Drop DOM dependency

[staabm]

requires theseer/tokenizer#38

before this PR (using PHPUnit 12.4.4)

➜  slow-coverage-xml1 git:(main) ✗ hyperfine 'php coverage-xml.php'           
Benchmark 1: php coverage-xml.php
  Time (mean ± σ):     11.772 s ±  0.550 s    [User: 10.209 s, System: 1.237 s]
  Range (min … max):   11.008 s … 12.568 s    10 runs

after this PR:

➜  slow-coverage-xml1 git:(main) ✗ hyperfine 'php coverage-xml.php'
Benchmark 1: php coverage-xml.php
  Time (mean ± σ):      5.999 s ±  0.385 s    [User: 5.008 s, System: 0.789 s]
  Range (min … max):    5.647 s …  6.732 s    10 runs

---

env

php -v
PHP 8.3.28 (cli) (built: Nov 18 2025 22:17:16) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.28, Copyright (c) Zend Technologies

[staabm]

double check against phpstan-src@05b80ef861 on my macos m4 pro laptop

before this PR (using PHPUnit 12.4.4)

Generating code coverage report in PHPUnit XML format ... done [00:31.317]

after this PR

Generating code coverage report in PHPUnit XML format ... done [00:17.598]

[sebastianbergmann]

Does Infection need the <source> element? If not, we could speed up the XML report generation even more for that use case:

❯ git diff
src/Report/Xml/Facade.php --- 1/2 --- PHP
45        public const string XML_NAMESPACE = 'https://schema.phpunit.de/coverage/1.0';
46        private string $target;
47        private Project $project;
48        private readonly string $phpUnitVersion;
50        public function __construct(string $version)
   49     private readonly bool $includeSource;
   51     public function __construct(string $version, bool $includeSource = true)
   54         $this->includeSource  = $includeSource;
   55     }
   56
   57     /**
   58      * @throws XmlException

src/Report/Xml/Facade.php --- 2/2 --- PHP
169                $coverage = $fileReport->lineCoverage((string) $line);
170                $coverage->finalize($tests);
171            }
   175         if ($this->includeSource) {
   179         }
   180
   181         $this->saveDocument($fileReport->asDom(), $file->id());
   182     }
   183

Of course, we would need to expose this as a configuration option. This is just an idea so far.