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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Hyde\Framework\Actions; |
| 6 | |
| 7 | use RuntimeException; |
| 8 | use Hyde\Facades\Filesystem; |
| 9 | |
| 10 | use function str_ends_with; |
| 11 | use function str_starts_with; |
| 12 | use function substr_count; |
| 13 | use function json_decode; |
| 14 | use function explode; |
| 15 | use function strlen; |
| 16 | use function strpos; |
| 17 | use function substr; |
| 18 | use function trim; |
| 19 | |
| 20 | /** |
| 21 | * @experimental Parse the front matter in a Blade file. |
| 22 | * |
| 23 | * Accepts a string to make it easier to mock when testing. |
| 24 | * |
| 25 | * @phpstan-consistent-constructor |
| 26 | * |
| 27 | * === DOCUMENTATION (draft) === |
| 28 | * |
| 29 | * ## Front Matter in Markdown |
| 30 | * |
| 31 | * HydePHP uses a special syntax called BladeMatter that allows you to define variables in a Blade file, |
| 32 | * and have Hyde statically parse them into the front matter of the page model. This allows metadata |
| 33 | * in your Blade pages to be used when Hyde generates dynamic data like page titles and SEO tags. |
| 34 | * |
| 35 | * ### Syntax |
| 36 | * |
| 37 | * Any line following the syntax below will be added to the parsed page object's front matter. |
| 38 | * |
| 39 | * @example `@php($title = 'BladeMatter Test')` |
| 40 | * This would then be parsed into the following array in the page model: ['title' => 'BladeMatter Test'] |
| 41 | * |
| 42 | * ### Limitations |
| 43 | * Each directive must be on its own line, and start with `@php($.`. Arrays are currently not supported. |
| 44 | */ |
| 45 | class BladeMatterParser |
| 46 | { |
| 47 | protected string $contents; |
| 48 | protected array $matter; |
| 49 | |
| 50 | /** @var string The directive signature used to determine if a line should be parsed. */ |
| 51 | protected const SEARCH = '@php($'; |
| 52 | |
| 53 | public static function parseFile(string $path): array |
| 54 | { |
| 55 | return static::parseString(Filesystem::getContents($path)); |
| 56 | } |
| 57 | |
| 58 | public static function parseString(string $contents): array |
| 59 | { |
| 60 | return (new static($contents))->parse()->get(); |
| 61 | } |
| 62 | |
| 63 | public function __construct(string $contents) |
| 64 | { |
| 65 | $this->contents = $contents; |
| 66 | } |
| 67 | |
| 68 | public function get(): array |
| 69 | { |
| 70 | return $this->matter; |
| 71 | } |
| 72 | |
| 73 | public function parse(): static |
| 74 | { |
| 75 | $this->matter = []; |
| 76 | |
| 77 | $lines = explode("\n", $this->contents); |
| 78 | |
| 79 | foreach ($lines as $line) { |
| 80 | if (static::lineMatchesFrontMatter($line)) { |
| 81 | $this->matter[static::extractKey($line)] = static::getValueWithType(static::extractValue($line)); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | return $this; |
| 86 | } |
| 87 | |
| 88 | protected static function lineMatchesFrontMatter(string $line): bool |
| 89 | { |
| 90 | return str_starts_with($line, static::SEARCH); |
| 91 | } |
| 92 | |
| 93 | protected static function extractKey(string $line): string |
| 94 | { |
| 95 | // Remove search prefix |
| 96 | $key = substr($line, strlen(static::SEARCH)); |
| 97 | |
| 98 | // Remove everything after the first equals sign |
| 99 | $key = substr($key, 0, strpos($key, '=')); |
| 100 | |
| 101 | // Return trimmed line |
| 102 | return trim($key); |
| 103 | } |
| 104 | |
| 105 | protected static function extractValue(string $line): string |
| 106 | { |
| 107 | // Trim any trailing spaces and newlines |
| 108 | $key = trim($line); |
| 109 | |
| 110 | // Remove everything before the first equals sign |
| 111 | $key = substr($key, strpos($key, '=') + 1); |
| 112 | |
| 113 | // Remove closing parenthesis |
| 114 | $key = substr($key, 0, strlen($key) - 1); |
| 115 | |
| 116 | // Remove any quotes so we can normalize the value |
| 117 | $key = trim($key, ' "\''); |
| 118 | |
| 119 | // Return trimmed line |
| 120 | return trim($key); |
| 121 | } |
| 122 | |
| 123 | /** @return scalar|array<string, scalar> */ |
| 124 | protected static function getValueWithType(string $value): mixed |
| 125 | { |
| 126 | $value = trim($value); |
| 127 | |
| 128 | if ($value === 'null') { |
| 129 | return null; |
| 130 | } |
| 131 | |
| 132 | if (static::isValueArrayString($value)) { |
| 133 | return static::parseArrayString($value); |
| 134 | } |
| 135 | |
| 136 | // This will cast integers, floats, and booleans to their respective types |
| 137 | // Still working on a way to handle multidimensional arrays and objects |
| 138 | |
| 139 | /** @var scalar|null $decoded */ |
| 140 | $decoded = json_decode($value); |
| 141 | |
| 142 | return $decoded ?? $value; |
| 143 | } |
| 144 | |
| 145 | /** @return array<string, scalar> */ |
| 146 | protected static function parseArrayString(string $string): array |
| 147 | { |
| 148 | $array = []; |
| 149 | |
| 150 | // Trim input string |
| 151 | $string = trim($string); |
| 152 | |
| 153 | // Check if string is an array |
| 154 | if (! static::isValueArrayString($string)) { |
| 155 | throw new RuntimeException('Failed parsing BladeMatter array. Input string must follow array syntax.'); |
| 156 | } |
| 157 | |
| 158 | // Check if string is multidimensional (not yet supported) |
| 159 | if ((substr_count($string, '[') > 1) || (substr_count($string, ']') > 1)) { |
| 160 | throw new RuntimeException('Failed parsing BladeMatter array. Multidimensional arrays are not supported yet.'); |
| 161 | } |
| 162 | |
| 163 | // Remove opening and closing brackets |
| 164 | $string = substr($string, 1, strlen($string) - 2); |
| 165 | |
| 166 | // Tokenize string between commas |
| 167 | $tokens = explode(',', $string); |
| 168 | |
| 169 | // Parse each token |
| 170 | foreach ($tokens as $token) { |
| 171 | // Split string into key/value pairs |
| 172 | $pair = explode('=>', $token); |
| 173 | |
| 174 | // Add key/value pair to array |
| 175 | $key = (string) static::getValueWithType(trim(trim($pair[0]), "'")); |
| 176 | $value = static::getValueWithType(trim(trim($pair[1]), "'")); |
| 177 | |
| 178 | $array[$key] = $value; |
| 179 | } |
| 180 | |
| 181 | return $array; |
| 182 | } |
| 183 | |
| 184 | protected static function isValueArrayString(string $string): bool |
| 185 | { |
| 186 | return str_starts_with($string, '[') && str_ends_with($string, ']'); |
| 187 | } |
| 188 | } |