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<?php |
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|
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namespace Dudlewebs\WPMCS\s3\JmesPath; |
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|
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/** |
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* Uses an external tree visitor to interpret an AST. |
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*/ |
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class AstRuntime |
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{ |
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private $parser; |
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private $interpreter; |
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private $cache = []; |
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private $cachedCount = 0; |
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public function __construct(Parser $parser = null, callable $fnDispatcher = null) |
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{ |
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$fnDispatcher = $fnDispatcher ?: FnDispatcher::getInstance(); |
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$this->interpreter = new TreeInterpreter($fnDispatcher); |
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$this->parser = $parser ?: new Parser(); |
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} |
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/** |
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* Returns data from the provided input that matches a given JMESPath |
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* expression. |
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* |
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* @param string $expression JMESPath expression to evaluate |
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* @param mixed $data Data to search. This data should be data that |
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* is similar to data returned from json_decode |
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* using associative arrays rather than objects. |
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* |
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* @return mixed Returns the matching data or null |
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*/ |
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public function __invoke($expression, $data) |
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{ |
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if (!isset($this->cache[$expression])) { |
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// Clear the AST cache when it hits 1024 entries |
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if (++$this->cachedCount > 1024) { |
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$this->cache = []; |
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$this->cachedCount = 0; |
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} |
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$this->cache[$expression] = $this->parser->parse($expression); |
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} |
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return $this->interpreter->visit($this->cache[$expression], $data); |
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} |
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} |
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|
