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<?php

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namespace WPForms\Frontend;

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use WP_Post;

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/**

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* Form front-end rendering.

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* @since 1.8.1

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class Frontend {

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/**

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* Field format.

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* @since 1.8.9

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const FIELD_FORMAT = 'wpforms-%d-field_%s';

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/**

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* Render engine setting value.

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* @since 1.8.1

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* @var string

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protected $render_engine;

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/**

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* Render engine class instance.

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* @since 1.8.1

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* @var Classic|Modern

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private $render_obj;

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/**

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* AMP class instance.

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* @since 1.8.1

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* @var Amp

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protected $amp_obj;

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/**

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* Store form data to be referenced later.

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* @since 1.8.1

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* @var array

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public $forms;

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/**

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* Store information for multi-page forms.

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* False for forms that do not contain pages, otherwise an array that contains the number of total pages

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* and page counter used when displaying pagebreak fields.

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* @since 1.8.1

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* @var array|bool

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public $pages = false;

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/**

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* If the active form confirmation should auto scroll.

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* @since 1.8.1

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* @var bool

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public $confirmation_message_scroll = false;

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/**

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* Whether ChoiceJS library has already been enqueued on the front end.

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* This lib is used in different fields that can enqueue it separately,

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* and we use this property to avoid config duplication.

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* @since 1.8.1

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* @var bool

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public $is_choicesjs_enqueued = false;

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/**

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* Form action.

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* @since 1.8.1

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* @var string

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private $action;

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/**

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* Initialize class.

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* @since 1.8.1

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public function init() {

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$this->forms = [];

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$this->amp_obj = wpforms()->get( 'amp' );

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$this->init_render_engine( wpforms_get_render_engine() );

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$this->hooks();

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// Register shortcode.

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add_shortcode( 'wpforms', [ $this, 'shortcode' ] );

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}

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/**

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* Register hooks.

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* @since 1.8.1

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private function hooks() {

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// Actions.

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add_action( 'init', [ $this, 'init_style_settings' ] );

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add_action( 'wpforms_frontend_output_success', [ $this, 'confirmation' ], 10, 3 );

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add_action( 'wpforms_frontend_output', [ $this, 'head' ], 5, 5 );

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add_action( 'wpforms_frontend_output', [ $this, 'fields' ], 10, 5 );

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add_action( 'wpforms_display_field_before', [ $this, 'field_container_open' ], 5, 2 );

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add_action( 'wpforms_display_field_before', [ $this, 'field_fieldset_open' ], 10, 2 );

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add_action( 'wpforms_display_field_before', [ $this, 'field_label' ], 15, 2 );

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add_action( 'wpforms_display_field_before', [ $this, 'field_description' ], 20, 2 );

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add_action( 'wpforms_display_field_after', [ $this, 'field_error' ], 3, 2 );

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add_action( 'wpforms_display_field_after', [ $this, 'field_description' ], 5, 2 );

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add_action( 'wpforms_display_field_after', [ $this, 'field_fieldset_close' ], 10, 2 );

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add_action( 'wpforms_display_field_after', [ $this, 'field_container_close' ], 15, 2 );

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add_action( 'wpforms_frontend_output', [ $this, 'foot' ], 25, 5 );

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add_action( 'wp_enqueue_scripts', [ $this, 'assets_header' ] );

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add_action( 'wp_footer', [ $this, 'assets_footer' ], 15 );

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add_action( 'wp_footer', [ $this, 'missing_assets_error_js' ], 20 );

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add_action( 'wp_footer', [ $this, 'footer_end' ], 99 );

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}

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/**

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* Initialize render engine.

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* @since 1.8.1

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* @param string $engine Render engine slug, `classic` or `modern`.

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public function init_render_engine( $engine ) {

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$this->render_engine = $engine;

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$this->render_obj = wpforms()->get( "frontend_{$this->render_engine}" );

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$this->render_obj->hooks();

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}

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/**

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* Initialize form styling settings.

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* @since 1.8.1

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public function init_style_settings() {

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// Skip if modern markup settings is already set.

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$modern_markup_is_set = wpforms_setting( 'modern-markup-is-set' );

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if ( $modern_markup_is_set ) {

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return;

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}

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$settings = (array) get_option( 'wpforms_settings', [] );

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$count_posts = wp_count_posts( 'wpforms' );

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// Set the Modern markup checkbox to the checked state for all new users.

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$settings['modern-markup'] = ( $count_posts->publish + $count_posts->trash ) === 0 ? '1' : '0';

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$settings['modern-markup-is-set'] = true;

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// Hide the Modern markup checkbox for all new users.

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if ( $settings['modern-markup'] ) {

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$settings['modern-markup-hide-setting'] = true;

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}

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update_option( 'wpforms_settings', $settings );

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}

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/**

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* Primary function to render a form on the frontend.

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* @since 1.8.1

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* @param int $id Form ID.

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* @param bool $title Whether to display form title.

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* @param bool $description Whether to display form description.

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public function output( $id, $title = false, $description = false ) { // phpcs:ignore Generic.Metrics.CyclomaticComplexity.TooHigh

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if ( empty( $id ) ) {

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return;

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}

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// Grab the form data, if not found, then we bail.

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$form = $this->get_form( $id );

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if ( $form === null || empty( $form->post_content ) ) {

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return;

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}

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// We should display only the published form.

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if ( ! empty( $form->post_status ) && $form->post_status !== 'publish' ) {

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return;

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}

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// Decode the form data.

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$form_data = wpforms_decode( $form->post_content );

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// Skip if the form data is empty.

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if ( empty( $form_data ) ) {

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return;

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}

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// Basic information.

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/**

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* Filter frontend form data.

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* @since 1.4.3

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* @param array $form_data Form data.

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$form_data = (array) apply_filters( 'wpforms_frontend_form_data', $form_data );

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$form_id = absint( $form->ID );

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$this->action = esc_url_raw( remove_query_arg( 'wpforms' ) );

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$errors = empty( wpforms()->get( 'process' )->errors[ $form_id ] ) ? [] : wpforms()->get( 'process' )->errors[ $form_id ];

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$title = filter_var( $title, FILTER_VALIDATE_BOOLEAN );

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$description = filter_var( $description, FILTER_VALIDATE_BOOLEAN );

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// Pass the current form data to the render object.

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$this->render_obj->form_data = $form_data;

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if ( $this->stop_output( $form, $form_data ) ) {

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return;

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}

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// All checks have passed, so calculate multi-page details for the form.

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$this->pages = $this->get_pages( $form_data );

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/**

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* Allow modifying a form action attribute.

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* @since 1.1.2

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* @param string $action Action attribute.

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* @param array $form_data Form data and settings.

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* @param null $deprecated A deprecated argument.

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$this->action = apply_filters( 'wpforms_frontend_form_action', $this->action, $form_data, null );

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$form_classes = [ 'wpforms-validate', 'wpforms-form' ];

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if ( ! empty( $form_data['settings']['ajax_submit'] ) && ! $this->amp_obj->is_amp() ) {

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$form_classes[] = 'wpforms-ajax-form';

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}

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$form_atts = [

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'id' => sprintf( 'wpforms-form-%d', absint( $form_id ) ),

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'class' => $form_classes,

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'data' => [

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'formid' => absint( $form_id ),

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'atts' => [

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'method' => 'post',

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'enctype' => 'multipart/form-data',

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'action' => esc_url( $this->action ),

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];

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/**

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* Allow modifying form attributes.

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* @since 1.4.5

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* @param array $form_atts Form attributes.

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* @param array $form_data Form data and settings.

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$form_atts = apply_filters( 'wpforms_frontend_form_atts', $form_atts, $form_data );

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$this->form_container_open( $form_data, $form );

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/**

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* Fires before form output.

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* @since 1.5.4.2

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* @param array $form_data Form data.

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* @param WP_Post $form Form.

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do_action( 'wpforms_frontend_output_form_before', $form_data, $form );

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echo '<form ' . wpforms_html_attributes( $form_atts['id'], $form_atts['class'], $form_atts['data'], $form_atts['atts'] ) . '>';

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/**

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* Fires before closing the form.

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* @since 1.0.0

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* @param array $form_data Form data.

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* @param null $deprecated Null.

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* @param bool $title Whether to display form title.

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* @param bool $description Whether to display form description.

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* @param array $errors Form processing errors.

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do_action( 'wpforms_frontend_output', $form_data, null, $title, $description, $errors );

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echo '</form>';

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/**

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* Allow adding content after a form.

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* @since 1.5.4.2

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* @param array $form_data Form data and settings.

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* @param WP_Post $form Form post type.

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do_action( 'wpforms_frontend_output_form_after', $form_data, $form );

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$this->form_container_close( $form_data, $form );

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// Add form to class property that tracks all forms in a page.

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$this->forms[ $form_id ] = $form_data;

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// Optional debug information if WPFORMS_DEBUG is defined.

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wpforms_debug_data( $_POST ); // phpcs:ignore WordPress.Security.NonceVerification.Missing

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/**

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* Fires after frontend output.

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* @since 1.0.0

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* @param array $form_data Form data and settings.

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* @param WP_Post $form Form post type.

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do_action( 'wpforms_frontend_output_after', $form_data, $form );

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}

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/**

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* Get form.

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* @since 1.8.1

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* @param int $id Form id.

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* @return array|WP_Post|null

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* @noinspection NullPointerExceptionInspection

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private function get_form( $id ) {

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if ( empty( $id ) ) {

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return null;

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}

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// Grab the form data, if not found, then we bail.

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$form = wpforms()->get( 'form' )->get( (int) $id );

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if ( empty( $form ) ) {

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return null;

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}

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// We should display only the published form.

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if ( ! empty( $form->post_status ) && $form->post_status !== 'publish' ) {

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return null;

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}

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return $form;

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}

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/**

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* Check whether we should stop the output.

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* @since 1.8.1

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* @param WP_Post $form Form.

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* @param array $form_data Form data.

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* @return bool

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private function stop_output( $form, $form_data ): bool {

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$form_id = absint( $form->ID );

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/**

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* Is the form empty?

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* Check before output the form on the frontend.

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* @since 1.7.7

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* @param bool $form_is_empty Is the form empty?

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* @param array $form_data Form data.

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$form_is_empty = apply_filters( 'wpforms_frontend_output_form_is_empty', empty( $form_data['fields'] ), $form_data );

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// If the form does not contain any fields - do not proceed.

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if ( $form_is_empty ) {

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$this->render_obj->form_is_empty();

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return true;

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}

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// We need to stop output processing in case we are on AMP page.

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if ( $this->amp_obj->stop_output( $form_data ) ) {

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return true;

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}

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// Add url query var wpforms_form_id to track post_max_size overflows.

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if ( in_array( 'file-upload', wp_list_pluck( $form_data['fields'], 'type' ), true ) ) {

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$this->action = add_query_arg( 'wpforms_form_id', $form_id, $this->action );

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}

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/**

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* Fires before form data output.

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* @since 1.0.0

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* @param array $form_data Form data.

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* @param WP_Post $form Form.

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do_action( 'wpforms_frontend_output_before', $form_data, $form );

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if ( $this->output_success( $form, $form_data ) ) {

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return true;

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}

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/**

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* Allow filter to return early if some condition is not met.

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* @since 1.0.0

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* @param bool $load Load frontend flag.

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* @param array $form_data Form data.

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* @param null $deprecated Deprecated.

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if ( ! apply_filters( 'wpforms_frontend_load', true, $form_data, null ) ) {

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$this->form_container_open( $form_data, $form );

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/**

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* Fires when frontend is not loaded.

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* @since 1.4.8

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* @param array $form_data Form data.

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* @param WP_Post $form Form.

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do_action( 'wpforms_frontend_not_loaded', $form_data, $form );

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$this->form_container_close( $form_data, $form );

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return true;

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}

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return false;

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}

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/**

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* Get pages.

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* @since 1.8.1

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* @param array $form_data Form data.

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* @return array|false

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* @noinspection PhpTernaryExpressionCanBeReducedToShortVersionInspection

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* @noinspection ElvisOperatorCanBeUsedInspection

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private function get_pages( $form_data ) {

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$pages = wpforms_get_pagebreak_details( $form_data );

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return $pages ? $pages : false;

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}

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/**

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* Check whether output was successful.

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* @since 1.8.1

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* @param WP_Post $form Form.

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* @param array $form_data Form data.

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* @return bool

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private function output_success( $form, $form_data ): bool {

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$form_id = absint( $form->ID );

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$process = wpforms()->get( 'process' );

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$errors = empty( $process->errors[ $form_id ] ) ? [] : $process->errors[ $form_id ];

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// Check for return hash.

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if (

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// phpcs:ignore WordPress.Security.NonceVerification.Recommended

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! empty( $_GET['wpforms_return'] ) &&

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$process->valid_hash &&

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