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style: Derive ToCss for MozScriptLevel.

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Emilio Cobos Álvarez 2017-11-11 14:30:14 +01:00
parent 06f8f0384b
commit 1b533f9bdc
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1 changed files with 8 additions and 16 deletions
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24
components/style/values/specified/font.rs
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@ -977,33 +977,25 @@ impl Parse for MozScriptMinSize {
}
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(Clone, Copy, Debug, PartialEq)]
#[derive(Clone, Copy, Debug, PartialEq, ToCss)]
/// Changes the scriptlevel in effect for the children.
/// Ref: https://wiki.mozilla.org/MathML:mstyle
///
/// The main effect of scriptlevel is to control the font size.
/// https://www.w3.org/TR/MathML3/chapter3.html#presm.scriptlevel
pub enum MozScriptLevel {
/// Change `font-size` relatively
/// Change `font-size` relatively.
Relative(i32),
/// Change `font-size` absolutely
/// Change `font-size` absolutely.
///
/// Should only be serialized by presentation attributes, so even though
/// serialization for this would look the same as for the `Relative`
/// variant, it is unexposed, so no big deal.
Absolute(i32),
/// Change `font-size` automatically
/// Change `font-size` automatically.
Auto
}
impl ToCss for MozScriptLevel {
fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
match *self {
MozScriptLevel::Auto => dest.write_str("auto"),
MozScriptLevel::Relative(rel) => rel.to_css(dest),
// can only be specified by pres attrs; should not
// serialize to anything else
MozScriptLevel::Absolute(_) => Ok(()),
}
}
}
impl Parse for MozScriptLevel {
fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<MozScriptLevel, ParseError<'i>> {
if let Ok(i) = input.try(|i| i.expect_integer()) {