string.cc

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#include "string.h"
#include <string>
#include <sstream>
#include <cstdio>
#include <cctype>

namespace tlz {

std::string file_name_extension(const std::string& filename) {
    std::ptrdiff_t pos = filename.find_last_of('.');
    if(pos == std::string::npos) return "";
    else return filename.substr(pos + 1);
}

std::vector<std::string> explode(char separator, const std::string& str) {
    std::vector<std::string> vec;
    std::string::size_type last_pos = 0;
    std::string::size_type pos = str.find(separator);
    while(pos != std::string::npos) {
        std::string::size_type n = pos - last_pos;
        std::string part = str.substr(last_pos, n);
        vec.push_back(part);
        last_pos = pos + 1;
        pos = str.find(separator, last_pos);
    }
    vec.push_back(str.substr(last_pos));
    return vec;
}


std::string implode(char separator, const std::vector<std::string>& vec) {
    std::ostringstream ostr;
    auto last = vec.end() - 1;
    for(auto it = vec.begin(); it != last; ++it) {
        ostr << *it << separator;
    }
    ostr << vec.back();
    return ostr.str();
}


std::string to_lower(const std::string& s_orig) {
    std::string s(s_orig);
    for(char& c: s) c = std::tolower(c);
    return s;
}


std::string to_upper(const std::string& s_orig) {
    std::string s(s_orig);
    for(char& c: s) c = std::toupper(c);
    return s;
}


std::string replace_all(const std::string& subject_orig, const std::string& find, const std::string& replace) {
    std::string subject = subject_orig;
    replace_all_inplace(subject, find, replace);
    return subject;
}


std::size_t replace_all_inplace(std::string& subject, const std::string& find, const std::string& replace) {
    std::size_t pos = 0;
    std::size_t count = 0;
    while( (pos = subject.find(find, pos)) != std::string::npos ) {
        subject.replace(pos, find.length(), replace);
        pos += replace.length();
        ++count;
    }
    return count;
}


int string_hash(const std::string& str) {
    int h = 0;
    for(char c : str) h += c;
    return h;
}

}