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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** |
| 6 | * This file is part of fast-forward/dev-tools. |
| 7 | * |
| 8 | * This source file is subject to the license bundled |
| 9 | * with this source code in the file LICENSE. |
| 10 | * |
| 11 | * @copyright Copyright (c) 2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com> |
| 12 | * @license https://opensource.org/licenses/MIT MIT License |
| 13 | * |
| 14 | * @see https://github.com/php-fast-forward/dev-tools |
| 15 | * @see https://github.com/php-fast-forward |
| 16 | * @see https://datatracker.ietf.org/doc/html/rfc2119 |
| 17 | */ |
| 18 | |
| 19 | namespace FastForward\DevTools\GitAttributes; |
| 20 | |
| 21 | use Symfony\Component\Filesystem\Filesystem; |
| 22 | |
| 23 | use function Safe\preg_split; |
| 24 | |
| 25 | /** |
| 26 | * Persists normalized .gitattributes content. |
| 27 | * |
| 28 | * This writer SHALL align attribute declarations using the longest path spec, |
| 29 | * write the provided textual content to the target path, and MUST append a |
| 30 | * final trailing line feed for deterministic formatting. |
| 31 | */ |
| 32 | class Writer implements WriterInterface |
| 33 | { |
| 34 | /** |
| 35 | * @param Filesystem $filesystem the filesystem service responsible for writing the file |
| 36 | */ |
| 37 | public function __construct( |
| 38 | private Filesystem $filesystem |
| 39 | ) {} |
| 40 | |
| 41 | /** |
| 42 | * Writes the .gitattributes content to the specified filesystem path. |
| 43 | * |
| 44 | * @param string $gitattributesPath The filesystem path to the .gitattributes file. |
| 45 | * @param string $content The merged .gitattributes content to persist. |
| 46 | * |
| 47 | * @return void |
| 48 | */ |
| 49 | public function write(string $gitattributesPath, string $content): void |
| 50 | { |
| 51 | $this->filesystem->dumpFile($gitattributesPath, $this->format($content)); |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Formats .gitattributes content with aligned attribute columns. |
| 56 | * |
| 57 | * @param string $content The merged .gitattributes content to normalize. |
| 58 | * |
| 59 | * @return string |
| 60 | */ |
| 61 | private function format(string $content): string |
| 62 | { |
| 63 | $rows = []; |
| 64 | $maxPathSpecLength = 0; |
| 65 | |
| 66 | foreach (preg_split('/\R/', $content) ?: [] as $line) { |
| 67 | $trimmedLine = trim((string) $line); |
| 68 | |
| 69 | if ('' === $trimmedLine) { |
| 70 | $rows[] = [ |
| 71 | 'type' => 'raw', |
| 72 | 'line' => '', |
| 73 | ]; |
| 74 | |
| 75 | continue; |
| 76 | } |
| 77 | |
| 78 | if (str_starts_with($trimmedLine, '#')) { |
| 79 | $rows[] = [ |
| 80 | 'type' => 'raw', |
| 81 | 'line' => $trimmedLine, |
| 82 | ]; |
| 83 | |
| 84 | continue; |
| 85 | } |
| 86 | |
| 87 | $entry = $this->parseEntry($trimmedLine); |
| 88 | |
| 89 | if (null === $entry) { |
| 90 | $rows[] = [ |
| 91 | 'type' => 'raw', |
| 92 | 'line' => $trimmedLine, |
| 93 | ]; |
| 94 | |
| 95 | continue; |
| 96 | } |
| 97 | |
| 98 | $maxPathSpecLength = max($maxPathSpecLength, \strlen($entry['path_spec'])); |
| 99 | $rows[] = [ |
| 100 | 'type' => 'entry', |
| 101 | 'path_spec' => $entry['path_spec'], |
| 102 | 'attributes' => $entry['attributes'], |
| 103 | ]; |
| 104 | } |
| 105 | |
| 106 | $formattedLines = []; |
| 107 | |
| 108 | foreach ($rows as $row) { |
| 109 | if ('entry' !== $row['type']) { |
| 110 | $formattedLines[] = $row['line']; |
| 111 | |
| 112 | continue; |
| 113 | } |
| 114 | |
| 115 | $formattedLines[] = str_pad($row['path_spec'], $maxPathSpecLength + 1) . $row['attributes']; |
| 116 | } |
| 117 | |
| 118 | return implode("\n", $formattedLines) . "\n"; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Parses a .gitattributes entry into its path spec and attribute segment. |
| 123 | * |
| 124 | * @param string $line The normalized .gitattributes line. |
| 125 | * |
| 126 | * @return array{path_spec: string, attributes: string}|null |
| 127 | */ |
| 128 | private function parseEntry(string $line): ?array |
| 129 | { |
| 130 | $separatorPosition = $this->firstUnescapedWhitespacePosition($line); |
| 131 | |
| 132 | if (null === $separatorPosition) { |
| 133 | return null; |
| 134 | } |
| 135 | |
| 136 | $pathSpec = substr($line, 0, $separatorPosition); |
| 137 | $attributes = ltrim(substr($line, $separatorPosition)); |
| 138 | |
| 139 | if ('' === $pathSpec || '' === $attributes) { |
| 140 | return null; |
| 141 | } |
| 142 | |
| 143 | return [ |
| 144 | 'path_spec' => $pathSpec, |
| 145 | 'attributes' => $attributes, |
| 146 | ]; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Locates the first non-escaped whitespace separator in a line. |
| 151 | * |
| 152 | * @param string $line the line to inspect |
| 153 | * |
| 154 | * @return int|null |
| 155 | */ |
| 156 | private function firstUnescapedWhitespacePosition(string $line): ?int |
| 157 | { |
| 158 | $length = \strlen($line); |
| 159 | |
| 160 | for ($position = 0; $position < $length; ++$position) { |
| 161 | if (! \in_array($line[$position], [' ', "\t"], true)) { |
| 162 | continue; |
| 163 | } |
| 164 | |
| 165 | $backslashCount = 0; |
| 166 | |
| 167 | for ($index = $position - 1; $index >= 0 && '\\' === $line[$index]; --$index) { |
| 168 | ++$backslashCount; |
| 169 | } |
| 170 | |
| 171 | if (0 === $backslashCount % 2) { |
| 172 | return $position; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | return null; |
| 177 | } |
| 178 | } |