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stringutils.h
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stringutils.h
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/**
* @file
* This file is part of UTILS
*
* @author Sebastian Rettenberger <[email protected]>
*
* @copyright Copyright (c) 2013-2016, Technische Universitaet Muenchen.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef UTILS_STRINGUTILS_H
#define UTILS_STRINGUTILS_H
#include <algorithm>
#include <functional>
#include <cctype>
#include <cstring>
#include <locale>
#include <sstream>
#include <string>
#include <vector>
/**
* A collection of useful utility functions
*/
namespace utils
{
/**
* A collection of useful string functions based on std::string
*/
class StringUtils
{
public:
/**
* Replaces first occurrence of from in str with to
*
* Taken from http://stackoverflow.com/questions/3418231/c-replace-part-of-a-string-with-another-string
*/
static bool replace(std::string& str, const std::string& from, const std::string& to) {
size_t start_pos = str.find(from);
if(start_pos == std::string::npos)
return false;
str.replace(start_pos, from.length(), to);
return true;
}
/**
* Replaces last occurrence of from in str with to
*/
static bool replaceLast(std::string& str, const std::string& from, const std::string& to) {
size_t start_pos = str.rfind(from);
if (start_pos == std::string::npos)
return false;
str.replace(start_pos, from.length(), to);
return true;
}
static bool startsWith(const std::string &str, const std::string &prefix)
{
return str.size() >= prefix.size() &&
str.compare(0, prefix.size(), prefix) == 0;
}
/**
* Checks a string for specific suffix
*
* Taken from: http://stackoverflow.com/questions/20446201/how-to-check-if-string-ends-with-txt
*/
static bool endsWith(const std::string &str, const std::string &suffix)
{
return str.size() >= suffix.size() &&
str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0;
}
/**
* Converts arbitrary datatypes (all datatypes which support the << stream
* operator) into std::string
*/
template<typename T>
static std::string toString(T value)
{
std::ostringstream ss;
ss << value;
return ss.str();
}
/**
* Converts strings to arbitrary datatypes (using the << stream operator)
*
* @param str The string that should be converted
*/
template<typename T>
static T parse(const std::string &str)
{
T result;
std::istringstream(str) >> result;
return result;
}
/**
* Converts strings to arbitrary datatypes
*
* @param str The string that should be converted
* @param advanced True of advanced conversions should be enabled
*/
template<typename T>
static T parse(const std::string &str, bool adavanced)
{
// By default the advanced mode is disabled for all datatypes
return parse<T>(str);
}
template<typename T> inline
static std::vector<T> parseArray(const std::string &str)
{
std::vector<T> elems;
std::istringstream f(str);
std::string s;
while (std::getline(f, s, ':'))
elems.push_back(parse<T>(s));
return elems;
}
/**
* Converts null terminated string to upper case
*/
static void toUpper(char* s)
{
for (size_t i = 0; s[i]; i++)
s[i] = toupper(s[i]);
}
/**
* Converts std::string to upper case
*/
static void toUpper(std::string &str)
{
for (size_t i = 0; str[i]; i++)
str[i] = toupper(str[i]);
}
/**
* Converts null terminated string to lower case
*/
static void toLower(char* s)
{
for (size_t i = 0; s[i]; i++)
s[i] = tolower(s[i]);
}
/**
* Converts std::string to lower case
*/
static void toLower(std::string &str)
{
for (size_t i = 0; str[i]; i++)
str[i] = tolower(str[i]);
}
/**
* Trims from start
*
* Taken from http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
*/
static std::string <rim(std::string &s) {
auto notSpace = [](unsigned char ch) { return !std::isspace(ch); };
s.erase(s.begin(), std::find_if(s.begin(), s.end(), notSpace));
return s;
}
/**
* Trims from end
*
* Taken from http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
*/
static std::string &rtrim(std::string &s) {
auto notSpace = [](unsigned char ch) { return !std::isspace(ch); };
s.erase(std::find_if(s.rbegin(), s.rend(), notSpace).base(), s.end());
return s;
}
/**
* Trims from both ends
*
* Taken from http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
*/
static std::string &trim(std::string &s) {
return ltrim(rtrim(s));
}
/**
* Join vector
*
* Taken from http://dracoater.blogspot.com/2010/03/joining-vector-and-splitting-string-in.html
*/
template<typename T>
static std::string join(const std::vector<T> &v, const std::string &token) {
std::ostringstream result;
for (typename std::vector<T>::const_iterator i = v.begin(); i != v.end(); i++){
if (i != v.begin())
result << token;
result << *i;
}
return result.str();
}
/**
* Split a string
*
* Taken from http://stackoverflow.com/questions/236129/how-to-split-a-string-in-c
*/
static std::vector<std::string> split(const std::string &str, char delim)
{
std::vector<std::string> elems;
std::stringstream ss(str);
std::string item;
while (getline(ss, item, delim))
elems.push_back(item);
return elems;
}
};
template<> inline
std::string StringUtils::parse(const std::string &str)
{
return str;
}
template<> inline
const char* StringUtils::parse(const std::string &str)
{
return str.c_str();
}
template<> inline
bool StringUtils::parse(const std::string &str, bool advanced)
{
std::string s = str;
toLower(s);
if (s == "on"
|| s == "yes")
return true;
return parse<bool>(str);
}
}
#endif /* UTILS_STRINGUTILS_H */