mirror of https://github.com/python/cpython
70 lines
2.7 KiB
Python
70 lines
2.7 KiB
Python
"""
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Copy-parse of ast.dump, removing the `isinstance` checks. This is needed,
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because testing pegen requires generating a C extension module, which contains
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a copy of the symbols defined in Python-ast.c. Thus, the isinstance check would
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always fail. We rely on string comparison of the base classes instead.
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TODO: Remove the above-described hack.
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"""
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from typing import Any, Optional, Tuple
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def ast_dump(
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node: Any,
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annotate_fields: bool = True,
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include_attributes: bool = False,
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*,
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indent: Optional[str] = None,
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) -> str:
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def _format(node: Any, level: int = 0) -> Tuple[str, bool]:
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if indent is not None:
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level += 1
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prefix = "\n" + indent * level
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sep = ",\n" + indent * level
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else:
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prefix = ""
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sep = ", "
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if any(cls.__name__ == "AST" for cls in node.__class__.__mro__):
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cls = type(node)
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args = []
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allsimple = True
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keywords = annotate_fields
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for name in node._fields:
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try:
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value = getattr(node, name)
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except AttributeError:
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keywords = True
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continue
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if value is None and getattr(cls, name, ...) is None:
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keywords = True
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continue
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value, simple = _format(value, level)
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allsimple = allsimple and simple
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if keywords:
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args.append("%s=%s" % (name, value))
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else:
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args.append(value)
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if include_attributes and node._attributes:
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for name in node._attributes:
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try:
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value = getattr(node, name)
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except AttributeError:
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continue
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if value is None and getattr(cls, name, ...) is None:
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continue
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value, simple = _format(value, level)
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allsimple = allsimple and simple
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args.append("%s=%s" % (name, value))
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if allsimple and len(args) <= 3:
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return "%s(%s)" % (node.__class__.__name__, ", ".join(args)), not args
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return "%s(%s%s)" % (node.__class__.__name__, prefix, sep.join(args)), False
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elif isinstance(node, list):
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if not node:
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return "[]", True
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return "[%s%s]" % (prefix, sep.join(_format(x, level)[0] for x in node)), False
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return repr(node), True
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if all(cls.__name__ != "AST" for cls in node.__class__.__mro__):
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raise TypeError("expected AST, got %r" % node.__class__.__name__)
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return _format(node)[0]
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