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#!/usr/bin/python
# -*- coding: UTF-8 -*-
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
#
# Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
#
# The contents of this file are subject to the terms of either the GNU Lesser
# General Public License Version 2.1 only ("LGPL") or the Common Development and
# Distribution License ("CDDL")(collectively, the "License"). You may not use this
# file except in compliance with the License. You can obtain a copy of the CDDL at
# http://www.opensource.org/licenses/cddl1.php and a copy of the LGPLv2.1 at
# http://www.opensource.org/licenses/lgpl-license.php. See the License for the
# specific language governing permissions and limitations under the License. When
# distributing the software, include this License Header Notice in each file and
# include the full text of the License in the License file as well as the
# following notice:
#
# NOTICE PURSUANT TO SECTION 9 OF THE COMMON DEVELOPMENT AND DISTRIBUTION LICENSE
# (CDDL)
# For Covered Software in this distribution, this License shall be governed by the
# laws of the State of California (excluding conflict-of-law provisions).
# Any litigation relating to this License shall be subject to the jurisdiction of
# the Federal Courts of the Northern District of California and the state courts
# of the State of California, with venue lying in Santa Clara County, California.
#
# Contributor(s):
#
# If you wish your version of this file to be governed by only the CDDL or only
# the LGPL Version 2.1, indicate your decision by adding "[Contributor]" elects to
# include this software in this distribution under the [CDDL or LGPL Version 2.1]
# license." If you don't indicate a single choice of license, a recipient has the
# option to distribute your version of this file under either the CDDL or the LGPL
# Version 2.1, or to extend the choice of license to its licensees as provided
# above. However, if you add LGPL Version 2.1 code and therefore, elected the LGPL
# Version 2 license, then the option applies only if the new code is made subject
# to such option by the copyright holder.
import os
import mmap
import struct
import heapq
import tempfile
class NGram:
key = ()
freq = 0
def __init__(self, key, freq):
self.key = key
self.freq = freq
def __cmp__(self,other):
return cmp(self.key, other.key)
def __str__(self):
return "ngram: " + self.key.__str__() + " freq: " + str(self.freq)
def read_ch_sentences(file):
buf = []
for line in file:
if buf and (line[0].isspace() or len(buf) <= 40):
yield ''.join(buf)
buf = []
for ch in line:
if ch.isspace() or ch == u'—':
continue
if ch in u"；。！？…—":
if buf:
buf.append(ch)
yield ''.join (buf)
buf = []
else:
buf.append (ch)
if buf:
yield ''.join (buf)
def mergesort (iters):
heap=[]
for it in iters:
try:
heap.append((it.next(), it))
except StopIteration:
pass
heapq.heapify(heap)
while heap:
val, it = heap[0]
yield val
try:
heapq.heapreplace(heap, (it.next(),it))
except StopIteration:
heapq.heappop(heap)
def read_ngrams (fname, n):
file = open(fname, "r")
fsize = os.path.getsize(fname)
mem = mmap.mmap(file.fileno(), fsize, mmap.MAP_SHARED, mmap.PROT_READ)
while True:
ngram = mem.read((n+1)*4)
if ngram:
data = struct.unpack('%dl' % (n+1), ngram)
yield NGram(data[:n], data[n])
else:
break
mem.close()
file.close()
class MMArray:
__file = __mem = None
__realsize = __capsize = 0
def __init__(self, elmsize=1, fname=None, capsize=1024*1024):
self.__elmsize = elmsize
if not fname:
fno, self.__fname = tempfile.mkstemp("-mmarray", "pyslm-")
self.__file = os.fdopen (fno, "w+")
self.__enlarge(capsize)
else:
self.fromfile(fname)
def fromfile(self, fname):
if not os.path.exists(fname):
raise "The file '%s' does not exist!"
fsize = os.path.getsize(fname)
if fsize == 0:
raise "The size of file '%s' is zero!" % fname
if self.__mem: self.__mem.close()
if self.__file: self.__file.close()
self.__file = open (fname, "r+")
self.__mem = mmap.mmap(self.__file.fileno(), fsize)
self.__realsize = self.__capsize = fsize/self.__elmsize
def tofile(self, fname):
if fname == self.__file.name:
raise "Can not dump the array to currently mapping file!"
tf = open(fname, "w+")
bsize = self.__realsize * self.__elmsize
tf.write (self.__mem[:bsize])
tf.close()
def __enlarge(self, capsize):
if self.__capsize >= capsize:
return
self.__capsize = capsize
self.__file.seek(self.__elmsize * self.__capsize - 1)
self.__file.write('\0')
self.__file.flush()
if (self.__mem): self.__mem.close()
self.__mem = mmap.mmap(self.__file.fileno(), self.__file.tell())
def __del__ (self):
bsize = self.__realsize * self.__elmsize
self.__file.truncate (bsize)
self.__file.close()
if self.__mem: self.__mem.close()
os.remove(self.__fname)
def __getitem__(self, idx):
if idx < -self.__realsize or idx >= self.__realsize:
raise IndexError
return self.__access(idx)
def __setitem__(self, idx, buf):
if idx < -self.__realsize or idx >= self.__realsize:
raise IndexError
if type(buf) != type("") or len(buf) != self.__elmsize:
raise "Not a string, or the buffer size is incorrect!"
self.__access(idx, buf)
def __access (self, idx, buf=None):
if idx < 0: idx = self.__realsize + idx
start = idx * self.__elmsize
end = start + self.__elmsize
if not buf: return self.__mem[start:end]
self.__mem[start:end] = buf
def size(self):
return self.__realsize
def append(self, buf):
if type(buf) != type("") or len(buf) != self.__elmsize:
raise "Not a string, or the buffer size is incorrect!"
if self.__realsize >= self.__capsize:
self.__enlarge(self.__capsize*2)
self.__access(self.__realsize, buf)
self.__realsize += 1
def __iter__(self):
for i in xrange(0, self.__realsize):
yield self.__access(i)
def truncate(self, tsize):
if self.__realsize >= tsize:
self.__realsize = tsize
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