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style: Do not allow a list of strings in the @font-face src descriptor's format() function, only a single format string
This aligns with CSS Fonts 4 (rather than Fonts 3) and with behavior in other browsers; I don't expect any significant breakage, given that specifying multiple format strings was never supported in other engines AFAIK, and never served any useful purpose. Depends on D154234 Differential Revision: https://phabricator.services.mozilla.com/D154235
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b43ac59344
commit
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1 changed files with 10 additions and 19 deletions
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@ -32,7 +32,6 @@ use cssparser::{AtRuleParser, DeclarationListParser, DeclarationParser, Parser};
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use cssparser::{CowRcStr, SourceLocation};
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use selectors::parser::SelectorParseErrorKind;
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use std::fmt::{self, Write};
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use style_traits::values::SequenceWriter;
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use style_traits::{Comma, CssWriter, OneOrMoreSeparated, ParseError};
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use style_traits::{StyleParseErrorKind, ToCss};
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@ -76,8 +75,8 @@ pub enum FontFaceSourceListComponent {
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pub struct UrlSource {
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/// The specified url.
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pub url: SpecifiedUrl,
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/// The format hints specified with the `format()` function.
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pub format_hints: Vec<String>,
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/// The format hint specified with the `format()` function, if present.
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pub format_hint: Option<String>,
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}
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impl ToCss for UrlSource {
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@ -86,14 +85,9 @@ impl ToCss for UrlSource {
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W: fmt::Write,
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{
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self.url.to_css(dest)?;
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if !self.format_hints.is_empty() {
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if let Some(hint) = &self.format_hint {
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dest.write_str(" format(")?;
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{
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let mut writer = SequenceWriter::new(dest, ", ");
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for hint in self.format_hints.iter() {
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writer.item(hint)?;
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}
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}
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dest.write_str(&hint)?;
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dest.write_char(')')?;
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}
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Ok(())
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@ -338,14 +332,11 @@ impl<'a> FontFace<'a> {
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.rev()
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.filter(|source| {
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if let Source::Url(ref url_source) = **source {
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let hints = &url_source.format_hints;
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// We support only opentype fonts and truetype is an alias for
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// that format. Sources without format hints need to be
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// downloaded in case we support them.
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hints.is_empty() ||
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hints.iter().any(|hint| {
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hint == "truetype" || hint == "opentype" || hint == "woff"
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})
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url_source.format_hint.as_ref().map_or(true,
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|hint| hint == "truetype" || hint == "opentype" || hint == "woff")
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} else {
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true
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}
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@ -397,20 +388,20 @@ impl Parse for Source {
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let url = SpecifiedUrl::parse(context, input)?;
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// Parsing optional format()
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let format_hints = if input
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let format_hint = if input
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.try_parse(|input| input.expect_function_matching("format"))
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.is_ok()
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{
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input.parse_nested_block(|input| {
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input.parse_comma_separated(|input| Ok(input.expect_string()?.as_ref().to_owned()))
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Ok(Some(input.expect_string()?.as_ref().to_owned()))
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})?
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} else {
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vec![]
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None
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};
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Ok(Source::Url(UrlSource {
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url: url,
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format_hints: format_hints,
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format_hint: format_hint,
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}))
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}
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}
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