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wp-content/plugins/jetpack/extensions/blocks/repeat-visitor/render.php

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+<?php
+/**
+ * Repeat Visitor block render implementation.
+ *
+ * Loaded lazily from repeat-visitor.php only when the block is rendered, to keep
+ * the render body out of the eager front-end PHP/opcache footprint.
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Repeat_Visitor;
+
+use Automattic\Jetpack\Blocks;
+use Jetpack_Gutenberg;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Repeat Visitor block dependency declaration.
+ *
+ * @param array  $attributes Array containing the block attributes.
+ * @param string $content    String containing the block content.
+ *
+ * @return string
+ */
+function render_block_implementation( $attributes, $content ) {
+	Jetpack_Gutenberg::load_assets_as_required( __DIR__ );
+
+	$classes = Blocks::classes( Blocks::get_block_feature( __DIR__ ), $attributes );
+
+	$count     = isset( $_COOKIE['jp-visit-counter'] ) ? (int) $_COOKIE['jp-visit-counter'] : 0;
+	$criteria  = $attributes['criteria'] ?? 'after-visits';
+	$threshold = isset( $attributes['threshold'] ) ? (int) $attributes['threshold'] : 3;
+
+	if (
+		( 'after-visits' === $criteria && $count >= $threshold ) ||
+		( 'before-visits' === $criteria && $count < $threshold )
+	) {
+		return $content;
+	}
+
+	// return an empty div so that view script increments the visit counter in the cookie.
+	return '<div class="' . esc_attr( $classes ) . '"></div>';
+}

wp-content/plugins/jetpack/extensions/blocks/repeat-visitor/repeat-visitor.php

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+<?php
+/**
+ * Repeat Visitor Block
+ *
+ * @since 7.2.0
+ *
+ * @package automattic/jetpack
+ */
+
+namespace Automattic\Jetpack\Extensions\Repeat_Visitor;
+
+use Automattic\Jetpack\Blocks;
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit( 0 );
+}
+
+/**
+ * Registers the block for use in Gutenberg
+ * This is done via an action so that we can disable
+ * registration if we need to.
+ */
+function register_block() {
+	Blocks::jetpack_register_block(
+		__DIR__,
+		array( 'render_callback' => __NAMESPACE__ . '\render_block' )
+	);
+}
+add_action( 'init', __NAMESPACE__ . '\register_block' );
+
+/**
+ * Repeat Visitor block dependency declaration.
+ *
+ * The render implementation lives in render.php and is only loaded when the
+ * block is actually rendered, keeping it out of the eager front-end path.
+ *
+ * @param array  $attributes Array containing the block attributes.
+ * @param string $content    String containing the block content.
+ *
+ * @return string
+ */
+function render_block( $attributes, $content ) {
+	require_once __DIR__ . '/render.php';
+	return render_block_implementation( $attributes, $content );
+}