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from typing import List, Optional, Tuple
import ast
from ._importlib import _resolve_name
class _ExtractModuleReferences(ast.NodeVisitor):
"""
Extract the list of global variables a block of code will read and write
"""
@classmethod
def run(cls, src: str, package: str) -> List[Tuple[str, Optional[str]]]:
visitor = cls(package)
tree = ast.parse(src)
visitor.visit(tree)
return list(visitor.references.keys())
def __init__(self, package):
super().__init__()
self.package = package
self.references = {}
def _absmodule(self, module_name: str, level: int) -> str:
if level > 0:
return _resolve_name(module_name, self.package, level)
return module_name
def visit_Import(self, node):
for alias in node.names:
self.references[(alias.name, None)] = True
def visit_ImportFrom(self, node):
name = self._absmodule(node.module, 0 if node.level is None else node.level)
for alias in node.names:
# from my_package import foo
# foo may be a module, so we have to add it to the list of
# potential references, if import of it fails, we will ignore it
if alias.name != '*':
self.references[(name, alias.name)] = True
else:
self.references[(name, None)] = True
find_files_source_depends_on = _ExtractModuleReferences.run
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