xref: /PHP-Parser/grammar/rebuildParsers.php (revision 3c3bcd31) 
1<?php declare(strict_types=1);
2
3require __DIR__ . '/phpyLang.php';
4
5$parserToDefines = [
6    'Php7' => ['PHP7' => true],
7    'Php8' => ['PHP8' => true],
8];
9
10$grammarFile    = __DIR__ . '/php.y';
11$skeletonFile   = __DIR__ . '/parser.template';
12$tmpGrammarFile = __DIR__ . '/tmp_parser.phpy';
13$tmpResultFile  = __DIR__ . '/tmp_parser.php';
14$resultDir = __DIR__ . '/../lib/PhpParser/Parser';
15
16$kmyacc = getenv('KMYACC');
17if (!$kmyacc) {
18    // Use phpyacc from dev dependencies by default.
19    $kmyacc = __DIR__ . '/../vendor/bin/phpyacc';
20}
21
22$options = array_flip($argv);
23$optionDebug = isset($options['--debug']);
24$optionKeepTmpGrammar = isset($options['--keep-tmp-grammar']);
25
26///////////////////
27/// Main script ///
28///////////////////
29
30foreach ($parserToDefines as $name => $defines) {
31    echo "Building temporary $name grammar file.\n";
32
33    $grammarCode = file_get_contents($grammarFile);
34    $grammarCode = replaceIfBlocks($grammarCode, $defines);
35    $grammarCode = preprocessGrammar($grammarCode);
36
37    file_put_contents($tmpGrammarFile, $grammarCode);
38
39    $additionalArgs = $optionDebug ? '-t -v' : '';
40
41    echo "Building $name parser.\n";
42    $output = execCmd("$kmyacc $additionalArgs -m $skeletonFile -p $name $tmpGrammarFile");
43
44    $resultCode = file_get_contents($tmpResultFile);
45    $resultCode = removeTrailingWhitespace($resultCode);
46
47    ensureDirExists($resultDir);
48    file_put_contents("$resultDir/$name.php", $resultCode);
49    unlink($tmpResultFile);
50
51    if (!$optionKeepTmpGrammar) {
52        unlink($tmpGrammarFile);
53    }
54}
55
56////////////////////////////////
57/// Utility helper functions ///
58////////////////////////////////
59
60function ensureDirExists($dir) {
61    if (!is_dir($dir)) {
62        mkdir($dir, 0777, true);
63    }
64}
65
66function execCmd($cmd) {
67    $output = trim(shell_exec("$cmd 2>&1") ?? '');
68    if ($output !== "") {
69        echo "> " . $cmd . "\n";
70        echo $output;
71    }
72    return $output;
73}
74
75function replaceIfBlocks(string $code, array $defines): string {
76    return preg_replace_callback('/\n#if\s+(\w+)\n(.*?)\n#endif/s', function ($matches) use ($defines) {
77        $value = $defines[$matches[1]] ?? false;
78        return $value ? $matches[2] : '';
79    }, $code);
80}
81