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Auto merge of #16016 - Manishearth:graft-font-size, r=upsuper

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Add separate specified value for keyword font sizes

In Gecko, these keywords compute to different values depending on the
font.

See https://bugzilla.mozilla.org/show_bug.cgi?id=1341775

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This commit is contained in:
bors-servo 2017-03-20 00:28:46 -07:00 • committed by GitHub
commit 50fd39f068
6 changed files with 162 additions and 109 deletions
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5
components/script/dom/element.rs
View file

@ -478,7 +478,10 @@ impl LayoutElementHelpers for LayoutJS<Element> {
if let Some(font_size) = font_size {
hints.push(from_declaration(
shared_lock,
PropertyDeclaration::FontSize(font_size::SpecifiedValue(font_size.into()))))
PropertyDeclaration::FontSize(
font_size::SpecifiedValue::from_html_size(font_size as u8)
)
))
}
let cellspacing = if let Some(this) = self.downcast::<HTMLTableElement>() {

30
components/script/dom/htmlfontelement.rs
View file

@ -18,7 +18,6 @@ use html5ever_atoms::LocalName;
use servo_atoms::Atom;
use style::attr::AttrValue;
use style::str::{HTML_SPACE_CHARACTERS, read_numbers};
use style::values::specified;
#[dom_struct]
pub struct HTMLFontElement {
@ -62,8 +61,7 @@ impl HTMLFontElementMethods for HTMLFontElement {
// https://html.spec.whatwg.org/multipage/#dom-font-size
fn SetSize(&self, value: DOMString) {
let element = self.upcast::<Element>();
let length = parse_length(&value);
element.set_attribute(&local_name!("size"), AttrValue::Length(value.into(), length));
element.set_attribute(&local_name!("size"), parse_size(&value));
}
}
@ -76,10 +74,7 @@ impl VirtualMethods for HTMLFontElement {
match name {
&local_name!("face") => AttrValue::from_atomic(value.into()),
&local_name!("color") => AttrValue::from_legacy_color(value.into()),
&local_name!("size") => {
let length = parse_length(&value);
AttrValue::Length(value.into(), length)
},
&local_name!("size") => parse_size(&value),
_ => self.super_type().unwrap().parse_plain_attribute(name, value),
}
}
@ -88,7 +83,7 @@ impl VirtualMethods for HTMLFontElement {
pub trait HTMLFontElementLayoutHelpers {
fn get_color(&self) -> Option<RGBA>;
fn get_face(&self) -> Option<Atom>;
fn get_size(&self) -> Option<specified::Length>;
fn get_size(&self) -> Option<u32>;
}
impl HTMLFontElementLayoutHelpers for LayoutJS<HTMLFontElement> {
@ -113,18 +108,21 @@ impl HTMLFontElementLayoutHelpers for LayoutJS<HTMLFontElement> {
}
#[allow(unsafe_code)]
fn get_size(&self) -> Option<specified::Length> {
unsafe {
fn get_size(&self) -> Option<u32> {
let size = unsafe {
(*self.upcast::<Element>().unsafe_get())
.get_attr_for_layout(&ns!(), &local_name!("size"))
.and_then(AttrValue::as_length)
.cloned()
};
match size {
Some(&AttrValue::UInt(_, s)) => Some(s),
_ => None,
}
}
}
/// https://html.spec.whatwg.org/multipage/#rules-for-parsing-a-legacy-font-size
fn parse_length(mut input: &str) -> Option<specified::Length> {
fn parse_size(mut input: &str) -> AttrValue {
let original_input = input;
// Steps 1 & 2 are not relevant
// Step 3
@ -138,7 +136,7 @@ fn parse_length(mut input: &str) -> Option<specified::Length> {
let mut input_chars = input.chars().peekable();
let parse_mode = match input_chars.peek() {
// Step 4
None => return None,
None => return AttrValue::String(original_input.into()),
// Step 5
Some(&'+') => {
@ -155,7 +153,7 @@ fn parse_length(mut input: &str) -> Option<specified::Length> {
// Steps 6, 7, 8
let mut value = match read_numbers(input_chars) {
(Some(v), _) if v >= 0 => v,
_ => return None,
_ => return AttrValue::String(original_input.into()),
};
// Step 9
@ -166,5 +164,5 @@ fn parse_length(mut input: &str) -> Option<specified::Length> {
}
// Steps 10, 11, 12
Some(specified::Length::from_font_size_int(value as u8))
AttrValue::UInt(original_input.into(), value as u32)
}