symbian-qemu-0.9.1-12/python-2.6.1/Lib/symtable.py
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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"""Interface to the compiler's internal symbol tables"""
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import _symtable
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from _symtable import (USE, DEF_GLOBAL, DEF_LOCAL, DEF_PARAM,
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     DEF_IMPORT, DEF_BOUND, OPT_IMPORT_STAR, OPT_EXEC, OPT_BARE_EXEC,
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     SCOPE_OFF, SCOPE_MASK, FREE, GLOBAL_IMPLICIT, GLOBAL_EXPLICIT)
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import warnings
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import weakref
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__all__ = ["symtable", "SymbolTable", "Class", "Function", "Symbol"]
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def symtable(code, filename, compile_type):
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    raw = _symtable.symtable(code, filename, compile_type)
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    for top in raw.itervalues():
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        if top.name == 'top':
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            break
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    return _newSymbolTable(top, filename)
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class SymbolTableFactory:
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    def __init__(self):
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        self.__memo = weakref.WeakValueDictionary()
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    def new(self, table, filename):
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        if table.type == _symtable.TYPE_FUNCTION:
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            return Function(table, filename)
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        if table.type == _symtable.TYPE_CLASS:
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            return Class(table, filename)
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        return SymbolTable(table, filename)
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    def __call__(self, table, filename):
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        key = table, filename
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        obj = self.__memo.get(key, None)
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        if obj is None:
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            obj = self.__memo[key] = self.new(table, filename)
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        return obj
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_newSymbolTable = SymbolTableFactory()
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class SymbolTable(object):
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    def __init__(self, raw_table, filename):
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        self._table = raw_table
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        self._filename = filename
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        self._symbols = {}
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    def __repr__(self):
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        if self.__class__ == SymbolTable:
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            kind = ""
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        else:
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            kind = "%s " % self.__class__.__name__
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        if self._table.name == "global":
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            return "<{0}SymbolTable for module {1}>".format(kind, self._filename)
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        else:
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            return "<{0}SymbolTable for {1} in {2}>".format(kind,
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                                                            self._table.name,
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                                                            self._filename)
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    def get_type(self):
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        if self._table.type == _symtable.TYPE_MODULE:
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            return "module"
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        if self._table.type == _symtable.TYPE_FUNCTION:
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            return "function"
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        if self._table.type == _symtable.TYPE_CLASS:
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            return "class"
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        assert self._table.type in (1, 2, 3), \
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               "unexpected type: {0}".format(self._table.type)
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    def get_id(self):
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        return self._table.id
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    def get_name(self):
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        return self._table.name
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    def get_lineno(self):
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        return self._table.lineno
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    def is_optimized(self):
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        return bool(self._table.type == _symtable.TYPE_FUNCTION
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                    and not self._table.optimized)
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    def is_nested(self):
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        return bool(self._table.nested)
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    def has_children(self):
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        return bool(self._table.children)
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    def has_exec(self):
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        """Return true if the scope uses exec"""
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        return bool(self._table.optimized & (OPT_EXEC | OPT_BARE_EXEC))
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    def has_import_star(self):
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        """Return true if the scope uses import *"""
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        return bool(self._table.optimized & OPT_IMPORT_STAR)
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    def get_identifiers(self):
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        return self._table.symbols.keys()
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    def lookup(self, name):
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        sym = self._symbols.get(name)
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        if sym is None:
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            flags = self._table.symbols[name]
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            namespaces = self.__check_children(name)
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            sym = self._symbols[name] = Symbol(name, flags, namespaces)
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        return sym
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    def get_symbols(self):
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        return [self.lookup(ident) for ident in self.get_identifiers()]
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    def __check_children(self, name):
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        return [_newSymbolTable(st, self._filename)
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                for st in self._table.children
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                if st.name == name]
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    def get_children(self):
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        return [_newSymbolTable(st, self._filename)
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                for st in self._table.children]
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class Function(SymbolTable):
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    # Default values for instance variables
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    __params = None
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    __locals = None
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    __frees = None
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    __globals = None
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    def __idents_matching(self, test_func):
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        return tuple([ident for ident in self.get_identifiers()
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                      if test_func(self._table.symbols[ident])])
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    def get_parameters(self):
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        if self.__params is None:
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            self.__params = self.__idents_matching(lambda x:x & DEF_PARAM)
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        return self.__params
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   138
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    def get_locals(self):
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        if self.__locals is None:
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            self.__locals = self.__idents_matching(lambda x:x & DEF_BOUND)
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        return self.__locals
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    def get_globals(self):
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        if self.__globals is None:
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            glob = (GLOBAL_IMPLICIT, GLOBAL_EXPLICIT)
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            test = lambda x:((x >> SCOPE_OFF) & SCOPE_MASK) in glob
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            self.__globals = self.__idents_matching(test)
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        return self.__globals
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    def get_frees(self):
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        if self.__frees is None:
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            is_free = lambda x:((x >> SCOPE_OFF) & SCOPE_MASK) == FREE
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            self.__frees = self.__idents_matching(is_free)
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        return self.__frees
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   156
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class Class(SymbolTable):
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    __methods = None
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   161
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    def get_methods(self):
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   163
        if self.__methods is None:
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   164
            d = {}
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   165
            for st in self._table.children:
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                d[st.name] = 1
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            self.__methods = tuple(d)
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   168
        return self.__methods
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   169
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class Symbol(object):
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   172
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   173
    def __init__(self, name, flags, namespaces=None):
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   174
        self.__name = name
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   175
        self.__flags = flags
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   176
        self.__scope = (flags >> SCOPE_OFF) & SCOPE_MASK # like PyST_GetScope()
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diff changeset
   177
        self.__namespaces = namespaces or ()
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diff changeset
   178
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   179
    def __repr__(self):
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   180
        return "<symbol {0!r}>".format(self.__name)
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diff changeset
   181
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   182
    def get_name(self):
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diff changeset
   183
        return self.__name
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diff changeset
   184
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   185
    def is_referenced(self):
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parents:
diff changeset
   186
        return bool(self.__flags & _symtable.USE)
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parents:
diff changeset
   187
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   188
    def is_parameter(self):
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diff changeset
   189
        return bool(self.__flags & DEF_PARAM)
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diff changeset
   190
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   191
    def is_global(self):
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   192
        return bool(self.__scope in (GLOBAL_IMPLICIT, GLOBAL_EXPLICIT))
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parents:
diff changeset
   193
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   194
    def is_vararg(self):
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parents:
diff changeset
   195
        warnings.warn("is_vararg() is obsolete and will be removed",
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   196
                      DeprecationWarning, 2)
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parents:
diff changeset
   197
        return False
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diff changeset
   198
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   199
    def is_keywordarg(self):
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parents:
diff changeset
   200
        warnings.warn("is_keywordarg() is obsolete and will be removed",
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parents:
diff changeset
   201
                      DeprecationWarning, 2)
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parents:
diff changeset
   202
        return False
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parents:
diff changeset
   203
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   204
    def is_local(self):
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parents:
diff changeset
   205
        return bool(self.__flags & DEF_BOUND)
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parents:
diff changeset
   206
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   207
    def is_free(self):
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parents:
diff changeset
   208
        return bool(self.__scope == FREE)
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parents:
diff changeset
   209
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   210
    def is_imported(self):
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   211
        return bool(self.__flags & DEF_IMPORT)
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parents:
diff changeset
   212
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   213
    def is_assigned(self):
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   214
        return bool(self.__flags & DEF_LOCAL)
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parents:
diff changeset
   215
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   216
    def is_in_tuple(self):
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parents:
diff changeset
   217
        warnings.warn("is_in_tuple() is obsolete and will be removed",
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parents:
diff changeset
   218
                      DeprecationWarning, 2)
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parents:
diff changeset
   219
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   220
    def is_namespace(self):
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parents:
diff changeset
   221
        """Returns true if name binding introduces new namespace.
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parents:
diff changeset
   222
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   223
        If the name is used as the target of a function or class
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   224
        statement, this will be true.
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parents:
diff changeset
   225
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   226
        Note that a single name can be bound to multiple objects.  If
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   227
        is_namespace() is true, the name may also be bound to other
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   228
        objects, like an int or list, that does not introduce a new
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   229
        namespace.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   230
        """
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   231
        return bool(self.__namespaces)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   232
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   233
    def get_namespaces(self):
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   234
        """Return a list of namespaces bound to this name"""
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   235
        return self.__namespaces
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   236
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   237
    def get_namespace(self):
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   238
        """Returns the single namespace bound to this name.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   239
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset
   240
        Raises ValueError if the name is bound to multiple namespaces.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   241
        """
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   242
        if len(self.__namespaces) != 1:
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   243
            raise ValueError, "name is bound to multiple namespaces"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   244
        return self.__namespaces[0]
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   245
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   246
if __name__ == "__main__":
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   247
    import os, sys
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   248
    src = open(sys.argv[0]).read()
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   249
    mod = symtable(src, os.path.split(sys.argv[0])[1], "exec")
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   250
    for ident in mod.get_identifiers():
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   251
        info = mod.lookup(ident)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   252
        print info, info.is_local(), info.is_namespace()