StringTools.hpp
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#pragma once
// Distributed under the 3-Clause BSD License. See accompanying
// file LICENSE or https://github.com/CLIUtils/CLI11 for details.
#include <algorithm>
#include <iomanip>
#include <locale>
#include <sstream>
#include <string>
#include <vector>
#include <type_traits>
namespace CLI {
namespace detail {
// Based on http://stackoverflow.com/questions/236129/split-a-string-in-c
/// Split a string by a delim
inline std::vector<std::string> split(const std::string &s, char delim) {
std::vector<std::string> elems;
// Check to see if empty string, give consistent result
if(s.empty())
elems.emplace_back("");
else {
std::stringstream ss;
ss.str(s);
std::string item;
while(std::getline(ss, item, delim)) {
elems.push_back(item);
}
}
return elems;
}
/// Simple function to join a string
template <typename T> std::string join(const T &v, std::string delim = ",") {
std::ostringstream s;
size_t start = 0;
for(const auto &i : v) {
if(start++ > 0)
s << delim;
s << i;
}
return s.str();
}
/// Join a string in reverse order
template <typename T> std::string rjoin(const T &v, std::string delim = ",") {
std::ostringstream s;
for(size_t start = 0; start < v.size(); start++) {
if(start > 0)
s << delim;
s << v[v.size() - start - 1];
}
return s.str();
}
// Based roughly on http://stackoverflow.com/questions/25829143/c-trim-whitespace-from-a-string
/// Trim whitespace from left of string
inline std::string <rim(std::string &str) {
auto it = std::find_if(str.begin(), str.end(), [](char ch) { return !std::isspace<char>(ch, std::locale()); });
str.erase(str.begin(), it);
return str;
}
/// Trim anything from left of string
inline std::string <rim(std::string &str, const std::string &filter) {
auto it = std::find_if(str.begin(), str.end(), [&filter](char ch) { return filter.find(ch) == std::string::npos; });
str.erase(str.begin(), it);
return str;
}
/// Trim whitespace from right of string
inline std::string &rtrim(std::string &str) {
auto it = std::find_if(str.rbegin(), str.rend(), [](char ch) { return !std::isspace<char>(ch, std::locale()); });
str.erase(it.base(), str.end());
return str;
}
/// Trim anything from right of string
inline std::string &rtrim(std::string &str, const std::string &filter) {
auto it =
std::find_if(str.rbegin(), str.rend(), [&filter](char ch) { return filter.find(ch) == std::string::npos; });
str.erase(it.base(), str.end());
return str;
}
/// Trim whitespace from string
inline std::string &trim(std::string &str) { return ltrim(rtrim(str)); }
/// Trim anything from string
inline std::string &trim(std::string &str, const std::string filter) { return ltrim(rtrim(str, filter), filter); }
/// Make a copy of the string and then trim it
inline std::string trim_copy(const std::string &str) {
std::string s = str;
return trim(s);
}
/// Make a copy of the string and then trim it, any filter string can be used (any char in string is filtered)
inline std::string trim_copy(const std::string &str, const std::string &filter) {
std::string s = str;
return trim(s, filter);
}
/// Print a two part "help" string
inline void format_help(std::stringstream &out, std::string name, std::string description, size_t wid) {
name = " " + name;
out << std::setw(static_cast<int>(wid)) << std::left << name;
if(!description.empty()) {
if(name.length() >= wid)
out << std::endl << std::setw(static_cast<int>(wid)) << "";
out << description;
}
out << std::endl;
}
/// Verify the first character of an option
template <typename T> bool valid_first_char(T c) { return std::isalpha(c, std::locale()) || c == '_'; }
/// Verify following characters of an option
template <typename T> bool valid_later_char(T c) {
return std::isalnum(c, std::locale()) || c == '_' || c == '.' || c == '-';
}
/// Verify an option name
inline bool valid_name_string(const std::string &str) {
if(str.empty() || !valid_first_char(str[0]))
return false;
for(auto c : str.substr(1))
if(!valid_later_char(c))
return false;
return true;
}
/// Return a lower case version of a string
inline std::string to_lower(std::string str) {
std::transform(std::begin(str), std::end(str), std::begin(str), [](const std::string::value_type &x) {
return std::tolower(x, std::locale());
});
return str;
}
/// Split a string '"one two" "three"' into 'one two', 'three'
inline std::vector<std::string> split_up(std::string str) {
std::vector<char> delims = {'\'', '\"'};
auto find_ws = [](char ch) { return std::isspace<char>(ch, std::locale()); };
trim(str);
std::vector<std::string> output;
while(!str.empty()) {
if(str[0] == '\'') {
auto end = str.find('\'', 1);
if(end != std::string::npos) {
output.push_back(str.substr(1, end - 1));
str = str.substr(end + 1);
} else {
output.push_back(str.substr(1));
str = "";
}
} else if(str[0] == '\"') {
auto end = str.find('\"', 1);
if(end != std::string::npos) {
output.push_back(str.substr(1, end - 1));
str = str.substr(end + 1);
} else {
output.push_back(str.substr(1));
str = "";
}
} else {
auto it = std::find_if(std::begin(str), std::end(str), find_ws);
if(it != std::end(str)) {
std::string value = std::string(str.begin(), it);
output.push_back(value);
str = std::string(it, str.end());
} else {
output.push_back(str);
str = "";
}
}
trim(str);
}
return output;
}
/// Add a leader to the beginning of all new lines (nothing is added
/// at the start of the first line). `"; "` would be for ini files
///
/// Can't use Regex, or this would be a subs.
inline std::string fix_newlines(std::string leader, std::string input) {
std::string::size_type n = 0;
while(n != std::string::npos && n < input.size()) {
n = input.find('\n', n);
if(n != std::string::npos) {
input = input.substr(0, n + 1) + leader + input.substr(n + 1);
n += leader.size();
}
}
return input;
}
} // namespace detail
} // namespace CLI