080d16cabf
Summary:
X-link: https://github.com/facebook/react-native/pull/37179
Pull Request resolved: https://github.com/facebook/yoga/pull/1273
1. Simplify nan handling a bit
2. Remove string literal operators which seem dead enough to remove. These are public, so anyone could be using them, but it seems like almost nobody is.
1. FB has no usages of `using namespace facebook::yoga::literals` (exposing the literal operators) outside of Yoga tests.
1. There is only [a single usage](6dfba905ea/SDLTest/UIKit.hpp (L19)) on GitHub.
Reviewed By: yungsters
Differential Revision: D45419970
fbshipit-source-id: 8121303e5ae66596132a848a711802081728f4fb
Yoga 
Yoga is an embeddable and performant flexbox layout engine with bindings for multiple languages.
Building
Yoga's main implementation targets C++ 14 with accompanying build logic in CMake. A wrapper is provided to build the main library and run unit tests.
./unit_tests <Debug|Release>
While not required, this script will use ninja if it is installed for faster builds.
Yoga is additionally part of the vcpkg collection of ports maintained by Microsoft and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.
Adding Tests
Many of Yoga's tests are automatically generated, using HTML fixtures describing node structure. These are rendered in Chrome to generate an expected layout result for the tree. New fixtures can be added to gentest/fixtures.
<div id="my_test" style="width: 100px; height: 100px; align-items: center;">
<div style="width: 50px; height: 50px;"></div>
</div>
To generate new tests from added fixtures:
- Run
bundle installin thegentestdirectory to install dependencies of the test generator. - Run
ruby gentest.rbin thegentestdirectory.
Debugging
Yoga provides a VSCode "launch.json" configuration which allows debugging unit tests. Simply add your breakpoints, and run "Debug C++ Unit tests (lldb)" (or "Debug C++ Unit tests (vsdbg)" on Windows).