| 334 | |
| 335 | @classmethod |
| 336 | def parse(cls, location, package_only=True): |
| 337 | |
| 338 | with open(location, 'rb') as f: |
| 339 | tree = ast.parse(f.read()) |
| 340 | |
| 341 | metadata_fields = {} |
| 342 | for statement in tree.body: |
| 343 | if not (hasattr(statement, 'targets') and isinstance(statement, ast.Assign)): |
| 344 | continue |
| 345 | |
| 346 | # We are looking for a dictionary assigned to the variable `METADATA` |
| 347 | for target in statement.targets: |
| 348 | if not (target.id == 'METADATA' and isinstance(statement.value, ast.Dict)): |
| 349 | continue |
| 350 | # Once we find the dictionary assignment, get and store its contents |
| 351 | statement_keys = statement.value.keys |
| 352 | statement_values = statement.value.values |
| 353 | for statement_k, statement_v in zip(statement_keys, statement_values): |
| 354 | if isinstance(statement_k, ast.Constant) and isinstance(statement_k.value, str): |
| 355 | key_name = statement_k.value |
| 356 | # The list values in a `METADATA.bzl` file seem to only contain strings |
| 357 | if isinstance(statement_v, ast.List): |
| 358 | value = [] |
| 359 | for e in statement_v.elts: |
| 360 | if not (isinstance(e, ast.Constant) and isinstance(e.value, str)): |
| 361 | continue |
| 362 | value.append(e.value) |
| 363 | if isinstance(statement_v, ast.Constant): |
| 364 | value = statement_v.value |
| 365 | metadata_fields[key_name] = value |
| 366 | |
| 367 | parties = [] |
| 368 | maintainers = metadata_fields.get('maintainers', []) or [] |
| 369 | for maintainer in maintainers: |
| 370 | parties.append( |
| 371 | models.Party( |
| 372 | type=models.party_org, |
| 373 | name=maintainer, |
| 374 | role='maintainer', |
| 375 | ) |
| 376 | ) |
| 377 | |
| 378 | # TODO: Create function that determines package type from download URL, |
| 379 | # then create a package of that package type from the metadata info |
| 380 | |
| 381 | if 'upstream_type' in metadata_fields: |
| 382 | package_type = metadata_fields['upstream_type'] |
| 383 | elif 'package_type' in metadata_fields: |
| 384 | package_type = metadata_fields['package_type'] |
| 385 | else: |
| 386 | package_type = cls.default_package_type |
| 387 | |
| 388 | if 'licenses' in metadata_fields: |
| 389 | extracted_license_statement = metadata_fields['licenses'] |
| 390 | else: |
| 391 | extracted_license_statement = metadata_fields.get('license_expression') |
| 392 | |
| 393 | if 'upstream_address' in metadata_fields: |