【C++实现python字符串函数库】strip、lstrip、rstrip方法
std::string do_strip(const std::string &str, int striptype, const std::string&chars) {std::string::size_type strlen = str.size();
std::string::size_type charslen = chars.size();
std::string::size_type i, j;
//默认情况下，去除空白符
if (0 == charslen)
{
i = 0;
//去掉左边空白字符
if (striptype != RIGHTSTRIP)
{
while (i < strlen&&::isspace(str))
{
i++;
}
}
j = strlen;
//去掉右边空白字符
if (striptype != LEFTSTRIP)
{
j--;
while (j >= i&&::isspace(str))
{
j--;
}
j++;
}
}
else
{
//把删除序列转为c字符串
const char*sep = chars.c_str();
i = 0;
if (striptype != RIGHTSTRIP)
{
//memchr函数：从sep指向的内存区域的前charslen个字节查找str
while (i < strlen&&memchr(sep, str, charslen))
{
i++;
}
}
j = strlen;
if (striptype != LEFTSTRIP)
{
j--;
while (j >= i&&memchr(sep, str, charslen))
{
j--;
}
j++;
}
//如果无需要删除的字符
if (0 == i&& j == strlen)
{
return str;
}
else
{
return str.substr(i, j - i);
}
}
}
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