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from typing import List, Optional, Tuple
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from ._importlib import _resolve_name
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class _ExtractModuleReferences(ast.NodeVisitor):
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Extract the list of global variables a block of code will read and write
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def run(cls, src: str, package: str) -> List[Tuple[str, Optional[str]]]:
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visitor = cls(package)
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return list(visitor.references.keys())
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def __init__(self, package):
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self.package = package
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def _absmodule(self, module_name: str, level: int) -> str:
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return _resolve_name(module_name, self.package, level)
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def visit_Import(self, node):
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for alias in node.names:
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self.references[(alias.name, None)] = True
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def visit_ImportFrom(self, node):
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name = self._absmodule(node.module, 0 if node.level is None else node.level)
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for alias in node.names:
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self.references[(name, alias.name)] = True
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self.references[(name, None)] = True
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def _grab_node_int(self, node):
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def _grab_node_str(self, node):
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def visit_Call(self, node):
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if hasattr(node.func, "id") and node.func.id == "__import__":
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name = self._grab_node_str(node.args[0])
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if len(node.args) > 3:
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for v in node.args[3].elts:
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fromlist.append(self._grab_node_str(v))
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elif hasattr(node, "keywords"):
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for keyword in node.keywords:
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if keyword.arg == "fromlist":
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for v in keyword.value.elts:
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fromlist.append(self._grab_node_str(v))
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if len(node.args) > 4:
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level = self._grab_node_int(node.args[4])
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elif hasattr(node, "keywords"):
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for keyword in node.keywords:
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if keyword.arg == "level":
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level = self._grab_node_int(keyword.value)
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self.references[(name, None)] = True
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top_name = name.rsplit(".", maxsplit=1)[0]
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top_name = self._absmodule(top_name, level)
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self.references[(top_name, None)] = True
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name = self._absmodule(name, level)
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for alias in fromlist:
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self.references[(name, alias)] = True
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self.references[(name, None)] = True
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except Exception as e:
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find_files_source_depends_on = _ExtractModuleReferences.run