import re
"""
find 'return' statements in for or while loops
"""
# whether string contains for-loops or while-loops
def exist(string):
exist_for = string.find('for')
exist_while = string.find('while')
return [exist_for,exist_while][exist_for <= exist_while]
# get balanced for-loops or while loops in string
def get_balance_str(string):
index_start = exist(string)
if index_start < 0:
return
balance_arr = []
has_puted = False
index_end = -1
for i in range(len(string)):
if i < index_start:
continue
if string[i] == '{':
balance_arr.append(1)
has_puted = True
elif string[i] == '}':
balance_arr.pop()
if has_puted and len(balance_arr) == 0:
index_end = i+1
break
if index_end == -1:
raise ValueError('lack "{" or "}" in string')
print((index_start,index_end))
return string[index_start:index_end]
# find return statements in balanced for-loops or while-loops string
def get_return_str(balance_str):
return re.compile(r"return[^;]*;").findall(balance_str)
string = '''
public static main(string[] args){
while(1){
if(true){
return 11
&&7;
}else{
return 0;
}
}
if(!0){
return 'orz';
}
}
'''
print('source_str: \n\t%s' % string)
balance_str = get_balance_str(string)
print('balance_str: \n\t%s' % balance_str)
str_return = get_return_str(balance_str)
print('str_return: \n\t%s' % str_return)
