wp-bootstrap /
wp-bootstrap-navwalker
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like WP_Bootstrap_Navwalker often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use WP_Bootstrap_Navwalker, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 29 | class WP_Bootstrap_Navwalker extends Walker_Nav_Menu { |
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| 30 | |||
| 31 | /** |
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| 32 | * Starts the list before the elements are added. |
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| 33 | * |
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| 34 | * @since WP 3.0.0 |
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| 35 | * |
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| 36 | * @see Walker_Nav_Menu::start_lvl() |
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| 37 | * |
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| 38 | * @param string $output Used to append additional content (passed by reference). |
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| 39 | * @param int $depth Depth of menu item. Used for padding. |
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| 40 | * @param stdClass $args An object of wp_nav_menu() arguments. |
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| 41 | */ |
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| 42 | public function start_lvl( &$output, $depth = 0, $args = array() ) { |
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| 81 | |||
| 82 | /** |
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| 83 | * Starts the element output. |
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| 84 | * |
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| 85 | * @since WP 3.0.0 |
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| 86 | * @since WP 4.4.0 The {@see 'nav_menu_item_args'} filter was added. |
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| 87 | * |
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| 88 | * @see Walker_Nav_Menu::start_el() |
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| 89 | * |
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| 90 | * @param string $output Used to append additional content (passed by reference). |
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| 91 | * @param WP_Post $item Menu item data object. |
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| 92 | * @param int $depth Depth of menu item. Used for padding. |
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| 93 | * @param stdClass $args An object of wp_nav_menu() arguments. |
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| 94 | * @param int $id Current item ID. |
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| 95 | */ |
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| 96 | public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) { |
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| 97 | View Code Duplication | if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) { |
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| 98 | $t = ''; |
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| 99 | $n = ''; |
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| 100 | } else { |
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| 101 | $t = "\t"; |
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| 102 | $n = "\n"; |
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| 103 | } |
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| 104 | $indent = ( $depth ) ? str_repeat( $t, $depth ) : ''; |
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| 105 | |||
| 106 | $classes = empty( $item->classes ) ? array() : (array) $item->classes; |
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| 107 | |||
| 108 | // Initialize some holder variables to store specially handled item |
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| 109 | // wrappers and icons. |
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| 110 | $linkmod_classes = array(); |
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| 111 | $icon_classes = array(); |
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| 112 | |||
| 113 | /** |
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| 114 | * Get an updated $classes array without linkmod or icon classes. |
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| 115 | * |
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| 116 | * NOTE: linkmod and icon class arrays are passed by reference and |
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| 117 | * are maybe modified before being used later in this function. |
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| 118 | */ |
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| 119 | $classes = self::seporate_linkmods_and_icons_from_classes( $classes, $linkmod_classes, $icon_classes, $depth ); |
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| 120 | |||
| 121 | // Join any icon classes plucked from $classes into a string. |
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| 122 | $icon_class_string = join( ' ', $icon_classes ); |
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| 123 | |||
| 124 | /** |
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| 125 | * Filters the arguments for a single nav menu item. |
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| 126 | * |
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| 127 | * WP 4.4.0 |
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| 128 | * |
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| 129 | * @param stdClass $args An object of wp_nav_menu() arguments. |
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| 130 | * @param WP_Post $item Menu item data object. |
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| 131 | * @param int $depth Depth of menu item. Used for padding. |
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| 132 | */ |
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| 133 | $args = apply_filters( 'nav_menu_item_args', $args, $item, $depth ); |
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| 134 | |||
| 135 | // Add .dropdown or .active classes where they are needed. |
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| 136 | if ( isset( $args->has_children ) && $args->has_children ) { |
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| 137 | $classes[] = 'dropdown'; |
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| 138 | } |
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| 139 | if ( in_array( 'current-menu-item', $classes, true ) || in_array( 'current-menu-parent', $classes, true ) ) { |
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| 140 | $classes[] = 'active'; |
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| 141 | } |
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| 142 | |||
| 143 | // Add some additional default classes to the item. |
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| 144 | $classes[] = 'menu-item-' . $item->ID; |
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| 145 | $classes[] = 'nav-item'; |
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| 146 | |||
| 147 | // Allow filtering the classes. |
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| 148 | $classes = apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ); |
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| 149 | |||
| 150 | // Form a string of classes in format: class="class_names". |
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| 151 | $class_names = join( ' ', $classes ); |
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| 152 | $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : ''; |
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| 153 | |||
| 154 | /** |
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| 155 | * Filters the ID applied to a menu item's list item element. |
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| 156 | * |
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| 157 | * @since WP 3.0.1 |
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| 158 | * @since WP 4.1.0 The `$depth` parameter was added. |
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| 159 | * |
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| 160 | * @param string $menu_id The ID that is applied to the menu item's `<li>` element. |
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| 161 | * @param WP_Post $item The current menu item. |
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| 162 | * @param stdClass $args An object of wp_nav_menu() arguments. |
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| 163 | * @param int $depth Depth of menu item. Used for padding. |
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| 164 | */ |
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| 165 | $id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args, $depth ); |
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| 166 | $id = $id ? ' id="' . esc_attr( $id ) . '"' : ''; |
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| 167 | |||
| 168 | $output .= $indent . '<li itemscope="itemscope" itemtype="https://www.schema.org/SiteNavigationElement"' . $id . $class_names . '>'; |
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| 169 | |||
| 170 | // initialize array for holding the $atts for the link item. |
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| 171 | $atts = array(); |
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| 172 | |||
| 173 | // Set title from item to the $atts array - if title is empty then |
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| 174 | // default to item title. |
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| 175 | if ( empty( $item->attr_title ) ) { |
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| 176 | $atts['title'] = ! empty( $item->title ) ? strip_tags( $item->title ) : ''; |
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| 177 | } else { |
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| 178 | $atts['title'] = $item->attr_title; |
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| 179 | } |
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| 180 | |||
| 181 | $atts['target'] = ! empty( $item->target ) ? $item->target : ''; |
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| 182 | $atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : ''; |
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| 183 | // If item has_children add atts to <a>. |
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| 184 | if ( isset( $args->has_children ) && $args->has_children && 0 === $depth && $args->depth > 1 ) { |
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| 185 | $atts['href'] = '#'; |
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| 186 | $atts['data-toggle'] = 'dropdown'; |
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| 187 | $atts['aria-haspopup'] = 'true'; |
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| 188 | $atts['aria-expanded'] = 'false'; |
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| 189 | $atts['class'] = 'dropdown-toggle nav-link'; |
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| 190 | $atts['id'] = 'menu-item-dropdown-' . $item->ID; |
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| 191 | } else { |
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| 192 | $atts['href'] = ! empty( $item->url ) ? $item->url : '#'; |
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| 193 | // Items in dropdowns use .dropdown-item instead of .nav-link. |
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| 194 | if ( $depth > 0 ) { |
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| 195 | $atts['class'] = 'dropdown-item'; |
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| 196 | } else { |
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| 197 | $atts['class'] = 'nav-link'; |
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| 198 | } |
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| 199 | } |
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| 200 | |||
| 201 | // update atts of this item based on any custom linkmod classes. |
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| 202 | $atts = self::update_atts_for_linkmod_type( $atts, $linkmod_classes ); |
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| 203 | // Allow filtering of the $atts array before using it. |
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| 204 | $atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth ); |
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| 205 | |||
| 206 | // Build a string of html containing all the atts for the item. |
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| 207 | $attributes = ''; |
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| 208 | foreach ( $atts as $attr => $value ) { |
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| 209 | if ( ! empty( $value ) ) { |
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| 210 | $value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value ); |
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| 211 | $attributes .= ' ' . $attr . '="' . $value . '"'; |
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| 212 | } |
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| 213 | } |
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| 214 | |||
| 215 | /** |
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| 216 | * Set a typeflag to easily test if this is a linkmod or not. |
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| 217 | */ |
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| 218 | $linkmod_type = self::get_linkmod_type( $linkmod_classes ); |
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| 219 | |||
| 220 | /** |
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| 221 | * START appending the internal item contents to the output. |
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| 222 | */ |
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| 223 | $item_output = isset( $args->before ) ? $args->before : ''; |
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| 224 | /** |
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| 225 | * This is the start of the internal nav item. Depending on what |
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| 226 | * kind of linkmod we have we may need different wrapper elements. |
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| 227 | */ |
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| 228 | if ( '' !== $linkmod_type ) { |
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| 229 | // is linkmod, output the required element opener. |
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| 230 | $item_output .= self::linkmod_element_open( $linkmod_type, $attributes ); |
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| 231 | } else { |
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| 232 | // With no link mod type set this must be a standard <a> tag. |
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| 233 | $item_output .= '<a' . $attributes . '>'; |
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| 234 | } |
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| 235 | |||
| 236 | /** |
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| 237 | * Initiate empty icon var, then if we have a string containing any |
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| 238 | * icon classes form the icon markup with an <i> element. This is |
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| 239 | * output inside of the item before the $title (the link text). |
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| 240 | */ |
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| 241 | $icon_html = ''; |
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| 242 | if ( ! empty( $icon_class_string ) ) { |
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| 243 | // append an <i> with the icon classes to what is output before links. |
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| 244 | $icon_html = '<i class="' . esc_attr( $icon_class_string ) . '" aria-hidden="true"></i> '; |
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| 245 | } |
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| 246 | |||
| 247 | /** This filter is documented in wp-includes/post-template.php */ |
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| 248 | $title = apply_filters( 'the_title', $item->title, $item->ID ); |
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| 249 | |||
| 250 | /** |
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| 251 | * Filters a menu item's title. |
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| 252 | * |
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| 253 | * @since WP 4.4.0 |
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| 254 | * |
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| 255 | * @param string $title The menu item's title. |
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| 256 | * @param WP_Post $item The current menu item. |
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| 257 | * @param stdClass $args An object of wp_nav_menu() arguments. |
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| 258 | * @param int $depth Depth of menu item. Used for padding. |
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| 259 | */ |
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| 260 | $title = apply_filters( 'nav_menu_item_title', $title, $item, $args, $depth ); |
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| 261 | |||
| 262 | /** |
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| 263 | * If the .sr-only class was set apply to the nav items text only. |
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| 264 | */ |
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| 265 | if ( in_array( 'sr-only', $linkmod_classes, true ) ) { |
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| 266 | $title = self::wrap_for_screen_reader( $title ); |
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| 267 | $keys_to_unset = array_keys( $linkmod_classes, 'sr-only' ); |
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| 268 | foreach ( $keys_to_unset as $k ) { |
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| 269 | unset( $linkmod_classes[ $k ] ); |
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| 270 | } |
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| 271 | } |
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| 272 | |||
| 273 | // Put the item contents into $output. |
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| 274 | $item_output .= isset( $args->link_before ) ? $args->link_before . $icon_html . $title . $args->link_after : ''; |
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| 275 | /** |
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| 276 | * This is the end of the internal nav item. We need to close the |
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| 277 | * correct element depending on the type of link or link mod. |
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| 278 | */ |
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| 279 | if ( '' !== $linkmod_type ) { |
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| 280 | // is linkmod, output the required element opener. |
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| 281 | $item_output .= self::linkmod_element_close( $linkmod_type, $attributes ); |
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| 282 | } else { |
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| 283 | // With no link mod type set this must be a standard <a> tag. |
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| 284 | $item_output .= '</a>'; |
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| 285 | } |
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| 286 | |||
| 287 | $item_output .= isset( $args->after ) ? $args->after : ''; |
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| 288 | |||
| 289 | /** |
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| 290 | * END appending the internal item contents to the output. |
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| 291 | */ |
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| 292 | $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args ); |
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| 293 | |||
| 294 | } |
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| 295 | |||
| 296 | /** |
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| 297 | * Traverse elements to create list from elements. |
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| 298 | * |
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| 299 | * Display one element if the element doesn't have any children otherwise, |
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| 300 | * display the element and its children. Will only traverse up to the max |
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| 301 | * depth and no ignore elements under that depth. It is possible to set the |
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| 302 | * max depth to include all depths, see walk() method. |
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| 303 | * |
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| 304 | * This method should not be called directly, use the walk() method instead. |
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| 305 | * |
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| 306 | * @since WP 2.5.0 |
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| 307 | * |
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| 308 | * @see Walker::start_lvl() |
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| 309 | * |
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| 310 | * @param object $element Data object. |
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| 311 | * @param array $children_elements List of elements to continue traversing (passed by reference). |
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| 312 | * @param int $max_depth Max depth to traverse. |
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| 313 | * @param int $depth Depth of current element. |
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| 314 | * @param array $args An array of arguments. |
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| 315 | * @param string $output Used to append additional content (passed by reference). |
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| 316 | */ |
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| 317 | public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) { |
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| 318 | if ( ! $element ) { |
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| 319 | return; } |
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| 320 | $id_field = $this->db_fields['id']; |
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| 321 | // Display this element. |
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| 322 | if ( is_object( $args[0] ) ) { |
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| 323 | $args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] ); } |
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| 324 | parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output ); |
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| 325 | } |
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| 326 | |||
| 327 | /** |
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| 328 | * Menu Fallback |
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| 329 | * ============= |
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| 330 | * If this function is assigned to the wp_nav_menu's fallback_cb variable |
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| 331 | * and a menu has not been assigned to the theme location in the WordPress |
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| 332 | * menu manager the function with display nothing to a non-logged in user, |
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| 333 | * and will add a link to the WordPress menu manager if logged in as an admin. |
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| 334 | * |
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| 335 | * @param array $args passed from the wp_nav_menu function. |
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| 336 | */ |
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| 337 | public static function fallback( $args ) { |
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| 338 | if ( current_user_can( 'edit_theme_options' ) ) { |
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| 339 | |||
| 340 | /* Get Arguments. */ |
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| 341 | $container = $args['container']; |
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| 342 | $container_id = $args['container_id']; |
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| 343 | $container_class = $args['container_class']; |
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| 344 | $menu_class = $args['menu_class']; |
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| 345 | $menu_id = $args['menu_id']; |
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| 346 | |||
| 347 | // initialize var to store fallback html. |
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| 348 | $fallback_output = ''; |
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| 349 | |||
| 350 | if ( $container ) { |
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| 351 | $fallback_output .= '<' . esc_attr( $container ); |
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| 352 | if ( $container_id ) { |
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| 353 | $fallback_output .= ' id="' . esc_attr( $container_id ) . '"'; |
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| 354 | } |
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| 355 | if ( $container_class ) { |
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| 356 | $fallback_output .= ' class="' . esc_attr( $container_class ) . '"'; |
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| 357 | } |
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| 358 | $fallback_output .= '>'; |
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| 359 | } |
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| 360 | $fallback_output .= '<ul'; |
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| 361 | if ( $menu_id ) { |
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| 362 | $fallback_output .= ' id="' . esc_attr( $menu_id ) . '"'; } |
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| 363 | if ( $menu_class ) { |
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| 364 | $fallback_output .= ' class="' . esc_attr( $menu_class ) . '"'; } |
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| 365 | $fallback_output .= '>'; |
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| 366 | $fallback_output .= '<li><a href="' . esc_url( admin_url( 'nav-menus.php' ) ) . '" title="' . esc_attr__( 'Add a menu', 'wp-bootstrap-navwalker' ) . '">' . esc_html__( 'Add a menu', 'wp-bootstrap-navwalker' ) . '</a></li>'; |
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| 367 | $fallback_output .= '</ul>'; |
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| 368 | if ( $container ) { |
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| 369 | $fallback_output .= '</' . esc_attr( $container ) . '>'; |
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| 370 | } |
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| 371 | |||
| 372 | // if $args has 'echo' key and it's true echo, otherwise return. |
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| 373 | if ( array_key_exists( 'echo', $args ) && $args['echo'] ) { |
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| 374 | echo $fallback_output; // WPCS: XSS OK. |
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| 375 | } else { |
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| 376 | return $fallback_output; |
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| 377 | } |
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| 378 | } |
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| 379 | } |
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| 380 | |||
| 381 | /** |
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| 382 | * Find any custom linkmod or icon classes and store in their holder |
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| 383 | * arrays then remove them from the main classes array. |
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| 384 | * |
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| 385 | * Supported linkmods: .disabled, .dropdown-header, .dropdown-divider, .sr-only |
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| 386 | * Supported iconsets: Font Awesome 4/5, Glypicons |
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| 387 | * |
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| 388 | * NOTE: This accepts the linkmod and icon arrays by reference. |
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| 389 | * |
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| 390 | * @since 4.0.0 |
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| 391 | * |
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| 392 | * @param array $classes an array of classes currently assigned to the item. |
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| 393 | * @param array $linkmod_classes an array to hold linkmod classes. |
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| 394 | * @param array $icon_classes an array to hold icon classes. |
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| 395 | * @param integer $depth an integer holding current depth level. |
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| 396 | * |
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| 397 | * @return array $classes a maybe modified array of classnames. |
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| 398 | */ |
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| 399 | private function seporate_linkmods_and_icons_from_classes( $classes, &$linkmod_classes, &$icon_classes, $depth ) { |
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| 400 | // Loop through $classes array to find linkmod or icon classes. |
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| 401 | foreach ( $classes as $key => $class ) { |
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| 402 | // If any special classes are found, store the class in it's |
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| 403 | // holder array and and unset the item from $classes. |
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| 404 | if ( preg_match( '/^disabled|^sr-only/i', $class ) ) { |
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| 405 | // Test for .disabled or .sr-only classes. |
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| 406 | $linkmod_classes[] = $class; |
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| 407 | unset( $classes[ $key ] ); |
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| 408 | } elseif ( preg_match( '/^dropdown-header|^dropdown-divider|^dropdown-item-text/i', $class ) && $depth > 0 ) { |
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| 409 | // Test for .dropdown-header or .dropdown-divider and a |
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| 410 | // depth greater than 0 - IE inside a dropdown. |
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| 411 | $linkmod_classes[] = $class; |
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| 412 | unset( $classes[ $key ] ); |
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| 413 | } elseif ( preg_match( '/^fa-(\S*)?|^fa(s|r|l|b)?(\s?)?$/i', $class ) ) { |
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| 414 | // Font Awesome. |
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| 415 | $icon_classes[] = $class; |
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| 416 | unset( $classes[ $key ] ); |
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| 417 | } elseif ( preg_match( '/^glyphicon-(\S*)?|^glyphicon(\s?)$/i', $class ) ) { |
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| 418 | // Glyphicons. |
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| 419 | $icon_classes[] = $class; |
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| 420 | unset( $classes[ $key ] ); |
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| 421 | } |
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| 422 | } |
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| 423 | |||
| 424 | return $classes; |
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| 425 | } |
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| 426 | |||
| 427 | /** |
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| 428 | * Return a string containing a linkmod type and update $atts array |
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| 429 | * accordingly depending on the decided. |
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| 430 | * |
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| 431 | * @since 4.0.0 |
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| 432 | * |
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| 433 | * @param array $linkmod_classes array of any link modifier classes. |
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| 434 | * |
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| 435 | * @return string empty for default, a linkmod type string otherwise. |
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| 436 | */ |
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| 437 | private function get_linkmod_type( $linkmod_classes = array() ) { |
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| 438 | $linkmod_type = ''; |
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| 439 | // Loop through array of linkmod classes to handle their $atts. |
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| 440 | if ( ! empty( $linkmod_classes ) ) { |
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| 441 | foreach ( $linkmod_classes as $link_class ) { |
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| 442 | if ( ! empty( $link_class ) ) { |
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| 443 | |||
| 444 | // check for special class types and set a flag for them. |
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| 445 | if ( 'dropdown-header' === $link_class ) { |
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| 446 | $linkmod_type = 'dropdown-header'; |
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| 447 | } elseif ( 'dropdown-divider' === $link_class ) { |
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| 448 | $linkmod_type = 'dropdown-divider'; |
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| 449 | } elseif ( 'dropdown-item-text' === $link_class ) { |
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| 450 | $linkmod_type = 'dropdown-item-text'; |
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| 451 | } |
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| 452 | } |
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| 453 | } |
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| 454 | } |
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| 455 | return $linkmod_type; |
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| 456 | } |
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| 457 | |||
| 458 | /** |
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| 459 | * Update the attributes of a nav item depending on the limkmod classes. |
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| 460 | * |
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| 461 | * @since 4.0.0 |
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| 462 | * |
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| 463 | * @param array $atts array of atts for the current link in nav item. |
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| 464 | * @param array $linkmod_classes an array of classes that modify link or nav item behaviors or displays. |
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| 465 | * |
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| 466 | * @return array maybe updated array of attributes for item. |
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| 467 | */ |
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| 468 | private function update_atts_for_linkmod_type( $atts = array(), $linkmod_classes = array() ) { |
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| 469 | if ( ! empty( $linkmod_classes ) ) { |
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| 470 | foreach ( $linkmod_classes as $link_class ) { |
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| 471 | if ( ! empty( $link_class ) ) { |
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| 472 | // update $atts with a space and the extra classname... |
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| 473 | // so long as it's not a sr-only class. |
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| 474 | if ( 'sr-only' !== $link_class ) { |
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| 475 | $atts['class'] .= ' ' . esc_attr( $link_class ); |
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| 476 | } |
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| 477 | // check for special class types we need additional handling for. |
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| 478 | if ( 'disabled' === $link_class ) { |
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| 479 | // Convert link to '#' and unset open targets. |
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| 480 | $atts['href'] = '#'; |
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| 481 | unset( $atts['target'] ); |
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| 482 | } elseif ( 'dropdown-header' === $link_class || 'dropdown-divider' === $link_class || 'dropdown-item-text' === $link_class ) { |
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| 483 | // Store a type flag and unset href and target. |
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| 484 | unset( $atts['href'] ); |
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| 485 | unset( $atts['target'] ); |
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| 486 | } |
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| 487 | } |
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| 488 | } |
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| 489 | } |
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| 490 | return $atts; |
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| 491 | } |
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| 492 | |||
| 493 | /** |
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| 494 | * Wraps the passed text in a screen reader only class. |
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| 495 | * |
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| 496 | * @since 4.0.0 |
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| 497 | * |
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| 498 | * @param string $text the string of text to be wrapped in a screen reader class. |
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| 499 | * @return string the string wrapped in a span with the class. |
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| 500 | */ |
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| 501 | private function wrap_for_screen_reader( $text = '' ) { |
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| 507 | |||
| 508 | /** |
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| 509 | * Returns the correct opening element and attributes for a linkmod. |
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| 510 | * |
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| 511 | * @since 4.0.0 |
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| 512 | * |
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| 513 | * @param string $linkmod_type a sting containing a linkmod type flag. |
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| 514 | * @param string $attributes a string of attributes to add to the element. |
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| 515 | * |
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| 516 | * @return string a string with the openign tag for the element with attribibutes added. |
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| 517 | */ |
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| 518 | private function linkmod_element_open( $linkmod_type, $attributes = '' ) { |
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| 532 | |||
| 533 | /** |
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| 534 | * Return the correct closing tag for the linkmod element. |
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| 535 | * |
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| 536 | * @since 4.0.0 |
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| 537 | * |
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| 538 | * @param string $linkmod_type a string containing a special linkmod type. |
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| 539 | * |
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| 540 | * @return string a string with the closing tag for this linkmod type. |
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| 541 | */ |
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| 542 | private function linkmod_element_close( $linkmod_type ) { |
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| 554 | } |
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| 555 | } |
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| 556 |
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.