encode.py
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'''
Created on Oct 23, 2013
@author: mlenart
'''
import logging
import itertools
from morfeuszbuilder.utils.serializationUtils import *
class Encoder(object):
'''
classdocs
'''
def __init__(self, lowercase, encoding='utf8'):
'''
Constructor
'''
self.lowercase = lowercase
self.encoding = encoding
self.qualifiersMap = { frozenset(): 0}
def encodeWord(self, word, lowercase=True):
assert type(word) == unicode
res = bytearray(word.lower() if self.lowercase and lowercase else word, self.encoding)
return res
def encodeData(self, data):
raise NotImplementedError()
def decodeData(self, rawData):
return NotImplementedError()
def decodeWord(self, rawWord):
return unicode(str(rawWord).strip('\x00'), self.encoding)
def word2SortKey(self, word):
normalizedWord = word.lower() if self.lowercase else word
return normalizedWord.encode(self.encoding)
def _encodeTypeNum(self, typenum):
assert typenum >= 0 and typenum < 256
return bytearray([typenum])
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 _encodeQualifiers(self, qualifiers):
res = bytearray()
key = frozenset(qualifiers)
if key in self.qualifiersMap:
n = self.qualifiersMap[key]
else:
n = len(self.qualifiersMap)
self.qualifiersMap[key] = n
assert n < 500
res.extend(htons(n))
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()
assert tagnum < 65536 and tagnum >= 0
res.append((tagnum & 0xFF00) >> 8)
res.append(tagnum & 0x00FF)
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 _getOrthCasePatterns(self, interpsList):
res = []
for interp in interpsList:
if not True in interp.orthCasePattern:
return []
else:
res.append(list(interp.orthCasePattern))
return res
def _encodeInterps4Type(self, typenum, interpsList, isAnalyzer):
res = bytearray()
res.extend(self._encodeTypeNum(typenum))
encodedInterpsList = bytearray()
if isAnalyzer:
casePatterns = self._getOrthCasePatterns(interpsList)
encodedInterpsList.append(len(casePatterns))
for casePattern in casePatterns:
encodedInterpsList.extend(self._encodeCasePattern(casePattern))
for interp in sorted(interpsList, key=lambda i: i.getSortKey()):
if isAnalyzer:
encodedInterpsList.extend(self._encodeCasePattern(interp.orthCasePattern))
else:
serializeString(interp.homonymId, encodedInterpsList)
serializeString(interp.encodedForm.prefixToAdd, encodedInterpsList)
encodedInterpsList.append(interp.encodedForm.cutLength)
serializeString(interp.encodedForm.suffixToAdd, encodedInterpsList)
if isAnalyzer:
encodedInterpsList.extend(self._encodeCasePattern(interp.encodedForm.casePattern))
encodedInterpsList.extend(htons(interp.tagnum))
encodedInterpsList.append(interp.namenum)
encodedInterpsList.extend(self._encodeQualifiers(interp.qualifiers))
if interp.encodedForm.suffixToAdd == 'bc':
print len(interpsList), interp.encodedForm.suffixToAdd, [int(x) for x in encodedInterpsList]
res.extend(htons(len(encodedInterpsList)))
res.extend(encodedInterpsList)
return res
def _doEncodeData(self, interpsList, isAnalyzer):
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, isAnalyzer))
del interpsList
return res
class MorphEncoder(Encoder):
def __init__(self, encoding='utf8'):
super(MorphEncoder, self).__init__(True, encoding)
self.LEMMA_ONLY_LOWER = 0
self.LEMMA_UPPER_PREFIX = 1
self.LEMMA_MIXED_CASE = 2
def encodeData(self, interpsList):
return self._doEncodeData(interpsList, isAnalyzer=True)
class Encoder4Generator(Encoder):
def __init__(self, encoding='utf8'):
super(Encoder4Generator, self).__init__(False, encoding)
def encodeData(self, interpsList):
return self._doEncodeData(interpsList, isAnalyzer=False)