As the sun rises and the forest mist clears, and the clouds return and the caves darken, these changes of light and shadow are the morning and evening in the mountains. Wildflowers bloom with their subtle fragrance, fine trees flourish with their dense shade, the wind and frost are pure and clean, and the water recedes to reveal the rocks—these are the four seasons in the mountains. Going out in the morning and returning in the evening, the scenery of the four seasons is different, and the joy is endless.至于负者歌于途,行者休于树,前者呼,后者应,伛偻提携,往来而不绝者,滁人游也。临溪而渔,溪深而鱼肥,酿泉为酒,泉香而酒洌,山肴野蔌,杂然而前陈者,太守宴也。宴酣之乐,非丝非竹,射者中,弈者胜,觥筹交错,起坐而喧哗者,众宾欢也。苍颜白发,颓然乎其间者,太守醉也。
<?php
/**
* Post API: Walker_Page class
*
* @package WordPress
* @subpackage Template
* @since 4.4.0
*/
/**
* Core walker class used to create an HTML list of pages.
*
* @since 2.1.0
*
* @see Walker
*/
class Walker_Page extends Walker {
/**
* What the class handles.
*
* @since 2.1.0
* @var string
*
* @see Walker::$tree_type
*/
public $tree_type = 'page';
/**
* Database fields to use.
*
* @since 2.1.0
* @var string[]
*
* @see Walker::$db_fields
* @todo Decouple this.
*/
public $db_fields = array(
'parent' => 'post_parent',
'id' => 'ID',
);
/**
* Outputs the beginning of the current level in the tree before elements are output.
*
* @since 2.1.0
*
* @see Walker::start_lvl()
*
* @param string $output Used to append additional content (passed by reference).
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Arguments for outputting the next level.
* Default empty array.
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
$indent = str_repeat( $t, $depth );
$output .= "{$n}{$indent}<ul class='children'>{$n}";
}
/**
* Outputs the end of the current level in the tree after elements are output.
*
* @since 2.1.0
*
* @see Walker::end_lvl()
*
* @param string $output Used to append additional content (passed by reference).
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Arguments for outputting the end of the current level.
* Default empty array.
*/
public function end_lvl( &$output, $depth = 0, $args = array() ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
$indent = str_repeat( $t, $depth );
$output .= "{$indent}</ul>{$n}";
}
/**
* Outputs the beginning of the current element in the tree.
*
* @see Walker::start_el()
* @since 2.1.0
* @since 5.9.0 Renamed `$page` to `$data_object` and `$current_page` to `$current_object_id`
* to match parent class for PHP 8 named parameter support.
*
* @param string $output Used to append additional content. Passed by reference.
* @param WP_Post $data_object Page data object.
* @param int $depth Optional. Depth of page. Used for padding. Default 0.
* @param array $args Optional. Array of arguments. Default empty array.
* @param int $current_object_id Optional. ID of the current page. Default 0.
*/
public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {
// Restores the more descriptive, specific name for use within this method.
$page = $data_object;
$current_page_id = $current_object_id;
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
if ( $depth ) {
$indent = str_repeat( $t, $depth );
} else {
$indent = '';
}
$css_class = array( 'page_item', 'page-item-' . $page->ID );
if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {
$css_class[] = 'page_item_has_children';
}
if ( ! empty( $current_page_id ) ) {
$_current_page = get_post( $current_page_id );
if ( $_current_page && in_array( $page->ID, $_current_page->ancestors, true ) ) {
$css_class[] = 'current_page_ancestor';
}
if ( $page->ID === (int) $current_page_id ) {
$css_class[] = 'current_page_item';
} elseif ( $_current_page && $page->ID === $_current_page->post_parent ) {
$css_class[] = 'current_page_parent';
}
} elseif ( (int) get_option( 'page_for_posts' ) === $page->ID ) {
$css_class[] = 'current_page_parent';
}
/**
* Filters the list of CSS classes to include with each page item in the list.
*
* @since 2.8.0
*
* @see wp_list_pages()
*
* @param string[] $css_class An array of CSS classes to be applied to each list item.
* @param WP_Post $page Page data object.
* @param int $depth Depth of page, used for padding.
* @param array $args An array of arguments.
* @param int $current_page_id ID of the current page.
*/
$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page_id ) );
$css_classes = $css_classes ? ' class="' . esc_attr( $css_classes ) . '"' : '';
if ( '' === $page->post_title ) {
/* translators: %d: ID of a post. */
$page->post_title = sprintf( __( '#%d (no title)' ), $page->ID );
}
$args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];
$args['link_after'] = empty( $args['link_after'] ) ? '' : $args['link_after'];
$atts = array();
$atts['href'] = get_permalink( $page->ID );
$atts['aria-current'] = ( $page->ID === (int) $current_page_id ) ? 'page' : '';
/**
* Filters the HTML attributes applied to a page menu item's anchor element.
*
* @since 4.8.0
*
* @param array $atts {
* The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
*
* @type string $href The href attribute.
* @type string $aria-current The aria-current attribute.
* }
* @param WP_Post $page Page data object.
* @param int $depth Depth of page, used for padding.
* @param array $args An array of arguments.
* @param int $current_page_id ID of the current page.
*/
$atts = apply_filters( 'page_menu_link_attributes', $atts, $page, $depth, $args, $current_page_id );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( is_scalar( $value ) && '' !== $value && false !== $value ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
$output .= $indent . sprintf(
'<li%s><a%s>%s%s%s</a>',
$css_classes,
$attributes,
$args['link_before'],
/** This filter is documented in wp-includes/post-template.php */
apply_filters( 'the_title', $page->post_title, $page->ID ),
$args['link_after']
);
if ( ! empty( $args['show_date'] ) ) {
if ( 'modified' === $args['show_date'] ) {
$time = $page->post_modified;
} else {
$time = $page->post_date;
}
$date_format = empty( $args['date_format'] ) ? '' : $args['date_format'];
$output .= ' ' . mysql2date( $date_format, $time );
}
}
/**
* Outputs the end of the current element in the tree.
*
* @since 2.1.0
* @since 5.9.0 Renamed `$page` to `$data_object` to match parent class for PHP 8 named parameter support.
*
* @see Walker::end_el()
*
* @param string $output Used to append additional content. Passed by reference.
* @param WP_Post $data_object Page data object. Not used.
* @param int $depth Optional. Depth of page. Default 0 (unused).
* @param array $args Optional. Array of arguments. Default empty array.
*/
public function end_el( &$output, $data_object, $depth = 0, $args = array() ) {
if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {
$t = "\t";
$n = "\n";
} else {
$t = '';
$n = '';
}
$output .= "</li>{$n}";
}
}