(module: ModuleType, app_name: str)
| 110 | |
| 111 | |
| 112 | def find_app_by_string(module: ModuleType, app_name: str) -> Quart: |
| 113 | from .app import Quart |
| 114 | |
| 115 | try: |
| 116 | expr = ast.parse(app_name.strip(), mode="eval").body |
| 117 | except SyntaxError: |
| 118 | raise NoAppException( |
| 119 | f"Failed to parse {app_name!r} as an attribute name or function call." |
| 120 | ) from None |
| 121 | |
| 122 | if isinstance(expr, ast.Name): |
| 123 | name = expr.id |
| 124 | args = [] |
| 125 | kwargs = {} |
| 126 | elif isinstance(expr, ast.Call): |
| 127 | # Ensure the function name is an attribute name only. |
| 128 | if not isinstance(expr.func, ast.Name): |
| 129 | raise NoAppException( |
| 130 | f"Function reference must be a simple name: {app_name!r}." |
| 131 | ) |
| 132 | |
| 133 | name = expr.func.id |
| 134 | |
| 135 | # Parse the positional and keyword arguments as literals. |
| 136 | try: |
| 137 | args = [ast.literal_eval(arg) for arg in expr.args] |
| 138 | kwargs = {kw.arg: ast.literal_eval(kw.value) for kw in expr.keywords} |
| 139 | except ValueError: |
| 140 | # literal_eval gives cryptic error messages, show a generic |
| 141 | # message with the full expression instead. |
| 142 | raise NoAppException( |
| 143 | f"Failed to parse arguments as literal values: {app_name!r}." |
| 144 | ) from None |
| 145 | else: |
| 146 | raise NoAppException( |
| 147 | f"Failed to parse {app_name!r} as an attribute name or function call." |
| 148 | ) |
| 149 | |
| 150 | try: |
| 151 | attr = getattr(module, name) |
| 152 | except AttributeError as e: |
| 153 | raise NoAppException( |
| 154 | f"Failed to find attribute {name!r} in {module.__name__!r}." |
| 155 | ) from e |
| 156 | |
| 157 | # If the attribute is a function, call it with any args and kwargs |
| 158 | # to get the real application. |
| 159 | if inspect.isfunction(attr): |
| 160 | try: |
| 161 | app = attr(*args, **kwargs) |
| 162 | except TypeError as e: |
| 163 | if not _called_with_wrong_args(attr): |
| 164 | raise |
| 165 | |
| 166 | raise NoAppException( |
| 167 | f"The factory {app_name!r} in module" |
| 168 | f" {module.__name__!r} could not be called with the" |
| 169 | " specified arguments." |
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