/
element.rs
3616 lines (3196 loc) · 123 KB
/
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 crate::dom::activation::Activatable;
use crate::dom::attr::{Attr, AttrHelpersForLayout};
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::AttrBinding::AttrMethods;
use crate::dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
use crate::dom::bindings::codegen::Bindings::ElementBinding;
use crate::dom::bindings::codegen::Bindings::ElementBinding::ElementMethods;
use crate::dom::bindings::codegen::Bindings::EventBinding::EventMethods;
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::ShadowRootBinding::ShadowRootMethods;
use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
use crate::dom::bindings::codegen::Bindings::WindowBinding::{ScrollBehavior, ScrollToOptions};
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::{Document, LayoutDocumentHelpers};
use crate::dom::documentfragment::DocumentFragment;
use crate::dom::domrect::DOMRect;
use crate::dom::domtokenlist::DOMTokenList;
use crate::dom::event::Event;
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::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};
use crate::dom::node::{BindContext, NodeDamage, NodeFlags, UnbindContext};
use crate::dom::node::{ChildrenMutation, LayoutNodeHelpers, Node, ShadowIncluding};
use crate::dom::nodelist::NodeList;
use crate::dom::promise::Promise;
use crate::dom::raredata::ElementRareData;
use crate::dom::servoparser::ServoParser;
use crate::dom::shadowroot::ShadowRoot;
use crate::dom::text::Text;
use crate::dom::validation::Validatable;
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;
use devtools_traits::AttrInfo;
use dom_struct::dom_struct;
use html5ever::serialize;
use html5ever::serialize::SerializeOpts;
use html5ever::serialize::TraversalScope;
use html5ever::serialize::TraversalScope::{ChildrenOnly, IncludeNode};
use html5ever::{LocalName, Namespace, Prefix, QualName};
use js::jsapi::Heap;
use js::jsval::JSVal;
use msg::constellation_msg::InputMethodType;
use net_traits::request::CorsSettings;
use ref_filter_map::ref_filter_map;
use script_layout_interface::message::ReflowGoal;
use selectors::attr::{AttrSelectorOperation, CaseSensitivity, NamespaceConstraint};
use selectors::matching::{ElementSelectorFlags, MatchingContext};
use selectors::sink::Push;
use selectors::Element as SelectorsElement;
use servo_arc::Arc;
use servo_atoms::Atom;
use std::borrow::Cow;
use std::cell::{Cell, Ref};
use std::default::Default;
use std::fmt;
use std::mem;
use std::rc::Rc;
use std::str::FromStr;
use style::applicable_declarations::ApplicableDeclarationBlock;
use style::attr::{AttrValue, LengthOrPercentageOrAuto};
use style::context::QuirksMode;
use style::dom_apis;
use style::element_state::ElementState;
use style::invalidation::element::restyle_hints::RestyleHint;
use style::properties::longhands::{
self, background_image, border_spacing, font_family, font_size,
};
use style::properties::longhands::{overflow_x, overflow_y};
use style::properties::{parse_style_attribute, PropertyDeclarationBlock};
use style::properties::{ComputedValues, Importance, PropertyDeclaration};
use style::rule_tree::CascadeLevel;
use style::selector_parser::extended_filtering;
use style::selector_parser::{
NonTSPseudoClass, PseudoElement, RestyleDamage, SelectorImpl, SelectorParser,
};
use style::shared_lock::{Locked, SharedRwLock};
use style::thread_state;
use style::values::generics::NonNegative;
use style::values::{computed, specified};
use style::values::{CSSFloat, Either};
use style::CaseSensitivityExt;
use xml5ever::serialize as xmlSerialize;
use xml5ever::serialize::SerializeOpts as XmlSerializeOpts;
use xml5ever::serialize::TraversalScope as XmlTraversalScope;
use xml5ever::serialize::TraversalScope::ChildrenOnly as XmlChildrenOnly;
use xml5ever::serialize::TraversalScope::IncludeNode as XmlIncludeNode;
// 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,
local_name: LocalName,
tag_name: TagName,
namespace: Namespace,
prefix: DomRefCell<Option<Prefix>>,
attrs: DomRefCell<Vec<Dom<Attr>>>,
id_attribute: DomRefCell<Option<Atom>>,
is: DomRefCell<Option<LocalName>>,
#[ignore_malloc_size_of = "Arc"]
style_attribute: DomRefCell<Option<Arc<Locked<PropertyDeclarationBlock>>>>,
attr_list: MutNullableDom<NamedNodeMap>,
class_list: MutNullableDom<DOMTokenList>,
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"]
selector_flags: Cell<ElementSelectorFlags>,
rare_data: 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)
}
}
}
/// Whether a shadow root hosts an User Agent widget.
#[derive(PartialEq)]
pub enum IsUserAgentWidget {
No,
Yes,
}
//
// Element methods
//
impl Element {
pub fn create(
name: QualName,
is: Option<LocalName>,
document: &Document,
creator: ElementCreator,
mode: CustomElementCreationMode,
) -> DomRoot<Element> {
create_element(name, is, document, creator, mode)
}
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: local_name,
tag_name: TagName::new(),
namespace: 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,
) -> DomRoot<Element> {
Node::reflect_node(
Box::new(Element::new_inherited(
local_name, namespace, prefix, document,
)),
document,
ElementBinding::Wrap,
)
}
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 {
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()
}
pub fn set_custom_element_state(&self, state: CustomElementState) {
self.rare_data.custom_element_state.set(state);
}
pub fn get_custom_element_state(&self) -> CustomElementState {
self.rare_data.custom_element_state.get()
}
pub fn set_custom_element_definition(&self, definition: Rc<CustomElementDefinition>) {
*self.rare_data.custom_element_definition.borrow_mut() = Some(definition);
}
pub fn get_custom_element_definition(&self) -> Option<Rc<CustomElementDefinition>> {
(*self.rare_data.custom_element_definition.borrow()).clone()
}
pub fn push_callback_reaction(&self, function: Rc<Function>, args: Box<[Heap<JSVal>]>) {
self.rare_data
.custom_element_reaction_queue
.borrow_mut()
.push(CustomElementReaction::Callback(function, args));
}
pub fn push_upgrade_reaction(&self, definition: Rc<CustomElementDefinition>) {
self.rare_data
.custom_element_reaction_queue
.borrow_mut()
.push(CustomElementReaction::Upgrade(definition));
}
pub fn clear_reaction_queue(&self) {
self.rare_data
.custom_element_reaction_queue
.borrow_mut()
.clear();
}
pub fn invoke_reactions(&self) {
// TODO: This is not spec compliant, as this will allow some reactions to be processed
// after clear_reaction_queue has been called.
rooted_vec!(let mut reactions);
while !self
.rare_data
.custom_element_reaction_queue
.borrow()
.is_empty()
{
mem::swap(
&mut *reactions,
&mut *self.rare_data.custom_element_reaction_queue.borrow_mut(),
);
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>> {
window_from_node(self).style_query(self.upcast::<Node>().to_trusted_node_address())
}
// 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 potentially_scrollable(&self) -> bool {
self.has_css_layout_box() && !self.has_any_visible_overflow()
}
// 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.has_any_hidden_overflow()
}
fn has_overflow(&self) -> bool {
self.ScrollHeight() > self.ClientHeight() || self.ScrollWidth() > self.ClientWidth()
}
// TODO: Once #19183 is closed (overflow-x/y types moved out of mako), then we could implement
// a more generic `fn has_some_overflow(&self, overflow: Overflow)` rather than have
// these two `has_any_{visible,hidden}_overflow` methods which are very structurally
// similar.
/// Computed value of overflow-x or overflow-y is "visible"
fn has_any_visible_overflow(&self) -> bool {
self.style().map_or(false, |s| {
let box_ = s.get_box();
box_.clone_overflow_x() == overflow_x::computed_value::T::Visible ||
box_.clone_overflow_y() == overflow_y::computed_value::T::Visible
})
}
/// Computed value of overflow-x or overflow-y is "hidden"
fn has_any_hidden_overflow(&self) -> bool {
self.style().map_or(false, |s| {
let box_ = s.get_box();
box_.clone_overflow_x() == overflow_x::computed_value::T::Hidden ||
box_.clone_overflow_y() == overflow_y::computed_value::T::Hidden
})
}
pub fn is_shadow_host(&self) -> bool {
self.rare_data.shadow_root.get().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 = self
.rare_data
.shadow_root
.or_init(|| ShadowRoot::new(self, &*self.node.owner_doc()));
if self.is_connected() {
self.node.owner_doc().register_shadow_root(&*shadow_root);
}
Ok(shadow_root)
}
}
#[allow(unsafe_code)]
pub trait RawLayoutElementHelpers {
unsafe fn get_attr_for_layout<'a>(
&'a self,
namespace: &Namespace,
name: &LocalName,
) -> Option<&'a AttrValue>;
unsafe fn get_attr_val_for_layout<'a>(
&'a self,
namespace: &Namespace,
name: &LocalName,
) -> Option<&'a str>;
unsafe fn get_attr_vals_for_layout<'a>(&'a self, name: &LocalName) -> Vec<&'a AttrValue>;
}
#[inline]
#[allow(unsafe_code)]
pub unsafe fn get_attr_for_layout<'a>(
elem: &'a Element,
namespace: &Namespace,
name: &LocalName,
) -> Option<LayoutDom<Attr>> {
// cast to point to T in RefCell<T> directly
let attrs = elem.attrs.borrow_for_layout();
attrs
.iter()
.find(|attr| {
let attr = attr.to_layout();
*name == attr.local_name_atom_forever() && (*attr.unsafe_get()).namespace() == namespace
})
.map(|attr| attr.to_layout())
}
#[allow(unsafe_code)]
impl RawLayoutElementHelpers for Element {
#[inline]
unsafe fn get_attr_for_layout<'a>(
&'a self,
namespace: &Namespace,
name: &LocalName,
) -> Option<&'a AttrValue> {
get_attr_for_layout(self, namespace, name).map(|attr| attr.value_forever())
}
#[inline]
unsafe fn get_attr_val_for_layout<'a>(
&'a self,
namespace: &Namespace,
name: &LocalName,
) -> Option<&'a str> {
get_attr_for_layout(self, namespace, name).map(|attr| attr.value_ref_forever())
}
#[inline]
unsafe fn get_attr_vals_for_layout<'a>(&'a self, name: &LocalName) -> Vec<&'a AttrValue> {
let attrs = self.attrs.borrow_for_layout();
attrs
.iter()
.filter_map(|attr| {
let attr = attr.to_layout();
if *name == attr.local_name_atom_forever() {
Some(attr.value_forever())
} else {
None
}
})
.collect()
}
}
pub trait LayoutElementHelpers {
#[allow(unsafe_code)]
unsafe fn has_class_for_layout(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool;
#[allow(unsafe_code)]
unsafe fn get_classes_for_layout(&self) -> Option<&'static [Atom]>;
#[allow(unsafe_code)]
unsafe fn synthesize_presentational_hints_for_legacy_attributes<V>(&self, _: &mut V)
where
V: Push<ApplicableDeclarationBlock>;
#[allow(unsafe_code)]
unsafe fn get_colspan(self) -> u32;
#[allow(unsafe_code)]
unsafe fn get_rowspan(self) -> u32;
#[allow(unsafe_code)]
unsafe 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) -> &LocalName;
fn namespace(&self) -> &Namespace;
fn get_lang_for_layout(&self) -> String;
fn get_checked_state_for_layout(&self) -> bool;
fn get_indeterminate_state_for_layout(&self) -> bool;
fn get_state_for_layout(&self) -> ElementState;
fn insert_selector_flags(&self, flags: ElementSelectorFlags);
fn has_selector_flags(&self, flags: ElementSelectorFlags) -> bool;
/// The shadow root this element is a host of.
#[allow(unsafe_code)]
unsafe fn get_shadow_root_for_layout(&self) -> Option<LayoutDom<ShadowRoot>>;
}
impl LayoutElementHelpers for LayoutDom<Element> {
#[allow(unsafe_code)]
#[inline]
unsafe fn has_class_for_layout(&self, name: &Atom, case_sensitivity: CaseSensitivity) -> bool {
get_attr_for_layout(&*self.unsafe_get(), &ns!(), &local_name!("class")).map_or(
false,
|attr| {
attr.value_tokens_forever()
.unwrap()
.iter()
.any(|atom| case_sensitivity.eq_atom(atom, name))
},
)
}
#[allow(unsafe_code)]
#[inline]
unsafe fn get_classes_for_layout(&self) -> Option<&'static [Atom]> {
get_attr_for_layout(&*self.unsafe_get(), &ns!(), &local_name!("class"))
.map(|attr| attr.value_tokens_forever().unwrap())
}
#[allow(unsafe_code)]
unsafe 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,
)
}
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(color.into()),
));
}
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![
Either::Second(specified::Image::for_cascade(url.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(color.into())),
));
}
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::new(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.unsafe_get()).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::Length(NonNegative(
specified::Length::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),
));
}
}
#[allow(unsafe_code)]
unsafe fn get_colspan(self) -> u32 {
if let Some(this) = self.downcast::<HTMLTableCellElement>() {
this.get_colspan().unwrap_or(1)
} else {
// Don't panic since `display` can cause this to be called on arbitrary
// elements.
1
}
}
#[allow(unsafe_code)]
unsafe fn get_rowspan(self) -> u32 {
if let Some(this) = self.downcast::<HTMLTableCellElement>() {
this.get_rowspan().unwrap_or(1)
} else {
// Don't panic since `display` can cause this to be called on arbitrary
// elements.
1
}
}
#[inline]
#[allow(unsafe_code)]
unsafe fn is_html_element(&self) -> bool {
(*self.unsafe_get()).namespace == ns!(html)
}
#[allow(unsafe_code)]
fn id_attribute(&self) -> *const Option<Atom> {
unsafe { (*self.unsafe_get()).id_attribute.borrow_for_layout() }
}
#[allow(unsafe_code)]
fn style_attribute(&self) -> *const Option<Arc<Locked<PropertyDeclarationBlock>>> {
unsafe { (*self.unsafe_get()).style_attribute.borrow_for_layout() }
}
#[allow(unsafe_code)]
fn local_name(&self) -> &LocalName {
unsafe { &(*self.unsafe_get()).local_name }
}
#[allow(unsafe_code)]
fn namespace(&self) -> &Namespace {
unsafe { &(*self.unsafe_get()).namespace }
}
#[allow(unsafe_code)]
fn get_lang_for_layout(&self) -> String {
unsafe {
let mut current_node = Some(self.upcast::<Node>());
while let Some(node) = current_node {
current_node = node.composed_parent_node_ref();
match node.downcast::<Element>().map(|el| el.unsafe_get()) {
Some(elem) => {
if let Some(attr) =