mdw@git.distorted.org.uk Git - mLib-python/blob - sym.pyx

   1 ### -*-pyrex-*-
   2 ###
   3 ### Symbol table, using universal hashing
   4 ###
   5 ### (c) 2005 Straylight/Edgeware
   6 ###
   7
   8 ###----- Licensing notice ---------------------------------------------------
   9 ###
  10 ### This file is part of the Python interface to mLib.
  11 ###
  12 ### mLib/Python is free software; you can redistribute it and/or modify
  13 ### it under the terms of the GNU General Public License as published by
  14 ### the Free Software Foundation; either version 2 of the License, or
  15 ### (at your option) any later version.
  16 ###
  17 ### mLib/Python is distributed in the hope that it will be useful,
  18 ### but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ### GNU General Public License for more details.
  21 ###
  22 ### You should have received a copy of the GNU General Public License
  23 ### along with mLib/Python; if not, write to the Free Software Foundation,
  24 ### Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25
  26 cdef struct _sym_entry:
  27   sym_base _b
  28   PyObject *v
  29
  30 cdef class SymTable (_Mapping):
  31   """
  32   SymTable([DICT], **KW)
  33
  34   A mapping keyed by strings.
  35   """
  36   cdef sym_table _t
  37   def __cinit__(me):
  38     sym_create(&me._t)
  39   cdef int _init(me) except -1:
  40     return 0
  41   cdef void *_find(me, object key, unsigned *f) except NULL:
  42     cdef const char *p
  43     cdef Py_ssize_t n
  44     cdef _sym_entry *e = NULL
  45     TEXT_PTRLEN(key, &p, &n)
  46     if not f:
  47       e = <_sym_entry *>sym_find(&me._t, <char *>p, n, 0, NULL)
  48       if not e:
  49         raise KeyError(key)
  50     else:
  51       e = <_sym_entry *>sym_find(&me._t, <char *>p, n, PSIZEOF(e), f)
  52       if not f[0]:
  53         e.v = NULL
  54     return <void *>e
  55   cdef object _key(me, void *e):
  56     return TEXT_FROMSTRLEN(SYM_NAME(e), SYM_LEN(e))
  57   cdef object _value(me, void *e):
  58     cdef _sym_entry *ee = <_sym_entry *>e
  59     Py_INCREF(ee.v)
  60     return <object>ee.v
  61   cdef void _setval(me, void *e, object val):
  62     cdef _sym_entry *ee = <_sym_entry *>e
  63     if ee.v:
  64       Py_DECREF(ee.v)
  65     ee.v = <PyObject *>val
  66     Py_INCREF(ee.v)
  67   cdef void _del(me, void *e):
  68     cdef _sym_entry *ee = <_sym_entry *>e
  69     if ee.v:
  70       Py_DECREF(ee.v)
  71     sym_remove(&me._t, <void *>ee)
  72   cdef _MapIterator _iter(me):
  73     return _SymIter(me)
  74
  75 cdef class _SymIter (_MapIterator):
  76   cdef SymTable t
  77   cdef sym_iter i
  78   def __cinit__(me, SymTable t not None):
  79     me.t = t
  80     sym_mkiter(&me.i, &me.t._t)
  81   cdef void *_next(me):
  82     return sym_next(&me.i)
  83
  84 ###----- That's all, folks --------------------------------------------------