<?php

/**

 * Dependencies API: WP_Scripts class

 *

 * @since 2.6.0

 *

 * @package WordPress

 * @subpackage Dependencies

 */

/**

 * Core class used to register scripts.

 *

 * @since 2.1.0

 *

 * @see WP_Dependencies

 */

class WP_Scripts extends WP_Dependencies {

	/**

	 * Base URL for scripts.

	 *

	 * Full URL with trailing slash.

	 *

	 * @since 2.6.0

	 * @var string

	 */

	public $base_url;

	/**

	 * URL of the content directory.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $content_url;

	/**

	 * Default version string for scripts.

	 *

	 * @since 2.6.0

	 * @var string

	 */

	public $default_version;

	/**

	 * Holds handles of scripts which are enqueued in footer.

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $in_footer = array();

	/**

	 * Holds a list of script handles which will be concatenated.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $concat = '';

	/**

	 * Holds a string which contains script handles and their version.

	 *

	 * @since 2.8.0

	 * @deprecated 3.4.0

	 * @var string

	 */

	public $concat_version = '';

	/**

	 * Whether to perform concatenation.

	 *

	 * @since 2.8.0

	 * @var bool

	 */

	public $do_concat = false;

	/**

	 * Holds HTML markup of scripts and additional data if concatenation

	 * is enabled.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $print_html = '';

	/**

	 * Holds inline code if concatenation is enabled.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $print_code = '';

	/**

	 * Holds a list of script handles which are not in the default directory

	 * if concatenation is enabled.

	 *

	 * Unused in core.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $ext_handles = '';

	/**

	 * Holds a string which contains handles and versions of scripts which

	 * are not in the default directory if concatenation is enabled.

	 *

	 * Unused in core.

	 *

	 * @since 2.8.0

	 * @var string

	 */

	public $ext_version = '';

	/**

	 * List of default directories.

	 *

	 * @since 2.8.0

	 * @var array

	 */

	public $default_dirs;

	/**

	 * Constructor.

	 *

	 * @since 2.6.0

	 */

	public function __construct() {

		$this->init();

		add_action( 'init', array( $this, 'init' ), 0 );

	}

	/**

	 * Initialize the class.

	 *

	 * @since 3.4.0

	 */

	public function init() {

		/**

		 * Fires when the WP_Scripts instance is initialized.

		 *

		 * @since 2.6.0

		 *

		 * @param WP_Scripts $this WP_Scripts instance (passed by reference).

		 */

		do_action_ref_array( 'wp_default_scripts', array( &$this ) );

	}

	/**

	 * Prints scripts.

	 *

	 * Prints the scripts passed to it or the print queue. Also prints all necessary dependencies.

	 *

	 * @since 2.1.0

	 * @since 2.8.0 Added the `$group` parameter.

	 *

	 * @param mixed $handles Optional. Scripts to be printed. (void) prints queue, (string) prints

	 *                       that script, (array of strings) prints those scripts. Default false.

	 * @param int   $group   Optional. If scripts were queued in groups prints this group number.

	 *                       Default false.

	 * @return array Scripts that have been printed.

	 */

	public function print_scripts( $handles = false, $group = false ) {

		return $this->do_items( $handles, $group );

	}

	/**

	 * Prints extra scripts of a registered script.

	 *

	 * @since 2.1.0

	 * @since 2.8.0 Added the `$echo` parameter.

	 * @deprecated 3.3.0

	 *

	 * @see print_extra_script()

	 *

	 * @param string $handle The script's registered handle.

	 * @param bool   $echo   Optional. Whether to echo the extra script instead of just returning it.

	 *                       Default true.

	 * @return bool|string|void Void if no data exists, extra scripts if `$echo` is true, true otherwise.

	 */

	public function print_scripts_l10n( $handle, $echo = true ) {

		_deprecated_function( __FUNCTION__, '3.3.0', 'WP_Scripts::print_extra_script()' );

		return $this->print_extra_script( $handle, $echo );

	}

	/**

	 * Prints extra scripts of a registered script.

	 *

	 * @since 3.3.0

	 *

	 * @param string $handle The script's registered handle.

	 * @param bool   $echo   Optional. Whether to echo the extra script instead of just returning it.

	 *                       Default true.

	 * @return bool|string|void Void if no data exists, extra scripts if `$echo` is true, true otherwise.

	 */

	public function print_extra_script( $handle, $echo = true ) {

		if ( ! $output = $this->get_data( $handle, 'data' ) ) {

			return;

		}

		if ( ! $echo ) {

			return $output;

		}

		echo "<script type='text/javascript'>\n"; // CDATA and type='text/javascript' is not needed for HTML 5.

		echo "/* <![CDATA[ */\n";

		echo "$output\n";

		echo "/* ]]> */\n";

		echo "</script>\n";

		return true;

	}

	/**

	 * Processes a script dependency.

	 *

	 * @since 2.6.0

	 * @since 2.8.0 Added the `$group` parameter.

	 *

	 * @see WP_Dependencies::do_item()

	 *

	 * @param string    $handle The script's registered handle.

	 * @param int|false $group  Optional. Group level: (int) level, (false) no groups. Default false.

	 * @return bool True on success, false on failure.

	 */

	public function do_item( $handle, $group = false ) {

		if ( ! parent::do_item( $handle ) ) {

			return false;

		}

		if ( 0 === $group && $this->groups[ $handle ] > 0 ) {

			$this->in_footer[] = $handle;

			return false;

		}

		if ( false === $group && in_array( $handle, $this->in_footer, true ) ) {

			$this->in_footer = array_diff( $this->in_footer, (array) $handle );

		}

		$obj = $this->registered[ $handle ];

		if ( null === $obj->ver ) {

			$ver = '';

		} else {

			$ver = $obj->ver ? $obj->ver : $this->default_version;

		}

		if ( isset( $this->args[ $handle ] ) ) {

			$ver = $ver ? $ver . '&' . $this->args[ $handle ] : $this->args[ $handle ];

		}

		$src         = $obj->src;

		$cond_before = $cond_after = '';

		$conditional = isset( $obj->extra['conditional'] ) ? $obj->extra['conditional'] : '';

		if ( $conditional ) {

			$cond_before = "<!--[if {$conditional}]>\n";

			$cond_after  = "<![endif]-->\n";

		}

		$before_handle = $this->print_inline_script( $handle, 'before', false );

		$after_handle  = $this->print_inline_script( $handle, 'after', false );

		if ( $before_handle ) {

			$before_handle = sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $before_handle );

		}

		if ( $after_handle ) {

			$after_handle = sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $after_handle );

		}

		if ( $before_handle || $after_handle ) {

			$inline_script_tag = "{$cond_before}{$before_handle}{$after_handle}{$cond_after}";

		} else {

			$inline_script_tag = '';

		}

		if ( $this->do_concat ) {

			/**

			 * Filters the script loader source.

			 *

			 * @since 2.2.0

			 *

			 * @param string $src    Script loader source path.

			 * @param string $handle Script handle.

			 */

			$srce = apply_filters( 'script_loader_src', $src, $handle );

			if ( $this->in_default_dir( $srce ) && ( $before_handle || $after_handle ) ) {

				$this->do_concat = false;

				// Have to print the so-far concatenated scripts right away to maintain the right order.

				_print_scripts();

				$this->reset();

			} elseif ( $this->in_default_dir( $srce ) && ! $conditional ) {

				$this->print_code     .= $this->print_extra_script( $handle, false );

				$this->concat         .= "$handle,";

				$this->concat_version .= "$handle$ver";

				return true;

			} else {

				$this->ext_handles .= "$handle,";

				$this->ext_version .= "$handle$ver";

			}

		}

		$has_conditional_data = $conditional && $this->get_data( $handle, 'data' );

		if ( $has_conditional_data ) {

			echo $cond_before;

		}

		$this->print_extra_script( $handle );

		if ( $has_conditional_data ) {

			echo $cond_after;

		}

		// A single item may alias a set of items, by having dependencies, but no source.

		if ( ! $src ) {

			if ( $inline_script_tag ) {

				if ( $this->do_concat ) {

					$this->print_html .= $inline_script_tag;

				} else {

					echo $inline_script_tag;

				}

			}

			return true;

		}

		$translations = $this->print_translations( $handle, false );

		if ( $translations ) {

			$translations = sprintf( "<script type='text/javascript'>\n%s\n</script>\n", $translations );

		}

		if ( ! preg_match( '|^(https?:)?//|', $src ) && ! ( $this->content_url && 0 === strpos( $src, $this->content_url ) ) ) {

			$src = $this->base_url . $src;

		}

		if ( ! empty( $ver ) ) {

			$src = add_query_arg( 'ver', $ver, $src );

		}

		/** This filter is documented in wp-includes/class.wp-scripts.php */

		$src = esc_url( apply_filters( 'script_loader_src', $src, $handle ) );

		if ( ! $src ) {

			return true;

		}

		$tag = "{$translations}{$cond_before}{$before_handle}<script type='text/javascript' src='$src'></script>\n{$after_handle}{$cond_after}";

		/**

		 * Filters the HTML script tag of an enqueued script.

		 *

		 * @since 4.1.0

		 *

		 * @param string $tag    The `<script>` tag for the enqueued script.

		 * @param string $handle The script's registered handle.

		 * @param string $src    The script's source URL.

		 */

		$tag = apply_filters( 'script_loader_tag', $tag, $handle, $src );

		if ( $this->do_concat ) {

			$this->print_html .= $tag;

		} else {

			echo $tag;

		}

		return true;

	}

	/**

	 * Adds extra code to a registered script.

	 *

	 * @since 4.5.0

	 *

	 * @param string $handle   Name of the script to add the inline script to. Must be lowercase.

	 * @param string $data     String containing the javascript to be added.

	 * @param string $position Optional. Whether to add the inline script before the handle

	 *                         or after. Default 'after'.

	 * @return bool True on success, false on failure.

	 */

	public function add_inline_script( $handle, $data, $position = 'after' ) {

		if ( ! $data ) {

			return false;

		}

		if ( 'after' !== $position ) {

			$position = 'before';

		}

		$script   = (array) $this->get_data( $handle, $position );

		$script[] = $data;

		return $this->add_data( $handle, $position, $script );

	}

	/**

	 * Prints inline scripts registered for a specific handle.

	 *

	 * @since 4.5.0

	 *

	 * @param string $handle   Name of the script to add the inline script to. Must be lowercase.

	 * @param string $position Optional. Whether to add the inline script before the handle

	 *                         or after. Default 'after'.

	 * @param bool   $echo     Optional. Whether to echo the script instead of just returning it.

	 *                         Default true.

	 * @return string|false Script on success, false otherwise.

	 */

	public function print_inline_script( $handle, $position = 'after', $echo = true ) {

		$output = $this->get_data( $handle, $position );

		if ( empty( $output ) ) {

			return false;

		}