Commit b6e7c12a authored by tqcq's avatar tqcq
Browse files

feat use string_view

parent 26c643d0

src/sled/strings/utils.cc

+54 −0
Original line number Diff line number Diff line
@@ -32,6 +32,19 @@ ToUpper(sled::string_view str) 
    return ss.str();

}



std::string

ToHex(sled::string_view str)

{

    constexpr static char hex_chars[] = "0123456789ABCDEF";

    std::string result;

    result.reserve(str.size() * 2);

    for (auto &ch : str) {

        result.push_back(hex_chars[ch >> 4]);

        result.push_back(hex_chars[ch & 0x0F]);

    }

    return result;

}



std::string

StrJoin(const std::vector<std::string> &strings, const std::string &delim, bool skip_empty)

{
@@ -48,6 +61,47 @@ StrJoin(const std::vector<std::string> &strings, const std::string &delim, bool 
    return ss.str();

}



std::vector<std::string>

StrSplit(sled::string_view str, sled::string_view delim, bool skip_empty)

{

    if (str.empty() || delim.empty()) { return {}; }



    std::vector<std::string> result;



    size_t start    = 0;

    size_t next_pos = str.find_first_of(delim, start);

    while (next_pos != std::string::npos) {

        if ((!skip_empty && next_pos == start) || next_pos > start) {

            result.emplace_back(str.begin() + start, str.begin() + next_pos);

        }



        if (!skip_empty) {

            start    = next_pos + 1;

            next_pos = str.find_first_of(delim, start);

        } else {

            start = str.find_first_not_of(delim, next_pos);

            if (start == std::string::npos) {

                // all remaining characters are delimiters

                break;

            }

            next_pos = str.find_first_of(delim, start);

        }

    }



    if (start < str.size()) {

        result.emplace_back(str.substr(start));

    } else if (!skip_empty && !str.empty() && delim.find(str.back()) != std::string::npos) {

        result.emplace_back("");

    }

    return result;

}



std::vector<std::string>

StrSplit(sled::string_view str, char delim, bool skip_empty)

{

    return StrSplit(str, std::string(1, delim), skip_empty);

}



std::vector<std::string>

StrSplit(const std::string &str, const std::string &delim, bool skip_empty)

{

src/sled/strings/utils.h

+7 −2
Original line number Diff line number Diff line
@@ -13,9 +13,14 @@ char ToUpper(char c); 
// std::string ToUpper(const std::string &str);

std::string ToLower(sled::string_view str);

std::string ToUpper(sled::string_view str);

std::string ToHex(const std::string &str);

std::string ToHex(sled::string_view str);



std::string StrJoin(const std::vector<std::string> &strings, const std::string &delim, bool skip_empty = false);

std::vector<std::string> StrSplit(const std::string &str, const std::string &delim, bool skip_empty = false);

// std::vector<std::string> StrSplit(const std::string &str, const std::string &delim, bool skip_empty = false);



std::vector<std::string> StrSplit(sled::string_view str, sled::string_view delim, bool skip_empty = false);

std::vector<std::string> StrSplit(sled::string_view str, char delim, bool skip_empty = false);



std::string Trim(const std::string &str, const std::string &chars = " \t\n\r");

std::string TrimLeft(const std::string &str, const std::string &chars = " \t\n\r");

std::string TrimRight(const std::string &str, const std::string &chars = " \t\n\r");