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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::attr::Attr;
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::HTMLMetaElementBinding;
use dom::bindings::codegen::Bindings::HTMLMetaElementBinding::HTMLMetaElementMethods;
use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
use dom::bindings::inheritance::Castable;
use dom::bindings::js::{MutNullableJS, Root, RootedReference};
use dom::bindings::str::DOMString;
use dom::cssstylesheet::CSSStyleSheet;
use dom::document::Document;
use dom::element::{AttributeMutation, Element};
use dom::htmlelement::HTMLElement;
use dom::htmlheadelement::HTMLHeadElement;
use dom::node::{Node, UnbindContext, document_from_node, window_from_node};
use dom::virtualmethods::VirtualMethods;
use html5ever_atoms::LocalName;
use parking_lot::RwLock;
use servo_config::prefs::PREFS;
use std::ascii::AsciiExt;
use std::sync::Arc;
use std::sync::atomic::AtomicBool;
use style::attr::AttrValue;
use style::str::HTML_SPACE_CHARACTERS;
use style::stylesheets::{Stylesheet, CssRule, CssRules, Origin};
use style::viewport::ViewportRule;
#[dom_struct]
pub struct HTMLMetaElement {
htmlelement: HTMLElement,
#[ignore_heap_size_of = "Arc"]
stylesheet: DOMRefCell<Option<Arc<Stylesheet>>>,
cssom_stylesheet: MutNullableJS<CSSStyleSheet>,
}
impl HTMLMetaElement {
fn new_inherited(local_name: LocalName,
prefix: Option<DOMString>,
document: &Document) -> HTMLMetaElement {
HTMLMetaElement {
htmlelement: HTMLElement::new_inherited(local_name, prefix, document),
stylesheet: DOMRefCell::new(None),
cssom_stylesheet: MutNullableJS::new(None),
}
}
#[allow(unrooted_must_root)]
pub fn new(local_name: LocalName,
prefix: Option<DOMString>,
document: &Document) -> Root<HTMLMetaElement> {
Node::reflect_node(box HTMLMetaElement::new_inherited(local_name, prefix, document),
document,
HTMLMetaElementBinding::Wrap)
}
pub fn get_stylesheet(&self) -> Option<Arc<Stylesheet>> {
self.stylesheet.borrow().clone()
}
pub fn get_cssom_stylesheet(&self) -> Option<Root<CSSStyleSheet>> {
self.get_stylesheet().map(|sheet| {
self.cssom_stylesheet.or_init(|| {
CSSStyleSheet::new(&window_from_node(self),
self.upcast::<Element>(),
"text/css".into(),
None, // todo handle location
None, // todo handle title
sheet)
})
})
}
fn process_attributes(&self) {
let element = self.upcast::<Element>();
if let Some(name) = element.get_attribute(&ns!(), &local_name!("name")).r() {
let name = name.value().to_ascii_lowercase();
let name = name.trim_matches(HTML_SPACE_CHARACTERS);
if name == "viewport" {
self.apply_viewport();
}
if name == "referrer" {
self.apply_referrer();
}
}
}
fn apply_viewport(&self) {
if !PREFS.get("layout.viewport.enabled").as_boolean().unwrap_or(false) {
return;
}
let element = self.upcast::<Element>();
if let Some(content) = element.get_attribute(&ns!(), &local_name!("content")).r() {
let content = content.value();
if !content.is_empty() {
if let Some(translated_rule) = ViewportRule::from_meta(&**content) {
*self.stylesheet.borrow_mut() = Some(Arc::new(Stylesheet {
rules: CssRules::new(vec![CssRule::Viewport(Arc::new(RwLock::new(translated_rule)))]),
origin: Origin::Author,
base_url: window_from_node(self).get_url(),
namespaces: Default::default(),
media: Default::default(),
// Viewport constraints are always recomputed on resize; they don't need to
// force all styles to be recomputed.
dirty_on_viewport_size_change: AtomicBool::new(false),
disabled: AtomicBool::new(false),
}));
let doc = document_from_node(self);
doc.invalidate_stylesheets();
}
}
}
}
fn process_referrer_attribute(&self) {
let element = self.upcast::<Element>();
if let Some(name) = element.get_attribute(&ns!(), &local_name!("name")).r() {
let name = name.value().to_ascii_lowercase();
let name = name.trim_matches(HTML_SPACE_CHARACTERS);
if name == "referrer" {
self.apply_referrer();
}
}
}
/// https://html.spec.whatwg.org/multipage/#meta-referrer
fn apply_referrer(&self) {
if let Some(parent) = self.upcast::<Node>().GetParentElement() {
if let Some(head) = parent.downcast::<HTMLHeadElement>() {
head.set_document_referrer();
}
}
}
}
impl HTMLMetaElementMethods for HTMLMetaElement {
// https://html.spec.whatwg.org/multipage/#dom-meta-name
make_getter!(Name, "name");
// https://html.spec.whatwg.org/multipage/#dom-meta-name
make_atomic_setter!(SetName, "name");
// https://html.spec.whatwg.org/multipage/#dom-meta-content
make_getter!(Content, "content");
// https://html.spec.whatwg.org/multipage/#dom-meta-content
make_setter!(SetContent, "content");
}
impl VirtualMethods for HTMLMetaElement {
fn super_type(&self) -> Option<&VirtualMethods> {
Some(self.upcast::<HTMLElement>() as &VirtualMethods)
}
fn bind_to_tree(&self, tree_in_doc: bool) {
if let Some(ref s) = self.super_type() {
s.bind_to_tree(tree_in_doc);
}
if tree_in_doc {
self.process_attributes();
}
}
fn parse_plain_attribute(&self, name: &LocalName, value: DOMString) -> AttrValue {
match name {
&local_name!("name") => AttrValue::from_atomic(value.into()),
_ => self.super_type().unwrap().parse_plain_attribute(name, value),
}
}
fn attribute_mutated(&self, attr: &Attr, mutation: AttributeMutation) {
if let Some(s) = self.super_type() {
s.attribute_mutated(attr, mutation);
}
self.process_referrer_attribute();
}
fn unbind_from_tree(&self, context: &UnbindContext) {
if let Some(ref s) = self.super_type() {
s.unbind_from_tree(context);
}
if context.tree_in_doc {
self.process_referrer_attribute();
}
}
}
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