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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celemas\Quma; |
| 6 | |
| 7 | use InvalidArgumentException; |
| 8 | use RuntimeException; |
| 9 | |
| 10 | final class Placeholders |
| 11 | { |
| 12 | public const string NAME_PATTERN = '[A-Za-z_][A-Za-z0-9_.:-]*'; |
| 13 | |
| 14 | /** @var non-empty-string */ |
| 15 | private readonly string $tokenPattern; |
| 16 | |
| 17 | /** @var non-empty-string */ |
| 18 | private readonly string $tokenStartPattern; |
| 19 | |
| 20 | /** @var array<string, string> */ |
| 21 | private readonly array $values; |
| 22 | |
| 23 | /** @param array<array-key, mixed> $config */ |
| 24 | public function __construct( |
| 25 | private readonly string $driver, |
| 26 | array $config, |
| 27 | private readonly Delimiters $delimiters, |
| 28 | ) { |
| 29 | $open = preg_quote($this->delimiters->open, '/'); |
| 30 | $close = preg_quote($this->delimiters->close, '/'); |
| 31 | $this->tokenPattern = '/' . $open . '(' . self::NAME_PATTERN . ')' . $close . '/'; |
| 32 | $this->tokenStartPattern = '/^' . $open . '(' . self::NAME_PATTERN . ')' . $close . '/'; |
| 33 | |
| 34 | $normalized = $this->normalizeConfig($config); |
| 35 | $this->values = array_replace( |
| 36 | $normalized['all'] ?? [], |
| 37 | $normalized[$this->driver] ?? [], |
| 38 | ); |
| 39 | } |
| 40 | |
| 41 | public function compileSql(string $source, string $path): string |
| 42 | { |
| 43 | return $this->substituteFragment($source, $path, $source, 0); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * @param array<array-key, mixed> $config |
| 48 | * |
| 49 | * @return array<string, array<string, string>> |
| 50 | */ |
| 51 | private function normalizeConfig(array $config): array |
| 52 | { |
| 53 | $normalized = []; |
| 54 | |
| 55 | foreach ($config as $scope => $values) { |
| 56 | if (!is_string($scope) || $scope === '') { |
| 57 | throw new InvalidArgumentException( |
| 58 | 'Static placeholder scopes must be non-empty strings.', |
| 59 | ); |
| 60 | } |
| 61 | |
| 62 | if ($scope === 'default') { |
| 63 | throw new InvalidArgumentException( |
| 64 | "Static placeholders use the shared scope 'all'. Replace placeholders['default'] with placeholders['all'].", |
| 65 | ); |
| 66 | } |
| 67 | |
| 68 | if (!is_array($values)) { |
| 69 | throw new InvalidArgumentException( |
| 70 | "Static placeholders for scope '{$scope}' must be an array of string values.", |
| 71 | ); |
| 72 | } |
| 73 | |
| 74 | $normalized[$scope] = $this->normalizeValues($scope, $values); |
| 75 | } |
| 76 | |
| 77 | return $normalized; |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * @param array<array-key, mixed> $values |
| 82 | * |
| 83 | * @return array<string, string> |
| 84 | */ |
| 85 | private function normalizeValues(string $scope, array $values): array |
| 86 | { |
| 87 | $normalized = []; |
| 88 | |
| 89 | foreach ($values as $name => $value) { |
| 90 | if (!is_string($name) || !preg_match('/^' . self::NAME_PATTERN . '$/', $name)) { |
| 91 | throw new InvalidArgumentException( |
| 92 | "Invalid static placeholder name in scope '{$scope}'. Names must match " |
| 93 | . self::NAME_PATTERN |
| 94 | . '.', |
| 95 | ); |
| 96 | } |
| 97 | |
| 98 | if (!is_string($value)) { |
| 99 | throw new InvalidArgumentException( |
| 100 | "Static placeholder '{$name}' in scope '{$scope}' must be a string.", |
| 101 | ); |
| 102 | } |
| 103 | |
| 104 | if (str_contains($value, $this->delimiters->open)) { |
| 105 | throw new InvalidArgumentException( |
| 106 | "Static placeholder '{$name}' in scope '{$scope}' must not contain another static placeholder.", |
| 107 | ); |
| 108 | } |
| 109 | |
| 110 | $normalized[$name] = $value; |
| 111 | } |
| 112 | |
| 113 | return $normalized; |
| 114 | } |
| 115 | |
| 116 | private function substituteFragment( |
| 117 | string $fragment, |
| 118 | string $path, |
| 119 | string $source, |
| 120 | int $baseOffset, |
| 121 | ): string { |
| 122 | $this->assertNoMalformedTokens($fragment, $path, $source, $baseOffset); |
| 123 | |
| 124 | $matches = []; |
| 125 | $result = preg_match_all( |
| 126 | $this->tokenPattern, |
| 127 | $fragment, |
| 128 | $matches, |
| 129 | PREG_SET_ORDER | PREG_OFFSET_CAPTURE, |
| 130 | ); |
| 131 | |
| 132 | if ($result === false || $result === 0) { |
| 133 | return $fragment; |
| 134 | } |
| 135 | |
| 136 | $compiled = ''; |
| 137 | $cursor = 0; |
| 138 | |
| 139 | foreach ($matches as $match) { |
| 140 | $placeholder = $match[0][0]; |
| 141 | $offset = $match[0][1]; |
| 142 | $name = $match[1][0]; |
| 143 | |
| 144 | $compiled .= substr($fragment, $cursor, $offset - $cursor); |
| 145 | |
| 146 | if (!array_key_exists($name, $this->values)) { |
| 147 | throw $this->unknownPlaceholder($placeholder, $name, $path, $source, $baseOffset + $offset); |
| 148 | } |
| 149 | |
| 150 | $compiled .= $this->values[$name]; |
| 151 | $cursor = $offset + strlen($placeholder); |
| 152 | } |
| 153 | |
| 154 | return $compiled . substr($fragment, $cursor); |
| 155 | } |
| 156 | |
| 157 | private function assertNoMalformedTokens( |
| 158 | string $fragment, |
| 159 | string $path, |
| 160 | string $source, |
| 161 | int $baseOffset, |
| 162 | ): void { |
| 163 | $offset = 0; |
| 164 | |
| 165 | while (($position = strpos($fragment, $this->delimiters->open, $offset)) !== false) { |
| 166 | $matches = []; |
| 167 | $tail = substr($fragment, $position); |
| 168 | |
| 169 | if (preg_match($this->tokenStartPattern, $tail, $matches) !== 1) { |
| 170 | throw $this->malformedPlaceholder($path, $source, $baseOffset + $position); |
| 171 | } |
| 172 | |
| 173 | $offset = $position + strlen($matches[0]); |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | private function unknownPlaceholder( |
| 178 | string $placeholder, |
| 179 | string $name, |
| 180 | string $path, |
| 181 | string $source, |
| 182 | int $offset, |
| 183 | ): RuntimeException { |
| 184 | [$line, $column] = $this->location($source, $offset); |
| 185 | |
| 186 | return new RuntimeException( |
| 187 | "Unknown static placeholder {$placeholder} in {$path}:{$line}:{$column} for driver \"{$this->driver}\".\n" |
| 188 | . "No value was configured for \"{$name}\".\n" |
| 189 | . "Add placeholders['all']['{$name}'] or placeholders['{$this->driver}']['{$name}'].\n" |
| 190 | . 'Static placeholders are raw SQL fragments. Use them only for trusted configuration, never for user input.', |
| 191 | ); |
| 192 | } |
| 193 | |
| 194 | private function malformedPlaceholder(string $path, string $source, int $offset): RuntimeException |
| 195 | { |
| 196 | [$line, $column] = $this->location($source, $offset); |
| 197 | |
| 198 | return new RuntimeException( |
| 199 | "Malformed static placeholder in {$path}:{$line}:{$column}.\n" |
| 200 | . 'Expected ' |
| 201 | . $this->delimiters->token('name') |
| 202 | . ' where name matches: ' |
| 203 | . self::NAME_PATTERN |
| 204 | . ".\n" |
| 205 | . 'Examples: ' |
| 206 | . $this->delimiters->token('prefix') |
| 207 | . ', ' |
| 208 | . $this->delimiters->token('schema.name') |
| 209 | . ', ' |
| 210 | . $this->delimiters->token('tenant-prefix') |
| 211 | . ', ' |
| 212 | . $this->delimiters->token('cms:prefix') |
| 213 | . '.', |
| 214 | ); |
| 215 | } |
| 216 | |
| 217 | /** @return array{0: int, 1: int} */ |
| 218 | private function location(string $source, int $offset): array |
| 219 | { |
| 220 | $before = substr($source, 0, $offset); |
| 221 | $line = substr_count($before, "\n") + 1; |
| 222 | $lineStart = strrpos($before, "\n"); |
| 223 | $column = $offset + 1; |
| 224 | |
| 225 | if ($lineStart !== false) { |
| 226 | $column = $offset - $lineStart; |
| 227 | } |
| 228 | |
| 229 | return [$line, $column]; |
| 230 | } |
| 231 | } |