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book: formatting style updates (#231)

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ReEcho
2022-07-17 19:29:30 +08:00
committed by GitHub
parent 41b88c861e
commit e50e3c64f2
10 changed files with 104 additions and 74 deletions
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46
book/en-us/06-regex.md
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@@ -84,8 +84,9 @@ We use a simple example to briefly introduce the use of this library. Consider t
int main() {
std::string fnames[] = {"foo.txt", "bar.txt", "test", "a0.txt", "AAA.txt"};
// In C++, `\` will be used as an escape character in the string. In order for `\.`
// to be passed as a regular expression, it is necessary to perform second escaping of `\`, thus we have `\\.`
// In C++, `\` will be used as an escape character in the string.
// In order for `\.` to be passed as a regular expression,
// it is necessary to perform second escaping of `\`, thus we have `\\.`
std::regex txt_regex("[a-z]+\\.txt");
for (const auto &fname: fnames)
std::cout << fname << ": " << std::regex_match(fname, txt_regex) << std::endl;
@@ -104,7 +105,8 @@ std::smatch base_match;
for(const auto &fname: fnames) {
if (std::regex_match(fname, base_match, base_regex)) {
// the first element of std::smatch matches the entire string
// the second element of std::smatch matches the first expression with brackets
// the second element of std::smatch matches the first expression
// with brackets
if (base_match.size() == 2) {
std::string base = base_match[1].str();
std::cout << "sub-match[0]: " << base_match[0].str() << std::endl;
@@ -187,32 +189,36 @@ Please implement the member functions `start()` and `parse_request`. Enable serv
template<typename SERVER_TYPE>
void start_server(SERVER_TYPE &server) {
// process GET request for /match/[digit+numbers], e.g.
// GET request is /match/abc123, will return abc123
server.resource["fill_your_reg_ex"]["GET"] = [](ostream& response, Request& request) {
// process GET request for /match/[digit+numbers],
// e.g. GET request is /match/abc123, will return abc123
server.resource["fill_your_reg_ex"]["GET"] =
[](ostream& response, Request& request)
{
string number=request.path_match[1];
response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length()
<< "\r\n\r\n" << number;
};
// peocess default GET request; anonymous function will be called if no other matches
// response files in folder web/
// peocess default GET request;
// anonymous function will be called
// if no other matches response files in folder web/
// default: index.html
server.default_resource["fill_your_reg_ex"]["GET"] =
[](ostream& response, Request& request) {
string filename = "www/";
[](ostream& response, Request& request)
{
string filename = "www/";
string path = request.path_match[1];
string path = request.path_match[1];
// forbidden use `..` access content outside folder web/
size_t last_pos = path.rfind(".");
size_t current_pos = 0;
size_t pos;
while((pos=path.find('.', current_pos)) != string::npos && pos != last_pos) {
current_pos = pos;
path.erase(pos, 1);
last_pos--;
}
// forbidden use `..` access content outside folder web/
size_t last_pos = path.rfind(".");
size_t current_pos = 0;
size_t pos;
while((pos=path.find('.', current_pos)) != string::npos && pos != last_pos) {
current_pos = pos;
path.erase(pos, 1);
last_pos--;
}
// (...)
};