mirror of
https://github.com/servo/servo.git
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251 lines
14 KiB
Rust
251 lines
14 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Legacy presentational attributes defined in the HTML5 specification: `<td width>`,
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//! `<input size>`, and so forth.
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use node::{TElement, TElementAttributes, TNode};
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use properties::common_types::specified::CSSColor;
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use properties::DeclaredValue::SpecifiedValue;
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use properties::PropertyDeclaration::*;
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use properties::{CSSFloat, specified};
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use selector_matching::{DeclarationBlock, Stylist};
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use cssparser::Color;
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use servo_util::geometry::Au;
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use servo_util::smallvec::VecLike;
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use servo_util::str::LengthOrPercentageOrAuto;
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/// Legacy presentational attributes that take a length as defined in HTML5 § 2.4.4.4.
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#[deriving(Copy, PartialEq, Eq)]
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pub enum LengthAttribute {
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/// `<td width>`
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Width,
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}
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/// Legacy presentational attributes that take an integer as defined in HTML5 § 2.4.4.2.
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#[deriving(Copy, PartialEq, Eq)]
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pub enum IntegerAttribute {
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/// `<input size>`
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Size,
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Cols,
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Rows,
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}
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/// Legacy presentational attributes that take a nonnegative integer as defined in HTML5 § 2.4.4.2.
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#[deriving(Copy, PartialEq, Eq)]
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pub enum UnsignedIntegerAttribute {
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/// `<td border>`
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Border,
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/// `<td colspan>`
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ColSpan,
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}
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/// Legacy presentational attributes that take a simple color as defined in HTML5 § 2.4.6.
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#[deriving(Copy, PartialEq, Eq)]
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pub enum SimpleColorAttribute {
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/// `<body bgcolor>`
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BgColor,
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}
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/// Extension methods for `Stylist` that cause rules to be synthesized for legacy attributes.
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pub trait PresentationalHintSynthesis {
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/// Synthesizes rules from various HTML attributes (mostly legacy junk from HTML4) that confer
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/// *presentational hints* as defined in the HTML5 specification. This handles stuff like
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/// `<body bgcolor>`, `<input size>`, `<td width>`, and so forth.
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///
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/// NB: Beware! If you add an attribute to this list, be sure to add it to
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/// `common_style_affecting_attributes` or `rare_style_affecting_attributes` as appropriate. If
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/// you don't, you risk strange random nondeterministic failures due to false positives in
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/// style sharing.
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fn synthesize_presentational_hints_for_legacy_attributes<'a,E,N,V>(
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&self,
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node: &N,
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matching_rules_list: &mut V,
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shareable: &mut bool)
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where E: TElement<'a> +
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TElementAttributes,
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N: TNode<'a,E>,
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V: VecLike<DeclarationBlock>;
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/// Synthesizes rules for the legacy `bgcolor` attribute.
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fn synthesize_presentational_hint_for_legacy_background_color_attribute<'a,E,V>(
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&self,
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element: E,
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matching_rules_list:
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&mut V,
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shareable: &mut bool)
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where
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E: TElement<'a> +
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TElementAttributes,
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V: VecLike<
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DeclarationBlock>;
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/// Synthesizes rules for the legacy `border` attribute.
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fn synthesize_presentational_hint_for_legacy_border_attribute<'a,E,V>(
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&self,
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element: E,
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matching_rules_list: &mut V,
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shareable: &mut bool)
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where
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E: TElement<'a> +
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TElementAttributes,
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V: VecLike<DeclarationBlock>;
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}
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impl PresentationalHintSynthesis for Stylist {
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fn synthesize_presentational_hints_for_legacy_attributes<'a,E,N,V>(
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&self,
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node: &N,
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matching_rules_list: &mut V,
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shareable: &mut bool)
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where E: TElement<'a> +
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TElementAttributes,
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N: TNode<'a,E>,
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V: VecLike<DeclarationBlock> {
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let element = node.as_element();
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match element.get_local_name() {
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name if *name == atom!("td") => {
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match element.get_length_attribute(LengthAttribute::Width) {
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LengthOrPercentageOrAuto::Auto => {}
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LengthOrPercentageOrAuto::Percentage(percentage) => {
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let width_value = specified::LengthOrPercentageOrAuto::Percentage(percentage);
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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WidthDeclaration(SpecifiedValue(width_value))));
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*shareable = false
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}
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LengthOrPercentageOrAuto::Length(length) => {
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let width_value = specified::LengthOrPercentageOrAuto::Length(specified::Length::Au(length));
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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WidthDeclaration(SpecifiedValue(width_value))));
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*shareable = false
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}
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}
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self.synthesize_presentational_hint_for_legacy_background_color_attribute(
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element,
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matching_rules_list,
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shareable);
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self.synthesize_presentational_hint_for_legacy_border_attribute(
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element,
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matching_rules_list,
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shareable);
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}
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name if *name == atom!("table") => {
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self.synthesize_presentational_hint_for_legacy_background_color_attribute(
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element,
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matching_rules_list,
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shareable);
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self.synthesize_presentational_hint_for_legacy_border_attribute(
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element,
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matching_rules_list,
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shareable);
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}
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name if *name == atom!("body") || *name == atom!("tr") || *name == atom!("thead") ||
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*name == atom!("tbody") || *name == atom!("tfoot") => {
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self.synthesize_presentational_hint_for_legacy_background_color_attribute(
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element,
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matching_rules_list,
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shareable);
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}
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name if *name == atom!("input") => {
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match element.get_integer_attribute(IntegerAttribute::Size) {
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Some(value) if value != 0 => {
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// Per HTML 4.01 § 17.4, this value is in characters if `type` is `text` or
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// `password` and in pixels otherwise.
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//
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// FIXME(pcwalton): More use of atoms, please!
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let value = match element.get_attr(&ns!(""), &atom!("type")) {
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Some("text") | Some("password") => {
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specified::Length::ServoCharacterWidth(value)
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}
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_ => specified::Length::Au(Au::from_px(value as int)),
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};
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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WidthDeclaration(SpecifiedValue(specified::LengthOrPercentageOrAuto::Length(
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value)))));
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*shareable = false
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}
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Some(_) | None => {}
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}
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}
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name if *name == atom!("textarea") => {
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match element.get_integer_attribute(IntegerAttribute::Cols) {
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Some(value) if value != 0 => {
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// TODO(mttr) ServoCharacterWidth uses the size math for <input type="text">, but
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// the math for <textarea> is a little different since we need to take
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// scrollbar size into consideration (but we don't have a scrollbar yet!)
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//
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// https://html.spec.whatwg.org/multipage/rendering.html#textarea-effective-width
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let value = specified::Length::ServoCharacterWidth(value);
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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WidthDeclaration(SpecifiedValue(specified::LengthOrPercentageOrAuto::Length(
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value)))));
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*shareable = false
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}
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Some(_) | None => {}
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}
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match element.get_integer_attribute(IntegerAttribute::Rows) {
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Some(value) if value != 0 => {
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// TODO(mttr) This should take scrollbar size into consideration.
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//
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// https://html.spec.whatwg.org/multipage/rendering.html#textarea-effective-height
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let value = specified::Length::Em(value as CSSFloat);
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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HeightDeclaration(SpecifiedValue(specified::LengthOrPercentageOrAuto::Length(
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value)))));
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*shareable = false
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}
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Some(_) | None => {}
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}
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}
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_ => {}
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}
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}
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fn synthesize_presentational_hint_for_legacy_background_color_attribute<'a,E,V>(
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&self,
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element: E,
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matching_rules_list:
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&mut V,
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shareable: &mut bool)
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where
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E: TElement<'a> +
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TElementAttributes,
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V: VecLike<
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DeclarationBlock> {
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match element.get_simple_color_attribute(SimpleColorAttribute::BgColor) {
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None => {}
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Some(color) => {
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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BackgroundColorDeclaration(SpecifiedValue(CSSColor { parsed: Color::RGBA(color), authored: None }))));
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*shareable = false
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}
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}
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}
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fn synthesize_presentational_hint_for_legacy_border_attribute<'a,E,V>(
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&self,
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element: E,
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matching_rules_list: &mut V,
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shareable: &mut bool)
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where
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E: TElement<'a> +
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TElementAttributes,
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V: VecLike<DeclarationBlock> {
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match element.get_unsigned_integer_attribute(UnsignedIntegerAttribute::Border) {
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None => {}
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Some(length) => {
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let width_value = specified::Length::Au(Au::from_px(length as int));
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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BorderTopWidthDeclaration(SpecifiedValue(width_value))));
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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BorderLeftWidthDeclaration(SpecifiedValue(width_value))));
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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BorderBottomWidthDeclaration(SpecifiedValue(width_value))));
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matching_rules_list.vec_push(DeclarationBlock::from_declaration(
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BorderRightWidthDeclaration(SpecifiedValue(width_value))));
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*shareable = false
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}
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}
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}
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}
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