<?php

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/**

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* SVG icons related functions

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*

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* @package WordPress

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* @subpackage Twenty_Nineteen

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* @since Twenty Nineteen 1.0

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*/

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/**

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* Gets the SVG code for a given icon.

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*/

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function twentynineteen_get_icon_svg( $icon, $size = 24 ) {

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return TwentyNineteen_SVG_Icons::get_svg( 'ui', $icon, $size );

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}

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/**

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* Gets the SVG code for a given social icon.

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*/

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function twentynineteen_get_social_icon_svg( $icon, $size = 24 ) {

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return TwentyNineteen_SVG_Icons::get_svg( 'social', $icon, $size );

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}

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/**

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* Detects the social network from a URL and returns the SVG code for its icon.

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*/

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function twentynineteen_get_social_link_svg( $uri, $size = 24 ) {

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return TwentyNineteen_SVG_Icons::get_social_link_svg( $uri, $size );

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}

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/**

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* Display SVG icons in social links menu.

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*

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* @param string $item_output The menu item's starting HTML output.

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* @param WP_Post $item Menu item data object.

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* @param int $depth Depth of the menu. Used for padding.

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* @param stdClass $args An object of wp_nav_menu() arguments.

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* @return string The menu item output with social icon.

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*/

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function twentynineteen_nav_menu_social_icons( $item_output, $item, $depth, $args ) {

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// Change SVG icon inside social links menu if there is supported URL.

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if ( 'social' === $args->theme_location ) {

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$svg = twentynineteen_get_social_link_svg( $item->url, 26 );

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if ( empty( $svg ) ) {

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$svg = twentynineteen_get_icon_svg( 'link' );

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}

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$item_output = str_replace( $args->link_after, '</span>' . $svg, $item_output );

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}

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return $item_output;

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}

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add_filter( 'walker_nav_menu_start_el', 'twentynineteen_nav_menu_social_icons', 10, 4 );

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/**

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* Add a dropdown icon to top-level menu items.

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*

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* @param string $item_output The menu item's starting HTML output.

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* @param WP_Post $item Menu item data object.

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* @param int $depth Depth of the menu. Used for padding.

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* @param stdClass $args An object of wp_nav_menu() arguments.

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* @return string Nav menu item start element.

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*/

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function twentynineteen_add_dropdown_icons( $item_output, $item, $depth, $args ) {

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// Only add class to 'top level' items on the 'primary' menu.

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if ( ! isset( $args->theme_location ) || 'menu-1' !== $args->theme_location ) {

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return $item_output;

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}

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if ( in_array( 'mobile-parent-nav-menu-item', $item->classes, true ) && isset( $item->original_id ) ) {

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// Inject the keyboard_arrow_left SVG inside the parent nav menu item, and let the item link to the parent item.

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// @todo Only do this for nested submenus? If on a first-level submenu, then really the link could be "#" since the desire is to remove the target entirely.

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$link = sprintf(

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'<button class="menu-item-link-return" tabindex="-1">%s',

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twentynineteen_get_icon_svg( 'chevron_left', 24 )

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);

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// Replace opening <a> with <button>.

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$item_output = preg_replace(

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'/<a\s.*?>/',

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$link,

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$item_output,

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1 // Limit.

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);

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// Replace closing </a> with </button>.

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$item_output = preg_replace(

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'#</a>#i',

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'</button>',

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$item_output,

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1 // Limit.

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);

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} elseif ( in_array( 'menu-item-has-children', $item->classes, true ) ) {

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// Add SVG icon to parent items.

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$icon = twentynineteen_get_icon_svg( 'keyboard_arrow_down', 24 );

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$item_output .= sprintf(

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'<button class="submenu-expand" tabindex="-1">%s</button>',

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$icon

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);

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}

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return $item_output;

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}

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add_filter( 'walker_nav_menu_start_el', 'twentynineteen_add_dropdown_icons', 10, 4 );

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