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style: Move presentational hint synthesis into legacy.rs.

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This commit is contained in:
Patrick Walton 2014-12-08 09:47:56 -08:00
parent 112ef5c484
commit e0e14c60d6
2 changed files with 81 additions and 61 deletions
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79
components/style/legacy.rs
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@ -5,6 +5,14 @@
//! Legacy presentational attributes defined in the HTML5 specification: `<td width>`,
//! `<input size>`, and so forth.
use node::{TElement, TElementAttributes, TNode};
use properties::{SpecifiedValue, WidthDeclaration, specified};
use selector_matching::{DeclarationBlock, Stylist};
use servo_util::geometry::Au;
use servo_util::smallvec::VecLike;
use servo_util::str::{AutoLpa, LengthLpa, PercentageLpa};
/// Legacy presentational attributes that take a length as defined in HTML5 § 2.4.4.4.
pub enum LengthAttribute {
/// `<td width>`
@ -17,3 +25,74 @@ pub enum IntegerAttribute {
SizeIntegerAttribute,
}
/// 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.
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>;
}
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> {
let element = node.as_element();
match element.get_local_name() {
name if *name == atom!("td") => {
match element.get_length_attribute(WidthLengthAttribute) {
AutoLpa => {}
PercentageLpa(percentage) => {
let width_value = specified::LPA_Percentage(percentage);
matching_rules_list.vec_push(DeclarationBlock::from_declaration(
WidthDeclaration(SpecifiedValue(width_value))));
*shareable = false
}
LengthLpa(length) => {
let width_value = specified::LPA_Length(specified::Au_(length));
matching_rules_list.vec_push(DeclarationBlock::from_declaration(
WidthDeclaration(SpecifiedValue(width_value))));
*shareable = false
}
};
}
name if *name == atom!("input") => {
match element.get_integer_attribute(SizeIntegerAttribute) {
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::ServoCharacterWidth(value)
}
_ => specified::Au_(Au::from_px(value as int)),
};
matching_rules_list.vec_push(DeclarationBlock::from_declaration(
WidthDeclaration(SpecifiedValue(specified::LPA_Length(
value)))));
*shareable = false
}
Some(_) | None => {}
}
}
_ => {}
}
}
}