| from mypy.plugin import Plugin |
| from mypy.nodes import ( |
| ClassDef, Block, TypeInfo, SymbolTable, SymbolTableNode, GDEF, Var |
| ) |
| from mypy.types import Instance |
| |
| DECL_BASES = set() |
| |
| class DynPlugin(Plugin): |
| def get_dynamic_class_hook(self, fullname): |
| if fullname == 'mod.declarative_base': |
| return add_info_hook |
| return None |
| |
| def get_base_class_hook(self, fullname: str): |
| if fullname in DECL_BASES: |
| return replace_col_hook |
| return None |
| |
| def add_info_hook(ctx): |
| class_def = ClassDef(ctx.name, Block([])) |
| class_def.fullname = ctx.api.qualified_name(ctx.name) |
| |
| info = TypeInfo(SymbolTable(), class_def, ctx.api.cur_mod_id) |
| class_def.info = info |
| obj = ctx.api.builtin_type('builtins.object') |
| info.mro = [info, obj.type] |
| info.bases = [obj] |
| ctx.api.add_symbol_table_node(ctx.name, SymbolTableNode(GDEF, info)) |
| DECL_BASES.add(class_def.fullname) |
| |
| def replace_col_hook(ctx): |
| info = ctx.cls.info |
| for sym in info.names.values(): |
| node = sym.node |
| if isinstance(node, Var) and isinstance(node.type, Instance): |
| if node.type.type.fullname() == 'mod.Column': |
| new_sym = ctx.api.lookup_fully_qualified_or_none('mod.Instr') |
| if new_sym: |
| new_info = new_sym.node |
| assert isinstance(new_info, TypeInfo) |
| node.type = Instance(new_info, node.type.args.copy(), |
| node.type.line, |
| node.type.column) |
| |
| def plugin(version): |
| return DynPlugin |
