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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/. */
//! Legacy presentational attributes defined in the HTML5 specification: `<td width>`,
//! `<input size>`, and so forth.
use std::sync::Arc;
use selectors::tree::{TElement, TNode};
use selectors::matching::DeclarationBlock;
use node::TElementAttributes;
use values::specified::CSSColor;
use values::{CSSFloat, specified};
use properties::DeclaredValue::SpecifiedValue;
use properties::PropertyDeclaration;
use properties::longhands;
use selector_matching::Stylist;
use cssparser::Color;
use selectors::smallvec::VecLike;
use util::geometry::Au;
use util::str::LengthOrPercentageOrAuto;
/// Legacy presentational attributes that take a length as defined in HTML5 § 2.4.4.4.
#[derive(Copy, PartialEq, Eq)]
pub enum LengthAttribute {
/// `<td width>`
Width,
}
/// Legacy presentational attributes that take an integer as defined in HTML5 § 2.4.4.2.
#[derive(Copy, PartialEq, Eq)]
pub enum IntegerAttribute {
/// `<input size>`
Size,
Cols,
Rows,
}
/// Legacy presentational attributes that take a nonnegative integer as defined in HTML5 § 2.4.4.2.
#[derive(Copy, PartialEq, Eq)]
pub enum UnsignedIntegerAttribute {
/// `<td border>`
Border,
/// `<td colspan>`
ColSpan,
}
/// Legacy presentational attributes that take a simple color as defined in HTML5 § 2.4.6.
#[derive(Copy, PartialEq, Eq)]
pub enum SimpleColorAttribute {
/// `<body bgcolor>`
BgColor,
}
/// Extension methods for `Stylist` that cause rules to be synthesized for legacy attributes.
pub trait PresentationalHintSynthesis {
/// Synthesizes rules from various HTML attributes (mostly legacy junk from HTML4) that confer
/// *presentational hints* as defined in the HTML5 specification. This handles stuff like
/// `<body bgcolor>`, `<input size>`, `<td width>`, and so forth.
///
/// NB: Beware! If you add an attribute to this list, be sure to add it to
/// `common_style_affecting_attributes` or `rare_style_affecting_attributes` as appropriate. If
/// you don't, you risk strange random nondeterministic failures due to false positives in
/// style sharing.
fn synthesize_presentational_hints_for_legacy_attributes<'a,E,N,V>(
&self,
node: &N,
matching_rules_list: &mut V,
shareable: &mut bool)
where E: TElement<'a> +
TElementAttributes,
N: TNode<'a,E>,
V: VecLike<DeclarationBlock<Vec<PropertyDeclaration>>>;
/// Synthesizes rules for the legacy `bgcolor` attribute.
fn synthesize_presentational_hint_for_legacy_background_color_attribute<'a,E,V>(
&self,
element: E,
matching_rules_list:
&mut V,
shareable: &mut bool)
where
E: TElement<'a> +
TElementAttributes,
V: VecLike<
DeclarationBlock<Vec<PropertyDeclaration>>>;
/// Synthesizes rules for the legacy `border` attribute.
fn synthesize_presentational_hint_for_legacy_border_attribute<'a,E,V>(
&self,
element: E,
matching_rules_list: &mut V,
shareable: &mut bool)
where
E: TElement<'a> +
TElementAttributes,
V: VecLike<DeclarationBlock<Vec<PropertyDeclaration>>>;
}
impl PresentationalHintSynthesis for Stylist {
fn synthesize_presentational_hints_for_legacy_attributes<'a,E,N,V>(
&self,
node: &N,
matching_rules_list: &mut V,
shareable: &mut bool)
where E: TElement<'a> +
TElementAttributes,
N: TNode<'a,E>,
V: VecLike<DeclarationBlock<Vec<PropertyDeclaration>>> {
let element = node.as_element();
match element.get_local_name() {
name if *name == atom!("td") => {
match element.get_length_attribute(LengthAttribute::Width) {
LengthOrPercentageOrAuto::Auto => {}
LengthOrPercentageOrAuto::Percentage(percentage) => {
let width_value = specified::LengthOrPercentageOrAuto::Percentage(percentage);
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::Width(SpecifiedValue(width_value))));
*shareable = false
}
LengthOrPercentageOrAuto::Length(length) => {
let width_value = specified::LengthOrPercentageOrAuto::Length(specified::Length::Absolute(length));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::Width(SpecifiedValue(width_value))));
*shareable = false
}
}
self.synthesize_presentational_hint_for_legacy_background_color_attribute(
element,
matching_rules_list,
shareable);
self.synthesize_presentational_hint_for_legacy_border_attribute(
element,
matching_rules_list,
shareable);
}
name if *name == atom!("table") => {
self.synthesize_presentational_hint_for_legacy_background_color_attribute(
element,
matching_rules_list,
shareable);
self.synthesize_presentational_hint_for_legacy_border_attribute(
element,
matching_rules_list,
shareable);
}
name if *name == atom!("body") || *name == atom!("tr") || *name == atom!("thead") ||
*name == atom!("tbody") || *name == atom!("tfoot") => {
self.synthesize_presentational_hint_for_legacy_background_color_attribute(
element,
matching_rules_list,
shareable);
}
name if *name == atom!("input") => {
match element.get_integer_attribute(IntegerAttribute::Size) {
Some(value) if value != 0 => {
// Per HTML 4.01 § 17.4, this value is in characters if `type` is `text` or
// `password` and in pixels otherwise.
//
// FIXME(pcwalton): More use of atoms, please!
let value = match element.get_attr(&ns!(""), &atom!("type")) {
Some("text") | Some("password") => {
specified::Length::ServoCharacterWidth(specified::CharacterWidth(value))
}
_ => specified::Length::Absolute(Au::from_px(value as int)),
};
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::Width(SpecifiedValue(
specified::LengthOrPercentageOrAuto::Length(value)))));
*shareable = false
}
Some(_) | None => {}
}
}
name if *name == atom!("textarea") => {
match element.get_integer_attribute(IntegerAttribute::Cols) {
Some(value) if value != 0 => {
// 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/rendering.html#textarea-effective-width
let value = specified::Length::ServoCharacterWidth(specified::CharacterWidth(value));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::Width(SpecifiedValue(
specified::LengthOrPercentageOrAuto::Length(value)))));
*shareable = false
}
Some(_) | None => {}
}
match element.get_integer_attribute(IntegerAttribute::Rows) {
Some(value) if value != 0 => {
// TODO(mttr) This should take scrollbar size into consideration.
//
// https://html.spec.whatwg.org/multipage/rendering.html#textarea-effective-height
let value = specified::Length::FontRelative(specified::FontRelativeLength::Em(value as CSSFloat));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::Height(SpecifiedValue(
longhands::height::SpecifiedValue(
specified::LengthOrPercentageOrAuto::Length(value))))));
*shareable = false
}
Some(_) | None => {}
}
}
_ => {}
}
}
fn synthesize_presentational_hint_for_legacy_background_color_attribute<'a,E,V>(
&self,
element: E,
matching_rules_list:
&mut V,
shareable: &mut bool)
where
E: TElement<'a> +
TElementAttributes,
V: VecLike<
DeclarationBlock<Vec<PropertyDeclaration>>> {
match element.get_simple_color_attribute(SimpleColorAttribute::BgColor) {
None => {}
Some(color) => {
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::BackgroundColor(SpecifiedValue(
CSSColor { parsed: Color::RGBA(color), authored: None }))));
*shareable = false
}
}
}
fn synthesize_presentational_hint_for_legacy_border_attribute<'a,E,V>(
&self,
element: E,
matching_rules_list: &mut V,
shareable: &mut bool)
where
E: TElement<'a> +
TElementAttributes,
V: VecLike<DeclarationBlock<Vec<PropertyDeclaration>>> {
match element.get_unsigned_integer_attribute(UnsignedIntegerAttribute::Border) {
None => {}
Some(length) => {
let width_value = specified::Length::Absolute(Au::from_px(length as int));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::BorderTopWidth(SpecifiedValue(
longhands::border_top_width::SpecifiedValue(width_value)))));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::BorderLeftWidth(SpecifiedValue(
longhands::border_left_width::SpecifiedValue(width_value)))));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::BorderBottomWidth(SpecifiedValue(
longhands::border_bottom_width::SpecifiedValue(width_value)))));
matching_rules_list.vec_push(from_declaration(
PropertyDeclaration::BorderRightWidth(SpecifiedValue(
longhands::border_right_width::SpecifiedValue(width_value)))));
*shareable = false
}
}
}
}
/// A convenience function to create a declaration block from a single declaration. This is
/// primarily used in `synthesize_rules_for_legacy_attributes`.
#[inline]
pub fn from_declaration(rule: PropertyDeclaration) -> DeclarationBlock<Vec<PropertyDeclaration>> {
DeclarationBlock::from_declarations(Arc::new(vec![rule]))
}
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