style: Derive more length stuff, and shrink MaxLength / MozLength's repr(C) representation.

This patch:

 * Makes LengthPercentageOrAuto generic, and removes a bunch of code fo
   LengthPercentageOrNone, which was used only for servo and now can use the
   normal MaxLength (with a cfg() guard for the ExtremumLength variant).

 * Shrinks MaxLength / MozLength's repr(C) reperesentation by reducing enum
   nesting. The shrinking is in preparation for using them from C++ too, though
   that'd be a different bug.

 * Moves NonNegative usage to the proper places so that stuff for them can be
   derived.

I did this on top of bug 1523071 to prove both that it could be possible and
that stuff wasn't too messy. It got a bit messy, but just because of a bug I
had fixed in bindgen long time ago already, so this updates bindgen's patch
version to grab a fix instead of ugly workarounds :)

Differential Revision: https://phabricator.services.mozilla.com/D17762
This commit is contained in:
Emilio Cobos Álvarez 2019-01-27 01:03:44 +01:00
parent 8dad956513
commit a68bc29b96
17 changed files with 337 additions and 520 deletions

View file

@ -59,7 +59,7 @@ pub use self::image::{GradientItem, GradientKind, Image, ImageLayer, MozImageRec
pub use self::length::{AbsoluteLength, CalcLengthPercentage, CharacterWidth};
pub use self::length::{FontRelativeLength, Length, LengthOrNumber};
pub use self::length::{LengthPercentage, LengthPercentageOrAuto};
pub use self::length::{LengthPercentageOrNone, MaxLength, MozLength};
pub use self::length::{MaxLength, MozLength};
pub use self::length::{NoCalcLength, ViewportPercentageLength};
pub use self::length::{NonNegativeLengthPercentage, NonNegativeLengthPercentageOrAuto};
#[cfg(feature = "gecko")]