Function calculate_active_triggers

mypy/server/update.py:763–808

Determine activated triggers by comparing old and new symbol tables. For example, if only the signature of function m.f is different in the new symbol table, return {' '}.

(
    manager: BuildManager,
    old_snapshots: dict[str, dict[str, SymbolSnapshot]],
    new_modules: dict[str, MypyFile | None],
)

def calculate_active_triggers(
    manager: BuildManager,
    old_snapshots: dict[str, dict[str, SymbolSnapshot]],
    new_modules: dict[str, MypyFile | None],
) -> set[str]:
    """Determine activated triggers by comparing old and new symbol tables.

    For example, if only the signature of function m.f is different in the new
    symbol table, return {'<m.f>'}.
    """
    names: set[str] = set()
    for id in new_modules:
        snapshot1 = old_snapshots.get(id)
        if snapshot1 is None:
            names.add(id)
            snapshot1 = {}
        new = new_modules[id]
        if new is None:
            snapshot2 = snapshot_symbol_table(id, SymbolTable())
            names.add(id)
        else:
            snapshot2 = snapshot_symbol_table(id, new.names)
        diff = compare_symbol_table_snapshots(id, snapshot1, snapshot2)
        package_nesting_level = id.count(".")
        for item in diff.copy():
            if item.count(".") <= package_nesting_level + 1 and item.split(".")[-1] not in (
                "__builtins__",
                "__file__",
                "__name__",
                "__package__",
                "__doc__",
            ):
                # Activate catch-all wildcard trigger for top-level module changes (used for
                # "from m import *"). This also gets triggered by changes to module-private
                # entries, but as these unneeded dependencies only result in extra processing,
                # it's a minor problem.
                #
                # TODO: Some __* names cause mistriggers. Fix the underlying issue instead of
                #     special casing them here.
                diff.add(id + WILDCARD_TAG)
            if item.count(".") > package_nesting_level + 1:
                # These are for changes within classes, used by protocols.
                diff.add(item.rsplit(".", 1)[0] + WILDCARD_TAG)

        names |= diff
    return {make_trigger(name) for name in names}


def replace_modules_with_new_variants(