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element.rs
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element.rs
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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 https://mozilla.org/MPL/2.0/. */
//! Element nodes.
use std::borrow::Cow;
use std::cell::Cell;
use std::default::Default;
use std::ops::Deref;
use std::rc::Rc;
use std::str::FromStr;
use std::{fmt, mem};
use cssparser::match_ignore_ascii_case;
use devtools_traits::AttrInfo;
use dom_struct::dom_struct;
use euclid::default::{Rect, Size2D};
use html5ever::serialize::TraversalScope::{ChildrenOnly, IncludeNode};
use html5ever::serialize::{SerializeOpts, TraversalScope};
use html5ever::{
local_name, namespace_prefix, namespace_url, ns, serialize, LocalName, Namespace, Prefix,
QualName,
};
use js::jsapi::Heap;
use js::jsval::JSVal;
use js::rust::HandleObject;
use msg::constellation_msg::InputMethodType;
use net_traits::request::CorsSettings;
use net_traits::ReferrerPolicy;
use script_layout_interface::ReflowGoal;
use selectors::attr::{AttrSelectorOperation, CaseSensitivity, NamespaceConstraint};
use selectors::bloom::{BloomFilter, BLOOM_HASH_MASK};
use selectors::matching::{ElementSelectorFlags, MatchingContext};
use selectors::sink::Push;
use selectors::Element as SelectorsElement;
use servo_arc::Arc;
use servo_atoms::Atom;
use style::applicable_declarations::ApplicableDeclarationBlock;
use style::attr::{AttrValue, LengthOrPercentageOrAuto};
use style::context::QuirksMode;
use style::invalidation::element::restyle_hints::RestyleHint;
use style::properties::longhands::{
self, background_image, border_spacing, font_family, font_size,
};
use style::properties::{
parse_style_attribute, ComputedValues, Importance, PropertyDeclaration,
PropertyDeclarationBlock,
};
use style::rule_tree::CascadeLevel;
use style::selector_parser::{
extended_filtering, NonTSPseudoClass, PseudoElement, RestyleDamage, SelectorImpl,
SelectorParser,
};
use style::shared_lock::{Locked, SharedRwLock};
use style::stylesheets::layer_rule::LayerOrder;
use style::stylesheets::{CssRuleType, UrlExtraData};
use style::values::generics::NonNegative;
use style::values::{computed, specified, AtomIdent, AtomString, CSSFloat};
use style::{dom_apis, thread_state, CaseSensitivityExt};
use style_traits::dom::ElementState;
use xml5ever::serialize as xmlSerialize;
use xml5ever::serialize::TraversalScope::{
ChildrenOnly as XmlChildrenOnly, IncludeNode as XmlIncludeNode,
};
use xml5ever::serialize::{SerializeOpts as XmlSerializeOpts, TraversalScope as XmlTraversalScope};
use super::htmltablecolelement::{HTMLTableColElement, HTMLTableColElementLayoutHelpers};
use crate::dom::activation::Activatable;
use crate::dom::attr::{Attr, AttrHelpersForLayout};
use crate::dom::bindings::cell::{ref_filter_map, DomRefCell, Ref, RefMut};
use crate::dom::bindings::codegen::Bindings::AttrBinding::AttrMethods;
use crate::dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
use crate::dom::bindings::codegen::Bindings::ElementBinding::ElementMethods;
use crate::dom::bindings::codegen::Bindings::FunctionBinding::Function;
use crate::dom::bindings::codegen::Bindings::HTMLTemplateElementBinding::HTMLTemplateElementMethods;
use crate::dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
use crate::dom::bindings::codegen::Bindings::ShadowRootBinding::ShadowRoot_Binding::ShadowRootMethods;
use crate::dom::bindings::codegen::Bindings::WindowBinding::{
ScrollBehavior, ScrollToOptions, WindowMethods,
};
use crate::dom::bindings::codegen::UnionTypes::NodeOrString;
use crate::dom::bindings::conversions::DerivedFrom;
use crate::dom::bindings::error::{Error, ErrorResult, Fallible};
use crate::dom::bindings::inheritance::{Castable, ElementTypeId, HTMLElementTypeId, NodeTypeId};
use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
use crate::dom::bindings::reflector::DomObject;
use crate::dom::bindings::root::{Dom, DomRoot, LayoutDom, MutNullableDom};
use crate::dom::bindings::str::{DOMString, USVString};
use crate::dom::bindings::xmlname::XMLName::InvalidXMLName;
use crate::dom::bindings::xmlname::{
namespace_from_domstring, validate_and_extract, xml_name_type,
};
use crate::dom::characterdata::CharacterData;
use crate::dom::create::create_element;
use crate::dom::customelementregistry::{
CallbackReaction, CustomElementDefinition, CustomElementReaction, CustomElementState,
};
use crate::dom::document::{
determine_policy_for_token, Document, LayoutDocumentHelpers, ReflowTriggerCondition,
};
use crate::dom::documentfragment::DocumentFragment;
use crate::dom::domrect::DOMRect;
use crate::dom::domtokenlist::DOMTokenList;
use crate::dom::elementinternals::ElementInternals;
use crate::dom::eventtarget::EventTarget;
use crate::dom::htmlanchorelement::HTMLAnchorElement;
use crate::dom::htmlbodyelement::{HTMLBodyElement, HTMLBodyElementLayoutHelpers};
use crate::dom::htmlbuttonelement::HTMLButtonElement;
use crate::dom::htmlcanvaselement::{HTMLCanvasElement, LayoutHTMLCanvasElementHelpers};
use crate::dom::htmlcollection::HTMLCollection;
use crate::dom::htmlelement::HTMLElement;
use crate::dom::htmlfieldsetelement::HTMLFieldSetElement;
use crate::dom::htmlfontelement::{HTMLFontElement, HTMLFontElementLayoutHelpers};
use crate::dom::htmlformelement::FormControlElementHelpers;
use crate::dom::htmlhrelement::{HTMLHRElement, HTMLHRLayoutHelpers};
use crate::dom::htmliframeelement::{HTMLIFrameElement, HTMLIFrameElementLayoutMethods};
use crate::dom::htmlimageelement::{HTMLImageElement, LayoutHTMLImageElementHelpers};
use crate::dom::htmlinputelement::{HTMLInputElement, LayoutHTMLInputElementHelpers};
use crate::dom::htmllabelelement::HTMLLabelElement;
use crate::dom::htmllegendelement::HTMLLegendElement;
use crate::dom::htmllinkelement::HTMLLinkElement;
use crate::dom::htmlobjectelement::HTMLObjectElement;
use crate::dom::htmloptgroupelement::HTMLOptGroupElement;
use crate::dom::htmloutputelement::HTMLOutputElement;
use crate::dom::htmlselectelement::HTMLSelectElement;
use crate::dom::htmlstyleelement::HTMLStyleElement;
use crate::dom::htmltablecellelement::{HTMLTableCellElement, HTMLTableCellElementLayoutHelpers};
use crate::dom::htmltableelement::{HTMLTableElement, HTMLTableElementLayoutHelpers};
use crate::dom::htmltablerowelement::{HTMLTableRowElement, HTMLTableRowElementLayoutHelpers};
use crate::dom::htmltablesectionelement::{
HTMLTableSectionElement, HTMLTableSectionElementLayoutHelpers,
};
use crate::dom::htmltemplateelement::HTMLTemplateElement;
use crate::dom::htmltextareaelement::{HTMLTextAreaElement, LayoutHTMLTextAreaElementHelpers};
use crate::dom::mutationobserver::{Mutation, MutationObserver};
use crate::dom::namednodemap::NamedNodeMap;
use crate::dom::node::{
document_from_node, window_from_node, BindContext, ChildrenMutation, LayoutNodeHelpers, Node,
NodeDamage, NodeFlags, ShadowIncluding, UnbindContext,
};
use crate::dom::nodelist::NodeList;
use crate::dom::promise::Promise;
use crate::dom::raredata::ElementRareData;
use crate::dom::servoparser::ServoParser;
use crate::dom::shadowroot::{IsUserAgentWidget, ShadowRoot};
use crate::dom::text::Text;
use crate::dom::validation::Validatable;
use crate::dom::validitystate::ValidationFlags;
use crate::dom::virtualmethods::{vtable_for, VirtualMethods};
use crate::dom::window::ReflowReason;
use crate::script_thread::ScriptThread;
use crate::stylesheet_loader::StylesheetOwner;
use crate::task::TaskOnce;
// TODO: Update focus state when the top-level browsing context gains or loses system focus,
// and when the element enters or leaves a browsing context container.
// https://html.spec.whatwg.org/multipage/#selector-focus
#[dom_struct]
pub struct Element {
node: Node,
#[no_trace]
local_name: LocalName,
tag_name: TagName,
#[no_trace]
namespace: Namespace,
#[no_trace]
prefix: DomRefCell<Option<Prefix>>,
attrs: DomRefCell<Vec<Dom<Attr>>>,
#[no_trace]
id_attribute: DomRefCell<Option<Atom>>,
#[no_trace]
is: DomRefCell<Option<LocalName>>,
#[ignore_malloc_size_of = "Arc"]
#[no_trace]
style_attribute: DomRefCell<Option<Arc<Locked<PropertyDeclarationBlock>>>>,
attr_list: MutNullableDom<NamedNodeMap>,
class_list: MutNullableDom<DOMTokenList>,
#[no_trace]
state: Cell<ElementState>,
/// These flags are set by the style system to indicate the that certain
/// operations may require restyling this element or its descendants. The
/// flags are not atomic, so the style system takes care of only set them
/// when it has exclusive access to the element.
#[ignore_malloc_size_of = "bitflags defined in rust-selectors"]
#[no_trace]
selector_flags: Cell<ElementSelectorFlags>,
rare_data: DomRefCell<Option<Box<ElementRareData>>>,
}
impl fmt::Debug for Element {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "<{}", self.local_name)?;
if let Some(ref id) = *self.id_attribute.borrow() {
write!(f, " id={}", id)?;
}
write!(f, ">")
}
}
impl fmt::Debug for DomRoot<Element> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
(**self).fmt(f)
}
}
#[derive(MallocSizeOf, PartialEq)]
pub enum ElementCreator {
ParserCreated(u64),
ScriptCreated,
}
pub enum CustomElementCreationMode {
Synchronous,
Asynchronous,
}
impl ElementCreator {
pub fn is_parser_created(&self) -> bool {
match *self {
ElementCreator::ParserCreated(_) => true,
ElementCreator::ScriptCreated => false,
}
}
pub fn return_line_number(&self) -> u64 {
match *self {
ElementCreator::ParserCreated(l) => l,
ElementCreator::ScriptCreated => 1,
}
}
}
pub enum AdjacentPosition {
BeforeBegin,
AfterEnd,
AfterBegin,
BeforeEnd,
}
impl FromStr for AdjacentPosition {
type Err = Error;
fn from_str(position: &str) -> Result<Self, Self::Err> {
match_ignore_ascii_case! { position,
"beforebegin" => Ok(AdjacentPosition::BeforeBegin),
"afterbegin" => Ok(AdjacentPosition::AfterBegin),
"beforeend" => Ok(AdjacentPosition::BeforeEnd),
"afterend" => Ok(AdjacentPosition::AfterEnd),
_ => Err(Error::Syntax)
}
}
}
//
// Element methods
//
impl Element {
pub fn create(
name: QualName,
is: Option<LocalName>,
document: &Document,
creator: ElementCreator,
mode: CustomElementCreationMode,
proto: Option<HandleObject>,
) -> DomRoot<Element> {
create_element(name, is, document, creator, mode, proto)
}
pub fn new_inherited(
local_name: LocalName,
namespace: Namespace,
prefix: Option<Prefix>,
document: &Document,
) -> Element {
Element::new_inherited_with_state(
ElementState::empty(),
local_name,
namespace,
prefix,
document,
)
}
pub fn new_inherited_with_state(
state: ElementState,
local_name: LocalName,
namespace: Namespace,
prefix: Option<Prefix>,
document: &Document,
) -> Element {
Element {
node: Node::new_inherited(document),
local_name,
tag_name: TagName::new(),
namespace,
prefix: DomRefCell::new(prefix),
attrs: DomRefCell::new(vec![]),
id_attribute: DomRefCell::new(None),
is: DomRefCell::new(None),
style_attribute: DomRefCell::new(None),
attr_list: Default::default(),
class_list: Default::default(),
state: Cell::new(state),
selector_flags: Cell::new(ElementSelectorFlags::empty()),
rare_data: Default::default(),
}
}
pub fn new(
local_name: LocalName,
namespace: Namespace,
prefix: Option<Prefix>,
document: &Document,
proto: Option<HandleObject>,
) -> DomRoot<Element> {
Node::reflect_node_with_proto(
Box::new(Element::new_inherited(
local_name, namespace, prefix, document,
)),
document,
proto,
)
}
impl_rare_data!(ElementRareData);
pub fn restyle(&self, damage: NodeDamage) {
let doc = self.node.owner_doc();
let mut restyle = doc.ensure_pending_restyle(self);
// FIXME(bholley): I think we should probably only do this for
// NodeStyleDamaged, but I'm preserving existing behavior.
restyle.hint.insert(RestyleHint::RESTYLE_SELF);
if damage == NodeDamage::OtherNodeDamage {
doc.note_node_with_dirty_descendants(self.upcast());
restyle.damage = RestyleDamage::rebuild_and_reflow();
}
}
pub fn set_is(&self, is: LocalName) {
*self.is.borrow_mut() = Some(is);
}
pub fn get_is(&self) -> Option<LocalName> {
self.is.borrow().clone()
}
/// <https://dom.spec.whatwg.org/#concept-element-custom-element-state>
pub fn set_custom_element_state(&self, state: CustomElementState) {
// no need to inflate rare data for uncustomized
if state != CustomElementState::Uncustomized || self.rare_data().is_some() {
self.ensure_rare_data().custom_element_state = state;
}
let in_defined_state = matches!(
state,
CustomElementState::Uncustomized | CustomElementState::Custom
);
self.set_state(ElementState::DEFINED, in_defined_state)
}
pub fn get_custom_element_state(&self) -> CustomElementState {
if let Some(rare_data) = self.rare_data().as_ref() {
return rare_data.custom_element_state;
}
CustomElementState::Uncustomized
}
pub fn set_custom_element_definition(&self, definition: Rc<CustomElementDefinition>) {
self.ensure_rare_data().custom_element_definition = Some(definition);
}
pub fn get_custom_element_definition(&self) -> Option<Rc<CustomElementDefinition>> {
self.rare_data().as_ref()?.custom_element_definition.clone()
}
pub fn clear_custom_element_definition(&self) {
self.ensure_rare_data().custom_element_definition = None;
}
pub fn push_callback_reaction(&self, function: Rc<Function>, args: Box<[Heap<JSVal>]>) {
self.ensure_rare_data()
.custom_element_reaction_queue
.push(CustomElementReaction::Callback(function, args));
}
pub fn push_upgrade_reaction(&self, definition: Rc<CustomElementDefinition>) {
self.ensure_rare_data()
.custom_element_reaction_queue
.push(CustomElementReaction::Upgrade(definition));
}
pub fn clear_reaction_queue(&self) {
if let Some(ref mut rare_data) = *self.rare_data_mut() {
rare_data.custom_element_reaction_queue.clear();
}
}
pub fn invoke_reactions(&self) {
loop {
rooted_vec!(let mut reactions);
match *self.rare_data_mut() {
Some(ref mut data) => {
mem::swap(&mut *reactions, &mut data.custom_element_reaction_queue)
},
None => break,
};
if reactions.is_empty() {
break;
}
for reaction in reactions.iter() {
reaction.invoke(self);
}
reactions.clear();
}
}
/// style will be `None` for elements in a `display: none` subtree. otherwise, the element has a
/// layout box iff it doesn't have `display: none`.
pub fn style(&self) -> Option<Arc<ComputedValues>> {
self.upcast::<Node>().style()
}
// https://drafts.csswg.org/cssom-view/#css-layout-box
pub fn has_css_layout_box(&self) -> bool {
self.style()
.map_or(false, |s| !s.get_box().clone_display().is_none())
}
// https://drafts.csswg.org/cssom-view/#potentially-scrollable
fn is_potentially_scrollable_body(&self) -> bool {
let node = self.upcast::<Node>();
debug_assert!(
node.owner_doc().GetBody().as_deref() == self.downcast::<HTMLElement>(),
"Called is_potentially_scrollable_body on element that is not the <body>"
);
// "An element body (which will be the body element) is potentially
// scrollable if all of the following conditions are true:
// - body has an associated box."
if !self.has_css_layout_box() {
return false;
}
// " - body’s parent element’s computed value of the overflow-x or
// overflow-y properties is neither visible nor clip."
if let Some(parent) = node.GetParentElement() {
if let Some(style) = parent.style() {
if !style.get_box().clone_overflow_x().is_scrollable() &&
!style.get_box().clone_overflow_y().is_scrollable()
{
return false;
}
};
}
// " - body’s computed value of the overflow-x or overflow-y properties
// is neither visible nor clip."
if let Some(style) = self.style() {
if !style.get_box().clone_overflow_x().is_scrollable() &&
!style.get_box().clone_overflow_y().is_scrollable()
{
return false;
}
};
true
}
// https://drafts.csswg.org/cssom-view/#scrolling-box
fn has_scrolling_box(&self) -> bool {
// TODO: scrolling mechanism, such as scrollbar (We don't have scrollbar yet)
// self.has_scrolling_mechanism()
self.style().map_or(false, |style| {
style.get_box().clone_overflow_x().is_scrollable() ||
style.get_box().clone_overflow_y().is_scrollable()
})
}
fn has_overflow(&self) -> bool {
self.ScrollHeight() > self.ClientHeight() || self.ScrollWidth() > self.ClientWidth()
}
fn shadow_root(&self) -> Option<DomRoot<ShadowRoot>> {
self.rare_data()
.as_ref()?
.shadow_root
.as_ref()
.map(|sr| DomRoot::from_ref(&**sr))
}
pub fn is_shadow_host(&self) -> bool {
self.shadow_root().is_some()
}
/// <https://dom.spec.whatwg.org/#dom-element-attachshadow>
/// XXX This is not exposed to web content yet. It is meant to be used
/// for UA widgets only.
pub fn attach_shadow(&self, is_ua_widget: IsUserAgentWidget) -> Fallible<DomRoot<ShadowRoot>> {
// Step 1.
if self.namespace != ns!(html) {
return Err(Error::NotSupported);
}
// Step 2.
match self.local_name() {
&local_name!("article") |
&local_name!("aside") |
&local_name!("blockquote") |
&local_name!("body") |
&local_name!("div") |
&local_name!("footer") |
&local_name!("h1") |
&local_name!("h2") |
&local_name!("h3") |
&local_name!("h4") |
&local_name!("h5") |
&local_name!("h6") |
&local_name!("header") |
&local_name!("main") |
&local_name!("nav") |
&local_name!("p") |
&local_name!("section") |
&local_name!("span") => {},
&local_name!("video") | &local_name!("audio")
if is_ua_widget == IsUserAgentWidget::Yes => {},
_ => return Err(Error::NotSupported),
};
// Step 3.
if self.is_shadow_host() {
return Err(Error::InvalidState);
}
// Steps 4, 5 and 6.
let shadow_root = ShadowRoot::new(self, &self.node.owner_doc());
self.ensure_rare_data().shadow_root = Some(Dom::from_ref(&*shadow_root));
shadow_root
.upcast::<Node>()
.set_containing_shadow_root(Some(&shadow_root));
if self.is_connected() {
self.node.owner_doc().register_shadow_root(&shadow_root);
}
self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
Ok(shadow_root)
}
pub fn detach_shadow(&self) {
if let Some(ref shadow_root) = self.shadow_root() {
self.upcast::<Node>().note_dirty_descendants();
shadow_root.detach();
self.ensure_rare_data().shadow_root = None;
} else {
debug_assert!(false, "Trying to detach a non-attached shadow root");
}
}
// https://html.spec.whatwg.org/multipage/#translation-mode
pub fn is_translate_enabled(&self) -> bool {
let name = &html5ever::local_name!("translate");
if self.has_attribute(name) {
match_ignore_ascii_case! { &*self.get_string_attribute(name),
"yes" | "" => return true,
"no" => return false,
_ => {},
}
}
if let Some(parent) = self.upcast::<Node>().GetParentNode() {
if let Some(elem) = parent.downcast::<Element>() {
return elem.is_translate_enabled();
}
}
true
}
// https://html.spec.whatwg.org/multipage/#the-directionality
pub fn directionality(&self) -> String {
self.downcast::<HTMLElement>()
.and_then(|html_element| html_element.directionality())
.unwrap_or_else(|| {
let node = self.upcast::<Node>();
node.parent_directionality()
})
}
pub(crate) fn is_root(&self) -> bool {
match self.node.GetParentNode() {
None => false,
Some(node) => node.is::<Document>(),
}
}
}
#[inline]
pub fn get_attr_for_layout<'dom>(
elem: LayoutDom<'dom, Element>,
namespace: &Namespace,
name: &LocalName,
) -> Option<LayoutDom<'dom, Attr>> {
elem.attrs()
.iter()
.find(|attr| name == attr.local_name() && namespace == attr.namespace())
.cloned()
}
pub trait LayoutElementHelpers<'dom> {
fn attrs(self) -> &'dom [LayoutDom<'dom, Attr>];
fn has_class_for_layout(self, name: &AtomIdent, case_sensitivity: CaseSensitivity) -> bool;
fn get_classes_for_layout(self) -> Option<&'dom [Atom]>;
fn synthesize_presentational_hints_for_legacy_attributes<V>(self, hints: &mut V)
where
V: Push<ApplicableDeclarationBlock>;
fn get_span(self) -> Option<u32>;
fn get_colspan(self) -> Option<u32>;
fn get_rowspan(self) -> Option<u32>;
fn is_html_element(self) -> bool;
fn id_attribute(self) -> *const Option<Atom>;
fn style_attribute(self) -> *const Option<Arc<Locked<PropertyDeclarationBlock>>>;
fn local_name(self) -> &'dom LocalName;
fn namespace(self) -> &'dom Namespace;
fn get_lang_for_layout(self) -> String;
fn get_state_for_layout(self) -> ElementState;
fn insert_selector_flags(self, flags: ElementSelectorFlags);
fn get_selector_flags(self) -> ElementSelectorFlags;
/// The shadow root this element is a host of.
fn get_shadow_root_for_layout(self) -> Option<LayoutDom<'dom, ShadowRoot>>;
fn get_attr_for_layout(
self,
namespace: &Namespace,
name: &LocalName,
) -> Option<&'dom AttrValue>;
fn get_attr_val_for_layout(self, namespace: &Namespace, name: &LocalName) -> Option<&'dom str>;
fn get_attr_vals_for_layout(self, name: &LocalName) -> Vec<&'dom AttrValue>;
}
impl<'dom> LayoutDom<'dom, Element> {
pub(super) fn focus_state(self) -> bool {
self.unsafe_get().state.get().contains(ElementState::FOCUS)
}
}
impl<'dom> LayoutElementHelpers<'dom> for LayoutDom<'dom, Element> {
#[allow(unsafe_code)]
#[inline]
fn attrs(self) -> &'dom [LayoutDom<'dom, Attr>] {
unsafe { LayoutDom::to_layout_slice(self.unsafe_get().attrs.borrow_for_layout()) }
}
#[inline]
fn has_class_for_layout(self, name: &AtomIdent, case_sensitivity: CaseSensitivity) -> bool {
get_attr_for_layout(self, &ns!(), &local_name!("class")).map_or(false, |attr| {
attr.as_tokens()
.unwrap()
.iter()
.any(|atom| case_sensitivity.eq_atom(atom, name))
})
}
#[inline]
fn get_classes_for_layout(self) -> Option<&'dom [Atom]> {
get_attr_for_layout(self, &ns!(), &local_name!("class"))
.map(|attr| attr.as_tokens().unwrap())
}
fn synthesize_presentational_hints_for_legacy_attributes<V>(self, hints: &mut V)
where
V: Push<ApplicableDeclarationBlock>,
{
// FIXME(emilio): Just a single PDB should be enough.
#[inline]
fn from_declaration(
shared_lock: &SharedRwLock,
declaration: PropertyDeclaration,
) -> ApplicableDeclarationBlock {
ApplicableDeclarationBlock::from_declarations(
Arc::new(shared_lock.wrap(PropertyDeclarationBlock::with_one(
declaration,
Importance::Normal,
))),
CascadeLevel::PresHints,
LayerOrder::root(),
)
}
let document = self.upcast::<Node>().owner_doc_for_layout();
let shared_lock = document.style_shared_lock();
let bgcolor = if let Some(this) = self.downcast::<HTMLBodyElement>() {
this.get_background_color()
} else if let Some(this) = self.downcast::<HTMLTableElement>() {
this.get_background_color()
} else if let Some(this) = self.downcast::<HTMLTableCellElement>() {
this.get_background_color()
} else if let Some(this) = self.downcast::<HTMLTableRowElement>() {
this.get_background_color()
} else if let Some(this) = self.downcast::<HTMLTableSectionElement>() {
this.get_background_color()
} else {
None
};
if let Some(color) = bgcolor {
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BackgroundColor(specified::Color::from_absolute_color(color)),
));
}
let background = if let Some(this) = self.downcast::<HTMLBodyElement>() {
this.get_background()
} else {
None
};
if let Some(url) = background {
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BackgroundImage(background_image::SpecifiedValue(
vec![specified::Image::for_cascade(url.get_arc())].into(),
)),
));
}
let color = if let Some(this) = self.downcast::<HTMLFontElement>() {
this.get_color()
} else if let Some(this) = self.downcast::<HTMLBodyElement>() {
// https://html.spec.whatwg.org/multipage/#the-page:the-body-element-20
this.get_color()
} else if let Some(this) = self.downcast::<HTMLHRElement>() {
// https://html.spec.whatwg.org/multipage/#the-hr-element-2:presentational-hints-5
this.get_color()
} else {
None
};
if let Some(color) = color {
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Color(longhands::color::SpecifiedValue(
specified::Color::from_absolute_color(color),
)),
));
}
let font_family = if let Some(this) = self.downcast::<HTMLFontElement>() {
this.get_face()
} else {
None
};
if let Some(font_family) = font_family {
// FIXME(emilio): This in Gecko parses a whole family list.
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::FontFamily(font_family::SpecifiedValue::Values(
computed::font::FontFamilyList {
list: Box::new([computed::font::SingleFontFamily::from_atom(font_family)]),
},
)),
));
}
let font_size = self
.downcast::<HTMLFontElement>()
.and_then(|this| this.get_size());
if let Some(font_size) = font_size {
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::FontSize(font_size::SpecifiedValue::from_html_size(
font_size as u8,
)),
))
}
let cellspacing = if let Some(this) = self.downcast::<HTMLTableElement>() {
this.get_cellspacing()
} else {
None
};
if let Some(cellspacing) = cellspacing {
let width_value = specified::Length::from_px(cellspacing as f32);
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BorderSpacing(Box::new(border_spacing::SpecifiedValue::new(
width_value.clone().into(),
width_value.into(),
))),
));
}
let size = if let Some(this) = self.downcast::<HTMLInputElement>() {
// FIXME(pcwalton): More use of atoms, please!
match self.get_attr_val_for_layout(&ns!(), &local_name!("type")) {
// Not text entry widget
Some("hidden") |
Some("date") |
Some("month") |
Some("week") |
Some("time") |
Some("datetime-local") |
Some("number") |
Some("range") |
Some("color") |
Some("checkbox") |
Some("radio") |
Some("file") |
Some("submit") |
Some("image") |
Some("reset") |
Some("button") => None,
// Others
_ => match this.size_for_layout() {
0 => None,
s => Some(s as i32),
},
}
} else {
None
};
if let Some(size) = size {
let value =
specified::NoCalcLength::ServoCharacterWidth(specified::CharacterWidth(size));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Width(specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Length(value),
))),
));
}
let width = if let Some(this) = self.downcast::<HTMLIFrameElement>() {
this.get_width()
} else if let Some(this) = self.downcast::<HTMLImageElement>() {
this.get_width()
} else if let Some(this) = self.downcast::<HTMLTableElement>() {
this.get_width()
} else if let Some(this) = self.downcast::<HTMLTableCellElement>() {
this.get_width()
} else if let Some(this) = self.downcast::<HTMLHRElement>() {
// https://html.spec.whatwg.org/multipage/#the-hr-element-2:attr-hr-width
this.get_width()
} else if let Some(this) = self.downcast::<HTMLCanvasElement>() {
this.get_width()
} else {
LengthOrPercentageOrAuto::Auto
};
// FIXME(emilio): Use from_computed value here and below.
match width {
LengthOrPercentageOrAuto::Auto => {},
LengthOrPercentageOrAuto::Percentage(percentage) => {
let width_value = specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Percentage(computed::Percentage(percentage)),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Width(width_value),
));
},
LengthOrPercentageOrAuto::Length(length) => {
let width_value = specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Length(specified::NoCalcLength::Absolute(
specified::AbsoluteLength::Px(length.to_f32_px()),
)),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Width(width_value),
));
},
}
let height = if let Some(this) = self.downcast::<HTMLIFrameElement>() {
this.get_height()
} else if let Some(this) = self.downcast::<HTMLImageElement>() {
this.get_height()
} else if let Some(this) = self.downcast::<HTMLCanvasElement>() {
this.get_height()
} else {
LengthOrPercentageOrAuto::Auto
};
match height {
LengthOrPercentageOrAuto::Auto => {},
LengthOrPercentageOrAuto::Percentage(percentage) => {
let height_value = specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Percentage(computed::Percentage(percentage)),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Height(height_value),
));
},
LengthOrPercentageOrAuto::Length(length) => {
let height_value = specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Length(specified::NoCalcLength::Absolute(
specified::AbsoluteLength::Px(length.to_f32_px()),
)),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Height(height_value),
));
},
}
let cols = if let Some(this) = self.downcast::<HTMLTextAreaElement>() {
match this.get_cols() {
0 => None,
c => Some(c as i32),
}
} else {
None
};
if let Some(cols) = cols {
// TODO(mttr) ServoCharacterWidth uses the size math for <input type="text">, but
// the math for <textarea> is a little different since we need to take
// scrollbar size into consideration (but we don't have a scrollbar yet!)
//
// https://html.spec.whatwg.org/multipage/#textarea-effective-width
let value =
specified::NoCalcLength::ServoCharacterWidth(specified::CharacterWidth(cols));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Width(specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Length(value),
))),
));
}
let rows = if let Some(this) = self.downcast::<HTMLTextAreaElement>() {
match this.get_rows() {
0 => None,
r => Some(r as i32),
}
} else {
None
};
if let Some(rows) = rows {
// TODO(mttr) This should take scrollbar size into consideration.
//
// https://html.spec.whatwg.org/multipage/#textarea-effective-height
let value = specified::NoCalcLength::FontRelative(specified::FontRelativeLength::Em(
rows as CSSFloat,
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::Height(specified::Size::LengthPercentage(NonNegative(
specified::LengthPercentage::Length(value),
))),
));
}
let border = if let Some(this) = self.downcast::<HTMLTableElement>() {
this.get_border()
} else {
None
};
if let Some(border) = border {
let width_value = specified::BorderSideWidth::from_px(border as f32);
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BorderTopWidth(width_value.clone()),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BorderLeftWidth(width_value.clone()),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BorderBottomWidth(width_value.clone()),
));
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::BorderRightWidth(width_value),
));
}
if let Some(cellpadding) = self
.downcast::<HTMLTableCellElement>()
.and_then(|this| this.get_table())
.and_then(|table| table.get_cellpadding())
{
let cellpadding = NonNegative(specified::LengthPercentage::Length(
specified::NoCalcLength::from_px(cellpadding as f32),