Represent CoverageData in objects

[staabm]

thesis is, that we need less memory when processing big projects

in phpstan-src I can see the coverage producing test-runs to consume ~3GB of data.
my gut feeling is, that if we would consume less data we would automatically get faster, because we need less memory allocations

---

running phpstan-src@8f9490ecc6

before this PR (37047b5):

➜  phpstan-src git:(2.1.x) ✗ XDEBUG_MODE=coverage php vendor/bin/phpunit --coverage-xml=tmp/coverage-xml tests/PHPStan/Type/Constant --path-coverage
PHPUnit 12.4.2 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.27 with Xdebug 3.4.7
Configuration: /Users/staabm/workspace/phpstan-src/phpunit.xml

...............................................................  63 / 128 ( 49%)
............................................................... 126 / 128 ( 98%)
..                                                              128 / 128 (100%)

Time: 01:18.247, Memory: 1.18 GB

OK (128 tests, 209 assertions)

Generating code coverage report in PHPUnit XML format ... done [00:05.877]

with this PR (1b73b3c)

➜  phpstan-src git:(2.1.x) ✗ XDEBUG_MODE=coverage php vendor/bin/phpunit --coverage-xml=tmp/coverage-xml tests/PHPStan/Type/Constant --path-coverage
PHPUnit 12.4.2 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.27 with Xdebug 3.4.7
Configuration: /Users/staabm/workspace/phpstan-src/phpunit.xml

...............................................................  63 / 128 ( 49%)
............................................................... 126 / 128 ( 98%)
..                                                              128 / 128 (100%)

Time: 00:53.183, Memory: 1.18 GB

OK (128 tests, 209 assertions)

Generating code coverage report in PHPUnit XML format ... done [00:05.709]

[sebastianbergmann]

Is the only reason you're still considering this a draft/proof of concept because the tests need updating?

[staabm]

draft/proof of concept because the tests need updating?

yes

[codecov]

Codecov Report

❌ Patch coverage is 88.80000% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.98%. Comparing base (37047b5) to head (43206aa).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/Node/File.php	60.00%	8 Missing ⚠️
src/Report/Html/Renderer/File.php	78.26%	5 Missing ⚠️
src/Data/ProcessedFunctionCoverageData.php	97.14%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1105      +/-   ##
============================================
+ Coverage     88.82%   88.98%   +0.15%     
- Complexity     1391     1408      +17     
============================================
  Files            98      101       +3     
  Lines          4655     4712      +57     
============================================
+ Hits           4135     4193      +58     
+ Misses          520      519       -1     

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[staabm]

tested a different case on the phpstan-src codebase:

running phpstan-src@8f9490ecc6

before this PR (37047b5):

➜  phpstan-src git:(2.1.x) ✗ XDEBUG_MODE=coverage php vendor/bin/phpunit --coverage-xml=tmp/coverage-xml tests/PHPStan/Reflection/Annotations --path-coverage
PHPUnit 12.4.2 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.27 with Xdebug 3.4.7
Configuration: /Users/staabm/workspace/phpstan-src/phpunit.xml

......................................S^[[C..S...............         57 / 57 (100%)

Time: 06:09.856, Memory: 1.23 GB

OK, but some tests were skipped!
Tests: 57, Assertions: 1985, Skipped: 2.

Generating code coverage report in PHPUnit XML format ... done [00:05.955]

with this PR (3e53a48)

➜  phpstan-src git:(2.1.x) ✗ XDEBUG_MODE=coverage php vendor/bin/phpunit --coverage-xml=tmp/coverage-xml tests/PHPStan/Reflection/Annotations --path-coverage
PHPUnit 12.4.2 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.3.27 with Xdebug 3.4.7
Configuration: /Users/staabm/workspace/phpstan-src/phpunit.xml

......................................S..S...............         57 / 57 (100%)

Time: 03:58.814, Memory: 1.31 GB

OK, but some tests were skipped!
Tests: 57, Assertions: 1985, Skipped: 2.

Generating code coverage report in PHPUnit XML format ... done [00:05.869]

[staabm]

After a few more tests, I think the optimization is only substantial when phpunit is invoked with --path-coverage

[staabm]

I think we can achieve similar things for regular line-coverage.. will prepare a separate PR