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10f1ed5e31
Additionally, this patch cleans up some miscellaneous formatting issues and refactors files in `layout/css/` somewhat to eliminate needless levels of indirection. It also fixes our handling of presentational hints that only apply if border is nonzero.
152 lines
8.2 KiB
Rust
152 lines
8.2 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::{BorderBottomWidthDeclaration, BorderLeftWidthDeclaration};
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use properties::{BorderRightWidthDeclaration, BorderTopWidthDeclaration, SpecifiedValue};
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use properties::{WidthDeclaration, specified};
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use selector_matching::{DeclarationBlock, Stylist};
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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::{AutoLpa, LengthLpa, PercentageLpa};
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/// Legacy presentational attributes that take a length as defined in HTML5 § 2.4.4.4.
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pub enum LengthAttribute {
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/// `<td width>`
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WidthLengthAttribute,
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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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pub enum IntegerAttribute {
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/// `<input size>`
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SizeIntegerAttribute,
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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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pub enum UnsignedIntegerAttribute {
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/// `<td border>`
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BorderUnsignedIntegerAttribute,
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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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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 `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(WidthLengthAttribute) {
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AutoLpa => {}
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PercentageLpa(percentage) => {
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let width_value = specified::LPA_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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LengthLpa(length) => {
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let width_value = specified::LPA_Length(specified::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_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_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!("input") => {
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match element.get_integer_attribute(SizeIntegerAttribute) {
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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::ServoCharacterWidth(value)
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}
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_ => specified::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::LPA_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_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(BorderUnsignedIntegerAttribute) {
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None => {}
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Some(length) => {
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let width_value = specified::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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