--- /dev/null
+<?php
+/**
+ * SVG icons related functions and filters
+ *
+ * @package WordPress
+ * @subpackage Twenty_Seventeen
+ * @since 1.0
+ */
+
+/**
+ * Add SVG definitions to the footer.
+ */
+function twentyseventeen_include_svg_icons() {
+ // Define SVG sprite file.
+ $svg_icons = get_parent_theme_file_path( '/assets/images/svg-icons.svg' );
+
+ // If it exists, include it.
+ if ( file_exists( $svg_icons ) ) {
+ require_once( $svg_icons );
+ }
+}
+add_action( 'wp_footer', 'twentyseventeen_include_svg_icons', 9999 );
+
+/**
+ * Return SVG markup.
+ *
+ * @param array $args {
+ * Parameters needed to display an SVG.
+ *
+ * @type string $icon Required SVG icon filename.
+ * @type string $title Optional SVG title.
+ * @type string $desc Optional SVG description.
+ * }
+ * @return string SVG markup.
+ */
+function twentyseventeen_get_svg( $args = array() ) {
+ // Make sure $args are an array.
+ if ( empty( $args ) ) {
+ return __( 'Please define default parameters in the form of an array.', 'twentyseventeen' );
+ }
+
+ // Define an icon.
+ if ( false === array_key_exists( 'icon', $args ) ) {
+ return __( 'Please define an SVG icon filename.', 'twentyseventeen' );
+ }
+
+ // Set defaults.
+ $defaults = array(
+ 'icon' => '',
+ 'title' => '',
+ 'desc' => '',
+ 'fallback' => false,
+ );
+
+ // Parse args.
+ $args = wp_parse_args( $args, $defaults );
+
+ // Set aria hidden.
+ $aria_hidden = ' aria-hidden="true"';
+
+ // Set ARIA.
+ $aria_labelledby = '';
+
+ /*
+ * Twenty Seventeen doesn't use the SVG title or description attributes; non-decorative icons are described with .screen-reader-text.
+ *
+ * However, child themes can use the title and description to add information to non-decorative SVG icons to improve accessibility.
+ *
+ * Example 1 with title: <?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right', 'title' => __( 'This is the title', 'textdomain' ) ) ); ?>
+ *
+ * Example 2 with title and description: <?php echo twentyseventeen_get_svg( array( 'icon' => 'arrow-right', 'title' => __( 'This is the title', 'textdomain' ), 'desc' => __( 'This is the description', 'textdomain' ) ) ); ?>
+ *
+ * See https://www.paciellogroup.com/blog/2013/12/using-aria-enhance-svg-accessibility/.
+ */
+ if ( $args['title'] ) {
+ $aria_hidden = '';
+ $unique_id = uniqid();
+ $aria_labelledby = ' aria-labelledby="title-' . $unique_id . '"';
+
+ if ( $args['desc'] ) {
+ $aria_labelledby = ' aria-labelledby="title-' . $unique_id . ' desc-' . $unique_id . '"';
+ }
+ }
+
+ // Begin SVG markup.
+ $svg = '<svg class="icon icon-' . esc_attr( $args['icon'] ) . '"' . $aria_hidden . $aria_labelledby . ' role="img">';
+
+ // Display the title.
+ if ( $args['title'] ) {
+ $svg .= '<title id="title-' . $unique_id . '">' . esc_html( $args['title'] ) . '</title>';
+
+ // Display the desc only if the title is already set.
+ if ( $args['desc'] ) {
+ $svg .= '<desc id="desc-' . $unique_id . '">' . esc_html( $args['desc'] ) . '</desc>';
+ }
+ }
+
+ /*
+ * Display the icon.
+ *
+ * The whitespace around `<use>` is intentional - it is a work around to a keyboard navigation bug in Safari 10.
+ *
+ * See https://core.trac.wordpress.org/ticket/38387.
+ */
+ $svg .= ' <use href="#icon-' . esc_html( $args['icon'] ) . '" xlink:href="#icon-' . esc_html( $args['icon'] ) . '"></use> ';
+
+ // Add some markup to use as a fallback for browsers that do not support SVGs.
+ if ( $args['fallback'] ) {
+ $svg .= '<span class="svg-fallback icon-' . esc_attr( $args['icon'] ) . '"></span>';
+ }
+
+ $svg .= '</svg>';
+
+ return $svg;
+}
+
+/**
+ * Display SVG icons in social links menu.
+ *
+ * @param string $item_output The menu item output.
+ * @param WP_Post $item Menu item object.
+ * @param int $depth Depth of the menu.
+ * @param array $args wp_nav_menu() arguments.
+ * @return string $item_output The menu item output with social icon.
+ */
+function twentyseventeen_nav_menu_social_icons( $item_output, $item, $depth, $args ) {
+ // Get supported social icons.
+ $social_icons = twentyseventeen_social_links_icons();
+
+ // Change SVG icon inside social links menu if there is supported URL.
+ if ( 'social' === $args->theme_location ) {
+ foreach ( $social_icons as $attr => $value ) {
+ if ( false !== strpos( $item_output, $attr ) ) {
+ $item_output = str_replace( $args->link_after, '</span>' . twentyseventeen_get_svg( array( 'icon' => esc_attr( $value ) ) ), $item_output );
+ }
+ }
+ }
+
+ return $item_output;
+}
+add_filter( 'walker_nav_menu_start_el', 'twentyseventeen_nav_menu_social_icons', 10, 4 );
+
+/**
+ * Add dropdown icon if menu item has children.
+ *
+ * @param string $title The menu item's title.
+ * @param object $item The current menu item.
+ * @param array $args An array of wp_nav_menu() arguments.
+ * @param int $depth Depth of menu item. Used for padding.
+ * @return string $title The menu item's title with dropdown icon.
+ */
+function twentyseventeen_dropdown_icon_to_menu_link( $title, $item, $args, $depth ) {
+ if ( 'top' === $args->theme_location ) {
+ foreach ( $item->classes as $value ) {
+ if ( 'menu-item-has-children' === $value || 'page_item_has_children' === $value ) {
+ $title = $title . twentyseventeen_get_svg( array( 'icon' => 'angle-down' ) );
+ }
+ }
+ }
+
+ return $title;
+}
+add_filter( 'nav_menu_item_title', 'twentyseventeen_dropdown_icon_to_menu_link', 10, 4 );
+
+/**
+ * Returns an array of supported social links (URL and icon name).
+ *
+ * @return array $social_links_icons
+ */
+function twentyseventeen_social_links_icons() {
+ // Supported social links icons.
+ $social_links_icons = array(
+ 'behance.net' => 'behance',
+ 'codepen.io' => 'codepen',
+ 'deviantart.com' => 'deviantart',
+ 'digg.com' => 'digg',
+ 'dribbble.com' => 'dribbble',
+ 'dropbox.com' => 'dropbox',
+ 'facebook.com' => 'facebook',
+ 'flickr.com' => 'flickr',
+ 'foursquare.com' => 'foursquare',
+ 'plus.google.com' => 'google-plus',
+ 'github.com' => 'github',
+ 'instagram.com' => 'instagram',
+ 'linkedin.com' => 'linkedin',
+ 'mailto:' => 'envelope-o',
+ 'medium.com' => 'medium',
+ 'pinterest.com' => 'pinterest-p',
+ 'getpocket.com' => 'get-pocket',
+ 'reddit.com' => 'reddit-alien',
+ 'skype.com' => 'skype',
+ 'skype:' => 'skype',
+ 'slideshare.net' => 'slideshare',
+ 'snapchat.com' => 'snapchat-ghost',
+ 'soundcloud.com' => 'soundcloud',
+ 'spotify.com' => 'spotify',
+ 'stumbleupon.com' => 'stumbleupon',
+ 'tumblr.com' => 'tumblr',
+ 'twitch.tv' => 'twitch',
+ 'twitter.com' => 'twitter',
+ 'vimeo.com' => 'vimeo',
+ 'vine.co' => 'vine',
+ 'vk.com' => 'vk',
+ 'wordpress.org' => 'wordpress',
+ 'wordpress.com' => 'wordpress',
+ 'yelp.com' => 'yelp',
+ 'youtube.com' => 'youtube',
+ );
+
+ /**
+ * Filter Twenty Seventeen social links icons.
+ *
+ * @since Twenty Seventeen 1.0
+ *
+ * @param array $social_links_icons
+ */
+ return apply_filters( 'twentyseventeen_social_links_icons', $social_links_icons );
+}
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