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