PHP Classes

File: application/modules/extensions/aws/JmesPath/AstRuntime.php

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File: application/modules/extensions/aws/JmesPath/AstRuntime.php
Role: Application script
Content type: text/plain
Description: Initial
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Date: 8 years ago
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<?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|null 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);
    }
}