mirror of
https://github.com/CLIUtils/CLI11.git
synced 2025-04-29 20:23:55 +00:00
94 lines
2.3 KiB
C++
94 lines
2.3 KiB
C++
#pragma once
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// Distributed under the MIT license. See accompanying
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// file LICENSE or https://github.com/henryiii/CLI11 for details.
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#include <string>
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#include <sstream>
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#include <iomanip>
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#include <locale>
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#include <type_traits>
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#include <algorithm>
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namespace CLI {
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namespace detail {
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/// Simple function to join a string
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template <typename T>
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std::string join(const T& v, std::string delim = ",") {
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std::ostringstream s;
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size_t start = 0;
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for (const auto& i : v) {
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if(start++ > 0)
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s << delim;
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s << i;
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}
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return s.str();
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}
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// Based on http://stackoverflow.com/questions/25829143/c-trim-whitespace-from-a-string
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/// Trim whitespace from left of string
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std::string& ltrim(std::string &str) {
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auto it2 = std::find_if( str.begin() , str.end() , [](char ch){ return !std::isspace<char>(ch , std::locale::classic() ) ; } );
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str.erase( str.begin() , it2);
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return str;
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}
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/// Trim whitespace from right of string
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std::string& rtrim(std::string &str) {
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auto it1 = std::find_if( str.rbegin() , str.rend() , [](char ch){ return !std::isspace<char>(ch , std::locale::classic() ) ; } );
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str.erase( it1.base() , str.end() );
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return str;
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}
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/// Trim whitespace from string
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std::string& trim(std::string &str) {
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return ltrim(rtrim(str));
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}
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/// Make a copy of the string and then trim it
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std::string trim_copy(const std::string &str) {
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std::string s = str;
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return ltrim(rtrim(s));
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}
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/// Print a two part "help" string
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void format_help(std::stringstream &out, std::string name, std::string description, size_t wid) {
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name = " " + name;
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out << std::setw(wid) << std::left << name;
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if(description != "") {
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if(name.length()>=wid)
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out << std::endl << std::setw(wid) << "";
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out << description << std::endl;
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}
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}
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/// Verify the first character of an option
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template<typename T>
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bool valid_first_char(T c) {
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return std::isalpha(c) || c=='_';
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}
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/// Verify following characters of an option
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template<typename T>
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bool valid_later_char(T c) {
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return std::isalnum(c) || c=='_' || c=='.' || c=='-';
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}
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/// Verify an option name
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inline bool valid_name_string(const std::string &str) {
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if(str.size()<1 || !valid_first_char(str[0]))
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return false;
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for(auto c : str.substr(1))
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if(!valid_later_char(c))
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return false;
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return true;
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}
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}
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}
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