How to use the pymoca.parser function in pymoca

# ~100 ms startup overhead for cached models by importing only when
    # compiling.
    from pymoca import parser

    # Load folders
    tree = None
    for folder in [model_folder] + compiler_options['library_folders']:
        for root, dir, files in os.walk(folder, followlinks=True):
            for item in fnmatch.filter(files, "*.mo"):
                logger.info("Parsing {}".format(item))

                with open(os.path.join(root, item), 'r') as f:
                    if tree is None:
                        tree = parser.parse(f.read())
                    else:
                        tree.extend(parser.parse(f.read()))

    # Compile
    logger.info("Generating CasADi model")

    model = generator.generate(tree, model_name, compiler_options)
    if compiler_options['check_balanced']:
        model.check_balanced()

    model.simplify(compiler_options)

    if compiler_options['verbose']:
        model.check_balanced()

    model._post_checks()

    return model

def _compile_model(model_folder: str, model_name: str, compiler_options: Dict[str, str]):
    # Importing the antlr4 (generated modules) is rather slow. Avoid for this
    # ~100 ms startup overhead for cached models by importing only when
    # compiling.
    from pymoca import parser

    # Load folders
    tree = None
    for folder in [model_folder] + compiler_options['library_folders']:
        for root, dir, files in os.walk(folder, followlinks=True):
            for item in fnmatch.filter(files, "*.mo"):
                logger.info("Parsing {}".format(item))

                with open(os.path.join(root, item), 'r') as f:
                    if tree is None:
                        tree = parser.parse(f.read())
                    else:
                        tree.extend(parser.parse(f.read()))

    # Compile
    logger.info("Generating CasADi model")

    model = generator.generate(tree, model_name, compiler_options)
    if compiler_options['check_balanced']:
        model.check_balanced()

    model.simplify(compiler_options)

    if compiler_options['verbose']:
        model.check_balanced()

    model._post_checks()