s_node( WP_HTML_Token $token ): bool { foreach ( $this->walk_up() as $item ) { if ( $token === $item ) { return true; } } return false; } /** * Returns how many nodes are currently in the stack of open elements. * * @since 6.4.0 * * @return int How many node are in the stack of open elements. */ public function count(): int { return count( $this->stack ); } /** * Returns the node at the end of the stack of open elements, * if one exists. If the stack is empty, returns null. * * @since 6.4.0 * * @return WP_HTML_Token|null Last node in the stack of open elements, if one exists, otherwise null. */ public function current_node(): ?WP_HTML_Token { $current_node = end( $this->stack ); return $current_node ? $current_node : null; } /** * Indicates if the current node is of a given type or name. * * It's possible to pass either a node type or a node name to this function. * In the case there is no current element it will always return `false`. * * Example: * * // Is the current node a text node? * $stack->current_node_is( '#text' ); * * // Is the current node a DIV element? * $stack->current_node_is( 'DIV' ); * * // Is the current node any element/tag? * $stack->current_node_is( '#tag' ); * * @see WP_HTML_Tag_Processor::get_token_type * @see WP_HTML_Tag_Processor::get_token_name * * @since 6.7.0 * * @access private * * @param string $identity Check if the current node has this name or type (depending on what is provided). * @return bool Whether there is a current element that matches the given identity, whether a token name or type. */ public function current_node_is( string $identity ): bool { $current_node = end( $this->stack ); if ( false === $current_node ) { return false; } $current_node_name = $current_node->node_name; return ( $current_node_name === $identity || ( '#doctype' === $identity && 'html' === $current_node_name ) || ( '#tag' === $identity && ctype_upper( $current_node_name ) ) ); } /** * Returns whether an element is in a specific scope. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#has-an-element-in-the-specific-scope * * @param string $tag_name Name of tag check. * @param string[] $termination_list List of elements that terminate the search. * @return bool Whether the element was found in a specific scope. */ public function has_element_in_specific_scope( string $tag_name, $termination_list ): bool { foreach ( $this->walk_up() as $node ) { $namespaced_name = 'html' === $node->namespace ? $node->node_name : "{$node->namespace} {$node->node_name}"; if ( $namespaced_name === $tag_name ) { return true; } if ( '(internal: H1 through H6 - do not use)' === $tag_name && in_array( $namespaced_name, array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' ), true ) ) { return true; } if ( in_array( $namespaced_name, $termination_list, true ) ) { return false; } } return false; } /** * Returns whether a particular element is in scope. * * > The stack of open elements is said to have a particular element in * > scope when it has that element in the specific scope consisting of * > the following element types: * > * > - applet * > - caption * > - html * > - table * > - td * > - th * > - marquee * > - object * > - template * > - MathML mi * > - MathML mo * > - MathML mn * > - MathML ms * > - MathML mtext * > - MathML annotation-xml * > - SVG foreignObject * > - SVG desc * > - SVG title * * @since 6.4.0 * @since 6.7.0 Full support. * * @see https://html.spec.whatwg.org/#has-an-element-in-scope * * @param string $tag_name Name of tag to check. * @return bool Whether given element is in scope. */ public function has_element_in_scope( string $tag_name ): bool { return $this->has_element_in_specific_scope( $tag_name, array( 'APPLET', 'CAPTION', 'HTML', 'TABLE', 'TD', 'TH', 'MARQUEE', 'OBJECT', 'TEMPLATE', 'math MI', 'math MO', 'math MN', 'math MS', 'math MTEXT', 'math ANNOTATION-XML', 'svg FOREIGNOBJECT', 'svg DESC', 'svg TITLE', ) ); } /** * Returns whether a particular element is in list item scope. * * > The stack of open elements is said to have a particular element * > in list item scope when it has that element in the specific scope * > consisting of the following element types: * > * > - All the element types listed above for the has an element in scope algorithm. * > - ol in the HTML namespace * > - ul in the HTML namespace * * @since 6.4.0 * @since 6.5.0 Implemented: no longer throws on every invocation. * @since 6.7.0 Supports all required HTML elements. * * @see https://html.spec.whatwg.org/#has-an-element-in-list-item-scope * * @param string $tag_name Name of tag to check. * @return bool Whether given element is in scope. */ public function has_element_in_list_item_scope( string $tag_name ): bool { return $this->has_element_in_specific_scope( $tag_name, array( 'APPLET', 'BUTTON', 'CAPTION', 'HTML', 'TABLE', 'TD', 'TH', 'MARQUEE', 'OBJECT', 'OL', 'TEMPLATE', 'UL', 'math MI', 'math MO', 'math MN', 'math MS', 'math MTEXT', 'math ANNOTATION-XML', 'svg FOREIGNOBJECT', 'svg DESC', 'svg TITLE', ) ); } /** * Returns whether a particular element is in button scope. * * > The stack of open elements is said to have a particular element * > in button scope when it has that element in the specific scope * > consisting of the following element types: * > * > - All the element types listed above for the has an element in scope algorithm. * > - button in the HTML namespace * * @since 6.4.0 * @since 6.7.0 Supports all required HTML elements. * * @see https://html.spec.whatwg.org/#has-an-element-in-button-scope * * @param string $tag_name Name of tag to check. * @return bool Whether given element is in scope. */ public function has_element_in_button_scope( string $tag_name ): bool { return $this->has_element_in_specific_scope( $tag_name, array( 'APPLET', 'BUTTON', 'CAPTION', 'HTML', 'TABLE', 'TD', 'TH', 'MARQUEE', 'OBJECT', 'TEMPLATE', 'math MI', 'math MO', 'math MN', 'math MS', 'math MTEXT', 'math ANNOTATION-XML', 'svg FOREIGNOBJECT', 'svg DESC', 'svg TITLE', ) ); } /** * Returns whether a particular element is in table scope. * * > The stack of open elements is said to have a particular element * > in table scope when it has that element in the specific scope * > consisting of the following element types: * > * > - html in the HTML namespace * > - table in the HTML namespace * > - template in the HTML namespace * * @since 6.4.0 * @since 6.7.0 Full implementation. * * @see https://html.spec.whatwg.org/#has-an-element-in-table-scope * * @param string $tag_name Name of tag to check. * @return bool Whether given element is in scope. */ public function has_element_in_table_scope( string $tag_name ): bool { return $this->has_element_in_specific_scope( $tag_name, array( 'HTML', 'TABLE', 'TEMPLATE', ) ); } /** * Returns whether a particular element is in select scope. * * This test differs from the others like it, in that its rules are inverted. * Instead of arriving at a match when one of any tag in a termination group * is reached, this one terminates if any other tag is reached. * * > The stack of open elements is said to have a particular element in select scope when it has * > that element in the specific scope consisting of all element types except the following: * > - optgroup in the HTML namespace * > - option in the HTML namespace * * @since 6.4.0 Stub implementation (throws). * @since 6.7.0 Full implementation. * * @see https://html.spec.whatwg.org/#has-an-element-in-select-scope * * @param string $tag_name Name of tag to check. * @return bool Whether the given element is in SELECT scope. */ public function has_element_in_select_scope( string $tag_name ): bool { foreach ( $this->walk_up() as $node ) { if ( $node->node_name === $tag_name ) { return true; } if ( 'OPTION' !== $node->node_name && 'OPTGROUP' !== $node->node_name ) { return false; } } return false; } /** * Returns whether a P is in BUTTON scope. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#has-an-element-in-button-scope * * @return bool Whether a P is in BUTTON scope. */ public function has_p_in_button_scope(): bool { return $this->has_p_in_button_scope; } /** * Pops a node off of the stack of open elements. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#stack-of-open-elements * * @return bool Whether a node was popped off of the stack. */ public function pop(): bool { $item = array_pop( $this->stack ); if ( null === $item ) { return false; } $this->after_element_pop( $item ); return true; } /** * Pops nodes off of the stack of open elements until an HTML tag with the given name has been popped. * * @since 6.4.0 * * @see WP_HTML_Open_Elements::pop * * @param string $html_tag_name Name of tag that needs to be popped off of the stack of open elements. * @return bool Whether a tag of the given name was found and popped off of the stack of open elements. */ public function pop_until( string $html_tag_name ): bool { foreach ( $this->walk_up() as $item ) { $this->pop(); if ( 'html' !== $item->namespace ) { continue; } if ( '(internal: H1 through H6 - do not use)' === $html_tag_name && in_array( $item->node_name, array( 'H1', 'H2', 'H3', 'H4', 'H5', 'H6' ), true ) ) { return true; } if ( $html_tag_name === $item->node_name ) { return true; } } return false; } /** * Pushes a node onto the stack of open elements. * * @since 6.4.0 * * @see https://html.spec.whatwg.org/#stack-of-open-elements * * @param WP_HTML_Token $stack_item Item to add onto stack. */ public function push( WP_HTML_Token $stack_item ): void { $this->stack[] = $stack_item; $this->after_element_push( $stack_item ); } /** * Removes a specific node from the stack of open elements. * * @since 6.4.0 * * @param WP_HTML_Token $token The node to remove from the stack of open elements. * @return bool Whether the node was found and removed from the stack of open elements. */ public function remove_node( WP_HTML_Token $token ): bool { foreach ( $this->walk_up() as $position_from_end => $item ) { if ( $token->bookmark_name !== $item->bookmark_name ) { continue; } $position_from_start = $this->count() - $position_from_end - 1; array_splice( $this->stack, $position_from_start, 1 ); $this->after_element_pop( $item ); return true; } return false; } /** * Steps through the stack of open elements, starting with the top element * (added first) and walking downwards to the one added last. * * This generator function is designed to be used inside a "foreach" loop. * * Example: * * $html = 'We are here'; * foreach ( $stack->walk_down() as $node ) { * echo "{$node->node_name} -> "; * } * > EM -> STRONG -> A -> * * To start with the most-recently added element and walk towards the top, * see WP_HTML_Open_Elements::walk_up(). * * @since 6.4.0 */ public function walk_down() { $count = count( $this->stack ); for ( $i = 0; $i < $count; $i++ ) { yield $this->stack[ $i ]; } } /** * Steps through the stack of open elements, starting with the bottom element * (added last) and walking upwards to the one added first. * * This generator function is designed to be used inside a "foreach" loop. * * Example: * * $html = 'We are here'; * foreach ( $stack->walk_up() as $node ) { * echo "{$node->node_name} -> "; * } * > A -> STRONG -> EM -> * * To start with the first added element and walk towards the bottom, * see WP_HTML_Open_Elements::walk_down(). * * @since 6.4.0 * @since 6.5.0 Accepts $above_this_node to start traversal above a given node, if it exists. * * @param WP_HTML_Token|null $above_this_node Optional. Start traversing above this node, * if provided and if the node exists. */ public function walk_up( ?WP_HTML_Token $above_this_node = null ) { $has_found_node = null === $above_this_node; for ( $i = count( $this->stack ) - 1; $i >= 0; $i-- ) { $node = $this->stack[ $i ]; if ( ! $has_found_node ) { $has_found_node = $node === $above_this_node; continue; } yield $node; } } /* * Internal helpers. */ /** * Updates internal flags after adding an element. * * Certain conditions (such as "has_p_in_button_scope") are maintained here as * flags that are only modified when adding and removing elements. This allows * the HTML Processor to quickly check for these conditions instead of iterating * over the open stack elements upon each new tag it encounters. These flags, * however, need to be maintained as items are added and removed from the stack. * * @since 6.4.0 * * @param WP_HTML_Token $item Element that was added to the stack of open elements. */ public function after_element_push( WP_HTML_Token $item ): void { $namespaced_name = 'html' === $item->namespace ? $item->node_name : "{$item->namespace} {$item->node_name}"; /* * When adding support for new elements, expand this switch to trap * cases where the precalculated value needs to change. */ switch ( $namespaced_name ) { case 'APPLET': case 'BUTTON': case 'CAPTION': case 'HTML': case 'TABLE': case 'TD': case 'TH': case 'MARQUEE': case 'OBJECT': case 'TEMPLATE': case 'math MI': case 'math MO': case 'math MN': case 'math MS': case 'math MTEXT': case 'math ANNOTATION-XML': case 'svg FOREIGNOBJECT': case 'svg DESC': case 'svg TITLE': $this->has_p_in_button_scope = false; break; case 'P': $this->has_p_in_button_scope = true; break; } if ( null !== $this->push_handler ) { ( $this->push_handler )( $item ); } } /** * Updates internal flags after removing an element. * * Certain conditions (such as "has_p_in_button_scope") are maintained here as * flags that are only modified when adding and removing elements. This allows * the HTML Processor to quickly check for these conditions instead of iterating * over the open stack elements upon each new tag it encounters. These flags, * however, need to be maintained as items are added and removed from the stack. * * @since 6.4.0 * * @param WP_HTML_Token $item Element that was removed from the stack of open elements. */ public function after_element_pop( WP_HTML_Token $item ): void { /* * When adding support for new elements, expand this switch to trap * cases where the precalculated value needs to change. */ switch ( $item->node_name ) { case 'APPLET': case 'BUTTON': case 'CAPTION': case 'HTML': case 'P': case 'TABLE': case 'TD': case 'TH': case 'MARQUEE': case 'OBJECT': case 'TEMPLATE': case 'math MI': case 'math MO': case 'math MN': case 'math MS': case 'math MTEXT': case 'math ANNOTATION-XML': case 'svg FOREIGNOBJECT': case 'svg DESC': case 'svg TITLE': $this->has_p_in_button_scope = $this->has_element_in_button_scope( 'P' ); break; } if ( null !== $this->pop_handler ) { ( $this->pop_handler )( $item ); } } /** * Clear the stack back to a table context. * * > When the steps above require the UA to clear the stack back to a table context, it means * > that the UA must, while the current node is not a table, template, or html element, pop * > elements from the stack of open elements. * * @see https://html.spec.whatwg.org/multipage/parsing.html#clear-the-stack-back-to-a-table-context * * @since 6.7.0 */ public function clear_to_table_context(): void { foreach ( $this->walk_up() as $item ) { if ( 'TABLE' === $item->node_name || 'TEMPLATE' === $item->node_name || 'HTML' === $item->node_name ) { break; } $this->pop(); } } /** * Clear the stack back to a table body context. * * > When the steps above require the UA to clear the stack back to a table body context, it * > means that the UA must, while the current node is not a tbody, tfoot, thead, template, or * > html element, pop elements from the stack of open elements. * * @see https://html.spec.whatwg.org/multipage/parsing.html#clear-the-stack-back-to-a-table-body-context * * @since 6.7.0 */ public function clear_to_table_body_context(): void { foreach ( $this->walk_up() as $item ) { if ( 'TBODY' === $item->node_name || 'TFOOT' === $item->node_name || 'THEAD' === $item->node_name || 'TEMPLATE' === $item->node_name || 'HTML' === $item->node_name ) { break; } $this->pop(); } } /** * Clear the stack back to a table row context. * * > When the steps above require the UA to clear the stack back to a table row context, it * > means that the UA must, while the current node is not a tr, template, or html element, pop * > elements from the stack of open elements. * * @see https://html.spec.whatwg.org/multipage/parsing.html#clear-the-stack-back-to-a-table-row-context * * @since 6.7.0 */ public function clear_to_table_row_context(): void { foreach ( $this->walk_up() as $item ) { if ( 'TR' === $item->node_name || 'TEMPLATE' === $item->node_name || 'HTML' === $item->node_name ) { break; } $this->pop(); } } /** * Wakeup magic method. * * @since 6.6.0 */ public function __wakeup() { throw new \LogicException( __CLASS__ . ' should never be unserialized' ); } } on success, or error object on failure. */ public function update_item( $request ) { $options = $this->get_registered_options(); $params = $request->get_params(); foreach ( $options as $name => $args ) { if ( ! array_key_exists( $name, $params ) ) { continue; } /** * Filters whether to preempt a setting value update via the REST API. * * Allows hijacking the setting update logic and overriding the built-in behavior by * returning true. * * @since 4.7.0 * * @param bool $result Whether to override the default behavior for updating the * value of a setting. * @param string $name Setting name (as shown in REST API responses). * @param mixed $value Updated setting value. * @param array $args Arguments passed to register_setting() for this setting. */ $updated = apply_filters( 'rest_pre_update_setting', false, $name, $request[ $name ], $args ); if ( $updated ) { continue; } /* * A null value for an option would have the same effect as * deleting the option from the database, and relying on the * default value. */ if ( is_null( $request[ $name ] ) ) { /* * A null value is returned in the response for any option * that has a non-scalar value. * * To protect clients from accidentally including the null * values from a response object in a request, we do not allow * options with values that don't pass validation to be updated to null. * Without this added protection a client could mistakenly * delete all options that have invalid values from the * database. */ if ( is_wp_error( rest_validate_value_from_schema( get_option( $args['option_name'], false ), $args['schema'] ) ) ) { return new WP_Error( 'rest_invalid_stored_value', /* translators: %s: Property name. */ sprintf( __( 'The %s property has an invalid stored value, and cannot be updated to null.' ), $name ), array( 'status' => 500 ) ); } delete_option( $args['option_name'] ); } else { update_option( $args['option_name'], $request[ $name ] ); } } return $this->get_item( $request ); } /** * Retrieves all of the registered options for the Settings API. * * @since 4.7.0 * * @return array Array of registered options. */ protected function get_registered_options() { $rest_options = array(); foreach ( get_registered_settings() as $name => $args ) { if ( empty( $args['show_in_rest'] ) ) { continue; } $rest_args = array(); if ( is_array( $args['show_in_rest'] ) ) { $rest_args = $args['show_in_rest']; } $defaults = array( 'name' => ! empty( $rest_args['name'] ) ? $rest_args['name'] : $name, 'schema' => array(), ); $rest_args = array_merge( $defaults, $rest_args ); $default_schema = array( 'type' => empty( $args['type'] ) ? null : $args['type'], 'title' => empty( $args['label'] ) ? '' : $args['label'], 'description' => empty( $args['description'] ) ? '' : $args['description'], 'default' => isset( $args['default'] ) ? $args['default'] : null, ); $rest_args['schema'] = array_merge( $default_schema, $rest_args['schema'] ); $rest_args['option_name'] = $name; // Skip over settings that don't have a defined type in the schema. if ( empty( $rest_args['schema']['type'] ) ) { continue; } /* * Allow the supported types for settings, as we don't want invalid types * to be updated with arbitrary values that we can't do decent sanitizing for. */ if ( ! in_array( $rest_args['schema']['type'], array( 'number', 'integer', 'string', 'boolean', 'array', 'object' ), true ) ) { continue; } $rest_args['schema'] = rest_default_additional_properties_to_false( $rest_args['schema'] ); $rest_options[ $rest_args['name'] ] = $rest_args; } return $rest_options; } /** * Retrieves the site setting schema, conforming to JSON Schema. * * @since 4.7.0 * * @return array Item schema data. */ public function get_item_schema() { if ( $this->schema ) { return $this->add_additional_fields_schema( $this->schema ); } $options = $this->get_registered_options(); $schema = array( '$schema' => 'http://json-schema.org/draft-04/schema#', 'title' => 'settings', 'type' => 'object', 'properties' => array(), ); foreach ( $options as $option_name => $option ) { $schema['properties'][ $option_name ] = $option['schema']; $schema['properties'][ $option_name ]['arg_options'] = array( 'sanitize_callback' => array( $this, 'sanitize_callback' ), ); } $this->schema = $schema; return $this->add_additional_fields_schema( $this->schema ); } /** * Custom sanitize callback used for all options to allow the use of 'null'. * * By default, the schema of settings will throw an error if a value is set to * `null` as it's not a valid value for something like "type => string". We * provide a wrapper sanitizer to allow the use of `null`. * * @since 4.7.0 * * @param mixed $value The value for the setting. * @param WP_REST_Request $request The request object. * @param string $param The parameter name. * @return mixed|WP_Error */ public function sanitize_callback( $value, $request, $param ) { if ( is_null( $value ) ) { return $value; } return rest_parse_request_arg( $value, $request, $param ); } /** * Recursively add additionalProperties = false to all objects in a schema * if no additionalProperties setting is specified. * * This is needed to restrict properties of objects in settings values to only * registered items, as the REST API will allow additional properties by * default. * * @since 4.9.0 * @deprecated 6.1.0 Use {@see rest_default_additional_properties_to_false()} instead. * * @param array $schema The schema array. * @return array */ protected function set_additional_properties_to_false( $schema ) { _deprecated_function( __METHOD__, '6.1.0', 'rest_default_additional_properties_to_false()' ); return rest_default_additional_properties_to_false( $schema ); } }
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