encode.py
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'''
Created on Oct 23, 2013
@author: mlenart
'''
import logging
from morfeuszbuilder.utils import serializationUtils
class Encoder(object):
'''
classdocs
'''
def __init__(self, encoding='utf8'):
'''
Constructor
'''
self.encoding = encoding
def encodeWord(self, word, lowercase=True):
assert type(word) == unicode
res = bytearray(word.lower() if lowercase else word, self.encoding)
return res
def encodeData(self, data):
raise NotImplementedError()
# return bytearray(u'|'.join(data).encode(self.encoding)) + bytearray([0])
def decodeData(self, rawData):
return NotImplementedError()
def decodeWord(self, rawWord):
return unicode(str(rawWord).strip('\x00'), self.encoding)
def word2SortKey(self, word):
return word.lower().encode(self.encoding)
def _encodeTypeNum(self, typenum):
assert typenum >= 0 and typenum < 256
return bytearray([typenum])
def _encodeEncodedForm(self, form, withCasePattern, withPrefix=False):
res = bytearray()
assert form.cutLength < 256 and form.cutLength >= 0
if withPrefix:
res.extend(self.encodeWord(form.prefixToAdd, lowercase=False))
res.append(0)
res.append(form.cutLength)
res.extend(self.encodeWord(form.suffixToAdd, lowercase=False))
res.append(0)
if withCasePattern:
res.extend(self._encodeCasePattern(form.casePattern))
return res
def _encodeCasePattern(self, casePattern):
res = bytearray()
if True not in casePattern:
res.append(self.LEMMA_ONLY_LOWER)
return res
elif self._hasUpperPrefix(casePattern):
res.append(self.LEMMA_UPPER_PREFIX)
res.append(self._getUpperPrefixLength(casePattern))
return res
else:
assert len(casePattern) < 256
res.append(self.LEMMA_MIXED_CASE)
res.append(len([c for c in casePattern if c]))
for idx in range(len(casePattern)):
if casePattern[idx]:
res.append(idx)
return res
def _hasUpperPrefix(self, casePattern):
for i in range(len(casePattern) + 1):
if all(casePattern[:i]) and not any(casePattern[i:]):
return True
return False
def _getUpperPrefixLength(self, casePattern):
assert self._hasUpperPrefix(casePattern)
for i in range(len(casePattern)):
if not casePattern[i]:
return i
return len(casePattern)
def _encodeTagNum(self, tagnum):
res = bytearray()
# logging.info((tagnum & 0xFF00) >> 8)
assert tagnum < 65536 and tagnum >= 0
res.append((tagnum & 0xFF00) >> 8)
res.append(tagnum & 0x00FF)
# logging.info('%d %s %s' % (tagnum, hex(res[0]), hex(res[1])))
return res
def _encodeNameNum(self, namenum):
assert namenum < 256 and namenum >= 0
return bytearray([namenum])
def _groupInterpsByType(self, interpsList):
res = {}
for interp in interpsList:
res.setdefault(interp.typenum, [])
res[interp.typenum].append(interp)
return res
def _encodeInterps4Type(self, typenum, interpsList, withCasePattern, withPrefix):
res = bytearray()
res.extend(self._encodeTypeNum(typenum))
encodedInterpsList = bytearray()
for interp in sorted(interpsList, key=lambda i: i.getSortKey()):
encodedInterpsList.extend(self._encodeEncodedForm(interp.encodedForm, withCasePattern=withCasePattern, withPrefix=withPrefix))
encodedInterpsList.extend(self._encodeTagNum(interp.tagnum))
encodedInterpsList.extend(self._encodeNameNum(interp.namenum))
res.extend(serializationUtils.htons(len(encodedInterpsList)))
res.extend(encodedInterpsList)
return res
def _doEncodeData(self, interpsList, withCasePattern, withPrefix):
assert type(interpsList) == frozenset
segnum2Interps = self._groupInterpsByType(interpsList)
res = bytearray()
firstByte = len(segnum2Interps)
assert firstByte < 256
assert firstByte > 0
res.append(firstByte)
for typenum, interpsList in segnum2Interps.iteritems():
res.extend(self._encodeInterps4Type(typenum, interpsList, withCasePattern, withPrefix))
# for interp in sorted(interpsList, key=lambda i: i.getSortKey()):
# encodedInterpsList.extend(self._encodeTypeNum(interp.typenum))
# encodedInterpsList.extend(self._encodeEncodedForm(interp.encodedForm, withCasePattern=withCasePattern, withPrefix=withPrefix))
# encodedInterpsList.extend(self._encodeTagNum(interp.tagnum))
# encodedInterpsList.extend(self._encodeNameNum(interp.namenum))
del interpsList
# res.extend(serializationUtils.htons(len(encodedInterpsList)))
# res.extend(encodedInterpsList)
return res
class MorphEncoder(Encoder):
def __init__(self, encoding='utf8'):
super(MorphEncoder, self).__init__(encoding)
self.LEMMA_ONLY_LOWER = 0
self.LEMMA_UPPER_PREFIX = 1
self.LEMMA_MIXED_CASE = 2
def encodeData(self, interpsList):
return self._doEncodeData(interpsList, withCasePattern=True, withPrefix=False)
# res = bytearray()
# firstByte = len(interpsList)
# assert firstByte < 256
# assert firstByte > 0
# res.append(firstByte)
# assert type(interpsList) == frozenset
# for interp in sorted(interpsList, key=lambda i: i.getSortKey()):
# res.extend(self._encodeTypeNum(interp.typenum))
# res.extend(self._encodeEncodedForm(interp.encodedForm, withCasePattern=True, withPrefix=False))
# res.extend(self._encodeTagNum(interp.tagnum))
# res.extend(self._encodeNameNum(interp.namenum))
# del interpsList
# return res
class Encoder4Generator(Encoder):
def __init__(self, encoding='utf8'):
super(Encoder4Generator, self).__init__(encoding)
def encodeData(self, interpsList):
return self._doEncodeData(interpsList, withCasePattern=False, withPrefix=True)
# res = bytearray()
# firstByte = len(interpsList)
# assert firstByte < 256
# assert firstByte > 0
# res.append(firstByte)
# assert type(interpsList) == frozenset
# for interp in sorted(interpsList, key=lambda i: i.getSortKey()):
# res.extend(self._encodeTypeNum(interp.typenum))
# res.extend(self._encodeEncodedForm(interp.encodedForm, withCasePattern=False, withPrefix=True))
# res.extend(self._encodeTagNum(interp.tagnum))
# res.extend(self._encodeNameNum(interp.namenum))
# return res
#
# def decodeData(self, data):
#