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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of moses. Its use is licensed under the GNU Lesser General
# Public License version 2.1 or, at your option, any later version.
"""
Python utilities for moses
This package mostly wraps standard Moses utilities into pipes.
Written by Ulrich Germann
This package borrows from scripts written by Christian Buck
The package assumes that there is a complete moses installation
(including scripts) under one root directory,
e.g., via ::
bjam --with-xmlrpc-c=... [...] --install-scripts --prefix=${HOME}/moses
By default, this root directory is "${HOME}/moses".
"""
import os
import sys
import time
import xmlrpclib
from subprocess import (
PIPE,
Popen,
)
moses_root = os.environ.get('MOSES_ROOT', os.environ.get('HOME') + "/moses")
class ProcessWrapper:
def __init__(self, cmd=[]):
self.process = None
self.cmd = cmd
def start(self, stdin=PIPE, stdout=PIPE):
if self.process:
raise Exception("Process is already running")
self.process = Popen(self.cmd, stdin=stdin, stdout=stdout)
def __del__(self):
if self.process:
self.process.terminate()
class LineProcessor(ProcessWrapper):
def __call__(self, input):
if not self.process:
self.start()
self.process.stdin.write("%s\n" % input.strip())
self.process.stdin.flush()
return self.process.stdout.readline().strip()
class SentenceSplitter(ProcessWrapper):
"""Wrapper for standard Moses sentence splitter."""
def __init__(self, lang):
ssplit_cmd = moses_root + "/scripts/ems/support/split-sentences.perl"
self.cmd = [ssplit_cmd, "-b", "-q", "-l", lang]
self.process = None
def __call__(self, input):
if not self.process:
self.start()
self.process.stdin.write(input.strip() + "\n<P>\n")
self.process.stdin.flush()
x = self.process.stdout.readline().strip()
ret = []
while x != '<P>' and x != '':
ret.append(x)
x = self.process.stdout.readline().strip()
return ret
class Pretokenizer(LineProcessor):
"""Pretokenizer wrapper.
The pretokenizer fixes known issues with the input.
"""
def __init__(self, lang):
pretok_cmd = moses_root + "/scripts/tokenizer/pre-tokenizer.perl"
self.cmd = [pretok_cmd, "-b", "-q", "-l", lang]
self.process = None
class Tokenizer(LineProcessor):
"""Tokenizer wrapper.
The pretokenizer fixes known issues with the input.
"""
def __init__(self, lang, args=["-a", "-no-escape"]):
tok_cmd = moses_root + "/scripts/tokenizer/tokenizer.perl"
self.cmd = [tok_cmd, "-b", "-q", "-l", lang] + args
self.process = None
class Truecaser(LineProcessor):
"""Truecaser wrapper."""
def __init__(self, model):
truecase_cmd = moses_root + "/scripts/recaser/truecase.perl"
self.cmd = [truecase_cmd, "-b", "--model", model]
self.process = None
class LineProcessorPipeline:
"""Line processor: one line in, one line out."""
def __init__(self, parts=[]):
self.chain = [LineProcessor(p.cmd) for p in parts]
def start(self):
if len(self.chain) == 0:
return
if self.chain[0].process:
return
self.chain[0].start()
for i in xrange(1, len(self.chain)):
self.chain[i].start(stdin=self.chain[i - 1].process.stdout)
def __call__(self, input):
if len(self.chain) == 0:
return input
self.start()
self.chain[0].process.stdin.write("%s\n" % input.strip())
self.chain[0].process.stdin.flush()
return self.chain[0].process.stdout.readline().strip()
def find_free_port(p):
"""Find a free port, starting at /p/.
:return: The free port, or False if none found.
"""
ret = p
while ret - p < 20:
devnull = open(os.devnull, "w")
n = Popen(["netstat", "-tnp"], stdout=PIPE, stderr=devnull)
if n.communicate()[0].find(":%d " % ret) < 0:
return p
ret += 1
return False
class MosesServer(ProcessWrapper):
def __init__(self, args=[]):
self.process = None
mserver_cmd = moses_root + "/bin/mosesserver"
self.cmd = [mserver_cmd] + args
self.url = None
self.proxy = None
def start(self, config=None, args=[], port=7447, debug=False):
self.cmd.extend(args)
if config:
if "-f" in args:
raise Exception("Config file specified twice")
else:
self.cmd.extend(["-f", config])
self.port = port # find_free_port(port)
if not self.port:
raise Exception("Cannot find free port for moses server!")
self.cmd.extend(["--server-port", "%d" % self.port])
if debug:
print >>sys.stderr, self.cmd
# self.stderr = open("mserver.%d.stderr"%self.port,'w')
# self.stdout = open("mserver.%d.stdout"%self.port,'w')
# self.process = Popen(
# self.cmd, stderr=self.stderr, stdout=self.stdout)
self.process = Popen(self.cmd)
else:
devnull = open(os.devnull, "w")
self.process = Popen(self.cmd, stderr=devnull, stdout=devnull)
if self.process.poll():
raise Exception("FATAL ERROR: Could not launch moses server!")
if debug:
print >>sys.stderr, "MOSES port is %d." % self.port
print >>sys.stderr, "Moses poll status is", self.process.poll()
self.url = "http://localhost:%d/RPC2" % self.port
self.connect(self.url)
return True
def connect(self, url):
if url[:4] != "http":
url = "http://%s" % url
if url[-5:] != "/RPC2":
url += "/RPC2"
self.url = url
self.proxy = xmlrpclib.ServerProxy(self.url)
def translate(self, input):
attempts = 0
while attempts < 100:
try:
if type(input) is unicode:
# If the server does not expect unicode, provide a
# properly encoded string!
param = {'text': input.strip().encode('utf8')}
return self.proxy.translate(param)['text'].decode('utf8')
elif type(input) is str:
param = {'text': input.strip()}
return self.proxy.translate(param)['text']
elif type(input) is list:
return [self.translate(x) for x in input]
elif type(input) is dict:
return self.proxy.translate(input)
else:
raise Exception("Can't handle input of this type!")
except:
attempts += 1
print >>sys.stderr, "WAITING", attempts
time.sleep(1)
raise Exception("Translation request failed")
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