48 lines
1.4 KiB
PHP
48 lines
1.4 KiB
PHP
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<?php
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namespace JmesPath;
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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(
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Parser $parser = null,
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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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