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<?php namespace JmesPath; /** * Provides a simple environment based search. * * The runtime utilized by the Env class can be customized via environment * variables. If the JP_PHP_COMPILE environment variable is specified, then the * CompilerRuntime will be utilized. If set to "on", JMESPath expressions will * be cached to the system's temp directory. Set the environment variable to * a string to cache expressions to a specific directory. */ final class Env { const COMPILE_DIR = 'JP_PHP_COMPILE'; /** * Returns data from the input array that matches a JMESPath expression. * * @param string $expression JMESPath expression to evaluate * @param mixed $data JSON-like data to search * * @return mixed Returns the matching data or null */ public static function search($expression, $data) { static $runtime; if (!$runtime) { $runtime = Env::createRuntime(); } return $runtime($expression, $data); } /** * Creates a JMESPath runtime based on environment variables and extensions * available on a system. * * @return callable */ public static function createRuntime() { switch ($compileDir = self::getEnvVariable(self::COMPILE_DIR)) { case false: return new AstRuntime(); case 'on': return new CompilerRuntime(); default: return new CompilerRuntime($compileDir); } } /** * Delete all previously compiled JMESPath files from the JP_COMPILE_DIR * directory or sys_get_temp_dir(). * * @return int Returns the number of deleted files. */ public static function cleanCompileDir() { $total = 0; $compileDir = self::getEnvVariable(self::COMPILE_DIR) ?: sys_get_temp_dir(); foreach (glob("{$compileDir}/jmespath_*.php") as $file) { $total++; unlink($file); } return $total; } /** * Reads an environment variable from $_SERVER, $_ENV or via getenv(). * * @param string $name * * @return string|null */ private static function getEnvVariable($name) { if (array_key_exists($name, $_SERVER)) { return $_SERVER[$name]; } if (array_key_exists($name, $_ENV)) { return $_ENV[$name]; } $value = getenv($name); return $value === false ? null : $value; } }
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