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

   1 ### -*-pyrex-*-
   2 ###
   3 ### Selecting line-buffers
   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 class SelLineBuffer:
  27   """
  28   SelLineBuffer(FILE, [lineproc = None], [eofproc = None])
  29
  30   Split an asynchronous stream into lines.
  31   """
  32   cdef selbuf b
  33   cdef _line
  34   cdef _eof
  35   def __cinit__(me, fd, lineproc = None, eofproc = None, *hunoz, **hukairz):
  36     selbuf_init(&me.b, &_sel, _getfd(fd), _selbfunc, <void *>me)
  37     selbuf_disable(&me.b)
  38     me._line = _checkcallable(lineproc, 'line proc')
  39     me._eof = _checkcallable(eofproc, 'eof proc')
  40   def __dealloc__(me):
  41     selbuf_destroy(&me.b)
  42   property activep:
  43     """SLB.activep -> BOOL: is the buffer still active?"""
  44     def __get__(me):
  45       return _tobool(me.b.b.f & LBUF_ENABLE)
  46   property fd:
  47     """SLB.fd -> INT: the file descriptor"""
  48     def __get__(me):
  49       return me.b.reader.fd
  50   property delim:
  51     """SLB.delim -> CHAR | LBUF_...: line-end delimiter"""
  52     def __get__(me):
  53       if me.b.b.delim == _LBUF_CRLF or me.b.b.delim == _LBUF_STRICTCRLF:
  54         return me.b.b.delim
  55       else:
  56         return chr(me.b.b.delim)
  57     def __set__(me, d):
  58       if d == _LBUF_CRLF or d == _LBUF_STRICTCRLF:
  59         me.b.b.delim = d
  60       else:
  61         me.b.b.delim = ord(d)
  62   property size:
  63     """SLB.size -> INT: buffer size limit"""
  64     def __get__(me):
  65       return me.b.b.sz
  66     def __set__(me, sz):
  67       if sz <= 0:
  68         raise TypeError, 'size must be positive'
  69       selbuf_setsize(&me.b, sz)
  70   property lineproc:
  71     """SLB.lineproc -> FUNC: call FUNC(LINE) on each line"""
  72     def __get__(me):
  73       return me._line
  74     def __set__(me, proc):
  75       me._line = _checkcallable(proc, 'line proc')
  76     def __del__(me):
  77       me._line = None
  78   property eofproc:
  79     """SLB.eofproc -> FUNC: call FUNC() at end-of-file"""
  80     def __get__(me):
  81       return me._eof
  82     def __set__(me, proc):
  83       me._eof = _checkcallable(proc, 'eof proc')
  84     def __del__(me):
  85       me._eof = None
  86   def enable(me):
  87     """SLB.enable(): enable the buffer, allowing lines to be emitted"""
  88     if me.b.b.f & LBUF_ENABLE:
  89       raise ValueError, 'already enabled'
  90     selbuf_enable(&me.b)
  91     me.enabled()
  92     return me
  93   def disable(me):
  94     """SLB.disable(): disable the buffer, suspending line emission"""
  95     if not (me.b.b.f & LBUF_ENABLE):
  96       raise ValueError, 'already disabled'
  97     selbuf_disable(&me.b)
  98     me.disabled()
  99     return me
 100   def enabled(me):
 101     """SLB.enabled(): called when buffer is enabled"""
 102     pass
 103   def disabled(me):
 104     """SLB.disabled(): called when buffer is disabled"""
 105     pass
 106   def line(me, line):
 107     """SLB.line(LINE): called for each completed line"""
 108     return _maybecall(me._line, (line,))
 109   def eof(me):
 110     """SLB.eof(): called at end-of-file"""
 111     return _maybecall(me._eof, ())
 112
 113 cdef void _selbfunc(char *s, size_t n, void *arg):
 114   cdef SelLineBuffer sb
 115   sb = <SelLineBuffer>arg
 116   if s is NULL:
 117     sb.eof()
 118   else:
 119     sb.line(PyString_FromStringAndSize(s, n))
 120
 121 ###----- That's all, folks --------------------------------------------------