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<?php |
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declare(strict_types=1); |
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namespace JsonDecodeStream\Internal; |
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use JsonDecodeStream\Exception\SelectorException; |
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use UnexpectedValueException; |
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class Selector |
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{ |
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/** @var static[] */ |
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protected static $cache = []; |
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protected $selector; |
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protected $selectorStack; |
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protected function __construct(string $selector, array $selectorStack) |
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{ |
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$this->selector = $selector; |
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$this->selectorStack = $selectorStack; |
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} |
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1 |
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public function getSelector(): string |
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{ |
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return $this->selector; |
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} |
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public function getSelectorStack(): array |
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{ |
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return $this->selectorStack; |
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} |
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public static function create(string $selector) |
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{ |
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if (empty($selector)) { |
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throw new SelectorException('selector should not be empty'); |
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} |
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if (isset(static::$cache[$selector])) { |
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return static::$cache[$selector]; |
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} |
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$selectorStack = []; |
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$offset = 0; |
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while ($offset < strlen($selector)) { |
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$part = substr($selector, $offset); |
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$matches = null; |
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if (preg_match('/^\[]/', $part, $matches)) { |
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// `[]` |
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array_push( |
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$selectorStack, |
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[ 'type' => 'any' ] |
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); |
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} elseif ($offset == 0 && preg_match('/^([a-z_\$][a-z0-9_\$]*)/i', $part, $matches)) { |
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// `foo` but only as a beginning of selector |
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array_push( |
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$selectorStack, |
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[ 'type' => 'key', 'key' => $matches[1] ] |
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); |
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} elseif (preg_match('/^\.([a-z_\$][a-z0-9_\$]*)/i', $part, $matches)) { |
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// `.foo` |
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array_push( |
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$selectorStack, |
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[ 'type' => 'key', 'key' => $matches[1] ] |
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); |
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} elseif (preg_match('/^\[(0|[1-9][0-9]*)]/', $part, $matches)) { |
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// `[1]` |
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array_push( |
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$selectorStack, |
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[ 'type' => 'index', 'index' => (int)$matches[1] ] |
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); |
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} elseif (preg_match('/^\[(0|[1-9][0-9]*)?:(0|[1-9][0-9]*)?]/', $part, $matches)) { |
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// `[1:9]` or `[1:]` or `[:9]` |
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$firstIndex = strlen($matches[1] ?? '') ? (int)$matches[1] : null; |
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$lastIndex = strlen($matches[2] ?? '') ? (int)$matches[2] : null; |
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if ($firstIndex === null && $lastIndex === null) { |
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throw new SelectorException('Wrong array range selector: "[:]"'); |
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} |
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array_push( |
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$selectorStack, |
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[ 'type' => 'range', 'start' => $firstIndex, 'end' => $lastIndex ] |
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); |
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} elseif (preg_match('/^\["((?:[^"\\\\]+|\\\\.)*)"]/', $part, $matches)) { |
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// `["foo"]` and also `["The \"Foo\" key"]` |
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array_push( |
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$selectorStack, |
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[ 'type' => 'key', 'key' => $matches[1] ] |
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); |
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} |
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if ($matches) { |
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$offset += strlen($matches[0]); |
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} else { |
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throw new SelectorException('Wrong selector at `' . $part . '`'); |
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} |
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} |
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return static::$cache[$selector] = new static($selector, $selectorStack); |
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} |
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public function match(Stack $stack) |
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{ |
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$stackFrames = $stack->frames(); |
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foreach ($this->getSelectorStack() as $i => $selStackFrame) { |
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$stackFrame = $stackFrames[$i] ?? null; |
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if ($stackFrame == null) { |
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return false; |
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} |
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switch ($selStackFrame['type']) { |
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case 'any': |
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break; |
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case 'key': |
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if (!$stackFrame->isObject()) { |
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return false; |
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} |
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if ($stackFrame->getLastKey() !== $selStackFrame['key']) { |
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return false; |
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} |
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break; |
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case 'index': |
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if (!$stackFrame->isArray()) { |
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return false; |
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} |
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1 |
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if ($stackFrame->getLastKey() !== $selStackFrame['index']) { |
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return false; |
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} |
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break; |
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case 'range': |
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if (!$stackFrame->isArray()) { |
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return false; |
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} |
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if ($selStackFrame['start'] !== null && $stackFrame->getLastKey() < $selStackFrame['start']) { |
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return false; |
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} |
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2 |
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if ($selStackFrame['end'] !== null && $stackFrame->getLastKey() > $selStackFrame['end']) { |
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return false; |
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} |
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break; |
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default: |
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throw new UnexpectedValueException($selStackFrame['type']); |
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} |
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} |
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return true; |
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} |
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} |
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klkvsk /
json-decode-stream
