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Editing: mail-tag.php

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<?php

/**
 * Class that represents a mail-tag.
 */
class WPCF7_MailTag {

private $tag;
	private $tagname = '';
	private $name = '';
	private $options = array();
	private $values = array();
	private $form_tag = null;

/**
	 * The constructor method.
	 */
	public function __construct( $tag, $tagname, $values ) {
		$this->tag = $tag;
		$this->name = $this->tagname = $tagname;

$this->options = array(
			'do_not_heat' => false,
			'format' => '',
		);

if ( ! empty( $values ) ) {
			preg_match_all( '/"[^"]*"|\'[^\']*\'/', $values, $matches );
			$this->values = wpcf7_strip_quote_deep( $matches[0] );
		}

if ( preg_match( '/^_raw_(.+)$/', $tagname, $matches ) ) {
			$this->name = trim( $matches[1] );
			$this->options['do_not_heat'] = true;
		}

if ( preg_match( '/^_format_(.+)$/', $tagname, $matches ) ) {
			$this->name = trim( $matches[1] );
			$this->options['format'] = $this->values[0];
		}
	}

/**
	 * Returns the name part of this mail-tag.
	 */
	public function tag_name() {
		return $this->tagname;
	}

/**
	 * Returns the form field name corresponding to this mail-tag.
	 */
	public function field_name() {
		return strtr( $this->name, '.', '_' );
	}

/**
	 * Returns the value of the specified option.
	 */
	public function get_option( $option ) {
		return $this->options[$option];
	}

/**
	 * Returns the values part of this mail-tag.
	 */
	public function values() {
		return $this->values;
	}

/**
	 * Retrieves the WPCF7_FormTag object that corresponds to this mail-tag.
	 */
	public function corresponding_form_tag() {
		if ( $this->form_tag instanceof WPCF7_FormTag ) {
			return $this->form_tag;
		}

if ( $submission = WPCF7_Submission::get_instance() ) {
			$contact_form = $submission->get_contact_form();

$tags = $contact_form->scan_form_tags( array(
				'name' => $this->field_name(),
				'feature' => '! zero-controls-container',
			) );

if ( $tags ) {
				$this->form_tag = $tags[0];
			}
		}

return $this->form_tag;
	}

}

use Contactable\SWV;

/**
 * Mail-tag output calculator.
 */
class WPCF7_MailTag_OutputCalculator {

const email = 0b100;
	const text = 0b010;
	const blank = 0b001;

private $contact_form;

public function __construct( WPCF7_ContactForm $contact_form ) {
		$this->contact_form = $contact_form;
	}

public function calc_output( WPCF7_MailTag $mail_tag ) {
		return $this->calc_swv_result(
			$mail_tag,
			$this->contact_form->get_schema()
		);
	}

private function calc_swv_result( WPCF7_MailTag $mail_tag, SWV\Rule $rule ) {

if ( $rule instanceof SWV\AnyRule ) {
			$result = 0b000;

foreach ( $rule->rules() as $child_rule ) {
				$result |= $this->calc_swv_result( $mail_tag, $child_rule );
			}

return $result;
		}

if ( $rule instanceof SWV\CompositeRule ) {
			$result = 0b111;

foreach ( $rule->rules() as $child_rule ) {
				$result &= $this->calc_swv_result( $mail_tag, $child_rule );
			}

return $result;
		}

$field_prop = $rule->get_property( 'field' );

if ( empty( $field_prop ) or $field_prop !== $mail_tag->field_name() ) {
			return self::email | self::text | self::blank;
		}

if ( $rule instanceof SWV\RequiredRule ) {
			return ~ self::blank;
		}

if ( $rule instanceof SWV\EmailRule ) {
			return self::email | self::blank;
		}

if ( $rule instanceof SWV\EnumRule ) {
			$acceptable_values = (array) $rule->get_property( 'accept' );
			$acceptable_values = array_map( 'strval', $acceptable_values );
			$acceptable_values = array_filter( $acceptable_values );
			$acceptable_values = array_unique( $acceptable_values );

if ( ! $mail_tag->get_option( 'do_not_heat' ) ) {
				$pipes = $this->contact_form->get_pipes(
					$mail_tag->field_name()
				);

$acceptable_values = array_map(
					static function ( $val ) use ( $pipes ) {
						return $pipes->do_pipe( $val );
					},
					$acceptable_values
				);
			}

$email_values = array_filter(
				$acceptable_values,
				'wpcf7_is_mailbox_list'
			);

if ( count( $email_values ) === count( $acceptable_values ) ) {
				return self::email | self::blank;
			} else {
				return self::email | self::text | self::blank;
			}
		}

return self::email | self::text | self::blank;
	}

}

Editing: mail-tag.php

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