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<?php
namespace JmesPath;
/**
* Compiles JMESPath expressions to PHP source code and executes it.
*
* JMESPath file names are stored in the cache directory using the following
* logic to determine the filename:
*
* 1. Start with the string "jmespath_"
* 2. Append the MD5 checksum of the expression salted with the PHP version
* and compiled-cache epoch.
* 3. Append ".php"
*/
class CompilerRuntime
{
const CACHE_VERSION = 5;
private $parser;
private $compiler;
private $cacheDir;
private $interpreter;
/**
* @param string|null $dir Directory used to store compiled PHP files.
* @param Parser|null $parser JMESPath parser to utilize
* @throws \RuntimeException if the cache directory cannot be created
*/
public function __construct($dir = null, ?Parser $parser = null)
{
$this->parser = $parser ?: new Parser();
$this->compiler = new TreeCompiler();
$dir = $dir ?: sys_get_temp_dir();
if (!is_dir($dir) && !mkdir($dir, 0755, true)) {
throw new \RuntimeException("Unable to create cache directory: $dir");
}
$this->cacheDir = realpath($dir);
$this->interpreter = new TreeInterpreter();
}
/**
* Returns data from the provided input that matches a given JMESPath
* expression.
*
* @param string $expression JMESPath expression to evaluate
* @param mixed $data Data to search. This data should be data that
* is similar to data returned from json_decode
* using associative arrays rather than objects.
*
* @return mixed Returns the matching data or null
* @throws \RuntimeException
*/
public function __invoke($expression, $data)
{
$functionName = self::functionName($expression);
if (!function_exists($functionName)) {
$filename = "{$this->cacheDir}/{$functionName}.php";
if (!file_exists($filename)) {
$this->compile($filename, $expression, $functionName);
}
require $filename;
}
return $functionName($this->interpreter, $data);
}
/**
* @internal Shared with DebugRuntime so cache naming cannot drift.
*/
public static function functionName($expression)
{
return 'jmespath_' . md5(
'jmespath:' . PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION
. ':' . self::CACHE_VERSION . ':' . $expression
);
}
/** @internal */
public function getCacheDir()
{
return $this->cacheDir;
}
private function compile($filename, $expression, $functionName)
{
$code = $this->compiler->visit(
$this->parser->parse($expression),
$functionName,
$expression
);
$tempFile = $filename . '.' . bin2hex(random_bytes(12)) . '.tmp';
if (!file_put_contents($tempFile, $code)) {
throw new \RuntimeException(sprintf(
'Unable to write the compiled PHP code to: %s (%s)',
$tempFile,
var_export(error_get_last(), true)
));
}
if (!rename($tempFile, $filename)) {
@unlink($tempFile);
if (!file_exists($filename)) {
throw new \RuntimeException(
"Unable to move the compiled PHP code to: {$filename}"
);
}
// Another process won the race; its file is equivalent.
} elseif (function_exists('opcache_invalidate')) {
opcache_invalidate($filename, true);
}
}
}