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style: Fix parsing nested image-set funcs as valid

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Nested image-set CSS functions should fail to parse as per spec.

WPT tests (2 newly pass):
a2154e3f97/css/css-images/image-set/image-set-parsing.html (L223-L239)

Differential Revision: https://phabricator.services.mozilla.com/D170829
This commit is contained in:
CanadaHonk 2023-02-25 23:53:02 +00:00 • committed by Martin Robinson
parent 75b3bf1842
commit 4ed0f518fb
1 changed files with 31 additions and 22 deletions
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53
components/style/values/specified/image.rs
View file

@ -177,6 +177,14 @@ pub type MozImageRect = generic::GenericMozImageRect<NumberOrPercentage, Specifi
/// Empty enum on non-Gecko
pub enum MozImageRect {}
bitflags! {
struct ParseImageFlags: u8 {
const FORBID_NONE = 1 << 0;
const FORBID_IMAGE_SET = 1 << 1;
const FORBID_NON_URL = 1 << 2;
}
}
impl Parse for Image {
fn parse<'i, 't>(
context: &ParserContext,
@ -186,8 +194,7 @@ impl Parse for Image {
context,
input,
CorsMode::None,
/* allow_none = */ true,
/* only_url = */ false,
ParseImageFlags::empty()
)
}
}
@ -197,10 +204,9 @@ impl Image {
context: &ParserContext,
input: &mut Parser<'i, 't>,
cors_mode: CorsMode,
allow_none: bool,
only_url: bool,
flags: ParseImageFlags
) -> Result<Image, ParseError<'i>> {
if allow_none && input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
if !flags.contains(ParseImageFlags::FORBID_NONE) && input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
return Ok(generic::Image::None);
}
@ -210,13 +216,15 @@ impl Image {
return Ok(generic::Image::Url(url));
}
if image_set_enabled() {
if let Ok(is) = input.try_parse(|input| ImageSet::parse(context, input, cors_mode, only_url)) {
if !flags.contains(ParseImageFlags::FORBID_IMAGE_SET) && image_set_enabled() {
if let Ok(is) =
input.try_parse(|input| ImageSet::parse(context, input, cors_mode, flags))
{
return Ok(generic::Image::ImageSet(Box::new(is)));
}
}
if only_url {
if flags.contains(ParseImageFlags::FORBID_NON_URL) {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
@ -225,7 +233,7 @@ impl Image {
}
if cross_fade_enabled() {
if let Ok(cf) = input.try_parse(|input| CrossFade::parse(context, input, cors_mode)) {
if let Ok(cf) = input.try_parse(|input| CrossFade::parse(context, input, cors_mode, flags)) {
return Ok(generic::Image::CrossFade(Box::new(cf)));
}
}
@ -279,8 +287,7 @@ impl Image {
context,
input,
CorsMode::Anonymous,
/* allow_none = */ true,
/* only_url = */ false,
ParseImageFlags::empty()
)
}
@ -293,8 +300,7 @@ impl Image {
context,
input,
CorsMode::None,
/* allow_none = */ false,
/* only_url = */ true,
ParseImageFlags::FORBID_NONE | ParseImageFlags::FORBID_NON_URL
)
}
}
@ -305,10 +311,11 @@ impl CrossFade {
context: &ParserContext,
input: &mut Parser<'i, 't>,
cors_mode: CorsMode,
flags: ParseImageFlags
) -> Result<Self, ParseError<'i>> {
input.expect_function_matching("cross-fade")?;
let elements = input.parse_nested_block(|input| {
input.parse_comma_separated(|input| CrossFadeElement::parse(context, input, cors_mode))
input.parse_comma_separated(|input| CrossFadeElement::parse(context, input, cors_mode, flags))
})?;
let elements = crate::OwnedSlice::from(elements);
Ok(Self { elements })
@ -335,11 +342,12 @@ impl CrossFadeElement {
context: &ParserContext,
input: &mut Parser<'i, 't>,
cors_mode: CorsMode,
flags: ParseImageFlags
) -> Result<Self, ParseError<'i>> {
// Try and parse a leading percent sign.
let mut percent = Self::parse_percentage(context, input);
// Parse the image
let image = CrossFadeImage::parse(context, input, cors_mode)?;
let image = CrossFadeImage::parse(context, input, cors_mode, flags)?;
// Try and parse a trailing percent sign.
if percent.is_none() {
percent = Self::parse_percentage(context, input);
@ -356,11 +364,12 @@ impl CrossFadeImage {
context: &ParserContext,
input: &mut Parser<'i, 't>,
cors_mode: CorsMode,
flags: ParseImageFlags
) -> Result<Self, ParseError<'i>> {
if let Ok(image) = input.try_parse(|input| {
Image::parse_with_cors_mode(
context, input, cors_mode, /* allow_none = */ false,
/* only_url = */ false,
context, input, cors_mode,
flags | ParseImageFlags::FORBID_NONE
)
}) {
return Ok(Self::Image(image));
@ -374,7 +383,7 @@ impl ImageSet {
context: &ParserContext,
input: &mut Parser<'i, 't>,
cors_mode: CorsMode,
only_url: bool,
flags: ParseImageFlags
) -> Result<Self, ParseError<'i>> {
let function = input.expect_function()?;
match_ignore_ascii_case! { &function,
@ -386,7 +395,7 @@ impl ImageSet {
}
let items = input.parse_nested_block(|input| {
input.parse_comma_separated(|input| {
ImageSetItem::parse(context, input, cors_mode, only_url)
ImageSetItem::parse(context, input, cors_mode, flags)
})
})?;
Ok(Self {
@ -406,7 +415,7 @@ impl ImageSetItem {
context: &ParserContext,
input: &mut Parser<'i, 't>,
cors_mode: CorsMode,
only_url: bool,
flags: ParseImageFlags
) -> Result<Self, ParseError<'i>> {
let image = match input.try_parse(|i| i.expect_url_or_string()) {
Ok(url) => Image::Url(SpecifiedImageUrl::parse_from_string(
@ -415,8 +424,8 @@ impl ImageSetItem {
cors_mode,
)),
Err(..) => Image::parse_with_cors_mode(
context, input, cors_mode, /* allow_none = */ false,
/* only_url = */ only_url,
context, input, cors_mode,
flags | ParseImageFlags::FORBID_NONE | ParseImageFlags::FORBID_IMAGE_SET
)?,
};