84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
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"""Check for duplicate AST nodes after merge."""
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from __future__ import annotations
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from typing import Final
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from mypy.nodes import Decorator, FakeInfo, FuncDef, SymbolNode, Var
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from mypy.server.objgraph import get_path, get_reachable_graph
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# If True, print more verbose output on failure.
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DUMP_MISMATCH_NODES: Final = False
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def check_consistency(o: object) -> None:
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"""Fail if there are two AST nodes with the same fullname reachable from 'o'.
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Raise AssertionError on failure and print some debugging output.
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"""
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seen, parents = get_reachable_graph(o)
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reachable = list(seen.values())
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syms = [x for x in reachable if isinstance(x, SymbolNode)]
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m: dict[str, SymbolNode] = {}
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for sym in syms:
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if isinstance(sym, FakeInfo):
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continue
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fn = sym.fullname
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# Skip None names, since they are ambiguous.
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# TODO: Everything should have a proper full name?
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if fn is None:
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continue
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# Skip stuff that should be expected to have duplicate names
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if isinstance(sym, (Var, Decorator)):
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continue
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if isinstance(sym, FuncDef) and sym.is_overload:
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continue
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if fn not in m:
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m[sym.fullname] = sym
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continue
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# We have trouble and need to decide what to do about it.
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sym1, sym2 = sym, m[fn]
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# If the type changed, then it shouldn't have been merged.
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if type(sym1) is not type(sym2):
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continue
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path1 = get_path(sym1, seen, parents)
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path2 = get_path(sym2, seen, parents)
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if fn in m:
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print(f"\nDuplicate {type(sym).__name__!r} nodes with fullname {fn!r} found:")
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print("[1] %d: %s" % (id(sym1), path_to_str(path1)))
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print("[2] %d: %s" % (id(sym2), path_to_str(path2)))
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if DUMP_MISMATCH_NODES and fn in m:
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# Add verbose output with full AST node contents.
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print("---")
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print(id(sym1), sym1)
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print("---")
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print(id(sym2), sym2)
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assert sym.fullname not in m
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def path_to_str(path: list[tuple[object, object]]) -> str:
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result = "<root>"
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for attr, obj in path:
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t = type(obj).__name__
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if t in ("dict", "tuple", "SymbolTable", "list"):
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result += f"[{repr(attr)}]"
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else:
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if isinstance(obj, Var):
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result += f".{attr}({t}:{obj.name})"
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elif t in ("BuildManager", "FineGrainedBuildManager"):
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# Omit class name for some classes that aren't part of a class
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# hierarchy since there isn't much ambiguity.
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result += f".{attr}"
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else:
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result += f".{attr}({t})"
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return result
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