Zephir\CompilerFile::genIR PHP Method

    public function genIR(Compiler $compiler)
    {
        $normalizedPath = str_replace(array(DIRECTORY_SEPARATOR, ":", '/'), '_', realpath($this->_filePath));
        $compilePath = DIRECTORY_SEPARATOR . Compiler::getCurrentVersion() . DIRECTORY_SEPARATOR . $normalizedPath . ".js";
        $zepRealPath = realpath($this->_filePath);
        $changed = false;
        $fileSystem = $compiler->getFileSystem();
        if ($fileSystem->exists($compilePath)) {
            $modificationTime = $fileSystem->modificationTime($compilePath);
            if ($modificationTime < filemtime($zepRealPath)) {
                $changed = true;
            }
        } else {
            $changed = true;
        }
        $ir = null;
        if ($changed) {
            if (!function_exists('zephir_parse_file')) {
                throw new Exception("Parser extension couldn't be loaded");
            }
            $ir = zephir_parse_file(file_get_contents($zepRealPath), $zepRealPath);
            $fileSystem->write($compilePath, json_encode($ir, JSON_PRETTY_PRINT));
        }
        if ($changed || !$fileSystem->exists($compilePath . '.php')) {
            if (!isset($ir)) {
                $ir = json_decode($fileSystem->read($compilePath), true);
            }
            $data = '<?php return ' . var_export($ir, true) . ';';
            $fileSystem->write($compilePath . '.php', $data);
        }
        return $fileSystem->requireFile($compilePath . '.php');
    }