324 lines
9.2 KiB
Python
324 lines
9.2 KiB
Python
|
class BaseStemmer(object):
|
||
|
|
def __init__(self):
|
||
|
|
self.set_current("")
|
||
|
|
|
||
|
|
def set_current(self, value):
|
||
|
|
'''
|
||
|
|
Set the self.current string.
|
||
|
|
'''
|
||
|
|
self.current = value
|
||
|
|
self.cursor = 0
|
||
|
|
self.limit = len(self.current)
|
||
|
|
self.limit_backward = 0
|
||
|
|
self.bra = self.cursor
|
||
|
|
self.ket = self.limit
|
||
|
|
|
||
|
|
def get_current(self):
|
||
|
|
'''
|
||
|
|
Get the self.current string.
|
||
|
|
'''
|
||
|
|
return self.current
|
||
|
|
|
||
|
|
def copy_from(self, other):
|
||
|
|
self.current = other.current
|
||
|
|
self.cursor = other.cursor
|
||
|
|
self.limit = other.limit
|
||
|
|
self.limit_backward = other.limit_backward
|
||
|
|
self.bra = other.bra
|
||
|
|
self.ket = other.ket
|
||
|
|
|
||
|
|
def in_grouping(self, s, min, max):
|
||
|
|
if self.cursor >= self.limit:
|
||
|
|
return False
|
||
|
|
ch = ord(self.current[self.cursor])
|
||
|
|
if ch > max or ch < min:
|
||
|
|
return False
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0x1 << (ch & 0x7))) == 0:
|
||
|
|
return False
|
||
|
|
self.cursor += 1
|
||
|
|
return True
|
||
|
|
|
||
|
|
def go_in_grouping(self, s, min, max):
|
||
|
|
while self.cursor < self.limit:
|
||
|
|
ch = ord(self.current[self.cursor])
|
||
|
|
if ch > max or ch < min:
|
||
|
|
return True
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0x1 << (ch & 0x7))) == 0:
|
||
|
|
return True
|
||
|
|
self.cursor += 1
|
||
|
|
return False
|
||
|
|
|
||
|
|
def in_grouping_b(self, s, min, max):
|
||
|
|
if self.cursor <= self.limit_backward:
|
||
|
|
return False
|
||
|
|
ch = ord(self.current[self.cursor - 1])
|
||
|
|
if ch > max or ch < min:
|
||
|
|
return False
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0x1 << (ch & 0x7))) == 0:
|
||
|
|
return False
|
||
|
|
self.cursor -= 1
|
||
|
|
return True
|
||
|
|
|
||
|
|
def go_in_grouping_b(self, s, min, max):
|
||
|
|
while self.cursor > self.limit_backward:
|
||
|
|
ch = ord(self.current[self.cursor - 1])
|
||
|
|
if ch > max or ch < min:
|
||
|
|
return True
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0x1 << (ch & 0x7))) == 0:
|
||
|
|
return True
|
||
|
|
self.cursor -= 1
|
||
|
|
return False
|
||
|
|
|
||
|
|
def out_grouping(self, s, min, max):
|
||
|
|
if self.cursor >= self.limit:
|
||
|
|
return False
|
||
|
|
ch = ord(self.current[self.cursor])
|
||
|
|
if ch > max or ch < min:
|
||
|
|
self.cursor += 1
|
||
|
|
return True
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0X1 << (ch & 0x7))) == 0:
|
||
|
|
self.cursor += 1
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
def go_out_grouping(self, s, min, max):
|
||
|
|
while self.cursor < self.limit:
|
||
|
|
ch = ord(self.current[self.cursor])
|
||
|
|
if ch <= max and ch >= min:
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0X1 << (ch & 0x7))):
|
||
|
|
return True
|
||
|
|
self.cursor += 1
|
||
|
|
return False
|
||
|
|
|
||
|
|
def out_grouping_b(self, s, min, max):
|
||
|
|
if self.cursor <= self.limit_backward:
|
||
|
|
return False
|
||
|
|
ch = ord(self.current[self.cursor - 1])
|
||
|
|
if ch > max or ch < min:
|
||
|
|
self.cursor -= 1
|
||
|
|
return True
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0X1 << (ch & 0x7))) == 0:
|
||
|
|
self.cursor -= 1
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
def go_out_grouping_b(self, s, min, max):
|
||
|
|
while self.cursor > self.limit_backward:
|
||
|
|
ch = ord(self.current[self.cursor - 1])
|
||
|
|
if ch <= max and ch >= min:
|
||
|
|
ch -= min
|
||
|
|
if (s[ch >> 3] & (0X1 << (ch & 0x7))):
|
||
|
|
return True
|
||
|
|
self.cursor -= 1
|
||
|
|
return False
|
||
|
|
|
||
|
|
def eq_s(self, s):
|
||
|
|
if self.limit - self.cursor < len(s):
|
||
|
|
return False
|
||
|
|
if self.current[self.cursor:self.cursor + len(s)] != s:
|
||
|
|
return False
|
||
|
|
self.cursor += len(s)
|
||
|
|
return True
|
||
|
|
|
||
|
|
def eq_s_b(self, s):
|
||
|
|
if self.cursor - self.limit_backward < len(s):
|
||
|
|
return False
|
||
|
|
if self.current[self.cursor - len(s):self.cursor] != s:
|
||
|
|
return False
|
||
|
|
self.cursor -= len(s)
|
||
|
|
return True
|
||
|
|
|
||
|
|
def find_among(self, v):
|
||
|
|
i = 0
|
||
|
|
j = len(v)
|
||
|
|
|
||
|
|
c = self.cursor
|
||
|
|
l = self.limit
|
||
|
|
|
||
|
|
common_i = 0
|
||
|
|
common_j = 0
|
||
|
|
|
||
|
|
first_key_inspected = False
|
||
|
|
|
||
|
|
while True:
|
||
|
|
k = i + ((j - i) >> 1)
|
||
|
|
diff = 0
|
||
|
|
common = min(common_i, common_j) # smaller
|
||
|
|
w = v[k]
|
||
|
|
for i2 in range(common, len(w.s)):
|
||
|
|
if c + common == l:
|
||
|
|
diff = -1
|
||
|
|
break
|
||
|
|
diff = ord(self.current[c + common]) - ord(w.s[i2])
|
||
|
|
if diff != 0:
|
||
|
|
break
|
||
|
|
common += 1
|
||
|
|
if diff < 0:
|
||
|
|
j = k
|
||
|
|
common_j = common
|
||
|
|
else:
|
||
|
|
i = k
|
||
|
|
common_i = common
|
||
|
|
if j - i <= 1:
|
||
|
|
if i > 0:
|
||
|
|
break # v->s has been inspected
|
||
|
|
if j == i:
|
||
|
|
break # only one item in v
|
||
|
|
# - but now we need to go round once more to get
|
||
|
|
# v->s inspected. This looks messy, but is actually
|
||
|
|
# the optimal approach.
|
||
|
|
if first_key_inspected:
|
||
|
|
break
|
||
|
|
first_key_inspected = True
|
||
|
|
while True:
|
||
|
|
w = v[i]
|
||
|
|
if common_i >= len(w.s):
|
||
|
|
self.cursor = c + len(w.s)
|
||
|
|
if w.method is None:
|
||
|
|
return w.result
|
||
|
|
method = getattr(self, w.method)
|
||
|
|
res = method()
|
||
|
|
self.cursor = c + len(w.s)
|
||
|
|
if res:
|
||
|
|
return w.result
|
||
|
|
i = w.substring_i
|
||
|
|
if i < 0:
|
||
|
|
return 0
|
||
|
|
return -1 # not reachable
|
||
|
|
|
||
|
|
def find_among_b(self, v):
|
||
|
|
'''
|
||
|
|
find_among_b is for backwards processing. Same comments apply
|
||
|
|
'''
|
||
|
|
i = 0
|
||
|
|
j = len(v)
|
||
|
|
|
||
|
|
c = self.cursor
|
||
|
|
lb = self.limit_backward
|
||
|
|
|
||
|
|
common_i = 0
|
||
|
|
common_j = 0
|
||
|
|
|
||
|
|
first_key_inspected = False
|
||
|
|
|
||
|
|
while True:
|
||
|
|
k = i + ((j - i) >> 1)
|
||
|
|
diff = 0
|
||
|
|
common = min(common_i, common_j)
|
||
|
|
w = v[k]
|
||
|
|
for i2 in range(len(w.s) - 1 - common, -1, -1):
|
||
|
|
if c - common == lb:
|
||
|
|
diff = -1
|
||
|
|
break
|
||
|
|
diff = ord(self.current[c - 1 - common]) - ord(w.s[i2])
|
||
|
|
if diff != 0:
|
||
|
|
break
|
||
|
|
common += 1
|
||
|
|
if diff < 0:
|
||
|
|
j = k
|
||
|
|
common_j = common
|
||
|
|
else:
|
||
|
|
i = k
|
||
|
|
common_i = common
|
||
|
|
if j - i <= 1:
|
||
|
|
if i > 0:
|
||
|
|
break
|
||
|
|
if j == i:
|
||
|
|
break
|
||
|
|
if first_key_inspected:
|
||
|
|
break
|
||
|
|
first_key_inspected = True
|
||
|
|
while True:
|
||
|
|
w = v[i]
|
||
|
|
if common_i >= len(w.s):
|
||
|
|
self.cursor = c - len(w.s)
|
||
|
|
if w.method is None:
|
||
|
|
return w.result
|
||
|
|
method = getattr(self, w.method)
|
||
|
|
res = method()
|
||
|
|
self.cursor = c - len(w.s)
|
||
|
|
if res:
|
||
|
|
return w.result
|
||
|
|
i = w.substring_i
|
||
|
|
if i < 0:
|
||
|
|
return 0
|
||
|
|
return -1 # not reachable
|
||
|
|
|
||
|
|
def replace_s(self, c_bra, c_ket, s):
|
||
|
|
'''
|
||
|
|
to replace chars between c_bra and c_ket in self.current by the
|
||
|
|
chars in s.
|
||
|
|
|
||
|
|
@type c_bra int
|
||
|
|
@type c_ket int
|
||
|
|
@type s: string
|
||
|
|
'''
|
||
|
|
adjustment = len(s) - (c_ket - c_bra)
|
||
|
|
self.current = self.current[0:c_bra] + s + self.current[c_ket:]
|
||
|
|
self.limit += adjustment
|
||
|
|
if self.cursor >= c_ket:
|
||
|
|
self.cursor += adjustment
|
||
|
|
elif self.cursor > c_bra:
|
||
|
|
self.cursor = c_bra
|
||
|
|
return adjustment
|
||
|
|
|
||
|
|
def slice_check(self):
|
||
|
|
if self.bra < 0 or self.bra > self.ket or self.ket > self.limit or self.limit > len(self.current):
|
||
|
|
return False
|
||
|
|
return True
|
||
|
|
|
||
|
|
def slice_from(self, s):
|
||
|
|
'''
|
||
|
|
@type s string
|
||
|
|
'''
|
||
|
|
result = False
|
||
|
|
if self.slice_check():
|
||
|
|
self.replace_s(self.bra, self.ket, s)
|
||
|
|
result = True
|
||
|
|
return result
|
||
|
|
|
||
|
|
def slice_del(self):
|
||
|
|
return self.slice_from("")
|
||
|
|
|
||
|
|
def insert(self, c_bra, c_ket, s):
|
||
|
|
'''
|
||
|
|
@type c_bra int
|
||
|
|
@type c_ket int
|
||
|
|
@type s: string
|
||
|
|
'''
|
||
|
|
adjustment = self.replace_s(c_bra, c_ket, s)
|
||
|
|
if c_bra <= self.bra:
|
||
|
|
self.bra += adjustment
|
||
|
|
if c_bra <= self.ket:
|
||
|
|
self.ket += adjustment
|
||
|
|
|
||
|
|
def slice_to(self):
|
||
|
|
'''
|
||
|
|
Return the slice as a string.
|
||
|
|
'''
|
||
|
|
result = ''
|
||
|
|
if self.slice_check():
|
||
|
|
result = self.current[self.bra:self.ket]
|
||
|
|
return result
|
||
|
|
|
||
|
|
def assign_to(self):
|
||
|
|
'''
|
||
|
|
Return the current string up to the limit.
|
||
|
|
'''
|
||
|
|
return self.current[0:self.limit]
|
||
|
|
|
||
|
|
def stemWord(self, word):
|
||
|
|
self.set_current(word)
|
||
|
|
self._stem()
|
||
|
|
return self.get_current()
|
||
|
|
|
||
|
|
def stemWords(self, words):
|
||
|
|
return [self.stemWord(word) for word in words]
|