Produces invalid Python syntax from some multi-line GraphQL comments

[syntaxaire]

Describe the bug datamodel-code-generator creates invalid Python syntax if multi-line comments are present on some GraphQL items.

This was discovered on the Shopify API and a minimal reproduction is below.

Workaround: Disable the default black formatter (which discovers the syntax error and exits) using datamodel-codegen --formatters isort. This allows outputting the broken Python, so then you can fix 32000 lines of code by hand.

To Reproduce

Example schema:

"""
Test
What's up?
"""
type Type1 {
  id: ID!
}

"""
Test
What's up?
"""
type Type2 {
  id: ID!
}

"""
Test
What's going on?
"""
union Union1 = Type1 | Type2

Used commandline:

$ poetry run datamodel-codegen --input invalid.graphql --input-file-type graphql --output invalid.py

Expected behavior Should produce:

class Type1(BaseModel):
    """
    Test
    What's up?
    """
    id: ID
    typename__: Optional[Literal['Type1']] = Field('Type1', alias='__typename')

class Type2(BaseModel):
    """
    Test
    What's up?
    """
    id: ID
    typename__: Optional[Literal['Type2']] = Field('Type2', alias='__typename')

"""
Test
What's going on?
"""
Union1: TypeAlias = Union[
    'Type1',
    'Type2',
]

Actually produces:

class Type1(BaseModel):
    """
    Test
    What's up?
    """
    id: ID
    typename__: Optional[Literal['Type1']] = Field('Type1', alias='__typename')

class Type2(BaseModel):
    """
    Test
    What's up?
    """
    id: ID
    typename__: Optional[Literal['Type2']] = Field('Type2', alias='__typename')

# Test
What's going on?
Union1: TypeAlias = Union[
    'Type1',
    'Type2',
]

Version:

• OS: Arch Linux
• Python version: 3.13
• datamodel-code-generator version: 0.28.4