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<?php

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namespace Contactable\SWV;

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use WP_Error;

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/**

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* The base class of SWV rules.

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abstract class Rule {

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protected $properties = array();

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public function __construct( $properties = '' ) {

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$this->properties = wp_parse_args( $properties, array() );

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}

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/**

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* Returns true if this rule matches the given context.

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* @param array $context Context.

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public function matches( $context ) {

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$field = $this->get_property( 'field' );

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if ( ! empty( $context['field'] ) ) {

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if ( $field and ! in_array( $field, (array) $context['field'], true ) ) {

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return false;

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}

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}

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return true;

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}

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/**

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* Validates with this rule's logic.

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* @param array $context Context.

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public function validate( $context ) {

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return true;

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}

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/**

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* Converts the properties to an array.

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* @return array Array of properties.

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public function to_array() {

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$properties = (array) $this->properties;

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if ( defined( 'static::rule_name' ) and static::rule_name ) {

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$properties = array( 'rule' => static::rule_name ) + $properties;

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}

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return $properties;

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}

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/**

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* Returns the property value specified by the given property name.

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* @param string $name Property name.

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* @return mixed Property value.

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public function get_property( $name ) {

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if ( isset( $this->properties[$name] ) ) {

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return $this->properties[$name];

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}

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}

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/**

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* Returns the default user input value from $_POST.

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* @return mixed Default user input value.

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public function get_default_input() {

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$field = $this->get_property( 'field' );

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if ( isset( $_POST[$field] ) ) {

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return wp_unslash( $_POST[$field] );

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}

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return '';

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}

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/**

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* Creates an error object. Returns false if the error property is omitted.

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protected function create_error() {

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$error_code = defined( 'static::rule_name' )

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? sprintf( 'swv_%s', static::rule_name )

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: 'swv';

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return new WP_Error(

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$error_code,

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(string) $this->get_property( 'error' ),

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$this

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);

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}

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}

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/**

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* The base class of SWV composite rules.

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abstract class CompositeRule extends Rule {

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protected $rules = array();

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/**

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* Adds a sub-rule to this composite rule.

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* @param Rule $rule Sub-rule to be added.

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public function add_rule( $rule ) {

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if ( $rule instanceof Rule ) {

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$this->rules[] = $rule;

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}

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}

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/**

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* Returns an iterator of sub-rules.

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public function rules() {

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foreach ( $this->rules as $rule ) {

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yield $rule;

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}

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}

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/**

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* Returns true if this rule matches the given context.

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* @param array $context Context.

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public function matches( $context ) {

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return true;

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}

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/**

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* Validates with this rule's logic.

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* @param array $context Context.

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public function validate( $context ) {

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foreach ( $this->rules() as $rule ) {

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if ( $rule->matches( $context ) ) {

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$result = $rule->validate( $context );

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if ( is_wp_error( $result ) ) {

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return $result;

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}

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}

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}

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return true;

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}

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/**

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* Converts the properties to an array.

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* @return array Array of properties.

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public function to_array() {

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$rules_arrays = array_map(

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static function ( $rule ) {

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return $rule->to_array();

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$this->rules

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);

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return array_merge(

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parent::to_array(),

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array(

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'rules' => $rules_arrays,

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)

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);

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}

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}

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