wp_prepare_revisions_for_js

function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null ) {
	$post    = get_post( $post );
	$authors = array();
	$now_gmt = time();

	$revisions = wp_get_post_revisions(
		$post->ID,
		array(
			'order'         => 'ASC',
			'check_enabled' => false,
		)
	);
	// If revisions are disabled, we only want autosaves and the current post.
	if ( ! wp_revisions_enabled( $post ) ) {
		foreach ( $revisions as $revision_id => $revision ) {
			if ( ! wp_is_post_autosave( $revision ) ) {
				unset( $revisions[ $revision_id ] );
			}
		}
		$revisions = array( $post->ID => $post ) + $revisions;
	}

	$show_avatars = get_option( 'show_avatars' );

	cache_users( wp_list_pluck( $revisions, 'post_author' ) );

	$can_restore = current_user_can( 'edit_post', $post->ID );
	$current_id  = false;

	foreach ( $revisions as $revision ) {
		$modified     = strtotime( $revision->post_modified );
		$modified_gmt = strtotime( $revision->post_modified_gmt . ' +0000' );
		if ( $can_restore ) {
			$restore_link = str_replace(
				'&',
				'&',
				wp_nonce_url(
					add_query_arg(
						array(
							'revision' => $revision->ID,
							'action'   => 'restore',
						),
						admin_url( 'revision.php' )
					),
					"restore-post_{$revision->ID}"
				)
			);
		}

		if ( ! isset( $authors[ $revision->post_author ] ) ) {
			$authors[ $revision->post_author ] = array(
				'id'     => (int) $revision->post_author,
				'avatar' => $show_avatars ? get_avatar( $revision->post_author, 32 ) : '',
				'name'   => get_the_author_meta( 'display_name', $revision->post_author ),
			);
		}

		$autosave = (bool) wp_is_post_autosave( $revision );
		$current  = ! $autosave && $revision->post_modified_gmt === $post->post_modified_gmt;
		if ( $current && ! empty( $current_id ) ) {
			// If multiple revisions have the same post_modified_gmt, highest ID is current.
			if ( $current_id < $revision->ID ) {
				$revisions[ $current_id ]['current'] = false;
				$current_id                          = $revision->ID;
			} else {
				$current = false;
			}
		} elseif ( $current ) {
			$current_id = $revision->ID;
		}

		$revisions_data = array(
			'id'         => $revision->ID,
			'title'      => get_the_title( $post->ID ),
			'author'     => $authors[ $revision->post_author ],
			'date'       => date_i18n( __( 'M j, Y @ H:i' ), $modified ),
			'dateShort'  => date_i18n( _x( 'j M @ H:i', 'revision date short format' ), $modified ),
			/* translators: %s: Human-readable time difference. */
			'timeAgo'    => sprintf( __( '%s ago' ), human_time_diff( $modified_gmt, $now_gmt ) ),
			'autosave'   => $autosave,
			'current'    => $current,
			'restoreUrl' => $can_restore ? $restore_link : false,
		);

		/**
		 * Filters the array of revisions used on the revisions screen.
		 *
		 * @since 4.4.0
		 *
		 * @param array   $revisions_data {
		 *     The bootstrapped data for the revisions screen.
		 *
		 *     @type int        $id         Revision ID.
		 *     @type string     $title      Title for the revision's parent WP_Post object.
		 *     @type int        $author     Revision post author ID.
		 *     @type string     $date       Date the revision was modified.
		 *     @type string     $dateShort  Short-form version of the date the revision was modified.
		 *     @type string     $timeAgo    GMT-aware amount of time ago the revision was modified.
		 *     @type bool       $autosave   Whether the revision is an autosave.
		 *     @type bool       $current    Whether the revision is both not an autosave and the post
		 *                                  modified date matches the revision modified date (GMT-aware).
		 *     @type bool|false $restoreUrl URL if the revision can be restored, false otherwise.
		 * }
		 * @param WP_Post $revision       The revision's WP_Post object.
		 * @param WP_Post $post           The revision's parent WP_Post object.
		 */
		$revisions[ $revision->ID ] = apply_filters( 'wp_prepare_revision_for_js', $revisions_data, $revision, $post );
	}

	/**
	 * If we only have one revision, the initial revision is missing; This happens
	 * when we have an autsosave and the user has clicked 'View the Autosave'
	 */
	if ( 1 === sizeof( $revisions ) ) {
		$revisions[ $post->ID ] = array(
			'id'         => $post->ID,
			'title'      => get_the_title( $post->ID ),
			'author'     => $authors[ $post->post_author ],
			'date'       => date_i18n( __( 'M j, Y @ H:i' ), strtotime( $post->post_modified ) ),
			'dateShort'  => date_i18n( _x( 'j M @ H:i', 'revision date short format' ), strtotime( $post->post_modified ) ),
			/* translators: %s: Human-readable time difference. */
			'timeAgo'    => sprintf( __( '%s ago' ), human_time_diff( strtotime( $post->post_modified_gmt ), $now_gmt ) ),
			'autosave'   => false,
			'current'    => true,
			'restoreUrl' => false,
		);
		$current_id             = $post->ID;
	}

	/*
	 * If a post has been saved since the last revision (no revisioned fields
	 * were changed), we may not have a "current" revision. Mark the latest
	 * revision as "current".
	 */
	if ( empty( $current_id ) ) {
		if ( $revisions[ $revision->ID ]['autosave'] ) {
			$revision = end( $revisions );
			while ( $revision['autosave'] ) {
				$revision = prev( $revisions );
			}
			$current_id = $revision['id'];
		} else {
			$current_id = $revision->ID;
		}
		$revisions[ $current_id ]['current'] = true;
	}

	// Now, grab the initial diff.
	$compare_two_mode = is_numeric( $from );
	if ( ! $compare_two_mode ) {
		$found = array_search( $selected_revision_id, array_keys( $revisions ), true );
		if ( $found ) {
			$from = array_keys( array_slice( $revisions, $found - 1, 1, true ) );
			$from = reset( $from );
		} else {
			$from = 0;
		}
	}

	$from = absint( $from );

	$diffs = array(
		array(
			'id'     => $from . ':' . $selected_revision_id,
			'fields' => wp_get_revision_ui_diff( $post->ID, $from, $selected_revision_id ),
		),
	);

	return array(
		'postId'         => $post->ID,
		'nonce'          => wp_create_nonce( 'revisions-ajax-nonce' ),
		'revisionData'   => array_values( $revisions ),
		'to'             => $selected_revision_id,
		'from'           => $from,
		'diffData'       => $diffs,
		'baseUrl'        => parse_url( admin_url( 'revision.php' ), PHP_URL_PATH ),
		'compareTwoMode' => absint( $compare_two_mode ), // Apparently booleans are not allowed.
		'revisionIds'    => array_keys( $revisions ),
	);
}