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| author | Patrick Walton <pcwalton@mimiga.net> | 2014-12-08 09:47:56 -0800 |
|---|---|---|
| committer | Patrick Walton <pcwalton@mimiga.net> | 2014-12-15 17:41:25 -0800 |
| commit | e0e14c60d68474a0dec94d2ec71d979a95fbc6a6 (patch) | |
| tree | 27be7cda35002dbe587106ac221c290c59b5a651 /components/style/legacy.rs | |
| parent | 112ef5c484e821aa4869aeaf12a12146f2424fe0 (diff) | |
| download | servo-e0e14c60d68474a0dec94d2ec71d979a95fbc6a6.tar.gz servo-e0e14c60d68474a0dec94d2ec71d979a95fbc6a6.zip | |
style: Move presentational hint synthesis into `legacy.rs`.
Diffstat (limited to 'components/style/legacy.rs')
| -rw-r--r-- | components/style/legacy.rs | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/components/style/legacy.rs b/components/style/legacy.rs index f99314667b8..4a4e8a428f0 100644 --- a/components/style/legacy.rs +++ b/components/style/legacy.rs @@ -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 => {} + } + } + _ => {} + } + } +} + |