def cal_firstVt(gram_list: list,Vn_list:list,Vt_list:list) -> 'firstVt_dict':
"""计算每一个终结符的firstVt--{'a': set({'abc''})}"""
# 初始化每一个终结符的firstVt集
firstVt_dict = {}
for v in Vn_list:
firstVt_dict[v] = set()
while True:
# 循坏开始前，记录每个非终结符的firstvt集的长度
len_list1 = len_dict(firstVt_dict)
for gene in gram_list:
# 产生式的右部含有终结符
if has_Vt(gene):
# 找出首个终结符
first_vt = list(filter(lambda x: not isupper(x),gene[1]))[0]
firstVt_dict[gene[0]].add(first_vt)
# 产生式右部为空的情况
elif gene[1] == '':
pass
else:
# 产生式的右部不含终结符
# 找出首个非终结符
first_vn = list(filter(lambda x: isupper(x),gene[1]))[0]
for char in firstVt_dict[first_vn]:
firstVt_dict[gene[0]].add(char)
# 循坏开始后，记录每个非终结符的firstvt集的长度
len_list2 = len_dict(firstVt_dict)
# 如果每个非终结符的firstvt集都没有再变化，则计算完毕
if len_list1 == len_list2:
break
print('firstVt集为:',firstVt_dict)
return firstVt_dict
def cal_select(gene_list: list, first_dict: dict,
follow_dict: dict) -> 'select_dict':
"""计算每一个产生式的select集(字典结构)：{'A->abc': set{'abc'}，}"""
# 初始化select集
select_dict = {}
# for gene in gene_list:
# temp_gene = '->'.join(gene)
# select_dict[temp_gene] = set()
for gene in gene_list:
temp_gene = '->'.join(gene)
select_dict[temp_gene] = set()
# 产生式右部为空
if gene[1] == '':
for char in follow_dict[gene[0]]:
select_dict[temp_gene].add(char)
# 产生式右部第一个符号为终结符
elif islower(gene[1][0]):
select_dict[temp_gene].add(gene[1][0])
# 产生式右部第一个符号为非终结符
elif isupper(gene[1][0]):
for v in gene[1]:
# 找到产生式右部首个一定不为空的符号的位置
# 初始化为最后一个符号
not_null_index = len(gene[1]) - 1
for i in range(1, len(gene[1])):
v = gene[1][i]
# 首个Vn不能推出空，或者能推出空后面的首个Vt
if isupper(v) and '' not in first_dict[v] or islower(v):
not_null_index = i
break
# 产生式的右部可推出空
if isupper(gene[1][not_null_index]) and not_null_index == len(
gene[1]) - 1 and '' in first_dict[gene[1]
[not_null_index]]:
for m in (0, len(gene[1])):
select_dict[temp_gene].add(first_dict[gene[1][m]])
select_dict[temp_gene] -= {''}
select_dict[temp_gene].add(follow_dict[gene[0]])
# 产生式的右部不可推出空
else:
for n in range(0, not_null_index + 1):
if islower(gene[1][n]):
select_dict[temp_gene].add(gene[1][n])
else:
if '' in first_dict[gene[1][n]]:
for char in first_dict[gene[1][n]]:
select_dict[temp_gene].add(char)
select_dict[temp_gene] -= {''}
else:
for char in first_dict[gene[1][n]]:
select_dict[temp_gene].add(char)
print('select集为：', select_dict)
return select_dict
def classify_status(gram_list: list,firstVt_dict,lastVt_dict) -> '[[set(),'>',set()]]':
"""计算终结符之间的关系"""
status_list = []
for gene in gram_list:
if len(gene[1]) >= 2:
for i in range(0,len(gene[1]) - 1):
if not isupper(gene[1][i]) and not isupper(gene[1][i + 1]):
temp_set1 = set()
temp_set2 = set()
temp_set1.add(gene[1][i])
temp_set2.add(gene[1][i + 1])
temp_list = []
temp_list.append(temp_set1)
temp_list.append('=')
temp_list.append(temp_set2)
status_list.append(temp_list)
elif not isupper(gene[1][i]) and isupper(gene[1][i + 1]):
temp_set1 = set()
temp_set2 = set()
temp_set1.add(gene[1][i])
temp_list = []
temp_list.append(temp_set1)
temp_list.append('<')
temp_list.append(firstVt_dict[gene[1][i + 1]])
# print('temp_list:',temp_list)
# print('status_list',status_list)
status_list.append(temp_list)
# print('status_list',status_list)
elif isupper(gene[1][i]) and not isupper(gene[1][i + 1]):
temp_set1 = set()
temp_set2 = set()
temp_set2.add(gene[1][i + 1])
temp_list = []
temp_list.append(lastVt_dict[gene[1][i]])
temp_list.append('>')
temp_list.append(temp_set2)
status_list.append(temp_list)
if len(gene[1]) >= 3:
for i in range(0,len(gene[1]) - 2):
# print(gene[1][i])
if not isupper(gene[1][i]) and isupper(gene[1][i + 1]) and not isupper(gene[1][i + 2]):
temp_set1 = set()
temp_set2 = set()
temp_set1.add(gene[1][i])
temp_set2.add(gene[1][i + 2])
temp_list = []
temp_list.append(temp_set1)
temp_list.append('=')
temp_list.append(temp_set2)
status_list.append(temp_list)
print('各终结符之间的优先关系：')
for status in status_list:
print(str(status))
return status_list
def has_Vt(gene: tuple)->bool:
"""#判断产生式的右部是否含有终结符"""
temp_vt_list = list(filter(lambda x: not isupper(x),gene[1]))
if temp_vt_list != []:
return True
else:
return False
def find_V(grammer_list: list) -> 'Vn_list,Vt_list':
"""找出文法中的所有非终结符和终结符"""
# 非终结符列表
Vn_list = []
Vn_set = set()
# 终结符列表
Vt_list = []
Vt_set = set()
# 所有符号的列表
total_list = []
for i in grammer_list:
# 将元组转为列表
temp_list = list(i)
# 将所有列表转为一个列表
total_list.extend(temp_list)
# 将列表转为字符串
total_str = ''.join(total_list)
# 将所有符号组成的字符串转为列表中的单个字符
for char in total_str:
# 筛选出字符列表中的终结符和非终结符
if isupper(char):
Vn_set.add(char)
else:
Vt_set.add(char)
Vn_list = list(Vn_set)
Vt_list = list(Vt_set)
print('Vn为：',Vn_list)
print('Vt为：', Vt_list)
return Vn_list,Vt_list
def cal_first(gene_list: list, Vn_list: list) -> 'first_dict':
"""计算每一个非终结符first集（字典结构）{'A': set{'abc'}，}"""
# 为所有的非终结符初始化first集
first_dict = {}
for Vn in Vn_list:
first_dict[Vn] = set()
while True:
# 记录每轮循环前的first集的大小
len_list1 = len_dict(first_dict)
# 遍历每一条产生式，计算first集
for gene in gene_list:
if gene[1] == '':
first_char = ''
else:
first_char = gene[1][0]
# print(first_char)
if first_char in Vt_list:
first_dict[gene[0]].add(first_char) # and len(gene[1]) == 1
elif first_char == '' and len(gene[1]) == 0:
first_dict[gene[0]].add('')
elif first_char in Vn_list:
# 找到产生式右部首个一定不为空的符号的位置
# 初始化为最后一个符号
not_null_index = len(gene[1]) - 1
for i in range(1, len(gene[1])):
v = gene[1][i]
# 首个Vn不能推出空，或者能推出空后面的首个Vt
if isupper(v) and '' not in first_dict[v] or islower(v):
not_null_index = i
break
# 计算该情况下的first集
for i in range(0, not_null_index + 1):
if islower(gene[1][i]):
first_dict[gene[0]].add(gene[1][i])
else:
for char in first_dict[gene[1][i]]:
if '' in first_dict[gene[1][i]]:
first_dict[gene[0]].add(char)
first_dict[gene[0]] -= {''}
else:
first_dict[gene[0]].add(char)
# 记录每轮循环后的first集的大小
len_list2 = len_dict(first_dict)
# 判断first是否增大，若全未增大，则循环结束
if len_list1 == len_list2:
break
print('first集为：', first_dict)
return first_dict
def cal_lastVt(gram_list: list,Vn_list,Vt_list) -> 'lastVt_dict':
"""计算每一个终结符的lastVt--{'a': {'abc''}}"""
# 初始化每一个终结符的lastVt集
lastVt_dict = {}
for v in Vn_list:
lastVt_dict[v] = set()
while True:
# 循坏开始前，记录每个非终结符的lastVt集的长度
len_list1 = len_dict(lastVt_dict)
for gene in gram_list:
# 产生式的右部含有终结符
if has_Vt(gene):
# 找出最后一个终结符
temp_list = list(filter(lambda x: not isupper(x), gene[1]))
last_vt = temp_list[len(temp_list) - 1]
lastVt_dict[gene[0]].add(last_vt)
# 产生式右部为空的情况
elif gene[1] == '':
pass
else:
# 产生式的右部不含终结符
# 找出最后一个非终结符
temp_list = list(filter(lambda x: isupper(x), gene[1]))
last_vn = temp_list[len(temp_list) - 1]
for char in lastVt_dict[last_vn]:
lastVt_dict[gene[0]].add(char)
# 循坏开始后，记录每个非终结符的lastVt集的长度
len_list2 = len_dict(lastVt_dict)
# 如果每个非终结符的lastVt集都没有再变化，则计算完毕
if len_list1 == len_list2:
break
print('lastVt集为:', lastVt_dict)
return lastVt_dict
def checkUpper(input):
if input == "Đ" or input == "Ư":
return True
else:
return isupper(input)
def FMMBMM(self,sentence):
sentence = self.standardlizeString(sentence)
vw = sentence.strip().split(' ')
n = len(vw)
q = []
strVWS = " |"
for i in range(0, n+1):
q.append('')
w = ''
vt1 = []
i = 0
j = 0
k = 0
a = []
for i in range(0, n+1):
a.append(0.0)
L = [[0]*(n + 1) for x in range(n + 1)]
for i in range(0,n+1):
for j in range(0,n+1):
L[i][j]=self.maxval
i = n - 1
while i >=0:
w = vw[i]
L[i][i+1] = 1.0
q[i+1] = w
if i >0:
k = i
for j in reversed(range(0, k)):
w = vw[j]+" "+w
if self.td.get(w.lower(),0) > 0:
L[j][k+1] = 1.0 /(k-j+1)
q[k+1]=w
i -= 1
a[0]=self.minval
for i in range(1, n+1):
for j in range(0, i):
w = vw[j]
if a[i] > (a[j] + L[j][i]):
a[i] = a[j]+ L[j][i]
for k in range(j+1, i):
w = w + " "+ vw[k]
q[i] = w
i = n
tpstrVWS=''
while i > 0:
vt1 = q[i].strip().split(' ')
strVWS = " | " + q[i] + strVWS
tpstrVWS = ' '+q[i].replace(' ','_') + tpstrVWS+' '
i = i - len(vt1)
ttp = tpstrVWS.strip().split()
listUpper = []
for index in range(0, len(ttp)):
if isupper(ttp[index][0]) and ttp[index].find('_') <0:
listUpper.append(index)
listreplace = []
dicDau = {}
for vv in group_consecutives(listUpper):
if len(vv) >= 2:
listreplace.append(vv)
for v in vv[:-1]:
dicDau[v]=1
result = ""
for i in range(0, len(ttp)):
result += ttp[i]+self.dau[dicDau.get(i,0)]
return result.strip()
def cal_follow(gene_list: list, Vn_list: list,
first_dict: dict) -> 'follow_dict':
"""计算每一个非终结符follow集（字典结构）{'A': set{'abc'}，}"""
# 为每一个非终结符初始化follow集,初始化开始符号的follow集为#
follow_dict = {}
for Vn in Vn_list:
follow_dict[Vn] = set()
follow_dict['S'].add('#')
while True:
len_list1 = len_dict(follow_dict)
# for Vn in Vn_list:
for gene in gene_list:
for i in range(0, len(gene[1])):
# 指定的非终结符后还有其他符号
if isupper(gene[1][i]) and i < len(gene[1]) - 1:
if islower(gene[1][i + 1]):
follow_dict[gene[1][i]].add(gene[1][i + 1])
else:
# 找到产生式右部的指定个非终结符后首个一定不为空的符号的位置
# 初始化为最后一个符号的位置
not_null_index = len(gene[1]) - 1
for j in range(i + 1, len(gene[1])):
v = gene[1][j]
# 首个Vn不能推出空，或者能推出空后面的首个Vt
if isupper(v) and '' not in first_dict[
v] or islower(v):
not_null_index = j
break
# 没找到产生式右部的指定个非终结符后首个一定不为空的符号
if isupper(gene[1]
[not_null_index]) and not_null_index == len(
gene[1]) - 1 and '' in first_dict[
gene[1][not_null_index]]:
for m in range(i + 1, not_null_index + 1):
for char in first_dict[gene[1][m]]:
follow_dict[gene[1][i]].add(char)
follow_dict[gene[1][i]] -= {''}
for char in follow_dict[gene[0]]:
follow_dict[gene[1][i]].add(char)
# 找到了产生式右部的指定的非终结符后首个一定不为空的符号
else:
# 计算该情况下的follow集
for n in range(i + 1, not_null_index + 1):
if islower(gene[1][n]):
follow_dict[gene[1][i]].add(gene[1][n])
else:
if '' in first_dict[gene[1][n]]:
for char in first_dict[gene[1][n]]:
follow_dict[gene[1][i]].add(char)
follow_dict[gene[1][i]] -= {''}
else:
for char in first_dict[gene[1][n]]:
follow_dict[gene[1][i]].add(char)
# 所求的非终结符位于产生式右部的最后一位
elif isupper(gene[1][i]) and i == len(gene[1]) - 1:
for char in follow_dict[gene[0]]:
follow_dict[gene[1][i]].add(char)
len_list2 = len_dict(follow_dict)
if len_list1 == len_list2:
break
print('follow集为：', follow_dict)
return follow_dict
