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"""Interface to the compiler's internal symbol tables"""

import _symtable
from _symtable import (USE, DEF_GLOBAL, DEF_LOCAL, DEF_PARAM,
     DEF_IMPORT, DEF_BOUND, SCOPE_OFF, SCOPE_MASK, FREE,
     LOCAL, GLOBAL_IMPLICIT, GLOBAL_EXPLICIT, CELL)

import weakref

__all__ = ["symtable", "SymbolTable", "Class", "Function", "Symbol"]

def symtable(code, filename, compile_type):
    top = _symtable.symtable(code, filename, compile_type)
    return _newSymbolTable(top, filename)

class SymbolTableFactory:
    def __init__(self):
        self.__memo = weakref.WeakValueDictionary()

    def new(self, table, filename):
        if table.type == _symtable.TYPE_FUNCTION:
            return Function(table, filename)
        if table.type == _symtable.TYPE_CLASS:
            return Class(table, filename)
        return SymbolTable(table, filename)

    def __call__(self, table, filename):
        key = table, filename
        obj = self.__memo.get(key, None)
        if obj is None:
            obj = self.__memo[key] = self.new(table, filename)
        return obj

_newSymbolTable = SymbolTableFactory()


class SymbolTable(object):

    def __init__(self, raw_table, filename):
        self._table = raw_table
        self._filename = filename
        self._symbols = {}

    def __repr__(self):
        if self.__class__ == SymbolTable:
            kind = ""
        else:
            kind = "%s " % self.__class__.__name__

        if self._table.name == "global":
            return "<{0}SymbolTable for module {1}>".format(kind, self._filename)
        else:
            return "<{0}SymbolTable for {1} in {2}>".format(kind,
                                                            self._table.name,
                                                            self._filename)

    def get_type(self):
        if self._table.type == _symtable.TYPE_MODULE:
            return "module"
        if self._table.type == _symtable.TYPE_FUNCTION:
            return "function"
        if self._table.type == _symtable.TYPE_CLASS:
            return "class"
        assert self._table.type in (1, 2, 3), \
               "unexpected type: {0}".format(self._table.type)

    def get_id(self):
        return self._table.id

    def get_name(self):
        return self._table.name

    def get_lineno(self):
        return self._table.lineno

    def is_optimized(self):
        return bool(self._table.type == _symtable.TYPE_FUNCTION)

    def is_nested(self):
        return bool(self._table.nested)

    def has_children(self):
        return bool(self._table.children)

    def has_exec(self):
        """Return true if the scope uses exec.  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)
            sym = self._symbols[name] = Symbol(name, flags, namespaces)
        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

    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_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(object):

    def __init__(self, name, flags, namespaces=None):
        self.__name = name
        self.__flags = flags
        self.__scope = (flags >> SCOPE_OFF) & SCOPE_MASK # like PyST_GetScope()
        self.__namespaces = namespaces or ()

    def __repr__(self):
        return "<symbol {0!r}>".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 bool(self.__scope in (GLOBAL_IMPLICIT, GLOBAL_EXPLICIT))

    def is_declared_global(self):
        return bool(self.__scope == GLOBAL_EXPLICIT)

    def is_local(self):
        return bool(self.__flags & DEF_BOUND)

    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())

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Taylor Schaub, an MMJ with Spectrum News 1 in LA, took the 5-Day Intensive Video Storytelling Bootcamp in 2023.

Here is a story he turned in only one day, using only an iPhone. It was the first video story he ever did and it was nominated for an Emmy.

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British based Oyster Yachts makes some of the finest yachts in the world. Like every other company, they had to find a way to feed the never-ending video demands of social media – sites like Instagram and TikTok. We trained the Oyster staff to tell their own stories, using only iPhones.

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Michael on Media

Michael Rosenblum has been writing about the media since 1988. His work and ideas have appeared in The Guardian, The Huffington Post, Ilkeston Life and many other publications.

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