style: Do not immediately convert absolute specified lengths
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This PR aims to solve issue #15729. I tried to follow the recommendations there as much as possible.
This is my first attempt at contributing to Servo, so this will probably need a lot of input, although I'm eager to make it as polished as possible.
- The base inaccuracy issue seems solved, as can be easily verified with the `console.log` based example in the issue.
- Very basic unit tests were added.
I have doubts mainly about the right way to represent these new enum variants for the various length units:
1. With new enum variants in `NoCalcLength` *and* newtypes (current solution)
2. With a `NoCalcLength::Absolute` variant that contains a new `AbsoluteLength` enum, but without newtypes
3. Same as solution 2 but with newtypes
- I mostly cared about unit tests until now but will investigate other types of tests
- Tests to check the clamping
- Write a proper commit message
Thanks for your time and feedback :)
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The NoCalcLength::Absolute variant has been rewritten to accommodate
other units than Au with the new AbsoluteLength enum. This avoids loss
of precision for some operations.
The conversion from floating point absolute lengths to integer
application unit values adopts the same clamping limits as Gecko.
Parse perspective property as non negative and add tests
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Implement an ExtremumLength type which contains all the enumerated
keyword values for min-width, min-height, max-width, and
max-height. Then, implement a MinLength which can be used for min-width
and min-height. So far this just maps to Gecko values.
Refs #13821.
Signed-off-by: Sam <sam@sam.uk.net>
Use existing parse functions for any length parsing of letter-spacing and word-spacing.
Signed-off-by: Sam <sam@sam.uk.net>
Add letter-spacing test
Signed-off-by: Sam <sam@sam.uk.net>
Add tests for letter-spacing and word-spacing negative parsing.
Signed-off-by: Sam <sam@sam.uk.net>
Remove extra line.
Signed-off-by: Sam <sam@sam.uk.net>
Remove _ of _context.
Signed-off-by: Sam <sam@sam.uk.net>
Refactor tests to use new NoCalcLength
Signed-off-by: Sam <sam@sam.uk.net>
Remove unused import.
Signed-off-by: Sam <sam@sam.uk.net>
Remove un-needed use.
This introduces a basic framework for servo's style system to be able
to query the style of presentation attributes which it can then insert
into the cascade. It uses that framework to implement the size and
color attributes on <font>.
There are a number of improvements that can be done on top of this:
- Implement all other properties
- Abstractify the ruledata parameter of the mappers using templates or virtual dispatch so that it can be a Servo decl block instead
- Implement aforementiond abstraction over Servo decl blocks (this obsoletes the code in the first item above, so it might just be better to skip that and directly do this)
- Replace uses of nsHTMLStyleSheet with an abstract base class containing common elements between Servo and Gecko
I'd prefer for these to be done in separate steps.
Parsing "0" as Number for line-height and border-image-outset
Fixes#15171 by correctly parsing `0` as `0` (rather than as `0px`, as was the case earlier) for the `line-height` and `border-image-outset` CSS properties. Wrote unit tests for both; `./mach test-unit -p style` passes all tests.
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Use Box<CalcLengthOrPercentage> in specified values to avoid bloating inline sizes
For #15061
CalcLOP is a large struct, and gets used quite often. While #15063 reduces its size a bit,
it will still be much larger than any of the other variants in the `specified::Length*` types,
so it will still bloat sizes, especially for specified values that contain many lengths.
This change boxes it in the length types, so that it just takes one word.
r? @heycam
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Treat top-level number in calc() invalid
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This should probably considered as a temporary fix (for [bug 1321206](https://bugzilla.mozilla.org/show_bug.cgi?id=1321206)), to avoid assertion when trying to serialize calc value with only numbers. Certain properties (e.g. `line-height`) would eventually need to keep numbers inside calc.
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Currently, CalcLengthOrPercentage doesn't actually keep the number value. If we don't treat it invalid, we can end up generating empty `calc()` value when one contains numbers (e.g. `calc(1)`), which would violate assertion elsewhere that `calc` must not be empty.
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Currently, CalcLengthOrPercentage doesn't actually keep the number
value, so if we don't treat it invalid, we can end up generating empty
`calc()` value when one contains top-level numbers (e.g. `calc(1)`),
which would violate assertion elsewhere that `calc` must not be empty.
Only allow border-image-outset to use non-negative numbers.
Restricts border-image-outline to only allow positive values.
Fixes#14295
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