Immutable CSSOM
This PR is intended to add basic support for all CSSOM interfaces, with the ability to index `document.styleSheets` and css rule lists, and serializing individual css rules. Handling individual interface methods for CSSRule subclasses can probably be done with easy/medium bugs.
Mutation safety isn't dealt with here; if the css rule list is mutated the CSSOM will be in an inconsistent state. I intend to deal with this via zero sized tokens, see https://groups.google.com/forum/#!topic/mozilla.dev.servo/AnxJoVmtMXQ . I'll handle that when I start making the CSSOM mutable. (Getting the immutable bit landed first opens this up for easy bugs)
This doesn't really change style aside from adding an extra arc in the CSS rule list as discussed in the linked thread. So far this same design can be used by stylo as well when the time comes.
f? @SimonSapin @emilio
cc @upsuper
part of #11420
Todo:
- [x] Stubs for rest of the CSSRule subclasses
- [x] <s>ToCSS impls for CSSRules.</s> May make into easy bugs and stub out in this PR https://github.com/servo/servo/issues/14195
- [x] Cache CSSStyleSheet on the relevant node
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Added parsing/serialization for text-emphasis-position
Implemented parsing/serialization for text-emphasis-position
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Implement border-image shorthand
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Implementation of border-image shorthand.
r? Manishearth
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Update CSSRule naming from 'CSSRule' to 'CssRule'
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Update CSSRule naming from 'CSSRule' to 'CssRule'
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Adds scroll-snap-type shorthand property
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Follow up to #14017
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And make empty list the default value of MediaList.
This commit also removes Option wrapper of Stylesheet.media because
a stylesheet should always have an associated media query list.
This patch introduces infrastructure for the rule tree, and constructs it.
We don't use it yet, nor have good heuristics for GC'ing it, but this should not
happen anymore once we store the rule node reference in the node.
I haven't messed up with memory orders because I want to do a try run with it,
then mess with them.
Take down the ApplicableDeclarationsCache, use the rule tree for doing the cascade.
Implement matchMedia and MediaQueryList
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Fixes#13376.
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Make test-tidy check for alphabetical ordering of #![feature(...)] statements
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Adds parsing test for linear-gradient
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Tests if `linear-gradient` is correctly parsed without `<side-or-corner>` as well as with `to left` and `to right`.
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Use enum BorderWidth as SpecifiedValue
Use enum BorderWidth instead of a tuple-like struct to store the specified
value. BorderWidth is needed to be used in both longhand and shorthand
border width properties, so I put it in `specified` module.
Fixed#13869.
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Implement parsing for font-language-override property
Implement and test parsing of the `font-language-override` style property.
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13894 Use graphenes in text-emphasis-style
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Use `unicode_segmentation` crate to truncate strings on grapheme boundaries.
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Font feature settings
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Implement parsing/serialization for font-feature-settings
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Use enum BorderWidth instead of a tuple-like struct to store the specified
value. BorderWidth is needed to be used in both longhand and shorthand
border width properties, so I put it in `specified` module.
Fixed#13869.
Implement parsing/serialization and gecko glue for text-emphasis-style
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Implementation of parsing/serialization and gecko glue for text-emphasis-style.
r? @Manishearth
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Fix radial gradient's <size>/<ending-shape> parsing
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Parsing now handles sizes and shapes in various order.
I had to delete `EndingShape`'s parse implementation and mix it with `Position` in `parse_radial`. It became a bit complicated to read but I couldn't make it simpler.
r? @Manishearth
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