By using a look ahead assertion to match "new line - maybe whitespace - marker", the negative performance impact of the `.*` is significantly mitigated and backtracing will be severely limited.
This fixes the bug as reported in 10037.
The bug was discovered due to a PHP 8.1 "passing null to non-nullable" deprecation notice being thrown, but is not a PHP 8.1 bug.
In actual fact, this issue affected all PHP versions and could lead to incomplete classmaps when the code base contained files with huge heredocs/nowdocs.
The regex change (not completely) incidentally also fixes an issue with markers in a heredoc/nowdoc not being correctly handled. This bug could lead to "classes" being added to the class map which aren't actually classes.
Fixes 10037
PHP 8.1 supports Enums, and [Enums follow class-semantics](https://php.watch/versions/8.1/enums#class-semantics-autoload).
Composer's class-map generator currently looks for `class`, `interface`, and `trait` keywords. If Composer is run in PHP 8.1 or later, Composer now additionally looks for `enum` keyword as well. This is similar to how Hack's `enum` support is added.
This PR also adds tests for basic enums, backed enums, namespaced enums, and an enum that implements an interface and extends a class.
# By Jordi Boggiano (30) and others
# Via Jordi Boggiano (37) and Morgan Campbell (1)
* 'master' of https://github.com/composer/composer: (83 commits)
Update 01-basic-usage.md
Revert 331425bcb3 as well, fixes#3612
Revert "Disable overwrites when no-ansi is present, fixes #3612"
Update deps
Use justinrainbow/json-schema 1.4
Improved wording
Fix docs basic-auth => http-basic
Add test for Generics class
Single variable for traits and enums
Use HHVM_VERSION instead of HPHP_VERSION
Add support for using classmap to autoload Hack enums
Re-use existing autoloader suffix if available, fixes#3701
Report Travis CI build success early
Test on HHVM nightly releases. Allow to fail.
Make parseJson safer
Use get home from Config instead of factory
Fix env override regression, fixes#3820
[create-project] Used no progress value for dependencies
Add docBlock and fix CS
Fix output of first line of progress when output is not decorated, refs #3818
...
fixescomposer/composer#3823
Ran tests with both PHP5.5.9-1ubuntu4.5 and HHVM 3.6. Test fails on HHVM only
if I back out the ClassMapGenerator.php change.
jrfnl