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Deprecated method.""" return False def get_identifiers(self): return self._table.symbols.keys() def lookup(self, name): sym = self._symbols.get(name) if sym is None: flags = self._table.symbols[name] namespaces = self.__check_children(name) module_scope = (self._table.name == "top") sym = self._symbols[name] = Symbol(name, flags, namespaces, module_scope=module_scope) return sym def get_symbols(self): return [self.lookup(ident) for ident in self.get_identifiers()] def __check_children(self, name): return [_newSymbolTable(st, self._filename) for st in self._table.children if st.name == name] def get_children(self): return [_newSymbolTable(st, self._filename) for st in self._table.children] class Function(SymbolTable): # Default values for instance variables __params = None __locals = None __frees = None __globals = None __nonlocals = None def __idents_matching(self, test_func): return tuple(ident for ident in self.get_identifiers() if test_func(self._table.symbols[ident])) def get_parameters(self): if self.__params is None: self.__params = self.__idents_matching(lambda x:x & DEF_PARAM) return self.__params def get_locals(self): if self.__locals is None: locs = (LOCAL, CELL) test = lambda x: ((x >> SCOPE_OFF) & SCOPE_MASK) in locs self.__locals = self.__idents_matching(test) return self.__locals def get_globals(self): if self.__globals is None: glob = (GLOBAL_IMPLICIT, GLOBAL_EXPLICIT) test = lambda x:((x >> SCOPE_OFF) & SCOPE_MASK) in glob self.__globals = self.__idents_matching(test) return self.__globals def get_nonlocals(self): if self.__nonlocals is None: self.__nonlocals = self.__idents_matching(lambda x:x & DEF_NONLOCAL) return self.__nonlocals def get_frees(self): if self.__frees is None: is_free = lambda x:((x >> SCOPE_OFF) & SCOPE_MASK) == FREE self.__frees = self.__idents_matching(is_free) return self.__frees class Class(SymbolTable): __methods = None def get_methods(self): if self.__methods is None: d = {} for st in self._table.children: d[st.name] = 1 self.__methods = tuple(d) return self.__methods class Symbol: def __init__(self, name, flags, namespaces=None, *, module_scope=False): self.__name = name self.__flags = flags self.__scope = (flags >> SCOPE_OFF) & SCOPE_MASK # like PyST_GetScope() self.__namespaces = namespaces or () self.__module_scope = module_scope def __repr__(self): return "".format(self.__name) def get_name(self): return self.__name def is_referenced(self): return bool(self.__flags & _symtable.USE) def is_parameter(self): return bool(self.__flags & DEF_PARAM) def is_global(self): """Return *True* if the sysmbol is global. """ return bool(self.__scope in (GLOBAL_IMPLICIT, GLOBAL_EXPLICIT) or (self.__module_scope and self.__flags & DEF_BOUND)) def is_nonlocal(self): return bool(self.__flags & DEF_NONLOCAL) def is_declared_global(self): return bool(self.__scope == GLOBAL_EXPLICIT) def is_local(self): """Return *True* if the symbol is local. """ return bool(self.__scope in (LOCAL, CELL) or (self.__module_scope and self.__flags & DEF_BOUND)) def is_annotated(self): return bool(self.__flags & DEF_ANNOT) def is_free(self): return bool(self.__scope == FREE) def is_imported(self): return bool(self.__flags & DEF_IMPORT) def is_assigned(self): return bool(self.__flags & DEF_LOCAL) def is_namespace(self): """Returns true if name binding introduces new namespace. If the name is used as the target of a function or class statement, this will be true. Note that a single name can be bound to multiple objects. If is_namespace() is true, the name may also be bound to other objects, like an int or list, that does not introduce a new namespace. """ return bool(self.__namespaces) def get_namespaces(self): """Return a list of namespaces bound to this name""" return self.__namespaces def get_namespace(self): """Returns the single namespace bound to this name. Raises ValueError if the name is bound to multiple namespaces. """ if len(self.__namespaces) != 1: raise ValueError("name is bound to multiple namespaces") return self.__namespaces[0] if __name__ == "__main__": import os, sys with open(sys.argv[0]) as f: src = f.read() mod = symtable(src, os.path.split(sys.argv[0])[1], "exec") for ident in mod.get_identifiers(): info = mod.lookup(ident) print(info, info.is_local(), info.is_namespace())