Bug 299972 – [Style] Replace isZero/isNegative/isPositive functions inherited from WebCore::Length

• Component: CSS
• Status: RESOLVED FIXED

[Sam Weinig]

StyleLengthPercentage<> and Style::LengthWrapperBase<> inherited (to help things continue to work without too much churn) the isZero/isNegative/isPositive functions and along with them their quirky behavior with calc and keywords.

For a type that includes a Length, Percentage, Calc, and Keywords, the functions have the following behavior:

isZero:
- Length (compare value, makes sense)
- Percentage (compare value, makes sense)
- Calc (always FALSE)
- Keyword (always TRUE, due to keywords having a value of 0).

isPositive:
- Length (compare value, makes sense)
- Percentage (compare value, makes sense)
- Calc (always TRUE)
- Keyword (always FALSE, due to keywords having a value of 0).

isNegative:
- Length (compare value, makes sense)
- Percentage (compare value, makes sense)
- Calc (always FALSE)
- Keyword (always FALSE, due to keywords having a value of 0).

We should remove them, and, if necessary, replace them with more accurately named functions.

[Sam Weinig]

Pull request: https://github.com/WebKit/WebKit/pull/51635

[EWS]

Committed 300911@main (33b130ec17ce): <https://commits.webkit.org/300911@main>

Reviewed commits have been landed. Closing PR #51635 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/161861437>

[Diego Pino]

This change broke WPEWebKit/WebKitGTK builds with GCC12. The build error is:

https://build.webkit.org/#/builders/46/builds/55581

```
/home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/StyleLengthWrapper.h:146:67: error: invalid use of non-static data member ‘WebCore::Style::PrimitiveNumeric<WebCore::CSS::Percentage<WebCore::CSS::Range{0.0, +Inf, WebCore::CSS::RangeClampOptions::Default, WebCore::CSS::RangeZoomOptions::Default}, float> >::value’
  146 |         else if (opaqueType == indexForPercentage)  return visitor(Percentage { m_value.value() });
      |                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/StylePrimitiveNumericTypes.h:28,
                 from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/CSSColorDescriptors.h:35,
                 from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/CSSColor.h:29,
                 from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/CSSGradient.h:29,
                 from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/CSSCircleFunction.h:27,
                 from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/CSSBasicShape.h:27,
                 from /home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/StyleBasicShape.h:27:
/home/buildbot/worker/GTK-Linux-64-bit-Release-Debian-12-Build/build/WebKitBuild/GTK/Release/WebCore/PrivateHeaders/WebCore/StylePrimitiveNumeric.h:60:23: note: declared here
   60 |     ResolvedValueType value { 0 };
```

[Diego Pino]

Re-opening for pull request https://github.com/WebKit/WebKit/pull/51934

[EWS]

Committed 301265@main (0e023c832420): <https://commits.webkit.org/301265@main>

Reviewed commits have been landed. Closing PR #51934 and removing active labels.

[Simon Fraser (smfr)]

This caused bug 301873.