import subprocess
import json
class ParserError(Exception):
    pass
class Parser:
    def parse(self,tokens):
        result = subprocess.run(['./parse.exe'], input=json.dumps(tokens, indent=4).encode('utf-8'),stdout=subprocess.PIPE)
        ast = json.loads(result.stdout.decode('utf-8'))
        if "error" in ast:
            raise ParserError(f"{ast['message']}")
        return json.loads(result.stdout.decode('utf-8'))