<?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 $data JSON-like data to search
*
* @return mixed|null Returns the matching data or null
*/
public static function search($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 = getenv(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;
$compileDir = getenv(self::COMPILE_DIR) ?: sys_get_temp_dir();
foreach (glob("{$compileDir}/jmespath_*.php") as $file) {
$total++;
unlink($file);
}
return $total;
}
}
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