that validation should be run client-side (on form submit)
* @see HTML_QuickForm2_Node::addRule()
*/
const CLIENT = 2;
/**
* Constant showing that validation should be run client-side (on form submit and on leaving the field)
* @see HTML_QuickForm2_Node::addRule()
*/
const ONBLUR_CLIENT = 6;
/**
* A combination of SERVER and CLIENT constants
* @see HTML_QuickForm2_Node::addRule()
*/
const CLIENT_SERVER = 3;
/**
* A combination of SERVER and ONBLUR_CLIENT constants
* @see HTML_QuickForm2_Node::addRule()
*/
const ONBLUR_CLIENT_SERVER = 7;
/**
* An element whose value will be validated by this rule
* @var HTML_QuickForm2_Node
*/
protected $owner;
/**
* An error message to display if validation fails
* @var string
*/
protected $message;
/**
* Configuration data for the rule
* @var mixed
*/
protected $config;
/**
* Rules chained to this one via "and" and "or" operators
*
* The contents can be described as "disjunctive normal form", where an outer
* array represents a disjunction of conjunctive clauses represented by inner
* arrays.
*
* @var array
*/
protected $chainedRules = array(array());
/**
* Class constructor
*
* @param HTML_QuickForm2_Node $owner Element to validate
* @param string $message Error message to display if validation fails
* @param mixed $config Configuration data for the rule
*/
public function __construct(HTML_QuickForm2_Node $owner, $message = '', $config = null)
{
$this->setOwner($owner);
$this->setMessage($message);
$this->setConfig($config);
}
/**
* Merges local configuration with that provided for registerRule()
*
* Default behaviour is for global config to override local one, different
* Rules may implement more complex merging behaviours.
*
* @param mixed $localConfig Local configuration
* @param mixed $globalConfig Global configuration, usually provided to {@link HTML_QuickForm2_Factory::registerRule()}
*
* @return mixed Merged configuration
*/
public static function mergeConfig($localConfig, $globalConfig)
{
return is_null($globalConfig)? $localConfig: $globalConfig;
}
/**
* Sets configuration data for the rule
*
* @param mixed $config Rule configuration data (specific for a Rule)
*
* @return $this
* @throws HTML_QuickForm2_InvalidArgumentException in case of invalid
* configuration data
*/
public function setConfig($config)
{
$this->config = $config;
return $this;
}
/**
* Returns the rule's configuration data
*
* @return mixed Configuration data (specific for a Rule)
*/
public function getConfig()
{
return $this->config;
}
/**
* Sets the error message output by the rule
*
* @param string $message Error message to display if validation fails
*
* @return $this
* @throws HTML_QuickForm2_InvalidArgumentException if trying to validate
* HTML_QuickForm2_Element_InputHidden with a non-empty error message
* (e.g. not in Rule chain)
*/
public function setMessage($message)
{
if ($this->owner instanceof HTML_QuickForm2_Element_InputHidden
&& strlen($message)
) {
throw new HTML_QuickForm2_InvalidArgumentException(
"Hidden elements cannot have validation errors"
);
}
$this->message = (string)$message;
return $this;
}
/**
* Returns the error message output by the rule
*
* @return string Error message
*/
public function getMessage()
{
return $this->message;
}
/**
* Sets the element that will be validated by this rule
*
* @param HTML_QuickForm2_Node $owner Element to validate
*
* @throws HTML_QuickForm2_InvalidArgumentException if trying to set
* an instance of HTML_QuickForm2_Element_Static as rule owner; if
* trying to validate HTML_QuickForm2_Element_InputHidden with a
* non-empty error message (e.g. not in Rule chain)
*/
public function setOwner(HTML_QuickForm2_Node $owner)
{
// Very little sense to validate static elements as they're, well, static.
// If someone comes up with a validation rule for these, he can override
// setOwner() there...
if ($owner instanceof HTML_QuickForm2_Element_Static) {
throw new HTML_QuickForm2_InvalidArgumentException(
get_class($this) . ' cannot validate Static elements'
);
}
if ($owner instanceof HTML_QuickForm2_Element_InputHidden
&& strlen($this->getMessage())
) {
throw new HTML_QuickForm2_InvalidArgumentException(
"Hidden elements cannot have validation errors"
);
}
if (null !== $this->owner) {
$this->owner->removeRule($this);
}
$this->owner = $owner;
}
/**
* Adds a rule to the chain with an "and" operator
*
* Evaluation is short-circuited, next rule will not be evaluated if the
* previous one returns false. The method is named this way because "and" is
* a reserved word in PHP.
*
* @param HTML_QuickForm2_Rule $next
*
* @return $this first rule in the chain (i.e. $this)
* @throws HTML_QuickForm2_InvalidArgumentException when trying to add
* a "required" rule to the chain
*/
public function and_(HTML_QuickForm2_Rule $next)
{
if ($next instanceof HTML_QuickForm2_Rule_Required) {
throw new HTML_QuickForm2_InvalidArgumentException(
'and_(): Cannot add a "required" rule'
);
}
$this->chainedRules[count($this->chainedRules) - 1][] = $next;
return $this;
}
/**
* Adds a rule to the chain with an "or" operator
*
* Evaluation is short-circuited, next rule will not be evaluated if the
* previous one returns true. The method is named this way because "or" is
* a reserved word in PHP.
*
* @param HTML_QuickForm2_Rule $next
*
* @return $this first rule in the chain (i.e. $this)
* @throws HTML_QuickForm2_InvalidArgumentException when trying to add
* a "required" rule to the chain
*/
public function or_(HTML_QuickForm2_Rule $next)
{
if ($next instanceof HTML_QuickForm2_Rule_Required) {
throw new HTML_QuickForm2_InvalidArgumentException(
'or_(): Cannot add a "required" rule'
);
}
$this->chainedRules[] = array($next);
return $this;
}
/**
* Performs validation
*
* The whole rule chain is executed. Note that the side effect of this
* method is setting the error message on element if validation fails
*
* @return boolean Whether the element is valid
*/
public function validate()
{
$globalValid = false;
$localValid = $this->validateOwner();
foreach ($this->chainedRules as $item) {
/* @var $multiplier HTML_QuickForm2_Rule */
foreach ($item as $multiplier) {
if (!($localValid = $localValid && $multiplier->validate())) {
break;
}
}
if ($globalValid = $globalValid || $localValid) {
break;
}
$localValid = true;
}
$globalValid or $this->setOwnerError();
return $globalValid;
}
/**
* Validates the owner element
*
* @return bool Whether owner element is valid according to the rule
*/
abstract protected function validateOwner();
/**
* Sets the error message on the owner element
*/
protected function setOwnerError()
{
if (strlen($this->getMessage()) && !$this->owner->getError()) {
$this->owner->setError($this->getMessage());
}
}
/**
* Returns the client-side validation callback
*
* This essentially builds a Javascript version of validateOwner() method,
* with element ID and Rule configuration hardcoded.
*
* @return string Javascript function to validate the element's value
* @throws HTML_QuickForm2_Exception if Rule can only be run server-side
*/
protected function getJavascriptCallback()
{
throw new HTML_QuickForm2_Exception(
get_class($this) . ' does not implement javascript validation'
);
}
/**
* Returns IDs of form fields that should trigger "live" Javascript validation
*
* This returns IDs that are linked to the rule itself.
*
* @return array
*/
protected function getOwnJavascriptTriggers()
{
return $this->owner->getJavascriptTriggers();
}
/**
* Returns IDs of form fields that should trigger "live" Javascript validation
*
* This returns IDs that are linked to the rule itself and its chained
* rules. Live validation will be be triggered by 'blur' or 'change' event
* on any of the elements whose IDs are returned by this method.
*
* @return array
*/
protected function getJavascriptTriggers()
{
$triggers = array_flip($this->getOwnJavascriptTriggers());
foreach ($this->chainedRules as $item) {
/* @var $multiplier HTML_QuickForm2_Rule */
foreach ($item as $multiplier) {
foreach ($multiplier->getJavascriptTriggers() as $trigger) {
$triggers[$trigger] = true;
}
}
}
return array_keys($triggers);
}
/**
* Returns the client-side representation of the Rule
*
* This creates an instance of either qf.Rule or qf.LiveRule (depends on
* $outputTriggers) with initialization parameters:
* - callback: {@see getJavascriptCallback()}
* - element ID to set error for if validation fails
* - error message to set if validation fails
* - triggers: {@see getJavascriptTriggers()} (only for
* qf.LiveRule when $outputTriggers is true)
* - chained rules, array of arrays like in $chainedRules property
*
* @param bool $outputTriggers Whether the Rule will be run onblur / onchange
*
* @return string
* @throws HTML_QuickForm2_Exception if Rule or its chained Rules can only
* be run server-side
*/
public function getJavascript($outputTriggers = true)
{
HTML_QuickForm2_Loader::loadClass('HTML_QuickForm2_JavascriptBuilder');
$js = $this->getJavascriptCallback() . ",\n\t'" . $this->owner->getId()
. "', " . HTML_QuickForm2_JavascriptBuilder::encode($this->getMessage());
$js = $outputTriggers && count($triggers = $this->getJavascriptTriggers())
? 'new qf.LiveRule(' . $js . ', ' . HTML_QuickForm2_JavascriptBuilder::encode($triggers)
: 'new qf.Rule(' . $js;
if (count($this->chainedRules) > 1 || count($this->chainedRules[0]) > 0) {
$chained = array();
foreach ($this->chainedRules as $item) {
$multipliers = array();
/* @var $multiplier HTML_QuickForm2_Rule */
foreach ($item as $multiplier) {
$multipliers[] = $multiplier->getJavascript(false);
}
$chained[] = '[' . implode(",\n", $multipliers) . ']';
}
$js .= ",\n\t [" . implode(",\n", $chained) . "]";
}
return $js . ')';
}
}
?>
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